U.S. patent application number 16/849757 was filed with the patent office on 2020-08-27 for antibodies comprising modified heavy constant regions.
The applicant listed for this patent is BRISTOL-MYERS SQUIBB COMPANY. Invention is credited to Bryan C. BARNHART, Michelle Minhua HAN, Sandra V. HATCHER, Karla A. HENNING, Alan J. KORMAN, Ming LEI, Nils LONBERG, Arvind RAJPAL, Liang SCHWEIZER, Mark J. SELBY, Mohan SRINIVASAN, Aaron P. YAMNIUK.
Application Number | 20200268901 16/849757 |
Document ID | / |
Family ID | 1000004816332 |
Filed Date | 2020-08-27 |
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United States Patent
Application |
20200268901 |
Kind Code |
A1 |
LONBERG; Nils ; et
al. |
August 27, 2020 |
ANTIBODIES COMPRISING MODIFIED HEAVY CONSTANT REGIONS
Abstract
Provided herein are heavy chain constant regions (referred to as
"modified heavy chain constant regions"), or functionally
equivalent fragments thereof, that enhance biological properties of
antibodies relative to the same antibodies in unmodified form. An
exemplary modified heavy chain constant region includes an IgG2
hinge and three constant domains (i.e., CH1, CH2, and CH3 domains),
wherein one or more of the constant region domains are of a
non-IgG2 isotype (e.g., IgG1, IgG3 or IgG4). The heavy chain
constant region may comprise wildtype human IgG domain sequences,
or variants of these sequences. Also provided herein are methods
for enhancing certain biological properties of antibodies that
comprise a non-IgG2 hinge, such as internalization, agonism and
antagonism, wherein the method comprises replacing the non-IgG2
hinge of the antibody with an IgG2 hinge.
Inventors: |
LONBERG; Nils; (Woodside,
CA) ; KORMAN; Alan J.; (Piedmont, CA) ; SELBY;
Mark J.; (San Francisco, CA) ; BARNHART; Bryan
C.; (San Francisco, CA) ; YAMNIUK; Aaron P.;
(Lawrenceville, NJ) ; SRINIVASAN; Mohan;
(Cupertino, CA) ; HENNING; Karla A.; (Milpitas,
CA) ; HAN; Michelle Minhua; (Piedmont, CA) ;
LEI; Ming; (Princeton, NJ) ; SCHWEIZER; Liang;
(Lawrenceville, NJ) ; HATCHER; Sandra V.;
(Hillsborough, NJ) ; RAJPAL; Arvind; (San
Francisco, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
BRISTOL-MYERS SQUIBB COMPANY |
Princeton |
NJ |
US |
|
|
Family ID: |
1000004816332 |
Appl. No.: |
16/849757 |
Filed: |
April 15, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
15520954 |
Apr 21, 2017 |
10653791 |
|
|
PCT/US2015/061632 |
Nov 19, 2015 |
|
|
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16849757 |
|
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62083021 |
Nov 21, 2014 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C07K 2317/524 20130101;
C07K 2317/72 20130101; A61K 47/6803 20170801; C07K 16/2878
20130101; C07K 2317/77 20130101; C07K 16/2896 20130101; C07K
2317/53 20130101; C07K 2317/522 20130101; C07K 2317/92 20130101;
C07K 16/00 20130101; C07K 2317/75 20130101; C07K 2317/71 20130101;
C07K 16/30 20130101; A61K 39/3955 20130101 |
International
Class: |
A61K 47/68 20060101
A61K047/68; A61K 39/395 20060101 A61K039/395; C07K 16/00 20060101
C07K016/00; C07K 16/28 20060101 C07K016/28; C07K 16/30 20060101
C07K016/30 |
Claims
1. An antibody comprising a modified heavy chain constant region,
wherein the modified heavy chain constant region comprises a CH1
domain, a hinge, a CH2 domain, and a CH3 domain in order from N- to
C-terminus, wherein: (a) the hinge (i) is a wildtype human IgG2
hinge and comprises the amino acid substitution C219S, or (ii)
comprises an amino acid sequence that is at least 95% identical to
the amino acid sequence of a wildtype human IgG2 hinge and
comprises the amino acid substitution C219S; (b) the CH1 domain (i)
is a wildtype human IgG2 CH1 domain, or (ii) comprises an amino
acid sequence that is at least 95% identical to the amino acid
sequence of a wildtype human IgG2 CH1 domain; and (c) the CH2 and
CH3 domains (i) are wildtype human IgG1 CH2 and CH3 domains, or
(ii) comprise an amino acid sequence that is at least 95% identical
to the amino acid sequence of a wildtype human IgG1 CH2 and CH3
domains.
2. The antibody of claim 1, wherein the hinge comprises the amino
acid sequence of any one of SEQ ID NO: 21, 129 or 144.
3. The antibody of claim 1, wherein the IgG2 CH1 domain comprises
the amino acid sequence TABLE-US-00027 (SEQ ID NO: 7)
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGV
HTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKPSNTKVDKTV.
4. The antibody of claim 1, wherein the CH2 domain comprises one or
more modifications which reduces or eliminates effector
functions.
5. The antibody of claim 1, wherein the CH2 domain comprises amino
acid substitutions A330S and P331S.
6. The antibody of claim 13, wherein the CH2 domain comprises the
amino acid sequence TABLE-US-00028 (SEQ ID NO: 4)
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNA
KTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTIS KAK.
7. The antibody of claim 1, wherein the CH3 domain comprises the
amino acid sequence TABLE-US-00029 (SEQ ID NO: 5)
GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENN
YKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKS LSLSPGK.
8. The antibody of claim 1, wherein the CH3 domain comprises amino
acid substitutions E356D and M358L.
9. The antibody of claim 1, wherein the antibody comprises a
modified heavy chain constant region selected from the group of SEQ
ID NOs: 35, 37, 81, 84, 109, and 110.
10. The antibody of claim 1, which (i) binds specifically to a
costimulatory receptor; (ii) binds specifically to a cell surface
molecule and triggers antibody mediated internalization of the cell
surface molecule; (iii) binds specifically to an inhibitory
receptor; (iv) binds specifically to a cell surface molecule and
triggers intracellular signaling; (v) binds specifically to a cell
surface molecule and triggers formation of high molecular weight
antibody-cell surface molecule complexes; or (vi) binds
specifically to a cell surface molecule and triggers clustering or
oligomerization of the cell surface molecule.
11. The antibody of claim 10, wherein the costimulatory receptor is
GITR, OX40, 4-1BB, CD28, ICOS, CD40L, CD27 or any other TNFR
superfamily member; the cell surface molecule is CD73; the
inhibitory receptor is CTLA-4, PD-1, LAG-3, TIM-3, Galectin 9,
CEACAM-1, BTLA, CD69, Galectin-1, TIGIT, CD113, GPR56, VISTA, 2B4,
CD48, GARP, PD1H, LAIR1, TIM-1 and TIM-4; or the intracellular
signaling mediates agonist activity, antagonist activity,
internalization of the cell surface molecule, or ADCC.
12. The antibody of claim 10, wherein the antibody exhibits
enhanced or altered agonist activity relative to an antibody having
the same variable regions and light chain, but comprising an IgG1
heavy chain constant region; the antibody possesses enhanced or
altered internalization properties relative to an antibody having
the same variable regions and light chain, but comprising an IgG1
heavy chain constant region; the antibody exhibits more potent or
altered antagonist activity or introduces a new activity relative
to the same antibody having an IgG1 heavy chain constant region;
the antibody triggers more potent intracellular signaling relative
to an antibody having the same variable regions and light chain,
but comprising an IgG1 heavy chain constant region; the antibody
triggers formation of higher molecular weight complexes relative to
an antibody having the same variable regions and light chain, but
comprising an IgG1 heavy chain constant region; or the antibody
triggers more clustering or oligomerization of the cell surface
molecule relative to an antibody having the same variable regions
and light chain, but comprising an IgG1 heavy chain constant
region.
13. A bispecific molecule comprising the antibody of claim 1,
linked to a molecule having a second binding specificity.
14. An immunoconjugate comprising the antibody of claim 1, linked
to a second agent.
15. A composition comprising the antibody of claim 1, and a
carrier.
16. The composition of claim 15, further comprising one or more
additional therapeutic agents.
17. A method of treating a subject, comprising administering the
antibody of claim 1, wherein the subject is treated.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of U.S. application Ser.
No. 15/520,954, filed Apr. 21, 2017, which is a 35 U.S.C. 371
national stage filing of International Application No.
PCT/US2015/061632, filed Nov. 19, 2015, which claims priority to
U.S. Provisional Application No. 62/083,021, filed Nov. 21, 2014.
The contents of any patents, patent applications, and references
cited throughout this specification are hereby incorporated by
reference in their entireties.
SEQUENCE LISTING
[0002] The instant application contains a Sequence Listing which
has been submitted in ASCII format via EFS-Web, and is hereby
incorporated by reference in its entirety. Said ASCII copy, created
on Apr. 15, 2020, is named MXI-539USDV_Sequence_Listing.txt and is
328,791 bytes in size.
BACKGROUND
[0003] Antibody therapeutics is one of the fastest growing areas in
the treatment of disease, such as cancer and immune disorders.
Nevertheless, efficiently targeting an antigen by a therapeutic
antibody remains a major challenge in health care. Therefore,
antibody engineering has become a major focus in the pharmaceutical
world. From this focus, a myriad of new engineered antibodies have
emerged, such as antibody fragments, antibody drug conjugates
(ADCs), antibodies with modified effector regions, and bispecific
antibodies.
[0004] Antibodies facilitate their therapeutic properties through
many different mechanisms. Antibodies may directly inhibit or
activate a target antigen, thus regulating cell signaling.
Antibodies may inhibit the binding of a ligand to a receptor.
Antibodies may also induce or inhibit an immune response, for
example, by boosting the subject's immune system to fight infection
or cancer (e.g., as costimulators in the activation of T
cells).
[0005] Furthermore, antibody-mediated internalization of a cell
surface receptor/antigen is recognized as a major mechanism of
action for therapeutic antibodies. In this instance, an antibody
removes the target from the cell surface and from performing its
function by inducing internalization into the cell. Indeed, one of
the forerunners of antibody therapeutics is trastuzumab for the
treatment of breast cancer. Trastuzumab targets the ErbB2 receptor
and induces receptor/antibody internalization, thus inhibiting EGFR
signaling. However, antibodies do not always display efficient
internalization qualities, thus there is an ongoing need for
antibodies with improved internalization functions. Accordingly,
methods for improving the internalization of known therapeutic
antibodies are highly desirable.
SUMMARY
[0006] The invention provides heavy chain constant regions
(referred to as "modified heavy chain constant regions"), or
functionally equivalent fragments thereof, that enhance biological
properties of antibodies relative to the same antibodies in
unmodified form. For example, antibodies comprising such modified
constant regions exhibit increased internalization and/or agonistic
or antagonistic activity. Accordingly, antibodies of the invention
are optimized versions of the original unmodified antibody.
Specifically, the modified heavy chain constant region includes an
IgG2 hinge and three constant domains (i.e., CH1, CH2, and CH3
domains), wherein one or more of the constant region domains is a
non-IgG2 human isotype (e.g., IgG1, IgG3 or IgG4), or functionally
equivalent fragments thereof. The modified constant region can
include the corresponding wildtype amino acid sequence, or a
variant thereof, e.g., one or more (e.g., between 1-10, or more)
amino acid substitutions or deletions within the hinge or the CH1,
CH2, CH3 domains relative to the wildtype amino acid sequence.
Accordingly, the amino acid sequence of the hinge and/or each
constant domain is at least about 80%, 85%, 90%, 95%, or more
(i.e., 96%, 97%, 98%, 99%, or 100%) identical to the corresponding
wildtype amino acid sequence.
[0007] In one embodiment, the modified heavy chain constant region
includes a wildtype human IgG2 hinge, or an amino acid sequence
that is at least 95% identical to the amino acid sequence of a
wildtype human IgG2 hinge. The hinge can further contain additional
modifications, for example, to reduce disulfide bond formation. In
one embodiment, the hinge includes the amino acid substitution
C219S, relative to the wildtype human IgG2 hinge. In certain
embodiments, the hinge comprises the amino acid sequence set forth
in any of SEQ ID NO: 8, 21-23, 126-132 and 134-147 or one of these
sequences that comprises 1-3 amino acids inserted between CVE and
CPP.
[0008] In certain embodiments, the modified heavy chain constant
region includes an IgG2 CH1 domain, e.g., a wildtype human IgG2 CH1
domain, or an amino acid sequence that is at least 95% identical to
the amino acid sequence of a wildtype human IgG2 CH1 domain (SEQ ID
NO: 7).
[0009] In certain embodiments, the modified heavy chain constant
region includes an IgG1 CH2 domain, e.g., a wildtype human IgG1 CH2
domain, or an amino acid sequence that is at least 95% identical to
the amino acid sequence of a wildtype human IgG1 CH2 domain. The
CH2 domain may contain additional modifications (e.g., to reduce or
eliminate effector functions). In certain embodiments, the CH2
domain comprises the amino acid substitutions A330S and P331S,
relative to wildtype full-length human IgG1 CH2. In certain
embodiments, the CH2 domain comprises SEQ ID NO: 24.
[0010] In certain embodiments, the modified heavy chain constant
region includes an IgG1 CH3 domain, e.g., a wildtype human IgG1 CH3
domain, or an amino acid sequence that is at least 95% identical to
the amino acid sequence of a wildtype human IgG1 CH3 domain. The
CH3 domain can further contain additional modifications to confer a
particular allotype. In one embodiment, the CH3 domain contains the
amino acid residue E at position 356 and the amino acid M at
position 358, relative to wildtype full-length human IgG1 of a
different allotype. In certain embodiments, the CH3 domain
comprises SEQ ID NO: 5.
[0011] In a particular embodiment, the antibody comprises a
modified heavy chain constant region wherein (a) the CH1 domain is
a wildtype human IgG2 CH1 domain or a wildtype IgG1 CH1 domain,
with or without additional modification, (b) the hinge is a
wildtype IgG2 hinge with or without a C219S substitution, (c) the
CH2 domain is a wildtype human IgG1 CH2 domain or a wildtype IgG2
CH2 domain, with or without additional modifications, and (d) the
CH3 domain is a wildtype human IgG1 CH3 domain or a wildtype human
IgG2 CH3 domain, with or without amino acid E at position 356 and
amino acid M at position 358. In a specific embodiment, the
modified heavy chain constant region comprises an amino acid
sequence described herein, e.g., set forth in any one of SEQ ID
NOs: 26-37 and 78-93.
[0012] Antibodies of the invention (i.e., antibodies having a
modified constant region) may be fully human antibodies or
humanized antibodies, and further exhibit one or more enhanced or
altered features, compared to the same antibodies without a
modified heavy chain constant region. These features may include
increased or altered internalization by a cell, agonistic activity,
formation of large cross-linked complexes, ADCC, receptor mediated
signaling, antagonist activity, immuno-modulating activity and
anti-tumor activity; or introduction of a new property, e.g.,
agonist activity.
[0013] Bispecific molecules and immunoconjugates containing
modified constant regions of the invention are also provided, as
well as compositions which contain the antibodies, bispecifics, or
immunoconjugates and an acceptable pharmaceutical carrier. Such
compositions also may include one or more additional therapeutic
agents, e.g., an agent that stimulates the immune system, such as a
checkpoint inhibitor, a co-stimulatory molecule, an anti-CD39
antibody, or an anti-A2AR antibody.
[0014] Methods for preparing an antibody comprising a modified
heavy chain constant region are also provided. Certain methods
provided herein include methods of increasing internalization of an
antibody by a cell, and methods for increasing the agonist activity
of an antibody, compared to the same antibody comprising a hinge of
a non-IgG2 isotype. Such methods comprise the steps of providing an
antibody having a hinge that is not an IgG2 hinge, and replacing
the hinge with an IgG2 hinge (such as a hinge that is a wildtype
human IgG2 hinge, a hinge having an amino acid sequence that is at
least 95% identical to the amino acid sequence of a wildtype human
IgG2 hinge, or a hinge that is modified to reduce disulfide bond
formation, e.g., a hinge that comprises amino acid substitution
C219S). In one embodiment, internalization of the antibody is
enhanced or increased by at least 10%, 30%, 50%, 75%, 2 fold, 3
fold, 5 fold or more, resulting in a reduction of the T.sub.1/2 by
at least 10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more. In
certain embodiments, agonist activity is increased or enhanced by
at least 10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more as
defined by increased cytokine release or increased proliferation in
effector T cells; reduced T regulatory cell activity if engagement
on Tregs reduces Treg function; or increased depletion of
Tregs.
[0015] In certain embodiments, the method further includes the step
of replacing at least one of the CH1, CH2, or CH3 domains with a
CH1, CH2, or CH3 domain of a different isotype. Such replacements
include, for example: (a) replacing the CH1 domain with an IgG1 CH1
domain or an IgG2 CH1 domain; (b) replacing the CH2 domain with an
IgG1 CH2 domain or an IgG2 CH2 domain; and/or (b) replacing the CH3
domain with an IgG1 CH3 domain or an IgG2 CH3 domain, wherein the
replacement domain has the wildtype sequence or at least 95%
identity the wildtype sequence. In certain embodiments, the CH1
domain comprises the amino acid sequence as set forth in SEQ ID NO:
7. In certain embodiments, the CH2 domain is modified to reduce or
eliminate effector functions, e.g., the CH2 domain comprises amino
acid substitutions A330S and P331S (SEQ ID NO:24). In certain
embodiments, the CH3 domain comprises the amino acid residue E at
position 356 and the amino acid M at position 358 (SEQ ID NO:
5).
[0016] Methods provided herein include methods of treating a
subject by administering an antibody, bispecific molecule or
immunoconjugate comprising a modified heavy chain constant region.
One or more additional therapeutic agents, e.g., a therapeutic
agent that stimulates the immune system, such as a checkpoint
inhibitor, a co-stimulatory molecule also can be
co-administered.
[0017] Provided herein are antibodies comprising a modified heavy
chain constant region comprising a CH1 domain, a hinge, a CH2
domain, and a CH3 domain in order from N- to C-terminus, and
wherein (a) the CH1 domain comprises the amino acid sequence of SEQ
ID NO: 7 or an amino acid sequence that differs therefrom in at
most 5 amino acids or which is at least 95% identical to SEQ ID NO:
7, and wherein at least one of C131, R133, E137, S138 or R217 are
not substituted or deleted; (b) a hinge comprising any one of SEQ
ID NO: 8, 21-23, 126-132 or 134-147 or a sequence that comprises
1-3 amino acids inserted between CVE and CPP, or which differs
therefrom in at most 5 amino acids, wherein the hinge does not
comprise a substitution or deletion at both C219 and C220; (c) the
antibody has at least one enhanced property or a new introduced
property relative to the same antibody that comprises an IgG1 hinge
and CH1 domain; and (d) the modified heavy chain constant region is
not a wildtype IgG2 constant region or an IgG2 constant region
comprising C219S and/or C220S. The hinge may comprise the amino
acid sequence ERKXCVECPPCPAP (SEQ ID NO: 129) or ERKCXVECPPCPAP
(SEQ ID NO: 130), wherein X is any amino acid except cysteine. For
example, the hinge may comprise the amino acid sequence
ERKSCVECPPCPAP (SEQ ID NO: 131) or ERKCSVECPPCPAP (SEQ ID NO: 132).
In certain embodiments at least one of, or all of, amino acid
residues P233, V234, A235 and G237 are deleted or substituted with
another amino acid residue, e.g., the corresponding amino acid in
an IgG1 hinge. In certain embodiments, none of amino acid residues
R133, E137, S138 and R217 or none of C131, R133, E137, S138 and
R217 are substituted or deleted. In certain embodiments, N192
and/or F193 are substituted with another amino acid. The antibody
may comprise a CH2 domain that is at least 95% identical to that of
wildtype IgG1. The antibody may comprise a CH3 domain that is at
least 95% identical to that of wildtype IgG1. In certain
embodiments, the CH2 and/or CH3 domain is not a wildtype IgG1 CH2
and/or CH3 domain, and the antibody has an effector function that
is more potent than that of wildtype IgG1. In certain embodiments,
the CH2 and/or CH3 domain is not a wildtype IgG1 CH2 and/or CH3
domain, and the antibody has an effector function that less potent
than that of wildtype IgG1. In certain embodiments, the antibody
comprises a CH2 domain and/or CH1 domain that is at least 95%
identical to that of wildtype IgG1 or IgG4. In certain embodiments,
the antibody has at least one enhanced property selected from
agonist activity, antibody mediated receptor internalization, ADCC,
receptor mediated signaling, antagonist activity, immuno-modulating
activity or anti-tumor activity; or a newly introduced property,
which is agonist activity.
[0018] In certain embodiments, an antibody comprises a modified
heavy chain constant region, wherein (a) the CH1 domain is a
wildtype human IgG2 CH1 domain; (b) the hinge comprises SEQ ID NO:
any one of SEQ ID NO: 8, 21-23, 126-132 or 134-147 or a sequence
that comprises 1-3 amino acids inserted between CVE and CPP; (c)
the CH2 domain is a wildtype human IgG1 CH2 domain or a modified
CH2 domain conferring enhanced or reduced effector function to the
antibody; and (d) the CH3 domain is a wildtype human IgG1 CH3
domain or a modified CH3 domain conferring enhanced or reduced
effector function to the antibody. A modified heavy chain constant
domain may comprise the amino acid sequence set forth in any one of
SEQ ID NOs: 26-37, 54-56, 78-125 and 152-168, or an amino acid
sequence that is at least 95% identical to SEQ ID NOs: 26-37,
54-56, 78-125 and 152-168.
[0019] In certain embodiments, an antibody comprises a modified
heavy chain constant region, wherein the heavy chain constant
region comprises a CH1 domain and a hinge comprising the
sequence
TABLE-US-00001 (SEQ ID NO: 133)
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGV
HTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKPSNTKVDKTVER
KCCVECPPCPAPPVAG,
or an amino acid sequence that differs from SEQ ID NO: 133 in at
most 10 acids or is at least 90% identical to SEQ ID NO: 133,
wherein (i) at least one of C131, R133, E137, S138 and R217 is not
substituted with another amino acid or deleted; (ii) C219 and C220
may be substituted with another amino acid or deleted, but C219 and
C220 may not both be substituted or deleted; (iii) 1-3 amino acids
may be inserted between CVE and CPP in the hinge; (iv) the hinge
optionally comprises an additional amino acid at the C-terminus,
e.g., G; (v) one or more of amino acids P233, V234, A235 and G237
may be substituted with another amino acid (e.g., the corresponding
amino acid from IgG1) or deleted; (vi) the CH2 and CH3 domains may
be wildtype or modified IgG1, IgG2, IgG3 or IgG4 CH2 and CH3
domains; (vii) the modified heavy chain constant region is not a
wildtype IgG2 heavy chain constant region or a wildtype IgG2 heavy
constant domain with C219S or C220S; and (viii) the antibody has at
least one enhanced property or a new introduced property relative
to the same antibody that comprises an IgG1 hinge and CH1 domain.
In certain embodiments, the antibody has at least one enhanced
property selected from agonist activity, antibody mediated receptor
internalization, ADCC, receptor mediated signaling, antagonist
activity, immuno-modulating activity or anti-tumor activity; or a
newly introduced property, which is agonist activity. In certain
embodiments, none of amino acids C131; R133; E137; S138; R217 are
substituted with another amino acid or deleted. In certain
embodiments, N192 and/or F193 are not substituted or are N192S
and/or F193L, respectively. In certain embodiments, C219 is C219S,
C220 is C220S, P233-G237 are substituted or deleted; V234-G237 are
substituted or deleted; A235-G237 are substituted or deleted; G237
is substituted or deleted; P233 is substituted or deleted;
P233-V234 are substituted or deleted; or P233-A235 are substituted
or deleted. The antibody may have effector function, or be deprived
of effector function. The antibody may comprise a wildtype or
modified IgG1 CH2 domain and or a wildtype or modified IgG1 CH3
domain.
[0020] In certain embodiments, an antibody comprises a modified
heavy chain constant region, wherein the heavy chain constant
region comprises a CH1 domain comprising the sequence
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSS
GLYSLSSVVTVPSSNFGTQTYTCNVDHKPSNTKVDKTVE (SEQ ID NO: 7), or an amino
acid sequence that differs from SEQ ID NO: 7 in at most 10 amino
acids or is at least 90% identical to SEQ ID NO: 7, wherein (i) at
least one of C131, R133, E137, S138 and R217 is not substituted or
deleted; (ii) the modified heavy chain constant region is not a
wildtype IgG2 heavy chain constant region or a wildtype IgG2 heavy
constant domain with C219S or C220S; and (iii) the antibody has at
least one enhanced property or a new introduced property relative
to the same antibody that comprises an IgG1 hinge and CH1 domain.
The antibody may have at least one enhanced property selected from
agonist activity, antibody mediated receptor internalization, ADCC,
receptor mediated signaling, antagonist activity, immuno-modulating
activity or anti-tumor activity; or a newly introduced property,
which is agonist activity. In certain embodiments, none of amino
acids C131; R133; E137 and S138 are substituted with another amino
acid or deleted. In certain embodiments, N192 and/or F193 are not
substituted or are N192S and/or F193L, respectively. The antibody
may have effector function, or be deprived of effector function.
The antibody may comprise a wildtype or modified IgG1 CH2 domain
and or a wildtype or modified IgG1 CH3 domain.
[0021] An antibody may comprise a modified heavy chain constant
region, wherein the heavy chain constant region comprises a hinge
comprising the sequence
TABLE-US-00002 (SEQ ID NO: 8) ERKCCVECPPCPAPPVAG,
or an amino acid sequence that differs from SEQ ID NO: 8 in at most
5 amino acids, wherein (i) C219 and C220 may be substituted with
another amino acid or deleted, but C219 and C220 may not both be
substituted or deleted; (ii) one or more of amino acids P233, V234,
A235 and G237 may be substituted or deleted; (iii) 1-3 amino acids
may be inserted between CVE and CPP in the hinge; (iv) the hinge
optionally comprises an additional amino acid at the C-terminus,
e.g., G; (v) the CH2 and CH3 domains may be wildtype or modified
IgG1, IgG2, IgG3 or IgG4 CH2 and CH3 domains; (vi) the modified
heavy chain constant region is not a wildtype IgG2 heavy chain
constant region or a wildtype IgG2 heavy constant domain with C219S
or C220S; and (vii) the antibody has at least one enhanced property
or a new introduced property relative to the same antibody that
comprises an IgG1 hinge and CH1 domain. The antibody may have at
least one enhanced property selected from agonist activity,
antibody mediated receptor internalization, ADCC, receptor mediated
signaling, antagonist activity, immuno-modulating activity or
anti-tumor activity; or a newly introduced property, which is
agonist activity. In certain embodiments, C219 is C219S, C220 is
C220S, P233-G237 are substituted or deleted; V234-G237 are
substituted or deleted; A235-G237 are substituted or deleted; G237
is substituted or deleted; P233 is substituted or deleted;
P233-V234 are substituted or deleted; or P233-A235 are substituted
or deleted. The antibody may have effector function, or be deprived
of effector function. The antibody may comprise a wildtype or
modified IgG1 CH2 domain and or a wildtype or modified IgG1 CH3
domain.
[0022] Also provided are antibodies comprising a modified heavy
chain constant region, wherein the heavy chain constant region
comprises an IgG1 or IgG2 hinge, and wherein the hinge is lacking
1-7 amino acids, and wherein the antibody has at least one enhanced
property or a new introduced property relative to the same antibody
that comprises an IgG1 hinge and CH1 domain. The antibody may have
at least one enhanced property selected from agonist activity,
antibody mediated receptor internalization, ADCC, receptor mediated
signaling, antagonist activity, immuno-modulating activity or
anti-tumor activity; or a newly introduced property, which is
agonist activity. The hinge may be an IgG2 hinge that is lacking
1-4 amino acids, e.g., amino acids C219, C220, V222 and E224. The
hinge is an IgG1 hinge that is lacking amino acids S219, C220,
D221, K222, T223, H224 and T225. The antibody may comprise an IgG2
CH1 domain that is wildtype or modified; an IgG1 CH1 domain that is
wildtype or modified, and an IgG1, IgG2 or IgG4 CH2 domain and an
IgG1, IgG2 or IgG4 CH3 domain.
[0023] Antibodies with modified heavy chain constant regions may be
human or humanized antibodies, or antigen binding portions thereof.
In certain embodiments, the antibody binds specifically to an
antigen that is involved in immune regulation. The antibody may be
an agonist of a costimulatory receptor or an antagonist of an
inhibitory receptor. For example, the antibody may bind to a
costimulatory receptor, e.g., selected from the group of B7-1,
B7-2, CD28, 4-1BB, GITR, OX40, ICOS, CD70, CD27, CD40, DR3 or
CD28H, or the antibody may bind to an inhibitory receptor, e.g.,
selected from the group of CTLA-4, PD-1, PD-L1, PD-L2, LAG-3,
TIM-3, Galectin 9, CEACAM-1, BTLA, CD69, Galectin-1, TIGIT, CD113,
GPR56, VISTA, 2B4, CD48, GARP, PD1H, LAIR1, TIM-1 and TIM-4. The
antigen may be an antigen that is required to be internalized,
e.g., CD73. The antigen may be CD39.
[0024] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds specifically to a costimulatory
receptor, e.g., GITR, OX40, 4-1BB, CD28, ICOS, CD40, CD27 or any
other TNFR superfamily member, and comprises a modified heavy chain
constant region selected from the group of SEQ ID NOs: 26-37,
54-56, 78-125 and 152-168. In certain embodiments, the antibody
exhibits enhanced or altered agonist activity relative to an
antibody having the same variable regions and light chain, but
comprising an IgG1 heavy chain constant region.
[0025] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds specifically to a cell surface
molecule, e.g., CD73, and triggers antibody mediated
internalization of the cell surface molecule, and comprises a
modified heavy chain constant region selected from the group of SEQ
ID NOs: 26-37, 54-56, 78-125 and 152-168. In certain embodiments,
the antibody possesses enhanced or altered internalization
properties relative to an antibody having the same variable regions
and light chain, but comprising an IgG1 heavy chain constant
region.
[0026] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds specifically to an inhibitory
receptor, e.g., CTLA-4, PD-1, LAG-3, TIM-3, Galectin 9, CEACAM-1,
BTLA, CD69, Galectin-1, TIGIT, CD113, GPR56, VISTA, 2B4, CD48,
GARP, PD1H, LAIR1, TIM-1 and TIM-4, and comprises a modified heavy
chain constant region selected from the group of SEQ ID NOs: 26-37,
54-56, 78-125 and 152-168. In certain embodiments, the antibody
exhibits more potent or altered antagonist activity or introduces a
new activity relative to the same antibody having an IgG1 heavy
chain constant region.
[0027] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds specifically to a cell surface
molecule and triggers intracellular signaling, wherein the antibody
comprises a modified heavy chain constant region selected from the
group of SEQ ID NOs: 26-37, 54-56, 78-125 and 152-168. In certain
embodiments, intracellular signaling mediates agonist activity,
antagonist activity, internalization of the cell surface molecule,
or ADCC. In certain embodiments, the antibody triggers more potent
intracellular signaling relative to an antibody having the same
variable regions and light chain, but comprising an IgG1 heavy
chain constant region.
[0028] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds specifically to a cell surface
molecule and triggers formation of high molecular weight
antibody-cell surface molecule complexes, wherein the antibody
comprises a modified heavy chain constant region selected from the
group of SEQ ID NOs: 26-37, 54-56, 78-125 and 152-168. In certain
embodiments, the antibody triggers formation of higher molecular
weight complexes relative to an antibody having the same variable
regions and light chain, but comprising an IgG1 heavy chain
constant region.
[0029] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds specifically to a cell surface
molecule and triggers clustering or oligomerization of the cell
surface molecule, wherein the antibody comprises a modified heavy
chain constant region selected from the group of SEQ ID NOs: 26-37,
54-56, 78-125 and 152-168. In certain embodiments, the antibody
triggers more clustering or oligomerization of the cell surface
molecule relative to an antibody having the same variable regions
and light chain, but comprising an IgG1 heavy chain constant
region.
[0030] Also provided herein are bispecific molecule comprising an
antibody comprising a modified heavy chain constant region linked
to a molecule having a second binding specificity. Also provided
herein are immunoconjugates comprising an antibody comprising a
modified heavy chain constant region, linked to a second agent.
Composition comprising an antibody, bispecific or immunoconjugate
described herein and a carrier are also provided. Compositions may
comprise one or more additional therapeutic agents, e.g., a
therapeutic agent stimulates the immune system, and is, e.g., an
antagonist of a checkpoint inhibitor or a co-stimulatory
receptor.
[0031] Also provided herein are methods of preparing an antibody
comprising a modified heavy chain constant region, wherein the
antibody comprises a CH1 domain, a hinge, a CH2 domain, and a CH3
domain in order from N- to C-terminus, comprising the steps of: (a)
providing an antibody comprising a hinge and/or a CH1 domain that
is not an IgG2 hinge and/or IgG2 CH1 domain; and (b) replacing the
hinge and/or the CH1 domain with an IgG2 hinge and/or IgG2 CH1
domain, respectively. Further provided herein are methods of
increasing internalization of an antibody by a cell, comprising:
(a) providing an antibody comprising a hinge and/or a CH1 domain
that is not an IgG2 hinge and/or IgG2 CH1 domain; and (b) replacing
the hinge and/or the CH1 domain with an IgG2 hinge and/or IgG2 CH1
domain, respectively. Internalization of the antibody may be
increased compared to internalization of the same antibody
comprising a hinge of a non-IgG2 isotype, e.g., an antibody
comprising an IgG1 constant region. Also provided are methods of
increasing the agonist activity of an antibody, comprising: (a)
providing an antibody comprising a hinge and/or a CH1 domain that
is not an IgG2 hinge and/or IgG2 CH1 domain; and (b) replacing the
hinge and/or the CH1 domain with an IgG2 hinge and/or IgG2 CH1
domain, respectively. The agonist activity may be increased
compared to agonist activity of the same antibody comprising a
hinge of a non-IgG2 isotype, e.g., an antibody comprising an IgG1
constant region. An IgG2 hinge may be a wildtype human IgG2 hinge,
or comprises an amino acid sequence that is at least 95% identical
to the amino acid sequence of a wildtype human IgG2 hinge and may
comprise, e.g., a sequence set forth in Table 4. A method may
comprise the step of replacing at least one of the CH1, CH2, or CH3
domains with a CH1, CH2, or CH3 domain of a different isotype,
respectively. A method may comprise the steps of (a) replacing the
CH1 domain with an IgG2 CH1 domain; (b) replacing the CH2 domain
with an IgG1 CH2 domain; and/or (b) replacing the CH3 domain with
an IgG1 CH3 domain. A method may comprise the steps of (a)
replacing the CH1 domain with a wildtype human IgG2 CH1 domain, or
a domain at least 95% identical thereto; (b) replacing the CH2
domain with a wildtype human IgG1 CH2 domain, or a domain at least
95% identical thereto; and/or (b) replacing the CH3 domain with a
wildtype human IgG1 CH3 domain, or a domain at least 95% identical
thereto. A method may comprise the step of replacing the heavy
chain constant region with a modified heavy chain constant region
comprising any one of SEQ ID NOs: 26-37, 54-56, 78-125 and 152-168
or a region at least 95% identical to SEQ ID NOs: 26-37, 54-56,
78-125 and 152-168. The hinge may be modified to reduce or alter
disulfide bond formation. The hinge may comprise amino acid
substitution C219S. The hinge may comprise an amino acid sequence
set forth in any one of SEQ ID NO: 8, 21-23, 126-132 or 134-147 or
a sequence that comprises 1-3 amino acids inserted between CVE and
CPP. The CH1 domain may comprise the amino acid sequence
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSS
GLYSLSSVVTVPSSNFGTQTYTCNVDHKPSNTKVDKTV (SEQ ID NO: 7). The CH2
domain may be modified to reduce or eliminate effector functions.
The CH2 domain may comprise amino acid substitutions A330S and
P331S. The CH2 domain may comprise the amino acid sequence
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREEQY
NSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAK (SEQ ID NO: 4). The
CH2 domain may comprise amino acid substitutions A330S and P331S.
The CH3 domain may comprise the amino acid sequence
TABLE-US-00003 (SEQ ID NO: 5)
GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENN
YKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKS LSLSPGK.
[0032] Also provided are antibodies, or antigen binding portion
thereof, produced by the methods described herein, e.g., set forth
above, e.g., human or humanized antibodies. Methods of treating a
subject, e.g., a subject having cancer, with any of the antibodies
described herein are also encompassed herein. The methods may
comprise administering one or more additional therapeutic agents,
e.g., therapeutic agents that stimulate the immune system. For
example, a therapeutic agent may target a checkpoint inhibitor or a
co-stimulatory molecule. Methods may include administering a
composition, bispecific molecule, or immunoconjugate described
herein.
BRIEF DESCRIPTION OF THE DRAWINGS
[0033] FIG. 1A shows the kinetics of antibody mediated
internalization of CD73 in H2228 cells (non-small cell lung
carcinoma cell line) by the following antibodies: 11F11, 4C3, 6D11,
CD73.3-IgG1. f with the 4C3Vk1 light chain
("3-Vh-hHC-IgG1.1f/4C3Vk1"), CD73.4-IgG2CS with the 11F11 Vk2 light
chain ("4-Vh-hHC-IgG2-C219S/11F11-Vk2"), CD73.10-IgG2CS
("CD73.10-Vh-hHC-IgG2-C219S"), CD73.10-IgG2CS-IgG1.1f
("CD73.10-Vh-hHC-IgG2-C219S-IgG1.1f"), and CD73.10-IgG1.1f
("CD73.10-Vh-hHC-IgG1.1f") antibodies in H2228 cells. The 11F11
(which is of an IgG2 isotype), CD73.4-IgG2CS, CD73.10-IgG2CS and
CD73.10-IgG2CS-IgG1.1f antibodies are internalized faster and to a
higher degree than the other tested antibodies, which are of an
IgG1 isotype.
[0034] FIG. 1B shows the kinetics of antibody mediated CD73
internalization of the same antibodies as those shown in FIG. 1A in
HCC15 cells (non-small cell lung carcinoma cell line), showing
similar results to those obtained in H2228 cells.
[0035] FIG. 1C shows the kinetics of antibody mediated CD73
internalization of the same antibodies as those shown in FIGS. 1A
and 1B, as well as CD73.11-IgG2CS ("11-Vh-hVC-IgG2-C219S"), in
Calu6 cells, showing similar results to those obtained in H2228 and
HCC15 cells.
[0036] FIG. 1D shows the kinetics of antibody mediated CD73
internalization of the same antibodies as those shown in FIG. 1C in
NCI-2030 cells (non-small cell lung carcinoma cell line), showing
similar results to those obtained in H2228, HCC15, and Calu6
cells.
[0037] FIG. 1E shows the kinetics of antibody mediated CD73
internalization of the indicated antibodies in Calu6 cells, as
measured by flow cytometry.
[0038] FIG. 1F shows the kinetics of antibody mediated CD73
internalization of the indicated antibodies in NCI-H292 cells
(mucoepidermoid pulmonary carcinoma cell line), as measured by flow
cytometry, but where the antibodies were not washed out after the
first incubation of the cells with the antibodies.
[0039] FIG. 1G shows the percentage of CD73 internalized in Calu6
cells treated with the indicated antibodies, showing antibody
mediated CD73 internalization of the indicated antibodies in Calu6
cells over time.
[0040] FIG. 1H shows the percentage of CD73 internalized in
NCI-H292 cells treated with the indicated antibodies over time,
showing antibody mediated CD73 internalization of the indicated
antibodies in NCI-H292 cells over time.
[0041] FIG. I1 shows the percentage of CD73 internalized in SNU-C1
cells (colon carcinoma cell line) treated with the indicated
antibodies over time, showing antibody mediated CD73
internalization of the indicated antibodies in SNU-C1 cells over
time.
[0042] FIG. 1J shows the percentage of CD73 internalized in
NCI-H1437 cells (non-small cell lung carcinoma cell line) treated
with the indicated antibodies over time, showing antibody mediated
CD73 internalization of the indicated antibodies in NCI-H1437 cells
over time.
[0043] FIG. 2 shows the binding kinetics of the indicated
anti-human GITR antibodies to anti-CD3 (plate coated) and
CD28-activated human CD4 T cells and their corresponding EC50
values derived from the graph.
[0044] FIGS. 3A-C show the secretion of IFN-.gamma. and IL-2 from
donor CD4 T cells stimulated with soluble anti-human GITR
antibodies with different heavy chain constant regions. FIG. 3A
shows IFN-.gamma. secretion from donor CD4 T cells stimulated with
OKT3 expressing CHO cells and various concentrations of anti-human
GITR antibodies with an IgG2-IgG1 constant region. FIG. 3B shows
IL-2 secretion from donor CD4 T cells stimulated with OKT3
expressing CHO cells and various concentrations of an IgG1 heavy
chain constant domain or an IgG2-IgG1 hybrid heavy chain constant
domain. FIG. 3C shows IL-2 secretion from donor CD4 T cells
stimulated with OKT3 expressing CHO cells and various
concentrations of effectorless versions (IgG1.1) of the antibodies
in FIGS. 3A and B.
[0045] FIG. 4 shows IL-2 secretion from 3A9-hGITR cells cultured on
anti-CD3 monoclonal antibody-coated plates in the presence of
increasing amounts of the indicated anti-human GITR antibodies: the
hybridoma anti-GITR (IgG2) and recombinant derivatives as IgG1f,
IgG1.1 (effectorless), or as chimera with the IgG2 hinge.
[0046] FIGS. 5A-D show the effect of an IgG2 hinge on the size of
antibody/antigen complexes. FIGS. 5A-C show SEC chromatogram data,
DLS data and MALS data, for complexes of hCD73-his with the
antibody CD73.4 containing different constant regions. FIG. 5D
shows a schematic model of the hCD73-his/mAb complexes derived from
the MALS-determined masses in FIG. 5C.
[0047] FIG. 6 shows SEC-MALS data for CD73/mAb complexes.
[0048] FIG. 7 shows DLS data for CD73/mAb complexes.
[0049] FIG. 8A shows the percentage of CD73 internalized in Calu6
cells treated with the indicated antibodies over time, showing
antibody mediated CD73 internalization of the indicated antibodies
in Calu6 cells over time.
[0050] FIG. 8B shows the percentage of CD73 internalized in
NCI-H292 cells treated with the indicated antibodies over time,
showing antibody mediated CD73 internalization of the indicated
antibodies in Calu6 cells over time.
[0051] FIG. 8C shows the level of CD73 on the surface of Calu6
cells treated with 5 .mu.g/ml of the indicated antibodies for 0, 5,
15 or 30 minutes.
[0052] FIG. 9 shows the level of IL-2 secreted by CD4+ T cells
co-cocultured with CHO-OKT3 cells in the presence of an anti-GITR
antibody having the indicated constant regions.
[0053] FIG. 10 shows the percentage of antibody mediated CD73
internalization at 1, 4 or 21 hours after the addition of each of
the shown antibodies. The bars for each antibody are shown in the
order of 21 hours (on the left), 4 hours (middle) and 1 hour
(right).
[0054] FIG. 11A shows overlay of SEC chromatogram data for 1:1
molar complexes of hCD73-his with 16 different CD73.4 antibodies
containing different constant region sequences.
[0055] FIG. 11B shows an expansion of the chromatogram data from
11-19.5 min of the chromatogram of FIG. 10A, with 4 distinct
elution species indicated.
[0056] FIG. 11C shows the percentage of the UV chromatogram signal
area for peak 2 of FIG. 11B, plotted for the 16 different
antibody/CD73-his complexes. Data is sorted from left to right in
order of increasing peak area.
[0057] FIG. 12 shows antibody binding to anti-his Fab captured
Fc.gamma.R-his proteins. Binding responses are plotted as a
percentage of the theoretical Rmax assuming a 1:1 mAb:Fc.gamma.R
binding stoichiometry. The bars for each antibody are shown in the
order provided by the color legends at the bottom of the slide.
[0058] FIG. 13 shows antibody binding to anti-his Fab captured
FcgR-his proteins. Binding responses are plotted as a percentage of
the theoretical Rmax assuming a 1:1 mAb:Fc.gamma.R binding
stoichiometry. The bars for each antibody are shown in the order
provided by the color legends at the bottom of the slide.
[0059] FIG. 14A shows antibody binding to anti-his Fab captured
Fc.gamma.R-his proteins. Binding responses are plotted as a
percentage of the theoretical Rmax assuming a 1:1 mAb:Fc.gamma.R
binding stoichiometry. The bars for each antibody are shown in the
order provided by the color legends at the bottom of the slide.
[0060] FIG. 14B shows antibody binding to anti-his Fab captured
Fc.gamma.R-his proteins. Binding responses are plotted as a
percentage of the theoretical Rmax assuming a 1:1 mAb:Fc.gamma.R
binding stoichiometry. The bars for each antibody are shown in the
order provided by the color legends at the bottom of the slide.
[0061] FIG. 15 shows an internalization time course analysis of
anti-GITR antibodies.
[0062] FIG. 16A shows GITR and early endosome marker EEA2
co-localization analysis at time zero.
[0063] FIG. 16B shows GITR and early endosome marker EEA2
co-localization analysis at time 30 and 120 minutes.
[0064] FIG. 16C shows the results of quantification of endosomal
co-localization shown in FIGS. 16A and B plotted as the ratio of
colocalized pixel intensity relative to total staining.
[0065] FIG. 17A shows NFkB signaling activation in CD8+ T cells
treated with the indicated anti-GITR antibodies.
[0066] FIG. 17B shows NFkB signaling activation in CD4+ T cells
treated with the indicated anti-GITR antibodies.
[0067] FIG. 18 shows P38 activation in CD4+ T cells treated with
the indicated anti-GITR antibodies.
[0068] FIG. 19 shows the configuration of the disulfide bonds in
IgG2 antibodies having conformation A, B or A/B.
[0069] FIG. 20A shows the level of IL-2 secreted by CD4+ T cells
co-cocultured with CHO-OKT3 cells in the presence of different
concentrations of an anti-GITR antibody having the indicated
constant regions.
[0070] FIG. 20B shows the level of IL-2 secreted by CD4+ T cells
co-cocultured with CHO-OKT3 cells in the presence of 5 .mu.g/ml of
an anti-GITR antibody having the indicated constant regions (same
experiment as that in FIG. 20A).
[0071] FIG. 20C shows the level of IL-2 secreted by CD4+ T cells
co-cocultured with CHO-OKT3 cells in the presence of 1.25 .mu.g/ml
of an anti-GITR antibody having the indicated constant regions
(same experiment as that in FIG. 20A).
[0072] FIG. 20D shows the level of IL-2 secreted by CD4+ T cells
co-cocultured with CHO-OKT3 cells in the presence of 0.313 .mu.g/ml
of an anti-GITR antibody having the indicated constant regions
(same experiment as that in FIG. 20A).
DETAILED DESCRIPTION
[0073] The invention is based, at least in part, on the findings
that the following properties of antibodies are enhanced or altered
when the antibodies comprise an IgG2 hinge relative to the same
antibodies that comprise a non-IgG2 hinge (or relative to the same
antibodies comprising an IgG1 constant region): (i)
internalization; (ii) agonist function; (iii) receptor mediated
intracellular signaling; (iv) ADCC; and (v) weight of
antibody/antigen complexes. In addition, these enhanced or altered
features of antibodies are further enhanced or altered when the
antibodies comprise, in addition to an IgG2 hinge, an IgG2 CH1
domain. It has also been observed that antibodies having an IgG2
CH1 domain, but not an IgG2 hinge, have enhanced or altered
activities compared to the same antibodies having an IgG1 CH1
domain. Without wanting to be limited to a particular mechanism of
action, the enhancing effects of an IgG2 hinge has been found to
correlate with an increase in size of antibody/antigen complexes.
The enhanced size of antibody/antigen complexes when the antibody
has an IgG2 hinge may result from a higher rigidity of IgG2 hinges
relative to that of other isotypes. Furthermore, it has been shown
that specific regions or amino acid residues of the IgG2 hinge and
CH1 domain may be modified, whereas others are preferably not
modified, to preserve the enhanced or altered activities.
[0074] As further described herein, these modified heavy chain
constant regions conferring onto antibodies (or antigen binding
regions thereof) enhanced or modified activities may have effector
function. Thus, it was shown that antibodies may be created that
have the advantageous properties conferred by an IgG2 hinge and/or
CH1 domain and also have effector function.
[0075] The invention is also based at least in part on the finding
that deletion of certain portions of a hinge in an IgG1 or IgG2
antibody results in the antibody having enhanced or altered
properties relative to the antibody with an IgG1 constant
region.
[0076] Accordingly, provided herein are (i) antibodies having
modified heavy chain constant regions conferring to the antigen
binding regions of the antibodies enhanced or altered properties
and methods of using them, and (ii) methods for enhancing or
altering certain biological properties of antibodies that comprise
a non-IgG2 hinge and/or CH1 domain, such as internalization,
agonism and antagonism, wherein the method comprises replacing the
non-IgG2 hinge and/or CH1 domain of the antibody with an IgG2 hinge
and/or IgG2 CH1 domain or portion thereof.
[0077] Provided herein are "modified heavy chain constant regions"
that enhance certain biological properties of antibodies, e.g.,
antibodies that have a non-IgG2 hinge and/or a non-IgG2 CH1 domain,
relative to the same antibodies having different constant regions.
Exemplary modified heavy chain constant regions include an IgG2
hinge, a CH1 domain, a CH2 domain and a CH3 domain, wherein at
least one of these constant domains is not of the IgG2 isotype and
may be, e.g., of an IgG, IgG3 or IgG4. In certain embodiments, a
modified heavy chain constant region comprises an IgG2 hinge and
IgG1 CH2 and CH3 domains. In certain embodiments, a modified heavy
chain constant region comprises an IgG2 CH1 domain and an IgG2
hinge. In certain embodiments, a modified heavy chain constant
region comprises an IgG2 CH1 domain, an IgG2 hinge, an IgG1 CH2
domain and an IgG1 CH3 domain. A modified heavy chain constant
region may have effector function similar to that of wild-type IgG,
or may be engineered to have reduced or enhanced effector function
relative to that of the wildtype IgG. A modified heavy chain
constant region may comprise a wildtype CH1, hinge, CH2 and/or CH3
domain, or a variant thereof, e.g., a CH1, hinge, CH2 and/or CH3
domain having one or more amino acid substitutions, deletions or
additions relative to the corresponding wildtype domain, and/or
having an amino acid sequence that is at least 90% identical, or
more, to the corresponding wildtype sequence.
Definitions
[0078] In order that the present description may be more readily
understood, certain terms are first defined. Additional definitions
are set forth throughout the detailed description.
[0079] The term "antibody" as used herein may include whole
antibodies and any antigen binding fragments (e.g., an antigen
binding fragment that includes a hinge, an antigen binding fragment
that includes a hinge and a CH1 domain, an antigen binding fragment
that includes a hinge and CH2 domain, or an antigen binding
fragment that includes a hinge, a CH2 domain and a portion of a CH3
domain) or single chains thereof. In one embodiment, an "antibody"
refers to a protein, e.g., a glycoprotein, comprising at least two
heavy (H) chains and two light (L) chains inter-connected by
disulfide bonds, or an antigen binding portion thereof. Each heavy
chain is comprised of a heavy chain variable region (abbreviated
herein as V.sub.H) and a heavy chain constant region. In certain
naturally occurring IgG, IgD and IgA antibodies, the heavy chain
constant region is comprised of a hinge, a CH1 domain, a CH2 domain
and a CH3 domain. In certain naturally occurring antibodies, each
light chain is comprised of a light chain variable region
(abbreviated herein as V.sub.L) and a light chain constant region.
The light chain constant region is comprised of one domain, CL. The
V.sub.H and V.sub.L regions can be further subdivided into regions
of hypervariability, termed complementarity determining regions
(CDR), interspersed with regions that are more conserved, termed
framework regions (FR). Each V.sub.H and V.sub.L is composed of
three CDRs and four FRs, arranged from amino-terminus to
carboxy-terminus in the following order: FR1, CDR1, FR2, CDR2, FR3,
CDR3, FR4. The variable regions of the heavy and light chains
contain a binding domain that interacts with an antigen. The
constant regions of the antibodies may mediate the binding of the
immunoglobulin to host tissues or factors, including various cells
of the immune system (e.g., effector cells) and the first component
(Clq) of the classical complement system.
[0080] An immunoglobulin may be from any of the commonly known
isotypes, including but not limited to IgA, secretory IgA, IgG and
IgM. The IgG isotype is divided in subclasses in certain species:
IgG1, IgG2, IgG3 and IgG4 in humans, and IgG1, IgG2a, IgG2b and
IgG3 in mice. In certain embodiments, the antibodies described
herein are of the human IgG1 or IgG2 subtype. Immunoglobulins,
e.g., human IgG1, exist in several allotypes, which differ from
each other in at most a few amino acids. "Antibody" may include, by
way of example, both naturally occurring and non-naturally
occurring antibodies; monoclonal and polyclonal antibodies;
chimeric and humanized antibodies; human and nonhuman antibodies;
wholly synthetic antibodies; and single chain antibodies.
