U.S. patent application number 16/785911 was filed with the patent office on 2021-01-28 for modified pseudomonas exotoxin a.
The applicant listed for this patent is Hoffmann-La Roche Inc., The United States of America, as represented by the Secretary, Department of Health and Human Servic, The United States of America, as represented by the Secretary, Department of Health and Human Servic. Invention is credited to Ulrich Brinkmann, Guy Georges, Sabine Imhof-Jung, Byungkook Lee, Ronit Mazor, Gerhard Niederfellne, Masanori Onda, Ira H. Pastan.
Application Number | 20210024648 16/785911 |
Document ID | / |
Family ID | 1000005138848 |
Filed Date | 2021-01-28 |
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United States Patent
Application |
20210024648 |
Kind Code |
A1 |
Pastan; Ira H. ; et
al. |
January 28, 2021 |
MODIFIED PSEUDOMONAS EXOTOXIN A
Abstract
The invention provides a Pseudomonas exotoxin A (PE) comprising
an amino acid sequence having a substitution of one or more B-cell
and/or T-cell epitopes. The invention further provides related
chimeric molecules, as well as related nucleic acids, recombinant
expression vectors, host cells, populations of cells, and
pharmaceutical compositions. Methods of treating or preventing
cancer in a mammal, methods of inhibiting the growth of a target
cell, methods of producing the PE, and methods of producing the
chimeric molecule are further provided by the invention.
Inventors: |
Pastan; Ira H.; (Potomac,
MD) ; Mazor; Ronit; (Rockville, MD) ; Onda;
Masanori; (Rockville, MD) ; Lee; Byungkook;
(Potomac, MD) ; Niederfellne; Gerhard;
(Oberhausen, DE) ; Imhof-Jung; Sabine; (Planegg,
DE) ; Brinkmann; Ulrich; (Weilheim, DE) ;
Georges; Guy; (Habach, DE) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
The United States of America, as represented by the Secretary,
Department of Health and Human Servic
Hoffmann-La Roche Inc. |
Bethesda
Little Falls |
MD
NJ |
US
US |
|
|
Family ID: |
1000005138848 |
Appl. No.: |
16/785911 |
Filed: |
February 10, 2020 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16429829 |
Jun 3, 2019 |
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16785911 |
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15191392 |
Jun 23, 2016 |
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16429829 |
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14505590 |
Oct 3, 2014 |
9388222 |
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15191392 |
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62052665 |
Sep 19, 2014 |
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61982051 |
Apr 21, 2014 |
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61908464 |
Nov 25, 2013 |
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61887418 |
Oct 6, 2013 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
C07K 16/1214 20130101;
C07K 14/21 20130101; A61K 47/6803 20170801; C07K 16/303 20130101;
C07K 2317/24 20130101; A61K 47/6851 20170801; C07K 2319/50
20130101; C07K 2317/55 20130101; C07K 2319/55 20130101; A61K
47/6871 20170801; C07K 2319/30 20130101; C07K 16/40 20130101; A61K
47/6859 20170801; C07K 2319/33 20130101; A61K 38/00 20130101; C07K
2317/73 20130101; C07K 2317/92 20130101; C07K 2317/624 20130101;
A61K 47/6829 20170801; A61K 39/39558 20130101; A61K 2039/505
20130101; A61K 31/337 20130101; C07K 16/30 20130101; C07K 2317/94
20130101 |
International
Class: |
C07K 16/30 20060101
C07K016/30; C07K 16/12 20060101 C07K016/12; A61K 47/68 20060101
A61K047/68; A61K 39/395 20060101 A61K039/395; A61K 31/337 20060101
A61K031/337; C07K 16/40 20060101 C07K016/40; C07K 14/21 20060101
C07K014/21 |
Claims
1-42. (canceled)
43. A humanized anti-mesothelin antibody or antigen binding
fragment thereof, comprising a variable heavy chain domain of SEQ
ID No. 45 and a variable light chain domain of SEQ ID No. 46.
44. A pharmaceutical composition, comprising the humanized
anti-mesothelin antibody according to claim 1 and a
pharmaceutically acceptable carrier.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a Continuation of U.S. patent
application Ser. No. 16/429,829, filed Jun. 3, 2019, which in turn
is a Continuation of U.S. patent application Ser. No. 15/191,392,
filed Jun. 23, 2016, which in turn is a Continuation of U.S. patent
application Ser. No. 14/505,590, filed Oct. 3, 2014, now U.S. Pat.
No. 9,388,222 B2, issued Jul. 12, 2016, which claims the benefit of
U.S. Provisional Patent Application Nos. 61/887,418, filed Oct. 6,
2013; 61/908,464, filed Nov. 25, 2013; 61/982,051, filed Apr. 21,
2014; and 62/052,665, filed Sep. 19, 2014. Each of prior mentioned
applications is hereby incorporated by reference herein in its
entirety.
INCORPORATION-BY-REFERENCE OF MATERIAL SUBMITTED ELECTRONICALLY
[0002] Incorporated by reference in its entirety herein is a
computer-readable nucleotide/amino acid sequence listing submitted
concurrently herewith and identified as follows: one 144,473 Byte
ASCII (Text) file named "718352 ST25.txt," dated Oct. 1, 2014.
BACKGROUND OF THE INVENTION
[0003] Pseudomonas exotoxin A (PE) is a bacterial toxin with
cytotoxic activity that may be effective for destroying or
inhibiting the growth of undesirable cells, e.g., cancer cells.
Accordingly, PE may be useful for treating or preventing diseases
such as, e.g., cancer. However, PE may be highly immunogenic.
Accordingly, PE administration may stimulate an anti-PE immune
response including, for example, the production of anti-PE
antibodies and/or T-cells, that undesirably neutralizes the
cytotoxic activity of PE. Such immunogenicity may reduce the amount
of PE that can be given to the patient which may, in turn, reduce
the effectiveness of the PE for treating the disease, e.g., cancer.
Thus, there is a need for improved PE.
[0004] Several deimmunized Pseudomonas exotoxins (PE) are known in
art. The domain II deleted versions (for example, PE24) may be less
immunogenic and may cause fewer side effects (such as, for example,
capillary leak syndrome and hepatotoxicity) as compared to PE38,
which contains domain II. Without being bound to a particular
theory, it is believed that the reduced immunogenicity and fewer
side effects of PE24 could, at least in part, be due to the reduced
size of PE24, which disadvantageously results in a shorter serum
half life. Different furin cleavable linkers may be employed in
PE24 variants. PE immunoconjugates have mostly used dsFv fragments
as targeting moieties. Such deimmunized Pseudomonas exotoxins (PE)
are described in, for example, International Patent Application
Publications WO2005052006, WO2007016150, WO2007014743,
WO2007031741, WO200932954, WO201132022, WO2012/154530, and WO
2012/170617.
[0005] Previous immunotoxins have many disadvantages. For example,
deimmunization of previous immuntoxins has been incomplete with
respect to the human B-cell epitopes because immunogenic reactions
still occurred. In addition, the deimmunization of previous
immunotoxins was accompanied by a reduced cytotoxic potency. For
example, a LO10 deimmunized PE variant described in WO 2012/170617
provided a loss of potency of at least 40% compared to wild type
(WT) PE and other PE variants. In International Patent Application
Publication WO2013/040141, Pseudomonas exotoxins with less
immunogenic B-cell epitopes have been described. In the PE variant
LRO10, all B-cell epitopes were removed. This, however, also led to
a reduction of cytotoxicity towards tumor cells.
[0006] In addition, fusion of a dsFv with domain II deleted
versions of PE (PE24) have a shorter serum half life due to their
reduced overall size as compared to dsFv fusions with PE38. The
linkers of previous immunoxins also contained T-cell epitopes and
poor developability such as, for example, a poor stability at
37.degree. C. In addition, previous anti-mesothelin (MSLN)
immunotoxins have only used mouse-derived dsFv fragments fused to
PE, which may further contribute to immunogenicity. International
Patent Application Publication WO 2012/154530 refers to Pseudomonas
exotoxin variant chimeric molecules with short flexible linkers
which improve the cytotoxicity towards tumor cells.
BRIEF SUMMARY OF THE INVENTION
[0007] The invention relates to deimmunized Pseudomonas exotoxins
and Fab fusions thereof (e.g., humanized anti-MSLN), methods for
the treatment of cancer, stabilized pharmaceutical formulations,
methods for the reduction of side effects and methods for enhancing
the serum half life and optimizing treatment schedule.
[0008] An embodiment of the invention provides a Pseudomonas
exotoxin A (PE) comprising a PE amino acid sequence, wherein one or
more of amino acid residues F443, R456, L477, R494, and L552 as
defined by reference to SEQ ID NO: 1 are, independently,
substituted, wherein the PE optionally has:
[0009] (i) a further substitution of one or more amino acid
residues within one or more B cell epitopes, and the further
substitution for an amino acid within one or more B-cell epitopes
is a substitution of, independently, one or more of amino acid
residues D403, D406, R412, R427, E431, R432, D461, R463, R467,
R490, R505, R513, E522, R538, E548, R551, R576, Q592, and L597 as
defined by reference to SEQ ID NO: 1,
[0010] (ii) a further substitution of one or more amino acid
residues within one or more T-cell epitopes,
[0011] (iii) a deletion of one or more continuous amino acid
residues of residues 1-273 and 285-394 as defined by SEQ ID NO: 1,
or
[0012] (iv) a combination of any one, two, or three of
(i)-(iii).
[0013] Another embodiment of the invention provides an isolated,
mutated Pseudomonas exotoxin A (PE), comprising a sequence of the
following formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0014] wherein:
[0015] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3,
[0016] R.sup.1=1 to 10 amino acid residues
[0017] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0018] R.sup.2=1 to 10 amino acid residues;
[0019] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO:1; and,
[0020] PE functional domain III=residues 395-613 of SEQ ID NO:1,
wherein one or more of amino acid residues F443, R456, L477, R494,
and L552 as defined by reference to SEQ ID NO: 1 are,
independently, substituted, wherein the PE optionally has:
[0021] (i) a further substitution of one or more amino acid
residues within one or more B cell epitopes, and the further
substitution for an amino acid within one or more B-cell epitopes
is a substitution of, independently, one or more of amino acid
residues D403, D406, R412, R427, E431, R432, D461, R463, R467,
R490, R505, R513, E522, R538, E548, R551, R576, Q592, and L597 as
defined by reference to SEQ ID NO: 1,
[0022] (ii) a further substitution of one or more amino acid
residues within one or more T-cell epitopes, or
[0023] (iii) both (i) and (ii).
[0024] Another embodiment of the invention provides an isolated,
mutated Pseudomonas exotoxin A (PE), comprising a sequence of the
following formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0025] wherein:
[0026] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3,
[0027] R.sup.1=1 to 10 amino acid residues
[0028] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0029] R.sup.2=1 to 10 amino acid residues;
[0030] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO:1; and,
[0031] PE functional domain III=residues 395-613 of SEQ ID NO:1,
wherein the PE includes an arginine at position 458, as defined by
reference to SEQ ID NO: 1, and
[0032] wherein the PE has:
[0033] (a) a substitution of alanine for amino acid residue
R427;
[0034] (b) a substitution of alanine for amino acid residue
R463;
[0035] (c) a substitution of alanine for amino acid residue
R467;
[0036] (d) a substitution of alanine for amino acid residue
R490;
[0037] (e) a substitution of alanine for amino acid residue R505;
and
[0038] (f) a substitution of alanine for amino acid residue
R538.
[0039] Additional embodiments of the invention provide related
chimeric molecules, as well as related nucleic acids, recombinant
expression vectors, host cells, populations of cells, and
pharmaceutical compositions.
[0040] Still another embodiment of the invention provides a method
of treating or preventing cancer in a mammal comprising
administering to the mammal the inventive PE, chimeric molecule,
nucleic acid, recombinant expression vector, host cell, population
of cells, or pharmaceutical composition, in an amount effective to
treat or prevent cancer in the mammal.
[0041] Another embodiment of the invention provides a method of
inhibiting the growth of a target cell comprising contacting the
cell with the inventive PE, chimeric molecule, nucleic acid,
recombinant expression vector, host cell, population of cells, or
pharmaceutical composition, in an amount effective to inhibit
growth of the target cell.
[0042] Additional embodiments of the invention provide methods of
producing the inventive PE and methods of producing the inventive
chimeric molecule.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
[0043] FIGS. 1A and 1B are T cell epitope heat maps showing the
strongest (>20%, black squares), medium (10-20%, dark grey
squares), weak (3%-10%, light grey squares) and negative (absence
of response; <3%, white squares) responses for naive donors
(n=50) (FIG. 1A) and previously treated patients (n=16) (FIG. 1B).
The responses are shown as a percentage of responsive spots for
each donor. Responses were clustered using automatic sorting based
on the responsiveness of the pools.
[0044] FIGS. 2A-2D are graphs showing the response of three donor
samples (FIGS. 2A-2C) and one HCL patient sample (FIG. 2D) to one
of 22 peptide pools, control pool (CEFT), or no peptide after
stimulation with HA22 (shaded bars) or LR-R494A (unshaded bars) as
measured in spot-forming cells (SFCs) per 10.times.10.sup.6 cells.
* indicates statistical significance between HA22 and LR-R494A
(p<0.01).
[0045] FIGS. 3A-3C are graphs showing the response of two donor
samples (FIGS. 3A-3B) and one HCL patient sample (FIG. 3C) to one
of 22 peptide pools, CEFT, or no peptide after stimulation with
HA22 (shaded bars) or LR-R505A (unshaded bars) as measured in SFCs
per 10.times.10.sup.6 cells. * indicates statistical significance
(p<0.01).
[0046] FIGS. 4A-4B are graphs showing the response of two donor
samples (FIGS. 4A-4B) to one of 22 peptide pools, CEFT, or no
peptide after stimulation with HA22 (shaded bars) or LR-R551A
(unshaded bars) as measured in SFCs per 10.times.10.sup.6 cells. *
indicates statistical significance in student T test
(p<0.01).
[0047] FIGS. 5A-5D are graphs showing the response of two donor
samples (FIGS. 5C-5D) and two mesothelioma patient samples (A-B)
after stimulation with recombinant immunotoxin (RIT) and
restimulation with peptide 93 or 94 with either the wild-type (WT)
amino acid sequence (black bars), L552N (dark grey bars), or L552E
(unshaded bars), or treatment with no peptide (light grey bars). *
indicates statistical significance in student T test
(p<0.05).
[0048] FIGS. 6A-6C are graphs showing the response of three donor
samples to 22 peptide pools after stimulation with either HA22-LR
(WT) (shaded bars) or LR-R427A (unshaded bars) and restimulation
with the appropriate peptides as measured in SFCs per
10.times.10.sup.6 cells. * indicates statistical significance
(p<0.05).
[0049] FIGS. 7A-7C are graphs showing the response of two patient
samples (FIGS. 7A-7B) and one donor (FIG. 7C) to one of pools 8-22
after stimulation with either HA22-LR (WT) (shaded bars) or
LR-F443A (unshaded bars) and restimulation with the appropriate
peptides as measured in SFCs per 10.times.10.sup.6 cells. *
indicates statistical significance (p<0.05).
[0050] FIG. 8 is a graph showing the fold change in EC50 of
HA22-LR-GGS (circles), HA22 (vertical dashes), or HA22-LR-T18
(triangles) at various temperatures.
[0051] FIGS. 9A-9D are graphs showing the response of four donor
samples after stimulation with RIT and restimulation with no
peptide, WT peptide 67, or peptide 67 with either a valine or
alanine substitution at position 471 as measured in SFCs per
10.times.10.sup.6 cells.
[0052] FIGS. 10A-10E are graphs showing the response of three donor
samples (FIGS. 10A-10C), an HCL patient sample (FIG. 10D), and a
mesothelioma patient sample (FIG. 10E) after stimulation with
peptide 67 or 68 that contains an alanine mutation (white bars) or
histidine mutation (grey bars) at position 477 or no mutation (WT)
(black bars).
[0053] FIGS. 11A and 11B are graphs showing the response of samples
from a meothelioma patient (FIG. 11A) and a hairy cell leukemia
(HCL) patient (FIG. 11B) after stimulation with RIT and
restimulation with no peptide, peptide 93, 94 or 95 with either the
WT amino acid sequence (shaded bars) or L556V (unshaded bars).
[0054] FIG. 12 is a graph showing the aggregation (% Area) of HMW
cFP-0170 (Fab-LO10R-456A short linker; diagonally striped bars) or
HMW cFP-0171 (Fab-LO10R-456A elongated liker; horizontally striped
bars) as measured by size exclusion chromatograph (SEC) after
incubation at 33.degree. C.
[0055] FIG. 13 is a graph showing the aggregation (% Area) of HMW
cFP-0170 (Fab-LO10R-456A short linker; diamonds) or HMW cFP-0171
(Fab-LO10R-456A elongated liker; squares) as measured by size
exclusion chromatograph (SEC) after incubation at 33.degree. C.
[0056] FIG. 14 is a graph showing the aggregation (radius in nm) of
cFP-0166 (Fab-LO10R short linker; diamonds) or cFP-0174 (Fab-LO10R
elongated linker; circles) as measured by dynamic light scattering
(DLS) at various temperatures in a range from 25.degree. C. to
50.degree. C.
[0057] FIG. 15 is a graph showing the aggregation (radius in nm) of
cFP-0170 (Fab-LO10R-456A short linker; diamonds) or cFP-0171
(Fab-LO10R-456A elongated linker; circles) as measured by DLS at
various temperatures in a range from 25.degree. C. to 50.degree.
C.
[0058] FIG. 16 is a graph showing the aggregation (radius in nm) of
cFP-0172 (Fab-LO10R-456A-551A short linker; diamonds) or cFP-0173
(Fab-LO10R-456A-551A elongated linker; circles) as measured by DLS
at various temperatures in a range from 25.degree. C. to 50.degree.
C.
[0059] FIG. 17 is a graph showing the response of patient sera
clone 9H3 to (10.sup.7) or (10.sup.8) phages/well or (10.sup.7) or
(10.sup.8) phages/well with antigen pre-incubation incubated with
huSS1Fab-PE24LRO10 (with 458A mutation) (left diagonally striped
bars), huSS1Fab-PE24LRO10R (with 458R backmutation) (horizontally
striped bars), or huSS1Fab-PE24LRO10R-456A (with 458R backmutation
and 456A mutation) (right diagonally striped bars) as measured in
optical density at 450 nm.
[0060] FIGS. 18A and 18B are graphs showing the antigenicity of the
chimeric molecules SS1P (T1), SS1-dsFv-LR-LO10R (T2),
SS1-dsFv-LR-LO10R456A (T3), SS1-FABLO10R (Roche 116, T4),
SS1-FABLO10R456ALongLinker (Roche 171, T5), and
SS1-FABLO10RLongLinker (Roche 174, T6) with respect to 20 patient
sera. Two representative examples (FIGS. 18A and 18B) are shown.
The Y axis is relative IC50(%).
[0061] FIG. 19 is a graph showing plasma concentration (ng/ml) of
chimeric molecules SS1P38 (0.4 mg/kg (diamonds)), SS1P38 (0.2 mg/kg
(squares)), Fab-PE24 (0.231 mg/kg (triangles)), (dsFv-PE24 (0.16
mg/kg (x)) administered to mice over a period of time (hours
(h)).
[0062] FIG. 20 is a graph showing the serum half life cFP (ng/ml)
of 0.3 mg/kg cFP_0205 (squares), 0.3 mg/kg SS1P (circles), or 0.3
mg/kg cFP_0205 (dashed lines) over time (hours) in cyno
monkeys.
[0063] FIG. 21 is a graph showing the body weight change of of mice
treated with control (vehicle; circles); cFP 0205 3 mg/kg i.v. 3q7d
(squares on solid line); cFP 0205 2 mg/kg i.v. 3q7d (squares on
larger dashed line); cFP 0205 1 mg/kg i.v. 3q7d (squares on short
dashed line); cFP 0205 0.5 mg/kg i.v. 3q7d (squares on dotted line)
over time (days after cell inoculation).