[0081] In certain embodiments, a heavy chain of an antibody
comprises a C-terminal lysine; a C-terminal glycine (having lost
the C-terminal lysine), or is lacking GK or is lacking K. When
referring to antibodies comprising a modified heavy chain constant
region described herein, the antibody may comprise a provided
sequence having the C-terminal GK or K, or alternatively, lacking
GK or K.
[0082] Amino acid numbering is according to the EU index as in
Kabat. Kabat et al. (1991) Sequences of Proteins of Immunological
Interest, National Institutes of Health, Bethesda, Md., and
according to FIGS. 3c-3f of U.S. Pat. App. Pub. No.
2008/0248028.
[0083] The term "antigen-binding portion" of an antibody, as used
herein, refers to one or more fragments of an antibody that retain
the ability to specifically bind to an antigen. An antigen-binding
portion of an antibody can be a "hinge containing antigen binding
portion." It has been shown that the antigen-binding function of an
antibody can be performed by fragments of a full-length antibody.
Examples of binding fragments encompassed within the term
"antigen-binding portion" of an antibody described herein, include
(i) a Fab fragment, a monovalent fragment consisting of the
V.sub.L, V.sub.H, CL and CH1 domains; (ii) a F(ab').sub.2 fragment,
a bivalent fragment comprising two Fab fragments linked by a
disulfide bridge at the hinge region; (iii) a Fd fragment
consisting of the V.sub.H and CH1 domains; (iv) a Fv fragment
consisting of the V.sub.L and V.sub.H domains of a single arm of an
antibody, (v) a dAb fragment (Ward et al., (1989) Nature
341:544-546), which consists of a V.sub.H domain; and (vi) an
isolated complementarity determining region (CDR) or (vii) a
combination of two or more isolated CDRs which may optionally be
joined by a synthetic linker. Furthermore, although the two domains
of the Fv fragment, V.sub.L and V.sub.H, are coded for by separate
genes, they can be joined, using recombinant methods, by a
synthetic linker that enables them to be made as a single protein
chain in which the V.sub.L and V.sub.H regions pair to form
monovalent molecules known as single chain Fv (scFv); see e.g.,
Bird et al. (1988) Science 242:423-426; and Huston et al. (1988)
Proc. Natl. Acad. Sci. USA 85:5879-5883). Such single chain
antibodies are also intended to be encompassed within the term
"antigen-binding portion" of an antibody. These and other potential
constructs are described at Chan & Carter (2010) Nat. Rev.
Immunol. 10:301. These antibody fragments are obtained using
conventional techniques known to those with skill in the art, and
the fragments are screened for utility in the same manner as are
intact antibodies. Antigen-binding portions can be produced by
recombinant DNA techniques, or by enzymatic or chemical cleavage of
intact immunoglobulins.
[0084] A "CDR" of a variable domain are amino acid residues within
the hypervariable region that are identified in accordance with the
definitions of the Kabat, Chothia, the combination of both Kabat
and Chothia, AbM, contact, and/or conformational definitions or any
method of CDR determination well known in the art. Antibody CDRs
may be identified as the hypervariable regions originally defined
by Kabat et al. See, e.g., Kabat et al., 1992, Sequences of
Proteins of Immunological Interest, 5th ed., Public Health Service,
NIH, Washington D.C. The positions of the CDRs may also be
identified as the structural loop structures originally described
by Chothia and others. See, e.g., Chothia et al., 1989, Nature
342:877-883. Other approaches to CDR identification include the
"AbM definition," which is a compromise between Kabat and Chothia
and is derived using Oxford Molecular's AbM antibody modeling
software (now Accelrys.RTM.), or the "contact definition" of CDRs
based on observed antigen contacts, set forth in MacCallum et al.,
1996, J. Mol. Biol., 262:732-745. In another approach, referred to
herein as the "conformational definition" of CDRs, the positions of
the CDRs may be identified as the residues that make enthalpic
contributions to antigen binding. See, e.g., Makabe et al., 2008,
Journal of Biological Chemistry, 283:1156-1166. Still other CDR
boundary definitions may not strictly follow one of the above
approaches, but will nonetheless overlap with at least a portion of
the Kabat CDRs, although they may be shortened or lengthened in
light of prediction or experimental findings that particular
residues or groups of residues or even entire CDRs do not
significantly impact antigen binding. As used herein, a CDR may
refer to CDRs defined by any approach known in the art, including
combinations of approaches. The methods used herein may utilize
CDRs defined according to any of these approaches. For any given
embodiment containing more than one CDR, the CDRs may be defined in
accordance with any of Kabat, Chothia, extended, AbM, contact,
and/or conformational definitions.
[0085] As used herein, "isotype" refers to the antibody class
(e.g., IgG1, IgG2, IgG3, IgG4, IgM, IgA1, IgA2, IgD, and IgE
antibody) that is encoded by the heavy chain constant domain genes.
The full-length amino acid sequence of each wild type human IgG
constant region (including all domains, i.e., CH1 domain, hinge,
CH2 domain, and CH3 domain) is cataloged in the UniProt database
available on-line, e.g., as P01857 (IgG1), P01859 (IgG2), P01860
(IgG3), and P01861 (IgG4), or different allotypes thereof (SEQ ID
NOs: 1, 6, 11, and 16, respectively). As used herein, a domain of a
heavy chain constant region, e.g., the hinge, is of an "IgG1
isotype," "IgG2 isotype," "IgG3 isotype," or "IgG4 isotype," if the
domain comprises the amino acid sequence of the corresponding
domain of the respective isotype, or a variant thereof (that has a
higher homology to the corresponding domain of the respective
isotype than it does to that of the other isotypes).
[0086] "Allotype" refers to naturally occurring variants within a
specific isotype group, which variants differ in a few amino acids
(see, e.g., Jefferies et al. (2009) mAbs 1:1). Antibodies described
herein may be of any allotype.
[0087] A "wildtype" protein or portion thereof is a version of the
protein as it is found in nature. An amino acid sequence of a
wildtype protein, e.g., a heavy chain constant region, is the amino
acid sequence of the protein as it occurs in nature. Due to
allotypic differences, there can be more than one amino acid
sequence for a wildtype protein. For example, there are several
allotypes of naturally occurring human IGg1 heavy chain constant
regions (see, e.g., Jeffries et al. (2009) mAbs 1:1).
[0088] An "Fc region" (fragment crystallizable region) or "Fc
domain" or "Fc" refers to the C-terminal region of the heavy chain
of an antibody that mediates the binding of the immunoglobulin to
host tissues or factors, including binding to Fc receptors located
on various cells of the immune system (e.g., effector cells) or to
the first component (Clq) of the classical complement system. Thus,
an Fc region of an antibody of isotype IgG comprises the heavy
chain constant region of the antibody excluding the first constant
region immunoglobulin domain (CH1). In IgG, IgA and IgD antibody
isotypes, the Fc region comprises C.sub.H2 and C.sub.H3 constant
domains in each of the antibody's two heavy chains; IgM and IgE Fc
regions comprise three heavy chain constant domains (C.sub.H
domains 2-4) in each polypeptide chain. For IgG, the Fc region
comprises immunoglobulin domains consisting of the hinge, CH2 and
CH3. For purposes herein, the Fc region is defined as starting at
amino acid 216 and ending at amino acid 447, wherein the numbering
is according to the EU index as in Kabat. Kabat et al. (1991)
Sequences of Proteins of Immunological Interest, National
Institutes of Health, Bethesda, Md., and according to FIGS. 3c-3f
of U.S. Pat. App. Pub. No. 2008/0248028. The Fc may be a native (or
naturally-occurring or wildtype) Fc, including any allotypic
variant, or a variant Fc (e.g., a non-naturally occurring Fc),
comprising, e.g., 1, 2, 3, 4, 5, 1-5, 1-10 or 5-10 or more amino
acid mutations, e.g., substitutions, additions or deletions. For
example, a variant Fc may comprise an amino acid sequence that is
at least 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to
a wildtype Fc. Modified or mutated Fcs may have enhanced or reduced
effector function and/or half-life. The CH2 and CH3 regions are the
primary site of effector functions and FcRn binding. Fc may refer
to this region in isolation or in the context of an Fc-comprising
protein polypeptide such as a "binding protein comprising an Fc
region," also referred to as an "Fc fusion protein" (e.g., an
antibody or immunoadhesin).
[0089] An "effector function" refers to the interaction of an
antibody Fc region with an Fc receptor or ligand, or a biochemical
event that results therefrom. Exemplary "effector functions"
include Clq binding, complement dependent cytotoxicity (CDC), Fc
receptor binding, Fc.gamma.R-mediated effector functions such as
ADCC and antibody dependent cell-mediated phagocytosis (ADCP), and
downregulation of a cell surface receptor (e.g., the B cell
receptor; BCR). Such effector functions generally require the Fc
region to be combined with a binding domain (e.g., an antibody
variable domain).
[0090] An "Fc receptor" or "FcR" is a receptor that binds to the Fc
region of an immunoglobulin. FcRs that bind to an IgG antibody
comprise receptors of the Fc.gamma.R family, including allelic
variants and alternatively spliced forms of these receptors. The
Fc.gamma.R family consists of three activating (Fc.gamma.RI,
Fc.gamma.RIII, and Fc.gamma.RIV in mice; Fc.gamma.RIA,
Fc.gamma.RIIA, and Fc.gamma.RIIIA in humans) and one inhibitory
(Fc.gamma.RIIB) receptor. Various properties of human Fc.gamma.Rs
are summarized in Table 1. The majority of innate effector cell
types coexpress one or more activating Fc.gamma.R and the
inhibitory Fc.gamma.RIIB, whereas natural killer (NK) cells
selectively express one activating Fc receptor (Fc.gamma.RIII in
mice and Fc.gamma.RIIIA in humans) but not the inhibitory
Fc.gamma.RIIB in mice and humans. Human IgG1 binds to most human Fc
receptors and is considered equivalent to murine IgG2a with respect
to the types of activating Fc receptors that it binds to.
TABLE-US-00004 TABLE 1 Properties of human Fc.gamma.Rs Affinity
Allelic for human Isotype Fc.gamma. variants IgG preference
Cellular distribution Fc.gamma.RI None High IgG1 = Monocytes,
macrophages, described (K.sub.D~10 3 > 4 >> 2 activated
neutrophils, nM) dendritic cells? Fc.gamma.RIIA H131 Low to IgG1
> Neutrophils, monocytes, medium 3 > 2 > 4 macrophages,
eosinophils, R131 Low IgG1 > dendritic cells, platelets 3 > 4
> 2 Fc.gamma.RIIIA V158 Medium IgG1 = NK cells, monocytes, 3
>> 4 > 2 macrophages, mast cells, F158 Low IgG1 =
eosinophils, dendritic 3 >> 4 >2 cells? Fc.gamma.RIIB I232
Low IgG1 = B cells, monocytes, 3 = 4 > 2 macrophages, dendritic
T232 Low IgG1 = cells, mast cells 3 = 4 > 2
[0091] A "hinge", "hinge domain" or "hinge region" or "antibody
hinge region" refers to the domain of a heavy chain constant region
that joins the CH1 domain to the CH2 domain and includes the upper,
middle, and lower portions of the hinge (Roux et al. J. Immunol.
1998 161:4083). The hinge provides varying levels of flexibility
between the binding and effector regions of an antibody and also
provides sites for intermolecular disulfide bonding between the two
heavy chain constant regions. As used herein, a hinge starts at
Glu216 and ends at Gly237 for all IgG isotypes (Roux et al., 1998 J
Immunol 161:4083). The sequences of wildtype IgG1, IgG2, IgG3 and
IgG4 hinges are show in Table 2.
TABLE-US-00005 TABLE 2 Hinge region amino acids Ig Type C-terminal
CH1* Upper Hinge Middle Hinge Lower Hinge IgG1 VDKRV EPKSCDKTHT
CPPCP APELLGG (SEQ ID NO: 57) (SEQ ID NO: 59) (SEQ ID NO: 64) (SEQ
ID NO: 70) IgG2 VDKTV ERK CCVECPPCP APPVAG (SEQ ID NO: 58) (SEQ ID
NO: 60) (SEQ ID NO: 65) (SEQ ID NO: 71) IgG3 VDKRV ELKTPLGDTTHT
CPRCP APELLGG (17-15-15-15) (SEQ ID NO: 57) (SEQ ID NO: 61) (SEQ ID
NO: 66) (SEQ ID NO: 70) (EPKSCDTPPPCPRCP).sub.3 (SEQ ID NO: 67)
IgG3 VDKRV ELKTPLGDTTHT CPRCP APELLGG (17-15-15) (SEQ ID NO: 57)
(SEQ ID NO: 61) CPRCP (SEQ ID NO: 70) (SEQ ID NO: 66)
(EPKSCDTPPPCPRCP).sub.2 (SEQ ID NO: 67) IgG3 (17-15) VDKRV
ELKTPLGDTTHT CRPCP APELLGG (SEQ ID NO: 57) (SEQ ID NO: 61) (SEQ ID
NO: 66) (SEQ ID NO: 70) (EPKSCDTPPPCPRCP).sub.3 (SEQ ID NO: 67)
IgG3 VDKRV EPKS CDTPPPCPRCP APELLGG (15-15-15) (SEQ ID NO: 57) (SEQ
ID NO: 62) (SEQ ID NO: 68) (SEQ ID NO: 70) (EPKSCDTPPPCPRCP).sub.2
(SEQ ID NO: 67) IgG3 (15) VDKRF EPKS CDTPPPCPRCP APELLGG (SEQ ID
NO: 57) (SEQ ID NO: 62) (SEQ ID NO: 68) (SEQ ID NO: 70) IgG4 VDKRV
ESKYGPP CPSCP APEFLGG (SEQ ID NO: 57) (SEQ ID NO: 63) (SEQ ID NO:
69) (SEQ ID NO: 70) *C-terminal amino acid sequences of the CH1
domains.
[0092] The term "hinge" includes wildtype hinges (such as those set
forth in Table 3), as well as variants thereof (e.g.,
non-naturally-occurring hinges or modified hinges). For example,
the term "IgG2 hinge" includes wildtype IgG2 hinge, as shown in
Table 3, and variants having 1, 2, 3, 4, 5, 1-3, 1-5, 3-5 and/or at
most 5, 4, 3, 2, or 1 mutations, e.g., substitutions, deletions or
additions. Exemplary IgG2 hinge variants include IgG2 hinges in
which 1, 2, 3 or all 4 cysteines (C219, C220, C226 and C229) are
changed to another amino acid. In a specific embodiment, an IgG2
hinge comprises a C219X or C220X substitution, wherein X is any
amino acid, except cysteine. An IgG2 hinge may comprise a
substitution, which alone, or together with one or more
substitutions in other regions of the heavy or light chain will
cause the antibody comprising the hinge to adopt form A or B (see,
e.g., Allen et al. (2009) Biochemistry 48:3755). In certain
embodiments, a hinge is a hybrid hinge that comprises sequences
from at least two isotypes. For example, a hinge may comprise the
upper, middle or lower hinge from one isotype and the remainder of
the hinge from one or more other isotypes. For example, a hinge can
be an IgG2/IgG1 hinge, and may comprise, e.g., the upper and middle
hinges of IgG2 and the lower hinge of IgG1. A hinge may have
effector function or be deprived of effector function. For example,
the lower hinge of wildtype IgG1 provides effector function.
[0093] A "non-IgG2" hinge refers to a hinge that is not of the IgG2
isotype.
[0094] The term "CH1 domain" refers to the heavy chain constant
region linking the variable domain to the hinge in a heavy chain
constant domain. As used herein, a CH1 domain starts at A118 and
ends at V215. The term "CH1 domain" includes wildtype CH1 domains
(such as having SEQ ID NO: 2 for IgG1 and SEQ ID NO: 7 for IgG2;
Table 3), as well as variants thereof (e.g.,
non-naturally-occurring CH1 domains or modified CH1 domains). For
example, the term "CH1 domain" includes wildtype CH1 domains and
variants thereof having 1, 2, 3, 4, 5, 1-3, 1-5, 3-5 and/or at most
5, 4, 3, 2, or 1 mutations, e.g., substitutions, deletions or
additions. Exemplary CH1 domains include CH1 domains with mutations
that modify a biological activity of an antibody, such as ADCC, CDC
or half-life. Modifications to the CH1 domain that affect a
biological activity of an antibody are provided herein.
[0095] The term "CH2 domain" refers to the heavy chain constant
region linking the hinge to the CH3 domain in a heavy chain
constant domain. As used herein, a CH2 domain starts at P238 and
ends at K340. The term "CH2 domain" includes wildtype CH2 domains
(such as having SEQ ID NO: 4 for IgG1; Table 3), as well as
variants thereof (e.g., non-naturally-occurring CH2 domains or
modified CH2 domains). For example, the term "CH2 domain" includes
wildtype CH2 domains and variants thereof having 1, 2, 3, 4, 5,
1-3, 1-5, 3-5 and/or at most 5, 4, 3, 2, or 1 mutations, e.g.,
substitutions, deletions or additions. Exemplary CH2 domains
include CH2 domains with mutations that modify a biological
activity of an antibody, such as ADCC, CDC or half-life. In certain
embodiments, a CH2 domain comprises the substitutions A330S/P331S
that reduce effector function. Other modifications to the CH2
domain that affect a biological activity of an antibody are
provided herein.
[0096] The term "CH3 domain" refers to the heavy chain constant
region that is C-terminal to the CH2 domain in a heavy chain
constant domain. As used herein, a CH3 domain starts at G341 and
ends at K447. The term "CH3 domain" includes wildtype CH3 domains
(such as having SEQ ID NO: 5 for IgG1; Table 3), as well as
variants thereof (e.g., non-naturally-occurring CH3 domains or
modified CH3 domains). For example, the term "CH3 domain" includes
wildtype CH3 domains and variants thereof having 1, 2, 3, 4, 5,
1-3, 1-5, 3-5 and/or at most 5, 4, 3, 2, or 1 mutations, e.g.,
substitutions, deletions or additions. Exemplary CH3 domains
include CH3 domains with mutations that modify a biological
activity of an antibody, such as ADCC, CDC or half-life.
Modifications to the CH3 domain that affect a biological activity
of an antibody are provided herein.
TABLE-US-00006 TABLE 3 Domain Amino acid sequence SEQ ID NO: IgG1
CH1 ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHT 2
FPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPSNTKVDKKV IgG1
EPKSCDKTHTCPPCPAPELLGG 3 Hinge IgG1 CH2
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT 4
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKAK IgG1 CH3
GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYK 5
TTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLS PGK IgG2 CH1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGVHT 7
FPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKPSNTKVDKTV IgG2
ERKCCVECPPCPAPPVAG 8 Hinge IgG2 CH2
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT 9
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKTISKTK IgG2 CH3
GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPE-NNY 10
KTTPPMLDSDGSFFLYSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSL SPGK IgG3 CH1
ASTKGPSVFPLAPCSRSTSGGTAALGCLVKDYFPEPVTVSWNSGALTSGVHT 12
FPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCNVNHKPSNTKVDKRV IgG3
ELKTPLGDTTHTCPRCPE 13 Hinge IgG3 CH2
PKSCDTPPPCPRCPEPKSCDTPPPCPRCPEPKSCDTPPPCPRCPAPELLGGP 14
SVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFKWYVDGVEVHNAKTK
PREEQYNSTFRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEKTISKTK IgG3 CH3
GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWESSGQPENNYN 15
TTPPMLDSDGSFFLYSKLTVDKSRWQQGNIFSCSVMHEALHNRFTQKSLSLS PGK IgG4 CH1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGVHT 17
FPAVLQSSGLYSLSSVVTVPSSSLGTKTYTCNVDHKPSNTKVDKRV IgG4
ESKYGPPCPSCPAPEFLGG 18 Hinge IgG4 CH2
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSQEDPEVQFNWYVDGVEVHNAKT 19
KPREEQFNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKGLPSSIEKTISKAK IgG4 CH3
GQPREPQVYTLPPSQEEMTKNQVSLTCLVKGFYPSDIAVEWESNGQPENNYK 20
TTPPVLDSDGSFFLYSRLTVDKSRWQEGNVFSCSVMHEALHNHYTQKSLSLS LGK
[0097] The term "monoclonal antibody," as used herein, refers to an
antibody that displays a single binding specificity and affinity
for a particular epitope or a composition of antibodies in which
all antibodies display a single binding specificity and affinity
for a particular epitope. Typically such monoclonal antibodies will
be derived from a single cell or nucleic acid encoding the
antibody, and will be propagated without intentionally introducing
any sequence alterations. Accordingly, the term "human monoclonal
antibody" refers to a monoclonal antibody that has variable and
optional constant regions derived from human germline
immunoglobulin sequences. In one embodiment, human monoclonal
antibodies are produced by a hybridoma, for example, obtained by
fusing a B cell obtained from a transgenic or transchromosomal
non-human animal (e.g., a transgenic mouse having a genome
comprising a human heavy chain transgene and a light chain
transgene), to an immortalized cell.
[0098] The term "recombinant human antibody," as used herein,
includes all human antibodies that are prepared, expressed, created
or isolated by recombinant means, such as (a) antibodies isolated
from an animal (e.g., a mouse) that is transgenic or
transchromosomal for human immunoglobulin genes or a hybridoma
prepared therefrom, (b) antibodies isolated from a host cell
transformed to express the antibody, e.g., from a transfectoma, (c)
antibodies isolated from a recombinant, combinatorial human
antibody library, and (d) antibodies prepared, expressed, created
or isolated by any other means that involve splicing of human
immunoglobulin gene sequences to other DNA sequences. Such
recombinant human antibodies comprise variable and constant regions
that utilize particular human germline immunoglobulin sequences are
encoded by the germline genes, but include subsequent
rearrangements and mutations that occur, for example, during
antibody maturation. As known in the art (see, e.g., Lonberg (2005)
Nature Biotech. 23(9):1117-1125), the variable region contains the
antigen binding domain, which is encoded by various genes that
rearrange to form an antibody specific for a foreign antigen. In
addition to rearrangement, the variable region can be further
modified by multiple single amino acid changes (referred to as
somatic mutation or hypermutation) to increase the affinity of the
antibody to the foreign antigen. The constant region will change in
further response to an antigen (i.e., isotype switch). Therefore,
the rearranged and somatically mutated nucleic acid sequences that
encode the light chain and heavy chain immunoglobulin polypeptides
in response to an antigen may not be identical to the original
germline sequences, but instead will be substantially identical or
similar (i.e., have at least 80% identity).
[0099] A "human" antibody (HuMAb) refers to an antibody having
variable regions in which both the framework and CDR regions are
derived from human germline immunoglobulin sequences. Furthermore,
if the antibody contains a constant region, the constant region
also is derived from human germline immunoglobulin sequences. The
antibodies described herein may include amino acid residues not
encoded by human germline immunoglobulin sequences (e.g., mutations
introduced by random or site-specific mutagenesis in vitro or by
somatic mutation in vivo). However, the term "human antibody", as
used herein, is not intended to include antibodies in which CDR
sequences derived from the germline of another mammalian species,
such as a mouse, have been grafted onto human framework sequences.
The terms "human" antibodies and "fully human" antibodies and are
used synonymously.
[0100] A "humanized" antibody refers to an antibody in which some,
most or all of the amino acids outside the CDR domains of a
non-human antibody are replaced with corresponding amino acids
derived from human immunoglobulins. In one embodiment of a
humanized form of an antibody, some, most or all of the amino acids
outside the CDR domains have been replaced with amino acids from
human immunoglobulins, whereas some, most or all amino acids within
one or more CDR regions are unchanged. Small additions, deletions,
insertions, substitutions or modifications of amino acids are
permissible as long as they do not abrogate the ability of the
antibody to bind to a particular antigen. A "humanized" antibody
retains an antigenic specificity similar to that of the original
antibody.
[0101] A "chimeric antibody" refers to an antibody in which the
variable regions are derived from one species and the constant
regions are derived from another species, such as an antibody in
which the variable regions are derived from a mouse antibody and
the constant regions are derived from a human antibody.
[0102] A "bispecific" or "bifunctional antibody" is an artificial
hybrid antibody having two different heavy/light chain pairs,
giving rise to two antigen binding sites with specificity for
different antigens. Bispecific antibodies can be produced by a
variety of methods including fusion of hybridomas or linking of
Fab' fragments. See, e.g., Songsivilai & Lachmann, Clin. Exp.
Immunol. 79:315-321 (1990); Kostelny et al., J. Immunol. 148,
1547-1553 (1992).
[0103] The phrases "an antibody recognizing an antigen" and "an
antibody specific for an antigen" are used interchangeably herein
with the term "an antibody which binds specifically to an
antigen."
[0104] An "isolated antibody," as used herein, is intended to refer
to an antibody that is substantially free of other antibodies
having different antigenic specificities (e.g., an isolated
antibody that specifically binds to antigen "x" is substantially
free of antibodies that specifically bind antigens other than
antigen "x"). An isolated antibody that specifically binds to an
epitope of antigen "x" may, however, have cross-reactivity to other
antigen "x" proteins from different species.
[0105] As used herein, an "agonist antibody" refers to an antibody
that is an agonist of a co-stimulatory receptor, e.g., an antibody
that is capable of boosting the immune system (or an immune
response) of a subject by stimulating the activity of a protein
that, in turn, stimulates an immune cell, e.g., a T cell, such as a
B7-1, B7-2, CD28, 4-1BB (CD137), 4-1BBL, GITR, ICOS, ICOS-L, OX40,
OX40L, CD70, or CD27, DR3, or CD28H protein. In certain
embodiments, an agonist antibody is an antibody that enhances the
activity of an inhibitory receptor, e.g., CTLA-4, PD-1, PD-L1,
PD-L2, or LAG-3, TIM-3, Galectin 9, CEACAM-1, BTLA, CD69,
Galectin-1, TIGIT, CD113, GPR56, VISTA, 2B4, CD48, GARP, CD73,
PD1H, LAIR1, TIM-1, or TIM-4, and thereby inhibits an immune
response.
[0106] As used herein, an "antagonist antibody" refers to an
antibody that is an antagonist of an inhibitory signal on an immune
cell, e.g., a T cell, e.g., an antibody that is capable of
inhibiting or blocking a protein that inhibits T cell activation
(e.g., immune checkpoint inhibitors), such as a CTLA-4, PD-1,
PD-L1, PD-L2, or LAG-3, TIM-3, Galectin 9, CEACAM-1, BTLA, CD69,
Galectin-1, TIGIT, CD113, GPR56, VISTA, 2B4, CD48, GARP, CD73,
PD1H, LAIR1, TIM-1, or TIM-4, and thereby stimulates an immune
response. In certain embodiments, an antagonist antibody is an
antibody that inhibits the activity of a stimulatory receptor,
e.g., B7-1, B7-2, CD28, 4-1BB (CD137), 4-1BBL, GITR, ICOS, ICOS-L,
OX40, OX40L, CD70, or CD27, DR3, or CD28H, and thereby inhibits an
immune response.
[0107] Both agonist and antagonist antibodies result in amplifying
antigen-specific T cell responses, or in inhibiting
antigen-specific T cell responses (immune checkpoint
regulators).
[0108] The term "epitope" or "antigenic determinant" refers to a
site on an antigen (e.g., GITR) to which an immunoglobulin or
antibody specifically binds. Epitopes within protein antigens can
be formed both from contiguous amino acids (usually a linear
epitope) or noncontiguous amino acids juxtaposed by tertiary
folding of the protein (usually a conformational epitope). Epitopes
formed from contiguous amino acids are typically, but not always,
retained on exposure to denaturing solvents, whereas epitopes
formed by tertiary folding are typically lost on treatment with
denaturing solvents. An epitope typically includes at least 3, 4,
5, 6, 7, 8, 9, 10, 11, 12, 13, 14 or 15 amino acids in a unique
spatial conformation. Methods for determining what epitopes are
bound by a given antibody (i.e., epitope mapping) are well known in
the art and include, for example, immunoblotting and
immunoprecipitation assays, wherein overlapping or contiguous
peptides from are tested for reactivity with a given antibody.
Methods of determining spatial conformation of epitopes include
techniques in the art and those described herein, for example,
x-ray crystallography, 2-dimensional nuclear magnetic resonance and
HDX-MS (see, e.g., Epitope Mapping Protocols in Methods in
Molecular Biology, Vol. 66, G. E. Morris, Ed. (1996)).
[0109] The term "naturally-occurring" as used herein as applied to
an object refers to the fact that an object can be found in nature.
For example, a polypeptide or polynucleotide sequence that is
present in an organism (including viruses) that can be isolated
from a source in nature and which has not been intentionally
modified by man in the laboratory is naturally-occurring.
[0110] A "polypeptide" refers to a chain comprising at least two
consecutively linked amino acid residues, with no upper limit on
the length of the chain. One or more amino acid residues in the
protein may contain a modification such as, but not limited to,
glycosylation, phosphorylation or a disulfide bond. A "protein" may
comprise one or more polypeptides.
[0111] The term "nucleic acid molecule," as used herein, is
intended to include DNA molecules and RNA molecules. A nucleic acid
molecule may be single-stranded or double-stranded, and may be
cDNA.
[0112] Also provided are "conservative sequence modifications" of
the sequences set forth herein include, for example, conservative
nucleotide and amino acid substitutions, as well as, nucleotide and
amino acid additions and deletions. For example, modifications can
be introduced into SEQ ID NOs: 1-74 by standard techniques known in
the art, such as site-directed mutagenesis and PCR-mediated
mutagenesis. Conservative sequence modifications include
conservative amino acid substitutions, in which the amino acid
residue is replaced with an amino acid residue having a similar
side chain. Families of amino acid residues having similar side
chains have been defined in the art. These families include amino
acids with basic side chains (e.g., lysine, arginine, histidine),
acidic side chains (e.g., aspartic acid, glutamic acid), uncharged
polar side chains (e.g., glycine, asparagine, glutamine, serine,
threonine, tyrosine, cysteine, tryptophan), nonpolar side chains
(e.g., alanine, valine, leucine, isoleucine, proline,
phenylalanine, methionine), beta-branched side chains (e.g.,
threonine, valine, isoleucine) and aromatic side chains (e.g.,
tyrosine, phenylalanine, tryptophan, histidine).
[0113] In one embodiment, amino acid sequence modifications to a
heavy chain constant region or domain thereof do not modify or
abrogate certain properties of the heavy chain constant region.
These properties include, e.g., the rigidity or stiffness of the
hinge, as well as agonist or antagonist activity of the antibody.
In certain embodiments, amino acid sequence modifications to a
heavy chain constant region or domain thereof do modify or abrogate
certain properties of the heavy chain constant region.
[0114] Methods of identifying amino acid conservative substitutions
that do and do not abrogate antibody and/or constant region
properties are well-known in the art, e.g., as described herein in
the Examples section.
[0115] For nucleic acids, the term "substantial homology" indicates
that two nucleic acids, or designated sequences thereof, when
optimally aligned and compared, are identical, with appropriate
nucleotide insertions or deletions, in at least about 80% of the
nucleotides, usually at least about 90% to 95%, and more preferably
at least about 98% to 99.5% of the nucleotides. Alternatively,
substantial homology exists when the segments will hybridize under
selective hybridization conditions, to the complement of the
strand.
[0116] For polypeptides, the term "substantial homology" indicates
that two polypeptides, or designated sequences thereof, when
optimally aligned and compared, are identical, with appropriate
amino acid insertions or deletions, in at least about 80% of the
amino acids, usually at least about 90% to 95%, and more preferably
at least about 98% to 99.5% of the amino acids.
[0117] The percent identity between two sequences is a function of
the number of identical positions shared by the sequences when the
sequences are optimally aligned (i.e., % homology=# of identical
positions/total # of positions.times.100), with optimal alignment
determined taking into account the number of gaps, and the length
of each gap, which need to be introduced for optimal alignment of
the two sequences. The comparison of sequences and determination of
percent identity between two sequences can be accomplished using a
mathematical algorithm, as described in the non-limiting examples
below.
[0118] The percent identity between two nucleotide sequences can be
determined using the GAP program in the GCG software package
(available at http://www.gcg.com), using a NWSgapdna.CMP matrix and
a gap weight of 40, 50, 60, 70, or 80 and a length weight of 1, 2,
3, 4, 5, or 6. The percent identity between two nucleotide or amino
acid sequences can also be determined using the algorithm of E.
Meyers and W. Miller (CABIOS, 4:11-17 (1989)) which has been
incorporated into the ALIGN program (version 2.0), using a PAM120
weight residue table, a gap length penalty of 12 and a gap penalty
of 4. In addition, the percent identity between two amino acid
sequences can be determined using the Needleman and Wunsch (J. Mol.
Biol. (48):444-453 (1970)) algorithm which has been incorporated
into the GAP program in the GCG software package (available at
http://www.gcg.com), using either a Blossum 62 matrix or a PAM250
matrix, and a gap weight of 16, 14, 12, 10, 8, 6, or 4 and a length
weight of 1, 2, 3, 4, 5, or 6.
[0119] The nucleic acid and protein sequences described herein can
further be used as a "query sequence" to perform a search against
public databases to, for example, identify related sequences. Such
searches can be performed using the NBLAST and XBLAST programs
(version 2.0) of Altschul, et al. (1990) J. Mol. Biol. 215:403-10.
BLAST nucleotide searches can be performed with the NBLAST program,
score=100, wordlength=12 to obtain nucleotide sequences homologous
to the nucleic acid molecules described herein. BLAST protein
searches can be performed with the XBLAST program, score=50,
wordlength=3 to obtain amino acid sequences homologous to the
protein molecules described herein. To obtain gapped alignments for
comparison purposes, Gapped BLAST can be utilized as described in
Altschul et al., (1997) Nucleic Acids Res. 25(17):3389-3402. When
utilizing BLAST and Gapped BLAST programs, the default parameters
of the respective programs (e.g., XBLAST and NBLAST) can be used.
See www.ncbi.nlm.nih.gov.
[0120] As used herein, the term "antigen" refers to any natural or
synthetic immunogenic substance, such as a protein, peptide, or
hapten. An antigen may be a full-length or mature protein, or a
fragment thereof.
[0121] An "immune response" refers to a biological response within
a vertebrate against foreign agents, which response protects the
organism against these agents and diseases caused by them. An
immune response is mediated by the action of a cell of the immune
system (for example, a T lymphocyte, B lymphocyte, natural killer
(NK) cell, macrophage, eosinophil, mast cell, dendritic cell or
neutrophil) and soluble macromolecules produced by any of these
cells or the liver (including antibodies, cytokines, and
complement) that results in selective targeting, binding to, damage
to, destruction of, and/or elimination from the vertebrate's body
of invading pathogens, cells or tissues infected with pathogens,
cancerous or other abnormal cells, or, in cases of autoimmunity or
pathological inflammation, normal human cells or tissues. An immune
reaction includes, e.g., activation or inhibition of a T cell,
e.g., an effector T cell or a Th cell, such as a CD4+ or CD8+ T
cell, or the inhibition of a Treg cell.
[0122] An "immunomodulator" or "immunoregulator" refers to an
agent, e.g., a component of a signaling pathway, that may be
involved in modulating, regulating, or modifying an immune
response. "Modulating," "regulating," or "modifying" an immune
response refers to any alteration in a cell of the immune system or
in the activity of such cell (e.g., an effector T cell). Such
modulation includes stimulation or suppression of the immune system
which may be manifested by an increase or decrease in the number of
various cell types, an increase or decrease in the activity of
these cells, or any other changes which can occur within the immune
system. Both inhibitory and stimulatory immunomodulators have been
identified, some of which may have enhanced function in a tumor
microenvironment. In preferred embodiments, the immunomodulator is
located on the surface of a T cell. An "immunomodulatory target" or
"immunoregulatory target" is an immunomodulator that is targeted
for binding by, and whose activity is altered by the binding of, a
substance, agent, moiety, compound or molecule.
[0123] Immunomodulatory targets include, for example, receptors on
the surface of a cell ("immunomodulatory receptors") and receptor
ligands ("immunomodulatory ligands"). "Immunotherapy" refers to the
treatment of a subject afflicted with, or at risk of contracting or
suffering a recurrence of, a disease by a method comprising
inducing, enhancing, suppressing or otherwise modifying an immune
response.
[0124] "Immunostimulating therapy" or "immunostimulatory therapy"
refers to a therapy that results in increasing (inducing or
enhancing) an immune response in a subject for, e.g., treating
cancer.
[0125] "Potentiating an endogenous immune response" means
increasing the effectiveness or potency of an existing immune
response in a subject. This increase in effectiveness and potency
may be achieved, for example, by overcoming mechanisms that
suppress the endogenous host immune response or by stimulating
mechanisms that enhance the endogenous host immune response.
[0126] "T effector" ("T.sub.eff") cells refers to T cells (e.g.,
CD4+ and CD8+ T cells) with cytolytic activities as well as T
helper (Th) cells, which secrete cytokines and activate and direct
other immune cells, but does not include regulatory T cells (Treg
cells).
[0127] As used herein, the term "linked" refers to the association
of two or more molecules. The linkage can be covalent or
non-covalent. The linkage also can be genetic (i.e., recombinantly
fused). Such linkages can be achieved using a wide variety of art
recognized techniques, such as chemical conjugation and recombinant
protein production.
[0128] As used herein, "administering" refers to the physical
introduction of a composition comprising a therapeutic agent to a
subject, using any of the various methods and delivery systems
known to those skilled in the art. Preferred routes of
administration for antibodies described herein include intravenous,
intraperitoneal, intramuscular, subcutaneous, spinal or other
parenteral routes of administration, for example by injection or
infusion. The phrase "parenteral administration" as used herein
means modes of administration other than enteral and topical
administration, usually by injection, and includes, without
limitation, intravenous, intraperitoneal, intramuscular,
intraarterial, intrathecal, intralymphatic, intralesional,
intracapsular, intraorbital, intracardiac, intradermal,
transtracheal, subcutaneous, subcuticular, intraarticular,
subcapsular, subarachnoid, intraspinal, epidural and intrasternal
injection and infusion, as well as in vivo electroporation.
Alternatively, an antibody described herein can be administered via
a non-parenteral route, such as a topical, epidermal or mucosal
route of administration, for example, intranasally, orally,
vaginally, rectally, sublingually or topically. Administering can
also be performed, for example, once, a plurality of times, and/or
over one or more extended periods.
[0129] As used herein, the term "T cell-mediated response" refers
to a response mediated by T cells, including effector T cells
(e.g., CD8.sup.+ cells) and helper T cells (e.g., CD4.sup.+ cells).
T cell mediated responses include, for example, T cell cytotoxicity
and proliferation.
[0130] As used herein, the term "cytotoxic T lymphocyte (CTL)
response" refers to an immune response induced by cytotoxic T
cells. CTL responses are mediated primarily by CD8.sup.+ T
cells.
[0131] As used herein, the terms "inhibits" or "blocks" (e.g.,
referring to inhibition/blocking of a ligand to its receptor or to
a subsequent intracellular response) are used interchangeably and
encompass both partial and complete inhibition/blocking. In some
embodiments, the antibody inhibits binding by at least about 50%,
for example, at least about 60%, 70%, 80%, 90%, 95%, 99%, or 100%,
determined, e.g., as further described herein.
[0132] As used herein, "cancer" refers a broad group of diseases
characterized by the uncontrolled growth of abnormal cells in the
body. Unregulated cell division may result in the formation of
malignant tumors or cells that invade neighboring tissues and may
metastasize to distant parts of the body through the lymphatic
system or bloodstream.
[0133] The terms "treat," "treating," and "treatment," as used
herein, refer to any type of intervention or process performed on,
or administering an active agent to, the subject with the objective
of reversing, alleviating, ameliorating, inhibiting, or slowing
down or preventing the progression, development, severity or
recurrence of a symptom, complication, condition or biochemical
indicia associated with a disease. Prophylaxis refers to
administration to a subject who does not have a disease, to prevent
the disease from occurring or minimize its effects if it does.
[0134] A "hematological malignancy" includes a lymphoma, leukemia,
myeloma or a lymphoid malignancy, as well as a cancer of the spleen
and the lymph nodes. Exemplary lymphomas include both B cell
lymphomas and T cell lymphomas. B-cell lymphomas include both
Hodgkin's lymphomas and most non-Hodgkin's lymphomas. Non-limiting
examples of B cell lymphomas include diffuse large B-cell lymphoma,
follicular lymphoma, mucosa-associated lymphatic tissue lymphoma,
small cell lymphocytic lymphoma (overlaps with chronic lymphocytic
leukemia), mantle cell lymphoma (MCL), Burkitt's lymphoma,
mediastinal large B cell lymphoma, Waldenstrom macroglobulinemia,
nodal marginal zone B cell lymphoma, splenic marginal zone
lymphoma, intravascular large B-cell lymphoma, primary effusion
lymphoma, lymphomatoid granulomatosis. Non-limiting examples of T
cell lymphomas include extranodal T cell lymphoma, cutaneous T cell
lymphomas, anaplastic large cell lymphoma, and angioimmunoblastic T
cell lymphoma. Hematological malignancies also include leukemia,
such as, but not limited to, secondary leukemia, chronic
lymphocytic leukemia, acute myelogenous leukemia, chronic
myelogenous leukemia, and acute lymphoblastic leukemia.
Hematological malignancies further include myelomas, such as, but
not limited to, multiple myeloma and smoldering multiple myeloma.
Other hematological and/or B cell- or T-cell-associated cancers are
encompassed by the term hematological malignancy.
[0135] The term "effective dose" or "effective dosage" is defined
as an amount sufficient to achieve or at least partially achieve a
desired effect. A "therapeutically effective amount" or
"therapeutically effective dosage" of a drug or therapeutic agent
is any amount of the drug that, when used alone or in combination
with another therapeutic agent, promotes disease regression
evidenced by a decrease in severity of disease symptoms, an
increase in frequency and duration of disease symptom-free periods,
or a prevention of impairment or disability due to the disease
affliction. A "prophylactically effective amount" or a
"prophylactically effective dosage" of a drug is an amount of the
drug that, when administered alone or in combination with another
therapeutic agent to a subject at risk of developing a disease or
of suffering a recurrence of disease, inhibits the development or
recurrence of the disease. The ability of a therapeutic or
prophylactic agent to promote disease regression or inhibit the
development or recurrence of the disease can be evaluated using a
variety of methods known to the skilled practitioner, such as in
human subjects during clinical trials, in animal model systems
predictive of efficacy in humans, or by assaying the activity of
the agent in in vitro assays.
[0136] By way of example, an anti-cancer agent is a drug that slows
cancer progression or promotes cancer regression in a subject. In
preferred embodiments, a therapeutically effective amount of a drug
promotes cancer regression to the point of eliminating the cancer.
"Promoting cancer regression" means that administering an effective
amount of the drug, alone or in combination with an anti-neoplastic
agent, results in a reduction in tumor growth or size, necrosis of
the tumor, a decrease in severity of at least one disease symptom,
an increase in frequency and duration of disease symptom-free
periods, a prevention of impairment or disability due to the
disease affliction, or otherwise amelioration of disease symptoms
in the patient. Pharmacological effectiveness refers to the ability
of the drug to promote cancer regression in the patient.
Physiological safety refers to an acceptably low level of toxicity,
or other adverse physiological effects at the cellular, organ
and/or organism level (adverse effects) resulting from
administration of the drug.
[0137] By way of example for the treatment of tumors, a
therapeutically effective amount or dosage of the drug preferably
inhibits cell growth or tumor growth by at least about 20%, more
preferably by at least about 40%, even more preferably by at least
about 60%, and still more preferably by at least about 80% relative
to untreated subjects. In the most preferred embodiments, a
therapeutically effective amount or dosage of the drug completely
inhibits cell growth or tumor growth, i.e., preferably inhibits
cell growth or tumor growth by 100%. The ability of a compound to
inhibit tumor growth can be evaluated using the assays described
infra. Alternatively, this property of a composition can be
evaluated by examining the ability of the compound to inhibit cell
growth, such inhibition can be measured in vitro by assays known to
the skilled practitioner. In other preferred embodiments described
herein, tumor regression may be observed and may continue for a
period of at least about 20 days, more preferably at least about 40
days, or even more preferably at least about 60 days.
[0138] The terms "patient" and "subject" refer to any human or
non-human animal that receives either prophylactic or therapeutic
treatment. For example, the methods and compositions described
herein can be used to treat a subject having cancer. The term
"non-human animal" includes all vertebrates, e.g., mammals and
non-mammals, such as non-human primates, sheep, dog, cow, chickens,
amphibians, reptiles, etc.
[0139] Various aspects described herein are described in further
detail in the following subsections.
I. Modified Heavy Chain Constant Regions
[0140] Described herein are "modified heavy chain constant
regions," which, when present in antibodies, enhance or alter
certain biological properties or features of the antibodies,
relative to the same antibodies that do not have a modified heavy
chain constant region, such as antibodies that contain a non-IgG2
hinge, e.g., IgG1 antibodies. Enhanced or altered biological
properties of antibodies include: [0141] (a) increased or altered
internalization by a cell; [0142] (b) increased or altered agonist
activity; [0143] (c) increased or altered antagonist or blocking
activity; [0144] (d) enhanced ADCC; [0145] (d) generation of a new
property; [0146] (e) increased or altered signal transduction;
[0147] (f) formation of larger antibody/antigen cross-linked
complexes; [0148] (g) increased clustering or oligomerization of
the target cell surface molecule; [0149] (h) increased stimulation
or enhancement of an immune response; and/or [0150] (i) increased
inhibition of an immune response.
[0151] In certain embodiments, an antibody comprising a modified
heavy chain constant region mediates antibody dependent receptor
(or ligand or surface molecule) internalization more effectively,
e.g., the antibody internalizes a target or surface molecule (e.g.,
a receptor or ligand) and/or is internalized itself with a higher
rate and/or extent of internalization into a cell after the
antibody binds to its target on the cell membrane, relative to the
same antibody that does not comprise a modified heavy chain
constant region, and comprises, e.g., an IgG1 heavy chain. The rate
and extent of internalization of an antibody can be determined,
e.g., as shown in the Examples. The rate of internalization, as
measured, e.g., by T.sub.1/2 of internalization, e.g., as shown in
the Examples, can be enhanced or increased by at least 10%, 30%,
50%, 75%, 2 fold, 3 fold, 5 fold or more, resulting in a reduction
of the T.sub.1/2 by at least 10%, 30%, 50%, 75%, 2 fold, 3 fold, 5
fold or more. For example, instead of having a T.sub.1/2 of 10
minutes, a modified heavy chain constant region may increase the
rate of internalization and thereby reduce the T.sub.1/2 to 5
minutes (i.e., a two fold increase in rate of internalization or a
two-fold decrease in T.sub.1/2). "T.sub.1/2" is defined as the time
at which half of the maximal internalization is achieved, as
measured from the time the antibody is added to the cells. In
certain embodiments, T.sub.1/2 is reduced by at least 10 minutes,
30 minutes, or 1 hour. The maximal level of internalization can be
the level of internalization at the plateau of a graph representing
the internalization plotted against antibody concentrations or
time. A modified heavy chain constant region may increase the
maximal level of internalization of an antibody by at least 10%,
30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more. Another way of
comparing internalization efficacies of different antibodies, such
as an antibody with, and the same antibody without, a modified
heavy chain constant region, is by comparing their level of
internalization at a given antibody concentration (e.g., 100 nM)
and/or at a given time (e.g., 2 minutes, 5 minutes, 10 minutes or
30 minutes). Comparing levels of internalization can also be done
by comparing the EC.sub.50 levels of internalization. The level of
internalization of one antibody can be defined relative to that of
a given (reference) antibody, e.g., an antibody described herein,
e.g., 11F11 or CD73.4-IgG2CS-IgG1, and, can be indicated as a
percentage of the value obtained with the given (reference)
antibody. The extent of internalization can be enhanced by at least
10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more, as compared by
any one of these methods.
[0152] In certain embodiments, an antibody comprising a modified
heavy chain constant region has more potent agonist activity,
relative to the same antibody that does not comprise a modified
heavy chain constant region, and comprises, e.g., an IgG1 heavy
chain. In certain embodiments, the enhanced agonist activity
enhances the stimulatory activity of a target molecule, e.g., GITR,
or other molecules that stimulate or co-stimulate an immune
response, e.g., T cell activity. In certain embodiments, the
enhanced agonist activity enhances the inhibitory activity of a
target molecule that inhibits an immune response, e.g., T cell
activity (e.g., a checkpoint inhibitor). The enhanced agonist
activity of an antibody that modulates T cell activity can be
determined, e.g., as shown in the Examples, e.g., by measuring the
level of IFN-.gamma. or IL-2 secretion from T cells that are
contacted with the antibody. The agonist activity of an antibody
that binds to a stimulatory target may be enhanced by at least 10%,
30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more as defined by
increased cytokine release or increased proliferation of effector T
cells; reduced T regulatory cell activity if engagement on Tregs
reduces Treg function; or increased depletion of Tregs. For
example, the amount of IFN-.gamma. or IL-2 secreted from T cells
stimulated with an antibody that binds to a stimulatory target
comprising a modified heavy chain constant region may be at least
10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more higher than that
of T cells simulated with the same antibody that does not comprise
a modified heavy chain constant region. The agonist activity of an
antibody that binds to an inhibitory target may be enhanced by at
least 10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more as defined
by reduced cytokine release or reduced proliferation of effector T
cells; increased T regulatory cell activity; or decreased depletion
of Tregs. For example, the amount of IFN-.gamma. or IL-2 secreted
from T cells stimulated with an antibody that binds to an
inhibitory target comprising a modified heavy chain constant region
may be at least 10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more
lower than that of T cells simulated with the same antibody that
does not comprise a modified heavy chain constant region.
[0153] In certain embodiments, an antibody comprising a modified
heavy chain constant region has more potent antagonist or blocking
activity, relative to the same antibody that does not comprise a
modified heavy chain constant region, and comprises, e.g., an IgG1
heavy chain. The enhanced antagonist activity of an antibody can be
determined, e.g., by measuring cytokine release and/or
proliferation in contexts that include conditions of T cell
activation. The antagonist activity may be enhanced by at least
10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more.
[0154] In certain embodiments, an antibody comprising a modified
heavy chain constant region has enhanced ADCC activity, relative to
the same antibody that does not comprise a modified heavy chain
constant region, and comprises, e.g., an IgG1 heavy chain. Enhanced
ADCC may be determined according to methods known in the art. ADCC
may be enhanced by at least 10%, 30%, 50%, 2 fold, 5 fold or
more.
[0155] In certain embodiments, an antibody comprising a modified
heavy chain constant region has the ability to form larger
antibody/antigen cross-linked complexes, relative to the same
antibody that does not comprise a modified heavy chain constant
region, and comprises, e.g., an IgG1 heavy chain. The ability to
form complexes can be determined as described, e.g., in the
Examples. Antibody/antigen complexes formed with an antibody that
comprises a modified heavy chain constant region may be at least
50%, 2 fold, 3 fold, 5 fold or 10 folder larger than complexes
formed with the same antibody that does not comprise a modified
heavy chain constant region. In certain embodiments, complexes of
at least 2,000 kDa; 3,000 kDa; 5000 kDa; 10,000 kDa, 50,000 kDa or
100,000 kDa are formed with antibodies having a modified heavy
chain constant region.
[0156] In certain embodiments, an antibody comprising a modified
heavy chain constant region triggers more clustering or
oligomerization of the target molecule on the cell surface,
relative to the same antibody that does not comprise a modified
heavy chain constant region, and comprises, e.g., an IgG1 heavy
chain. The extent of clustering an oligomerization can be
determined, e.g., by measuring the size of antibody/antigen
complexes.
[0157] In certain embodiments, an antibody comprising a modified
heavy chain constant region transduces a higher level or different
type of signaling or signal transduction, relative to the same
antibody that does not comprise a modified heavy chain constant
region, and comprises, e.g., an IgG1 heavy chain. Signal
transduction can be monitored by determining the level of
activation of one or more proteins in signal transduction pathways.
In certain embodiments, signal transduction is determined by
measuring the activity (or phosphorylation) of a signal
transduction protein, e.g., NKkB or p38, as described, e.g., in the
Examples. Signal transduction triggered by an antibody that
comprises a modified heavy chain constant region may be higher or
lower by at least 10%, 20%, 50%, 2 fold, 5 fold or more than signal
transduction with the same antibody that does not comprise a
modified heavy chain constant region. For example, signal
transduction triggered by an antibody that binds to a stimulatory
molecule (e.g., GITR) and comprises a modified heavy chain constant
region may be enhanced by at least 10% relative to that obtained
with the same antibody having an IgG1 heavy chain. For example,
EC.sub.50 of NKkB or p38 activity (e.g., phosphorylation) may be
reduced by at least 50%, 2 fold, 5 fold or more.