[0064] FIGS. 22A-22F are fluorescence images of sections of lung
(FIGS. 22A-22B), spleen (FIGS. 22C-22D) or liver (FIGS. 22E-22F) of
mice treated with labeled cFP0205 at 10.times. (FIGS. 22A, 22C,
22E) or 40.times. (FIGS. 22B, 22D, 22F) magnification.
[0065] FIGS. 22G-22L are fluorescence images of sections of lung
(FIGS. 22G-22H), spleen (FIGS. 22I-22J) or liver (FIGS. 22K-22L) of
mice treated with labeled SS1P at 10.times. (FIGS. 22G, 22I, 22K)
or 40.times. (FIGS. 22H, 22J, 22L) magnification.
[0066] FIG. 23 is a graph showing the tumor size of mice that were
untreated (open diamonds) or treated with paclitaxel alone, (grey
diamonds) RG7787 (also referred to as R205 or cFP 0205) alone
(black diamonds), or a combination of RG7787 and paclitaxel (black
and white diamonds) over time measured in days.
[0067] FIG. 24 is a graph showing the tumor size of mice that were
untreated (vehicle) (circles) or treated with RG7787 (squares) over
time measured in days. Each data point represents the average of
mean tumor volume for n=9 animals treated with RG7787 and n=8
control animals. Error bars show standard deviations.
[0068] FIG. 25 is a graph showing the tumor size of mice that were
treated with vehicle (control) (circles), RG7787 alone (squares),
paclitaxel alone (triangles), or a combination of RG7787 and
paclitaxel (diamonds) over time measured in days. Error bars show
standard deviations.
[0069] FIG. 26 is a graph showing the tumor size of untreated (UT)
(x) mice or mice treated with R205 alone (diamonds), a combination
of R205 and taxol (squares), or taxol alone (triangles) over time
measured in days.
[0070] FIG. 27A is a graph showing cell viability (%) of
CD22-expressing cell lines treated with various concentrations of
T18 or MP RIT (ng/ml).
[0071] FIG. 27B is a graph showing the relative cytotoxic activity
(%) of T18 or MP RIT that had been heated to one of various
temperatures (.degree. C.).
[0072] FIGS. 27C-27D are graphs showing the cytotoxic activity
(IC50 (ng/ml)) of MP or T18 RIT on cells from hairy cell leukemia
(HCL) (FIG. 27C) or chronic lymphocytic leukemia (CLL) (FIG. 27D)
patients.
[0073] FIG. 27E is a graph showing the effect of LMB-T18 on tumor
size in a xenograft mouse model after four injections of 5 mg/kg
(squares) of LMB-T18, three injections of 7.5 mg/kg (triangles) OF
LMB-T18, or PBS-0.2% human serum albumin (circles). Arrows
represent days of injection for all dose groups. Broken arrow
indicates additional injection of 5 mg/ml group. (*) P>0.01 in
one-way ANOVA. Error bars indicate SD.
[0074] FIG. 27F is a graph showing the % binding of MP, HA22-LR,
and LMB-T18 to serum from patients with neutralizing antibodies to
MP.
DETAILED DESCRIPTION OF THE INVENTION
[0075] Pseudomonas exotoxin A ("PE") is a bacterial toxin
(molecular weight 66 kD) secreted by Pseudomonas aeruginosa. The
native, wild-type PE sequence (SEQ ID NO: 1) is set forth in U.S.
Pat. No. 5,602,095, which is incorporated herein by reference.
Native, wild-type PE includes three structural domains that
contribute to cytotoxicity. Domain Ia (amino acids 1-252) mediates
cell binding, domain II (amino acids 253-364) mediates
translocation into the cytosol, and domain III (amino acids
400-613) mediates ADP ribosylation of elongation factor 2. While
the structural boundary of domain III of PE is considered to start
at residue 400, it is contemplated that domain III may require a
segment of domain Ib to retain ADP-ribosylating activity.
Accordingly, functional domain III is defined as residues 395-613
of PE. The function of domain Ib (amino acids 365-399) remains
undefined. Without being bound by a particular theory or mechanism,
it is believed that the cytotoxic activity of PE occurs through the
inhibition of protein synthesis in eukaryotic cells, e.g., by the
inactivation of the ADP-ribosylation of elongation factor 2
(EF-2).
[0076] Substitutions of PE are defined herein by reference to the
amino acid sequence of PE. Thus, substitutions of PE are described
herein by reference to the amino acid residue present at a
particular position, followed by the amino acid with which that
residue has been replaced in the particular substitution under
discussion. In this regard, the positions of the amino acid
sequence of a particular embodiment of a PE are referred to herein
as the positions of the amino acid sequence of the particular
embodiment or as the positions as defined by SEQ ID NO: 1. When the
positions are as defined by SEQ ID NO: 1, then the actual positions
of the amino acid sequence of a particular embodiment of a PE are
defined relative to the corresponding positions of SEQ ID NO: 1 and
may represent different residue position numbers than the residue
position numbers of SEQ ID NO: 1. Thus, for example, substitutions
refer to a replacement of an amino acid residue in the amino acid
sequence of a particular embodiment of a PE corresponding to the
indicated position of the 613-amino acid sequence of SEQ ID NO: 1
with the understanding that the actual positions in the respective
amino acid sequences may be different. For example, when the
positions are as defined by SEQ ID NO: 1, the term "R490" refers to
the arginine normally present at position 490 of SEQ ID NO: 1,
"R490A" indicates that the arginine normally present at position
490 of SEQ ID NO: 1 is replaced by an alanine, while "K590Q"
indicates that the lysine normally present at position 590 of SEQ
ID NO: 1 has been replaced with a glutamine. In the event of
multiple substitutions at two or more positions, the two or more
substitutions may be the same or different, i.e., each amino acid
residue of the two or more amino acid residues being substituted
can be substituted with the same or different amino acid residue
unless explicitly indicated otherwise.
[0077] The terms "Pseudomonas exotoxin" and "PE" as used herein
include PE that has been modified from the native protein to reduce
or to eliminate immunogenicity. Such modifications may include, but
are not limited to, elimination of domain Ia, various amino acid
deletions in domains Ib, II, and III, single amino acid
substitutions and the addition of one or more sequences at the
carboxyl terminus such as DEL and REDL (SEQ ID NO: 7). See Siegall
et al., J. Biol. Chem., 264: 14256-14261 (1989). Such modified PEs
may be further modified to include any of the inventive
substitution(s) for one or more amino acid residues within one or
more T-cell and/or B-cell epitopes described herein. In an
embodiment, the modified PE may be a cytotoxic fragment of native,
wild-type PE. Cytotoxic fragments of PE may include those which are
cytotoxic with or without subsequent proteolytic or other
processing in the target cell (e.g., as a protein or pre-protein).
In a preferred embodiment, the cytotoxic fragment of PE retains at
least about 20%, preferably at least about 40%, more preferably at
least about 50%, even more preferably at least about 75%, more
preferably at least about 90%, and still more preferably at least
about 95% of the cytotoxicity of native PE. In particularly
preferred embodiments, the cytotoxic fragment has at least the
cytotoxicity of native PE, and preferably has increased
cytotoxicity as compared to native PE.
[0078] Modified PE that reduces or eliminates immunogenicity
includes, for example, PE4E, PE40, PE38, PE25, PE38QQR, PE38KDEL,
and PE35. In an embodiment, the PE may be any of PE4E, PE40, PE38,
PE25, PE38QQR (in which PE38 has the sequence QQR added at the
C-terminus), PE38KDEL (in which PE38 has the sequence KDEL (SEQ ID
NO: 5) added at the C-terminus), PE-LR (resistance to lysosomal
degradation)(also referred to as PE24), PE24-LO10, and PE35.
[0079] In an embodiment, the PE has been modified to reduce
immunogenicity by deleting domain Ia as described in in U.S. Pat.
No. 4,892,827, which is incorporated herein by reference. The PE
may also be modified by substituting certain residues of domain Ia.
In an embodiment, the PE may be PE4E, which is a substituted PE in
which domain Ia is present but in which the basic residues of
domain Ia at positions 57, 246, 247, and 249 are replaced with
acidic residues (e.g., glutamic acid), as disclosed in U.S. Pat.
No. 5,512,658, which is incorporated herein by reference.
[0080] PE40 is a truncated derivative of PE (Pai et al., Proc.
Nat'l Acad. Sci. USA, 88: 3358-62 (1991) and Kondo et al., Biol.
Chem., 263: 9470-9475 (1988)). PE35 is a 35 kD carboxyl-terminal
fragment of PE in which amino acid residues 1-279 have been deleted
and the molecule commences with a Met at position 280 followed by
amino acids 281-364 and 381-613 of native PE. PE35 and PE40 are
disclosed, for example, in U.S. Pat. Nos. 5,602,095 and 4,892,827,
each of which is incorporated herein by reference. PE25 contains
the 11-residue fragment from domain II and all of domain III. In
some embodiments, the PE contains only domain III.
[0081] In a preferred embodiment, the PE is PE38. PE38 contains the
translocating and ADP ribosylating domains of PE but not the
cell-binding portion (Hwang J. et al., Cell, 48: 129-136 (1987)).
PE38 is a truncated PE pro-protein composed of amino acids 253-364
and 381-613 which is activated to its cytotoxic form upon
processing within a cell (see e.g., U.S. Pat. No. 5,608,039, which
is incorporated herein by reference, and Pastan et al., Biochim.
Biophys. Acta, 1333: C1-C6 (1997)).
[0082] In another preferred embodiment, the PE is PE-LR. PE-LR
contains a deletion of domain II except for a furin cleavage
sequence (FCS) corresponding to amino acid residues 274-284 of SEQ
ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a deletion of amino acid
residues 365-394 of domain Ib. Thus, PE-LR contains amino acid
residues 274-284 and 395-613 of SEQ ID NO: 1. PE-LR is described in
International Patent Application Publication WO 2009/032954, which
is incorporated herein by reference. The PE-LR may, optionally,
additionally comprise a GGS (SEQ ID NO: 283) linking peptide
between the FCS and amino acid residues 395-613 of SEQ ID NO:
1.
[0083] As noted above, alternatively or additionally, some or all
of domain Ib may be deleted with the remaining portions joined by a
bridge or directly by a peptide bond. Alternatively or
additionally, some of the amino portion of domain II may be
deleted. Alternatively or additionally, the C-terminal end may
contain the native sequence of residues 609-613 (REDLK) (SEQ ID NO:
6), or may contain a variation that may maintain the ability of the
PE to translocate into the cytosol, such as KDEL (SEQ ID NO: 5) or
REDL (SEQ ID NO: 7), and repeats of these sequences. See, e.g.,
U.S. Pat. Nos. 5,854,044; 5,821,238; and 5,602,095 and
International Patent Application Publication WO 1999/051643, which
are incorporated herein by reference. Any form of PE in which
immunogenicity has been eliminated or reduced can be used in
combination with any of the inventive substitution(s) for one or
more amino acid residues within one or more T-cell and/or B-cell
epitopes described herein so long as it remains capable of
cytotoxicity to targeted cells, e.g., by translocation and EF-2
ribosylation in a targeted cell.
[0084] An embodiment of the invention provides a Pseudomonas
exotoxin A (PE) comprising a PE amino acid sequence wherein one or
more of amino acid residues F443, R456, L477, R494, and L552 as
defined by reference to SEQ ID NO: 1 are, independently,
substituted, wherein the PE optionally has:
[0085] (i) a further substitution of one or more amino acid
residues within one or more B cell epitopes, and the further
substitution for an amino acid within one or more B-cell epitopes
is a substitution of, independently, one or more of amino acid
residues D403, D406, R412, R427, E431, R432, D461, R463, R467,
R490, R505, R513, E522, R538, E548, R551, R576, Q592, and L597 as
defined by reference to SEQ ID NO: 1,
[0086] (ii) a further substitution of one or more amino acid
residues within one or more T-cell epitopes,
[0087] (iii) a deletion of one or more continuous amino acid
residues of residues 1-273 and 285-394 as defined by SEQ ID NO: 1,
or
[0088] (iv) a combination of any one, two, or three of
(i)-(iii).
[0089] It has been discovered that amino acid residues F443, L477,
R494, and L552 are located within one or more T-cell epitopes of
PE. Thus, a substitution of one or more of amino acid residues
F443, L477, R494, and L552 may, advantageously, remove one or more
T cell epitope(s). Accordingly, the inventive PEs may,
advantageously, be less immunogenic than an unsubstituted (e.g.,
wild-type) PE.
[0090] A preferred embodiment of the invention provides an
isolated, mutated Pseudomonas exotoxin A (PE), comprising a
sequence of the following formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0091] wherein:
[0092] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3
[0093] R.sup.1=1 to 10 amino acid residues
[0094] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0095] R.sup.2=1 to 10 amino acid residues;
[0096] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0097] PE functional domain III=residues 395-613 of SEQ ID NO:
1,
[0098] wherein one or more of amino acid residues F443, L477, R494,
and L552 as defined by reference to SEQ ID NO: 1 are, independently
substituted;
[0099] and the PE comprises optionally a further substitution of an
amino acid within one or more B-cell epitopes.
[0100] The substitution of one or more of amino acid residues F443,
L477, R494, and L552 may be a substitution of any amino acid
residue for one or more of amino acid residues F443, L477, R494,
and L552. In an embodiment of the invention, the substitution of
one or more of amino acid residues F443, L477, R494, and L552 is a
substitution of, independently, alanine, glutamic acid, histidine,
or asparagine in place of one or more of amino acid residues F443,
L477, R494, and L552. In an embodiment of the invention, the
substitution of L552 is a substitution of glutamic acid or
asparagine in place of L552 and the substitution of L477 is a
substitution of histidine in place of L477.
[0101] In an embodiment of the invention, the substitution of one
or more of amino acid residues F443, L477, R494, and L552 is a
substitution of alanine in place of amino acid residue F443; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of glutamic acid or asparagine in place of amino acid
residue L552.
[0102] In addition to the substitution(s) for one or more amino
acid residues within one or more PE T-cell epitopes described
herein, the inventive PE may, optionally, also include additional
substitution(s) for one or more amino acid residues within one or
more B-cell epitopes of SEQ ID NO: 1. In this regard, in an
embodiment of the invention, the PE has a substitution of one or
more amino acids within one or more B-cell epitopes of SEQ ID NO:
1. In a preferred embodiment of the invention, the substitution of
one or more amino acid residues within one or more B-cell epitopes
of SEQ ID NO: 1 includes a substitution of alanine, glycine,
serine, or glutamine for one or more amino acids within one or more
B-cell epitopes of SEQ ID NO: 1. The substitution(s) within one or
more B-cell epitopes may, advantageously, further reduce
immunogenicity by the removal of one or more B-cell epitopes. The
substitution(s) may be located within any suitable PE B-cell
epitope. Exemplary B-cell epitopes are disclosed in, for example,
International Patent Application Publications WO 2007/016150, WO
2009/032954, and WO 2011/032022, each of which is incorporated
herein by reference. In a preferred embodiment, the substitution of
one or more amino acids within one or more B-cell epitopes of SEQ
ID NO: 1 is a substitution of alanine, glycine, serine, or
glutamine, independently, in place of one or more of amino acid
residues E282, E285, P290, R313, N314, P319, D324, E327, E331,
Q332, D403, D406, R412, R427, E431, R432, D461, D463, R467, Y481,
R490, R505, R513, L516, E522, R538, E548, R551, R576, K590, Q592,
and L597, wherein the amino acid residues E282, E285, P290, R313,
N314, P319, D324, E327, E331, Q332, D403, D406, R412, R427, E431,
R432, D461, D463, R467, Y481, R490, R505, R513, L516, E522, R538,
E548, R551, R576, K590, Q592, and L597 are defined by reference to
SEQ ID NO: 1.
[0103] In an embodiment of the invention, the further substitution
of an amino acid within one or more B-cell epitopes is a
substitution of, independently, alanine, glycine, serine, or
glutamine in place of one or more of amino acid residues E282,
E285, P290, R313, N314, P319, D324, E327, E331, Q332, D403, D406,
R412, R427, E431, R432, D461, R463, R467, R490, R505, R513, E522,
R538, E548, R551, R576, K590, Q592, and L597, as defined by
reference to SEQ ID NO: 1. Preferably, the further substitution of
an amino acid within one or more B-cell epitopes is a substitution
of, independently, alanine, glycine, or serine in place of one or
more of amino acid residues R427, R505, and R551. In an especially
preferred embodiment, the substitution of one or more of amino acid
residues F443, R456, L477, R494, and L552 is a substitution of
alanine in place of amino acid residue F443, a substitution of
histidine in place of L477, a substitution of alanine in place of
R494, and a substitution of glutamic acid in place of L552, and the
further substitution of an amino acid within one or more B-cell
epitopes is: (a) a substitution of alanine for amino acid residue
R427; and (b) a substitution of alanine for amino acid residue
R505, as defined by reference to SEQ ID NO: 1.
[0104] In an embodiment of the invention, any of the PEs described
herein may have an arginine at position 458, with reference to SEQ
ID NO: 1. Without being bound to a particular theory or mechanism,
it is believed that an arginine at position 458 provides enhanced
cytotoxicity.
[0105] In an embodiment of the invention, the PE has an arginine
residue at position 458, as defined by reference to SEQ ID NO: 1.
In a preferred embodiment, the substitution of one or more of amino
acid residues F443, R456, L477, R494, and L552 is a substitution of
alanine in place of amino acid residue R456, the PE has an arginine
residue at position 458, and the further substitution of an amino
acid within one or more B-cell epitopes is: (a) a substitution of
alanine for amino acid residue R427; (b) a substitution of alanine
for amino acid residue R463; (c) a substitution of alanine for
amino acid residue R467; (d) a substitution of alanine for amino
acid residue R490; and (e) a substitution of alanine for amino acid
residue R505; (f) a substitution of alanine for amino acid residue
R538; as defined by reference to SEQ ID NO: 1.
[0106] In an embodiment of the invention, the substitution of one
or more of amino acid residues F443, R456, L477, R494, and L552 is
a substitution of alanine in place of amino acid residue F443; a
substitution of alanine in place of amino acid residue R456; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of glutamic acid in place of amino acid residue L552,
the PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R463; (c) a
substitution of alanine for amino acid residue R467; (d) a
substitution of alanine for amino acid residue R490; (e) a
substitution of alanine for amino acid residue R505; and (f) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1.
[0107] In an embodiment of the invention, the substitution of one
or more of amino acid residues F443, R456, L477, R494, and L552 is
a substitution of alanine in place of amino acid residue R456, the
PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R463; (c) a
substitution of alanine for amino acid residue R467; (d) a
substitution of alanine for amino acid residue R490; (e) a
substitution of alanine for amino acid residue R505; and (f) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1.
[0108] In another embodiment of the invention, the substitution of
one or more of amino acid residues F443, R456, L477, R494, and L552
is a substitution of alanine in place of amino acid residue F443; a
substitution of alanine in place of amino acid residue R456; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of asparagine in place of amino acid residue L552, the
PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R463; (c) a
substitution of alanine for amino acid residue R467; (d) a
substitution of alanine for amino acid residue R490; (e) a
substitution of alanine for amino acid residue R505; and (f) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1.
[0109] In a preferred embodiment of the invention, the substitution
of one or more of amino acid residues F443, L477, R494, and L552 is
a substitution of alanine in place of amino acid residue F443; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of glutamic acid in place of amino acid residue L552,
the PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R456; (c) a
substitution of alanine for amino acid residue R463; (d) a
substitution of alanine for amino acid residue R467; (e) a
substitution of alanine for amino acid residue R490; (f) a
substitution of alanine for amino acid residue R505; and (g) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. A preferred embodiment is a PE
comprising SEQ ID NO: 285 (T14-LO10R+456A).