[0158] In certain embodiments, an antibody comprising a modified
heavy chain constant region has an increased ability to stimulate
or enhance an immune response or the immune system, relative to the
same antibody that does not comprise a modified heavy chain
constant region, and comprises, e.g., an IgG1 heavy chain. An
increased ability to stimulate an immune response or the immune
system, can result from an enhanced agonist activity of T cell
costimulatory receptors and/or an enhanced antagonist activity of
inhibitory receptors. An increased ability to stimulate an immune
response or the immune system may be reflected by a fold increase
of the EC.sub.50 or maximal level of activity in an assay that
measures an immune response, e.g., an assay that measures changes
in cytokine or chemokine release, cytolytic activity (determined
directly on target cells or indirectly via detecting CD107a or
granzymes) and proliferation. The ability to stimulate an immune
response or the immune system activity may be enhanced by at least
10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more.
[0159] In certain embodiments, an antibody comprising a modified
heavy chain constant region has an increased anti-proliferative or
anti-tumor activity, relative to the same antibody that does not
comprise a modified heavy chain constant region, and comprises,
e.g., an IgG1 heavy chain. The enhanced anti-tumor activity of an
antibody can be determined, e.g., by the growth of a tumor in an
animal that has been treated with the antibody. The anti-tumor
activity may be enhanced by at least 10%, 30%, 50%, 75%, 2 fold, 3
fold, 5 fold or more. Anti-tumor activity can be measured, e.g., as
a decrease in tumor burden, e.g., manifested by decreased tumor
growth kinetics and complete tumor regressions.
[0160] In certain embodiments, an antibody comprising a modified
heavy chain constant region has an increased ability to inhibit or
suppress an immune response or the immune system, relative to the
same antibody that does not comprise a modified heavy chain
constant region, and comprises, e.g., an IgG1 heavy chain. An
increased ability to inhibit or suppress an immune response or the
immune system, can result from an enhanced antagonist activity of T
cell costimulatory receptors and/or an enhanced agonist activity of
inhibitory receptors. An increased ability to stimulate an immune
response or the immune system may be reflected by a fold increase
of the EC.sub.50 or maximal level of activity in an assay that
measures an immune response, e.g., an assay that measures changes
in cytokine or chemokine release, cytolytic activity (determined
directly on target cells or indirectly via detecting CD107a or
granzymes) and proliferation. The ability to inhibit or suppress an
immune response or the immune system activity may be enhanced by at
least 10%, 30%, 50%, 75%, 2 fold, 3 fold, 5 fold or more.
[0161] In certain embodiments, a modified heavy chain constant
region or portion thereof, e.g., the hinge, is more rigid, compared
to other heavy chain constant regions, e.g., IgG1, IgG2, IgG3
and/or IgG4 heavy chain constant regions. For example, a modified
heavy chain constant region is a non-naturally occurring heavy
chain constant region that is more rigid than, or has a portion,
e.g., the hinge, that is more rigid than a naturally-occurring
heavy chain constant region or hinge thereof. The rigidity of a
heavy chain constant region or portion thereof, such as the hinge,
can be determined by e.g., by computer modeling, electron
microscopy, spectroscopy such as Nuclear Magnetic Resonance (NMR),
X-ray crystallography (B-factors), or Sedimentation Velocity
Analytical ultracentrifugation (AUC) to measure or compare the
radius of gyration of antibodies comprising the hinge.
Alternatively, the rigidity of a heavy chain constant region or
portion thereof can be determined by measuring the sizes of
antibody/antigen complexes, e.g., as further described herein.
[0162] An antibody comprising a modified heavy chain constant
region and exhibiting an enhanced functional property as determined
according to methodologies known in the art and described herein,
will be understood to relate to a statistically significant
difference in the particular activity relative to that seen in the
same antibody but with a different heavy chain constant region.
[0163] In certain embodiments, a modified heavy chain constant
region comprises a hinge of the IgG2 isotype (an "IgG2 hinge") and
a CH1, CH2 and CH3 domain. In certain embodiments, a modified heavy
chain constant region comprises an IgG2 hinge and a CH1, CH2 and
CH3 domain, wherein at least one of the CH1, CH2 and CH3 domains is
not of the IgG2 isotype. In certain embodiments, a modified heavy
chain constant region comprises an IgG2 hinge and a CH1, CH2 and
CH3 domain, wherein the heavy chain constant domain is not a
wild-type IgG2 constant region or is not an IgG2 constant region
with a mutation at amino acid 219 or 220. The IgG2 hinge may be a
wildtype IgG2 hinge, e.g., a wildtype human IgG2 hinge (e.g.,
having SEQ ID NO: 8) or a variant thereof, provided that the IgG2
hinge retains the ability to confer to the antibody an enhanced
activity relative to that of the same antibody that comprises a
non-IgG2 hinge or comprises an IgG1 heavy chain. In certain
embodiments, an IgG2 hinge variant retains similar rigidity or
stiffness to that of a wildtype IgG2 hinge. The rigidity of a hinge
can be determined, e.g., by computer modeling, electron microscopy,
spectroscopy such as Nuclear Magnetic Resonance (NMR), X-ray
crystallography (B-factors), or Sedimentation Velocity Analytical
ultracentrifugation (AUC) to measure or compare the radius of
gyration of antibodies comprising the hinge. A hinge has similar or
higher rigidity relative to that of another hinge if an antibody
comprising the hinge has a value obtained from one of the tests
described in the previous sentence that differs from the value of
the same antibody with a different hinge, e.g., an IgG1 hinge, in
less than 5%, 10%, 25%, 50%, 75%, or 100%. A person of skill in the
art would be able to determine from the tests whether a hinge has
at least similar rigidity to that of another hinge by interpreting
the results of these tests.
[0164] An exemplary human IgG2 hinge variant is an IgG2 hinge that
comprises a substitution of one or more of the four cysteine
residues (i.e., C219, C220, C226 and C229) with another amino acid.
A cysteine may be replaced by a serine. An exemplary IgG2 hinge is
a human IgG2 hinge comprising a C219X mutation ro a C220X mutation,
wherein X is any amino acid except serine. In a certain
embodiments, an IgG2 hinge does not comprise both a C219X and a
C220X substitution. In certain embodiments, an IgG2 hinge comprise
C219S or C220S, but not both C219S and C22S. Other IgG2 hinge
variants that may be used include human IgG2 hinges comprising a
C220, C226 and/or C229 substitution, e.g., a C220S, C226S or C229S
mutation (which may be combined with a C219S mutation). An IgG2
hinge may also be an IgG2 hinge in which a portion of the hinge is
that of another isotype (i.e., it is a chimeric or hybrid hinge),
provided that the rigidity of the chimeric hinge is at least
similar to that of a wildtype IgG2 hinge. For example, an IgG2
hinge may be an IgG2 hinge in which the lower hinge (as defined in
Table 2) is of an IgG1 isotype, and is, e.g., a wildtype IgG1 lower
hinge.
[0165] A "hybrid" or "chimeric" hinge is referred to as being of a
specific isotype if more than half of the consecutive amino acids
of the hinge are from that isotype. For example, a hinge having an
upper and middle hinge of IgG2 and the lower hinge of IgG1 is
considered to be an IgG2 hybrid hinge.
[0166] In certain embodiments, an antibody comprises a modified
heavy chain constant region that comprises an IgG2 hinge comprising
a sequence set forth in Table 4, e.g., one of the following amino
acid sequences: 8, 21, 22, 23, 126-129, and 134-147. In certain
embodiments, the hinge comprises SEQ ID NO: 8, 21, 126, 134 or 135,
wherein 1, 2, 3 or all 4 amino acids P233, V234, A235 and G237
(corresponding to the C-terminal 4 amino acids "PVAG" (SEQ ID NO:
148) are deleted or substituted with another amino acid, e.g., the
amino acids of the C-terminus of the IgG1 hinge (ELLG (SEQ ID NO:
150) or ELLGG (SEQ ID NO: 151). In certain embodiments, the hinge
comprises SEQ ID NO: 8, 21, 126, 134 or 135, wherein V234, A235 and
G237 are deleted or substituted with another amino acid. In certain
embodiments, the hinge comprises SEQ ID NO: 8, 21, 126, 134 or 135,
wherein A235 and G237 are deleted or substituted with another amino
acid. In certain embodiments, the hinge comprises SEQ ID NO: 8, 21,
126, 134 or 135, wherein G237 is deleted or substituted with
another amino acid. In certain embodiments, the hinge comprises SEQ
ID NO: 8, 21, 126, 134 or 135, wherein V234 and A235 are deleted or
substituted with another amino acid. Substitution of PVAG (SEQ ID
NO: 143) in an IgG2 with the corresponding amino acids of an IgG1
hinge, i.e., (ELLG (SEQ ID NO: 150) or ELLGG (SEQ ID NO: 151)) to
obtain a hybrid hinge having SEQ ID NO: 22 or 138 or variants
thereof (see, e.g., Table 4) provides a hinge having the advantages
of an IgG2 hinge and the effector function of IgG1 hinges.
[0167] In certain embodiments, a modified heavy chain constant
region comprises a hinge that consists of or consists essentially
of one of the sequences in Table 4, e.g., SEQ ID NOs: 8, 21, 22,
23, 127-132, and 134-141, and, in certain embodiments, does not
comprise additional hinge amino acid residues.
TABLE-US-00007 TABLE 4 Exemplary IgG2 hinges IgG2 Hinge description
Amino acid sequence SEQ ID NO: Wildtype IgG2 ERKCCVECPPCPAPPVAG 8
IgG2 with C219S ERKSCVECPPCPAPPVAG 21 IgG2 with C220S
ERKCSVECPPCPAPPVAG 126 IgG2 with C219X ERKXCVECPPCPAPPVAG 134 IgG2
with C220X ERKCXVECPPCPAPPVAG 135 Wildtype IgG2 with C-terminal X
ERKCCVECPPCPAPPVAGX 143 IgG2 with C219Swith C-terminal X
ERKSCVECPPCPAPPVAGX 144 IgG2 with C220Swith C-terminal X
ERKCSVECPPCPAPPVAGX 145 IgG2 with C219X with C-terminal X
ERKXCVECPPCPAPPVAGX 146 IgG2 with C220X with C-terminal X
ERKCXVECPPCPAPPVAGX 147 IgG2/IgG1 hybrid ERKCCVECPPCPAPELLGG 22
IgG2/IgG1 hybrid with C219S ERKSCVECPPCPAPELLGG 23 IgG2/IgG1 hybrid
with C220S ERKCSVECPPCPAPELLGG 127 IgG2/IgG1 hybrid with C219X
ERKXCVECPPCPAPELLGG 136 IgG2/IgG1 hybrid with C220X
ERKCXVECPPCPAPELLGG 137 IgG2/IgG1 hybrid deltaG ERKCCVECPPCPAPELLG
138 IgG2/IgG1 hybrid with C219SdeltaG ERKSCVECPPCPAPELLG 139
IgG2/IgG1 hybrid with C220SdeltaG ERKCSVECPPCPAPELLG 140 IgG2/IgG1
hybrid with C219X deltaG ERKXCVECPPCPAPELLG 141 IgG2/IgG1 hybrid
with C220X deltaG ERKCXVECPPCPAPELLG 142 Truncated wiltype IgG2
ERKCCVECPPCPAP 128 Truncated wiltype IgG2 with C219S ERKSCVECPPCPAP
129 Truncated wiltype IgG2 with C220S ERKCSVECPPCPAP 130 Truncated
wiltype IgG2 with C219X ERKXCVECPPCPAP 131 Truncated wiltype IgG2
with C220X ERKCXVECPPCPAP 132
[0168] X is any amino acid, except cysteine.
[0169] In certain embodiments, a modified heavy chain constant
region comprises an IgG2 hinge set forth in Table 4, in which 1-5,
1-3, 1-2 or 1 amino acid is inserted between amino acid residues
CVE and CPP. In certain embodiments, THT or GGG is inserted. In
certain embodiments, 1, 1-2 or 1-3 amino acids may be inserted
between the hinge and CH2 domain. For example, an additional
glycine may be inserted between the hinge and the CH2 domain.
[0170] In certain embodiments a modified heavy chain constant
region is an IgG1 or IgG2 constant region, wherein the hinge
comprises a deletion of 1-10 amino acids. As shown in the Examples,
an IgG1 antibody lacking amino acid residues SCDKTHT (S219, C220,
D221, K222, T223, H224 and T225; SEQ ID NO: 149) conferred antibody
mediated CD73 internalization more effectively than the same
antibody having a wildtype IgG1 constant region. Similarly, in the
context of an IgG2 antibody, an IgG2 antibody lacking amino acid
residues CCVE (C219, C220, V222, and E224; SEQ ID NO: 170)
conferred antibody mediated CD73 internalization more effectively
than the same antibody having a wildtype IgG1 constant region.
Accordingly, provided herein are modified heavy chain constant
region in which the hinge comprises a deletion of 1, 2, 3, 4, 5, 6,
or 7 amino acid residues, selected from residues S219, C220, D221,
K222, T223, H224 and T225 for an IgG1 antibody, and residues C219,
C220, V222, and E224 for an IgG2 antibody.
[0171] In certain embodiments, a modified heavy chain constant
region comprises a CH1 domain that is a wildtype CH1 domain of the
IgG1 or IgG2 isotype ("IgG1 CH1 domain" or "IgG2 CH1 domain,"
respectively). CH1 domains of the isotypes IgG3 and IgG4 ("IgG3 CH1
domain and "IgG2 CH1 domain," respectively) may also be used. A CH1
domain may also be a variant of a wildtype CH1 domain, e.g., a
variant of a wildtype IgG1, IgG2, IgG3 or IgG4 CH1 domain.
Exemplary variants of CH1 domains include A114C, C131S and/or
T173C. A CH1 domain, e.g., an IgG2 CH1 domain, may comprise the
substitution C131S, which substitution confers onto an IgG2
antibody or antibody having an IgG2 CH1 and hinge the B form (or
conformation).
[0172] In certain embodiments, a modified heavy chain constant
region comprises a CH1 domain that is of the IgG2 isotype. In
certain embodiments, the CH1 domain is wildtype IgG2 CH1 domain,
e.g., having the amino acid sequence:
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALTSGVHTFPAVLQSS
GLYSLSSVVTVPSSNFGTQTYTCNVDHKPSNTKVDKTV (SEQ ID NO: 7). In certain
embodiments, the CH1 domain is a variant of SEQ ID NO: 7 and
comprises 1-10, 1-5, 1-2 or 1 amino acid substitutions or deletions
relative to SEQ ID NO: 7. As further described in the Examples, it
has been shown herein that an IgG2 CH1 domain or variants thereof
confer enhanced properties to antibodies relative to IgG1
antibodies and even more enhanced properties when the antibodies
also comprise an IgG2 hinge. In certain embodiments, IgG2 CH1
variants do not comprise an amino acid substitution or deletion at
one or more of the following amino acid residues: C131, R133, E137
and S138, which amino acid residues are shown in bold and
underlined in SEQ ID NO: 7 shown above. For example, a modified
heavy chain constant region may comprise an IgG2 CH1 domain in
which neither of R133, E137 and S138 are substituted with another
amino acid or are deleted or in which neither of C131, R133, E137
and S138 are substituted with another amino acid or are deleted. In
certain embodiments, C131 is substituted with another amino acid,
e.g., C131S, which substitution triggers the antibody to adopt
conformation B. Both conformation A and conformation B antibodies
having modified heavy chain constant regions have been shown herein
to have enhanced activities relative to the same antibody with an
IgG1 constant region.
[0173] In certain embodiments, N192 and/or F193 (shown as
italicized and underlined residues in SEQ ID NO: 7 shown above) are
substituted with another amino acid, e.g., with the corresponding
amino acids in IgG1, i.e., N192S and/or F193L.
[0174] In certain embodiments, one or more amino acid residues of
an IgG2 CH1 domain are substituted with the corresponding amino
acid residues in IgG4. For example, N192 may be N192S; F193 may be
F193L; C131 may be C131K; and/or T214 may be T214R.
[0175] An antibody may comprise a modified heavy chain constant
region comprising an IgG2 CH1 domain or variant thereof and IgG2
hinge or variant thereof. The hinge and CH1 domain may be a
combination of any IgG2 hinge and IgG2 CH1 domain described herein.
In certain embodiments, the IgG2 CH1 and hinge comprise the
following amino acid sequence
TABLE-US-00008 (SEQ ID NO: 133) ##STR00001##
or an amino acid sequence that differs therefrom in at most 1-10
amino acids. The amino acid variants are as described for the hinge
and CH1 domains above.
[0176] In certain embodiments, antibodies comprise at least an IgG2
hinge, and optionally also an IgG2 CH1 domain or fragment or
derivative of the hinge and/or CH1 domain and the antibody has
adopted form (of conformation) A (see, e.g., Allen et al. (2009)
Biochemistry 48:3755). In certain embodiments, antibodies comprise
at least an IgG2 hinge, and optionally also an IgG2 CH1 domain or
fragment or derivative of the hinge and/or CH1 domain and the
antibody has adopted form B (see, e.g., Allen et al. (2009)
Biochemistry 48:3755).
[0177] In certain embodiments, a modified heavy chain constant
region comprises a CH2 domain that is a wildtype CH2 domain of the
IgG1, IgG2, IgG3 or IgG4 isotype ("IgG1 CH2 domain," "IgG2 CH2
domain," "IgG3 CH2 domain," or "IgG4 CH2 domain," respectively. A
CH2 domain may also be a variant of a wildtype CH2 domain, e.g., a
variant of a wildtype IgG1, IgG2, IgG3 or IgG4 CH2 domain.
Exemplary variants of CH2 domains include variants that modulate a
biological activity of the Fc region of an antibody, such as ADCC
or CDC or modulate the half-life of the antibody or its stability.
In one embodiment, the CH2 domain is a human IgG1 CH2 domain with
an A330S and/or P331S mutation, wherein the CH2 domain has reduced
effector function relative to the same CH2 mutation without the
mutations. A CH2 domain may have enhanced effector function. CH2
domains may comprise one or more of the following mutations: SE
(S267E), SELF (S267E/L328F), SDIE (S239D/I332E), SEFF, GASDALIE
(G236A/S239D/A330L/I332E), and/or one or more mutations at the
following amino acids: E233, G237, P238, H268, P271L328 and A330.
Other mutations are further set forth herein elsewhere.
[0178] In certain embodiments, a modified heavy chain constant
region comprises a CH3 domain that is a wildtype CH3 domain of the
IgG1, IgG2, IgG3 or IgG4 isotype ("IgG1 CH3 domain," "IgG2 CH3
domain," "IgG3 CH3 domain," or "IgG4 CH3 domain," respectively. A
CH3 domain may also be a variant of a wildtype CH3 domain, e.g., a
variant of a wildtype IgG1, IgG2, IgG3 or IgG4 CH3 domain.
Exemplary variants of CH3 domains include variants that modulate a
biological activity of the Fc region of an antibody, such as ADCC
or CDC or modulate the half-life of the antibody or its
stability.
[0179] Generally, variants of the CH1, hinge, CH2 or CH3 domains
may comprise 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more mutations,
and/or at most 10, 9, 8, 7, 6, 5, 4, 3, 2 or 1 mutation, or 1-10 or
1-5 mutations, or comprise an amino acid sequence that is at least
about 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99% identical to
that of the corresponding wildtype domain (CH1, hinge, CH2, or CH3
domain, respectively), provided that the heavy chain constant
region comprising the specific variant retains the necessary
biological activity.
[0180] Table 5 sets forth exemplary human heavy chain constant
regions comprising a human CH1, hinge, CH2 and/or CH3 domains,
wherein each domain is either a wildtype domain or a variant
thereof that provides the desired biological activity to the heavy
chain constant region. An unfilled cell in Table 5 indicates that
the domain is present or not, and if present can be of any isotype,
e.g., IgG1, IgG2, IgG3 or IgG4. For example, an antibody comprising
the heavy chain constant region 1 in Table 5 is an antibody that
comprises a heavy chain constant region comprising at least an IgG2
hinge, and which may also comprise a CH1, CH2 and/or CH3 domain,
and if present, which CH1, CH2 and/or CH3 domain is of an IgG1,
IgG2, IgG3 or IgG4 isotype. As another example for understanding
Table 5, an antibody comprising a heavy chain constant region 8 is
an antibody comprising a heavy chain constant region comprising an
IgG1 CH1 domain, and IgG2 hinge, an IgG1 CH2 domain, and which may
or may not also comprise an CH3 domain, which is present, may be of
an IgG1, IgG2, IgG3 or IgG4 isotype.
TABLE-US-00009 TABLE 5 MHCCR* CH1 Hinge CH2 CH3 1 IgG2 2 IgG1 IgG2
3 IgG2 IgG2 4 IgG2 IgG1 5 IgG2 IgG2 6 IgG2 IgG1 7 IgG2 IgG2 8 IgG1
IgG2 IgG1 9 IgG1 IgG2 IgG2 10 IgG2 IgG2 IgG1 11 IgG2 IgG2 IgG2 12
IgG1 IgG2 IgG1 13 IgG1 IgG2 IgG2 14 IgG2 IgG2 IgG1 15 IgG2 IgG2
IgG2 16 IgG2 IgG1 IgG1 17 IgG2 IgG1 IgG2 18 IgG2 IgG2 IgG1 19 IgG2
IgG2 IgG2 20 IgG1 IgG2 IgG1 IgG1 21 IgG1 IgG2 IgG1 IgG2 22 IgG1
IgG2 IgG2 IgG1 23 IgG1 IgG2 IgG2 IgG2 24 IgG2 IgG2 IgG1 IgG1 25
IgG2 IgG2 IgG1 IgG2 26 IgG2 IgG2 IgG2 IgG1 27 IgG2 IgG2 IgG2 IgG2
*Modified heavy chain constant region
[0181] In certain embodiments, an antibody comprising a heavy chain
constant region shown in Table 5 has an enhanced biological
activity relative to the same antibody comprising a heavy chain
constant region that does not comprise that specific heavy chain
constant region or relative to the same antibody that comprises an
IgG1 constant region.
[0182] In certain embodiments, a method for improving the
biological activity of an antibody that comprises a non-IgG2 hinge
and/or non-IgG2 CH1 domain comprises providing an antibody that
comprises a non-IgG2 hinge and/or a non-IgG2 CH1 domain, and
replacing the non-IgG2 hinge and the non-IgG2 CH1 domain with an
IgG2 hinge and an IgG2 CH1 domain, respectively. A method for
improving the biological activity of an antibody that does not
comprise a modified heavy chain constant region, may comprise
providing an antibody that does not comprise a modified heavy chain
constant region, and replacing its heavy chain constant region with
a modified heavy chain constant region.
[0183] Exemplary modified heavy chain constant regions are provided
in Table 6, which sets forth the identity of each of the
domains.
TABLE-US-00010 TABLE 6 SEQ ID Modified heavy NO of chain constant
whole region CH1 Hinge CH2 CH3 MHCCR IgG1-IgG2-IgG1 IgG1 IgG2/IgG1
IgG1 IgG1 SEQ ID wildtype SEQ ID NO: 22 wildtype wildtype NO: 26
SEQ ID SEQ ID NO: 4 SEQ ID NO: 2 NO: 5 IgG1-IgG2-IgG12 IgG1 IgG2
wildtype IgG1 IgG1 SEQ ID wildtype SEQ ID NO: 8 wildtype wildtype
NO: 27 SEQ ID SEQ ID NO: 4 SEQ ID NO: 2 NO: 5 IgG1-IgG2CS-IgG1 IgG1
IgG2C219S/IgG1 IgG1 IgG1 SEQ ID wildtype SEQ ID NO: 23 wildtype
wildtype NO: 32 SEQ ID SEQ ID NO: 4 SEQ ID NO: 2 NO: 5 IgG1-IgG2CS-
IgG1 IgG2 C219S IgG1 IgG1 SEQ ID IgG12 wildtype SEQ ID NO: 21
wildtype wildtype NO: 33 SEQ ID SEQ ID NO: 4 SEQ ID NO: 2 NO: 5
IgG2-IgG1 IgG2 IgG2/IgG1 IgG1 IgG1 SEQ ID wildtype SEQ ID NO: 22
wildtype wildtype NO: 28 SEQ ID SEQ ID NO: 4 SEQ ID NO: 7 NO: 5
IgG2-IgG12 IgG2 IgG2 wildtype IgG1 IgG1 SEQ ID wildtype SEQ ID NO:
8 wildtype wildtype NO: 29 SEQ ID SEQ ID NO: 4 SEQ ID NO: 7 NO: 5
IgG2CS-IgG1 IgG2 IgG2C219S/IgG1 IgG1 IgG1 SEQ ID wildtype SEQ ID
NO: 23 wildtype wildtype NO: 34 SEQ ID SEQ ID NO: 4 SEQ ID NO: 7
NO: 5 IgG2CS-IgG12 IgG2 IgG2 C219S IgG1 IgG1 SEQ ID wildtype SEQ ID
NO: 21 wildtype wildtype NO: 35 SEQ ID SEQ ID NO: 4 SEQ ID NO: 7
NO: 5 IgG1CH1- IgG1 IgG2 wildtype IgG1 IgG1 SEQ ID IgG2Hinge-
wildtype SEQ ID NO: 8 A330S/P331S wildtype NO: 30 IgG1CH2 (A330S,
SEQ ID SEQ ID SEQ ID P3315)-IgG1CH3 NO: 2 NO: 24 NO: 5 or
IgG1-IgG2-IgG1.1 IgG1CH1- IgG1 IgG2 C219S IgG1 IgG1 SEQ ID
IgG2Hinge(C219S)- wildtype SEQ ID NO: 21 A330S/P331S wildtype NO:
36 IgG1CH2(A330S, SEQ ID SEQ ID SEQ ID P331S)-IgG1CH3 NO: 2 NO: 24
NO: 5 or IgG1-IgG2CS- IgG1.1 IgG2-IgG1.1 IgG2 IgG2 wildtype IgG1
IgG1 SEQ ID wildtype SEQ ID NO: 8 A330S/P331S wildtype NO: 31 SEQ
ID SEQ ID SEQ ID NO: 7 NO: 24 NO: 5 IgG2CS-IgG1.1 IgG2 IgG2 C219S
IgG1 IgG1 SEQ ID wildtype SEQ ID NO: 21 A330S/P331S wildtype NO: 37
SEQ ID SEQ ID SEQ ID NO: 7 NO: 24 NO: 5
[0184] In certain embodiments, an antibody comprises a modified
heavy chain constant region comprising an IgG2 hinge comprising any
one of SEQ ID NO: 8, 21, 22, 23, 126-132, 134-136 and 137 or a
variant thereof, such as an IgG2 hinge comprising an amino acid
sequence that (i) differs from any one of SEQ ID NO: 8, 21, 22, 23,
126-132, 134-136 and 137 in 1, 2, 3, 4 or 5 amino acids
substitutions, additions or deletions; (ii) differs from any one of
SEQ ID NO: 8, 21, 22, 23, 126-132, 134-136 and 137 in at most 5, 4,
3, 2, or 1 amino acids substitutions, additions or deletions; (iii)
differs from any one of SEQ ID NO: 8, 21, 22, 23, 126-132, 134-136
and 137 in 1-5, 1-3, 1-2, 2-5 or 3-5 amino acids substitutions,
additions or deletions and/or (iv) comprises an amino acid sequence
that is at least about 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98% or
99% identical to any one of SEQ ID NO: 8, 21, 22, 23, 126-132,
134-136 or 137, wherein in any of (i)-(iv), an amino acid
substitution may be a conservative amino acid substitution or a
non-conservative amino acid substitution; and wherein the modified
heavy chain constant region has an enhanced biological activity
relative to that of another heavy chain constant region, e.g., a
heavy chain constant region that comprises a non-IgG2 hinge or
relative to the same modified heavy chain constant region that
comprises a non-IgG2 hinge.
[0185] In certain embodiments, a hinge comprises a sequence that is
a variant of any one of SEQ ID NO: 8, 21, 22, 23, 126-132, 134-136
and 137, wherein R217 (second amino acid in wildtype IgG2 hinge
(SEQ ID NO: 8) is not deleted or substituted with another amino
acid. In certain embodiments in which a hinge is a variant of any
one of SEQ ID NO: 8, 21, 22, 23, 126-132, 134-136 and 137, the
hinge has a stiffness that is similar to that of wildtype IgG2.
[0186] In certain embodiments, an antibody comprises a modified
heavy chain constant region comprising an IgG1 CH1 domain
comprising SEQ ID NO: 2 or an IgG2 CH1 domain comprising SEQ ID NO:
7, or a variant of SEQ ID NO: 2 or 7, which variant (i) differs
from SEQ ID NO: 2 or 7 in 1, 2, 3, 4 or 5 amino acids
substitutions, additions or deletions; (ii) differs from SEQ ID NO:
2 or 7 in at most 5, 4, 3, 2, or 1 amino acids substitutions,
additions or deletions; (iii) differs from SEQ ID NO: 2 or 7 in
1-5, 1-3, 1-2, 2-5 or 3-5 amino acids substitutions, additions or
deletions and/or (iv) comprises an amino acid sequence that is at
least about 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98% or 99% identical
to SEQ ID NO: 2 or 7, wherein in any of (i)-(iv), an amino acid
substitution may be a conservative amino acid substitution or a
non-conservative amino acid substitution; and wherein the modified
heavy chain constant region has an enhanced biological activity
relative to that of another heavy chain constant region, e.g., a
heavy chain constant region that comprises a non-IgG2 hinge or
relative to the same modified heavy chain constant region that
comprises a non-IgG2 hinge.
[0187] In certain embodiments, an antibody comprises a modified
heavy chain constant region comprising an IgG1 CH2 domain
comprising SEQ ID NO: 4 or 24, or a variant of SEQ ID NO: 4 or 24,
which variant (i) differs from SEQ ID NO: 4 or 24 in 1, 2, 3, 4 or
5 amino acids substitutions, additions or deletions; (ii) differs
from SEQ ID NO: 4 or 24 in at most 5, 4, 3, 2, or 1 amino acids
substitutions, additions or deletions; (iii) differs from SEQ ID
NO: 4 or 24 in 1-5, 1-3, 1-2, 2-5 or 3-5 amino acids substitutions,
additions or deletions and/or (iv) comprises an amino acid sequence
that is at least about 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98% or
99% identical to SEQ ID NO: 4 or 24, wherein in any of (i)-(iv), an
amino acid substitution may be a conservative amino acid
substitution or a non-conservative amino acid substitution; and
wherein the modified heavy chain constant region has an enhanced
biological activity relative to that of another heavy chain
constant region, e.g., a heavy chain constant region that comprises
a non-IgG2 hinge or relative to the same modified heavy chain
constant region that comprises a non-IgG2 hinge.
[0188] In certain embodiments, an antibody comprises a modified
heavy chain constant region comprising an IgG1 CH3 domain
comprising SEQ ID NO: 5, or a variant of SEQ ID NO: 5, which
variant (i) differs from SEQ ID NO: 5 in 1, 2, 3, 4 or 5 amino
acids substitutions, additions or deletions; (ii) differs from SEQ
ID NO: 5 in at most 5, 4, 3, 2, or 1 amino acids substitutions,
additions or deletions; (iii) differs from SEQ ID NO: 5 in 1-5,
1-3, 1-2, 2-5 or 3-5 amino acids substitutions, additions or
deletions and/or (iv) comprises an amino acid sequence that is at
least about 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98% or 99% identical
to SEQ ID NO: 5, wherein in any of (i)-(iv), an amino acid
substitution may be a conservative amino acid substitution or a
non-conservative amino acid substitution; and wherein the modified
heavy chain constant region has an enhanced biological activity
relative to that of another heavy chain constant region, e.g., a
heavy chain constant region that comprises a non-IgG2 hinge or
relative to the same modified heavy chain constant region that
comprises a non-IgG2 hinge.
[0189] Modified heavy chain constant regions may also comprise a
combination of the CH1, hinge, CH2 and CH3 domains described
above.
[0190] In certain embodiments, an antibody comprises a modified
heavy chain constant region described herein or a variant of a
modified heavy chain constant region described herein, which
variant (i) differs from a modified heavy chain constant region
described herein in 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 or more amino
acids substitutions, additions or deletions; (ii) differs from a
modified heavy chain constant region described herein in at most
10, 9, 8, 7, 6, 5, 4, 3, 2, or 1 amino acids substitutions,
additions or deletions; (iii) differs from a modified heavy chain
constant region described herein in 1-5, 1-3, 1-2, 2-5, 3-5, 1-10,
or 5-10 amino acids substitutions, additions or deletions and/or
(iv) comprises an amino acid sequence that is at least about 75%,
80%, 85%, 90%, 95%, 96%, 97%, 98% or 99% identical to a modified
heavy chain constant region described herein, wherein in any of
(i)-(iv), an amino acid substitution may be a conservative amino
acid substitution or a non-conservative amino acid substitution;
and wherein the modified heavy chain constant region has an
enhanced biological activity relative to that of another heavy
chain constant region, e.g., a heavy chain constant region that
comprises a non-IgG2 hinge or relative to the same modified heavy
chain constant region that comprises a non-IgG2 hinge.
[0191] In certain embodiments, an antibody comprises a modified
heavy chain constant region comprising any one of SEQ ID NO: 26-37,
54-56, 78-125 and 152-168 or a variant of any one of SEQ ID NO:
26-37, 54-56, 78-125 and 152-168, which variant (i) differs from
any one of SEQ ID NO: 26-37, 54-56, 78-125 and 152-168 in 1, 2, 3,
4, 5, 6, 7, 8, 9, 10 or more amino acids substitutions, additions
or deletions; (ii) differs from any one of SEQ ID NO: 26-37, 54-56,
78-125 and 152-168 in at most 10, 9, 8, 7, 6, 5, 4, 3, 2, or 1
amino acids substitutions, additions or deletions; (iii) differs
from any one of SEQ ID NO: 26-37, 54-56, 78-125 and 152-168 in 1-5,
1-3, 1-2, 2-5, 3-5, 1-10, or 5-10 amino acids substitutions,
additions or deletions and/or (iv) comprises an amino acid sequence
that is at least about 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98% or
99% identical to any one of SEQ ID NO: 26-37, 54-56, 78-125 and
152-168, wherein in any of (i)-(iv), an amino acid substitution may
be a conservative amino acid substitution or a non-conservative
amino acid substitution; and wherein the modified heavy chain
constant region has an enhanced biological activity relative to
that of another heavy chain constant region, e.g., a heavy chain
constant region that comprises a non-IgG2 hinge or relative to the
same modified heavy chain constant region that comprises a non-IgG2
hinge.
[0192] Modified heavy chain constant regions may have (i) similar,
reduced or increased effector function (e.g., binding to an
Fc.gamma.R) relative to a wildtype heavy chain constant region and
or (ii) similar, reduced or increased half-life (or binding to the
FcRn receptor) relative to a wildtype heavy chain constant
region.
II. Antibodies with Modified Heavy Chain Constant Regions and
Target Antigens Thereof
[0193] Modified heavy chain constant regions can be used in a wide
range of antibodies, such as antibodies that require
internalization (e.g., antibody drug conjugates (ADCs), and
anti-CD73 antibodies), agonist activity (e.g., antibodies that are
effective in modulating immune responses, e.g., in stimulating T
cell activation, such as agonist anti-GITR antibodies), antagonist
activity (e.g., antibodies that inhibit or block a protein that
inhibits an immune response, e.g., T cell activation, such as an
antagonist PD-1 antibody), ADCC, signal transduction, or anti-tumor
activity. For example, internalization of a cell surface inhibitory
receptor may limit its ability to interact with its receptor(s) and
decrease cell function(s).
[0194] In one embodiment, antibodies comprising a modified heavy
chain constant domain are antibodies that require their
internalization for activity (e.g., antibodies that are specific
for cell surface receptors) by, e.g., inducing receptor-mediated
endocytosis when they bind to the cell surface. Such antibodies may
be used as vehicles for targeted delivery of drugs, toxins, enzymes
or DNA for therapeutic applications Therefore, increasing the
internalization properties of these antibodies is desirable.
Exemplary antibodies that may benefit from effective
internalization are antibody drug conjugates. Various assays for
measuring the internalization properties of an antibody are known
in the art and described herein. These assays utilize, for example,
a wide range of dyes for antibody labeling that can be used in wash
or quench-based assays to monitor internalization. Antibody
internalization can also be monitored in no-wash assays which rely
on fluorescent labels.
[0195] In one embodiment, antibodies comprising a modified heavy
chain constant domain are antibodies that require the
internalization of the antigen to which they bind, e.g., a cell
surface molecule, such as a receptor or a ligand, for activity.
Thus, antibodies to cell surface proteins that require to be
downregulated for biological (e.g., therapeutic) activity can use a
modified heavy chain constant region described herein.
[0196] In certain embodiments, antibodies comprising a modified
heavy chain constant domain bind to cell surface molecules and
agonize or antagonize the biological activity of the cell surface
molecule, e.g., a cell surface molecule on an immune cell, e.g., a
T cell, Teff cell, Th1 cell, Th2 cell, CD4+ T cell, CD8+ T cell,
Treg cell, dendritic cell, macrophage, monocyte, Langerhans cell,
NK cell, myeloid derived suppressor cell, B cell or any other
immune cell. The cell surface molecule may be a stimulatory, e.g.,
co-stimulatory molecule (e.g., GITR, OX40, CD137, CD40, ICOS and
other TNFR family members), and the antibody may further stimulate
the activity (an agonist antibody) or the antibody may inhibit the
activity (an antagonist antibody). The cell surface molecule may be
an inhibitory molecule (e.g., CTLA-4, PD-1, PD-L1, LAG-3, TIM-3),
and the antibody may further stimulate the activity (an agonist
antibody) or the antibody may inhibit the activity (an antagonist
antibody).
[0197] In certain embodiments, antibodies comprising a modified
heavy chain constant domain are agonist antibodies of stimulatory
(or co-stimulatory) molecules that, e.g., boost the immune system
of a subject, e.g., by inducing IL-2 and/or IFN-.gamma. secretion
from T cells (e.g., anti-GITR antibodies). Other agonist antibodies
have been shown to activate APCs, promote antitumor T-cell
responses, and/or foster cytotoxic myeloid cells with the potential
to control cancer in the absence of T-cell immunity. Agonist
antibodies of stimulatory molecules are different from antagonist
antibodies of inhibitory molecules, which block negative immune
checkpoint such as anti-CTLA-4 or anti-PD-1. Agonist activity, such
as T cell proliferation, can be measured using a variety of methods
known in the art.
[0198] In certain embodiments, antibodies comprising a modified
heavy chain constant domain are antagonist antibodies of checkpoint
inhibitors boost the immune response of a subject by blocking or
inhibiting negative immune checkpoint, such as anti-CTLA-4 or
anti-PD-1 antibodies, e.g., by targeting the inhibitory receptor
expressed on activated T-cells. Antagonist activity, such as
inhibition of T cell proliferation can be measured using a variety
of methods known in the art.
[0199] In one embodiment, the antibody is (i) an agonist of a
co-stimulatory receptor or (ii) an antagonist of an inhibitory
signal on, e.g., T cells, both of which may result in amplifying
antigen-specific T cell responses (immune checkpoint regulators).
In certain embodiments, an antibody is (i) an antagonist of a
co-stimulatory receptor or (ii) an agonist of an inhibitory signal,
e.g., on T cells. Most of the co-stimulatory and co-inhibitory
molecules are members of the immunoglobulin super family (IgSF),
and antibodies having modified heavy chain constant regions may
bind to any of them. One important family of membrane-bound ligands
that bind to co-stimulatory or co-inhibitory receptors is the B7
family, which includes B7-1, B7-2, B7-H1 (PD-L1), B7-DC (PD-L2),
B7-H2 (ICOS-L), B7-H3, B7-H4, B7-H5 (VISTA), and B7-H6, and
antibodies having modified heavy chain constant regions may bind to
any of them. Another family of membrane bound ligands that bind to
co-stimulatory or co-inhibitory receptors is the TNF family of
molecules that bind to cognate TNF receptor (TNFR) family members,
which include CD40 and CD40L, OX-40, OX-40L, CD70, CD27L, CD30,
CD30L, 4-1BBL, CD137, TRAIL/Apo2-L, TRAILR1/DR4, TRAILR2/DR5,
TRAILR3, TRAILR4, OPG, RANK, RANKL, TWEAKR/Fn14, TWEAK, BAFFR,
EDAR, XEDAR, TACI, APRIL, BCMA, LT.beta.R, LIGHT, DcR3, HVEM,
VEGI/TL1A, TRAMP/DR3, EDAR, EDA1, XEDAR, EDA2, TNFR1, Lymphotoxin
.alpha./TNF.beta., TNFR2, TNF.alpha., LT.alpha., LT.beta.,
LT.beta.R, Lymphotoxin .alpha. 1.beta.2, FAS, FASL (CD178), DR3
(TNFRSF25), RELT, DR6, TROY, NGFR (see, e.g., Tansey (2009) Drug
Discovery Today 00:1). Thus, the antibodies described herein can
bind to any of these surface molecules, and they can be, e.g., (i)
agonists or antagonists (or inhibitors or blocking agents) of
proteins of the IgSF family or B7 family or the TNFR family that
inhibit T cell activation or antagonists of cytokines that inhibit
T cell activation (e.g., IL-6, IL-10, TGF- , VEGF;
"immunosuppressive cytokines") and/or (ii) agonists or antagonists
of stimulatory receptors of the IgSF family, B7 family or the TNF
family or of cytokines that stimulate T cell activation, for
modulating, e.g., stimulating, an immune response, e.g., for
treating proliferative diseases, such as cancer.
[0200] Accordingly, an antibody with a modified heavy chain
constant domain may be used as one of the following agents: [0201]
(1) An agonist of a protein that stimulates, e.g., T cell
activation, such as B7-1, B7-2, CD28, 4-1BB (CD137), 4-1BBL, GITR,
ICOS, ICOS-L, OX40, OX40L, CD70, CD27, CD40, DR3 or CD28H; or
[0202] (2) An antagonist (inhibitor or blocking agent) of a protein
that inhibits T cell activation (e.g., immune checkpoint
inhibitors), such as CTLA-4, PD-1, PD-L1, PD-L2, and LAG-3, as
described above, and any of the following proteins: TIM-3, Galectin
9, CEACAM-1, BTLA, CD69, Galectin-1, TIGIT, CD113, GPR56, VISTA,
2B4, CD48, GARP, CD73, PD1H, LAIR1, TIM-1, TIM-4, CD39.
[0203] Other antibodies include antagonists of inhibitory receptors
on NK cells and agonists of activating receptors on NK cells, e.g.,
KIR, TIGIT, NKG2A.
[0204] Generally, antibodies that may benefit from a modified heavy
chain constant region include, e.g., agonist antibodies that ligate
positive costimulatory receptors, blocking antibodies that
attenuate signaling through inhibitory receptors, antagonist
antibodies, and antibodies that increase systemically the frequency
of anti-tumor T cells, antibodies that overcome distinct immune
suppressive pathways within the tumor microenvironment (e.g., block
inhibitory receptor engagement (e.g., PD-L/PD-1 interactions),
deplete or inhibit Tregs (e.g., an anti-CD25 monoclonal antibody,
inhibit metabolic enzymes such as IDO, or reverse/prevent T cell
anergy or exhaustion) and antibodies that trigger innate immune
activation and/or inflammation at tumor sites. An increased
internalization of inhibitory receptors may translate into a lower
level of a potential inhibitor.
[0205] In certain embodiments, an antibody comprising a modified
heavy chain constant region is an antibody that is conjugated to a
therapeutic agent to form an immunoconjugate, such as an antibody
drug conjugate (ADC), which immunoconjugate requires
internalization for its activity. In an ADC, the antibody functions
as a targeting agent for directing the ADC to a target cell
expressing its antigen, such as an antigen on a cancer cell. In
this case, the antigen may be a tumor associated antigen, i.e., one
that is uniquely expressed or overexpressed by the cancer cell.
Once there, the drug is released, either inside the target cell or
in its vicinity, to act as a therapeutic agent. For a review on the
mechanism of action and use of ADCs in cancer therapy, see Schrama
et al., Nature Rev. Drug Disc. 2006, 5, 147.
[0206] For cancer treatment, the therapeutic agent or drug of an
ADC preferably is a cytotoxic drug that causes death of the
targeted cancer cell. Cytotoxic drugs that can be used in ADCs
include the following types of compounds and their analogs and
derivatives: [0207] (a) enediynes such as calicheamicin (see, e.g.,
Lee et al., J. Am. Chem. Soc. 1987, 109, 3464 and 3466) and
uncialamycin (see, e.g., Davies et al., WO 2007/038868 A2 (2007)
and Chowdari et al., U.S. Pat. No. 8,709,431 B2 (2012)); [0208] (b)
tubulysins (see, e.g., Domling et al., U.S. Pat. No. 7,778,814 B2
(2010); Cheng et al., U.S. Pat. No. 8,394,922 B2 (2013); and Cong
et al., US 2014/0227295 A1; [0209] (c)CC-1065 and duocarmycin (see,
e.g., Boger, U.S. Pat. No. 6,5458,530 B1 (2003); Sufi et al., U.S.
Pat. No. 8,461,117 B2 (2013); and Zhang et al., US 2012/0301490 A1
(2012)); [0210] (d) epothilones (see, e.g., Vite et al., US
2007/0275904 A1 (2007) and U.S. RE42930 E (2011)); [0211] (e)
auristatins (see, e.g., Senter et al., U.S. Pat. No. 6,844,869 B2
(2005) and Doronina et al., U.S. Pat. No. 7,498,298 B2 (2009));
[0212] (f) pyrrolobezodiazepine (PBD) dimers (see, e.g., Howard et
al., US 2013/0059800 A1(2013); US 2013/0028919 A1 (2013); and WO
2013/041606 A1 (2013)); and [0213] (g) maytansinoids such as DM1
and DM4 (see, e.g., Chari et al., U.S. Pat. No. 5,208,020 (1993)
and Amphlett et al., U.S. Pat. No. 7,374,762 B2 (2008)).
[0214] In ADCs, the antibody and therapeutic agent may be
conjugated via a linker, e.g., a cleavable linker, such as a
peptidyl, disulfide, or hydrazone linker. For example, the linker
may be a peptidyl linker such as Val-Cit, Ala-Val, Val-Ala-Val,
Lys-Lys, Pro-Val-Gly-Val-Val (SEQ ID NO: 169), Ala-Asn-Val,
Val-Leu-Lys, Ala-Ala-Asn, Cit-Cit, Val-Lys, Lys, Cit, Ser, or Glu.
The ADCs can be prepared as described in U.S. Pat. Nos. 7,087,600;
6,989,452; and 7,129,261; PCT Publications WO 02/096910; WO
07/038658; WO 07/051081; WO 07/059404; WO 08/083312; and WO
08/103693; U.S. Patent Publications 20060024317; 20060004081; and
20060247295; the disclosures of which are incorporated herein by
reference.
[0215] Exemplary targets of ADCs that may be enhanced with a
modified heavy chain constant region include B7H4 (Korman et al.,
US 2009/0074660 A1); CD19 (Rao-Naik et al., 8,097,703 B2); CD22
(King et al., US 2010/0143368 A1); CD30 (Keler et al., U.S. Pat.
No. 7,387,776 B2 (2008); CD70 (Terrett et al., U.S. Pat. No.
8,124,738 B2); CTLA-4 (Korman et al., U.S. Pat. No. 6,984,720 B1
(2006)); PD-1 (Korman et al., U.S. Pat. No. 8,008,449 B2 (2011);
PSMA (Huang et al., US 2009/0297438 A1 and Cardarelli et al., U.S.
Pat. No. 7,875,278 B2); PTK7 (Terrett et al., US 2010/0034826 A1);
glypican-3 (Terrett et al., US 2010/0209432 (A1)); RG1 (Harkins et
al., U.S. Pat. No. 7,335,748 B2(2008)); mesothelin (Terrett et al.,
U.S. Pat. No. 8,268,970 B2 (2012)); and CD44 (Xu et al., US
2010/0092484 A1).
III. Methods of Enhancing the Biological Activity of Antibodies
[0216] Provided herein are methods for enhancing the biological
activity of certain antibodies, such as the one or more of the
following biological activities: [0217] (a) increased or altered
internalization by a cell; [0218] (b) increased or altered agonist
activity; [0219] (c) increased or altered antagonist or blocking
activity; [0220] (d) enhanced ADCC; [0221] (d) generation of a new
property; [0222] (e) increased or altered signal transduction;
[0223] (f) formation of larger antibody/antigen cross-linked
complexes; [0224] (g) increased clustering or oligomerization of
the target cell surface molecule; [0225] (h) increased stimulation
or enhancement of an immune response; and/or [0226] (i) increased
inhibition of an immune response.
[0227] A method for enhancing a biological activity of an antibody
may comprise replacing the heavy chain constant region or a portion
thereof, e.g., the hinge and/or CH1 domain, with a modified heavy
chain constant region or portion thereof, e.g., an IgG2 hinge
and/or IgG2 CH1 domain.
[0228] In certain embodiments, a method for improving the
biological activity of an antibody comprises (i) providing an
antibody that does not comprise a modified heavy chain constant
region as described herein; and (ii) replacing the heavy chain
constant region of the antibody with a modified heavy chain
constant region, or a portion thereof, that enhances the biological
activity of the antibody. In certain embodiments, a method for
improving the biological activity of an antibody comprises (i)
providing an antibody that comprises a non-IgG2 hinge (e.g., an
IgG1 hinge, an IgG3 hinge or an IgG4 hinge); and (ii) replacing the
non-IgG2 hinge of the antibody with an IgG2 hinge. In certain
embodiments, a method for improving the biological activity of an
antibody comprises (i) providing an antibody that comprises a
non-enhancing IgG2 hinge; and (ii) replacing the non-enhancing IgG2
hinge of the antibody with an IgG2 hinge. A "non-enhancing IgG2
hinge" is a variant IgG2 hinge that differs from an IgG2 hinge in
such a way that it no longer has the required characteristic for
enhancing the biologic activity of an antibody, e.g., a variant
hinge that no longer has the stiffness of a wildtype IgG2
hinge.
[0229] Exemplary methods for enhancing the biological activity of
an antibody comprise (i) providing an antibody that comprises a
non-IgG2 hinge or a non-enhancing IgG2 hinge, and (ii) replacing
the hinge with a hinge comprising SEQ ID NO: 8, 21, 22, 23,
126-132, 134-136 or 137 or variants thereof, e.g., the variants
described herein. Methods for enhancing the biological activity of
an antibody may also comprise (i) providing an antibody that
comprises heavy chain constant region that is not a modified heavy
chain constant region, and (ii) replacing the heavy chain constant
region with a modified heavy chain constant region. Replacing the
heavy chain constant region may comprise replacing the CH1, hinge,
CH2 and/or CH3 domain. For example, a heavy chain constant region
may be modified, by replacing the hinge with an IgG2 hinge or
variant thereof, and/or by replacing the CH1 domain with an IgG1 or
IgG2 CH1 domain or variant thereof. In certain embodiments, the
hinge is replaced with an IgG2 hinge and the CH2 domain is replaced
with an IgG1 CH2 domain. In certain embodiments, the hinge is
replaced with an IgG2 hinge and the CH3 domain is replaced with an
IgG1 CH3 domain. In certain embodiments, the hinge is replaced with
an IgG2 hinge, the CH1 is replaced with an IgG2 hinge, the CH2
domain is replaced with an IgG1 CH2 domain and the CH3 domain is
replaced with an IgG1 CH3 domain. In certain embodiments, a heavy
chain constant region is replaced with a modified heavy chain
regions 1-27 set forth in Table 5 above or the heavy chain constant
regions set forth in Table 6 or described herein.
[0230] Also provided herein are methods for enhancing the
biological activity of an IgG1 or IgG2 antibody, comprising
deleting 1-10 amino acids in the hinge of the IgG1 or IgG2
antibody, respectively. For example, one or more of amino acids
S219, C22, D221, K222, T223, H224 and T225 can be deleted. In one
embodiment, all of amino acids S219, C22, D221, K222, T223, H224
and T225 are deleted.
[0231] Replacing the heavy chain constant region of an antibody to
enhance its biological activity is preferably not accompanied by a
reduction or a significant reduction of its binding activity to the
target antigen. As described in the Examples, substituting the
heavy chain constant region of anti-GITR and anti-CD73 antibodies
did not significantly change their affinity for the human GITR and
human CD73 antigens, respectively.
[0232] It will be understood that when referring to replacing a
domain of a specific isotype with the same domain of a different
isotype, it is not necessary to literally replace the domain, but
rather, it may only be necessary to change the amino acids that are
different between the two isotypes.
[0233] Standard assays to evaluate the binding ability of the
antibodies toward an antigen of various species are known in the
art and are further described herein, and include for example,
ELISAs, Western blots, and RIAs. Suitable assays are described in
detail in the Examples. The binding kinetics (e.g., binding
affinity) of the antibodies also can be assessed by standard assays
known in the art, such as by BIACORE.RTM. SPR analysis. Assays to
evaluate the properties of antibodies having modified constant
regions (e.g., ligand binding, T cell proliferation, cytokine
production) are described in further detail infra and in the
Examples.