[0110] In a preferred embodiment of the invention, the substitution
of one or more of amino acid residues F443, L477, R494, and L552 is
a substitution of alanine in place of amino acid residue F443; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of asparagine in place of amino acid residue L552, the
PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R456; (c) a
substitution of alanine for amino acid residue R463; (d) a
substitution of alanine for amino acid residue R467; (e) a
substitution of alanine for amino acid residue R490; (f) a
substitution of alanine for amino acid residue R505; and (g) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. A preferred embodiment is a PE
comprising SEQ ID NO: 286 (T15-LO10R+456A).
[0111] In a preferred embodiment of the invention, the substitution
of one or more of amino acid residues F443, L477, R494, and L552 is
a substitution of alanine in place of amino acid residue F443; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of glutamic acid in place of amino acid residue L552,
the PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R463; (c) a
substitution of alanine for amino acid residue R467; (d) a
substitution of alanine for amino acid residue R490; (e) a
substitution of alanine for amino acid residue R505; and (1) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. A preferred embodiment is a PE
comprising SEQ ID NO: 287 (T14-LO10R).
[0112] In a preferred embodiment of the invention, the substitution
of one or more of amino acid residues F443, L477, R494, and L552 is
a substitution of alanine in place of amino acid residue F443; a
substitution of histidine in place of amino acid residue L477; a
substitution of alanine in place of amino acid residue R494; and a
substitution of asparagine in place of amino acid residue L552, the
PE has an arginine residue at position 458, and the further
substitution of an amino acid within one or more B-cell epitopes
is: (a) a substitution of alanine for amino acid residue R427; (b)
a substitution of alanine for amino acid residue R463; (c) a
substitution of alanine for amino acid residue R467; (d) a
substitution of alanine for amino acid residue R490; (e) a
substitution of alanine for amino acid residue R505; and (f) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. A preferred embodiment is a PE
comprising SEQ ID NO: 288 (T15-LO10R).
[0113] In a preferred embodiment, the FCS is a furin cleavage
sequence (FCS) corresponding to amino acid residues 274-284 of SEQ
ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)).
[0114] In a preferred embodiment,
[0115] n=1 for R.sup.1 and R.sup.2,
[0116] R.sup.1=a linker of the amino acid sequence of SEQ ID NO:
282 (DKTHKASGG),
[0117] R.sup.2=a linker of the amino acid sequence of SEQ ID NO:
284 (GGGGGS), and
[0118] FCS=furin cleavage sequence (FCS) corresponding to amino
acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)).
In an especially preferred embodiment, n is 0 for R.sup.3.
[0119] In an embodiment of the invention, the PE has the further
substitution of an amino acid within one or more T-cell epitopes.
In this regard, the PE may comprise an amino acid sequence having a
further substitution of any amino acid in place of one or more
amino acid residues at positions R421, L422, L423, A425, R427,
L429, Y439, H440, F443, L444, A446, A447, I450, 463-519, R551,
L552, T554, I555, L556, and W558 as defined by reference to SEQ ID
NO: 1. In an embodiment of the invention, the further substitution
of any amino acid in place of one or more amino acid residues at
positions R421, L422, L423, A425, R427, L429, Y439, H440, F443,
L444, A446, A447, I450, 463-519, R551, L552, T554, I555, L556, and
W558 is a substitution of one or more amino acid residues at
positions R421, L422, L423, A425, R427, L429, Y439, H440, F443,
L444, A446, A447, I450, Y470, I471, A472, P475, A476, L477, I493,
R494, N495, L498, L499, R500, V501, Y502, V503, R505, L508, P509,
R551, L552, T554, I555, L556, and W558.
[0120] The substitution of one or more amino acid residues at
positions R421, L422, L423, A425, R427, L429, Y439, H440, F443,
L444, A446, A447, I450, 463-519, R551, L552, T554, I555, L556, and
W558 of SEQ ID NO: 1 may be a substitution of any amino acid
residue in place of an amino acid residue at any one or more of
positions R421, L422, L423, A425, R427, L429, Y439, H440, F443,
L444, A446, A447, I450, 463-519, R551, L552, T554, I555, L556, and
W558 of SEQ ID NO: 1. The substitution of one or more amino acid
residues at positions R421, L422, L423, A425, R427, L429, Y439,
H440, F443, L444, A446, A447, I450, 463-519, R551, L552, T554,
I555, L556, and W558 of SEQ ID NO: 1 may include, e.g., a
substitution of alanine, glycine, serine, or glutamine in place of
one or more amino acid residues at position 421, 422, 423, 425,
427, 429, 439, 440, 443, 444, 446, 447, 450, 463, 464, 465, 466,
467, 468, 469, 470, 471, 472, 473, 474, 475, 476, 477, 478, 479,
480, 481, 482, 483, 484, 485, 486, 487, 488, 489, 490, 491, 492,
493, 494, 495, 496, 497, 498, 499, 500, 501, 502, 503, 504, 505,
506, 507, 508, 509, 510, 511, 512, 513, 514, 515, 516, 517, 518,
519, 551, 552, 554, 555, 556, and 558 of SEQ ID NO: 1. In a
preferred embodiment, the substitution of one or more amino acid
residues at positions R421, L422, L423, A425, R427, L429, Y439,
H440, F443, L444, A446, A447, I450, 463-519, R551, L552, T554,
I555, L556, and W558 of SEQ ID NO: 1 is a substitution of alanine,
glycine, serine, or glutamine in place of one or more of amino acid
residues R421, L422, L423, A425, R427, L429, Y439, H440, F443,
L444, A446, A447, I450, Y470, I471, A472, P475, A476, L477, I493,
R494, N495, L498, L499, R500, V501, Y502, V503, R505, L508, P509,
R551, L552, T554, I555, L556, and W558. One or more substitutions
in one or more T cell epitopes located at positions R421, L422,
L423, A425, R427, L429, Y439, H440, F443, L444, A446, A447, I450,
463-519, R551, L552, T554, I555, L556, and W558 of PE as defined by
reference to SEQ ID NO: 1 may further reduce immunogenicity of PE.
In an embodiment, the amino acid sequence does not have a
substitution of one or more amino acid residues at positions 427,
467, 485, 490, 505, 513, 516, and 551.
[0121] Preferably, the PE comprises one or more substitutions that
increase cytoxicity as disclosed, for example, in International
Patent Application Publication WO 2007/016150, which is
incorporated herein by reference. In this regard, an embodiment of
the invention provides PE with a substitution of an amino acid
within one or more B-cell epitopes of SEQ ID NO: 1 and the
substitution of an amino acid within one or more B-cell epitopes of
SEQ ID NO: 1 is a substitution of valine, leucine, or isoleucine in
place of amino acid residue R490, wherein the amino acid residue
R490 is defined by reference to SEQ ID NO: 1. In an embodiment of
the invention, substitution of one or more amino acid residues at
positions 313, 327, 331, 332, 431, 432, 505, 516, 538, and 590
defined by reference to SEQ ID NO: 1 with alanine or glutamine may
provide a PE with an increased cytotoxicity as disclosed, for
example, in International Patent Application Publication WO
2007/016150, which is incorporated herein by reference. Increased
cytotoxic activity and decreased immunogenicity can occur
simultaneously, and are not mutually exclusive. Substitutions that
both increase cytotoxic activity and decrease immunogenicity, such
as substitutions of R490 to glycine or, more preferably, alanine,
are especially preferred.
[0122] In an embodiment of the invention, another embodiment of the
invention provides an isolated, mutated Pseudomonas exotoxin A
(PE), comprising a sequence of the following formula:
R.sup.1.sub.nFCS R.sup.2.sub.nR.sup.3.sub.n-PE functional domain
III
[0123] wherein:
[0124] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3,
[0125] R.sup.1=1 to 10 amino acid residues
[0126] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0127] R.sup.2=1 to 10 amino acid residues;
[0128] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0129] PE functional domain III=residues 395-613 of SEQ ID NO:1,
wherein one or more of amino acid residues F443, R456, L477, R494,
and L552 as defined by reference to SEQ ID NO: 1 are,
independently, substituted, wherein the PE optionally has:
[0130] (i) a further substitution of one or more amino acid
residues within one or more B cell epitopes, and the further
substitution for an amino acid within one or more B-cell epitopes
is a substitution of, independently, one or more of amino acid
residues D403, D406, R412, R427, E431, R432, D461, R463, R467,
R490, R505, R513, E522, R538, E548, R551, R576, Q592, and L597 as
defined by reference to SEQ ID NO: 1,
[0131] (ii) a further substitution of one or more amino acid
residues within one or more T-cell epitopes, or
[0132] (iii) both (i) and (ii).
[0133] Another embodiment of the invention provides an isolated,
mutated Pseudomonas exotoxin A (PE), comprising a sequence of the
following formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0134] wherein:
[0135] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3,
[0136] R.sup.1=1 to 10 amino acid residues
[0137] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0138] R.sup.2=1 to 10 amino acid residues;
[0139] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0140] PE functional domain III=residues 395-613 of SEQ ID NO:1,
wherein the PE includes an arginine residue at position 458, as
defined by reference to SEQ ID NO: 1, and
[0141] wherein the PE has:
[0142] (a) a substitution of alanine for amino acid residue
R427;
[0143] (b) a substitution of alanine for amino acid residue
R463;
[0144] (c) a substitution of alanine for amino acid residue
R467;
[0145] (d) a substitution of alanine for amino acid residue
R490;
[0146] (e) a substitution of alanine for amino acid residue R505;
and
[0147] (f) a substitution of alanine for amino acid residue
R538.
[0148] In an embodiment of the invention, n is 0 for R.sup.1 and
R.sup.2 of Formula I. In another embodiment of the invention, n is
1 for R.sup.1 and R.sup.2. In an embodiment of the invention, when
n is 0 for R.sup.1 and R.sup.2, the PE of Formula I may further
comprise a GGS (SEQ ID NO: 283) linking peptide between the furin
cleavage sequence (FCS) and PE functional domain III.