[0234] Exemplary antibodies that can be modified as described
herein include, e.g., antibodies for treating cancer, such as:
Yervoy.TM. (ipilimumab) or Tremelimumab (to CTLA-4), galiximab (to
B7.1), BMS-936558 (to PD-1), CT-011 (to PD-1), MK-3475 (to PD-1),
AMP224 (to B7DC), BMS-936559 (to B7-H1), MPDL3280A (to B7-H1),
MEDI-570 (to ICOS), AMG557 (to B7H2), MGA271 (to B7H3), IMP321 (to
LAG-3), BMS-663513 (to CD137), PF-05082566 (to CD137), CDX-1127 (to
CD27), anti-OX40 (Providence Health Services), huMAbOX40L (to
OX40L), Atacicept (to TACI), CP-870893 (to CD40), Lucatumumab (to
CD40), Dacetuzumab (to CD40), Muromonab-CD3 (to CD3), Ipilumumab
(to CTLA-4).
[0235] Other antibodies that can be modified as described herein
include PD-1 and PD-L1 antagonist antibodies. An exemplary
anti-PD-1 antibody that may be modified as described herein is
nivolumab (BMS-936558); an antibody that comprises the CDRs or
variable regions of one of antibodies 17D8, 2D3, 4H1, 5C4, 7D3, 5F4
and 4A11 described in WO 2006/121168; MK-3475 (Lambrolizumab)
described in WO2012/145493; AMP-514 described in WO 2012/145493;
CT-011 (Pidilizumab; previously CT-AcTibody or BAT; see, e.g.,
Rosenblatt et al. (2011) J. Immunotherapy 34:409); those described
in WO 2009/014708, WO 03/099196, WO 2009/114335, WO 2011/066389, WO
2011/161699, WO 2012/145493, WO2013/173223, U.S. Pat. Nos.
7,635,757 and 8,217,149, and U.S. Patent Publication No.
2009/0317368.
[0236] Further antibodies that may be modified include anti-PD-L1
antibodies, e.g., BMS-936559 (referred to as 12A4 in WO 2007/005874
and U.S. Pat. No. 7,943,743); an antibody that comprises the CDRs
or variable regions of 3G10, 12A4, 10A5, 5F8, 10H10, 1B12, 7H1,
11E6, 12B7 and 13G4, which are described in PCT Publication WO
07/005874 and U.S. Pat. No. 7,943,743; MEDI4736 (also known as
Anti-B7-H1); MPDL3280A (also known as RG7446); any of the
anti-PD-L1 antibodies disclosed in WO2013/173223, WO2011/066389,
WO2012/145493, U.S. Pat. Nos. 7,635,757 and 8,217,149 and U.S.
Publication No. 2009/145493.
[0237] Other antibodies that may be modified include anti-CTLA-4
antibodies, e.g., Yervoy.TM. (ipilimumab or antibody 10D1,
described in PCT Publication WO 01/14424); tremelimumab (formerly
ticilimumab, CP-675,206); monoclonal or an anti-CTLA-4 antibody
described in any of the following publications: WO 98/42752; WO
00/37504; U.S. Pat. No. 6,207,156; Hurwitz et al. (1998) Proc.
Natl. Acad. Sci. USA 95(17):10067-10071; Camacho et al. (2004) J.
Clin. Oncology 22(145): Abstract No. 2505 (antibody CP-675206); and
Mokyr et al. (1998) Cancer Res. 58:5301-5304; and any of the
anti-CTLA-4 antibodies disclosed in WO2013/173223.
[0238] Other antibodies that may be modified include anti-LAG-3
antibodies, e.g., BMS-986016; IMP731 described in US 2011/007023;
and IMP-321.
[0239] Other antibodies that may be modified include anti-GITR
agonist antibodies, e.g., the anti-GITR antibody 6C8 or humanized
versions thereof, described in WO2006/105021; an antibody described
in WO2011/028683; and an antibody described in JP2008278814.
[0240] Antibodies that target other antigens, including those
described elsewhere herein, may also be modified. For example,
anti-Her2 antibodies that require internalization, e.g.,
trastuzumab (Herceptin), may be modified as described herein.
IV. Additional Heavy Chain Constant Domain Modifications
[0241] In addition to the modifications described herein to
antibodies to enhance their biological activity, further mutations
can be made, e.g., to the CH1, hinge, CH2 or CH3 domain, to effect,
e.g., the effector function, binding to Fc.gamma.Rs, or stability
of the antibodies.
Fcs and Modified Fcs
[0242] Antibodies described herein may comprise an Fc comprising
one or more modifications, typically to alter one or more
functional properties of the antibody, such as serum half-life,
complement fixation, Fc receptor binding, and/or antigen-dependent
cellular cytotoxicity. For example, one may make modifications in
the Fc region in order to generate an Fc variant with (a) increased
or decreased antibody-dependent cell-mediated cytotoxicity (ADCC),
(b) increased or decreased complement mediated cytotoxicity (CDC),
(c) increased or decreased affinity for Clq and/or (d) increased or
decreased affinity for a Fc receptor relative to the parent Fc.
Such Fc region variants will generally comprise at least one amino
acid modification in the Fc region. Combining amino acid
modifications is thought to be particularly desirable. For example,
the variant Fc region may include two, three, four, five, etc
substitutions therein, e.g. of the specific Fc region positions
identified herein. Exemplary Fc sequence variants are disclosed
herein, and are also provided at U.S. Pat. Nos. 5,624,821;
6,277,375; 6,737,056; 6,194,551; 7,317,091; 8,101,720; PCT Patent
Publications WO 00/42072; WO 01/58957; WO 04/016750; WO 04/029207;
WO 04/035752; WO 04/074455; WO 04/099249; WO 04/063351; WO
05/070963; WO 05/040217, WO 05/092925 and WO 06/020114.
Reducing Effector Function
[0243] ADCC activity may be reduced by modifying the Fc region. In
certain embodiments, sites that affect binding to Fc receptors may
be removed (e.g., by mutation), preferably sites other than salvage
receptor binding sites. In other embodiments, an Fe region may be
modified to remove an ADCC site. ADCC sites are known in the art;
see, for example, Sarmay et al. (1992) Molec. Immunol. 29 (5):
633-9 with regard to ADCC sites in IgG1. In one embodiment, the
G236R and L328R variant of human IgG1 effectively eliminates
Fc.gamma.R binding. Horton et al. (2011) J. Immunol. 186:4223 and
Chu et al. (2008) Mol. Immunol. 45:3926. In other embodiments, the
Fc having reduced binding to Fc.gamma.Rs comprised the amino acid
substitutions L234A, L235E and G237A. Gross et al. (2001) Immunity
15:289.
[0244] CDC activity may also be reduced by modifying the Fe region.
Mutations at IgG1 positions D270, K322, P329 and P331, specifically
alanine mutations D270A, K322A, P329A and P331A, significantly
reduce the ability of the corresponding antibody to bind Clq and
activate complement. Idusogie et al. (2000) J. Immunol. 164:4178;
WO 99/51642. Modification of position 331 of IgG1 (e.g. P331S) has
been shown to reduce complement binding. Tao et al. (1993) J. Exp.
Med. 178:661 and Canfield & Morrison (1991) J. Exp. Med.
173:1483. In another example, one or more amino acid residues
within amino acid positions 231 to 239 are altered to thereby
reduce the ability of the antibody to fix complement. WO
94/29351.
[0245] In some embodiments, the Fc with reduced complement fixation
has the amino acid substitutions A330S and P331S. Gross et al.
(2001) Immunity 15:289.
[0246] For uses where effector function is to be avoided
altogether, e.g. when antigen binding alone is sufficient to
generate the desired therapeutic benefit, and effector function
only leads to (or increases the risk of) undesired side effects,
IgG4 antibodies may be used, or antibodies or fragments lacking the
Fc region or a substantial portion thereof can be devised, or the
Fc may be mutated to eliminate glycosylation altogether (e.g.
N297A). Alternatively, a hybrid construct of human IgG2 (C.sub.H1
domain and hinge region) and human IgG4 (C.sub.H2 and C.sub.H3
domains) has been generated that is devoid of effector function,
lacking the ability to bind the Fc.gamma.Rs (like IgG2) and unable
to activate complement (like IgG4). Rother et al. (2007) Nat.
Biotechnol. 25:1256. See also Mueller et al. (1997) Mol. Immunol.
34:441; Labrijn et al. (2008) Curr. Op. Immunol. 20:479 (discussing
Fc modifications to reduce effector function generally).
[0247] In other embodiments, the Fc region is altered by replacing
at least one amino acid residue with a different amino acid residue
to reduce all effector function(s) of the antibody. For example,
one or more amino acids selected from amino acid residues 234, 235,
236, 237, 297, 318, 320 and 322 can be replaced with a different
amino acid residue such that the antibody has decreased affinity
for an effector ligand but retains the antigen-binding ability of
the parent antibody. The effector ligand to which affinity is
altered can be, for example, an Fc receptor (residues 234, 235,
236, 237, 297) or the C1 component of complement (residues 297,
318, 320, 322). U.S. Pat. Nos. 5,624,821 and 5,648,260, both by
Winter et al.
[0248] WO 88/007089 proposed modifications in the IgG Fc region to
decrease binding to Fc.gamma.RI to decrease ADCC (234A; 235E; 236A;
G237A) or block binding to complement component Clq to eliminate
CDC (E318A or V/K320A and K322A/Q). See also Duncan & Winter
(1988) Nature 332:563; Chappel et al. (1991) Proc. Nat'l Acad. Sci.
(USA) 88:9036; and Sondermann et al. (2000) Nature 406:267
(discussing the effects of these mutations on Fc.gamma.RIII
binding).
[0249] Fc modifications reducing effector function also include
substitutions, insertions, and deletions at positions 234, 235,
236, 237, 267, 269, 325, and 328, such as 234G, 235G, 236R, 237K,
267R, 269R, 325L, and 328R. An Fe variant may comprise 236R/328R.
Other modifications for reducing FcyR and complement interactions
include substitutions 297A, 234A, 235A, 237A, 318A, 228P, 236E,
268Q. 309L, 330S, 331 S, 220S, 226S, 229S, 238S, 233P, and 234V.
These and other modifications are reviewed in Strohl (2009) Current
Opinion in Biotechnology 20:685-691. Effector functions (both ADCC
and complement activation) can be reduced, while maintaining
neonatal FcR binding (maintaining half-life), by mutating IgG
residues at one or more of positions 233-236 and 327-331, such as
E233P, L234V, L235A, optionally G236A, A327G, A330S and P331S in
IgG1; E233P, F234V, L235A, optionally G236A in IgG4; and A330S and
P331S in IgG2. See Armour et al. (1999) Eur. J. Immunol. 29:2613;
WO 99/58572. Other mutations that reduce effector function include
L234A and L235A in IgG1 (Alegre et al. (1994) Transplantation
57:1537); V234A and G237A in IgG2 (Cole et al. (1997) J. Immunol.
159:3613; see also U.S. Pat. No. 5,834,597); and S228P and L235E
for IgG4 (Reddy et al. (2000) J. Immunol. 164:1925). Another
combination of mutations for reducing effector function in a human
IgG1 include L234F, L235E and P331S. Oganesyan et al. (2008) Acta
Crystallogr. D. Biol. Crystallogr. 64:700. See generally Labrijn et
gal. (2008) Curr. Op. Immunol. 20:479. Additional mutations found
to decrease effector function in the context of an Fc (IgG1) fusion
protein (abatacept) are C226S, C229S and P238S (EU residue
numbering). Davis et al. (2007) J. Immunol. 34:2204.
[0250] Other Fc variants having reduced ADCC and/or CDC are
disclosed at Glaesner et al. (2010) Diabetes Metab. Res. Rev.
26:287 (F234A and L235A to decrease ADCC and ADCP in an IgG4);
Hutchins et al. (1995) Proc. Nat'l Acad. Sci. (USA) 92:11980
(F234A, G237A and E318A in an IgG4); An et al. (2009) MAbs 1:572
and U.S. Pat. App. Pub. 2007/0148167 (H268Q, V309L, A330S and P331S
in an IgG2); McEarchern et al. (2007) Blood 109:1185 (C226S, C229S,
E233P, L234V, L235A in an IgG1); Vafa et al. (2014) Methods 65:114
(V234V, G237A, P238S, H268A, V309L, A330S, P331S in an IgG2).
[0251] In certain embodiments, an Fc is chosen that has essentially
no effector function, i.e., it has reduced binding to Fc.gamma.Rs
and reduced complement fixation. An exemplary Fc, e.g., IgG1 Fc,
that is effectorless comprises the following five mutations: L234A,
L235E, G237A, A330S and P331S. Gross et al. (2001) Immunity 15:289.
These five substitutions may be combined with N297A to eliminate
glycosylation as well.
Enhancing Effector Function
[0252] Alternatively, ADCC activity may be increased by modifying
the Fc region. With regard to ADCC activity, human IgG1
.quadrature. IgG3 .quadrature. IgG4 .quadrature. IgG2, so an IgG1
constant domain, rather than an IgG2 or IgG4, might be chosen for
use in a drug where ADCC is desired. Alternatively, the Fc region
may be modified to increase antibody dependent cellular
cytotoxicity (ADCC) and/or to increase the affinity for an
Fc.gamma. receptor by modifying one or more amino acids at the
following positions: 234, 235, 236, 238, 239, 240, 241, 243, 244,
245, 247, 248, 249, 252, 254, 255, 256, 258, 262, 263, 264, 265,
267, 268, 269, 270, 272, 276, 278, 280, 283, 285, 286, 289, 290,
292, 293, 294, 295, 296, 298, 299, 301, 303, 305, 307, 309, 312,
313, 315, 320, 322, 324, 325, 326, 327, 329, 330, 331, 332, 333,
334, 335, 337, 338, 340, 360, 373, 376, 378, 382, 388, 389, 398,
414, 416, 419, 430, 433, 434, 435, 436, 437, 438 or 439. See WO
2012/142515; see also WO 00/42072. Exemplary substitutions include
236A, 239D, 239E, 268D, 267E, 268E, 268F, 324T, 332D, and 332E.
Exemplary variants include 239D/332E, 236A/332E, 236A/239D/332E,
268F/324T, 267E/268F, 267E/324T, and 267E/268F/324T. For example,
human IgG1Fcs comprising the G236A variant, which can optionally be
combined with 1332E, have been shown to increase the
Fc.gamma.IIA/Fc.gamma.IIB binding affinity ratio approximately
15-fold. Richards et al. (2008) Mol. Cancer Therap. 7:2517; Moore
et al. (2010) mAbs 2:181. Other modifications for enhancing
Fc.gamma.R and complement interactions include but are not limited
to substitutions 298A, 333A, 334A, 326A, 2471, 339D, 339Q, 280-1,
290S, 298D, 298V, 243L, 292P, 300L, 396L, 3051, and 396L. These and
other modifications are reviewed in Strohl (2009) Current Opinion
in Biotechnology 20:685-691. Specifically, both ADCC and CDC may be
enhanced by changes at position E333 of IgG1, e.g. E333A. Shields
et al. (2001) J. Biol. Chem. 276:6591. The use of P247I and A339D/Q
mutations to enhance effector function in an IgG1 is disclosed at
WO 2006/020114, and D280H, K290S.+-.S298D/V is disclosed at WO
2004/074455. The K326A/W and E333A/S variants have been shown to
increase effector function in human IgG1, and E333S in IgG2.
Idusogie et al. (2001) J. Immunol. 166:2571.
[0253] Specifically, the binding sites on human IgG1 for
Fc.gamma.RI, Fc.gamma.RII, Fc.gamma.RIII and FcRn have been mapped,
and variants with improved binding have been described. Shields et
al. (2001) J. Biol. Chem. 276:6591-6604. Specific mutations at
positions 256, 290, 298, 333, 334 and 339 were shown to improve
binding to Fc.gamma.RIII, including the combination mutants
T256A/S298A, S298A/E333A, S298A/K224A and S298A/E333A/K334A (having
enhanced Fc.gamma.RIIIa binding and ADCC activity). Other IgG1
variants with strongly enhanced binding to Fc.gamma.RIIIa have been
identified, including variants with S239D/I332E and
S239D/I332E/A330L mutations which showed the greatest increase in
affinity for Fc.gamma.RIIIa, a decrease in Fc.gamma.RIIb binding,
and strong cytotoxic activity in cynomolgus monkeys. Lazar et al.
(2006) Proc. Nat'l Acad Sci. (USA) 103:4005; Awan et al. (2010)
Blood 115:1204; Desjarlais & Lazar (2011) Exp. Cell Res.
317:1278. Introduction of the triple mutations into antibodies such
as alemtuzumab (CD52-specific), trastuzumab (HER2/neu-specific),
rituximab (CD20-specific), and cetuximab (EGFR-specific) translated
into greatly enhanced ADCC activity in vitro, and the S239D/I332E
variant showed an enhanced capacity to deplete B cells in monkeys.
Lazar et al. (2006) Proc. Nat'l Acad Sci. (USA) 103:4005. In
addition, IgG1 mutants containing L235V, F243L, R292P, Y300L, V305I
and P396L mutations which exhibited enhanced binding to
Fc.gamma.RIIIa and concomitantly enhanced ADCC activity in
transgenic mice expressing human Fc.gamma.RIIIa in models of B cell
malignancies and breast cancer have been identified. Stavenhagen et
al. (2007) Cancer Res. 67:8882; U.S. Pat. No. 8,652,466; Nordstrom
et al. (2011) Breast Cancer Res. 13:R123.
[0254] Different IgG isotypes also exhibit differential CDC
activity (IgG3>IgG1>>IgG2.apprxeq.IgG4). Dangl et al.
(1988) EMBO J. 7:1989. For uses in which enhanced CDC is desired,
it is also possible to introduce mutations that increase binding to
Clq. The ability to recruit complement (CDC) may be enhanced by
mutations at K326 and/or E333 in an IgG2, such as K326W (which
reduces ADCC activity) and E333S, to increase binding to Clq, the
first component of the complement cascade. Idusogie et al. (2001)
J. Immunol. 166:2571. Introduction of S267E/H268F/S324T (alone or
in any combination) into human IgG1 enhances Clq binding. Moore et
al. (2010) mAbs 2:181. The Fc region of the IgG1/IgG3 hybrid
isotype antibody "113F" of Natsume et al. (2008) Cancer Res.
68:3863 (FIG. 1 therein) also confers enhanced CDC. See also
Michaelsen et al. (2009) Scand. J. Immunol. 70:553 and Redpath et
al. (1998) Immunology 93:595.
[0255] Additional mutations that can increase or decrease effector
function are disclosed at Dall'Acqua et al. (2006) J. Immunol.
177:1129. See also Carter (2006) Nat. Rev. Immunol. 6:343; Presta
(2008) Curr. Op. Immunol. 20:460.
[0256] Fc variants that enhance affinity for the inhibitory
receptor Fc.gamma.RIIb may also be used, e.g. to enhance
apoptosis-inducing or adjuvant activity. Li & Ravetch (2011)
Science 333:1030; Li & Ravetch (2012) Proc. Nat'l Acad. Sci
(USA) 109:10966; U.S. Pat. App. Pub. 2014/0010812. Such variants
may provide an antibody with immunomodulatory activities related to
Fc.gamma.RIIb.sup.+ cells, including for example B cells and
monocytes. In one embodiment, the Fc variants provide selectively
enhanced affinity to FcyRIIb relative to one or more activating
receptors. Modifications for altering binding to FcyRIIb include
one or more modifications at a position selected from the group
consisting of 234, 235, 236, 237, 239, 266, 267, 268, 325, 326,
327, 328, and 332, according to the EU index. Exemplary
substitutions for enhancing FcyRIIb affinity include but are not
limited to 234D, 234E, 234F, 234W, 235D, 235F, 235R, 235Y, 236D,
236N, 237), 237N, 239), 239E, 266M, 267D), 267E, 268D, 268E, 327D,
327E, 3281F, 328W, 328Y, and 332E. Exemplary substitutions include
235Y, 236D, 239D, 266M, 267E, 268D, 268E, 328F, 328W, and 328Y.
Other Fc variants for enhancing binding to FcyRIIb include
235Y/267E, 236/D267E. 239D/268D, 239D/267E, 267E/268D, 267E/268E,
and 267E/328F. Specifically, the S267E, G236D, S239D, L328F and
I332E variants, including the S267E+L328F double variant, of human
IgG1 are of particular value in specifically enhancing affinity for
the inhibitory FcyRIIb receptor. Chu et al. (2008) Mol. Immunol.
45:3926; U.S. Pat. App. Pub. 2006/024298; WO 2012/087928. Enhanced
specificity for Fc.gamma.RIIb (as distinguished from
Fc.gamma.RIIa.sup.R131) may be obtained by adding the P238D
substitution. Mimoto et al. (2013) Protein. Eng. Des. &
Selection 26:589; WO 2012/115241.
Glycosylation
[0257] Glycosylation of an antibody is modified to increase or
decrease effector function. For example, an aglycoslated antibody
can be made that lacks all effector function by mutating the
conserved asparagine residue at position 297 (e.g. N297A), thus
abolishing complement and Fc.gamma.RI binding. Bolt et al. (1993)
Eur. J. Immunol. 23:403. See also Tao & Morrison (1989) J.
Immunol. 143:2595 (using N297Q in IgG1 to eliminate glycosylation
at position 297).
[0258] Although aglycosylated antibodies generally lack effector
function, mutations can be introduced to restore that function.
Aglycosylated antibodies, e.g. those resulting from N297A/C/D/or H
mutations or produced in systems (e.g. E. coli) that do not
glycosylate proteins, can be further mutated to restore Fc.gamma.R
binding, e.g. S298G and/or T299A/G/or H (WO 2009/079242), or E382V
and M428I (Jung et al. (2010) Proc. Nat'l Acad. Sci (USA)
107:604).
[0259] Additionally, an antibody with enhanced ADCC can be made by
altering the glycosylation. For example, removal of fucose from
heavy chain Asn297-linked oligosaccharides has been shown to
enhance ADCC, based on improved binding to Fc.gamma.RIIIa. Shields
et al. (2002) JBC 277:26733; Niwa et al. (2005) J. Immunol. Methods
306: 151; Cardarelli et al. (2009) Clin. Cancer Res.15:3376
(MDX-1401); Cardarelli et al. (2010) Cancer Immunol. Immunotherap.
59:257 (MDX-1342). Such low fucose antibodies may be produced,
e.g., in knockout Chinese hamster ovary (CHO) cells lacking
fucosyltransferase (FUT8) (Yamane-Ohnuki et al. (2004) Biotechnol.
Bioeng. 87:614), or in other cells that generate afucosylated
antibodies. See, e.g., Zhang et al. (2011) mAbs 3:289 and Li et al.
(2006) Nat. Biotechnol. 24:210 (both describing antibody production
in glycoengineered Pichia pastoris); Mossner et al. (2010) Blood
115:4393; Shields et al. (2002) J. Biol. Chem. 277:26733; Shinkawa
et al. (2003) J. Biol. Chem. 278:3466; EP 1176195B1. ADCC can also
be enhanced as described in PCT Publication WO 03/035835, which
discloses use of a variant CHO cell line, Lec13, with reduced
ability to attach fucose to Asn(297)-linked carbohydrates, also
resulting in hypofucosylation of antibodies expressed in that host
cell (see also Shields, R. L. et al. (2002) J. Biol. Chem.
277:26733-26740). Alternatively, fucose analogs may be added to
culture medium during antibody production to inhibit incorporation
of fucose into the carbohydrate on the antibody. WO
2009/135181.
[0260] Increasing bisecting GlcNac structures in antibody-linked
oligosaccharides also enhances ADCC. PCT Publication WO 99/54342 by
Umana et al. describes cell lines engineered to express
glycoprotein-modifying glycosyl transferases (e.g.,
beta(1,4)-N-acetylglucosaminyltransferase III (GnTIII)) such that
antibodies expressed in the engineered cell lines exhibit increased
bisecting GlcNac structures which results in increased ADCC
activity of the antibodies (see also Umana et al. (1999) Nat.
Biotech. 17:176-180).
[0261] Additional glycosylation variants have been developed that
are devoid of galactose, sialic acid, fucose and xylose residues
(so-called GNGN glycoforms), which exhibit enhanced ADCC and ADCP
but decreased CDC, as well as others that are devoid of sialic
acid, fucose and xylose (so-called G1/G2 glycoforms), which exhibit
enhanced ADCC, ADCP and CDC. U.S. Pat. App. Pub. No. 2013/0149300.
Antibodies having these glycosylation patterns are optionally
produced in genetically modified N. benthamiana plants in which the
endogenous xylosyl and fucosyl transferase genes have been
knocked-out.
[0262] Glycoengineering can also be used to modify the
anti-inflammatory properties of an IgG construct by changing the
.alpha.2,6 sialyl content of the carbohydrate chains attached at
Asn297 of the Fc regions, wherein an increased proportion of
.alpha.2,6 sialylated forms results in enhanced anti-inflammatory
effects. See Nimmerjahn et al. (2008) Ann. Rev. Immunol. 26:513.
Conversely, reduction in the proportion of antibodies having
.alpha.2,6 sialylated carbohydrates may be useful in cases where
anti-inflammatory properties are not wanted. Methods of modifying
.alpha.2,6 sialylation content of antibodies, for example by
selective purification of .alpha.2,6 sialylated forms or by
enzymatic modification, are provided at U.S. Pat. Appl. Pub. No.
2008/0206246. In other embodiments, the amino acid sequence of the
Fc region may be modified to mimic the effect of .alpha.2,6
sialylation, for example by inclusion of an F241A modification. WO
2013/095966.
[0263] Antibodies described herein can contain one or more
glycosylation sites in either the light or heavy chain variable
region. Such glycosylation sites may result in increased
immunogenicity of the antibody or an alteration of the pK of the
antibody due to altered antigen binding (Marshall et al (1972) Annu
Rev Biochem 41:673-702; Gala and Morrison (2004) J. Immunol
172:5489-94; Wallick et al (1988) J Exp Med 168:1099-109; Spiro
(2002) Glycobiology 12:43R-56R; Parekh et al (1985) Nature
316:452-7; Mimura et al. (2000) Mol Immunol 37:697-706).
Glycosylation has been known to occur at motifs containing an
N-X-S/T sequence.
Biological Half-Life
[0264] In certain embodiments, the antibody is modified to increase
its biological half-life. Various approaches are possible. For
example, this may be done by increasing the binding affinity of the
Fc region for FcRn. In one embodiment, the antibody is altered
within the CH1 or CL region to contain a salvage receptor binding
epitope taken from two loops of a CH2 domain of an Fc region of an
IgG, as described in U.S. Pat. Nos. 5,869,046 and 6,121,022 by
Presta et al. Other exemplary Fc variants that increase binding to
FcRn and/or improve pharmacokinetic properties include
substitutions at positions 259, 308, and 434, including for example
2591, 308F, 428L, 428M, 434S, 434-1, 434F, 434Y, and 434M. Other
variants that increase Fc binding to FcRn include: 250E, 250Q,
428L, 428F, 250Q/428L (Hinton et al., 2004, J. Biol. Chem. 279(8):
6213-6216, Hinton et al. 2006 Journal of Immunology 176:346-356),
256A, 272A, 305A, 307A, 311A, 312A, 378Q, 380A, 382A, 434A (Shields
et al, Journal of Biological Chemistry, 2001, 276(9):6591-6604),
252F, 252Y, 252W, 254T, 256Q, 256E, 256D, 433R, 434F, 434Y,
252Y/254T/256E, 433K/434F/436H (Del' Acqua et al. Journal of
Immunology, 2002, 169:5171-5180, Dall'Acqua et al., 2006, Journal
of Biological Chemistry 281:23514-23524). See U.S. Pat. No.
8,367,805.
[0265] Modification of certain conserved residues in IgG Fc
(1253/H310/Q311/H433/N434), such as the N434A variant (Yeung et al.
(2009) J. Immunol. 182:7663), has been proposed as a way to
increase FcRn affinity, thus increasing the half-life of the
antibody in circulation. WO 98/023289. The combination Fc variant
comprising M428L and N434S has been shown to increase FcRn binding
and increase serum half-life up to five-fold. Zalevsky et al.
(2010) Nat. Biotechnol. 28:157. The combination Fc variant
comprising T307A, E380A and N434A modifications also extends
half-life of IgG1 antibodies. Petkova et al. (2006) Int. Immmunol.
18:1759. In addition, combination Fc variants comprising
M252Y/M428L, M428L/N434H, M428L/N434F, M428L/N434Y, M428L/N434A,
M428N434M, and M428L/N434M and M428L/N434S variants have also been
shown to extend half-life. WO 2009/086320.
[0266] Further, a combination Fe variant comprising M252Y, S254T
and T256E, increases half-life-nearly 4-fold. Dall'Acqua et al.
(2006) J. Biol. Chem. 281:23514. A related IgG1 modification
providing increased FcRn affinity but reduced pH dependence
(M252Y/S254T/T256E/1-433K/N434F) has been used to create an IgG1
construct ("MST-HN Abdeg") for use as a competitor to prevent
binding of other antibodies to FcRn, resulting in increased
clearance of that other antibody, either endogenous IgG (e.g. in an
autoimmune setting) or another exogenous (therapeutic) mAb. Vaccaro
et al. (2005) Nat. Biotechnol. 23:1283; WO 2006/130834.
[0267] Other modifications for increasing FcRn binding are
described in Yeung et al. (2010) J. Immunol. 182:7663-7671;
6,277,375; 6,821,505; WO 97/34631: WO 2002/060919.
[0268] In certain embodiments, hybrid IgG isotypes may be used to
increase FcRn binding, and potentially increase half-life. For
example, an IgG1/IgG3 hybrid variant may be constructed by
substituting IgG1 positions in the CH2 and/or CH3 region with the
amino acids from IgG3 at positions where the two isotypes differ.
Thus a hybrid variant IgG antibody may be constructed that
comprises one or more substitutions, e.g., 274Q, 276K, 300F, 339T,
356E, 358M, 384S, 392N, 397M, 4221, 435R, and 436F. In other
embodiments described herein, an IgG1/IgG2 hybrid variant may be
constructed by substituting IgG2 positions in the CH2 and/or CH3
region with amino acids from IgG1 at positions where the two
isotypes differ. Thus a hybrid variant IgG antibody may be
constructed that comprises one or more substitutions, e.g., one or
more of the following amino acid substitutions: 233E, 234L, 235L,
236G (referring to an insertion of a glycine at position 236), and
327A. See U.S. Pat. No. 8,629,113. A hybrid of IgG1/IgG2/IgG4
sequences has been generated that purportedly increases serum
half-life and improves expression. U.S. Pat. No. 7,867,491
(sequence number 18 therein).
[0269] The serum half-life of the antibodies of the present
invention can also be increased by pegylation. An antibody can be
pegylated to, for example, increase the biological (e.g., serum)
half-life of the antibody. To pegylate an antibody, the antibody,
or fragment thereof, typically is reacted with a polyethylene
glycol (PEG) reagent, such as a reactive ester or aldehyde
derivative of PEG, under conditions in which one or more PEG groups
become attached to the antibody or antibody fragment. Preferably,
the pegylation is carried out via an acylation reaction or an
alkylation reaction with a reactive PEG molecule (or an analogous
reactive water-soluble polymer). As used herein, the term
"polyethylene glycol" is intended to encompass any of the forms of
PEG that have been used to derivatize other proteins, such as mono
(C1-C10) alkoxy- or aryloxy-polyethylene glycol or polyethylene
glycol-maleimide. In certain embodiments, the antibody to be
pegylated is an aglycosylated antibody. Methods for pegylating
proteins are known in the art and can be applied to the antibodies
described herein. See for example, EP 0154316 by Nishimura et al.
and EP 0401384 by Ishikawa et al.
[0270] Alternatively, under some circumstances it may be desirable
to decrease the half-life of an antibody of the present invention,
rather than increase it. Modifications such as I253A (Hornick et
al. (2000) J. Nucl. Med. 41:355) and H435A/R I253A or H310A (Kim et
al. (2000) Eur. J. Immunol. 29:2819) in Fc of human IgG1 can
decrease FcRn binding, thus decreasing half-life (increasing
clearance) for use in situations where rapid clearance is
preferred, such a medical imaging. See also Kenanova et al. (2005)
Cancer Res. 65:622. Other means to enhance clearance include
formatting the antigen binding domains of the present invention as
antibody fragments lacking the ability to bind FcRn, such as Fab
fragments. Such modification can reduce the circulating half-life
of an antibody from a couple of weeks to a matter of hours.
Selective PEGylation of antibody fragments can then be used to
fine-tune (increase) the half-life of the antibody fragments if
necessary. Chapman et al. (1999) Nat. Biotechnol. 17:780. Antibody
fragments may also be fused to human serum albumin, e.g. in a
fusion protein construct, to increase half-life. Yeh et al. (1992)
Proc. Nat'l Acad. Sci. 89:1904. Alternatively, a bispecific
antibody may be constructed with a first antigen binding domain of
the present invention and a second antigen binding domain that
binds to human serum albumin (HSA). See Int'l Pat. Appl. Pub. WO
2009/127691 and patent references cited therein. Alternatively,
specialized polypeptide sequences can be added to antibody
fragments to increase half-life, e.g. "XTEN" polypeptide sequences.
Schellenberger et al. (2009) Nat. Biotechnol. 27:1186; Int'l Pat.
Appl. Pub. WO 2010/091122.
Stability
[0271] A potential protease cleavage site in the hinge of IgG1
constructs can be eliminated by D221G and K222S modifications,
increasing the stability of the antibody. WO 2014/043344.
[0272] In certain embodiments, the antibodies described herein do
not contain asparagine isomerism sites. The deamidation of
asparagine may occur on N-G or D-G sequences and may result in the
creation of an isoaspartic acid residue that may introduce a kink
into the polypeptide chain and may decrease its stability
(isoaspartic acid effect).
[0273] Each antibody will have a unique isoelectric point (pI),
which generally falls in the pH range between 6 and 9.5. The pI for
an IgG1 antibody typically falls within the pH range of 7-9.5 and
the pI for an IgG4 antibody typically falls within the pH range of
6-8. There is speculation that antibodies with a pI outside the
normal range may have some unfolding and instability under in vivo
conditions. Thus, it is preferred to have an antibody that contains
a pI value that falls in the normal range. This can be achieved
either by selecting antibodies with a pI in the normal range or by
mutating charged surface residues.
[0274] Each antibody will have a characteristic melting
temperature, with a higher melting temperature indicating greater
overall stability in vivo (Krishnamurthy R and Manning M C (2002)
Curr Pharm Biotechnol 3:361-71). Generally, it is preferred that
the T.sub.M1 (the temperature of initial unfolding) be greater than
60.degree. C., preferably greater than 65.degree. C., even more
preferably greater than 70.degree. C. The melting point of an
antibody can be measured using differential scanning calorimetry
(Chen et al (2003) Pharm Res 20:1952-60; Ghirlando et al (1999)
Immunol Lett 68:47-52) or circular dichroism (Murray et al. (2002)
J. Chromatogr Sci 40:343-9).
[0275] In a preferred embodiment, antibodies are selected that do
not degrade rapidly. Degradation of an antibody can be measured
using capillary electrophoresis (CE) and MALDI-MS (Alexander A J
and Hughes D E (1995) Anal Chem 67:3626-32).
[0276] When using an IgG4 constant domain, it is usually preferable
to include the substitution S228P, which mimics the hinge sequence
in IgG1 and thereby stabilizes IgG4 molecules, e.g. reducing
Fab-arm exchange between the therapeutic antibody and endogenous
IgG4 in the patient being treated. Labrijn et al. (2009) Nat.
Biotechnol. 27:767; Reddy et al. (2000) J. Immunol. 164:1925.
Similarly, in IgG2 hinge containing antibodies a C219S and/or C220S
mutation stabilizes the antibody comprising an IgG2 hinge.
Aggregation
[0277] In another preferred embodiment, antibodies are selected
that have minimal aggregation effects, which can lead to the
triggering of an unwanted immune response and/or altered or
unfavorable pharmacokinetic properties. Generally, antibodies are
acceptable with aggregation of 25% or less, preferably 20% or less,
even more preferably 15% or less, even more preferably 10% or less
and even more preferably 5% or less. Aggregation can be measured by
several techniques, including size-exclusion column (SEC), high
performance liquid chromatography (HPLC), and light scattering.
V. Non-Antibody Proteins and Antibody Derivatives
[0278] The invention described herein may also be applied to
molecules that are not full length antibodies, provided that they
comprise a hinge. For example, IgG fusion proteins with an enhanced
biologic activity may be made. Accordingly, provided herein are
fusion proteins comprising an active moiety linked, e.g.,
covalently linked, to an IgG constant region, e.g., an Fc region,
comprising an IgG2 hinge and optionally a CH2 and CH3 domains or
portions thereof. The Fc may be any Fc of a modified heavy chain
constant region described herein, such as the Fc portions of the
modified heavy chain constant regions set forth in Tables 5 and
6.
[0279] Antibodies described herein may also be used for forming
bispecific molecules. An antibody, or antigen-binding portions
thereof, can be derivatized or linked to another functional
molecule, e.g., another peptide or protein (e.g., another antibody
or ligand for a receptor) to generate a bispecific molecule that
binds to at least two different binding sites or target molecules.
Antibodies described herein may be derivatized or linked to more
than one other functional molecule to generate multispecific
molecules that bind to more than two different binding sites and/or
target molecules; such multispecific molecules are also intended to
be encompassed by the term "bispecific molecule" as used herein. To
create a bispecific molecule, an antibody described herein can be
functionally linked (e.g., by chemical coupling, genetic fusion,
noncovalent association or otherwise) to one or more other binding
molecules, such as another antibody, antibody fragment, peptide or
binding mimetic, such that a bispecific molecule results.
VI. Compositions
[0280] Further provided are compositions, e.g., a pharmaceutical
compositions, containing one or a combination of antibodies, or
antigen-binding portion(s) thereof, described herein, formulated
together with a pharmaceutically acceptable carrier. Such
compositions may include one or a combination of (e.g., two or more
different) antibodies, or immunoconjugates or bispecific molecules
described herein. For example, a pharmaceutical composition
described herein can comprise a combination of antibodies (or
immunoconjugates or bispecifics) that bind to different epitopes on
the target antigen or that have complementary activities.
[0281] In certain embodiments, a composition comprises an antibody
described herein at a concentration of at least 1 mg/ml, 5 mg/ml,
10 mg/ml, 50 mg/ml, 100 mg/ml, 150 mg/ml, 200 mg/ml, 1-300 mg/ml,
or 100-300 mg/ml.
[0282] Pharmaceutical compositions described herein also can be
administered in combination therapy, i.e., combined with other
agents. For example, the combination therapy can include an
antibody described herein combined with at least one other
anti-cancer and/or T-cell stimulating (e.g., activating) agent.
Examples of therapeutic agents that can be used in combination
therapy are described in greater detail below in the section on
uses of the antibodies described herein.
[0283] In some embodiments, therapeutic compositions disclosed
herein can include other compounds, drugs, and/or agents used for
the treatment of cancer. Such compounds, drugs, and/or agents can
include, for example, chemotherapy drugs, small molecule drugs or
antibodies that stimulate the immune response to a given cancer. In
some instances, therapeutic compositions can include, for example,
one or more of an anti-CTLA-4 antibody, an anti-PD-1 antibody, an
anti-PDL-1 antibody, an anti-OX40 (also known as CD134, TNFRSF4,
ACT35 and/or TXGP1L) antibody, or an anti-LAG-3 antibody.
[0284] As used herein, "pharmaceutically acceptable carrier"
includes any and all solvents, dispersion media, coatings,
antibacterial and antifungal agents, isotonic and absorption
delaying agents, and the like that are physiologically compatible.
Preferably, the carrier is suitable for intravenous, intramuscular,
subcutaneous, parenteral, spinal or epidermal administration (e.g.,
by injection or infusion). Depending on the route of
administration, the active compound, i.e., antibody,
immunoconjugate, or bispecific molecule, may be coated in a
material to protect the compound from the action of acids and other
natural conditions that may inactivate the compound.
[0285] The pharmaceutical compounds described herein may include
one or more pharmaceutically acceptable salts. A "pharmaceutically
acceptable salt" refers to a salt that retains the desired
biological activity of the parent compound and does not impart any
undesired toxicological effects (see e.g., Berge, S. M., et al.
(1977) J. Pharm. Sci. 66:1-19). Examples of such salts include acid
addition salts and base addition salts. Acid addition salts include
those derived from nontoxic inorganic acids, such as hydrochloric,
nitric, phosphoric, sulfuric, hydrobromic, hydroiodic, phosphorous
and the like, as well as from nontoxic organic acids such as
aliphatic mono- and dicarboxylic acids, phenyl-substituted alkanoic
acids, hydroxy alkanoic acids, aromatic acids, aliphatic and
aromatic sulfonic acids and the like. Base addition salts include
those derived from alkaline earth metals, such as sodium,
potassium, magnesium, calcium and the like, as well as from
nontoxic organic amines, such as N,N'-dibenzylethylenediamine,
N-methylglucamine, chloroprocaine, choline, diethanolamine,
ethylenediamine, procaine and the like.
[0286] A pharmaceutical composition described herein also may
include a pharmaceutically acceptable anti-oxidant. Examples of
pharmaceutically acceptable antioxidants include: (1) water soluble
antioxidants, such as ascorbic acid, cysteine hydrochloride, sodium
bisulfate, sodium metabisulfite, sodium sulfite and the like; (2)
oil-soluble antioxidants, such as ascorbyl palmitate, butylated
hydroxyanisole (BHA), butylated hydroxytoluene (BHT), lecithin,
propyl gallate, alpha-tocopherol, and the like; and (3) metal
chelating agents, such as citric acid, ethylenediamine tetraacetic
acid (EDTA), sorbitol, tartaric acid, phosphoric acid, and the
like.
[0287] Examples of suitable aqueous and nonaqueous carriers that
may be employed in the pharmaceutical compositions described herein
include water, ethanol, polyols (such as glycerol, propylene
glycol, polyethylene glycol, and the like), and suitable mixtures
thereof, vegetable oils, such as olive oil, and injectable organic
esters, such as ethyl oleate. Proper fluidity can be maintained,
for example, by the use of coating materials, such as lecithin, by
the maintenance of the required particle size in the case of
dispersions, and by the use of surfactants.
[0288] These compositions may also contain adjuvants such as
preservatives, wetting agents, emulsifying agents and dispersing
agents. Prevention of presence of microorganisms may be ensured
both by sterilization procedures, supra, and by the inclusion of
various antibacterial and antifungal agents, for example, paraben,
chlorobutanol, phenol sorbic acid, and the like. It may also be
desirable to include isotonic agents, such as sugars, sodium
chloride, and the like into the compositions. In addition,
prolonged absorption of the injectable pharmaceutical form may be
brought about by the inclusion of agents which delay absorption
such as aluminum monostearate and gelatin.
[0289] Pharmaceutically acceptable carriers include sterile aqueous
solutions or dispersions and sterile powders for the extemporaneous
preparation of sterile injectable solutions or dispersion. The use
of such media and agents for pharmaceutically active substances is
known in the art. Except insofar as any conventional media or agent
is incompatible with the active compound, use thereof in the
pharmaceutical compositions described herein is contemplated.
Supplementary active compounds can also be incorporated into the
compositions.
[0290] Therapeutic compositions typically must be sterile and
stable under the conditions of manufacture and storage. The
composition can be formulated as a solution, microemulsion,
liposome, or other ordered structure suitable to high drug
concentration. The carrier can be a solvent or dispersion medium
containing, for example, water, ethanol, polyol (for example,
glycerol, propylene glycol, and liquid polyethylene glycol, and the
like), and suitable mixtures thereof. The proper fluidity can be
maintained, for example, by the use of a coating such as lecithin,
by the maintenance of the required particle size in the case of
dispersion and by the use of surfactants. In many cases, it will be
preferable to include isotonic agents, for example, sugars,
polyalcohols such as mannitol, sorbitol, or sodium chloride in the
composition. Prolonged absorption of the injectable compositions
can be brought about by including in the composition an agent that
delays absorption, for example, monostearate salts and gelatin.
[0291] Sterile injectable solutions can be prepared by
incorporating the active compound in the required amount in an
appropriate solvent with one or a combination of ingredients
enumerated above, as required, followed by sterilization
microfiltration. Generally, dispersions are prepared by
incorporating the active compound into a sterile vehicle that
contains a basic dispersion medium and the required other
ingredients from those enumerated above. In the case of sterile
powders for the preparation of sterile injectable solutions, the
preferred methods of preparation are vacuum drying and
freeze-drying (lyophilization) that yield a powder of the active
ingredient plus any additional desired ingredient from a previously
sterile-filtered solution thereof.
[0292] The amount of active ingredient which can be combined with a
carrier material to produce a single dosage form will vary
depending upon the subject being treated, and the particular mode
of administration. The amount of active ingredient which can be
combined with a carrier material to produce a single dosage form
will generally be that amount of the composition which produces a
therapeutic effect. Generally, out of one hundred percent, this
amount will range from about 0.01 percent to about ninety-nine
percent of active ingredient, preferably from about 0.1 percent to
about 70 percent, most preferably from about 1 percent to about 30
percent of active ingredient in combination with a pharmaceutically
acceptable carrier.
[0293] Dosage regimens are adjusted to provide the optimum desired
response (e.g., a therapeutic response). For example, a single
bolus may be administered, several divided doses may be
administered over time or the dose may be proportionally reduced or
increased as indicated by the exigencies of the therapeutic
situation. It is especially advantageous to formulate parenteral
compositions in dosage unit form for ease of administration and
uniformity of dosage. Dosage unit form as used herein refers to
physically discrete units suited as unitary dosages for the
subjects to be treated; each unit contains a predetermined quantity
of active compound calculated to produce the desired therapeutic
effect in association with the required pharmaceutical carrier. The
specification for the dosage unit forms described herein are
dictated by and directly dependent on (a) the unique
characteristics of the active compound and the particular
therapeutic effect to be achieved, and (b) the limitations inherent
in the art of compounding such an active compound for the treatment
of sensitivity in individuals.
[0294] For administration of the antibody, the dosage ranges from
about 0.0001 to 100 mg/kg, and more usually 0.01 to 5 mg/kg, of the
host body weight. For example dosages can be 0.3 mg/kg body weight,
1 mg/kg body weight, 3 mg/kg body weight, 5 mg/kg body weight or 10
mg/kg body weight or within the range of 1-10 mg/kg. An exemplary
treatment regime entails administration once per week, once every
two weeks, once every three weeks, once every four weeks, once a
month, once every 3 months or once every three to 6 months.
Preferred dosage regimens for an antibody described herein include
1 mg/kg body weight or 3 mg/kg body weight via intravenous
administration, with the antibody being given using one of the
following dosing schedules: (i) every four weeks for six dosages,
then every three months; (ii) every three weeks; (iii) 3 mg/kg body
weight once followed by 1 mg/kg body weight every three weeks.
[0295] In some methods, two or more monoclonal antibodies with
different binding specificities are administered simultaneously, in
which case the dosage of each antibody administered falls within
the ranges indicated. Antibody is usually administered on multiple
occasions. Intervals between single dosages can be, for example,
weekly, monthly, every three months or yearly. Intervals can also
be irregular as indicated by measuring blood levels of antibody to
the target antigen in the patient. In some methods, dosage is
adjusted to achieve a plasma antibody concentration of about 1-1000
.mu.g/ml and in some methods about 25-300 .mu.g/ml.
[0296] An antibody can be administered as a sustained release
formulation, in which case less frequent administration is
required. Dosage and frequency vary depending on the half-life of
the antibody in the patient. In general, human antibodies show the
longest half-life, followed by humanized antibodies, chimeric
antibodies, and nonhuman antibodies. The dosage and frequency of
administration can vary depending on whether the treatment is
prophylactic or therapeutic. In prophylactic applications, a
relatively low dosage is administered at relatively infrequent
intervals over a long period of time. Some patients continue to
receive treatment for the rest of their lives. In therapeutic
applications, a relatively high dosage at relatively short
intervals is sometimes required until progression of the disease is
reduced or terminated, and preferably until the patient shows
partial or complete amelioration of symptoms of disease.
Thereafter, the patient can be administered a prophylactic
regime.
[0297] Actual dosage levels of the active ingredients in the
pharmaceutical compositions described herein may be varied so as to
obtain an amount of the active ingredient which is effective to
achieve the desired therapeutic response for a particular patient,
composition, and mode of administration, without being toxic to the
patient. The selected dosage level will depend upon a variety of
pharmacokinetic factors including the activity of the particular
compositions described herein employed, or the ester, salt or amide
thereof, the route of administration, the time of administration,
the rate of excretion of the particular compound being employed,
the duration of the treatment, other drugs, compounds and/or
materials used in combination with the particular compositions
employed, the age, sex, weight, condition, general health and prior
medical history of the patient being treated, and like factors well
known in the medical arts.
[0298] A "therapeutically effective dosage" of an antibody
described herein preferably results in a decrease in severity of
disease symptoms, an increase in frequency and duration of disease
symptom-free periods, or a prevention of impairment or disability
due to the disease affliction. In the context of cancer, a
therapeutically effective dose preferably prevents further
deterioration of physical symptoms associated with cancer. Symptoms
of cancer are well-known in the art and include, for example,
unusual mole features, a change in the appearance of a mole,
including asymmetry, border, color and/or diameter, a newly
pigmented skin area, an abnormal mole, darkened area under nail,
breast lumps, nipple changes, breast cysts, breast pain, death,
weight loss, weakness, excessive fatigue, difficulty eating, loss
of appetite, chronic cough, worsening breathlessness, coughing up
blood, blood in the urine, blood in stool, nausea, vomiting, liver
metastases, lung metastases, bone metastases, abdominal fullness,
bloating, fluid in peritoneal cavity, vaginal bleeding,
constipation, abdominal distension, perforation of colon, acute
peritonitis (infection, fever, pain), pain, vomiting blood, heavy
sweating, fever, high blood pressure, anemia, diarrhea, jaundice,
dizziness, chills, muscle spasms, colon metastases, lung
metastases, bladder metastases, liver metastases, bone metastases,
kidney metastases, and pancreatic metastases, difficulty
swallowing, and the like.
[0299] A therapeutically effective dose may prevent or delay onset
of cancer, such as may be desired when early or preliminary signs
of the disease are present. Laboratory tests utilized in the
diagnosis of cancer include chemistries, hematology, serology and
radiology. Accordingly, any clinical or biochemical assay that
monitors any of the foregoing may be used to determine whether a
particular treatment is a therapeutically effective dose for
treating cancer. One of ordinary skill in the art would be able to
determine such amounts based on such factors as the subject's size,
the severity of the subject's symptoms, and the particular
composition or route of administration selected.
[0300] A composition described herein can be administered via one
or more routes of administration using one or more of a variety of
methods known in the art. As will be appreciated by the skilled
artisan, the route and/or mode of administration will vary
depending upon the desired results. Preferred routes of
administration for antibodies described herein include intravenous,
intramuscular, intradermal, intraperitoneal, subcutaneous, spinal
or other parenteral routes of administration, for example by
injection or infusion. The phrase "parenteral administration" as
used herein means modes of administration other than enteral and
topical administration, usually by injection, and includes, without
limitation, intravenous, intramuscular, intraarterial, intrathecal,
intracapsular, intraorbital, intracardiac, intradermal,
intraperitoneal, transtracheal, subcutaneous, subcuticular,
intraarticular, subcapsular, subarachnoid, intraspinal, epidural
and intrasternal injection and infusion.
[0301] Alternatively, an antibody described herein can be
administered via a non-parenteral route, such as a topical,
epidermal or mucosal route of administration, for example,
intranasally, orally, vaginally, rectally, sublingually or
topically.
[0302] The active compounds can be prepared with carriers that will
protect the compound against rapid release, such as a controlled
release formulation, including implants, transdermal patches, and
microencapsulated delivery systems. Biodegradable, biocompatible
polymers can be used, such as ethylene vinyl acetate,
polyanhydrides, polyglycolic acid, collagen, polyorthoesters, and
polylactic acid. Many methods for the preparation of such
formulations are patented or generally known to those skilled in
the art. See, e.g., Sustained and Controlled Release Drug Delivery
Systems, J. R. Robinson, ed., Marcel Dekker, Inc., New York,
1978.
[0303] Therapeutic compositions can be administered with medical
devices known in the art. For example, in a preferred embodiment, a
therapeutic composition described herein can be administered with a
needleless hypodermic injection device, such as the devices
disclosed in U.S. Pat. Nos. 5,399,163; 5,383,851; 5,312,335;
5,064,413; 4,941,880; 4,790,824; or 4,596,556. Examples of
well-known implants and modules for use with antibodies described
herein include: U.S. Pat. No. 4,487,603, which discloses an
implantable micro-infusion pump for dispensing medication at a
controlled rate; U.S. Pat. No. 4,486,194, which discloses a
therapeutic device for administering medicants through the skin;
U.S. Pat. No. 4,447,233, which discloses a medication infusion pump
for delivering medication at a precise infusion rate; U.S. Pat. No.
4,447,224, which discloses a variable flow implantable infusion
apparatus for continuous drug delivery; U.S. Pat. No. 4,439,196,
which discloses an osmotic drug delivery system having
multi-chamber compartments; and U.S. Pat. No. 4,475,196, which
discloses an osmotic drug delivery system. These patents are
incorporated herein by reference. Many other such implants,
delivery systems, and modules are known to those skilled in the
art.