[0149] Without being bound by a particular theory or mechanism, it
is believed that PEs containing the FCS undergo proteolytic
processing inside target cells, thereby activating the cytotoxic
activity of the toxin. The FCS of the inventive PEs may comprise
any suitable furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin. Exemplary furin cleavage sequences
are described in Duckert et al., Protein Engineering, Design &
Selection, 17(1): 107-112 (2004) and International Patent
Application Publication WO 2009/032954, each of which is
incorporated herein by reference. In an embodiment of the
invention, FCS comprises residues 274-284 of SEQ ID NO: 1 (i.e.,
RHRQPRGWEQL (SEQ ID NO: 8)), wherein the substitution of an amino
acid within one or more B-cell epitopes of SEQ ID NO: 1 is a
substitution of alanine, glycine, serine, or glutamine for amino
acid residue E282 of SEQ ID NO: 1. Other suitable FCS amino acid
sequences include, but are not limited to: R-X.sub.1-X.sub.2-R,
wherein X.sub.1 is any naturally occurring amino acid and X.sub.2
is any naturally occurring amino acid (SEQ ID NO: 9), RKKR (SEQ ID
NO: 10), RRRR (SEQ ID NO: 11), RKAR (SEQ ID NO: 12), SRVARS (SEQ ID
NO: 13), TSSRKRRFW (SEQ ID NO: 14), ASRRKARSW (SEQ ID NO: 15),
RRVKKRFW (SEQ ID NO: 16), RNVVRRDW (SEQ ID NO: 17), TRAVRRRSW (SEQ
ID NO: 18), RQPR (SEQ ID NO: 19), RHRQPRGW (SEQ ID NO: 20),
RHRQPRGWE (SEQ ID NO: 21), HRQPRGWEQ (SEQ ID NO: 22), RQPRGWE (SEQ
ID NO: 23), RHRSKRGWEQL (SEQ ID NO: 24), RSKR (SEQ ID NO: 25),
RHRSKRGW (SEQ ID NO: 26), HRSKRGWE (SEQ ID NO: 27), RSKRGWEQL (SEQ
ID NO: 28), HRSKRGWEQL (SEQ ID NO: 29), RHRSKR (SEQ ID NO: 30), and
R-X.sub.1-X.sub.2-R, wherein X.sub.1 is any naturally occurring
amino acid and X.sub.2 is arginine or lysine (SEQ ID NO: 4).
[0150] In still another embodiment of the invention, PE functional
domain III comprises residues 395-613 of SEQ ID NO: 1, wherein one
or more of amino acid residues F443, R456, L477, R494, and L552 as
defined by reference to SEQ ID NO: 1 are, independently,
substituted. Amino acid residues F443, R456, L477, R494, and L552
may be substituted as described herein with respect to other
aspects of the invention.
[0151] In an embodiment of the invention, the FCS is represented by
the formula P4-P3-P2-P1, wherein P4 is an amino acid residue at the
amino end, P1 is an amino acid residue at the carboxyl end, P1 is
an arginine or a lysine residue, and the sequence is cleavable at
the carboxyl end of P1 by furin.
[0152] In another embodiment of the invention, the FCS (i) further
comprises amino acid residues represented by P6-P5 at the amino
end, (ii) further comprises amino acid residues represented by
P1'-P2' at the carboxyl end, (iii) wherein if P1 is an arginine or
a lysine residue, P2' is tryptophan, and P4 is arginine, valine or
lysine, provided that if P4 is not arginine, then P6 and P2 are
basic residues, and (iv) the sequence is cleavable at the carboxyl
end of P1 by furin.
[0153] In still another embodiment of the invention, the PE
functional domain III consists of the sequence of residues 395 to
613 of SEQ ID NO: 1.
[0154] In still another embodiment of the invention, the mutated PE
comprises one or more contiguous residues of residues 365-394 of
SEQ ID NO: 1 between the FCS and the PE domain III.
[0155] Aspects for the development of Pseudomonas exotoxin chimeric
molecules as anti-cancer agents include their cytotoxicity towards
tumor cells, their immunogenicity towards human B-cells and human
T-cells, and their thermal stability. Thermal stability may be
useful for the development of pharmaceutical formulations or
compositions.
[0156] Therefore, in one aspect of the invention, it has been
discovered that by introducing the mutation R456A instead of R458A,
it may be possible to remove all B-cell epitopes from a PE without
substantially reducing their cytotoxicity towards tumor cells (in
case no further T-cell epitopes are removed by further
substitutions). Thus, for the first time, a PE is provided in which
all B-cell epitopes have been fully removed and which retains its
cytotoxic activity.
[0157] An embodiment of the invention provides an isolated, mutated
Pseudomonas exotoxin A (PE), comprising a sequence of the following
formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0158] wherein:
[0159] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3
[0160] R.sup.1=1 to 10 amino acid residues
[0161] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0162] R.sup.2=1 to 10 amino acid residues;
[0163] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0164] PE functional domain III=residues 395-613 of SEQ ID NO: 1,
wherein the PE includes an arginine at position 458, as defined by
reference to SEQ ID NO: 1, and wherein the PE has:
[0165] (a) a substitution of alanine for amino acid residue
R427;
[0166] (b) a substitution of alanine for amino acid residue
R463;
[0167] (c) a substitution of alanine for amino acid residue
R467;
[0168] (d) a substitution of alanine for amino acid residue
R490;
[0169] (e) a substitution of alanine for amino acid residue
R505;
[0170] (f) a substitution of alanine for amino acid residue R538;
and
[0171] (g) a substitution of alanine for amino acid residue
R456.
[0172] In a preferred embodiment, the FCS=a furin cleavage sequence
(FCS) corresponding to amino acid residues 274-284 of SEQ ID NO: 1
(RHRQPRGWEQL (SEQ ID NO: 8)).
[0173] In a preferred embodiment,
[0174] n=1 for R.sup.1 and R.sup.2,
[0175] R.sup.1=a linker of the amino acid sequence of SEQ ID NO:
282 (DKTHKASGG),
[0176] R.sup.2=a linker of the amino acid sequence of SEQ ID NO:
284 (GGGGGS), and
[0177] FCS=furin cleavage sequence (FCS) corresponding to amino
acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)).
In an especially preferred embodiment, n is 0 for R.sup.3.
[0178] In a preferred embodiment, PE functional domain III
comprises the amino acid sequence of SEQ ID NO: 37.
[0179] An embodiment of the invention provides an isolated, mutated
Pseudomonas exotoxin A (PE), comprising a sequence of the following
formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0180] wherein:
[0181] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3
[0182] R.sup.1=1 to 10 amino acid residues
[0183] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0184] R.sup.2=1 to 10 amino acid residues;
[0185] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0186] PE functional domain III=residues 395-613 of SEQ ID NO: 1,
wherein the PE includes an arginine at position 458, as defined by
reference to SEQ ID NO: 1.
[0187] The inventive PE may be less immunogenic than an
unsubstituted PE in accordance with the invention if the immune
response to the inventive PE is diminished, quantitatively or
qualitatively, as compared to the immune response to an
unsubstituted PE. A quantitative decrease in immunogenicity
encompasses a decrease in the magnitude or degree of the immune
response. The magnitude or degree of immunogenicity can be measured
on the basis of any number of known parameters, such as a decrease
in the level of cytokine (e.g., antigen-specific cytokine)
production (cytokine concentration), a decrease in the number of
lymphocytes activated (e.g., proliferation of lymphocytes (e.g.,
antigen-specific lymphocytes)) or recruited, and/or a decrease in
the production of antibodies (antigen-specific antibodies), etc. A
qualitative decrease in immunogenicity encompasses any change in
the nature of the immune response that renders the immune response
less effective at mediating the reduction of the cytotoxic activity
of the PE. Methods of measuring immunogenicity are known in the
art. For example, measuring the types and levels of cytokines
produced can measure immunogenicity. Alternatively or additionally,
measuring the binding of PE to antibodies (e.g., antibodies
previously exposed to PE) and/or measuring the ability of the PE to
induce antibodies when administered to a mammal (e.g., humans,
mice, and/or mice in which the mouse immune system is replaced with
a human immune system) can measure immunogenicity. A less
immunogenic PE may be characterized by a decrease in the production
of cytokines such as any one or more of IFN-.gamma., TNF-.alpha.,
and granzyme B, and/or a reduced stimulation of a cell-mediated
immune response, such as a decrease in the proliferation and
activation of T-cells and/or macrophages specific for PE as
compared to that obtained with an unsubstituted PE. Alternatively
or additionally, less immunogenic PE may be characterized by an
increase in the production of TGF-beta and/or IL-10 as compared to
that obtained with an unsubstituted PE. In a preferred embodiment,
reduced immunogenicity is characterized by any one or more of a
decrease in T cell stimulation, a decrease in T cell proliferation,
and a decrease in T cell IFN.gamma. and/or granzyme B secretion.
Alternatively or additionally, a less immunogenic PE may be
characterized by a decrease in the stimulation and/or activation of
B-cells specific for PE as compared to that obtained with an
unsubstituted PE. For example, less immunogenic PE may be
characterized by a decrease in the differentiation of B cells into
antibody-secreting plasma cells and/or memory cells as compared to
that obtained with an unsubstituted PE. Reduced immunogenicity may
be characterized by any one or more of a decrease in B cell
stimulation, a decrease in B cell proliferation, and a decrease in
anti-PE antibody secretion. Qualitative and quantitative
diminishment of immunogenicity can occur simultaneously and are not
mutually exclusive.
[0188] One of ordinary skill in the art will readily appreciate
that the inventive PEs can be modified in any number of ways, such
that the therapeutic or prophylactic efficacy of the inventive PEs
is increased through the modification. For instance, the inventive
PEs can be conjugated or fused either directly or indirectly
through a linker to a targeting moiety. In this regard, an
embodiment of the invention provides a chimeric molecule comprising
(a) a targeting moiety conjugated or fused to (b) any of the
inventive PEs described herein. The practice of conjugating
compounds, e.g., inventive PEs, to targeting moieties is known in
the art. See, for instance, Wadwa et al., J. Drug Targeting, 3: 111
(1995), and U.S. Pat. No. 5,087,616. In an embodiment, any of the
inventive PEs described herein may lack a targeting moiety. In an
embodiment, any of the inventive PEs described herein may have any
of the targeting moieties having any of the sequences described
herein.
[0189] The term "targeting moiety" as used herein, refers to any
molecule or agent that specifically recognizes and binds to a
cell-surface marker, such that the targeting moiety directs the
delivery of the inventive PE to a population of cells on which
surface the receptor is expressed. Targeting moieties include, but
are not limited to, antibodies (e.g., monoclonal antibodies), or
fragments thereof, peptides, hormones, growth factors, cytokines,
and any other natural or non-natural ligands such as, e.g.,
scaffold antigen binding proteins.
[0190] Scaffold antigen binding proteins are known in the art. For
example, fibronectin and designed ankyrin-repeat proteins (DARPins)
have been used as alternative scaffolds for antigen-binding
domains, see, e.g., Gebauer and Skerra, Curr. Opin. Chem. Biol.,
13:245-255 (2009) and Stumpp et al., Drug Discov. Today, 13:695-701
(2008), both of which are incorporated herein by reference in their
entirety.
[0191] In an embodiment, a scaffold antigen binding protein is
selected from the group consisting of CTLA-4 (Evibody); lipocalin;
Protein A-derived molecules such as the Z-domain of Protein A
(Affibody, SpA), A-domain (Avimer/Maxibody); heat shock proteins
such as GroEI and GroES; transferrin (trans-body); ankyrin repeat
protein (DARPin); peptide aptamer; C-type lectin domain
(Tetranectin); human .gamma.-crystallin and human ubiquitin
(affilins); PDZ domains; scorpion toxinkunitz-type domains of human
protease inhibitors; and fibronectin (adnectin), which has been
subjected to protein engineering in order to obtain binding to a
ligand other than the natural ligand.
[0192] CTLA-4 (Cytotoxic T Lymphocyte-associated Antigen 4) is a
CD28-family receptor expressed mainly by CD4+ T-cells. Its
extracellular domain has a variable domain-like Ig fold. Loops
corresponding to CDRs of antibodies can be substituted with a
heterologous sequence to confer different binding properties.
CTLA-4 molecules engineered to have different binding specificities
are also referred to as Evibodies. For further details, see 1
Immunol. Methods, 248(1-2): 31-45 (2001).
[0193] Lipocalins are a family of extracellular proteins which
transport small hydrophobic molecules such as steroids, bilins,
retinoids and lipids. They have a rigid beta-sheet secondary
structure with a number of loops at the open end of the conical
structure which can be engineered to bind to different target
antigens. Anticalins are between 160-180 amino acids in size, and
are derived from lipocalins. For further details, see Biochim.
Biophys. Acta., 1482: 337-350 (2000), U.S. Pat. No. 7,250,297B1 and
US20070224633.
[0194] An affibody is a scaffold derived from Protein A of
Staphylococcus aureus which can be engineered to bind to an
antigen. The domain includes a three-helical bundle of
approximately 58 amino acids. Libraries have been generated by the
randomization of surface residues. For further details, see Protein
Eng. Des. Sel., 17: 455-462 (2004) and EP1641818A1. Avimers are
multidomain proteins derived from the A-domain scaffold family. The
native domains of approximately 35 amino acids adopt a defined
disulphide bonded structure. Diversity is generated by shuffling
the natural variation exhibited by the family of A-domains. For
further details, see Nature Biotechnology, 23(12): 1556-1561 (2005)
and Expert Opinion on Investigational Drugs, 16(6): 909-917
(2007).
[0195] A transferrin is a monomeric serum transport glycoprotein.
Transferrins can be engineered to bind to different target antigens
by the insertion of peptide sequences in a permissive surface loop.
Examples of engineered transferrin scaffolds include the
Trans-body. For further details, see J. Biol. Chem., 274:
24066-24073 (1999).
[0196] Designed Ankyrin Repeat Proteins (DARPins) are derived from
Ankyrin which is a family of proteins that mediate attachment of
integral membrane proteins to the cytoskeleton. A single ankyrin
repeat is a 33 residue motif consisting of two alpha-helices and a
beta-turn. They can be engineered to bind to different target
antigens by randomizing residues in the first alpha-helix and a
beta-turn of each repeat. Their binding interface can be increased
by increasing the number of modules (a method of affinity
maturation). For further details, see J. Mol Biol., 332: 489-503
(2003); PNAS, 100(4): 1700-1705 (2003); J. Mol. Biol., 369,
1015-1028 (2007); and U.S. Patent Application Publication
20040132028A1.
[0197] Fibronectin is a scaffold which can be engineered to bind to
antigen. Adnectins contain a backbone of the natural amino acid
sequence of the 10th domain of the 15 repeating units of human
fibronectin type III (FN3). Three loops at one end of the
beta-sandwich can be engineered to enable an Adnectin to
specifically recognize a therapeutic target of interest. For
further details see Protein Eng. Des. Sel., 18: 435-444 (2005),
U.S. Patent Application Publication 20080139791, International
Patent Application Publication WO 2005056764 and U.S. Pat. No.
6,818,418B1.
[0198] Peptide aptamers are combinatorial recognition molecules
that include a constant scaffold protein, typically thioredoxin
(TrxA), which contains a constrained variable peptide loop inserted
at the active site. For further details, see Expert Opin. Biol.
Ther., 5: 783-797 (2005).
[0199] Microbodies are derived from naturally occurring
microproteins of 25-50 amino acids in length which contain 3-4
cysteine bridges. Examples of microproteins include KalataBI,
conotoxin, and knottins. The microproteins have a loop which can be
engineered to include up to 25 amino acids without affecting the
overall fold of the microprotein. For further details of engineered
knottin domains, see International Patent Application Publication
WO 2008098796.
[0200] Other antigen binding proteins include proteins which have
been used as a scaffold to engineer different target antigen
binding properties, including human gamma-crystallin and human
ubiquitin (affilins), kunitz type domains of human protease
inhibitors, PDZ-domains of the Ras-binding protein AF-6, scorpion
toxins (charybdotoxin), and C-type lectin domain (tetranectins).
See Chapter 7--Non-Antibody Scaffolds from Handbook of Therapeutic
Antibodies (2007, edited by Stefan Dubel) and Protein Science,
15:14-27 (2006). Epitope binding domains of the present invention
could be derived from any of these alternative protein domains.
[0201] The term "antibody," as used herein, refers to whole (also
known as "intact") antibodies or antigen binding portions thereof
that retain antigen recognition and binding capability. The
antibody or antigen binding portions thereof can be a
naturally-occurring antibody or antigen binding portion thereof,
e.g., an antibody or antigen binding portion thereof isolated
and/or purified from a mammal, e.g., mouse, rabbit, goat, horse,
chicken, hamster, human, etc. The antibody or antigen binding
portion thereof can be in monomeric or polymeric form. Also, the
antibody or antigen binding portion thereof can have any level of
affinity or avidity for the cell surface marker. Desirably, the
antibody or antigen binding portion thereof is specific for the
cell surface marker, such that there is minimal cross-reaction with
other peptides or proteins.
[0202] The antibody may be monoclonal or polyclonal and of any
isotype, e.g., IgM, IgG (e.g. IgG, IgG2, IgG3 or IgG4), IgD, IgA or
IgE. Complementarity determining regions (CDRs) of an antibody or
single chain variable fragments (Fvs) of an antibody against a
target cell surface marker can be grafted or engineered into an
antibody of choice to confer specificity for the target cell
surface marker upon that antibody. For example, the CDRs of an
antibody against a target cell surface marker can be grafted onto a
human antibody framework of a known three dimensional structure
(see, e.g., International Patent Application Publications WO
1998/045322 and WO 1987/002671; U.S. Pat. Nos. 5,859,205;
5,585,089; and 4,816,567; European Patent Application Publication
0173494; Jones et al., Nature, 321:522 (1986); Verhoeyen et al.,
Science, 239: 1534 (1988), Riechmann et al., Nature, 332:323
(1988); and Winter & Milstein, Nature, 349: 293 (1991)) to form
an antibody that may raise little or no immunogenic response when
administered to a human. In a preferred embodiment, the targeting
moiety is a monoclonal antibody or an antigen binding portion of
the monoclonal antibody.
[0203] The antigen binding portion can be any portion that has at
least one antigen binding site, such as, e.g., the variable regions
or CDRs of the intact antibody. Examples of antigen binding
portions of antibodies include, but are not limited to, a heavy
chain, a light chain, a variable or constant region of a heavy or
light chain, a single chain variable fragment (scFv), or an Fc,
Fab, Fab', Fv, or F(ab).sub.2' fragment; single domain antibodies
(see, e.g., Wesolowski, Med Microbiol Immunol., 198(3): 157-74
(2009); Saerens et al., Curr. Opin. Pharmacol., 8(5):600-8 (2008);
Harmsen and de Haard, Appl. Microbiol. Biolechnol., 77(1): 13-22
(2007), helix-stabilized antibodies (see, e.g., Arndt et al., J.
Mol. Biol., 312: 221-228 (2001); triabodies; diabodies (European
Patent Application Publication 0404097; International Patent
Application Publication WO 1993/011161; and Hollinger et al., Proc.
Natl. Acad. Sci. USA, 90: 6444-6448 (1993)); single-chain antibody
molecules ("scFvs," see, e.g., U.S. Pat. No. 5,888,773); disulfide
stabilized antibodies ("dsFvs," see, e.g., U.S. Pat. Nos. 5,747,654
and 6,558,672), and domain antibodies ("dAbs," see, e.g., Holt et
al., Trends Biotech, 21(11):484-490 (2003), Ghahroudi et al., FEBS
Lett., 414:521-526 (1997), Lauwereys et al., EMBO J 17:3512-3520
(1998), Reiter et al., J. Mol. Biol. 290:685-698 (1999); and Davies
and Riechmann, Biotechnology, 13:475-479 (2001)).
[0204] Methods of testing antibodies or antigen binding portions
thereof for the ability to bind to any cell surface marker are
known in the art and include any antibody-antigen binding assay,
such as, for example, radioimmunoassay (RIA), ELISA, Western blot,
immunoprecipitation, and competitive inhibition assays (see, e.g.,
Janeway et al., infra, and U.S. Patent Application Publication
2002/0197266 A1).
[0205] Suitable methods of making antibodies are known in the art.