[0304] In certain embodiments, the antibodies described herein can
be formulated to ensure proper distribution in vivo. For example,
the blood-brain barrier (BBB) excludes many highly hydrophilic
compounds. To ensure that the therapeutic compounds described
herein cross the BBB (if desired), they can be formulated, for
example, in liposomes. For methods of manufacturing liposomes, see,
e.g., U.S. Pat. Nos. 4,522,811; 5,374,548; and 5,399,331. The
liposomes may comprise one or more moieties which are selectively
transported into specific cells or organs, thus enhance targeted
drug delivery (see, e.g., V. V. Ranade (1989) J. Clin. Pharmacol.
29:685). Exemplary targeting moieties include folate or biotin
(see, e.g., U.S. Pat. No. 5,416,016 to Low et al.); mannosides
(Umezawa et al., (1988) Biochem. Biophys. Res. Commun. 153:1038);
antibodies (P. G. Bloeman et al. (1995) FEBS Lett. 357:140; M.
Owais et al. (1995) Antimicrob. Agents Chemother. 39:180);
surfactant protein A receptor (Briscoe et al. (1995) Am. J.
Physiol. 1233:134); p120 (Schreier et al. (1994) J. Biol. Chem.
269:9090); see also K. Keinanen; M. L. Laukkanen (1994) FEBS Lett.
346:123; J. J. Killion; I. J. Fidler (1994) Immunomethods
4:273.
VII. Uses and Methods
[0305] The antibodies, antibody compositions and methods described
herein have numerous in vitro and in vivo utilities involving, for
example, the treatment of various disorders, e.g., cancers. For
example, antibodies described herein can be administered to cells
in culture, in vitro or ex vivo, or to human subjects, e.g., in
vivo. Accordingly, provided herein are methods of treatment of a
subject comprising administering to the subject an antibody
comprising a modified heavy chain constant region, such that
treatment occurs. Also provided herein are methods of modifying an
immune response in a subject comprising administering to the
subject an antibody such that the immune response in the subject is
modified. Preferably, the response is enhanced, stimulated or
up-regulated. However, in other embodiments, an immune response is
inhibited.
[0306] Preferred subjects include human patients in whom
enhancement of an immune response would be desirable. The methods
are particularly suitable for treating human patients having a
disorder that can be treated by augmenting an immune response
(e.g., the T-cell mediated immune response). In a particular
embodiment, the methods are particularly suitable for treatment of
cancer in vivo. In one embodiment, the subject is a tumor-bearing
subject and an immune response against the tumor is stimulated. A
tumor may be a solid tumor or a liquid tumor, e.g., a hematological
malignancy. In certain embodiments, a tumor is an immunogenic
tumor. In certain embodiments, a tumor is non-immunogenic. In
certain embodiments, a tumor is PD-L1 positive. In certain
embodiments a tumor is PD-L1 negative. A subject may also be a
virus-bearing subject and an immune response against the virus is
stimulated.
[0307] Further provided are methods for inhibiting growth of tumor
cells in a subject comprising administering to the subject an
antibody described herein such that growth of the tumor is
inhibited in the subject. Also provided are methods of treating
viral infection in a subject comprising administering to the
subject an antibody described herein such that the viral infection
is treated in the subject.
[0308] Also encompassed herein are methods for depleting Treg cells
from the tumor microenvironment of a subject having a tumor, e.g.,
cancerous tumor, comprising administering to the subject a
therapeutically effective amount of an antibody described herein
that comprises an Fc that stimulates depletion of T.sub.reg cells
in the tumor microenvironment. An Fc may, e.g., be an Fc with
effector function or enhanced effector function, such as binding or
having enhanced binding to one or more activating Fc receptors.
[0309] In certain embodiments, an antibody comprising a modified
heavy chain constant region binds to a stimulatory molecule and
inhibits its activity, i.e., is an antagonist of a stimulatory
molecule, or the antibody binds to an inhibitory molecule and
stimulates its activity, i.e., is an agonist of an inhibitory
molecule. Such antibodies may be used for treating disease in which
the immune system or an immune response should be downregulated,
e.g., autoimmune diseases or to prevent transplant rejections.
Cancer
[0310] Provided herein are methods for treating a subject having
cancer, comprising administering to the subject antibody described
herein, such that the subject is treated, e.g., such that growth of
cancerous tumors is inhibited or reduced and/or that the tumors
regress. For example, activation of GITR by anti-GITR antibodies
can enhance the immune response to cancerous cells in the patient.
The antibody can be used alone to inhibit the growth of cancerous
tumors. Alternatively, the antibody can be used in conjunction with
another agent, e.g., other immunogenic agents, standard cancer
treatments, or other antibodies, as described below.
[0311] Cancers whose growth may be inhibited using the antibodies
described herein include cancers typically responsive to
immunotherapy. Non-limiting examples of cancers for treatment
include squamous cell carcinoma, small-cell lung cancer, non-small
cell lung cancer, squamous non-small cell lung cancer (NSCLC), non
NSCLC, glioma, gastrointestinal cancer, renal cancer (e.g. clear
cell carcinoma), ovarian cancer, liver cancer, colorectal cancer,
endometrial cancer, kidney cancer (e.g., renal cell carcinoma
(RCC)), prostate cancer (e.g. hormone refractory prostate
adenocarcinoma), thyroid cancer, neuroblastoma, pancreatic cancer,
glioblastoma (glioblastoma multiforme), cervical cancer, stomach
cancer, bladder cancer, hepatoma, breast cancer, colon carcinoma,
and head and neck cancer (or carcinoma), gastric cancer, germ cell
tumor, pediatric sarcoma, sinonasal natural killer, melanoma (e.g.,
metastatic malignant melanoma, such as cutaneous or intraocular
malignant melanoma), bone cancer, skin cancer, uterine cancer,
cancer of the anal region, testicular cancer, carcinoma of the
fallopian tubes, carcinoma of the endometrium, carcinoma of the
cervix, carcinoma of the vagina, carcinoma of the vulva, cancer of
the esophagus, cancer of the small intestine, cancer of the
endocrine system, cancer of the parathyroid gland, cancer of the
adrenal gland, sarcoma of soft tissue, cancer of the urethra,
cancer of the penis, solid tumors of childhood, cancer of the
ureter, carcinoma of the renal pelvis, neoplasm of the central
nervous system (CNS), primary CNS lymphoma, tumor angiogenesis,
spinal axis tumor, brain stem glioma, pituitary adenoma, Kaposi's
sarcoma, epidermoid cancer, squamous cell cancer, T-cell lymphoma,
environmentally-induced cancers including those induced by
asbestos, virus-related cancers (e.g., human papilloma virus
(HPV)-related tumor), and hematologic malignancies derived from
either of the two major blood cell lineages, i.e., the myeloid cell
line (which produces granulocytes, erythrocytes, thrombocytes,
macrophages and mast cells) or lymphoid cell line (which produces
B, T, NK and plasma cells), such as all types of luekemias,
lymphomas, and myelomas, e.g., acute, chronic, lymphocytic and/or
myelogenous leukemias, such as acute leukemia (ALL), acute
myelogenous leukemia (AML), chronic lymphocytic leukemia (CLL), and
chronic myelogenous leukemia (CML), undifferentiated AML (M0),
myeloblastic leukemia (M1), myeloblastic leukemia (M2; with cell
maturation), promyelocytic leukemia (M3 or M3 variant [M3V]),
myelomonocytic leukemia (M4 or M4 variant with eosinophilia [M4E]),
monocytic leukemia (M5), erythroleukemia (M6), megakaryoblastic
leukemia (M7), isolated granulocytic sarcoma, and chloroma;
lymphomas, such as Hodgkin's lymphoma (HL), non-Hodgkin's lymphoma
(NHL), B-cell lymphomas, T-cell lymphomas, lymphoplasmacytoid
lymphoma, monocytoid B-cell lymphoma, mucosa-associated lymphoid
tissue (MALT) lymphoma, anaplastic (e.g., Ki 1+) large-cell
lymphoma, adult T-cell lymphoma/leukemia, mantle cell lymphoma,
angio immunoblastic T-cell lymphoma, angiocentric lymphoma,
intestinal T-cell lymphoma, primary mediastinal B-cell lymphoma,
precursor T-lymphoblastic lymphoma, T-lymphoblastic; and
lymphoma/leukaemia (T-Lbly/T-ALL), peripheral T-cell lymphoma,
lymphoblastic lymphoma, post-transplantation lymphoproliferative
disorder, true histiocytic lymphoma, primary central nervous system
lymphoma, primary effusion lymphoma, lymphoblastic lymphoma (LBL),
hematopoietic tumors of lymphoid lineage, acute lymphoblastic
leukemia, diffuse large B-cell lymphoma, Burkitt's lymphoma,
follicular lymphoma, diffuse histiocytic lymphoma (DHL),
immunoblastic large cell lymphoma, precursor B-lymphoblastic
lymphoma, cutaneous T-cell lymphoma (CTLC) (also called mycosis
fungoides or Sezary syndrome), and lymphoplasmacytoid lymphoma
(LPL) with Waldenstrom's macroglobulinemia; myelomas, such as IgG
myeloma, light chain myeloma, nonsecretory myeloma, smoldering
myeloma (also called indolent myeloma), solitary plasmocytoma, and
multiple myelomas, chronic lymphocytic leukemia (CLL), hairy cell
lymphoma; hematopoietic tumors of myeloid lineage, tumors of
mesenchymal origin, including fibrosarcoma and rhabdomyoscarcoma;
seminoma, teratocarcinoma, tumors of the central and peripheral
nervous, including astrocytoma, schwannomas; tumors of mesenchymal
origin, including fibrosarcoma, rhabdomyoscaroma, and osteosarcoma;
and other tumors, including melanoma, xeroderma pigmentosum,
keratoacanthoma, seminoma, thyroid follicular cancer and
teratocarcinoma, hematopoietic tumors of lymphoid lineage, for
example T-cell and B-cell tumors, including but not limited to
T-cell disorders such as T-prolymphocytic leukemia (T-PLL),
including of the small cell and cerebriform cell type; large
granular lymphocyte leukemia (LGL) preferably of the T-cell type;
a/d T-NHL hepatosplenic lymphoma; peripheral/post-thymic T cell
lymphoma (pleomorphic and immunoblastic subtypes); angiocentric
(nasal) T-cell lymphoma; cancer of the head or neck, renal cancer,
rectal cancer, cancer of the thyroid gland; acute myeloid lymphoma,
as well as any combinations of said cancers. The methods described
herein may also be used for treatment of metastatic cancers,
refractory cancers (e.g., cancers refractory to previous
immunotherapy, e.g., with a blocking CTLA-4 or PD-1 antibody), and
recurrent cancers.
Combination Therapies
[0312] In addition to the therapies provided above, the antibodies
described herein can also be used in combination with another
therapy. For example, for cancer treatment, an antibody described
herein may be administered to a subject who is also receiving
another cancer treatment, such as chemotherapy, radiation, surgery
or gene therapy.
[0313] Methods of treatment may include coadministration of an
antibody described herein (e.g., an antagonist antibody, agonist
antibody, and ADC having a modified heavy chain constant region)
with another molecule, e.g., antibody (e.g., an antagonist
antibody, agonist antibody, and ADC). An antibody described herein
that stimulates the immune system may be administered with another
molecule that stimulates the immune system, e.g., a molecule that
is an agonist of a co-stimulatory molecule or an inhibitor of an
inhibitory molecule.
[0314] An antibody as described herein alone or with one or more
additional immune stimulating antibodies (e.g., CTLA-4 and/or PD-1
and/or PD-L1 and/or LAG-3 blockade) can be combined with standard
cancer treatments. For example, an antibody described herein alone
or with one or more additional antibodies can be effectively
combined with chemotherapeutic regimes. In these instances, it may
be possible to reduce the dose of other chemotherapeutic reagent
administered with the combination of the instant disclosure (Mokyr
et al. (1998) Cancer Research 58: 5301-5304). An example of such a
combination is a combination of an antibody described herein, with
or without and an additional antibody, further in combination with
decarbazine or IL-2 for the treatment of melanoma.
[0315] An antibody described herein may be combined with an
anti-neoplastic antibody, such as Rituxan.RTM. (rituximab),
Herceptin.RTM. (trastuzumab), Bexxar.RTM. (tositumomab),
Zevalin.RTM. (ibritumomab), Campath.RTM. (alemtuzumab),
Lymphocide.RTM. (eprtuzumab), Avastin.RTM. (bevacizumab), and
Tarceva.RTM. (erlotinib), and the like. Antibodies described herein
may also be combined with one or more of the following
chemotherapeutic agents: camptothecin (CPT-11), 5-fluorouracil
(5-FU), cisplatin, doxorubicin, irinotecan, paclitaxel,
gemcitabine, cisplatin, paclitaxel, carboplatin-paclitaxel (Taxol),
doxorubicin, 5-fu, or camptothecin+apo21/TRAIL (a 6X combo)); a
proteasome inhibitor (e.g., bortezomib or MG132); a Bc1-2 inhibitor
(e.g., BH3I-2' (bcl-xl inhibitor), indoleamine dioxygenase-1 (IDO1)
inhibitor (e.g., INCB24360), AT-101 (R-(-)-gossypol derivative),
ABT-263 (small molecule), GX-15-070 (obatoclax), or MCL-1 (myeloid
leukemia cell differentiation protein-1) antagonists), iAP
(inhibitor of apoptosis protein) antagonists (e.g., smac7, smac4,
small molecule smac mimetic, synthetic smac peptides (see Fulda et
al., Nat Med 2002; 8:808-15), ISIS23722 (LY2181308), or AEG-35156
(GEM-640)), HDAC (histone deacetylase) inhibitors, anti-CD20
antibodies (e.g., rituximab), angiogenesis inhibitors (e.g.,
bevacizumab), anti-angiogenic agents targeting VEGF and VEGFR
(e.g., Avastin), synthetic triterpenoids (see Hyer et al., Cancer
Research 2005; 65:4799-808), c-FLIP (cellular FLICE-inhibitory
protein) modulators (e.g., natural and synthetic ligands of
PPAR.gamma. (peroxisome proliferator-activated receptor .gamma.),
5809354 or 5569100), kinase inhibitors (e.g., Sorafenib),
Trastuzumab, Cetuximab, Temsirolimus, mTOR inhibitors such as
rapamycin and temsirolimus, Bortezomib, JAK2 inhibitors, HSP90
inhibitors, PI3K-AKT inhibitors, Lenalildomide, GSK3.beta.
inhibitors, IAP inhibitors and/or genotoxic drugs.
[0316] The antibodies and combination antibody therapies described
herein can further be used in combination with one or more
anti-proliferative cytotoxic agents. Classes of compounds that may
be used as anti-proliferative cytotoxic agents include, but are not
limited to, the following:
[0317] Alkylating agents (including, without limitation, nitrogen
mustards, ethylenimine derivatives, alkyl sulfonates, nitrosoureas
and triazenes): Uracil mustard, Chlormethine, Cyclophosphamide
(CYTOXAN.TM.) fosfamide, Melphalan, Chlorambucil, Pipobroman,
Triethylenemelamine, Triethylenethiophosphoramine, Busulfan,
Carmustine, Lomustine, Streptozocin, Dacarbazine, and
Temozolomide.
[0318] Antimetabolites (including, without limitation, folic acid
antagonists, pyrimidine analogs, purine analogs and adenosine
deaminase inhibitors): Methotrexate, 5-Fluorouracil, Floxuridine,
Cytarabine, 6-Mercaptopurine, 6-Thioguanine, Fludarabine phosphate,
Pentostatine, and Gemcitabine.
[0319] Suitable anti-proliferative agents for combining with
antibodies described herein, without limitation, taxanes,
paclitaxel (paclitaxel is commercially available as TAXOL.TM.),
docetaxel, discodermolide (DDM), dictyostatin (DCT), Peloruside A,
epothilones, epothilone A, epothilone B, epothilone C, epothilone
D, epothilone E, epothilone F, furanoepothilone D, desoxyepothilone
B1, [17]-dehydrodesoxyepothilone B, [18]dehydrodesoxyepothilones B,
C12,13-cyclopropyl-epothilone A, C6-C8 bridged epothilone A,
trans-9,10-dehydroepothilone D, cis-9,10-dehydroepothilone D,
16-desmethylepothilone B, epothilone B10, discoderomolide,
patupilone (EPO-906), KOS-862, KOS-1584, ZK-EPO, ABJ-789, XAA296A
(Discodermolide), TZT-1027 (soblidotin), ILX-651 (tasidotin
hydrochloride), Halichondrin B, Eribulin mesylate (E-7389),
Hemiasterlin (HTI-286), E-7974, Cyrptophycins, LY-355703,
Maytansinoid immunoconjugates (DM-1), MKC-1, ABT-751, T1-38067,
T-900607, SB-715992 (ispinesib), SB-743921, MK-0731, STA-5312,
eleutherobin,
17beta-acetoxy-2-ethoxy-6-oxo-B-homo-estra-1,3,5(10)-trien-3-ol,
cyclostreptin, isolaulimalide, laulimalide,
4-epi-7-dehydroxy-14,16-didemethyl-(+)-discodermolides, and
cryptothilone 1, in addition to other microtubuline stabilizing
agents known in the art.
[0320] Combination treatments can be administered simultaneously or
sequentially. In certain examples, combinations are fixed dose
combinations.
[0321] In cases where it is desirable to render aberrantly
proliferative cells quiescent in conjunction with or prior to
treatment with the antibodies described herein, hormones and
steroids (including synthetic analogs), such as
17a-Ethinylestradiol, Diethylstilbestrol, Testosterone, Prednisone,
Fluoxymesterone, Dromostanolone propionate, Testolactone,
Megestrolacetate, Methylprednisolone, Methyl-testosterone,
Prednisolone, Triamcinolone, Chlorotrianisene, Hydroxyprogesterone,
Aminoglutethimide, Estramustine, Medroxyprogesteroneacetate,
Leuprolide, Flutamide, Toremifene, ZOLADEX.TM., can also be
administered to the patient. When employing the methods or
compositions described herein, other agents used in the modulation
of tumor growth or metastasis in a clinical setting, such as
antimimetics, can also be administered as desired.
[0322] Methods for the safe and effective administration of
chemotherapeutic agents are known to those skilled in the art. In
addition, their administration is described in the standard
literature.
[0323] For example, the administration of many of the
chemotherapeutic agents is described in the Physicians' Desk
Reference (PDR), e.g., 1996 edition (Medical Economics Company,
Montvale, N.J. 07645-1742, USA); the disclosure of which is
incorporated herein by reference thereto.
[0324] The chemotherapeutic agent(s) and/or radiation therapy can
be administered according to therapeutic protocols well known in
the art. It will be apparent to those skilled in the art that the
administration of the chemotherapeutic agent(s) and/or radiation
therapy can be varied depending on the disease being treated and
the known effects of the chemotherapeutic agent(s) and/or radiation
therapy on that disease. Also, in accordance with the knowledge of
the skilled clinician, the therapeutic protocols (e.g., dosage
amounts and times of administration) can be varied in view of the
observed effects of the administered therapeutic agents on the
patient, and in view of the observed responses of the disease to
the administered therapeutic agents.
[0325] The present disclosure is further illustrated by the
following examples, which should not be construed as further
limiting. The contents of all figures and all references, Genbank
sequences, patents and published patent applications cited
throughout this application are expressly incorporated herein by
reference. In particular, the disclosures of PCT publications WO
09/045957, WO 09/073533, WO 09/073546, WO 09/054863 and
PCT/US2013/072918, and U.S. Patent Publication No. 2011/0150892 are
expressly incorporated herein by reference.
EXAMPLES
Example 1: Enhanced Internalization of Anti-CD73 Antibodies with an
IgG2 Hinge Relative to the Same Antibodies with a Non-IgG2
Hinge
[0326] It had been observed that hybridoma derived anti-CD73
antibody 11F11, which has an IgG2 constant region, is more potent
in cellular CD73 inhibition assays than the 11F11 antibody as an
IgG1 or IgG1.1 (effectorless IgG1), and more potent than other
anti-CD73 antibodies having IgG1 constant regions. Based at least
on this observation, it was hypothesized that increased inhibitory
activity of anti-CD73 antibodies having IgG2 hinges relative to
those having non-IgG2 hinges, such as IgG1 hinges, was due to
increased internalization of the antibodies. To test this
hypothesis, anti-CD73 antibodies having IgG1 or IgG2 constant
regions or portions thereof were tested in internalization
assays.
[0327] The antibodies that were used are listed in Table 7 which
provides the identities of each of the domains of the constant
regions (all human) of each antibody, including specific mutations
if present.
TABLE-US-00011 TABLE 7 Name of HC SEQ LC SEQ antibody VH CH1 Hinge
CH2 CH3 ID NO.sup.1 ID NO.sup.2 11F11 11F11 IgG2 IgG2 IgG2 IgG2 44
72 4C3 4C3 IgG1 IgG1 IgG1 IgG1 45 73 6D11 6D11 IgG1 IgG1 IgG1 IgG1
46 74 CD73.10- CD73.10 IgG2 IgG2 (C219S) IgG2 IgG2 47 72 IgG2-C219S
CD73.10- CD73.10 IgG2 IgG2 (C219S) IgG1.1 IgG2 48 72 IgG2-C219S-
(A330S/P331S) IgG1.1 CD73.10- CD73.10 IgG1.1 IgG1.1 IgG1.1 IgGl.1
49 72 IgG1.1 (L234A/L235E/ (A330S/P331S) G237A) CD73.4-IgG2-
CD73.10 IgG2 IgG2 (C219S) IgG2 IgG2 50 72 C219S CD73.3- CD73.3
IgG1.1 IgG1.1 IgG1.1 IgGl.1 51 73 IgG1.1 (L234A/L235E/
(A330S/P331S) G237A) .sup.1SEQ ID NO of full length heavy chain
.sup.2SEQ ID NO of full length light chain
[0328] The antibodies were made by expressing the heavy and light
chains in HEK293-6E cells, and culture media was harvested 5 days
after transfection.
[0329] Binding of the constructs to Fc.gamma.Rs was measured. hCD64
and hCD32a-H131 binding data for IgG1.1 and IgG2 molecules were
consistent with expected values for the different Fcs. IgG1.1f is
the most inert Fc. IgG2 and IgG2-C219S showed typical FcR binding
for IgG2. As expected, data for IgG2-C219S-G1.1f suggests
significantly weaker binding than wild type IgG1 or IgG2, but
increased binding compared to IgG1.1f.
[0330] The affinity of the antibodies for human CD73 was measured
to determine whether the change of the constant region affects
them. The affinities were determined by Surface Plasmon Resonance
(SPR) as follows. CD73 binding kinetics and affinity were studied
by surface Plasmon resonance (SPR) using a Biacore T100 instrument
(GE Healthcare) at 25.degree. C. This experiment tested the binding
of the N-terminal domain of hCD73 (consisting of residues 26-336 of
human CD73; termed N-hCD73) to antibodies that were captured on
immobilized protein A surfaces. For these experiments, protein A
(Pierce) was immobilized to a density of 3000-4000 RU on flow cells
1-4 of a CM5 sensor chip (GE Healthcare) using standard
ethyl(dimethylaminopropyl) carbodiimide (EDC)/N-hydroxysuccinimide
(NHS) chemistry, with ethanolamine blocking, in a running buffer of
0.01 M HEPES pH 7.4, 0.15 M NaCl, 3 mM EDTA, 0.005% v/v tween 20.
Kinetic experiments were performed by first capturing antibodies
(5-10ug/ml) on the protein A surfaces using a 30 s contact time at
10ul/min, with binding of 600, 200, 66.7, 22.2, 7.4, and 2.5 nM
N-hCD73-his, using a 180 s association time and 360 s dissociation
time at a flow rate of 30 ul/min. The running buffer for the
kinetic experiments was 10 mM sodium phosphate, 130 mM sodium
chloride, 0.05% tween 20, pH 7.1. The surfaces were regenerated
after each cycle using two 30 s pulses of 10 mM glycine pH 1.5 at a
flow rate of 30 .mu.l/min. Sensogram data was double-referenced and
then fitted to a 1:1 Langmuir model using Biacore T100 evaluation
software v2.0.4, to determine the association rate constant (ka),
the dissociation rate constant (kd), and the equilibrium
dissociation constant (KD).
[0331] The results are shown in Table 8. The table compiles data
from different experiments. For antibodies for which two sets of
numbers are shown, each set corresponds to data obtained in a
separate experiment.
TABLE-US-00012 TABLE 8 mAb Fc ka (1/Ms) kd (1/s) KD (nM) 11F11 IgG2
2.6E+05 4.2E-04 1.6 2.9E+05 1.6E-04 0.56 4C3 IgG1 2.2E+04 2.4E-03
110 2.4E+04 2.2E-03 92 6E11 IgG1 5.7E+04 1.4E-03 25 CD73.10 IgG1.1
2.7E+05 1.3E-03 4.7 CD73.10 IgG2-C219S 2.2E+05 1.4E-03 6.2 2.2E+05
1.8E-03 8.3 CD73.10 IgG2-C219S-IgG1.1 2.4E+05 1.4E-03 5.7 2.3E+05
1.60E-03 6.8 CD73.4 IgG2-C219S 2.9E+05 1.6E-04 0.55 2.8E+05 3.3E-04
1.2 2.9E+05 3.7E-04 1.3 CD73.3 IgG1.1 1.6E+04 3.6E-03 220
[0332] The results indicate that the presence of the different
constant regions in an antibody, e.g., CD73.10, did not change the
affinity of the antibody to human CD73.
The internalization of anti-CD73 antibodies was measured in two
different assays.
[0333] A. High-Content Internalization Assay (2 Hour Fixed Time
Assay)
[0334] The anti-CD73 antibodies used to test anti-CD73 antibody
dependent CD73 internalization in Calu6 cells by assessing cellular
expression after 2 hours of antibody incubation. Cells (2,000
cells/well) in 20 .mu.l of complete medium (Gibco RPMI Media 1640
with 10% heat inactivated fetal bovine serum) were plated in 384 BD
Falcon plate and grown overnight at 37.degree. C. 5% CO.sub.2 and
95% humidity. Anti-CD73 antibodies were serially diluted with PBS
buffer containing 0.2% BSA, and added 5 .mu.l/well into the cell
plate. The cells were incubated with antibodies for 2 hours at
37.degree. C. 5% CO.sub.2 and 95% humidity, followed by washing
once with PBS buffer. Formaldehyde (final 4% in PBS) was then added
into the cell plate at 20 .mu.l/well, and the plate was incubated
at room temperature for 10 minutes. Afterwards, all liquid was
aspirated and cells were washed once with 30ul PBS. Detection
antibody (2.5 .mu.g/well of anti-CD73 Ab CD73.10.IgG2C219S) was
added at 15 .mu.g/well into the fixed cell plate. The cells were
incubated at 4.degree. C. overnight. On the next day, the plate was
washed twice with PBS buffer, followed by adding secondary antibody
containing Alexa-488 goat anti human and DAPI, stained for 1 hour
at room temperature. After 3 washes in PBS buffer, the plate was
imaged on Arrayscan Vti (Cellomics, Pittsburgh, Pa.). IC.sub.50 and
Ymax were measured. Ymax was determined by comparing to 100 nM dose
of 11F11 as internal maximum. All calculations were determined as a
percentage of internalization compared to this control, which was
set to 100%.
[0335] The results are provided in Table 9.
TABLE-US-00013 TABLE 9 mAb Constant region Epitope bin EC50 (nM)
Ymax 11F11 IgG2 1 0.58 98 4D4 IgG2 1 0.38 104 10D2 IgG1 1 ND 29
24H2 IgG1 1 8.2 51 7A11 IgG1 1 2.59 50 CD73.4 IgG2-C219S-IgG1.1 1
1.2 97 CD73.10 IgG1.1 1 6.18 64 CD73.10 IgG2-C219S 1 0.67 99
CD73.10 IgG2-C219S-IgG1.1 1 0.87 99 ND = Not Detected NA = Not
Applicable
[0336] The results show that anti-CD73 antibodies having an IgG2
hinge have a lower EC50 and higher Ymax.
[0337] Kinetic internalization studies were performed to assess the
rate of internalization. Several cells lines were tested: H2228
cells, HCC15 cells, Calu6 cells, and NCI-H2030. Cells (2,000
cells/well) in 20 .mu.l of complete medium (Gibco RPMI Media 1640
with 10% heat inactivated fetal bovine serum) were plated in 384 BD
Falcon plate and grown overnight at 37.degree. C. 5% CO.sub.2 and
95% humidity. CD73 antibodies were diluted with PBS buffer
containing 0.2% BSA to 10 .mu.g/ml and added 5 .mu.l/well into the
cell plate. The cells were incubated with antibodies for 0-2 hour
time course at 37.degree. C., followed by washing once with PBS
buffer. The cells were subsequently fixed with formaldehyde (final
4% in PBS) at room temperature for 10 minutes, and then washed once
with 30ul PBS. Detection antibody (2.5 .mu.g/well anti-CD73 Abs
CD73.10.IgG2C219S) were diluted with PBS buffer containing 0.2%
BSA, and added 15 .mu.l/well into the fixed cell plate. The plate
was incubated at 4.degree. C. for overnight. On the next day, after
3 washes in PBS buffer, Secondary antibody Alexa488-goat anti human
with DAPI were added. The cells were stained for 60 minutes at room
temperature, after 3 washes, images were acquired using Arrayscan
Vti (Cellomics, Pittsburgh, Pa.). The results are provided in FIGS.
1A-J and Tables 10 and 11. The values in Table 10 derive from the
data shown in FIGS. 1A-J.
TABLE-US-00014 TABLE 10 11F11(IgG2) 6E11(IgG1) CD73.10.IgG1.1f Cell
line T.sub.1/2 (min) T.sub.1/2 (min) T.sub.1/2 (min) Calu6 3.9 60.9
14.4 HCC44 3.3 27.9 23.5 H2030 3.3 40.3 18.3 H647 45.7 N/A N/A
H2228 10.9 36.5 35.7 HCC15 2.2 84.4 37.9 SKLU1 6.8 18.0 17.2 SKMES1
2.2 62.8 32.3 SW900 10.3 94.9 43.4
TABLE-US-00015 TABLE 11 T.sub.1/2 and % internalization of CD73
antibodies in 4 human cell lines H228 cells HCC15 cells Calu6 cells
H2030 cells % % % % T.sub.1/2 interna- T.sub.1/2 interna- T.sub.1/2
interna- T.sub.1/2 interna- min lization min lization min lization
min lization CD73.11-IgG2CS -- -- -- -- 4.1 89 4.6 85
CD73.10-IgG2CS 9.7 93 2.6 91 3.0 91 3.3 85 CD73.10-IgG2CS- IgG1.1f
9.4 92 3.0 91 3.1 91 4.3 87 CD73.4-IgG2CS 13.8 94 3.1 94 6.5 88 3.7
89 CD73.10-IgG1.1f 35.7 33 37.9 71 14.4 63 18.3 67 CD73.3-IgG1.1f
16.5 -47 >240 38 111.4 79 >120 27 11F11 10.9 96 2.2 94 3.9 87
3.3 90 4C3 7.6 -48 141.5 28 0.6 -6 >120 -34 6E11 36.5 13 84.4 64
107.4 68 40.32 51
[0338] The results indicate that 11F11 (an IgG2 antibody)
internalized within minutes, reaching a plateau in 30 minutes,
whereas 6E11 (an IgG1 antibody) internalized more slowly, reaching
a plateau at about 1 hr (FIGS. 1A-J). Similarly, 11F11 with an IgG1
constant region internalized more slowly than 11F11 with an IgG2
constant region. This trend was observed in several cell lines
(Tables 10 and 11 and FIGS. 1A-J).
[0339] B. Internalization Measured by Flow Cytometry
[0340] Anti-CD73 antibody mediated internalization of CD73 was also
tested by flow cytometry. Indicated cells were incubated with 10
.mu.g/mL of the indicated antibody for 30 minutes on ice, washed
several times, and transferred to 37.degree. C. for the indicated
time. Cells were harvested at the same time after the indicated
incubation time. Cells were stained with primary antibody again
(same antibody used for initial incubation) followed by anti-human
secondary antibody. Cells were then assayed for expression of CD73
by flow cytometry.
[0341] The results, which are shown in FIG. 1E and Table 11, are
consistent with those obtained in the internalization assays
described above, and indicate that, all antibodies with IgG2 hinge
and CH1 induced rapid and complete internalization. The CD73 levels
remained low after 22 hours post wash-out, indicating that
internalization is durable.
[0342] Similar results shown in FIG. 1F and Table 11 were obtained
in the NCI-H292 cell line in which the antibody was maintained in
culture during the incubation time (no wash-out). Again, these data
indicate rapid and significant internalization and maintenance of
downregulation of endogenous CD73.
[0343] Internalization assays were also conducted with the human
SNU-C1 (colon cancer cell line) and NCI-H1437 (non-small cell lung
carcinoma cell line) cells. The results, which are shown in FIGS.
1I and J, also indicate rapid internalization with a maximal level
reached within 5 hours and a maximal level of internalization of
about 50% for CD73.4.IgG2-C219S-IgG1.1f in SNU-C1 and 60% for
NCI-H1437 cells. FIGS. 1G and H show similar kinetics of
internalization of CD73.4.IgG2-C219S-IgG1.1f in Calu6 and NCI-H292
cells. For graphs, which show % of CD73 internalized, this number
was obtained as follows:
% CD 73 internalized = 100 - ( MFI t = x - MFI background MFI t = 0
- MFI background .times. 100 ) ##EQU00001##
where for each antibody, MFI.sub.t=x is the MFI at a given
timepoint and MFI.sub.t=0 is maximal fluorescence at t=0, and
MFI.sub.background is the MFI of the secondary Ab only.
TABLE-US-00016 TABLE 12 EC.sub.50 of antibody mediated CD73
internalization in several cell lines (data from Figures 1G-I)
SNU-C1 NCI-H1437 Calu6 NCI-H292 SNU-C1 (no wash) NCI-H1437 (no
wash) Ymax T.sub.1/2 Ymax T.sub.1/2 Ymax T.sub.1/2 Ymax T.sub.1/2
Ymax T.sub.1/2 Ymax T.sub.1/2 (%) (hr) (%) (hr) (%) (hr) (%) (hr)
(%) (hr) (%) (hr) mAb- 76.8 0.5661 77.64 0.2633 48.96 0.4954 38.39
1.025 63.12 0.3164 62.78 0.3418 CD73.4- IgG2- IgG1.1f mAb- 75.59
0.6003 78.42 0.2766 -- -- -- -- -- -- -- -- CD73.4- IgG2 mAb- 44.99
1.737 51.49 0.2087 30.58 0.9915 33.16 2.33 49.76 0.4915 49.95
0.5384 CD73.4- IgG1.1f
[0344] Thus, anti-CD73 antibodies with an IgG2 hinge internalize
faster and to a greater extent relative to anti-CD73 antibodies
with an IgG1 hinge.
Example 2: Enhanced Agonist Activity of GITR Antibodies with an
IgG2 Hinge Relative to the Same Antibodies with an IgG1 Hinge
[0345] This Example demonstrates that anti-GITR antibodies
comprising an IgG2 hinge have an increased ability to induce IL-2
and IFN-.gamma. secretion from T cells relative to the same
antibodies that have an IgG1 hinge.
[0346] It had been observed in CHO-OKT3 and 3A9 assays described
above that hybridoma derived antibodies, having an IgG2 constant
region, are more potent in stimulating cytokine secretion than the
same antibodies in which the heavy chain constant region was
switched to that of IgG1 or an effectorless IgG1 (IgG1.1).
Therefore, the effect of an IgG2 constant region or hinge was
further tested on anti-GITR antibodies in these assays.
[0347] The heavy chain variable region of an anti-human GITR
antibody (SEQ ID NO: 75) was linked to the heavy chain constant
regions shown in Table 13. The light chain of the anti-GITR
antibodies comprised SEQ ID NO: 77. Table 13 shows the identity of
each domain of the constant regions:
TABLE-US-00017 TABLE 13 Heavy chain constant regions of antibodies
used in this Example Name of SEQ ID antibody CH1 Hinge CH2 CH3 NO*
anti-GITR IgG2 IgG2 IgG2 IgG2 SEQ ID SEQ ID SEQ ID NO: 8 SEQ ID NO:
9 SEQ ID NO: 52 NO: 7 NO: 10 anti-GITR-IgG2 IgG2 IgG2 IgG2 IgG2 SEQ
ID SEQ ID SEQ ID NO: 8 SEQ ID NO: 9 SEQ ID NO: 52 NO: 7 NO: 10
anti-GITR-IgG1 IgG1 IgG1 IgG1 IgG1 SEQ ID SEQ ID SEQ ID NO: 3 SEQ
ID NO: 4 SEQ ID NO: 53 NO: 2 NO: 5 anti-GITR-IgG1.1 IgG1.1 IgG1.1
IgG1.1 IgG1.1 SEQ ID SEQ ID (L234A/L235E/G237A) (A330S/P331S) SEQ
ID NO: 54 NO: 2 SEQ ID NO: 25 SEQ ID NO: 24 NO: 5
anti-GITR-IgG2-IgG1 IgG2 IgG2/IgG1 hybrid IgG1 IgG1 SEQ ID or
anti-GITR.g2.g1 SEQ ID SEQ ID NO: 22 SEQ ID NO: 4 SEQ ID NO: 55 NO:
7 NO: 5 anti-GITR-IgG2-IgG1.1 IgG2 IgG2 IgG1.1 IgG1 SEQ ID or
anti-GITR.g2.g1.1 SEQ ID SEQ ID NO: 8 (A330S/P331S) SEQ ID NO: 56
NO: 7 SEQ ID NO: 24 NO: 5 *SEQ ID NO of full-length heavy chain
constant region
[0348] First, the binding affinities of these GITR antibodies were
compared to those of GITR antibodies having an IgG1 hinge. The
binding affinities of the anti-GITR antibodies to soluble GITR was
determined by Biacore as follows. Anti-GITR antibodies were
captured on human kappa coated chips (.about.5KRUs; Southernbiotech
cat #2060-01), and recombinant human GITR (rHGITR/Fc: R&D
systems, CAT #689-GR) was flowed across the chip at concentrations
of 500 nM, 250 nM, 125 nM, 62 nM, and 31 nM. The capture
concentration of the mAb/volume was 2-40 .mu.g/mL (5 .mu.L at 10
.mu.L/min). The antigen association time was 5 minutes at 15
.mu.L/min, the antigen dissociation time was 6 minutes, and
regeneration was performed with 50 mM HCl/50 mM NaOH (12 .mu.L each
at 100 .mu.L/min).
[0349] The results, which are shown in FIG. 2, indicate that all
three GITR antibodies having an IgG2 hinge have similar affinities
for activated T cells as GITR antibodies have IgG1 or IgG1.1
constant region.
[0350] Next, the ability of GITR antibodies having an IgG1 constant
region or IgG2 hinge/IgG1 Fc domain were tested for their ability
to induce IL-2 and IFN-.gamma. secretion from human donor T cells
stimulated with anti-CD3scFv (OKT3)-expressing CHO cells. The CHO
cells expressed low levels of OKT3 to promote suboptimal
stimulation to be able to observe agonism by anti-GITR antibodies.
CD4+ T cells from a donor were stimulated with OKT3 expressing CHO
cells and an anti-GITR antibody, and IL-2 and IFN-.gamma. secretion
was measured. The experiments were conducted as follows. For
experiments with CD4+ T cells, CD4+ T cells were obtained from
human PBMCs with RosetteSep Human CD4+ T cell enrichment cocktail
(StemCell Technology #15062) according to the manufacturer's
protocol. CHO cells expressing anti-CD3scFv (OKT3) (CHO-OKT3) were
washed twice with RPMI medium and subjected to irradiation with a
dosage of 50K Rad. Cells were harvested and resuspended in culture
medium (RPMI-1640 supplemented with 10% Fetal Bovine Serum, 2 mM
L-glutamine, 55 nM .beta.-Mercaptoethanol, 1 mM sodium pyruvate,
and 100U/mL Penicillin/streptomycin) at 2.5.times.10.sup.5/mL.
2.5.times.10.sup.4 CHO-OKT3 cells and 1.times.10.sup.5 T cells were
seeded per well in a 96-well TC grade flat-bottom plate (Costar).
Cells were incubated with an 8-point, 4-fold titration of GITR
antibody starting at 40 .mu.g/mL. An irrelevant hIgG1 was added at
40 .mu.g/mL as an isotype control. A sample with cells only was
included to show baseline activity without any treatment.
Supernatant from each sample was harvested at day 2 for IL-2
measurement (only for assays with CD4+ T cells) (BD opt EIA Human
IL-2 ELISA kit; BD Bioscience #555190) and at day 3 for IFN-.gamma.
measurement (BD optEIA human IFN-g ELISA Kit; BD Bioscience
#555142).
[0351] As shown in FIGS. 3A and B, the antibody with the IgG2
hinge/IgG1 Fc domain (anti-GITR.g2.g1) induced both IL-2 and
IFN-.gamma. secretion from T cells to a higher degree than the
antibody with the IgG1 constant region (anti-GITR.g1). Similar
results were obtained with the effectorless versions of these
constant domains (FIG. 3C).
[0352] To further confirm the increased activation of T cells with
the anti-GITR antibodies comprising an IgG2 hinge, IL-2 secretion
in a different experimental format was tested. In this experiment,
the ability of GITR antibodies to induce IL-2 secretion from
3A9-hGITR cells (mouse T cell hybridoma 3A9 cell line ectopically
expressing human GITR) was tested as follows. Mouse T cell
hybridoma 3A9 cell line which ectopically expresses human GITR
(3A9-hGITR) was cultured on anti-CD3 monoclonal antibody-coated
plates in the presence of increasing amounts of the indicated
antibodies. 5.times.10.sup.4 3A9-hGITR cells were cultured on
plates coated with 1 .mu.g/ml anti-CD3 antibody (Clone 145-2C11; BD
Biosciences), and treated with the indicated concentrations of
antibodies for 7 hours.
[0353] As shown in FIG. 4, all antibodies having the IgG2 hinge
(anti-GITR.g2, anti-GITR.g2.g1f, and anti-GITR.g2.g1.f) induced
IL-2 secretion from 3A9-hGITR cells to a higher degree than their
IgG1 constant region containing counterparts (anti-GITR.g1f and
anti-GITR.g1.1f).
[0354] These results collectively suggest that anti-GITR antibodies
having an IgG2 hinge and g1 or g1.1 constant regions are more
potent than the same antibodies having an IgG1 hinge.
Example 3: Impact of Different Hinge/Fc Combinations on Size of
Antibody/Antigen Complexes
[0355] As shown in the above Examples, anti-CD73 antibodies with an
IgG2 hinge are better inhibitors of CD73 cellular activity and
internalize better than the same antibodies with an IgG1 hinge and
anti-GITR antibodies with an IgG2 hinge are more potent agonists
than the same antibodies with an IgG1 hinge. Based on this
observation, and the fact that an IgG2 hinge is stiffer than an
IgG1 hinge, it was hypothesized that larger complexes are formed
between an antigen and antibodies having an IgG2 hinge relative to
antibodies having an IgG1 hinge. The following experiment was
conducted to analyze this hypothesis.
[0356] The structure and oligomeric state of CD73/antibody
complexes in solution were examined by SEC-MALS and DLS. For these
studies, antibodies containing either an IgG1 or IgG2 constant
region, were mixed at varying molar ratios with recombinant
proteins comprising either the full length extracellular domain of
human-CD73 containing a C-terminal polyhistidine tag (amino acid
residues 26-546 of human-CD73, termed hCD73-his) or a fragment
corresponding to the N-terminal domain of human-CD73 (amino acid
residues 26-336, termed N-hCD73-his).
[0357] The oligomeric state of CD73/antibody complexes were
examined by size-exclusion chromatography coupled to an in-line
multi-angle light scattering detector (SEC-MALS). Isocratic
separations were performed on a Shodex PROTEIN KW-803 column
connected to an Prominence Shimadzu UFLC in buffer containing 200
mM K.sub.2HPO.sub.4, 150 mM NaCl, pH 6.8, containing 0.02% Na azide
(0.1 .mu.m filtered) running at 0.5 mL/min. Samples were injected
onto the column using a SIL-20AC Prominence Shimadzu autosampler,
and data were obtained from three online detectors connected in
series: a Prominence SPD-20AD diode array UV/vis spectrophotometer
followed by a Wyatt miniDAWN.TM. TREOS Multi-Angle Light Scattering
Detector then a Wyatt Optilab T-rEX Refractive Index Detector. Data
were collected and analyzed using Astra (Wyatt) and Labsolutions
(Shimadzu) software.
[0358] Dynamic light scattering (DLS) studies were performed on a
Wyatt DynaPro plate reader in 384 well plates at 25.degree. C.
Experimental parameters were 20 acquisitions of 5 s each per
measurement, and measurements were recorded in quadruplicate, with
the average and standard deviation reported. Intensity
autocorrelation functions were fitted using the "Regularization"
algorithm in the Dynamics software (Wyatt Technologies).
[0359] A summary of the SEC-MALS and DLS is provided in FIG. 6 and
FIG. 7. Analysis of the antibodies alone, shows retention times
(about 16-17 min), masses (140-150 kDa), and hydrodynamic radii
(5.0-5.4 nm) for each antibody that are typical for a monomeric
monoclonal antibody. The data for the hCD73-his protein is
consistent with the protein adopting the expected dimeric structure
in solution; in particular, the mass determined from the SEC-MALS
data (120 kDa) is consistent with that expected for a CD73-his
dimer (117 kDa) and inconsistent with what would be expected for a
hCD73-his monomer (58.5 kDa). The data for N-hCD73 is consistent
with the recombinant N-domain protein being monomeric in solution
(SEC-MALS measured mass=38 kDa, compared to expected monomeric
mass=35.0 kDa), which is expected because the region of the full
length CD73 extracellular domain that is responsible for
dimerization of the protein is contained within the C-terminal
domain without contribution of N-domain residues.
[0360] Equimolar mixtures of a given antibody with N-hCD73-his were
found to elute as a single species in the SEC with shorter
retention time than the antibody or N-hCD73-his alone, as well as
larger hydrodynamic radii (Rh) by DLS, which is consistent with the
formation of complexes. MALS data indicate masses for these
complexes of approximately 210 kDa. This is consistent with one
N-hCD73-his molecule bound to each of the two Fab domains of a
given antibody to form a 1:2 antibody:N-hCD73-his complex.
[0361] SEC-MALS data for mixtures of anti-CD73 antibodies with
hCD73-his dimer shows that the mixture elutes earlier than either
the hCD73-his or antibody alone, suggesting that complexes are
formed. Comparing the data for mAbs that contain the same variable
region but different constant domains, shows that the elution times
for the complexes of hCD73-his with mAbs containing a IgG2 constant
domains (IgG2-C219S, IgG2-C219S-IgG1.1f) are earlier than those for
complexes of hCD73-his with mAbs containing an IgG1.1f constant
domain. In addition, the MALS-determined masses for complexes of
hCD73-his with mAbs containing an IgG2 constant domain are larger
than those for complexes of hCD73-his with mAbs containing an IgG1
constant domain. DLS data further shows that the hydrodynamic
radius of complexes of hCD73-his with mAbs containing a IgG2
constant domain are larger than those for complexes of hCD73-his
with mAbs containing an IgG1 constant domain. For example, the
SEC-MALS and DLS data for CD73.4 with three different constant
regions (IgG2-C219S, IgG2-C219S-IgG1.1f, or IgG1.1f) is shown in
FIG. 5. Here it can be seen that the complex of hCD73-his with
CD73.4 containing the IgG2 constant domain have shorter retention
times (FIG. 5A), larger hydrodynamic radii (FIG. 5B) and larger
MALS-determined masses (FIG. 5C), as compared to the complexes of
hCD73-his with CD73.4-IgG1.1f. Based on the MALS masses, a
schematic model for the structure and stoichiometry of the
complexes between hCD73-his and the antibodies is shown in FIG. 5D,
where complexes containing CD73.4-IgG1.1f predominantly form
smaller 2:2 (peak 1=.about.550 kDa) or 4:4 mAb/CD73 dimer complexes
(peak 2=.about.1300 kDa), whereas CD73.4-IgG2-C219S or
CD73.4-IgG2-C219S-IgG1.1f form much larger complexes (>3000 kDa)
with hCD73-his, for which precise structure and stoichiometry
cannot be confidently modeled.
[0362] Collectively the SEC-MALS and DLS data demonstrate that
larger complexes are formed between hCD73-his and mAbs containing
an IgG2 hinge region (IgG2-C219S or IgG2-C219S-IgG1.1f), compared
to those containing the IgG1 hinge region (IgG1.1f).
Example 4: CH1 of IgG2 Isotype Further Improves Antibody Mediated
CD73 Internalization
[0363] Additional internalization assays were conducted in Calu6
and H292 cells to further discriminate the role of isotype on
internalization. The internalization assays were conducted as
described in Example 1A and 1B (flow cytometry protocol without the
wash-out step of the antibodies), and the antibodies of varying
hybrid isotypes shown in Table 14 were maintained in culture at 10
.mu.g/mL during the incubation time. For the flow cytometry
experiments, the method of Example 1B was adapted to high
throughput analysis in 96 well plates (as opposed to 48 well
plates) and with 50,000 cells per well.
TABLE-US-00018 TABLE 14 Constant regions tested with the variable
regions of CD73.4: SEQ ID NO of Constructs constant region
Description IgG1f 78 wild type IgG1f IgG1.1f 83 standard inert
IgG1.1f IgG2.3 79 IgG2 A-form (C219S) IgG2.5 82 IgG2 B-form (C131S)
IgG2.3G1-KH 81 CH1, upper hinge and lower hinge/upper CH2 of
IgG2.3, all else IgG1f IgG2.5G1-KH 90 CH1, upper hinge and lower
hinge/upper CH2 of IgG2.5, all else IgG1f IgG2.3G1-AY 80 CH1 and
upper hinge of IgG2.3, all else IgG1f IgG2.5G1-AY 89 CH1 and upper
hinge of IgG2.5, all else IgG1f IgG1-G2.3G1-KH 93 CH1 of IgG1,
upper hinge and lower hinge/upper CH2 of IgG2.3, all else IgG1f
IgG1-G2.3G1-AY 92 CH1 of IgG1, upper hinge of IgG2.3, all else
IgG1f IgG2.3G1.1f-KH 84 CH1, upper hinge and lower hinge/upper CH2
of IgG2.3, all else IgG1.1f IgG2.5G1.1f-KH 88 CH1, upper hinge and
lower hinge/upper CH2 of IgG2.5, all else IgG1.1f IgG1-deltaTHT 85
IgG1 with THT sequence removed from hinge IgG2.3-plusTHT 86 IgG2.3
with THT sequence (from IgG1) added into hinge IgG2.5-plusTHT 91
IgG2.5 with THT sequence (from IgG1) added into hinge
IgG2.3-plusGGG 87 IgG2.3 with flexible GGG sequence added into
hinge
[0364] Fc.gamma.R binding was shown to be as expected for each
construct, i.e., Fc.gamma.R binding is driven by lower hinge/CH2
region.
[0365] The results are shown in FIGS. 8A, B and C and in Tables 15
and 16. Data shown in Table 15 were generated using the same
protocol described in Example 1B (without washing out the
antibodies). Data shown in Table 16 were generated using the same
protocol described in Example 1A.
TABLE-US-00019 TABLE 15 Ymax and T.sub.1/2 of antibody mediated
CD73 internalization in Calu6 and NCI-292 cells Calu6 NCI-H292 Ymax
Ymax (%) T.sub.1/2 (hr) (%) T.sub.1/2 (hr) mAb-CD73.4-IgG1f/LC-
55.72 0.8452 73.05 0.5014 11F11-Vk2 mAb-CD73.4-IgG2.3G1-AY- 85.07
0.3326 90.25 0.272 pTT5-SP mAb-CD73.4-IgG2.3G1-KH 81.62 0.3962
91.61 0.2801 mAb-CD73.4-G1-G2.3-G1-AY 72.7 0.4229 84.51 0.3083
mAb-CD73.4-IgG1-deltaTHT 69.27 0.5652 83.63 0.3441
mAb-CD73.4-G1-G2.3-G1-KH 65.67 0.5674 83.29 0.343
mAb-CD73.4-IgG2.3-plusTHT 81.19 0.3551 91.41 0.2935
mAb-CD73.4-IgG2.3- 81.72 0.3355 91.6 0.2712 plusGGG
mAb-CD73.4-IgG2.5 78.98 0.3485 89.56 0.3057
mAb-CD73.4-IgG2.5G1.1f-KH 79.63 0.3527 90.86 0.2993
mAb-CD73.4-IgG2.5G1-AY 81.91 0.2901 91.3 0.2452
mAb-CD73.4-IgG2.5G1-KH 76 0.2837 90.75 0.256 mAb-CD73.4- 80.15
0.2869 89.6 0.2565 IgG2.5plusTHT/LC mAb-CD73.4-IgG2-C219S/LC 82.35
0.3725 88.91 0.2866 mAb-CD73.4-IgG2-C219S/LC 82.54 0.3639 87.66
0.2845 mAb-CD73.4-IgG1.1f + K/LC 57.07 1.519 70.4 0.4969
mAb-CD73.4-IgG2CS-IgG1.1f 80.98 0.3508 90.35 0.2764
TABLE-US-00020 TABLE 16 Internalization characteristics of CD73.4
with various constant regions in Calu6 cells Internalization
CD73_mAb_Clones Max Speed CD73.4-IgG1f/LC-11F11-Vk2 + +
CD73.4-Vh-hHC-IgG2.3G1-AY-pTT5-SP5 ++++ ++++
CD73.4-Vh-hHC-IgG2.3G1-KH ++++ +++ CD73.4-Vh-hHC-G1-G2.3-G1-AY ++
++ CD73.4-Vh-hHC-G1-G2.3-G1-KH ++ ++ CD73.4-Vh-hHC-IgG1-deltaTHT ++
+++ CD73.4-Vh-hHC-IgG2.3-plusTHT ++++ ++++
CD73.4-Vh-hHC-IgG2.3-plusGGG ++++ ++++ CD73.4-Vh-hHC-IgG2.5 ++++
++++ CD73.4-Vh-hHC-IgG2.5G1.1f-KH ++ ++++ CD73.4-Vh-hHC-IgG2.5G1-AY
+++ ++++ CD73.4-Vh-hHC-IgG2.5G1-KH +++ ++++
CD73.4-Vh-hHC-IgG2.5plusTHT/LC ++++ ++++
CD73.4-Vh-hHC-IgG2-C219S/LC ++++ ++++ CD73.4-Vh-hHC-IgG2-C219S/LC
++++ ++++ CD73.4-Vh-hHC-IgG1.1f + K/LC + +
CD73.4-Vh-hCh-IgG2-C219S-IgG1.1f ++++ ++++
[0366] FIGS. 8A-C and Tables 15 and 16 indicate that antibodies
having a hinge and CH1 domain of the IgG2 isotype are most
efficient at driving internalization of CD73, whereas the
antibodies that have an IgG1 hinge and CH1 domain correspond to the
lower curves in the figure, i.e., lower extent of internalization.
In addition, antibodies with only the hinge from IgG2 have an
increased internalization compared to a human IgG1 hinge. Thus,
antibodies having a hinge and CH1 domain of the IgG2 isotype have
superior internalization characteristics relative to the antibodies
with an IgG1 isotype.
[0367] Thus, anti-CD73 antibody mAb-CD73.4-IgG2CS-IgG1.1f (having
an IgG2 hinge with C219S substitution and an IgG2 CH1 domain)
induced rapid internalization dependent on cell line tested. The
T.sub.1/2 for internalization ranged from minutes to under an hour.
Most cell lines tested had a T.sub.1/2 under 10 minutes. A nearly
complete internalization was induced for some cell lines and most
tested had at least a 50% reduction in surface CD73 expression
which typically reached maximal levels by 5 hours, much shorter in
some cases.
Example 5: IgG2 CH1 Enhances GITR Ab Induced IL-2 Secretion by CD4+
T Cells
[0368] This Example shows that a CH1 domain of the IgG2 isotype
enhances anti-GITR antibody induced T cell activity, relative to
the antibody with a CH1 domain of the IgG1 isotype.
[0369] The same modified heavy chain constant regions that were
used in Example 4 were linked to the variable regions of the
anti-GITR antibody (of Example 2). Donor CD4+ T cells were
incubated with OKT3-scFv expressing CHO cells and the various
anti-GITR antibodies, and the level of IL-2 secreted was measured.
This was conducted as described in Example 2.
[0370] The results, which are shown in FIG. 9, indicate that all
anti-GITR antibodies having a CH1 domain of the IgG2 isotype, in
addition to a hinge of the IgG2 isotype, are more effective at
stimulating IL-2 secretion from CD4+ T cells than those having an
IgG1 hinge and CH1.
[0371] Thus, this Example shows that the presence of an IgG2 hinge
and IgG2 CH1 domain in an agonist anti-GITR antibody further
enhances the agonist activity of the antibody relative to the same
antibody that does not have a hinge and/or a CH1 domain of the IgG2
isotype. An antibody having both a hinge and a CH1 domain of the
IgG2 isotype has a stronger agonist effect relative to an antibody
having a hinge, but not CH1, of the IgG2 isotype Additionally, an
antibody with a CH1 domain from IgG2 has a stronger agonist
activity than an antibody with with a CH1 domain from IgG1 isotype.
An antibody with a hinge from IgG2 and a CH1 domain from IgG1 has
stronger agonist activity than an antibody with a CH1 and hinge
from IgG1 isotype.
Example 6: Relevance of Certain Amino Acid Residues in IgG2 CH1 and
Hinge in Improving Antibody Mediated CD73 Internalization
[0372] Anti-CD73 antibodies (CD73.4) with the heavy chain constant
regions shown in Table 17 were prepared and tested as described
above in antibody mediated CD73 internalization assays.
TABLE-US-00021 TABLE 17 Heavy chain constant regions that were
fused to anti-CD73 variable regions SEQ ID NO of con- stant
Description Constructs region CH1 domain of IgG2, G2-G1-G1- 94 with
all else IgG1. G1 Also, Cys > Ser mutant G2.5-G1- 95 to reduce
potential G1-61 disulfide heterogeneity: CH1 domain of IgG1
G1-G2.3- 96 with all else IgG2.3: G2-G2 Swap CH1 regions in G1- 97
IgG1 with those of KRGEGSSNLF IgG2, either separate G1-KRGEGS 98 or
together: G1-5NLF 99 IgG1- 100 ITNDRTPR G1-5NLFPR 101 Swap CH1
regions in G2- 102 IgG2 with those of RKEGSGNSFL IgG1, either
separate G2-RKEGSG 103 or together: G2-NSFL 104 IgG2- 105 TIDNTRRP
G2-NSFLRP 106 IgG1 with CH2 domain G1-G1-G2- 107 residues of IgG2:
G1-AY G1-G1-G2- 108 G1-KH IgG2 with CH2 domain G2-G2.3- 109
residues of IgG1: G1-G2-KH G2.5-G2.3- 110 G1-G2-KH G2-G2.3- 111
G1-G2-AY G2.5-G2.3- 112 G1-G2-AY Swap hinge regions G1-G2.3- 113
between IgG1 and IgG2: G1-G1-KH G2-G1-G2- 114 G2-AY G2.5-G1- 115
G2-G2-AY G1-62-G1- 116 G1-AY G2-G1-G2- 117 G2-KH G2.5-G1- 118
G2-G2-KH Hinge truncations IgG1- 119 deltaHinge IgG2- 120
deltaHinge IgG2.5- 121 deltaHinge IgG1- 122 deltaG237 IgG2- 123
plusG237 Other IgG2.4 124 IgG2.3/4 125
The results, which are shown in FIG. 10, provide the following
information in the context of CD73 internalization: [0373] CH2
domain does not appear to have an impact as shown by [0374] a) very
little difference in internalization ability was observed between
the antibodies comprising a modified heavy chain constant region
with format "AY" (having the IgG2 hinge ERKCCVECPPCPAPPVAG (SEQ ID
NO: 8) relative to those with format "KH" (ERKCCVECPPCPAPELLGG (SEQ
ID NO: 22) (Set 5, 6 and 7); [0375] b) CH2 swaps are comparable to
wiltype G1 or G2 (Sets 5 and 6); and [0376] c) residue 237 has no
impact on internalization: neither the addition of a "G" residue to
an IgG2 hinge nor the deletion of the C terminal "G" in an IgG1
hinge affected internalization (Set 9). [0377] This suggests that
the CH2 domain does not impact internalization (i.e., the CH2
domain can be from IgG1 or IgG2); [0378] Swapping the CH1 regions
indicated in Set 3 (KRGEGSSNLF; KRGEGS; SNLF; ITNDRTPR and SNLFPR)
in IgG1 with those of IgG2 provides little benefit, i.e., the
internalization remains similar to that of IgG1; see Set 3); [0379]
Swapping the CH1 regions indicated in Set 4 (RKEGSGNSFL; RKEGSG;
NSFL; TIDNTRRP and NSFLRP) in IgG2 with those of IgG1 has variable
impact: changing NSFL has no impact, whereas the other 2 regions
(RKEGSG & RP) are involved (see Set 4). Based on the results of
Sets 3 and 4, it appears that there is an interaction between the
CH1 region and the hinge, with RKEGSG and RP regions being more
important than NSFL region; [0380] The hinge region impacts
internalization, i.e., the hinge of IgG2 provides better
internalization relative to the hinge of IgG1 (see Sets 7 and 8).
In addition, IgG1 with a deletion (G1-delta-hinge) improves
internalization over IgG1. IgG2 with a deletion (G2-delta-hinge)
provides a similar level of internalization relative to that of an
IgG2 hinge. This suggests that the hinge region impacts
internalization, which effect is enhanced by an IgG2 CH1
(G2-G1-G2-G2-AY is comparable to G1-G2-G1-G1-AY); [0381] IgG2.4
(C220S) has similar or reduced internalization compared to IgG2.3
(C219S). IgG2.3/4 (C219S/C220S) has much reduced internalization
compared to IgG2.3 or IgG2.4 alone (see Set 10). This suggests that
internalization of an antibody with an IgG2 hinge and C219S is
about the same as that of an IgG2 hinge with C220S, both of which
are much better than that of an IgG2 hinge with both C219S and
C220S; [0382] IgG2.5 (C131S mutation) has reduced internalization
compared to constructs with C131 (see Sets 1, 6 and 7). [0383]
Thus, these results indicate that the CH1 domain and the hinge are
both relevant in the antibody mediated CD73 internalization, and
that an antibody having the IgG2 sequences from these domains is
internalized with better efficacy relative to an antibody having
these regions from IgG1.
Example 7: Antibodies Having an IgG2 Hinge and/or CH1 Domain Form
High Molecular Weight Complexes
[0384] CD73.4 antibodies having the heavy chain constant regions
set forth in Table 14 were also tested for formation of high
molecular weight complexes by SEC-MALS and DLS experiments, as
described in Example 3.
[0385] Three out of the 16 antibodies in this study were previously
tested: CD73.4-IgG1.1f, CD73.4-IgG2-C219S (also called
CD73.4-IgG2.3), and CD73.4-IgG2-C219S-IgG1.1f (also called
CD73.4-IgG2.3G1.1f-KH). SEC-MALS and DLS data of the antibodies
alone showed retention times, masses, and hydrodynamic radii for
each antibody that are typical for a monomeric monoclonal antibody.
Equimolar complexes of each antibody (5.5 uM) with hCD73-his (5.5
uM) showed slower retention times for all complexes as compared to
antibody or hCD73-his alone indicating the formation of complexes.
An overlay of the SEC chromatogram data for each of the 16
complexes is shown in FIG. 11A. The chromatogram data can be
divided into 4 distinct peaks, which are shown in FIG. 11B. Peak 1
contains the largest species, with MALS-determined masses
suggesting complexes with mass equivalent of greater than 4:4
hCD73-his:mAb complexes. Peak 2 contains species with
MALS-determined masses suggesting complexes of about 2:2
hCD73-his:mAb complexes. Peak 3 is a minor species with low signal
and MALS-determined masses suggesting about 1:1 hCD73-his:mAb
complexes. Peak 4 corresponds to the elution of the mAbs alone with
MALS-determined masses consistent with free antibody. To quantitate
the relative amounts of each species, the 4 peaks of each
chromatogram were integrated as peak 1 (<12.9 min), peak 2
(12.9-15.1 min), peak 3 (15.1-16.7 min), peak 4 (16.7-19.3 min).
The integration also included an additional integrated range called
peak 5 (>19.3 min) to account for any low molecular weight
species, which were found to be negligible (<3.5% for all
complexes). The percentage of each species from this integration is
summarized in Table 18. All complexes contained a similar small
percentage of peak 3 (about 6-9%), but variable amounts of the
other peaks. Most notable is that all complexes between hCD73-his
and antibodies containing a CH1 domain from hIgG1 had a
significantly greater percentage of smaller complexes (peak 2),
whereas those containing CH1 domain from hIgG2 had a greater
percentage of larger complexes (peak 1) (Table 18 and FIG. 11C).
This suggests an important role for not only the hinge region but
also the CH1 domain in higher order complex formation.
TABLE-US-00022 TABLE 18 Retention times of CD73.4 antibodies with
modified heavy chain constant regions UV % Peak2 Peak3 Peak4 Peak1
12.9- 15.1- 16.7- Peak5 Complexes <12.9 min 15.1 min 16.7 min
19.3 min >19.3 min CD73.4-IgG2.3 + hCD73-his 37.0 23.8 7.7 28.6
2.9 CD73.4-IgG2.3G1.1f-KH + hCD73-his 36.0 23.8 7.9 29.3 3.0
CD73.4-IgG1.1f + hCD73-his 28.4 36.2 7.4 25.6 2.3 CD73.4-IgG1f +
hCD73-his 26.0 36.5 7.5 27.8 2.2 CD73.4-IgG2.3G1-AY + hCD73-his
30.2 24.3 8.1 34.4 3.0 CD73.4-IgG2.3G1-KH + hCD73-his 34.9 23.4 7.9
30.7 3.0 CD73.4-IgG1-G2.3G1-AY + hCD73-his 14.6 29.2 6.4 48.3 1.6
CD73.4-IgG1-G2.3G1-KH + hCD73-his 23.8 32.6 7.0 34.5 2.1
CD73.4-IgG1-deltaTHT + hCD73-his 28.3 35.4 7.0 26.9 2.4
CD73.4-IgG2.3-plusTHT + hCD73-his 30.6 24.3 8.3 33.7 3.2
CD73.4-IgG2.3-plusGGG + hCD73-his 30.0 23.9 8.2 34.9 2.9
CD73.4-IgG2.5 + hCD73-his 31.7 24.4 8.4 32.5 3.1
CD73.4-IgG2.5G1.1f-KH + hCD73-his 30.7 24.3 8.9 32.7 3.4
CD73.4-IgG2.5G1-AY + hCD73-his 26.3 24.8 8.1 38.3 2.6
CD73.4-IgG2.5G1-KH + hCD73-his 21.4 24.1 7.0 45.6 1.9
CD73.4-IgG2.5-plusTHT + hCD73-his 32.6 23.5 8.3 32.6 3.0
Example 8: Fc Receptor Binding for Antibodies with Engineered
Constant Domains
[0386] This Example demonstrates that antibodies having modified
heavy chain constant regions comprising the CH1 and hinge of IgG2
bind to Fc.gamma.Rs when they contain CH2 and CH3 domains of
IgG1.
[0387] In addition to antigen binding by the variable domains,
antibodies can engage Fc-gamma receptors (FcgRs) through
interaction with the constant domains. These interactions mediate
effector functions such as antibody-dependent cellular cytotoxicity
(ADCC) and antibody-dependent cellular phagocytosis (ADCP).
Effector function activity is high for the IgG1 isotype, but very
low or absent for IgG2 and IgG4 due to these isotypes having lower
affinity for FcgRs. In addition, the effector function of IgG1 can
be modified through mutation of amino acid residues within the
constant regions to alter FcgR affinity and selectivity.
[0388] The binding of antibodies to Fc gamma receptors (Fc.gamma.Rs
or FcgRs) was studied using biosensor technologies including
Biacore surface plasmon resonance (SPR) and Fortebio Biolayer
Interferometry (BLI). SPR studies were performed on a Biacore T100
instrument (GE Healthcare) at 25.degree. C. The Fab fragment from a
murine anti-6.times.His antibody was immobilized on a CM5 sensor
chip using EDC/NHS to a density of .about.3000 RU. Various
his-tagged FcgRs (7 ug/ml) were captured via the C-terminal his-tag
using a contact time of 30 s at 10 ul/min, and the binding of 1.0
uM antibody was evaluated in a running buffer of 10 mM NaPO4, 130
mM NaCl, 0.05% p20 (PBS-T) pH 7.1. FcgRs used for these experiments
included CD64 (FcgRI), CD32a-H131 (FcgRIIa-H131), CD32a-R131
(FcgRIIa-R131), CD32b (FcgRIIb), CD16a-V158 (FcgRIIIa-V158),
CD16b-NA1 (FcgRIIIb-NA1), and CD16B-NA2 (FcgRIIIb-NA2). BLI
experiments were performed on a Fortebio Octet RED instrument
(Pall, Fortebio) at 25.degree. C. in 10 mM NaPO4, 130 mM NaCl,
0.05% p20 (PBS-T) pH 7.1. Antibodies were captured out of undiluted
expression supernatants on protein A coated sensors, followed by
the binding of 1 uM hCD32a-H131, hCD32a-R131, hCD32b, hCD16a-V158,
or 0.1 uM hCD64 analytes.
[0389] First, antibodies binding to various targets were made that
contain modified IgG1 Fc domains including the substitutions S267E
(SE) and S267E/L328F (SELF), as well as various combinations of the
mutations P238D, P271G, H268D, A330R, G237D, E233D, referred to as
V4, V7, V8, V9 and V12. The binding of these antibodies was studied
by Biacore SPR with comparison to IgG1f, IgG2.3 (IgG2-C219S) and
IgG4.1 (IgG4-S228P) antibodies, as well as an IgG1.1f antibody
which has been engineered to reduce binding to all FcgRs. The
results, which are shown in FIG. 12, demonstrate the expected FcgR
binding properties for IgG1f, IgG2.3 and IgG4.1 and the mutated
IgG1 antibodies, including increased CD32a-H131, CD32a-R131 and
CD32b binding for SE and SELF, as well as increased selectivity of
the V4, V7, V8, V9 and V12 mutants for CD32b over CD32a-H131 and
CD32a-R131, FIG. 12.
[0390] The next set of constructs were used to engineer effector
function into the otherwise effector function negative IgG2
isotype. For this study, the mutations described above were
introduced in the context of IgG2.3 constant region, or an
IgG2.3/IgG1f hybrid termed IgG2.3G1-AY, Table 19. Antibodies were
expressed at small scale as supernatants, and tested for binding to
FcgRs using Fortebio Octet BioLayer Interferometry biosensor
technology. Since the antibodies were present at low concentration
in the supernatants, the experiment was performed by capturing
antibodies out of the supernatants using protein A coated sensors,
followed by binding of FcgR analytes in solution. Purified and
supernatant control IgG1f including wild type IgG1, SE, P238D, V4
and V12 antibodies were also included for comparison, and each of
these control antibodies demonstrated expected FcgR binding
properties, FIG. 13. The IgG2.3 antibody also demonstrated the
expected binding profile, with appreciable binding to only
CD32a-H131. However, all mutations to introduce S267E, L328F,
P238D, P271G, H268D, A330R, G237D, or E233D mutations into IgG2.3
failed to recapitulate the FcgR affinity of the corresponding
engineered IgG1 mAbs, FIG. 13. In contrast, the IgG2.3G1-AY
construct was able to fully preserve the FcgR binding properties of
wild type IgG1, while retaining the CH1 and hinge regions of
IgG2.3. In addition, all IgG2.3G1-AY mutants containing S267E,
L328F, P238D, P271G, H268D, A330R, G237D, and E233D demonstrated
FcgR binding properties comparable to the IgG1 version mAbs
containing the same mutations, FIG. 13. This demonstrates the
successful engineering of antibodies with CH1 and hinge regions of
IgG2 combined with effector function of wild type or mutant
IgG1.
TABLE-US-00023 TABLE 19 Engineered IgG2 constructs Set ID Construct
Seq ID# 1 IgG2.3 hHC-IgG2-C219S 79 IgG2.3-V13 hHC-IgG2-C219S-P238D
152 IgG2.3-V14 hHC-IgG2-C219S-P238D, P271G 153 IgG2.3-V15
hHC-IgG2-C219S-P238D, H268D, 154 P271G IgG2.3-V16
hHC-IgG2-C219S-P238D, P271G, 155 A330R IgG2.3-V17
hHC-IgG2-C219S-P238D, H268D, 156 P271G, A330R IgG2.3-V18
hHC-IgG2-C219S-S267E 157 IgG2.3-V19 hHC-IgG2-C219S-S267E, L328F 158
2 IgG2.3G1 hHC-IgG2-C219S/hHC-IgG1f 159 IgG2.3G1-AY-V20
hHC-IgG2-C219S/hHC-IgG1f-P238D 160 IgG2.3G1-AY-V21
hHC-IgG2-C219S/hHC-IgG1f-P238D, 161 P271G IgG2.3G1-AY-V22
hHC-IgG2-C219S/hHC-IgG1f - 162 P238D, H268D, P271G IgG2.3G1-AY-V23
hHC-IgG2-C219S/hHC-IgG1f- 163 P238D, P271G, A330R IgG2.3G1-AY-V24
hHC-IgG2-C219S/hHC-IgG1f- 164 P238D, H268D, P271G, A330R
IgG2.3G1-AY-V25 hHC-IgG2-C219S/hHC-IgG1f- 165 G237D, P238D, H268D,
P271G, A330R IgG2.3G1-AY-V26 hHC-IgG2-C219S/hHC-IgG1f- 166 E233D,
G237D, P238D, H268D, P271G, A330R IgG2.3G1-AY-V27
hHC-IgG2-C219S/hHC-IgG1f-S267E 167 IgG2.3G1-AY-V28
hHC-IgG2-C219S/hHC-IgG1f-S267E, 168 L328F
[0391] This engineering strategy was further explored by producing
other antibodies formatted with IgG2.3G1-AY, IgG2.3G1-AY-S267E
(IgG2.3G1-AY-V27), as well as IgG2-B-form variants (IgG2.5G1-AY and
IgG2.5G1-AY-V27), and other hybrid antibodies containing different
combinations of IgG1 and IgG2 constant domains, and testing the
binding of these antibodies to anti-his Fab captured his-tagged
FcgRs using Biacore SPR technology. In agreement with the Octet
supernatant data, the SPR data showed that the IgG2.3G1-AY and
IgG2.3G1-AY-V27 antibodies had comparable FcgR binding properties
to IgG1f and IgG1f-S267E respectively, despite containing the CH1
and hinge regions of an A-form IgG2 antibody (IgG2.3) (FIGS. 14A
and B and Table 20). Similar data was also obtained using
IgG2.5G1-AY and IgG2.5G1-AY-V27 antibodies, demonstrating the
successful engineering of B-form IgG2 antibodies (containing C131S
mutation termed IgG2.5) having IgG1f or modified IgG1f like
effector functions. Data for several other antibodies with
IgG2.3G1-AY, IgG2.3G1-AY-V27, IgG2.5G1-AY, or IgG2.5G1-AY-V27
constant regions but different variable regions shows that this
engineering strategy is broadly applicable to other antibodies
independent of the variable domains (FIGS. 14A and B and Table 20).
Other constructs that demonstrate IgG1f-like FcgR binding
properties are IgG1-G2.3G1-AY, and IgG1deltaTHT, whereas several of
the modified constant region constructs were unable to retain
IgG1f-like FcgR binding properties, including IgG2.3G1-KH,
IgG2.5G1-KH, IgG2.3plusTHT, IgG2.5plusTHT and IgG2.3plusGGG
constructs, (FIGS. 14A and B and Table 20).
TABLE-US-00024 TABLE 20 % Rmax values for 1 uM antibodies binding
to anti-his Fab captured FcgR-his proteins hCD32a- hCD32a- hCD16a-
hCD16B- mAb hCD64 H131 R131 hCD32b V158 NA2 mAb8-IgG1f 80% 82% 51%
27% 51% 21% mAb9-IgG1f 70% 33% 19% 4% 28% 10% CD73.4-IgG1f 65% 46%
26% 6% 43% 17% GITR.6-IgG1f 66% 35% 25% 8% 41% 19% CD73.4-IgG1.1f
2% 0% 2% 1% 0% 0% GITR.6-IgG1.1f 2% 0% 3% 1% 0% 0% mAb11-IgG2.3 2%
44% 17% 5% 1% 0% CD73.4-IgG2.3 3% 48% 11% 1% 1% 0% mAb6-IgG2.3 3%
66% 14% 3% 1% 0% GITR.6-IgG2.3 4% 40% 10% 1% 2% 0% mAb4-IgG2.3 1%
39% 6% 1% 1% 0% mAb5-IgG2.3 6% 100% 30% 4% 3% 0% mAb12-IgG2.3 2%
39% 7% 1% 1% 0% mAb13-IgG2.3 2% 40% 7% 1% 1% 0% mAb11-IgG2.5 0% 40%
13% 3% 0% -1% mAb7-IgG2.5 4% 72% 19% 2% 2% 0% mAb8-IgG2.5 3% 59%
14% 3% 2% 0% mAb10-IgG2.5 1% 29% 5% 1% 1% 0% CD73.4-IgG2.5 3% 40%
7% 1% 1% 0% mAb6-IgG2.5 3% 75% 17% 4% 2% 0% GITR.6-IgG2.5 4% 43%
13% 2% 2% 1% mAb4-IgG2.5 2% 46% 8% 1% 1% 0% mAb5-IgG2.5 6% 89% 26%
5% 4% 1% mAb12-IgG2.5 1% 36% 6% 1% 1% 0% mAb13-IgG2.5 -2% 39% 4%
-2% 0% -2% mAb8-IgG2.3G1-AY 77% 61% 38% 10% 38% 13%
mAb10-IgG2.3G1-AY 67% 23% 14% 4% 24% 8% CD73.4-IgG2.3G1-AY 65% 38%
20% 5% 38% 14% GITR.6-IgG2.3G1-AY 66% 43% 33% 16% 42% 21%
mAb7-IgG2.5G1-AY 80% 73% 45% 12% 47% 19% mAb8-IgG2.5G1-AY 77% 70%
45% 17% 48% 22% CD73.4-IgG2.5G1-AY 65% 43% 24% 7% 40% 16%
GITR.6-IgG2.5G1-AY 65% 38% 27% 10% 41% 19% CD73.4-IgG2.3G1-KH 2%
15% 2% 0% 2% 0% GITR.6-IgG2.3G1-KH 3% 13% 3% 0% 3% 1%
CD73.4-IgG2.5G1- KH 2% 17% 2% 0% 3% 0% GITR.6-IgG2.5G1- KH 2% 15%
3% 0% 3% 1% CD73.4-IgG2.3G1.1f-KH 1% 10% 1% 0% 1% 0%
GITR.6-IgG2.3G1.1f-KH 2% 9% 2% 0% 1% 0% CD73.4-IgG2.5G1.1f-KH 1% 6%
1% 0% 1% 0% GITR.6-IgG2.5G1.1f-KH 3% 15% 4% 0% 2% 0%
mAb7-IgG2.3G1-AY-V27 84% 68% 92% 76% 26% 7% mAb8-IgG2.3G1-AY-V27
78% 67% 80% 67% 24% 7% mAb10-IgG2.3G1-AY-V27 69% 24% 57% 40% 12% 3%
mAb7-IgG2.5G1-AY-V27 81% 74% 89% 84% 32% 9% mAb8-IgG2.5G1-AY-V27
77% 76% 79% 77% 33% 10% CD73.4-IgG1-G2.3G1-AY 66% 50% 31% 10% 48%
23% GITR.6-IgG1-G2.3G1-AY 66% 36% 25% 7% 42% 19%
CD73.4-IgG1-G2.3G1-KH 2% 18% 2% 0% 4% 1% GITR.6-IgG1-G2.3G1-KH 2%
21% 2% 0% 5% 1% CD73.4-IgG1deltaTHT 65% 43% 23% 6% 42% 17%
GITR.6-IgG1deltaTHT 66% 57% 42% 17% 48% 27% CD73.4-IgG2.3plusTHT 3%
42% 8% 1% 1% 0% GITR.6-IgG2.3plusTHT 6% 45% 17% 2% 3% 1%
CD73.4-IgG2.5plusTHT 2% 34% 7% 1% 1% 0% GITR.6-IgG2.5plusTHT 5% 44%
15% 2% 3% 1% CD73.4-IgG2.3plusGGG 3% 43% 8% 1% 1% 0%
GITR.6-IgG2.3plusGGG 6% 45% 17% 2% 3% 1%
[0392] Taken together these data show that the sequence immediately
C-terminal to the conserved CPPCPAP motif in the hinge region
confers FcgR-mediated effector function, whereas the CH1 and upper
portions of the hinge of the antibody can be replaced with IgG2 or
modified IgG2 sequences, to potentially combine the effector
functions of IgG1 and modified IgG1 with the superior
internalization or signaling properties of antibodies containing
IgG2 CH1 and/or hinge regions.
Example 9: GITR Agonist Ab Internalization is Enhanced in
Antibodies Having an IgG2 Hinge and CH1 Domain
[0393] To induce GITR expression, cells were incubated for 72h at
37.degree. C. with 20 ng/ml anti-CD3+1000 ng/ml CD28. As an
alternate method of T-cell activation, large batches of activated
CD4.sup.+ T-cells were prepared by a three stage culture protocol.
Briefly, CD4.sup.+ T-cells were stimulated with plate bound CD3
(1.5ug/ml) supplemented with 1ug/ml soluble CD28 for 72h at
37.degree. C., expanded in culture for 14 days in the presence of
20 u/ml IL2 and finally exposed to another round of activation by
addition of 10ug/ml PHA, 2u/ml IL2 and 1ug/ml CD28 for 72h at
37.degree. C. Stimulated T cells were seeded into 384 well PDL
imaging plates for 2h to adhere the cells, cooled for 15 min at
4.degree. C., and then alexa 488 labeled GITR antibodies were added
separately for 1h. Plates were finally imaged by HCS and the data
were reported as total intensity per cell. Three different GITR
antibodies have been evaluated using the above mentioned T cell
activation methods. They are GITR.6 antibody as a G1 isotype and an
inert (IgG1.1) isotype unable to bind to Fc receptors, as well as a
chimera with the IgG2 hinge in place of the IgG1 hinge.
[0394] GITR antibody induced internalization was assessed in CD3
stimulated CD4+ T-cells using the alexa quench assay format.
Freshly obtained CD4 positive T cells were incubated under as
described above to induce GITR expression. After stimulation, cells
were resuspended into fresh media and plated for internalization
assays as follows. Cells were incubated with antibody as described
above, washed with warm media and incubated at 37.degree. C. for
the indicated times prior to fixation and quenching. Internalized
antibody was measured as increased fluorescence above the small
unquenchable signal observed at time zero and then normalized
against the total fluorescence "unquenched control" initially bound
to the cells. As shown in FIG. 15, GITR ligation resulted in rapid
internalization peaking between 30-60 minutes for each antibody
tested while control antibodies were found to maintain localization
to the plasma membrane. The results indicate that the IgG2 hinge
region enhances GITR ligation induced internalization.
[0395] To further dissect the detailed mechanisms of
internalization and associated dynamics, antibody endocytosis and
delivery into early endosome compartments was analyzed. In this
experiment, cells were subjected to pulse chase analysis with
unlabeled antibodies. Upon fixation, cells were permeabilized and
stained for the early endosome marker EEA1 (cell signaling
technology), washed and then detected with alexa fluor-488
conjugated anti-rabbit secondary antibody (EEA1) and alexa
fluor-647 conjugated anti-human antibody (GITR). Plates were imaged
on an Opera confocal system with a 60.times. water immersion
objective. The results indicated clear segregation between the
membrane bound anti-GITR antibody staining and intracellular EEA1
signal. Upon warming the cultures, clustering for some antibodies
was detected that appears to co-localize with endosomal proteins.
Quantification of endosomal co-localization was performed using HCS
Studio Software and the results are plotted as the ratio of
colocalized pixel intensity relative to total staining (FIG. 16).
The colocalization of GITR antibody and early endosome is most
prominent at 30 minutes. At this tested time point, GITR.6.G2.G1f
showed a higher fraction colocalized than the GITR.6.G1f antibody.
The colocalization results correlate with the observations made
using the alexa quenching method described above and support a
model suggesting the G2 hinge has potential advantage over G1 for
inducing GITR internalization.
Example 10: GITR Agonist Ab Signaling in T Cell Receptor Activated
CD4+ and CD8+ T Cells is Enhanced in Antibodies Having an IgG2
Hinge and CH1 Domain
[0396] To further investigate the mechanisms for anti-GITR agonist
antibodies, several signaling pathways involved in T cell
activation, such as NFkB and P38 signaling pathways, were
monitored.
[0397] CD4+ and CD8+ T cells from a healthy donor (M6576) were
activated with plate-coated 0.4 .mu.g/ml anti-CD3 and 0.4 .mu.g/ml
anti-CD28. After 3 days, cells were collected and plated onto
384-well image plates for signaling activation. After cells settled
in the plate for 2 hours, they were treated with GITR antibodies
for 15 minutes and the signaling events were terminated by adding
formaldehyde to a final of 10% into the assays plate. Then the
cells were permeabilized and stained with phosphor-p65 NFKB
antibody for signaling detection. As shown in FIG. 17, GITR.6.G2
and GITR.6.G2.G1f antibodies had higher signaling responses
compared to the GITR.6.G1f in both CD4+ and CD8+ T cells. Although
there is no direct evidence of linking internalization and
signaling pathway activation, it is intriguing to note that G2
isotype seems to improve both aspects of antibody functional
activities compared to the IgG1 for GITR.6.
[0398] To quantify the signaling activities for each antibody, both
EC50 and Emax for each antibody were calculated, since both
parameters are critical to capture the full extent of the signaling
event. The response level of GITR.6.G2.G1f is chosen to be the 100%
control, and all other antibodies were normalized against it. As
shown in Table 21 for both CD4+ and CD8+ T cell populations
activated by anti-CD3 and anti-CD28 antibodies, there were a range
of activities for GITR antibodies in terms of both potency (EC50s)
and efficacy (Emax %). Although GITR.6.G2, GITR.6.G2.G1f and
GITR.6.G1f showed similar potencies (EC50s) around 10 nM range, the
efficacy (Emax) was quite different for different isotypes,
suggesting G1 antibody does not signal as effectively as the G2 or
chimeric isotypes.
TABLE-US-00025 TABLE 21 Summary of the GITR HuMab NFKB Signaling
activities in TCR Activated CD4+ and CD8+ T Cells CD4+ T cells CD8+
T cells Antibody EC50 (nM) Emax (%) EC50 (nM) Emax (%) GITR.6.G2
12.8 69 9.00 85 GITR.6.G2.Gif 9.00 100 3.77 92 GITR.6.G1f 7.3 10.8
20.05 27 hIgG1 Isotype Control Inactive 4 Inactive 6
[0399] To further confirm if the signaling difference of GITR.6.G2
and GITR.6.G2.G1f compared to GITR.6.G1f is limited to NFkB
signaling only or if it holds true for other signaling events as
well, a P38MAPK signaling readout was explored. As shown in FIG.
18, GITR.6.G2 and GITR.6.G2.G1f antibodies had higher signaling
responses compared to the GITR.6.G1f antibody in a CD4+ cell p38
MAPK activation assay. Therefore the better signaling activities
for GITR.6 G2 isotype compared with G1 isotype is not only limited
to NFkB signaling.
[0400] In addition to enhanced agonist activity and
internalization, it was also shown that modified heavy chain
constant regions can impart enhanced ADCC (to, e.g., an agonist of
a stimulatory receptor), as well as provide a new activity to an
antibody. For example, it was found that changing the constant
heavy chain domain of an antibody that binds to an inhibitory cell
surface molecule and prevents the inhibitory activity of the cell
surface molecule (an antagonist) to a modified heavy chain constant
region described herein, resulted in the antibody losing its
ability to be an antagonist, and instead endowed it with agonist
activity (of the inhibitory activity).
Example 11: Confirmation of Disulfide Bonds of IgG2.3 and IgG2.5
Constructs
[0401] The disulfide bond structures in an antibody comprising the
constant domain IgG2.3 (A form), IgG2.3G1 (A form) and IgG2.5
(B-form) were confirmed to be correct by comparison of non-reduced
to reduced Lys-C digests.
[0402] The antibody samples were digested with Lys-C which
specifically cleaves peptide bonds on the carboxyl-terminal side of
Lysine (K, Lys) residues. Peptides in the digest were separated
using a Waters ACQUITY BEH C18 column, 1.7.mu.m, 2.1.times.150 mm,
reverse phase HPLC column and detected with an ultraviolet (UV)
detector at 214 nm and Thermo LTQ mass spectrometer.
[0403] Lys-C enzymatic digestion and reduction of disulfide bonds:
To a vial containing 100 .mu.g of the antibody sample, 120 .mu.L
denature buffer was added, resulting in a 3.7M GuHCl, 0.2M Tris pH
7.0 solution. The mixture was incubated at 55.degree. C. for 30
minutes. Alkylation of protein was done by adding 1 .mu.l 50 mM
Iodoacetamide in the above solution, then incubation in the dark at
room temperature for 30 minutes. Alkylated sample was diluted with
80 .mu.L dH2O and Waco Lys-C was added at enzyme to substrate ratio
as 1:10. The antibodies were digested overnight in the dark at room
temperature. After digestion, a 100 .mu.L aliquot was removed from
the Lys-C digested sample and 10 .mu.L of 0.5M DTT was added in.
This sample was incubated at room temperature for 1 hour to reduce
the disulfide bonds.
[0404] The results obtained are as follows:
[0405] Disulfide structure of the IgG2.3 and IgG2.3G1 antibodies (A
form): Within the Fab region of the heavy chain Cys22 (H) is linked
to Cys98 (H) and Cys151 (H) is linked to Cys 207(H). Within the Fc
region of the heavy chain Cys265(H) is linked to Cys325 (H) and
Cys371 (H) is linked to Cys429 (H). Within the Fab region of the
light chain Cys23 (L) is linked to Cys88 (L) and Cys134 (L) is
linked to Cys194 (L). The C-terminal of light chain Cys214 (L) is
linked to the heavy chain at Cys138 (H). The hinge region of the
heavy chain contains three cysteine residues Cys227 (H), Cys230 (H)
and Cys233 (H), which provide three inter-chain disulfide bonds.
The most likely linkage is Cys227 (H) to Cys227 (H), Cys230 (H) to
Cys230 (H) and Cys233 (H) to Cys233 (H) which is the correct
theoretical disulfide arrangement of IgG2 A form.
[0406] Disulfide structure of the IgG2.5 antibody (B form): Within
the Fab region of the heavy chain Cys22 (H) is linked to Cys98 (H)
and Cys151 (H) is linked to Cys207(H). Within the Fc region of the
heavy chain Cys264(H) is linked to Cys324 (H) and Cys370 (H) is
linked to Cys428 (H). Within the Fab region of the light chain
Cys23 (L) is linked to Cys88 (L) and Cys134 (L) is linked to Cys194
(L). The hinge region of the heavy chain contains four cysteine
residues Cys226(H), Cys227 (H), Cys230 (H) and Cys233 (H). The
C-terminal of light chain Cys214 (L) is linked to a cysteine
residue of heavy chain in the hinge region, and rest three cysteine
residues provide three inter-chain disulfide bonds. The most likely
linkage is Cys214 (L) to Cys226 (H), then Cys227 (H) to Cys227 (H),
Cys230 (H) to Cys230 (H) and Cys233 (H) to Cys233 (H), which is the
correct theoretical disulfide arrangement of IgG2 B form.
Additionally, the disulfide linkages in the hinge region were
confirmed using electron transfer dissociation (ETD) triggered
tandem mass spectrometry using an ion trap mass spectrometer.
Example 12: Relevance of Certain Amino Acid Residues in IgG2 CH1
and Hinge in Improving GITR Agonism on T Cells
[0407] Anti-GITR antibodies (GITR.6) with the heavy chain constant
regions shown in Table 17 were prepared and tested in IL-2
production assays as described in Example 2, but in which
supernatants were harvested at 40 hours rather than 48 hours.
[0408] The results, which are shown in FIG. 20A-D, were largely in
agreement with the CD73 internalization results (see FIG. 10)
obtained with anti-CD73 antibodies having the same heavy chain
constant regions as those used in this Example.
TABLE-US-00026 SEQUENCE TABLE SEQ ID NO Description Sequence 1
Full-length IgG1 wild- ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
type TVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQ
TYICNVNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGP
SVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVD
GVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCK
VSNKALPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVS
LTCLVKGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFL
YSKLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 2 CH1 IgG1 wild-type
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN VNHKPSNTKVDKKV 3 Hinge
IgG1 wild-type EPKSCDKTHTCPPCPAPELLGG 4 CH2 IgG1 wild-type
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYV
DGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKC KVSNKALPAPIEKTISKAK 5
CH3 IgG1 wild-type GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWE
SNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQQGNVFS
FSCSVMHEALHNHYTQKSLSLSPGK 6 Full-length IgG2 wild-
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN type
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 7 CH1 IgG2 wild-type
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN VDHKPSNTKVDKTV 8 Hinge
IgG2 wild-type ERKCCVECPPCPAPPVAG 9 CH2 IgG2 wild-type
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYV
DGVEVHNAKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKC KVSNKGLPAPIEKTISKTK 10
CH3 IgG2 wild-type GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWE
SNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQGNVFS CSVMHEALHNHYTQKSLSLSPGK
11 Full-length IgG3 wild-
ASTKGPSVFPLAPCSRSTSGGTAALGCLVKDYFPEPVTVSWN type
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCN
VNHKPSNTKVDKRVELKTPLGDTTHTCPRCPEPKSCDTPPPC
PRCPEPKSCDTPPPCPRCPEPKSCDTPPPCPRCPAPELLGGP
SVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFKWYVD
GVEVHNAKTKPREEQYNSTFRVVSVLTVLHQDWLNGKEYKCK
VSNKALPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVS
LTCLVKGFYPSDIAVEWESSGQPENNYNTTPPMLDSDGSFFL
YSKLTVDKSRWQQGNIFSCSVMHEALHNRFTQKSLSLSPGK 12 CH1 IgG3 wild-type
ASTKGPSVFPLAPCSRSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCN VNHKPSNTKVDKRV 13 Hinge
IgG3 wild-type ELKTPLGDTTHTCPRCPE 14 CH2 IgG3 wild-type
PKSCDTPPPCPRCPEPKSCDTPPPCPRCPEPKSCDTPPPCPR
CPAPELLGGPSVFLFPPKPKDTLMISRTPEVTCVVVDVSHED
PEVQFKWYVDGVEVHNAKTKPREEQYNSTFRVVSVLTVLHQD
WLNGKEYKCKVSNKALPAPIEKTISKTK 15 CH3 IgG3 wild-type
GQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIAVEWE
SSGQPENNYNTTPPMLDSDGSFFLYSKLTVDKSRWQQGNIFS CSVMHEALHNRFTQKSLSLSPGK
16 Full-length IgG4 wild-
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN type
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTKTYTCN
VDHKPSNTKVDKRVESKYGPPCPSCPAPEFLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSQEDPEVQFNWYVDGVEVHNAK
TKPREEQFNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKGLPS
SIEKTISKAKGQPREPQVYTLPPSQEEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSRLTVDK
SRWQEGNVFSCSVMHEALHNHYTQKSLSLSLGK 17 CH1 IgG4 wild-type
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTKTYTCN VDHKPSNTKVDKRV 18 Hinge
IgG4 wild-type ESKYGPPCPSCPAPEFLGG 19 CH2 IgG4 wild-type
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSQEDPEVQFNWYV
DGVEVHNAKTKPREEQFNSTYRVVSVLTVLHQDWLNGKEYKC KVSNKGLPSSIEKTISKAK 20
CH3 IgG4 wild-type GQPREPQVYTLPPSQEEMTKNQVSLTCLVKGFYPSDIAVEWE
SNGQPENNYKTTPPVLDSDGSFFLYSRLTVDKSRWQEGNVFS CSVMHEALHNHYTQKSLSLSLGK
21 Modified IgG2 Hinge ERKSCVECPPCPAPPVAG (C219S) 22 IgG2/IgG1
hybrid hinge ERKCCVECPPCPAPELLGG 23 IgG2 C219S/IgG1 hybrid
ERKSCVECPPCPAPELLGG hinge 24 Modified CH2 IgG1
PSVFLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYV (A330S/P331S)
DGVEVHNAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKC KVSNKALPSSIEKTISKAK 25
IgG1.1 Hinge EPKSCDKTHTCPPCPAPEAEGA (L234A/L235E/G237A) 26
IgG1-IgG2-IgG1 ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN (IgG1-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG2/IgG1(SEQ#22)-
VNHKPSNTKVDKKVERKCCVECPPCPAPELLGGPSVFLFPPK IgG1-IgG1)
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 27 IgG1-IgG2-IgG12
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN (IgG1-IgG2(SEQ#8)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1-IgG1)
VNHKPSNTKVDKKVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 28 IgG2-IgG1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (IgG2-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG2/IgG1(SEQ#22)-
VDHKPSNTKVDKTVERKCCVECPPCPAPELLGGPSVFLFPPK IgG1-IgG1)
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 29 IgG2-IgG12
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (IgG2-IgG2(SEQ#8)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG1-IgG1)
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 30 IgG1-IgG2-IgG1.1
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN (IgG1-IgG2(SEQ#8)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1(A330S/P331S)-
VNHKPSNTKVDKKVERKCCVECPPCPAPPVAGPSVFLFPPKP IgG1)
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 31 IgG2-IgG1.1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (IgG2-IgG2(SEQ#8)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG1 (A330S/P331S)-
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP IgG1)
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 32 IgG1-IgG2CS-IgG1
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN (IgG1-IgG2(C219S)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1-IgG1)
VNHKPSNTKVDKKVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 33 IgG1-IgG2CS-IgG12
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN (IgG1-IgG2(C219S)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1-IgG1)
VNHKPSNTKVDKKVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 34 IgG2CS-IgG1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (IgG2-IgG2(C219S)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG1-IgG1)
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 35 IgG2CS-IgG12
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (IgG2-IgG2(C219S)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG1-IgG1)
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 36 IgG1-IgG2CS-IgG1.1
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN (IgG1-IgG2(C219S)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1(A330S/P331S)-
VNHKPSNTKVDKKVERKSCVECPPCPAPPVAGPSVFLFPPKP IgG1)
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 37 IgG2CS-IgG1.1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (IgG2-IgG2(C219S)-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG1(A330S/P331S)-
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP IgG1)
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 38 Ab 11F11 VH
QVQLVESGGGVVQPGRSLRLSCATSGFTFSNYGMHWVRQAPG
KGLEWVAVILYDGSNKYYPDSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSS 39 Ab 4C3 VH
EVQLVESGGGLVQPGRSLRLSCAASGFTFDDYAMHWVRQAPG
KGLEWVSGISWKSGSIGYADSVKGRFTISRDNAKNSLYLQMN
SLRAEDTALYYCVKGYYVILTGLDYWGQGTLVTVSS 40 Ab CD73.10 VH
QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMHWVRQAPG
KGLEWVAVIWYDESNKYYPDSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSS 41 Ab CD73.3 VH
EVQLVESGGGLVQPGRSLRLSCAASGFTFDDYAMHWVRQAPG (4C3/V94A)
KGLEWVSGISWKSGSIGYADSVKGRFTISRDNAKNSLYLQMN
SLRAEDTVLYYCVKGYYVILTGLDYWGQGTLVTVSS 42 Ab 6E11 VH
EVQLVESGGALVQPGRSLRLSCAASGFTFDDYAMHWVRQAPG
KGLEWVSGITWNSGGIGYADSVKGRFTISRDNAKNSLYLQMN
SLRAEDTALYYCAKDRYYSSWLLFDNWGQGILVTVSS 43 Ab CD73.4 VH
QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMHWVRQAPG
KGLEWVAVILYDGSNKYYPDSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSS 44 Ab 11F11 full-length HC
QVQLVESGGGVVQPGRSLRLSCATSGFTFSNYGMHWVRQAPG
KGLEWVAVILYDGSNKYYPDSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSSASTKG
PSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALT
SGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKP
SNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKPKDTLM
ISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKTKPREE
QFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKTI
SKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIA
VEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQG
NVFSCSVMHEALHNHYTQKSLSLSPGK 45 Ab 4C3 full-length HC
EVQLVESGGGLVQPGRSLRLSCAASGFTFDDYAMHWVRQAPG
KGLEWVSGISWKSGSIGYADSVKGRFTISRDNAKNSLYLQMN
SLRAEDTALYYCVKGYYVILTGLDYWGQGTLVTVSSASTKGP
SVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTS
GVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPS
NTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPKD
TLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKP
REEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIE
KTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYPS
DIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRW
QQGNVFSCSVMHEALHNHYTQKSLSLSPGK 46 Ab 6E11 full-length HC
EVQLVESGGALVQPGRSLRLSCAASGFTFDDYAMHWVRQAPG
KGLEWVSGITWNSGGIGYADSVKGRFTISRDNAKNSLYLQMN
SLRAEDTALYYCAKDRYYSSWLLFDNWGQGILVTVSSASTKG
PSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALT
SGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKP
SNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLFPPKPK
DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTK
PREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPI
EKTISKAKGQPREPQVYTLPPSRDELTKNQVSLTCLVKGFYP
SDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSR
WQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 47 Ab CD73.10-IgG2-C219S
QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMHWVRQAPG full-length HC
KGLEWVAVIWYDESNKYYPDSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSSASTKG
PSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALT
SGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKP
SNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKPKDTLM
ISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKTKPREE
QFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKTI
SKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIA
VEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQG
NVFSCSVMHEALHNHYTQKSLSLSPG 48 Ab CD73.10-IgG2-
QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMHWVRQAPG C219S-IgG1.1 full-
KGLEWVAVIWYDESNKYYPDSVKGRFTISRDNSKNTLYLQMN length HC
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSSASTKG
PSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALT
SGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKP
SNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKPKDTLM
ISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPREE
QYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSSIEKTI
SKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIA
VEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQG
NVFSCSVMHEALHNHYTQKSLSLSPG 49 Ab CD73.10-IgG1.1 full-
QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMHWVRQAPG length HC
KGLEWVAVIWYDESNKYYPDSVKGRFTISRDNSKNTLYLQMN (IgG1.1-
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSSASTKG IgG1.1(L234A/L235E/
PSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALT G237A)-
SGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKP IgG1.1(A330S/P331S)-
SNTKVDKKVEPKSCDKTHTCPPCPAPEAEGAPSVFLFPPKPK IgG1.1)
DTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTK
PREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSSI
EKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYP
SDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSR
WQQGNVFSCSVMHEALHNHYTQKSLSLSPG 50 Ab CD73.4-IgG2-C219S
QVQLVESGGGVVQPGRSLRLSCAASGFTFSNYGMHWVRQAPG full-length HC
KGLEWVAVILYDGSNKYYPDSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSSWYPDSFDIWGQGTMVTVSSASTKG
PSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWNSGALT
SGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCNVDHKP
SNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKPKDTLM
ISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKTKPREE
QFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKTI
SKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDIA
VEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQG
NVFSCSVMHEALHNHYTQKSLSLSPG 51 Ab CD73.3-IgG1.1 full-
EVQLVESGGGLVQPGRSLRLSCAASGFTFDDYAMHWVRQAPG length HC
KGLEWVSGISWKSGSIGYADSVKGRFTISRDNAKNSLYLQMN (IgG1.1-
SLRAEDTVLYYCVKGYYVILTGLDYWGQGTLVTVSSASTKGP IgG1.1(L234A/L235E/
SVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWNSGALTS G237A)-
GVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICNVNHKPS IgG1.1(A330S/P331S)-
NTKVDKKVEPKSCDKTHTCPPCPAPEAEGAPSVFLFPPKPKD IgG.1)
TLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKP
REEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSSIE
KTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPS
DIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRW
QQGNVFSCSVMHEALHNHYTQKSLSLSPG 52 Full-length heavy chain
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN constant region IgG2-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG2-IgG2-IgG2
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 53 Full-length heavy chain
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN constant region IgG1-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1-IgG1-IgG1
VNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 54 Full-length heavy chain
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN constant region IgG1-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN IgG1.1(L234A/L235E/
VNHKPSNTKVDKKVEPKSCDKTHTCPPCPAPEAEGAPSVFLF G237A)-IgG1.1
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH (A3305/P3315)-IgG1
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPSSIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 55 Full-length heavy chain
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN constant region IgG2-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG2/IgG1 hybrid-IgG1-
VDHKPSNTKVDKTVERKCCVECPPCPAPELLGGPSVFLFPPK IgG1
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 56 Full-length heavy chain
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN constant region IgG2-
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN IgG2-
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP IgG1.1(A330/P331S)-
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT IgG1
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 57 Table 2-hinge domain VDKRV 58
Table 2-hinge domain VDKTV 59 Table 2-hinge domain EPKSCDKTHT 60
Table 2-hinge domain ERK 61 Table 2-hinge domain ELKTPLGDTTHT 62
Table 2-hinge domain EPKS 63 Table 2-hinge domain ESKYGPP 64 Table
2-hinge domain CPPCP 65 Table 2-hinge domain CCVECPPCP 66 Table
2-hinge domain CPRCP 67 Table 2-hinge domain EPKSCDTPPPCPRCP 68
Table 2-hinge domain CDTPPPCPRCP 69 Table 2-hinge domain CPSCP 70
Table 2-hinge domain APELLGG 71 Table 2-hinge domain APPVAG 72
Light chain 11F11 DIQMTQSPSSLSASVGDRVTITCRASQGISSWLAWYQQKPEK
APKSLIYAASSLQSGVPSRFSGSGSGTDFTLTISSLQPEDFA
TYYCQQYNSYPLTFGGGTKVEIKRTVAAPSVFIFPPSDEQLK
SGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDS
KDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFN RGEC 73 Light chain 4C3
EIVLTQSPGTLSLSPGERATLSCRASQSVSSYLAWYQQKPGQ
APRLLIYGASSRATGIPDRFSGSGSGTDFTLTISRLEPEDFA
VYYCQQYGSSPLTFGGGTKVEIKRTVAAPSVFIFPPSDEQLK
SGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDS
KDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFN RGEC 74 Light chain 6D11
EIVLTQSPGTLSLSPGERATLSCRASQSVSSSYLAWYQQKPG
QAPRLLIYGASSRATGIPDRFSGSGSGTDFTLTISRLEPEDF
AVYYCQHYGSSFTFGPGTKVDIKRTVAAPSVFIFPPSDEQLK
SGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDS
KDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFN RGEC 75 Anti-GITR Ab VH
QVQLVESGGGVVQPGRSLRLSCAASGFTFSSYGMHWVRQAPG
KGLEWVAVIWYEGSNKYYADSVKGRFTISRDNSKNTLYLQMN
SLRAEDTAVYYCARGGSMVRGDYYYGMDVWGQGTTVTVSS 76 Anti-GITR Ab VL
AIQLTQSPSSLSASVGDRVTITCRASQGISSALAWYQQKPGK
APKLLIYDASSLESGVPSRFSGSGSGTDFTLTISSLQPEDFA TYYCQQFNSYPYTFGQGTKLEIK
77 Anti-GITR Ab LC AIQLTQSPSSLSASVGDRVTITCRASQGISSALAWYQQKPGK
APKLLIYDASSLESGVPSRFSGSGSGTDFTLTISSLQPEDFA
TYYCQQFNSYPYTFGQGTKLEIKRTVAAPSVFIFPPSDEQLK
SGTASVVCLLNNFYPREAKVQWKVDNALQSGNSQESVTEQDS
KDSTYSLSSTLTLSKADYEKHKVYACEVTHQGLSSPVTKSFN RGEC 78 IgG1f
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 79 IgG2.3
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 80 IgG2.3 G1-AY
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 81 IgG2.3G1-KH
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 82 IgG2.5
ASTKGPSVFPLAPSSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 83 IgG1.1f
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPEAEGAPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPSSIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 84 IgG2.3G1.1f-KH
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 85 IgG1-deltaTHT
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKCPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 86 IgG2.3-plusTHT
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVETHTCPPCPAPPVAGPSVFLFP
PKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHN
AKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGL
PAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVK
GFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTV
DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 87 IgG2.3-plusGGG
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVEGGGCPPCPAPPVAGPSVFLFP
PKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHN
AKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGL
PAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVK
GFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTV
DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 88 IgG2.5G1.1f-KH
ASTKGPSVFPLAPSSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPSS
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 89 IgG2.5G1-AY
ASTKGPSVFPLAPSSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 90 IgG2.5G1-KH
ASTKGPSVFPLAPSSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 91 IgG2.5-plusTHT
ASTKGPSVFPLAPSSRSTSESTAALGCLVKDYFPEPVTVSWN
VSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQT
YTCNVDHKPSNTKVDKTVERKCCVETHTCPPCPAPPVAGPSV
FLFPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGV
EVHNAKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVS
NKGLPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLT
CLVKGFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYS
KLTVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 92 IgG1-G2.3G1-AY
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 93 IgG1-G2.3G1-KH
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 94 G2-G1-G1-G1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 95 G2.5-G1-G1-G1 ASTKGPSVFPLAP
SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 96 G1-G2.3-G2-G2
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
TVSWNSGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQ
TYICNVNHKPSNTKVDKRVEPKSCVECPPCPAPPVAGPSVFL
FPPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEV
HNAKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNK
GLPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCL
VKGFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKL
TVDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 97 G1-KRGEGSSNLF
ASTKGPSVFPLAP SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 98 G1-KRGEGS ASTKGPSVFPLAP
SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 99 G1-SNLF
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 100 IgG1-ITNDRTPR
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 101 G1-SNLFPR
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYICN
VNHKPSNTKVDKRVERKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVH
NAKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKA
LPAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 102 G2-RKEGSGNSFL
ASTKGPSVFPLAPCSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 103 G2-RKEGSG
ASTKGPSVFPLAPCSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 104 G2-NSFL
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 105 IgG2-TIDNTRRP
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYICN
VNHKPSNTKVDKRVEPKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 106 G2-NSFLRP
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYTCN
VDHKPSNTKVDKTVEPKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 107 G1-G1-G2-G1-AY
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVH
NAKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKG
LPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 108 G1-G1-G2-G1-KH
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPPVAGPSVFLFP
PKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHN
AKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGL
PAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVK
GFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTV
DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 109 G2-G2.3-G1-G2-KH
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 110 G2.5-G2.3-G1-G2-KH
ASTKGPSVFPLAP SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 111 G2-G2.3-G1-G2-AY
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 112 G2.5-G2.3-G1-G2-AY
ASTKGPSVFPLAP SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 113 G1-G2.3-G1-G1-KH
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKT
KPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAP
IEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 114 G2-G1-G2-G2-AY
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVH
NAKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKG
LPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 115 G2.5-G1-G2-G2-AY
ASTKGPSVFPLAP SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPELLGGPSVFLF
PPKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVH
NAKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKG
LPAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLV
KGFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLT
VDKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 116 G1-G2-G1-G1-AY
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 117 G2-G1-G2-G2-KH
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPPVAGPSVFLFP
PKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHN
AKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGL
PAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVK
GFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTV
DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 118 G2.5-G1-G2-G2-KH
ASTKGPSVFPLAP SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCDKTHTCPPCPAPPVAGPSVFLFP
PKPKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHN
AKTKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGL
PAPIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVK
GFYPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTV
DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 119 IgG1-deltaHinge
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKCPPCPAPELLGGPSVFLFPPKPKDT
LMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAKTKPR
EEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPAPIEK
TISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSD
IAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDKSRWQ
QGNVFSCSVMHEALHNHYTQKSLSLSPGK 120 IgG2-deltaHinge
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCPPCPAPPVAGPSVFLFPPKPKDTL
MISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKTKPRE
EQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKT
ISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDI
AVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQ
GNVFSCSVMHEALHNHYTQKSLSLSPGK 121 IgG2.5-deltaHinge ASTKGPSVFPLAP
SRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCPPCPAPPVAGPSVFLFPPKPKDTL
MISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKTKPRE
EQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAPIEKT
ISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFYPSDI
AVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKSRWQQ
GNVFSCSVMHEALHNHYTQKSLSLSPGK 122 IgG1-deltaG237
ASTKGPSVFPLAPSSKSTSGGTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSSLGTQTYICN
VNHKPSNTKVDKRVEPKSCDKTHTCPPCPAPELLGPSVFLFP
PKPKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHN
AKTKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKAL
PAPIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVK
GFYPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTV
DKSRWQQGNVFSCSVMHEALHNHYTQKSLSLSPG 123 IgG2-plusG237
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAG PSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAK
TKPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPA
PIEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 124 IgG2.4 ASTKGPSVFPLAPCSR
STSESTAALG CLVKDYFPEP VTVSWNSGAL TSGVHTFPAV LQSSGLYSLS SVVTVPSSNF
GTQTYTCNVD HKPSNTKVDK TVERKCSVEC PPCPAPPVAG PSVFLFPPKP KDTLMISRTP
EVTCVVVDVS HEDPEVQFNW YVDGVEVHNA KTKPREEQFN STFRVVSVLT VVHQDWLNGK
EYKCKVSNKG LPAPIEKTIS KTKGQPREPQ VYTLPPSREE MTKNQVSLTC LVKGFYPSDI
AVEWESNGQP ENNYKTTPPM LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT
QKSLSLSPGK 125 IgG2.3/4 ASTKGP SVFPLAPCSR STSESTAALG CLVKDYFPEP
VTVSWNSGAL TSGVHTFPAV LQSSGLYSLS SVVTVPSSNF GTQTYTCNVD HKPSNTKVDK
TVERKSSVEC PPCPAPPVAG PSVFLFPPKP KDTLMISRTP EVTCVVVDVS HEDPEVQFNW
YVDGVEVHNA KTKPREEQFN STFRVVSVLT VVHQDWLNGK EYKCKVSNKG LPAPIEKTIS
KTKGQPREPQ VYTLPPSREE MTKNQVSLTC LVKGFYPSDI AVEWESNGQP ENNYKTTPPM
LDSDGSFFLY SKLTVDKSRW QQGNVFSCSV MHEALHNHYT QKSLSLSPGK 126 Hinge
IgG2 C220S ERKCSVECPPCPAPPVAG 127 IgG2/IgG1 hybrid hinge
ERKCSVECPPCPAPELLGG C220S 128 Wildtype IgG2 hinge ERKCCVECPPCPAP
portion 129 IgG2 hinge portion C219S ERKSCVECPPCPAP 130 IgG2 hinge
portion C220S ERKCSVECPPCPAP 131 IgG2 hinge portion ERKXCVECPPCPAP
C219X 132 IgG2 hinge portion ERKCXVECPPCPAP C220X 133 IgG2 CH1 +
IgG2 hinge ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN (wildtype)
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKCCVECPPCPAPPVAG 134 IgG2 with C219X
ERKXCVECPPCPAPPVAG 135 IgG2 with C220X ERKCXVECPPCPAPPVAG 136
IgG2/IgG1 hybrid with ERKXCVECPPCPAPELLGG C219X 137 IgG2/IgG1
hybrid with ERKCVECPPCPAPELLGG C220X 138 IgG2/IgG1 hybrid deltaG
ERKCCVECPPCPAPELLG 139 IgG2/IgG1 hybrid with ERKSCVECPPCPAPELLG
C219S deltaG 140 IgG2/IgG1 hybrid with ERKCSVECPPCPAPELLG C220S
deltaG 141 IgG2/IgG1 hybrid with ERKXCVECPPCPAPELLG C219X deltaG
142 IgG2/IgG1 hybrid with ERKCXVECPPCPAPELLG C220X deltaG 143
Wildtype IgG2 with C- ERKCCVECPPCPAPPVAGX terminal X 144 IgG2 with
C219Swith C- ERKSCVECPPCPAPPVAGX terminal X 145 IgG2 with C220Swith
C- ERKCSVECPPCPAPPVAGX terminal X 146 IgG2 with C219X with C-
ERKXCVECPPCPAPPVAGX terminal X 147 IgG2 with C220X with C-
ERKCXVECPPCPAPPVAGX terminal X 148 IgG2 hinge portion PVAG 149 IgG1
hinge portion SCDKTHT 150 IgG1 hinge portion 1 ELLG 151 IgG1 hinge
portion 2 ELLGG 152 IgG2.3-V13
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGDSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 153 IgG2.3-V14
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGDSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDGEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 154 IgG2.3-V15
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGDSVFLFPPKP
KDTLMISRTPEVTCVVVDVSDEDGEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 155 IgG2.3-V16
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGDSVFLFPPKP
KDTLMISRTPEVTCVVVDVSHEDGEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPRP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 156 IgG2.3-V17
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGDSVFLFPPKP
KDTLMISRTPEVTCVVVDVSDEDGEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPRP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK
157 IgG2.3-V18 ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVEHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGLPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 158 IgG2.3-V19
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPPVAGPSVFLFPPKP
KDTLMISRTPEVTCVVVDVEHEDPEVQFNWYVDGVEVHNAKT
KPREEQFNSTFRVVSVLTVVHQDWLNGKEYKCKVSNKGFPAP
IEKTISKTKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGFY
PSDIAVEWESNGQPENNYKTTPPMLDSDGSFFLYSKLTVDKS
RWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 159 IgG2.3G1
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 160 IgG2.3G1-V20
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 161 IgG2.3G1-V21
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDGEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 162 IgG2.3G1-V22
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSDEDGEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 163 IgG2.3G1-V23
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSHEDGEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPR
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 164 IgG2.3G1-V24
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSDEDGEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPR
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 165 IgG2.3G1-V25
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGDDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSDEDGEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPR
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 166 IgG2.3G1-V26
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPDLLGDDSVFLFPPK
PKDTLMISRTPEVTCVVVDVSDEDGEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPR
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 167 IgG2.3G1-V27
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVEHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKALPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK 168 IgG2.3G1-V28
ASTKGPSVFPLAPCSRSTSESTAALGCLVKDYFPEPVTVSWN
SGALTSGVHTFPAVLQSSGLYSLSSVVTVPSSNFGTQTYTCN
VDHKPSNTKVDKTVERKSCVECPPCPAPELLGGPSVFLFPPK
PKDTLMISRTPEVTCVVVDVEHEDPEVKFNWYVDGVEVHNAK
TKPREEQYNSTYRVVSVLTVLHQDWLNGKEYKCKVSNKAFPA
PIEKTISKAKGQPREPQVYTLPPSREEMTKNQVSLTCLVKGF
YPSDIAVEWESNGQPENNYKTTPPVLDSDGSFFLYSKLTVDK
SRWQQGNVFSCSVMHEALHNHYTQKSLSLSPGK
[0409] Those skilled in the art will recognize or be able to
ascertain, using no more than routine experimentation, many
equivalents of the specific embodiments described herein described
herein. Such equivalents are intended to be encompassed by the
following claims.
Sequence CWU 1
1
1701330PRTHomo sapiensmisc_feature(1)..(330)Full length IgG1 wild
type 1Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser
Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys
Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala
Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser
Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser
Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro
Ser Asn Thr Lys Val Asp Lys 85 90 95Lys Val Glu Pro Lys Ser Cys Asp
Lys Thr His Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu
Gly Gly Pro Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp
Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val
Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155
160Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu
165 170 175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr
Val Leu 180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys
Lys Val Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr
Ile Ser Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr
Thr Leu Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln
Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp
Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn
Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280
285Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn
290 295 300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His
Tyr Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
330298PRTHomo sapiensmisc_feature(1)..(98)CH1 IgG1 wild type 2Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10
15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly
Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Lys Val322PRTHomo
sapiensmisc_feature(1)..(22)Hinge IgG1 wild type 3Glu Pro Lys Ser
Cys Asp Lys Thr His Thr Cys Pro Pro Cys Pro Ala1 5 10 15Pro Glu Leu
Leu Gly Gly 204103PRTHomo sapiensmisc_feature(1)..(103)CH2 IgG1
wild type 4Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu
Met Ile1 5 10 15Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val
Ser His Glu 20 25 30Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly
Val Glu Val His 35 40 45Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr
Asn Ser Thr Tyr Arg 50 55 60Val Val Ser Val Leu Thr Val Leu His Gln
Asp Trp Leu Asn Gly Lys65 70 75 80Glu Tyr Lys Cys Lys Val Ser Asn
Lys Ala Leu Pro Ala Pro Ile Glu 85 90 95Lys Thr Ile Ser Lys Ala Lys
1005107PRTHomo sapiensmisc_feature(1)..(107)CH3 IgG1 wild type 5Gly
Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu1 5 10
15Glu Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
20 25 30Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu 35 40 45Asn Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly
Ser Phe 50 55 60Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly65 70 75 80Asn Val Phe Ser Cys Ser Val Met His Glu Ala
Leu His Asn His Tyr 85 90 95Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly
Lys 100 1056326PRTHomo sapiensmisc_feature(1)..(326)Full length
IgG2 wild type 6Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro
Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu
Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser
Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln
Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser
Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His
Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Cys
Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly
Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu
Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135
140Val Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp
Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu
Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser Val Leu Thr
Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys
Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr
Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr
Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235 240Gln
Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250
255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr
260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr
Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn
Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His Asn His
Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly Lys
325798PRTHomo sapiensmisc_feature(1)..(98)CH1 IgG2 wild type 7Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val818PRTHomo
sapiensmisc_feature(1)..(18)Hinge IgG2 wild type 8Glu Arg Lys Cys
Cys Val Glu Cys Pro Pro Cys Pro Ala Pro Pro Val1 5 10 15Ala
Gly9103PRTHomo sapiensmisc_feature(1)..(103)CH2 IgG2 wild type 9Pro
Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile1 5 10
15Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser His Glu
20 25 30Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly Val Glu Val
His 35 40 45Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn Ser Thr
Phe Arg 50 55 60Val Val Ser Val Leu Thr Val Val His Gln Asp Trp Leu
Asn Gly Lys65 70 75 80Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu
Pro Ala Pro Ile Glu 85 90 95Lys Thr Ile Ser Lys Thr Lys
10010107PRTHomo sapiensmisc_feature(1)..(107)CH3 IgG2 wild type
10Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu1
5 10 15Glu Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly
Phe 20 25 30Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu 35 40 45Asn Asn Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser Asp
Gly Ser Phe 50 55 60Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg
Trp Gln Gln Gly65 70 75 80Asn Val Phe Ser Cys Ser Val Met His Glu
Ala Leu His Asn His Tyr 85 90 95Thr Gln Lys Ser Leu Ser Leu Ser Pro
Gly Lys 100 10511377PRTHomo sapiensmisc_feature(1)..(377)Full
length IgG3 wild type 11Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu
Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly
Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp
Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val
Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val
Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val
Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Arg Val Glu Leu
Lys Thr Pro Leu Gly Asp Thr Thr His Thr Cys Pro 100 105 110Arg Cys
Pro Glu Pro Lys Ser Cys Asp Thr Pro Pro Pro Cys Pro Arg 115 120
125Cys Pro Glu Pro Lys Ser Cys Asp Thr Pro Pro Pro Cys Pro Arg Cys
130 135 140Pro Glu Pro Lys Ser Cys Asp Thr Pro Pro Pro Cys Pro Arg
Cys Pro145 150 155 160Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys 165 170 175Pro Lys Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val 180 185 190Val Val Asp Val Ser His Glu
Asp Pro Glu Val Gln Phe Lys Trp Tyr 195 200 205Val Asp Gly Val Glu
Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu 210 215 220Gln Tyr Asn
Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Leu His225 230 235
240Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
245 250 255Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys
Gly Gln 260 265 270Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met 275 280 285Thr Lys Asn Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro 290 295 300Ser Asp Ile Ala Val Glu Trp Glu
Ser Ser Gly Gln Pro Glu Asn Asn305 310 315 320Tyr Asn Thr Thr Pro
Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu 325 330 335Tyr Ser Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Ile 340 345 350Phe
Ser Cys Ser Val Met His Glu Ala Leu His Asn Arg Phe Thr Gln 355 360
365Lys Ser Leu Ser Leu Ser Pro Gly Lys 370 3751298PRTHomo
sapiensmisc_feature(1)..(98)CH1 IgG3 wild type 12Ala Ser Thr Lys
Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser
Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro
Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly
Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55
60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65
70 75 80Tyr Thr Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp
Lys 85 90 95Arg Val1318PRTHomo sapiensmisc_feature(1)..(18)Hinge
IgG3 wild type 13Glu Leu Lys Thr Pro Leu Gly Asp Thr Thr His Thr
Cys Pro Arg Cys1 5 10 15Pro Glu14154PRTHomo
sapiensmisc_feature(1)..(154)CH2 IgG3 wild type 14Pro Lys Ser Cys
Asp Thr Pro Pro Pro Cys Pro Arg Cys Pro Glu Pro1 5 10 15Lys Ser Cys
Asp Thr Pro Pro Pro Cys Pro Arg Cys Pro Glu Pro Lys 20 25 30Ser Cys
Asp Thr Pro Pro Pro Cys Pro Arg Cys Pro Ala Pro Glu Leu 35 40 45Leu
Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr 50 55
60Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val65
70 75 80Ser His Glu Asp Pro Glu Val Gln Phe Lys Trp Tyr Val Asp Gly
Val 85 90 95Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr
Asn Ser 100 105 110Thr Phe Arg Val Val Ser Val Leu Thr Val Leu His
Gln Asp Trp Leu 115 120 125Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys Ala Leu Pro Ala 130 135 140Pro Ile Glu Lys Thr Ile Ser Lys
Thr Lys145 15015107PRTHomo sapiensmisc_feature(1)..(107)CH3 IgG3
wild type 15Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu1 5 10 15Glu Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val
Lys Gly Phe 20 25 30Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Ser
Gly Gln Pro Glu 35 40 45Asn Asn Tyr Asn Thr Thr Pro Pro Met Leu Asp
Ser Asp Gly Ser Phe 50 55 60Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly65 70 75 80Asn Ile Phe Ser Cys Ser Val Met
His Glu Ala Leu His Asn Arg Phe 85 90 95Thr Gln Lys Ser Leu Ser Leu
Ser Pro Gly Lys 100 10516327PRTHomo
sapiensmisc_feature(1)..(327)Full length IgG4 wild type 16Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Lys Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Ser Lys Tyr Gly Pro Pro Cys Pro
Ser Cys Pro Ala Pro 100 105 110Glu Phe Leu Gly Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser Gln Glu
Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Gly Leu 195 200 205Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Gln Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260
265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr
Ser 275 280 285Arg Leu Thr Val Asp Lys Ser Arg Trp Gln Glu Gly Asn
Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala Leu His Asn His
Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser Leu Gly Lys
3251798PRTHomo sapiensmisc_feature(1)..(98)CH1 IgG4 wild type 17Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly
Thr Lys Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Arg Val1819PRTHomo
sapiensmisc_feature(1)..(19)Hinge IgG4 wild type 18Glu Ser Lys Tyr
Gly Pro Pro Cys Pro Ser Cys Pro Ala Pro Glu Phe1 5 10 15Leu Gly
Gly19103PRTHomo sapiensmisc_feature(1)..(103)CH2 IgG4 wild type
19Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile1
5 10 15Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser Gln
Glu 20 25 30Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly Val Glu
Val His 35 40 45Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn Ser
Thr Tyr Arg 50 55 60Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp
Leu Asn Gly Lys65 70 75 80Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly
Leu Pro Ser Ser Ile Glu 85 90 95Lys Thr Ile Ser Lys Ala Lys
10020107PRTHomo sapiensmisc_feature(1)..(107)CH3 IgG4 wild type
20Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Gln Glu1
5 10 15Glu Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly
Phe 20 25 30Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu 35 40 45Asn Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp
Gly Ser Phe 50 55 60Phe Leu Tyr Ser Arg Leu Thr Val Asp Lys Ser Arg
Trp Gln Glu Gly65 70 75 80Asn Val Phe Ser Cys Ser Val Met His Glu
Ala Leu His Asn His Tyr 85 90 95Thr Gln Lys Ser Leu Ser Leu Ser Leu
Gly Lys 100 1052118PRTArtificial SequenceSynthetic Modified IgG2
Hinge (C219S) 21Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala
Pro Pro Val1 5 10 15Ala Gly2219PRTArtificial SequenceSynthetic
IgG2/IgG1 hybrid hinge 22Glu Arg Lys Cys Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro Glu Leu1 5 10 15Leu Gly Gly2319PRTArtificial
SequenceSynthetic IgG2 C219S/IgG1 hybrid hinge 23Glu Arg Lys Ser
Cys Val Glu Cys Pro Pro Cys Pro Ala Pro Glu Leu1 5 10 15Leu Gly
Gly24103PRTArtificial SequenceSynthetic Modified CH2 IgG1
(A330S/P331S) 24Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr
Leu Met Ile1 5 10 15Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
Val Ser His Glu 20 25 30Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp
Gly Val Glu Val His 35 40 45Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln
Tyr Asn Ser Thr Tyr Arg 50 55 60Val Val Ser Val Leu Thr Val Leu His
Gln Asp Trp Leu Asn Gly Lys65 70 75 80Glu Tyr Lys Cys Lys Val Ser
Asn Lys Ala Leu Pro Ser Ser Ile Glu 85 90 95Lys Thr Ile Ser Lys Ala
Lys 1002522PRTArtificial SequenceSynthetic IgG1.1 Hinge
(L234A/L235E/G237A) 25Glu Pro Lys Ser Cys Asp Lys Thr His Thr Cys
Pro Pro Cys Pro Ala1 5 10 15Pro Glu Ala Glu Gly Ala
2026326PRTArtificial SequenceSynthetic IgG1 IgG2 IgG1 (IgG1
IgG2/IgG1(SEQ#22) IgG1 IgG1) 26Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys
Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Lys Val
Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys
115 120 125Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val
Val Val 130 135 140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn
Trp Tyr Val Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr
Lys Pro Arg Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val
Ser Val Leu Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys
Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro
Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu
Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230
235 240Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser
Asp 245 250 255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
Asn Tyr Lys 260 265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser
Phe Phe Leu Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala
Leu His Asn His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser
Pro Gly 32527325PRTArtificial SequenceSynthetic IgG1 IgG2 IgG12
(IgG1 IgG2(SEQ#8) IgG1 IgG1) 27Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys
Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Lys Val
Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val
Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp
Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys
Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser
Val Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu
Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala Pro Ile
Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230
235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp
Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn
Tyr Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe
Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln
Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu
His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro
Gly 32528326PRTArtificial SequenceSynthetic IgG2 IgG1 (IgG2
IgG2/IgG1(SEQ#22) IgG1 IgG1) 28Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys
115 120 125Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val
Val Val 130 135 140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn
Trp Tyr Val Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr
Lys Pro Arg Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val
Ser Val Leu Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys
Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro
Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu
Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230
235 240Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser
Asp 245 250 255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
Asn Tyr Lys 260 265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser
Phe Phe Leu Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala
Leu His Asn His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser
Pro Gly 32529325PRTArtificial SequenceSynthetic IgG2 IgG12 (IgG2
IgG2(SEQ#8) IgG1 IgG1) 29Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn
Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu
Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro
Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
32530325PRTArtificial SequenceSynthetic IgG1 IgG2 IgG1.1 (IgG1
IgG2(SEQ#8) IgG1(A330S/P331S) IgG1) 30Ala Ser Thr Lys Gly Pro Ser
Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr
Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr
Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser
Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr
Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90
95Lys Val Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro
100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro
Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys
Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe
Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys
Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val
Val Ser Val Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly
Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ser
Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215
220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys
Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr
Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp
Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser
Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His
Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser
Leu Ser Pro Gly 32531326PRTArtificial SequenceSynthetic IgG2 IgG1.1
(IgG2 IgG2(SEQ#8) IgG1(A330S/P331S) IgG1) 31Ala Ser Thr Lys Gly Pro
Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser
Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro
Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His
Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser
Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75
80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys
85 90 95Thr Val Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala
Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys
Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ser Ser Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
Lys 32532325PRTArtificial SequenceSynthetic IgG1 IgG2CS IgG1 (IgG1
IgG2(C219S) IgG1 IgG1) 32Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn
Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Lys Val Glu
Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro
Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
32533325PRTArtificial SequenceSynthetic IgG1 IgG2CS IgG12 (IgG1
IgG2(C219S) IgG1 IgG1) 33Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn
Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Lys Val Glu
Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro
Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
32534326PRTArtificial SequenceSynthetic IgG2CS IgG1 (IgG2
IgG2(C219S) IgG1 IgG1) 34Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn
Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu
Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Glu
Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115
120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val
Asp130 135 140 145Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp
Tyr Val Asp Gly150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro
Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val
Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr
Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala Pro Ile Glu
Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu210 215 220 225Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys290 295 300 305Ser Val Met His Glu Ala Leu
His Asn His Tyr Thr Gln Lys Ser Leu310 315 320Ser Leu Ser Pro Gly
32535325PRTArtificial SequenceSynthetic IgG2CS IgG12 (IgG2
IgG2(C219S) IgG1 IgG1) 35Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn
Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu
Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro
Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
32536325PRTArtificial SequenceSynthetic IgG1 IgG2CS IgG1.1 (IgG1
IgG2(C219S) IgG1(A330S/P331S) IgG1) 36Ala Ser Thr Lys Gly Pro Ser
Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr
Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr
Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser
Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr
Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90
95Lys Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro
100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro
Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys
Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe
Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys
Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val
Val Ser Val Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly
Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ser
Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215
220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys
Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr
Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp
Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser
Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His
Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser
Leu Ser Pro Gly 32537325PRTArtificial SequenceSynthetic IgG2CS
IgG1.1 (IgG2 IgG2(C219S) IgG1(A330S/P331S) IgG1) 37Ala Ser Thr Lys
Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser
Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro
Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly
Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55
60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65
70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp
Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro
Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val
Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr
Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200
205Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu
210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr
Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser
Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315
320Ser Leu Ser Pro Gly 32538121PRTArtificial SequenceSynthetic Ab
11F11 VH 38Gln Val Gln Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro
Gly Arg1 5 10 15Ser Leu Arg Leu Ser Cys Ala Thr Ser Gly Phe Thr Phe
Ser Asn Tyr 20 25 30Gly Met His Trp Val Arg Gln Ala Pro Gly Lys Gly
Leu Glu Trp Val 35 40 45Ala Val Ile Leu Tyr Asp Gly Ser Asn Lys Tyr
Tyr Pro Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn
Ser Lys Asn Thr Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala
Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Ser Trp
Tyr Pro Asp Ser Phe Asp Ile Trp Gly 100 105 110Gln Gly Thr Met Val
Thr Val Ser Ser 115 12039120PRTArtificial SequenceSynthetic Ab 4C3
VH 39Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly
Arg1 5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Asp
Asp Tyr 20 25 30Ala Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu
Glu Trp Val 35 40 45Ser Gly Ile Ser Trp Lys Ser Gly Ser Ile Gly Tyr
Ala Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala
Lys Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu
Asp Thr Ala Leu Tyr Tyr Cys 85 90 95Val Lys Gly Tyr Tyr Val Ile Leu
Thr Gly Leu Asp Tyr Trp Gly Gln 100 105 110Gly Thr Leu Val Thr Val
Ser Ser 115
12040121PRTArtificial SequenceSynthetic Ab CD73.10 VH 40Gln Val Gln
Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro Gly Arg1 5 10 15Ser Leu
Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly
Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40
45Ala Val Ile Trp Tyr Asp Glu Ser Asn Lys Tyr Tyr Pro Asp Ser Val
50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys Asn Thr Leu
Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val
Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Ser Trp Tyr Pro Asp Ser Phe
Asp Ile Trp Gly 100 105 110Gln Gly Thr Met Val Thr Val Ser Ser 115
12041120PRTArtificial SequenceSynthetic Ab CD73.3 VH (4C3 / V94A)
41Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Arg1
5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Asp Asp
Tyr 20 25 30Ala Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu
Trp Val 35 40 45Ser Gly Ile Ser Trp Lys Ser Gly Ser Ile Gly Tyr Ala
Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys
Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp
Thr Val Leu Tyr Tyr Cys 85 90 95Val Lys Gly Tyr Tyr Val Ile Leu Thr
Gly Leu Asp Tyr Trp Gly Gln 100 105 110Gly Thr Leu Val Thr Val Ser
Ser 115 12042121PRTArtificial SequenceSynthetic Ab 6E11 VH 42Glu
Val Gln Leu Val Glu Ser Gly Gly Ala Leu Val Gln Pro Gly Arg1 5 10
15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Asp Asp Tyr
20 25 30Ala Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp
Val 35 40 45Ser Gly Ile Thr Trp Asn Ser Gly Gly Ile Gly Tyr Ala Asp
Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn
Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr
Ala Leu Tyr Tyr Cys 85 90 95Ala Lys Asp Arg Tyr Tyr Ser Ser Trp Leu
Leu Phe Asp Asn Trp Gly 100 105 110Gln Gly Ile Leu Val Thr Val Ser
Ser 115 12043121PRTArtificial SequenceSynthetic Ab CD73.4 VH 43Gln
Val Gln Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro Gly Arg1 5 10
15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr
20 25 30Gly Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp
Val 35 40 45Ala Val Ile Leu Tyr Asp Gly Ser Asn Lys Tyr Tyr Pro Asp
Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys Asn
Thr Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr
Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Ser Trp Tyr Pro Asp
Ser Phe Asp Ile Trp Gly 100 105 110Gln Gly Thr Met Val Thr Val Ser
Ser 115 12044447PRTArtificial SequenceSynthetic Ab 11F11 full
length HC 44Gln Val Gln Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro
Gly Arg1 5 10 15Ser Leu Arg Leu Ser Cys Ala Thr Ser Gly Phe Thr Phe
Ser Asn Tyr 20 25 30Gly Met His Trp Val Arg Gln Ala Pro Gly Lys Gly
Leu Glu Trp Val 35 40 45Ala Val Ile Leu Tyr Asp Gly Ser Asn Lys Tyr
Tyr Pro Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn
Ser Lys Asn Thr Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala
Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Ser Trp
Tyr Pro Asp Ser Phe Asp Ile Trp Gly 100 105 110Gln Gly Thr Met Val
Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser 115 120 125Val Phe Pro
Leu Ala Pro Cys Ser Arg Ser Thr Ser Glu Ser Thr Ala 130 135 140Ala
Leu Gly Cys Leu Val Lys Asp Tyr Phe Pro Glu Pro Val Thr Val145 150
155 160Ser Trp Asn Ser Gly Ala Leu Thr Ser Gly Val His Thr Phe Pro
Ala 165 170 175Val Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val
Val Thr Val 180 185 190Pro Ser Ser Asn Phe Gly Thr Gln Thr Tyr Thr
Cys Asn Val Asp His 195 200 205Lys Pro Ser Asn Thr Lys Val Asp Lys
Thr Val Glu Arg Lys Cys Cys 210 215 220Val Glu Cys Pro Pro Cys Pro
Ala Pro Pro Val Ala Gly Pro Ser Val225 230 235 240Phe Leu Phe Pro
Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr 245 250 255Pro Glu
Val Thr Cys Val Val Val Asp Val Ser His Glu Asp Pro Glu 260 265
270Val Gln Phe Asn Trp Tyr Val Asp Gly Val Glu Val His Asn Ala Lys
275 280 285Thr Lys Pro Arg Glu Glu Gln Phe Asn Ser Thr Phe Arg Val
Val Ser 290 295 300Val Leu Thr Val Val His Gln Asp Trp Leu Asn Gly
Lys Glu Tyr Lys305 310 315 320Cys Lys Val Ser Asn Lys Gly Leu Pro
Ala Pro Ile Glu Lys Thr Ile 325 330 335Ser Lys Thr Lys Gly Gln Pro
Arg Glu Pro Gln Val Tyr Thr Leu Pro 340 345 350Pro Ser Arg Glu Glu
Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu 355 360 365Val Lys Gly
Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn 370 375 380Gly
Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser385 390
395 400Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser
Arg 405 410 415Trp Gln Gln Gly Asn Val Phe Ser Cys Ser Val Met His
Glu Ala Leu 420 425 430His Asn His Tyr Thr Gln Lys Ser Leu Ser Leu
Ser Pro Gly Lys 435 440 44545450PRTArtificial SequenceSynthetic Ab
4C3 full length HC 45Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu
Val Gln Pro Gly Arg1 5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly
Phe Thr Phe Asp Asp Tyr 20 25 30Ala Met His Trp Val Arg Gln Ala Pro
Gly Lys Gly Leu Glu Trp Val 35 40 45Ser Gly Ile Ser Trp Lys Ser Gly
Ser Ile Gly Tyr Ala Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser
Arg Asp Asn Ala Lys Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser
Leu Arg Ala Glu Asp Thr Ala Leu Tyr Tyr Cys 85 90 95Val Lys Gly Tyr
Tyr Val Ile Leu Thr Gly Leu Asp Tyr Trp Gly Gln 100 105 110Gly Thr
Leu Val Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser Val 115 120
125Phe Pro Leu Ala Pro Ser Ser Lys Ser Thr Ser Gly Gly Thr Ala Ala
130 135 140Leu Gly Cys Leu Val Lys Asp Tyr Phe Pro Glu Pro Val Thr
Val Ser145 150 155 160Trp Asn Ser Gly Ala Leu Thr Ser Gly Val His
Thr Phe Pro Ala Val 165 170 175Leu Gln Ser Ser Gly Leu Tyr Ser Leu
Ser Ser Val Val Thr Val Pro 180 185 190Ser Ser Ser Leu Gly Thr Gln
Thr Tyr Ile Cys Asn Val Asn His Lys 195 200 205Pro Ser Asn Thr Lys
Val Asp Lys Lys Val Glu Pro Lys Ser Cys Asp 210 215 220Lys Thr His
Thr Cys Pro Pro Cys Pro Ala Pro Glu Leu Leu Gly Gly225 230 235
240Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile
245 250 255Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser
His Glu 260 265 270Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly
Val Glu Val His 275 280 285Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln
Tyr Asn Ser Thr Tyr Arg 290 295 300Val Val Ser Val Leu Thr Val Leu
His Gln Asp Trp Leu Asn Gly Lys305 310 315 320Glu Tyr Lys Cys Lys
Val Ser Asn Lys Ala Leu Pro Ala Pro Ile Glu 325 330 335Lys Thr Ile
Ser Lys Ala Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr 340 345 350Thr
Leu Pro Pro Ser Arg Asp Glu Leu Thr Lys Asn Gln Val Ser Leu 355 360
365Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp
370 375 380Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro
Pro Val385 390 395 400Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser
Lys Leu Thr Val Asp 405 410 415Lys Ser Arg Trp Gln Gln Gly Asn Val
Phe Ser Cys Ser Val Met His 420 425 430Glu Ala Leu His Asn His Tyr
Thr Gln Lys Ser Leu Ser Leu Ser Pro 435 440 445Gly Lys
45046451PRTArtificial SequenceSynthetic Ab 6E11 full length HC
46Glu Val Gln Leu Val Glu Ser Gly Gly Ala Leu Val Gln Pro Gly Arg1
5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Asp Asp
Tyr 20 25 30Ala Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu
Trp Val 35 40 45Ser Gly Ile Thr Trp Asn Ser Gly Gly Ile Gly Tyr Ala
Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys
Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp
Thr Ala Leu Tyr Tyr Cys 85 90 95Ala Lys Asp Arg Tyr Tyr Ser Ser Trp
Leu Leu Phe Asp Asn Trp Gly 100 105 110Gln Gly Ile Leu Val Thr Val
Ser Ser Ala Ser Thr Lys Gly Pro Ser 115 120 125Val Phe Pro Leu Ala
Pro Ser Ser Lys Ser Thr Ser Gly Gly Thr Ala 130 135 140Ala Leu Gly
Cys Leu Val Lys Asp Tyr Phe Pro Glu Pro Val Thr Val145 150 155
160Ser Trp Asn Ser Gly Ala Leu Thr Ser Gly Val His Thr Phe Pro Ala
165 170 175Val Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val Val
Thr Val 180 185 190Pro Ser Ser Ser Leu Gly Thr Gln Thr Tyr Ile Cys
Asn Val Asn His 195 200 205Lys Pro Ser Asn Thr Lys Val Asp Lys Lys
Val Glu Pro Lys Ser Cys 210 215 220Asp Lys Thr His Thr Cys Pro Pro
Cys Pro Ala Pro Glu Leu Leu Gly225 230 235 240Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met 245 250 255Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser His 260 265 270Glu
Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly Val Glu Val 275 280
285His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser Thr Tyr
290 295 300Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp Leu
Asn Gly305 310 315 320Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala
Leu Pro Ala Pro Ile 325 330 335Glu Lys Thr Ile Ser Lys Ala Lys Gly
Gln Pro Arg Glu Pro Gln Val 340 345 350Tyr Thr Leu Pro Pro Ser Arg
Asp Glu Leu Thr Lys Asn Gln Val Ser 355 360 365Leu Thr Cys Leu Val
Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val Glu 370 375 380Trp Glu Ser
Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro385 390 395
400Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val
405 410 415Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys Ser
Val Met 420 425 430His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu Ser Leu Ser 435 440 445Pro Gly Lys 45047446PRTArtificial
SequenceSynthetic Ab CD73.10 IgG2 C219S full length HC 47Gln Val
Gln Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro Gly Arg1 5 10 15Ser
Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25
30Gly Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val
35 40 45Ala Val Ile Trp Tyr Asp Glu Ser Asn Lys Tyr Tyr Pro Asp Ser
Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys Asn Thr
Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala
Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Ser Trp Tyr Pro Asp Ser
Phe Asp Ile Trp Gly 100 105 110Gln Gly Thr Met Val Thr Val Ser Ser
Ala Ser Thr Lys Gly Pro Ser 115 120 125Val Phe Pro Leu Ala Pro Cys
Ser Arg Ser Thr Ser Glu Ser Thr Ala 130 135 140Ala Leu Gly Cys Leu
Val Lys Asp Tyr Phe Pro Glu Pro Val Thr Val145 150 155 160Ser Trp
Asn Ser Gly Ala Leu Thr Ser Gly Val His Thr Phe Pro Ala 165 170
175Val Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val Val Thr Val
180 185 190Pro Ser Ser Asn Phe Gly Thr Gln Thr Tyr Thr Cys Asn Val
Asp His 195 200 205Lys Pro Ser Asn Thr Lys Val Asp Lys Thr Val Glu
Arg Lys Ser Cys 210 215 220Val Glu Cys Pro Pro Cys Pro Ala Pro Pro
Val Ala Gly Pro Ser Val225 230 235 240Phe Leu Phe Pro Pro Lys Pro
Lys Asp Thr Leu Met Ile Ser Arg Thr 245 250 255Pro Glu Val Thr Cys
Val Val Val Asp Val Ser His Glu Asp Pro Glu 260 265 270Val Gln Phe
Asn Trp Tyr Val Asp Gly Val Glu Val His Asn Ala Lys 275 280 285Thr
Lys Pro Arg Glu Glu Gln Phe Asn Ser Thr Phe Arg Val Val Ser 290 295
300Val Leu Thr Val Val His Gln Asp Trp Leu Asn Gly Lys Glu Tyr
Lys305 310 315 320Cys Lys Val Ser Asn Lys Gly Leu Pro Ala Pro Ile
Glu Lys Thr Ile 325 330 335Ser Lys Thr Lys Gly Gln Pro Arg Glu Pro
Gln Val Tyr Thr Leu Pro 340 345 350Pro Ser Arg Glu Glu Met Thr Lys
Asn Gln Val Ser Leu Thr Cys Leu 355 360 365Val Lys Gly Phe Tyr Pro
Ser Asp Ile Ala Val Glu Trp Glu Ser Asn 370 375 380Gly Gln Pro Glu
Asn Asn Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser385 390 395 400Asp
Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg 405 410
415Trp Gln Gln Gly Asn Val Phe Ser Cys Ser Val Met His Glu Ala Leu
420 425 430His Asn His Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly
435 440 44548446PRTArtificial SequenceSynthetic Ab CD73.10 IgG2
C219S IgG1.1 full length HC 48Gln Val Gln Leu Val Glu Ser Gly Gly
Gly Val Val Gln Pro Gly Arg1 5 10 15Ser Leu Arg Leu Ser Cys Ala Ala
Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met His Trp Val Arg Gln
Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Val Ile Trp Tyr Asp
Glu Ser Asn Lys Tyr Tyr Pro Asp Ser Val 50 55 60Lys Gly Arg Phe Thr
Ile Ser Arg Asp Asn Ser Lys Asn Thr Leu Tyr65 70 75 80Leu Gln Met
Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg
Gly Gly Ser Ser Trp Tyr Pro Asp Ser Phe Asp Ile Trp Gly 100 105
110Gln Gly Thr Met Val Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser
115 120
125Val Phe Pro Leu Ala Pro Cys Ser Arg Ser Thr Ser Glu Ser Thr Ala
130 135 140Ala Leu Gly Cys Leu Val Lys Asp Tyr Phe Pro Glu Pro Val
Thr Val145 150 155 160Ser Trp Asn Ser Gly Ala Leu Thr Ser Gly Val
His Thr Phe Pro Ala 165 170 175Val Leu Gln Ser Ser Gly Leu Tyr Ser
Leu Ser Ser Val Val Thr Val 180 185 190Pro Ser Ser Asn Phe Gly Thr
Gln Thr Tyr Thr Cys Asn Val Asp His 195 200 205Lys Pro Ser Asn Thr
Lys Val Asp Lys Thr Val Glu Arg Lys Ser Cys 210 215 220Val Glu Cys
Pro Pro Cys Pro Ala Pro Pro Val Ala Gly Pro Ser Val225 230 235
240Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr
245 250 255Pro Glu Val Thr Cys Val Val Val Asp Val Ser His Glu Asp
Pro Glu 260 265 270Val Lys Phe Asn Trp Tyr Val Asp Gly Val Glu Val
His Asn Ala Lys 275 280 285Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser
Thr Tyr Arg Val Val Ser 290 295 300Val Leu Thr Val Leu His Gln Asp
Trp Leu Asn Gly Lys Glu Tyr Lys305 310 315 320Cys Lys Val Ser Asn
Lys Ala Leu Pro Ser Ser Ile Glu Lys Thr Ile 325 330 335Ser Lys Ala
Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro 340 345 350Pro
Ser Arg Glu Glu Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu 355 360
365Val Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn
370 375 380Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro Met Leu
Asp Ser385 390 395 400Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr
Val Asp Lys Ser Arg 405 410 415Trp Gln Gln Gly Asn Val Phe Ser Cys
Ser Val Met His Glu Ala Leu 420 425 430His Asn His Tyr Thr Gln Lys
Ser Leu Ser Leu Ser Pro Gly 435 440 44549450PRTArtificial
SequenceSynthetic Ab CD73.10 IgG1.1 full length HC (IgG1.1
IgG1.1(L234A/L235E/G237A) IgG1.1(A330S/P331S) IgG1.1) 49Gln Val Gln
Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro Gly Arg1 5 10 15Ser Leu
Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly
Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40
45Ala Val Ile Trp Tyr Asp Glu Ser Asn Lys Tyr Tyr Pro Asp Ser Val
50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys Asn Thr Leu
Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val
Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Ser Trp Tyr Pro Asp Ser Phe
Asp Ile Trp Gly 100 105 110Gln Gly Thr Met Val Thr Val Ser Ser Ala
Ser Thr Lys Gly Pro Ser 115 120 125Val Phe Pro Leu Ala Pro Ser Ser
Lys Ser Thr Ser Gly Gly Thr Ala 130 135 140Ala Leu Gly Cys Leu Val
Lys Asp Tyr Phe Pro Glu Pro Val Thr Val145 150 155 160Ser Trp Asn
Ser Gly Ala Leu Thr Ser Gly Val His Thr Phe Pro Ala 165 170 175Val
Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val Val Thr Val 180 185
190Pro Ser Ser Ser Leu Gly Thr Gln Thr Tyr Ile Cys Asn Val Asn His
195 200 205Lys Pro Ser Asn Thr Lys Val Asp Lys Lys Val Glu Pro Lys
Ser Cys 210 215 220Asp Lys Thr His Thr Cys Pro Pro Cys Pro Ala Pro
Glu Ala Glu Gly225 230 235 240Ala Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp Thr Leu Met 245 250 255Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp Val Ser His 260 265 270Glu Asp Pro Glu Val
Lys Phe Asn Trp Tyr Val Asp Gly Val Glu Val 275 280 285His Asn Ala
Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser Thr Tyr 290 295 300Arg
Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp Leu Asn Gly305 310
315 320Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro Ser Ser
Ile 325 330 335Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu
Pro Gln Val 340 345 350Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr
Lys Asn Gln Val Ser 355 360 365Leu Thr Cys Leu Val Lys Gly Phe Tyr
Pro Ser Asp Ile Ala Val Glu 370 375 380Trp Glu Ser Asn Gly Gln Pro
Glu Asn Asn Tyr Lys Thr Thr Pro Pro385 390 395 400Val Leu Asp Ser
Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val 405 410 415Asp Lys
Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys Ser Val Met 420 425
430His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu Ser Leu Ser
435 440 445Pro Gly 45050446PRTArtificial SequenceSynthetic Ab
CD73.4 IgG2 C219S full length HC 50Gln Val Gln Leu Val Glu Ser Gly
Gly Gly Val Val Gln Pro Gly Arg1 5 10 15Ser Leu Arg Leu Ser Cys Ala
Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met His Trp Val Arg
Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Val Ile Leu Tyr
Asp Gly Ser Asn Lys Tyr Tyr Pro Asp Ser Val 50 55 60Lys Gly Arg Phe
Thr Ile Ser Arg Asp Asn Ser Lys Asn Thr Leu Tyr65 70 75 80Leu Gln
Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala
Arg Gly Gly Ser Ser Trp Tyr Pro Asp Ser Phe Asp Ile Trp Gly 100 105
110Gln Gly Thr Met Val Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser
115 120 125Val Phe Pro Leu Ala Pro Cys Ser Arg Ser Thr Ser Glu Ser
Thr Ala 130 135 140Ala Leu Gly Cys Leu Val Lys Asp Tyr Phe Pro Glu
Pro Val Thr Val145 150 155 160Ser Trp Asn Ser Gly Ala Leu Thr Ser
Gly Val His Thr Phe Pro Ala 165 170 175Val Leu Gln Ser Ser Gly Leu
Tyr Ser Leu Ser Ser Val Val Thr Val 180 185 190Pro Ser Ser Asn Phe
Gly Thr Gln Thr Tyr Thr Cys Asn Val Asp His 195 200 205Lys Pro Ser
Asn Thr Lys Val Asp Lys Thr Val Glu Arg Lys Ser Cys 210 215 220Val
Glu Cys Pro Pro Cys Pro Ala Pro Pro Val Ala Gly Pro Ser Val225 230
235 240Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile Ser Arg
Thr 245 250 255Pro Glu Val Thr Cys Val Val Val Asp Val Ser His Glu
Asp Pro Glu 260 265 270Val Gln Phe Asn Trp Tyr Val Asp Gly Val Glu
Val His Asn Ala Lys 275 280 285Thr Lys Pro Arg Glu Glu Gln Phe Asn
Ser Thr Phe Arg Val Val Ser 290 295 300Val Leu Thr Val Val His Gln
Asp Trp Leu Asn Gly Lys Glu Tyr Lys305 310 315 320Cys Lys Val Ser
Asn Lys Gly Leu Pro Ala Pro Ile Glu Lys Thr Ile 325 330 335Ser Lys
Thr Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro 340 345
350Pro Ser Arg Glu Glu Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu
355 360 365Val Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp Glu
Ser Asn 370 375 380Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro
Met Leu Asp Ser385 390 395 400Asp Gly Ser Phe Phe Leu Tyr Ser Lys
Leu Thr Val Asp Lys Ser Arg 405 410 415Trp Gln Gln Gly Asn Val Phe
Ser Cys Ser Val Met His Glu Ala Leu 420 425 430His Asn His Tyr Thr
Gln Lys Ser Leu Ser Leu Ser Pro Gly 435 440 44551449PRTArtificial
SequenceSynthetic Ab CD73.3 IgG1.1 full length HC (IgG1.1
IgG1.1(L234A/L235E/G237A) IgG1.1(A330S/P331S) IgG1.1) 51Glu Val Gln
Leu Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Arg1 5 10 15Ser Leu
Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Asp Asp Tyr 20 25 30Ala
Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40
45Ser Gly Ile Ser Trp Lys Ser Gly Ser Ile Gly Tyr Ala Asp Ser Val
50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn Ser Leu
Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Val Leu
Tyr Tyr Cys 85 90 95Val Lys Gly Tyr Tyr Val Ile Leu Thr Gly Leu Asp
Tyr Trp Gly Gln 100 105 110Gly Thr Leu Val Thr Val Ser Ser Ala Ser
Thr Lys Gly Pro Ser Val 115 120 125Phe Pro Leu Ala Pro Ser Ser Lys
Ser Thr Ser Gly Gly Thr Ala Ala 130 135 140Leu Gly Cys Leu Val Lys
Asp Tyr Phe Pro Glu Pro Val Thr Val Ser145 150 155 160Trp Asn Ser
Gly Ala Leu Thr Ser Gly Val His Thr Phe Pro Ala Val 165 170 175Leu
Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser Val Val Thr Val Pro 180 185
190Ser Ser Ser Leu Gly Thr Gln Thr Tyr Ile Cys Asn Val Asn His Lys
195 200 205Pro Ser Asn Thr Lys Val Asp Lys Lys Val Glu Pro Lys Ser
Cys Asp 210 215 220Lys Thr His Thr Cys Pro Pro Cys Pro Ala Pro Glu
Ala Glu Gly Ala225 230 235 240Pro Ser Val Phe Leu Phe Pro Pro Lys
Pro Lys Asp Thr Leu Met Ile 245 250 255Ser Arg Thr Pro Glu Val Thr
Cys Val Val Val Asp Val Ser His Glu 260 265 270Asp Pro Glu Val Lys
Phe Asn Trp Tyr Val Asp Gly Val Glu Val His 275 280 285Asn Ala Lys
Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser Thr Tyr Arg 290 295 300Val
Val Ser Val Leu Thr Val Leu His Gln Asp Trp Leu Asn Gly Lys305 310
315 320Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro Ser Ser Ile
Glu 325 330 335Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu Pro
Gln Val Tyr 340 345 350Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys
Asn Gln Val Ser Leu 355 360 365Thr Cys Leu Val Lys Gly Phe Tyr Pro
Ser Asp Ile Ala Val Glu Trp 370 375 380Glu Ser Asn Gly Gln Pro Glu
Asn Asn Tyr Lys Thr Thr Pro Pro Val385 390 395 400Leu Asp Ser Asp
Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val Asp 405 410 415Lys Ser
Arg Trp Gln Gln Gly Asn Val Phe Ser Cys Ser Val Met His 420 425
430Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro
435 440 445Gly52326PRTArtificial SequenceSynthetic Full length
heavy chain constant region IgG2 IgG2 IgG2 IgG2 52Ala Ser Thr Lys
Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser
Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro
Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly
Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55
60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65
70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp
Lys 85 90 95Thr Val Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro
Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val
Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe
Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200
205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu
210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr
Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser
Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315
320Ser Leu Ser Pro Gly Lys 32553330PRTArtificial SequenceSynthetic
Full length heavy chain constant region IgG1 IgG1 IgG1 IgG1 53Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10
15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly
Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Lys Val Glu Pro Lys Ser Cys Asp Lys Thr
His Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly
Pro Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu
Met Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val Val Asp
Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr
Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170
175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu
180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val
Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser
Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu
Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser
Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala
Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys
Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu
Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295
300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr
Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
33054329PRTArtificial SequenceSynthetic Full length heavy chain
constant region IgG1 IgG1.1(L234A/L235E/G237A) IgG1.1 (A330S/P331S)
IgG1 54Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser
Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys
Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala
Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val
Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val
Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val
Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Lys Val Glu Pro
Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro Cys 100 105 110Pro Ala
Pro Glu Ala Glu Gly Ala Pro Ser Val Phe Leu Phe Pro Pro 115 120
125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys
130 135 140Val Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe
Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu Val His Asn Ala Lys
Thr Lys Pro Arg Glu 165 170 175Glu Gln Tyr Asn Ser Thr Tyr Arg Val
Val Ser Val Leu Thr Val Leu 180 185 190His Gln Asp Trp Leu Asn Gly
Lys Glu Tyr Lys Cys Lys Val Ser Asn 195 200 205Lys Ala Leu Pro Ser
Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly 210 215 220Gln Pro Arg
Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu225 230 235
240Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr
245 250 255Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu Asn 260 265 270Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp
Gly Ser Phe Phe 275 280 285Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser
Arg Trp Gln Gln Gly Asn 290 295 300Val Phe Ser Cys Ser Val Met His
Glu Ala Leu His Asn His Tyr Thr305 310 315 320Gln Lys Ser Leu Ser
Leu Ser Pro Gly 32555326PRTArtificial SequenceSynthetic Full length
heavy chain constant region IgG2 IgG2/IgG1 hybrid IgG1 IgG1 55Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Cys Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Pro Ser Val
Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser
Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser His
Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly
Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly 32556325PRTArtificial
SequenceSynthetic Full length heavy chain constant region IgG2 IgG2
IgG1.1(A330/P331S) IgG1 56Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn
Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu
Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro
Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ser Ser Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
325575PRTArtificial SequenceSynthetic Table 2 hinge domain 57Val
Asp Lys Arg Val1 5585PRTArtificial SequenceSynthetic Table 2 hinge
domain 58Val Asp Lys Thr Val1 55910PRTArtificial SequenceSynthetic
Table 2 hinge domain 59Glu Pro Lys Ser Cys Asp Lys Thr His Thr1 5
10603PRTArtificial SequenceSynthetic Table 2 hinge domain 60Glu Arg
Lys16112PRTArtificial SequenceSynthetic Table 2 hinge domain 61Glu
Leu Lys Thr Pro Leu Gly Asp Thr Thr His Thr1 5 10624PRTArtificial
SequenceSynthetic Table 2 hinge domain 62Glu Pro Lys
Ser1637PRTArtificial SequenceSynthetic Table 2 hinge domain 63Glu
Ser Lys Tyr Gly Pro Pro1 5645PRTArtificial SequenceSynthetic Table
2 hinge domain 64Cys Pro Pro Cys Pro1 5659PRTArtificial
SequenceSynthetic Table 2 hinge domain 65Cys Cys Val Glu Cys Pro
Pro Cys Pro1 5665PRTArtificial SequenceSynthetic Table 2 hinge
domain 66Cys Pro Arg Cys Pro1 56715PRTArtificial SequenceSynthetic
Table 2 hinge domain 67Glu Pro Lys Ser Cys Asp Thr Pro Pro Pro Cys
Pro Arg Cys Pro1 5 10 156811PRTArtificial SequenceSynthetic Table 2
hinge domain 68Cys Asp Thr Pro Pro Pro Cys Pro Arg Cys Pro1 5
10695PRTArtificial SequenceSynthetic Table 2 hinge domain 69Cys Pro
Ser Cys Pro1 5707PRTArtificial SequenceSynthetic Table 2 hinge
domain 70Ala Pro Glu Leu Leu Gly Gly1 5716PRTArtificial
SequenceSynthetic Table 2 hinge domain 71Ala Pro Pro Val Ala Gly1
572214PRTArtificial SequenceSynthetic Light chain 11F11 72Asp Ile
Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp
Arg Val Thr Ile Thr Cys Arg Ala Ser Gln Gly Ile Ser Ser Trp 20 25
30Leu Ala Trp Tyr Gln Gln Lys Pro Glu Lys Ala Pro Lys Ser Leu Ile
35 40 45Tyr Ala Ala Ser Ser Leu Gln Ser Gly Val Pro Ser Arg Phe Ser
Gly 50 55 60Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser Leu
Gln Pro65 70 75 80Glu Asp Phe Ala Thr Tyr Tyr Cys Gln Gln Tyr Asn
Ser Tyr Pro Leu 85 90 95Thr Phe Gly Gly Gly Thr Lys Val Glu Ile Lys
Arg Thr Val Ala Ala 100 105 110Pro Ser Val Phe Ile Phe Pro Pro Ser
Asp Glu Gln Leu Lys Ser Gly 115 120 125Thr Ala Ser Val Val Cys Leu
Leu Asn Asn Phe Tyr Pro Arg Glu Ala 130 135 140Lys Val Gln Trp Lys
Val Asp Asn Ala Leu Gln Ser Gly Asn Ser Gln145 150 155 160Glu Ser
Val Thr Glu Gln Asp Ser Lys Asp Ser Thr Tyr Ser Leu Ser 165 170
175Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu Lys His Lys Val Tyr
180 185 190Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser Pro Val Thr
Lys Ser 195 200 205Phe Asn Arg Gly Glu Cys 21073214PRTArtificial
SequenceSynthetic Light chain 4C3 73Glu Ile Val Leu Thr Gln Ser Pro
Gly Thr Leu Ser Leu Ser Pro Gly1 5 10 15Glu Arg Ala Thr Leu Ser Cys
Arg Ala Ser Gln Ser Val Ser Ser Tyr 20 25 30Leu Ala Trp Tyr Gln Gln
Lys Pro Gly Gln Ala Pro Arg Leu Leu Ile 35 40 45Tyr Gly Ala Ser Ser
Arg Ala Thr Gly Ile Pro Asp Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly
Thr Asp Phe Thr Leu Thr Ile Ser Arg Leu Glu Pro65 70 75 80Glu Asp
Phe Ala Val Tyr Tyr Cys Gln Gln Tyr Gly Ser Ser Pro Leu 85 90 95Thr
Phe Gly Gly Gly Thr Lys Val Glu Ile Lys Arg Thr Val Ala Ala 100 105
110Pro Ser Val Phe Ile Phe Pro Pro Ser Asp Glu Gln Leu Lys Ser Gly
115 120 125Thr Ala Ser Val Val Cys Leu Leu Asn Asn Phe Tyr Pro Arg
Glu Ala 130 135 140Lys Val Gln Trp Lys Val Asp Asn Ala Leu Gln Ser
Gly Asn Ser Gln145 150 155 160Glu Ser Val Thr Glu Gln Asp Ser Lys
Asp Ser Thr Tyr Ser Leu Ser 165 170 175Ser Thr Leu Thr Leu Ser Lys
Ala Asp Tyr Glu Lys His Lys Val Tyr 180 185 190Ala Cys Glu Val Thr
His Gln Gly Leu Ser Ser Pro Val Thr Lys Ser 195 200 205Phe Asn Arg
Gly Glu Cys 21074214PRTArtificial SequenceSynthetic Light chain
6D11 74Glu Ile Val Leu Thr Gln Ser Pro Gly Thr Leu Ser Leu Ser Pro
Gly1 5 10 15Glu Arg Ala Thr Leu Ser Cys Arg Ala Ser Gln Ser Val Ser
Ser Ser 20 25 30Tyr Leu Ala Trp Tyr Gln Gln Lys Pro Gly Gln Ala Pro
Arg Leu Leu 35 40 45Ile Tyr Gly Ala Ser Ser Arg Ala Thr Gly Ile Pro
Asp Arg Phe Ser 50 55 60Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr
Ile Ser Arg Leu Glu65 70 75 80Pro Glu Asp Phe Ala Val Tyr Tyr Cys
Gln His Tyr Gly Ser Ser Phe 85 90 95Thr Phe Gly Pro Gly Thr Lys Val
Asp Ile Lys Arg Thr Val Ala Ala 100 105 110Pro Ser Val Phe Ile Phe
Pro Pro Ser Asp Glu Gln Leu Lys Ser Gly 115 120 125Thr Ala Ser Val
Val Cys Leu Leu Asn Asn Phe Tyr Pro Arg Glu Ala 130 135 140Lys Val
Gln Trp Lys Val Asp Asn Ala Leu Gln Ser Gly Asn Ser Gln145 150 155
160Glu Ser Val Thr Glu Gln Asp Ser Lys Asp Ser Thr Tyr Ser Leu Ser
165 170 175Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu Lys His Lys
Val Tyr 180 185 190Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser Pro
Val Thr Lys Ser 195 200 205Phe Asn Arg Gly Glu Cys
21075124PRTArtificial SequenceSynthetic Anti GITR AbVH 75Gln Val
Gln Leu Val Glu Ser Gly Gly Gly Val Val Gln Pro Gly Arg1 5 10 15Ser
Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Ser Tyr 20 25
30Gly Met His Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val
35 40 45Ala Val Ile Trp Tyr Glu Gly Ser Asn Lys Tyr Tyr Ala Asp Ser
Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ser Lys Asn Thr
Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala
Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Ser Met Val Arg Gly Asp Tyr
Tyr Tyr Gly Met Asp 100 105 110Val Trp Gly Gln Gly Thr Thr Val Thr
Val Ser Ser 115 12076107PRTArtificial SequenceSynthetic Anti GITR
Ab VL 76Ala Ile Gln Leu Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val
Gly1 5 10 15Asp Arg Val Thr Ile Thr Cys Arg Ala Ser Gln Gly Ile Ser
Ser Ala 20 25 30Leu Ala Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys
Leu Leu Ile 35 40 45Tyr Asp Ala Ser Ser Leu Glu Ser Gly Val Pro Ser
Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile
Ser Ser Leu Gln Pro65 70 75 80Glu Asp Phe Ala Thr Tyr Tyr Cys Gln
Gln Phe Asn Ser Tyr Pro Tyr 85 90 95Thr Phe Gly Gln Gly Thr Lys Leu
Glu Ile Lys 100 10577214PRTArtificial SequenceSynthetic Anti GITR
Ab LC 77Ala Ile Gln Leu Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val
Gly1 5 10 15Asp Arg Val Thr Ile Thr Cys Arg Ala Ser Gln Gly Ile Ser
Ser Ala 20 25 30Leu Ala Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys
Leu Leu Ile 35 40 45Tyr Asp Ala Ser Ser Leu Glu Ser Gly Val Pro Ser
Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile
Ser Ser Leu Gln Pro65 70 75 80Glu Asp Phe Ala Thr Tyr Tyr Cys Gln
Gln Phe Asn Ser Tyr Pro Tyr 85 90 95Thr Phe Gly Gln Gly Thr Lys Leu
Glu Ile Lys Arg Thr Val Ala Ala 100 105 110Pro Ser Val Phe Ile Phe
Pro Pro Ser Asp Glu Gln Leu Lys Ser Gly 115 120 125Thr Ala Ser Val
Val Cys Leu Leu Asn Asn Phe Tyr Pro Arg Glu Ala 130 135 140Lys Val
Gln Trp Lys Val Asp Asn Ala Leu Gln Ser Gly Asn Ser Gln145 150 155
160Glu Ser Val Thr Glu Gln Asp Ser Lys Asp Ser Thr Tyr Ser Leu Ser
165 170 175Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu Lys His Lys
Val Tyr 180 185 190Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser Pro
Val Thr Lys Ser 195 200 205Phe Asn Arg Gly Glu Cys
21078330PRTArtificial SequenceSynthetic IgG1f 78Ala Ser Thr Lys Gly
Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly
Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu
Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val
His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu
Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75
80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys
85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro
Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu
Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr
Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp
Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val
Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170
175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu
180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val
Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser
Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu
Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser
Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala
Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys
Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu
Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295
300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr
Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
33079326PRTArtificial SequenceSynthetic IgG2.3 79Ala Ser Thr Lys
Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser
Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro
Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly
Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55
60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65
70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp
Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro
Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val
Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe
Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200
205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu
210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr
Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser
Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315
320Ser Leu Ser Pro Gly Lys 32580327PRTArtificial SequenceSynthetic
IgG2.3G1 AY 80Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro
Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu
Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser
Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln
Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser
Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His
Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser
Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly
Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr
Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135
140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230 235 240Asn
Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250
255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys
260 265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu
Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly
Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala Leu His Asn
His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
32581326PRTArtificial SequenceSynthetic IgG2.3G1 KH 81Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr
Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln
Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe
Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro
Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro
Glu Val Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val
His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser
Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp 180 185
190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro
195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro
Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu
Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys
Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn
Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Val Leu
Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val
Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser
Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310
315 320Ser Leu Ser Pro Gly Lys 32582326PRTArtificial
SequenceSynthetic IgG2.5 82Ala Ser Thr Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu
Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser
Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr
Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn
Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu
Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro
Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120
125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
130 135 140Val Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr Val
Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser Val Leu
Thr Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile Glu Lys
Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235
240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly
Lys 32583330PRTArtificial SequenceSynthetic IgG1.1f 83Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr
Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln
Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr
Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Ala Glu Gly Ala Pro Ser
Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met Ile
Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val Ser
His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val Asp
Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170 175Glu
Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu 180 185
190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn
195 200 205Lys Ala Leu Pro Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala
Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro
Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser Leu Thr
Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu
Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr
Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser
Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295 300Val
Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr305 310
315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
33084326PRTArtificial SequenceSynthetic IgG2.3G1.1f KH 84Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu
Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr
Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp
Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu
Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170
175Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala
Leu Pro 195 200 205Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 32585327PRTArtificial
SequenceSynthetic IgG1 deltaTHT 85Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile
Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Arg
Val Glu Pro Lys Ser Cys Asp Lys Cys Pro Pro Cys Pro Ala Pro 100 105
110Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys
115 120 125Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val
Val Val 130 135 140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn
Trp Tyr Val Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr
Lys Pro Arg Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val
Ser Val Leu Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys
Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro
Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu
Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230
235 240Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser
Asp 245 250 255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
Asn Tyr Lys 260 265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser
Phe Phe Leu Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys 32586329PRTArtificial
SequenceSynthetic IgG2.3 plusTHT 86Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr
Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr
Val Glu Arg Lys Ser Cys Val Glu Thr His Thr Cys Pro Pro Cys 100 105
110Pro Ala Pro Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys
115 120 125Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr
Cys Val 130 135 140Val Val Asp Val Ser His Glu Asp Pro Glu Val Gln
Phe Asn Trp Tyr145 150 155 160Val Asp Gly Val Glu Val His Asn Ala
Lys Thr Lys Pro Arg Glu Glu 165 170 175Gln Phe Asn Ser Thr Phe Arg
Val Val Ser Val Leu Thr Val Val His 180 185 190Gln Asp Trp Leu Asn
Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys 195 200 205Gly Leu Pro
Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln 210 215 220Pro
Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met225 230
235 240Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr
Pro 245 250 255Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu Asn Asn 260 265 270Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser Asp
Gly Ser Phe Phe Leu 275 280 285Tyr Ser Lys Leu Thr Val Asp Lys Ser
Arg Trp Gln Gln Gly Asn Val 290 295 300Phe Ser Cys Ser Val Met His
Glu Ala Leu His Asn His Tyr Thr Gln305 310 315 320Lys Ser Leu Ser
Leu Ser Pro Gly Lys 32587329PRTArtificial SequenceSynthetic IgG2.3
plusGGG 87Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys
Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val
Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly
Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser
Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser
Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys
Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys
Val Glu Gly Gly Gly Cys Pro Pro Cys 100 105 110Pro Ala Pro Pro Val
Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys 115 120 125Pro Lys Asp
Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val 130 135 140Val
Val Asp Val Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr145 150
155 160Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu
Glu 165 170 175Gln Phe Asn Ser Thr Phe Arg Val Val Ser Val Leu Thr
Val Val His 180 185 190Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys
Lys Val Ser Asn Lys 195 200 205Gly Leu Pro Ala Pro Ile Glu Lys Thr
Ile Ser Lys Thr Lys Gly Gln 210 215 220Pro Arg Glu Pro Gln Val Tyr
Thr Leu Pro Pro Ser Arg Glu Glu Met225 230 235 240Thr Lys Asn Gln
Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro 245 250 255Ser Asp
Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn 260 265
270Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu
275 280 285Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly
Asn Val 290 295 300Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn
His Tyr Thr Gln305 310 315 320Lys Ser Leu Ser Leu Ser Pro Gly Lys
32588326PRTArtificial SequenceSynthetic IgG2.5G1.1f KH 88Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Cys Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu
Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr
Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp
Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu
Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170
175Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala
Leu Pro 195 200 205Ser Ser Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 32589327PRTArtificial
SequenceSynthetic IgG2.5G1 AY 89Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys
115 120 125Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val
Val Val 130 135 140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn
Trp Tyr Val Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr
Lys Pro Arg Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val
Ser Val Leu Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys
Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro
Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu
Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230
235 240Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser
Asp 245 250 255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
Asn Tyr Lys 260 265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser
Phe Phe Leu Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala
Leu His Asn His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser
Pro Gly Lys 32590326PRTArtificial SequenceSynthetic IgG2.5G1 KH
90Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Arg1
5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp
Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu
Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly
Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe
Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser
Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Cys Cys Val Glu
Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val
Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser
Arg Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His
Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly145 150 155
160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn
165 170 175Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln
Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn
Lys Ala Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala
Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro
Ser Arg Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr
Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu
Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr
Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280
285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys
290 295 300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser Leu305 310 315 320Ser Leu Ser Pro Gly Lys 32591329PRTArtificial
SequenceSynthetic IgG2.5 plusTHT 91Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr
Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr
Val Glu Arg Lys Cys Cys Val Glu Thr His Thr Cys Pro Pro Cys 100 105
110Pro Ala Pro Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys
115 120 125Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr
Cys Val 130 135 140Val Val Asp Val Ser His Glu Asp Pro Glu Val Gln
Phe Asn Trp Tyr145 150 155 160Val Asp Gly Val Glu Val His Asn Ala
Lys Thr Lys Pro Arg Glu Glu 165 170 175Gln Phe Asn Ser Thr Phe Arg
Val Val Ser Val Leu Thr Val Val His 180 185 190Gln Asp Trp Leu Asn
Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys 195 200 205Gly Leu Pro
Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln 210 215 220Pro
Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met225 230
235 240Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr
Pro 245 250 255Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu Asn Asn 260 265 270Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser Asp
Gly Ser Phe Phe Leu 275 280 285Tyr Ser Lys Leu Thr Val Asp Lys Ser
Arg Trp Gln Gln Gly Asn Val 290 295 300Phe Ser Cys Ser Val Met His
Glu Ala Leu His Asn His Tyr Thr Gln305 310 315 320Lys Ser Leu Ser
Leu Ser Pro Gly Lys 32592327PRTArtificial SequenceSynthetic IgG1
G2.3G1 AY 92Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser
Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val
Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly
Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser
Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser
Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys
Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Arg Val Glu Arg Lys Ser Cys
Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly
Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu
Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp
Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150
155 160Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln
Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu
His Gln Asp 180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val
Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser
Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu
Pro Pro Ser Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser
Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala
Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265
270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser
275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val
Phe Ser 290 295 300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr
Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
32593326PRTArtificial SequenceSynthetic IgG1 G2.3G1 KH 93Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser
Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro
Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val
Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr
Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200
205Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu
210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr
Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Val Leu Asp Ser
Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315
320Ser Leu Ser Pro Gly Lys 32594330PRTArtificial SequenceSynthetic
G2 G1 G1 G1 94Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro
Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu
Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser
Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln
Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser
Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His
Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser
Cys Asp Lys Thr His Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu
Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro
Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135
140Val Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn
Trp145 150 155 160Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr
Lys Pro Arg Glu 165 170 175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val
Ser Val Leu Thr Val Leu 180 185 190His Gln Asp Trp Leu Asn Gly Lys
Glu Tyr Lys Cys Lys Val Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro
Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu
Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu225 230 235 240Met
Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250
255Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
260 265 270Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser
Phe Phe 275 280 285Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly Asn 290 295 300Val Phe Ser Cys Ser Val Met His Glu Ala
Leu His Asn His Tyr Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser
Pro Gly Lys 325 33095330PRTArtificial SequenceSynthetic G2.5 G1 G1
G1 95Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser
Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys
Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala
Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser
Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn
Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro
Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Asp
Lys Thr His Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu
Gly Gly Pro Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp
Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val
Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155
160Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu
165 170 175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr
Val Leu 180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys
Lys Val Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr
Ile Ser Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr
Thr Leu Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln
Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp
Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn
Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280
285Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn
290 295 300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His
Tyr Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
33096326PRTArtificial SequenceSynthetic G1 G2.3 G2 G2 96Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr
Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln
Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe
Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro
Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro
Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val
His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser
Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185
190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro
195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro
Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu
Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys
Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn
Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu
Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val
Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser
Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310
315 320Ser Leu Ser Pro Gly Lys 32597330PRTArtificial
SequenceSynthetic G1 KRGEGSSNLF 97Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Ile
Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Arg
Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro Cys 100 105
110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro
115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp Pro Glu Val
Lys Phe Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu 165 170 175Glu Gln Tyr Asn Ser Thr Tyr
Arg Val Val Ser Val Leu Thr Val Leu 180 185 190His Gln Asp Trp Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn 195 200 205Lys Ala Leu
Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly 210 215 220Gln
Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu225 230
235 240Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser
Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser Lys Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn 290 295 300Val Phe Ser Cys Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr305 310 315 320Gln Lys Ser Leu
Ser Leu Ser Pro Gly Lys 325 33098330PRTArtificial SequenceSynthetic
G1 KRGEGS 98Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser
Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val
Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly
Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser
Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser
Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys
Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys
Asp Lys Thr His Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu
Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys
Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val
Val Val Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150
155 160Tyr Val Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu 165 170 175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu 180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn
Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser
Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265
270Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe
275 280 285Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln
Gly Asn 290 295 300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His
Asn His Tyr Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly
Lys 325 33099330PRTArtificial SequenceSynthetic G1 SNLF 99Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser
Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His
Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro
Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met
Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val
Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val
Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170
175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu
180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val
Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser
Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu
Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser
Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala
Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys
Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu
Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295
300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr
Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
330100330PRTArtificial SequenceSynthetic IgG1 ITNDRTPR 100Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser
Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Asp Lys Thr His
Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro
Ser Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met
Ile Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val
Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val
Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170
175Glu Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu
180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val
Ser Asn 195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser
Lys Ala Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr
Leu
Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser
Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala
Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys
Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu
Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295
300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr
Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
330101329PRTArtificial SequenceSynthetic G1 SNLFPR 101Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr
Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln
Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Arg Val Glu Arg Lys Ser Cys Asp Lys Thr His Thr
Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser
Val Phe Leu Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met Ile
Ser Arg Thr Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val Ser
His Glu Asp Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val Asp
Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170 175Glu
Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu 180 185
190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn
195 200 205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala
Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro
Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser Leu Thr
Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu
Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr
Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser
Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295 300Val
Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr305 310
315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly 325102326PRTArtificial
SequenceSynthetic G2 RKEGSGNSFL 102Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Cys Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Thr
Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr
Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val
Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp
Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys
Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser
Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu
Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile
Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230
235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp
Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn
Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe
Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln
Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu
His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro
Gly Lys 325103326PRTArtificial SequenceSynthetic G2 RKEGSG 103Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Lys1 5 10
15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu
Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170
175Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly
Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 325104326PRTArtificial
SequenceSynthetic G2 NSFL 104Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val
Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp
Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys
Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser
Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu
Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile
Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230
235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp
Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn
Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe
Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln
Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu
His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro
Gly Lys 325105326PRTArtificial SequenceSynthetic IgG2 TIDNTRRP
105Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1
5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp
Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu
Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly
Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe
Gly Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser
Asn Thr Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Val Glu
Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val
Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser
Arg Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His
Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155
160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn
165 170 175Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln
Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn
Lys Gly Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr
Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro
Ser Arg Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr
Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu
Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr
Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280
285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys
290 295 300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser Leu305 310 315 320Ser Leu Ser Pro Gly Lys
325106326PRTArtificial SequenceSynthetic G2 NSFLRP 106Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr
Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln
Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Thr Val Glu Pro Lys Ser Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe
Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro
Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro
Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val
His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser
Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185
190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro
195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro
Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu
Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys
Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn
Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu
Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val
Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser
Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310
315 320Ser Leu Ser Pro Gly Lys 325107330PRTArtificial
SequenceSynthetic G1 G1 G2 G1 AY 107Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75 80Tyr Ile
Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Arg
Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro Cys 100 105
110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro
115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp Pro Glu Val
Gln Phe Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu 165 170 175Glu Gln Phe Asn Ser Thr Phe
Arg Val Val Ser Val Leu Thr Val Val 180 185 190His Gln Asp Trp Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn 195 200 205Lys Gly Leu
Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly 210 215 220Gln
Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu225 230
235 240Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr Pro Pro Val Leu Asp Ser
Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser Lys Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn 290 295 300Val Phe Ser Cys Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr305 310 315 320Gln Lys Ser Leu
Ser Leu Ser Pro Gly Lys 325 330108329PRTArtificial
SequenceSynthetic G1 G1 G2 G1 KH 108Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His
Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Pro Val Ala Gly Pro Ser
Val Phe Leu Phe Pro Pro Lys 115 120 125Pro Lys Asp Thr Leu Met Ile
Ser Arg Thr Pro Glu Val Thr Cys Val 130 135 140Val Val Asp Val Ser
His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr145 150 155 160Val Asp
Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu 165 170
175Gln Phe Asn Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His
180 185 190Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys 195 200 205Gly Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys
Thr Lys Gly Gln 210 215 220Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro
Pro Ser Arg Glu Glu Met225 230 235 240Thr Lys Asn Gln Val Ser Leu
Thr Cys Leu Val Lys Gly Phe Tyr Pro 245 250 255Ser Asp Ile Ala Val
Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn 260 265 270Tyr Lys Thr
Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu 275 280 285Tyr
Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val 290 295
300Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr
Gln305 310 315 320Lys Ser Leu Ser Leu Ser Pro Gly Lys
325109326PRTArtificial SequenceSynthetic G2 G2.3 G1 G2 KH 109Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu
Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170
175Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala
Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 325110326PRTArtificial
SequenceSynthetic G2.5 G2.3 G1 G2 KH 110Ala Ser Thr Lys Gly Pro Ser
Val Phe Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr
Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr
Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser
Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr
Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90
95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro
100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro
Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys
Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val Lys Phe
Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys
Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170 175Ser Thr Tyr Arg Val
Val Ser Val Leu Thr Val Leu His Gln Asp Trp 180 185 190Leu Asn Gly
Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro 195 200 205Ala
Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg Glu 210 215
220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys
Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr
Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro
Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp
Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser
Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His
Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser
Leu Ser Pro Gly Lys 325111326PRTArtificial SequenceSynthetic G2
G2.3 G1 G2 AY 111Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala
Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys
Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn
Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu
Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro
Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp
His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys
Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu
Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp
Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135
140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val
Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val Ser Val Leu
Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys
Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230 235 240Asn
Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250
255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys
260 265 270Thr Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu
Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly
Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala Leu His Asn
His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser Pro Gly
325112327PRTArtificial SequenceSynthetic G2.5 G2.3 G1 G2 AY 112Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Pro Ser Val
Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser
Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser His
Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly
Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325113326PRTArtificial SequenceSynthetic G1 G2.3 G1 G1 KH 113Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10
15Ser Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly
Thr Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu
Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn 165 170
175Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala
Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 325114330PRTArtificial
SequenceSynthetic G2 G1 G2 G2 AY 114Ala Ser Thr Lys Gly Pro Ser Val
Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala
Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr
Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe
Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val
Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr
Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr
Val Glu Arg Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro Cys 100 105
110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro
115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp Pro Glu Val
Gln Phe Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu 165 170 175Glu Gln Phe Asn Ser Thr Phe
Arg Val Val Ser Val Leu Thr Val Val 180 185 190His Gln Asp Trp Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn 195 200 205Lys Gly Leu
Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly 210 215 220Gln
Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu225 230
235 240Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser
Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser Lys Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn 290 295 300Val Phe Ser Cys Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr305 310 315 320Gln Lys Ser Leu
Ser Leu Ser Pro Gly Lys 325 330115330PRTArtificial
SequenceSynthetic G2.5 G1 G2 G2 AY 115Ala Ser Thr Lys Gly Pro Ser
Val Phe Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr
Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr
Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser
Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr
Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90
95Thr Val Glu Arg Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro Cys
100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe
Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr Pro
Glu Val Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp Pro
Glu Val Gln Phe Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu Val
His Asn Ala Lys Thr Lys Pro Arg Glu
165 170 175Glu Gln Phe Asn Ser Thr Phe Arg Val Val Ser Val Leu Thr
Val Val 180 185 190His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys
Lys Val Ser Asn 195 200 205Lys Gly Leu Pro Ala Pro Ile Glu Lys Thr
Ile Ser Lys Thr Lys Gly 210 215 220Gln Pro Arg Glu Pro Gln Val Tyr
Thr Leu Pro Pro Ser Arg Glu Glu225 230 235 240Met Thr Lys Asn Gln
Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp
Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn
Tyr Lys Thr Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe 275 280
285Leu Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn
290 295 300Val Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His
Tyr Thr305 310 315 320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
330116327PRTArtificial SequenceSynthetic G1 G2 G1 G1 AY 116Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser
Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser His Glu
Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325117328PRTArtificial SequenceSynthetic G2 G1 G2 G2 KH 117Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Asp Lys Thr His
Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Pro Val Ala Gly Pro Ser
Val Phe Leu Phe Pro Pro Lys 115 120 125Pro Lys Asp Thr Leu Met Ile
Ser Arg Thr Pro Glu Val Thr Cys Val 130 135 140Val Val Asp Val Ser
His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr145 150 155 160Val Asp
Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu 165 170
175Gln Phe Asn Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His
180 185 190Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys 195 200 205Gly Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys
Thr Lys Gly Gln 210 215 220Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro
Pro Ser Arg Glu Glu Met225 230 235 240Thr Lys Asn Gln Val Ser Leu
Thr Cys Leu Val Lys Gly Phe Tyr Pro 245 250 255Ser Asp Ile Ala Val
Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn 260 265 270Tyr Lys Thr
Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu 275 280 285Tyr
Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val 290 295
300Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr
Gln305 310 315 320Lys Ser Leu Ser Leu Ser Pro Gly
325118329PRTArtificial SequenceSynthetic G2.5 G1 G2 G2 KH 118Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Asp Lys Thr
His Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Pro Val Ala Gly Pro
Ser Val Phe Leu Phe Pro Pro Lys 115 120 125Pro Lys Asp Thr Leu Met
Ile Ser Arg Thr Pro Glu Val Thr Cys Val 130 135 140Val Val Asp Val
Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr145 150 155 160Val
Asp Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu 165 170
175Gln Phe Asn Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His
180 185 190Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys 195 200 205Gly Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys
Thr Lys Gly Gln 210 215 220Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro
Pro Ser Arg Glu Glu Met225 230 235 240Thr Lys Asn Gln Val Ser Leu
Thr Cys Leu Val Lys Gly Phe Tyr Pro 245 250 255Ser Asp Ile Ala Val
Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn 260 265 270Tyr Lys Thr
Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu 275 280 285Tyr
Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val 290 295
300Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr
Gln305 310 315 320Lys Ser Leu Ser Leu Ser Pro Gly Lys
325119323PRTArtificial SequenceSynthetic IgG1 deltaHinge 119Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser
Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Cys Pro Pro Cys Pro Ala
Pro Glu Leu Leu Gly 100 105 110Gly Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp Thr Leu Met 115 120 125Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp Val Ser His 130 135 140Glu Asp Pro Glu Val
Lys Phe Asn Trp Tyr Val Asp Gly Val Glu Val145 150 155 160His Asn
Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr Asn Ser Thr Tyr 165 170
175Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp Trp Leu Asn Gly
180 185 190Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu Pro Ala
Pro Ile 195 200 205Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg
Glu Pro Gln Val 210 215 220Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met
Thr Lys Asn Gln Val Ser225 230 235 240Leu Thr Cys Leu Val Lys Gly
Phe Tyr Pro Ser Asp Ile Ala Val Glu 245 250 255Trp Glu Ser Asn Gly
Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro 260 265 270Val Leu Asp
Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr Val 275 280 285Asp
Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys Ser Val Met 290 295
300His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu Ser Leu
Ser305 310 315 320Pro Gly Lys120322PRTArtificial SequenceSynthetic
IgG2 deltaHinge 120Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala
Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys
Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn
Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu
Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro
Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp
His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys
Cys Pro Pro Cys Pro Ala Pro Pro Val Ala Gly 100 105 110Pro Ser Val
Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met Ile 115 120 125Ser
Arg Thr Pro Glu Val Thr Cys Val Val Val Asp Val Ser His Glu 130 135
140Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly Val Glu Val
His145 150 155 160Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn
Ser Thr Phe Arg 165 170 175Val Val Ser Val Leu Thr Val Val His Gln
Asp Trp Leu Asn Gly Lys 180 185 190Glu Tyr Lys Cys Lys Val Ser Asn
Lys Gly Leu Pro Ala Pro Ile Glu 195 200 205Lys Thr Ile Ser Lys Thr
Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr 210 215 220Thr Leu Pro Pro
Ser Arg Glu Glu Met Thr Lys Asn Gln Val Ser Leu225 230 235 240Thr
Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val Glu Trp 245 250
255Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr Thr Pro Pro Met
260 265 270Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys Leu Thr
Val Asp 275 280 285Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys
Ser Val Met His 290 295 300Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser Leu Ser Leu Ser Pro305 310 315 320Gly Lys121322PRTArtificial
SequenceSynthetic IgG2.5 deltaHinge 121Ala Ser Thr Lys Gly Pro Ser
Val Phe Pro Leu Ala Pro Ser Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr
Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr
Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser
Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr
Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90
95Thr Val Glu Arg Lys Cys Pro Pro Cys Pro Ala Pro Pro Val Ala Gly
100 105 110Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu
Met Ile 115 120 125Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp
Val Ser His Glu 130 135 140Asp Pro Glu Val Gln Phe Asn Trp Tyr Val
Asp Gly Val Glu Val His145 150 155 160Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Phe Asn Ser Thr Phe Arg 165 170 175Val Val Ser Val Leu
Thr Val Val His Gln Asp Trp Leu Asn Gly Lys 180 185 190Glu Tyr Lys
Cys Lys Val Ser Asn Lys Gly Leu Pro Ala Pro Ile Glu 195 200 205Lys
Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr 210 215
220Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn Gln Val Ser
Leu225 230 235 240Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile
Ala Val Glu Trp 245 250 255Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr
Lys Thr Thr Pro Pro Met 260 265 270Leu Asp Ser Asp Gly Ser Phe Phe
Leu Tyr Ser Lys Leu Thr Val Asp 275 280 285Lys Ser Arg Trp Gln Gln
Gly Asn Val Phe Ser Cys Ser Val Met His 290 295 300Glu Ala Leu His
Asn His Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro305 310 315 320Gly
Lys122328PRTArtificial SequenceSynthetic IgG1 deltaG237 122Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser
Thr Ser Gly Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr
Gln Thr65 70 75 80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His
Thr Cys Pro Pro Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Pro Ser
Val Phe Leu Phe Pro Pro Lys 115 120 125Pro Lys Asp Thr Leu Met Ile
Ser Arg Thr Pro Glu Val Thr Cys Val 130 135 140Val Val Asp Val Ser
His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr145 150 155 160Val Asp
Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu 165 170
175Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His
180 185 190Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys 195 200 205Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys
Ala Lys Gly Gln 210 215 220Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro
Pro Ser Arg Glu Glu Met225 230 235 240Thr Lys Asn Gln Val Ser Leu
Thr Cys Leu Val Lys Gly Phe Tyr Pro 245 250 255Ser Asp Ile Ala Val
Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn 260 265 270Tyr Lys Thr
Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu 275 280 285Tyr
Ser Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val 290 295
300Phe Ser Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr
Gln305 310 315 320Lys Ser
Leu Ser Leu Ser Pro Gly 325123327PRTArtificial SequenceSynthetic
IgG2 plusG237 123Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala
Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys
Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn
Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu
Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro
Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp
His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys
Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala
Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp
Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135
140Asp Val Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr Val
Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg
Glu Glu Gln Phe 165 170 175Asn Ser Thr Phe Arg Val Val Ser Val Leu
Thr Val Val His Gln Asp 180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys
Cys Lys Val Ser Asn Lys Gly Leu 195 200 205Pro Ala Pro Ile Glu Lys
Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg 210 215 220Glu Pro Gln Val
Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230 235 240Asn
Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250
255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys
260 265 270Thr Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu
Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly
Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala Leu His Asn
His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325124326PRTArtificial SequenceSynthetic IgG2.4 124Ala Ser Thr Lys
Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser
Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro
Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly
Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55
60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65
70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp
Lys 85 90 95Thr Val Glu Arg Lys Cys Ser Val Glu Cys Pro Pro Cys Pro
Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro
Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val
Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro Glu Val
Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn
Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe
Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu
Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200
205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu
210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr
Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe
Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln
Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser
Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys
Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met
His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310 315
320Ser Leu Ser Pro Gly Lys 325125326PRTArtificial SequenceSynthetic
IgG2.3/4 125Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys
Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val
Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly
Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser
Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser
Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys
Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Ser
Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro
Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met
Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val
Ser His Glu Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150
155 160Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe
Asn 165 170 175Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His
Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys
Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro
Pro Ser Arg Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu
Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val
Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265
270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys
275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe
Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr
Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly Lys
32512618PRTArtificial SequenceSynthetic Hinge IgG2 C220S 126Glu Arg
Lys Cys Ser Val Glu Cys Pro Pro Cys Pro Ala Pro Pro Val1 5 10 15Ala
Gly12719PRTArtificial SequenceSynthetic IgG2/IgG1 hybrid hinge
C220S 127Glu Arg Lys Cys Ser Val Glu Cys Pro Pro Cys Pro Ala Pro
Glu Leu1 5 10 15Leu Gly Gly12814PRTHomo
sapiensmisc_feature(1)..(14)Wildtype IgG2 hinge portion 128Glu Arg
Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro1 5
1012914PRTArtificial SequenceSynthetic IgG2 hinge portion C219S
129Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro1 5
1013014PRTArtificial SequenceSynthetic IgG2 hinge portion C220S
130Glu Arg Lys Cys Ser Val Glu Cys Pro Pro Cys Pro Ala Pro1 5
1013114PRTArtificial SequenceSynthetic IgG2 hinge portion
C219Xmisc_feature(4)..(4)Xaa is any amino acid, except cysteine
131Glu Arg Lys Xaa Cys Val Glu Cys Pro Pro Cys Pro Ala Pro1 5
1013214PRTArtificial SequenceSynthetic IgG2 hinge portion
C220Xmisc_feature(5)..(5)Xaa is any amino acid, except cysteine
132Glu Arg Lys Cys Xaa Val Glu Cys Pro Pro Cys Pro Ala Pro1 5
10133116PRTHomo sapiensmisc_feature(1)..(116)IgG2 CH1+IgG2 hinge
(wildtype) 133Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro
Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu
Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser
Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln
Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser
Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His
Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Cys
Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly
11513418PRTArtificial SequenceSynthetic IgG2 with
C219Xmisc_feature(4)..(4)Xaa is any amino acid, except cysteine
134Glu Arg Lys Xaa Cys Val Glu Cys Pro Pro Cys Pro Ala Pro Pro Val1
5 10 15Ala Gly13518PRTArtificial SequenceSynthetic IgG2 with
C220Xmisc_feature(5)..(5)Xaa is any amino acid, except cysteine
135Glu Arg Lys Cys Xaa Val Glu Cys Pro Pro Cys Pro Ala Pro Pro Val1
5 10 15Ala Gly13619PRTArtificial SequenceSynthetic IgG2/IgG1 hybrid
with C219Xmisc_feature(4)..(4)Xaa is any amino acid, except
cysteine 136Glu Arg Lys Xaa Cys Val Glu Cys Pro Pro Cys Pro Ala Pro
Glu Leu1 5 10 15Leu Gly Gly13718PRTArtificial SequenceSynthetic
IgG2/IgG1 hybrid with C220X 137Glu Arg Lys Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro Glu Leu Leu1 5 10 15Gly Gly13818PRTArtificial
SequenceSynthetic IgG2/IgG1 hybrid deltaG 138Glu Arg Lys Cys Cys
Val Glu Cys Pro Pro Cys Pro Ala Pro Glu Leu1 5 10 15Leu
Gly13918PRTArtificial SequenceSynthetic IgG2/IgG1 hybrid with C219S
deltaG 139Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro
Glu Leu1 5 10 15Leu Gly14018PRTArtificial SequenceSynthetic
IgG2/IgG1 hybrid with C220S deltaG 140Glu Arg Lys Cys Ser Val Glu
Cys Pro Pro Cys Pro Ala Pro Glu Leu1 5 10 15Leu
Gly14118PRTArtificial SequenceSynthetic IgG2/IgG1 hybrid with C219X
deltaGmisc_feature(4)..(4)Xaa is any amino acid, except cysteine
141Glu Arg Lys Xaa Cys Val Glu Cys Pro Pro Cys Pro Ala Pro Glu Leu1
5 10 15Leu Gly14218PRTArtificial SequenceSynthetic IgG2/IgG1 hybrid
with C220X deltaGmisc_feature(5)..(5)Xaa is any amino acid, except
cysteine 142Glu Arg Lys Cys Xaa Val Glu Cys Pro Pro Cys Pro Ala Pro
Glu Leu1 5 10 15Leu Gly14319PRTHomo
sapiensmisc_feature(1)..(19)Wildtype IgG2 with C terminal
Xmisc_feature(19)..(19)Xaa is any amino acid, except cysteine
143Glu Arg Lys Cys Cys Val Glu Cys Pro Pro Cys Pro Ala Pro Pro Val1
5 10 15Ala Gly Xaa14419PRTArtificial SequenceSynthetic IgG2 with
C219S with C terminal Xmisc_feature(19)..(19)Xaa is any amino acid,
except cysteine 144Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro
Ala Pro Pro Val1 5 10 15Ala Gly Xaa14519PRTArtificial
SequenceSynthetic IgG2 with C220S with C terminal
Xmisc_feature(19)..(19)Xaa is any amino acid, except cysteine
145Glu Arg Lys Cys Ser Val Glu Cys Pro Pro Cys Pro Ala Pro Pro Val1
5 10 15Ala Gly Xaa14619PRTArtificial SequenceSynthetic IgG2 with
C219X with C terminal Xmisc_feature(4)..(4)Xaa is any amino acid,
except cysteinemisc_feature(19)..(19)Xaa is any amino acid, except
cysteine 146Glu Arg Lys Xaa Cys Val Glu Cys Pro Pro Cys Pro Ala Pro
Pro Val1 5 10 15Ala Gly Xaa14719PRTArtificial SequenceSynthetic
IgG2 with C220X with C terminal Xmisc_feature(5)..(5)Xaa is any
amino acid, except cysteinemisc_feature(19)..(19)Xaa is any amino
acid, except cysteine 147Glu Arg Lys Cys Xaa Val Glu Cys Pro Pro
Cys Pro Ala Pro Pro Val1 5 10 15Ala Gly Xaa1484PRTArtificial
SequenceSynthetic IgG2 hinge portion 148Pro Val Ala
Gly11497PRTArtificial SequenceSynthetic IgG1 hinge portion 149Ser
Cys Asp Lys Thr His Thr1 51504PRTArtificial SequenceSynthetic IgG1
hinge portion 1 150Glu Leu Leu Gly11515PRTArtificial
SequenceSynthetic IgG1 hinge portion 2 151Glu Leu Leu Gly Gly1
5152326PRTArtificial SequenceSynthetic IgG2.3 V13 152Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr
Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln
Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Asp Ser Val Phe Leu Phe
Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro
Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser His Glu Asp Pro
Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val
His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser
Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185
190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro
195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro
Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu
Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys
Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn
Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu
Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val
Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser
Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310
315 320Ser Leu Ser Pro Gly Lys 325153326PRTArtificial
SequenceSynthetic IgG2.3 V14 153Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Pro Val Ala Gly Asp Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val
Val Asp 130 135 140Val Ser His Glu Asp Gly Glu Val Gln Phe Asn Trp
Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys
Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser
Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu
Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile
Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230
235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp
Ile 245
250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys
Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe Phe Leu
Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly
Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu His Asn
His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro Gly Lys
325154326PRTArtificial SequenceSynthetic IgG2.3 V15 154Ala Ser Thr
Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr
Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe
Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40
45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser
50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr Gln
Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr Lys
Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro Pro
Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Asp Ser Val Phe Leu Phe
Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg Thr Pro
Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser Asp Glu Asp Gly
Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val Glu Val
His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser
Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp 180 185
190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro
195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro
Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu
Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu Val Lys
Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu Ser Asn
Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu
Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val
Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295 300Ser
Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser Leu305 310
315 320Ser Leu Ser Pro Gly Lys 325155326PRTArtificial
SequenceSynthetic IgG2.3 V16 155Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Pro Val Ala Gly Asp Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val
Val Asp 130 135 140Val Ser His Glu Asp Gly Glu Val Gln Phe Asn Trp
Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys
Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser
Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu
Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Arg Pro Ile
Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230
235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp
Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn
Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe
Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln
Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu
His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro
Gly Lys 325156326PRTArtificial SequenceSynthetic IgG2.3 V17 156Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Asp Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Ser Asp Glu
Asp Gly Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170
175Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly
Leu Pro 195 200 205Arg Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 325157326PRTArtificial
SequenceSynthetic IgG2.3 V18 157Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Pro Val Ala Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys Asp
115 120 125Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val Val
Val Asp 130 135 140Val Glu His Glu Asp Pro Glu Val Gln Phe Asn Trp
Tyr Val Asp Gly145 150 155 160Val Glu Val His Asn Ala Lys Thr Lys
Pro Arg Glu Glu Gln Phe Asn 165 170 175Ser Thr Phe Arg Val Val Ser
Val Leu Thr Val Val His Gln Asp Trp 180 185 190Leu Asn Gly Lys Glu
Tyr Lys Cys Lys Val Ser Asn Lys Gly Leu Pro 195 200 205Ala Pro Ile
Glu Lys Thr Ile Ser Lys Thr Lys Gly Gln Pro Arg Glu 210 215 220Pro
Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys Asn225 230
235 240Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp
Ile 245 250 255Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn
Tyr Lys Thr 260 265 270Thr Pro Pro Met Leu Asp Ser Asp Gly Ser Phe
Phe Leu Tyr Ser Lys 275 280 285Leu Thr Val Asp Lys Ser Arg Trp Gln
Gln Gly Asn Val Phe Ser Cys 290 295 300Ser Val Met His Glu Ala Leu
His Asn His Tyr Thr Gln Lys Ser Leu305 310 315 320Ser Leu Ser Pro
Gly Lys 325158326PRTArtificial SequenceSynthetic IgG2.3 V19 158Ala
Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10
15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr
20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr
Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu
Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Pro Val Ala Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys Asp 115 120 125Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val Asp 130 135 140Val Glu His Glu
Asp Pro Glu Val Gln Phe Asn Trp Tyr Val Asp Gly145 150 155 160Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Phe Asn 165 170
175Ser Thr Phe Arg Val Val Ser Val Leu Thr Val Val His Gln Asp Trp
180 185 190Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys Gly
Phe Pro 195 200 205Ala Pro Ile Glu Lys Thr Ile Ser Lys Thr Lys Gly
Gln Pro Arg Glu 210 215 220Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu Met Thr Lys Asn225 230 235 240Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr Pro Ser Asp Ile 245 250 255Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys Thr 260 265 270Thr Pro Pro
Met Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser Lys 275 280 285Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser Cys 290 295
300Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser
Leu305 310 315 320Ser Leu Ser Pro Gly Lys 325159327PRTArtificial
SequenceSynthetic IgG2.3G1 159Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser Thr Ser Glu Ser Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro Val Thr Val
Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His Thr Phe Pro
Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser Ser Val Val
Thr Val Pro Ser Ser Asn Phe Gly Thr Gln Thr65 70 75 80Tyr Thr Cys
Asn Val Asp His Lys Pro Ser Asn Thr Lys Val Asp Lys 85 90 95Thr Val
Glu Arg Lys Ser Cys Val Glu Cys Pro Pro Cys Pro Ala Pro 100 105
110Glu Leu Leu Gly Gly Pro Ser Val Phe Leu Phe Pro Pro Lys Pro Lys
115 120 125Asp Thr Leu Met Ile Ser Arg Thr Pro Glu Val Thr Cys Val
Val Val 130 135 140Asp Val Ser His Glu Asp Pro Glu Val Lys Phe Asn
Trp Tyr Val Asp145 150 155 160Gly Val Glu Val His Asn Ala Lys Thr
Lys Pro Arg Glu Glu Gln Tyr 165 170 175Asn Ser Thr Tyr Arg Val Val
Ser Val Leu Thr Val Leu His Gln Asp 180 185 190Trp Leu Asn Gly Lys
Glu Tyr Lys Cys Lys Val Ser Asn Lys Ala Leu 195 200 205Pro Ala Pro
Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro Arg 210 215 220Glu
Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu Met Thr Lys225 230
235 240Asn Gln Val Ser Leu Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser
Asp 245 250 255Ile Ala Val Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn
Asn Tyr Lys 260 265 270Thr Thr Pro Pro Val Leu Asp Ser Asp Gly Ser
Phe Phe Leu Tyr Ser 275 280 285Lys Leu Thr Val Asp Lys Ser Arg Trp
Gln Gln Gly Asn Val Phe Ser 290 295 300Cys Ser Val Met His Glu Ala
Leu His Asn His Tyr Thr Gln Lys Ser305 310 315 320Leu Ser Leu Ser
Pro Gly Lys 325160327PRTArtificial SequenceSynthetic IgG2.3G1 V20
160Ala Ser Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1
5 10 15Ser Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp
Tyr 20 25 30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu
Thr Ser 35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly
Leu Tyr Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe
Gly Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser
Asn Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu
Cys Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Asp Ser
Val Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile
Ser Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser
His Glu Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155
160Gly Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr
165 170 175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His
Gln Asp 180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser
Asn Lys Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys
Ala Lys Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro
Pro Ser Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu
Thr Cys Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val
Glu Trp Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr
Thr Pro Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280
285Lys Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser
290 295 300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln
Lys Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325161327PRTArtificial SequenceSynthetic IgG2.3G1 V21 161Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly
Thr Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn
Thr Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys
Pro Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Asp Ser Val
Phe Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser
Arg Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser His
Glu Asp Gly Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly
Val Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325162327PRTArtificial SequenceSynthetic IgG2.3G1 V22 162Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Asp Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser Asp Glu
Asp Gly Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325163327PRTArtificial SequenceSynthetic IgG2.3G1 V23 163Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Asp Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser His Glu
Asp Gly Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Arg Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325164327PRTArtificial SequenceSynthetic IgG2.3G1 V24 164Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Asp Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser Asp Glu
Asp Gly Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Arg Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325165327PRTArtificial SequenceSynthetic IgG2.3G1 V25 165Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Asp Asp Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser Asp Glu
Asp Gly Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Arg Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325166327PRTArtificial SequenceSynthetic IgG2.3G1 V26 166Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Asp Leu Leu Gly Asp Asp Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Ser Asp Glu
Asp Gly Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Arg Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325167327PRTArtificial SequenceSynthetic IgG2.3G1 V27 167Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Glu His Glu
Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Leu 195 200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys
Gly Gln Pro Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser
Arg Glu Glu Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys
Leu Val Lys Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp
Glu Ser Asn Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro
Pro Val Leu Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys
Leu Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295
300Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys
Ser305 310 315 320Leu Ser Leu Ser Pro Gly Lys
325168327PRTArtificial SequenceSynthetic IgG2.3G1 V28 168Ala Ser
Thr Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Cys Ser Arg1 5 10 15Ser
Thr Ser Glu Ser Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25
30Phe Pro Glu Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser
35 40 45Gly Val His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr
Ser 50 55 60Leu Ser Ser Val Val Thr Val Pro Ser Ser Asn Phe Gly Thr
Gln Thr65 70 75 80Tyr Thr Cys Asn Val Asp His Lys Pro Ser Asn Thr
Lys Val Asp Lys 85 90 95Thr Val Glu Arg Lys Ser Cys Val Glu Cys Pro
Pro Cys Pro Ala Pro 100 105 110Glu Leu Leu Gly Gly Pro Ser Val Phe
Leu Phe Pro Pro Lys Pro Lys 115 120 125Asp Thr Leu Met Ile Ser Arg
Thr Pro Glu Val Thr Cys Val Val Val 130 135 140Asp Val Glu His Glu
Asp Pro Glu Val Lys Phe Asn Trp Tyr Val Asp145 150 155 160Gly Val
Glu Val His Asn Ala Lys Thr Lys Pro Arg Glu Glu Gln Tyr 165 170
175Asn Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu His Gln Asp
180 185 190Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn Lys
Ala Phe 195
200 205Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly Gln Pro
Arg 210 215 220Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg Glu Glu
Met Thr Lys225 230 235 240Asn Gln Val Ser Leu Thr Cys Leu Val Lys
Gly Phe Tyr Pro Ser Asp 245 250 255Ile Ala Val Glu Trp Glu Ser Asn
Gly Gln Pro Glu Asn Asn Tyr Lys 260 265 270Thr Thr Pro Pro Val Leu
Asp Ser Asp Gly Ser Phe Phe Leu Tyr Ser 275 280 285Lys Leu Thr Val
Asp Lys Ser Arg Trp Gln Gln Gly Asn Val Phe Ser 290 295 300Cys Ser
Val Met His Glu Ala Leu His Asn His Tyr Thr Gln Lys Ser305 310 315
320Leu Ser Leu Ser Pro Gly Lys 3251695PRTArtificial
SequenceSynthetic linker 169Pro Val Gly Val Val1 51704PRTArtificial
SequenceSynthetic IgG2 hinge portion 170Cys Cys Val Glu1
* * * * *
References