For instance, standard hybridoma methods are described in, e.g.,
Kohler and Milstein, Eur. J Immunol., 5, 511-519 (1976), Harlow and
Lane (eds.), Antibodies: A Laboratory Manual, CSH Press (1988), and
C. A. Janeway et al. (eds.), Immunobiology, 5.sup.th Ed., Garland
Publishing, New York, N.Y. (2001)). Alternatively, other methods,
such as EBV-hybridoma methods (Haskard and Archer, J. Immunol.
Methods, 74(2), 361-67 (1984), and Roder et al., Methods Enzymol.,
121, 140-67 (1986)), and bacteriophage vector expression systems
(see, e.g., Huse et al., Science, 246, 1275-81 (1989)) are known in
the art. Further, methods of producing antibodies in non-human
animals are described in, e.g., U.S. Pat. Nos. 5,545,806,
5,569,825, and 5,714,352, and U.S. Patent Application Publication
2002/0197266 A1.
[0206] Phage display also can be used to generate the antibody that
may be used in the chimeric molecules of the invention. In this
regard, phage libraries encoding antigen-binding variable (V)
domains of antibodies can be generated using standard molecular
biology and recombinant DNA techniques (see, e.g., Sambrook et al.
(eds.), Molecular Cloning, A Laboratory Manual, 3.sup.rd Edition,
Cold Spring Harbor Laboratory Press, New York (2001)). Phage
encoding a variable region with the desired specificity are
selected for specific binding to the desired antigen, and a
complete or partial antibody is reconstituted comprising the
selected variable domain. Nucleic acid sequences encoding the
reconstituted antibody are introduced into a suitable cell line,
such as a myeloma cell used for hybridoma production, such that
antibodies having the characteristics of monoclonal antibodies are
secreted by the cell (see, e.g., Janeway et al., supra, Huse et
al., supra, and U.S. Pat. No. 6,265,150).
[0207] Alternatively, antibodies can be produced by transgenic mice
that are transgenic for specific heavy and light chain
immunoglobulin genes. Such methods are known in the art and
described in, for example U.S. Pat. Nos. 5,545,806 and 5,569,825,
and Janeway et al., supra.
[0208] Alternatively, the antibody can be a genetically-engineered
antibody, e.g., a humanized antibody or a chimeric antibody.
Humanized antibodies advantageously provide a lower risk of side
effects and can remain in the circulation longer. Methods for
generating humanized antibodies are known in the art and are
described in detail in, for example, Janeway et al., supra, U.S.
Pat. Nos. 5,225,539, 5,585,089 and 5,693,761, European Patent
0239400 B1, and United Kingdom Patent 2188638. Humanized antibodies
can also be generated using the antibody resurfacing technology
described in, for example, U.S. Pat. No. 5,639,641 and Pedersen et
al., J. Mol. Biol., 235, 959-973 (1994).
[0209] The targeting moiety may specifically bind to any suitable
cell surface marker. The choice of a particular targeting moiety
and/or cell surface marker may be chosen depending on the
particular cell population to be targeted. Cell surface markers are
known in the art (see, e.g., Mufson et al., Front. Biosci.,
11:337-43 (2006); Frankel et al., Clin. Cancer Res., 6:326-334
(2000); and Kreitman et al., AAPS Journal, 8(3): E532-E551 (2006))
and may be, for example, a protein or a carbohydrate. In an
embodiment of the invention, the targeting moiety is a ligand that
specifically binds to a receptor on a cell surface. Exemplary
ligands include, but are not limited to, vascular endothelial
growth factor (VEGF), Fas, TNF-related apoptosis-inducing ligand
(TRAIL), a cytokine (e.g., IL-2, IL-15, IL-4, IL-13), a lymphokine,
a hormone, and a growth factor (e.g., transforming growth factor
(TGFa), neuronal growth factor, epidermal growth factor).
[0210] The cell surface marker can be, for example, a cancer
antigen. The term "cancer antigen" as used herein refers to any
molecule (e.g., protein, peptide, lipid, carbohydrate, etc.) solely
or predominantly expressed or over-expressed by a tumor cell or
cancer cell, such that the antigen is associated with the tumor or
cancer. The cancer antigen can additionally be expressed by normal,
non-tumor, or non-cancerous cells. However, in such cases, the
expression of the cancer antigen by normal, non-tumor, or
non-cancerous cells is not as robust as the expression by tumor or
cancer cells. In this regard, the tumor or cancer cells can
over-express the antigen or express the antigen at a significantly
higher level, as compared to the expression of the antigen by
normal, non-tumor, or non-cancerous cells. Also, the cancer antigen
can additionally be expressed by cells of a different state of
development or maturation. For instance, the cancer antigen can be
additionally expressed by cells of the embryonic or fetal stage,
which cells are not normally found in an adult host. Alternatively,
the cancer antigen can be additionally expressed by stem cells or
precursor cells, which cells are not normally found in an adult
host.
[0211] The cancer antigen can be an antigen expressed by any cell
of any cancer or tumor, including the cancers and tumors described
herein. The cancer antigen may be a cancer antigen of only one type
of cancer or tumor, such that the cancer antigen is associated with
or characteristic of only one type of cancer or tumor.
Alternatively, the cancer antigen may be a cancer antigen (e.g.,
may be characteristic) of more than one type of cancer or tumor.
For example, the cancer antigen may be expressed by both breast and
prostate cancer cells and not expressed at all by normal,
non-tumor, or non-cancer cells.
[0212] Exemplary cancer antigens to which the targeting moiety may
specifically bind include, but are not limited to mucin 1 (MUC1;
tumor-associated epithelial mucin), melanoma associated antigen
(MAGE), preferentially expressed antigen of melanoma (PRAME),
carcinoembryonic antigen (CEA), prostate-specific antigen (PSA),
prostate specific membrane antigen (PSMA), granulocyte-macrophage
colony-stimulating factor receptor (GM-CSFR), CD56, human epidermal
growth factor receptor 2 (HER2/neu) (also known as erbB-2), CD5,
CD7, tyrosinase tumor antigen, tyrosinase related protein (TRP)1,
TRP2, NY-ESO-1, telomerase, and p53. In a preferred embodiment, the
cell surface marker, to which the targeting moiety specifically
binds, is selected from the group consisting of cluster of
differentiation (CD) 19, CD21, CD22, CD25, CD30, CD33 (sialic acid
binding Ig-like lectin 3, myeloid cell surface antigen), CD79b,
CD123 (interleukin 3 receptor alpha), transferrin receptor, EGF
receptor, mesothelin, cadherin, Lewis Y, Glypican-3, FAP
(fibroblast activation protein alpha), PSMA (prostate specific
membrane antigen), CA9=CAIX (carbonic anhydrase IX), L1 CAM (neural
cell adhesion molecule L1), Endosialin, HER3 (activated
conformation of epidermal growth factor receptor family member 3),
Alkl/BMP9 complex (anaplastic lymphoma kinase 1/bone morphogenetic
protein 9), TPBG=5T4 (trophoblast glycoprotein), ROR1 (receptor
tyrosine kinase-like surface antigen), HER1 (activated conformation
of epidermal growth factor receptor), and CLL1 (C-type lectin
domain family 12, member A). Mesothelin is expressed in, e.g.,
ovarian cancer, mesothelioma, non-small cell lung cancer, lung
adenocarcinoma, fallopian tube cancer, head and neck cancer,
cervical cancer, and pancreatic cancer. CD22 is expressed in, e.g.,
hairy cell leukemia, chronic lymphocytic leukemia (CLL),
prolymphocytic leukemia (PLL), non-Hodgkin's lymphoma, small
lymphocytic lymphoma (SLL), and acute lymphatic leukemia (ALL).
CD25 is expressed in, e.g., leukemias and lymphomas, including
hairy cell leukemia and Hodgkin's lymphoma. Lewis Y antigen is
expressed in, e.g., bladder cancer, breast cancer, ovarian cancer,
colorectal cancer, esophageal cancer, gastric cancer, lung cancer,
and pancreatic cancer. CD33 is expressed in, e.g., acute myeloid
leukemia (AML), chronic myelomonocytic leukemia (CML), and
myeloproliferative disorders.
[0213] In an embodiment of the invention, the targeting moiety is
an antibody that specifically binds to a cancer antigen. Exemplary
antibodies that specifically bind to cancer antigens include, but
are not limited to, antibodies against the transferrin receptor
(e.g., HB21 and variants thereof), antibodies against CD22 (e.g.,
RFB4 and variants thereof), antibodies against CD25 (e.g., anti-Tac
and variants thereof), antibodies against mesothelin (e.g., SS1,
MORAb-009, SS, HN1, HN2, MN, MB, and variants thereof) and
antibodies against Lewis Y antigen (e.g., B3 and variants thereof).
In this regard, the targeting moiety may be an antibody selected
from the group consisting of B3, RFB4, SS, SS1, MN, MB, HN1, HN2,
HB21, and MORAb-009, and antigen binding portions thereof. Further
exemplary targeting moieties suitable for use in the inventive
chimeric molecules are disclosed e.g., in U.S. Pat. No. 5,242,824
(anti-transferrin receptor); 5,846,535 (anti-CD25); 5,889,157
(anti-Lewis Y); 5,981,726 (anti-Lewis Y); 5,990,296 (anti-Lewis Y);
U.S. Pat. No. 7,081,518 (anti-mesothelin); 7,355,012 (anti-CD22 and
anti-CD25); U.S. Pat. No. 7,368,110 (anti-mesothelin); 7,470,775
(anti-CD30); 7,521,054 (anti-CD25); and 7,541,034 (anti-CD22); U.S.
Patent Application Publication 2007/0189962 (anti-CD22); Frankel et
al., Clin. Cancer Res., 6: 326-334 (2000), and Kreitman et al.,
AAPS Journal, 8(3): E532-E551 (2006), each of which is incorporated
herein by reference. In another embodiment, the targeting moiety
may include the targeting moiety of immunotoxins known in the art.
Exemplary immunotoxins include, but are not limited to, LMB-2
(Anti-Tac(Fv)-PE38), BL22 and HA22 (RFB4(dsFv)-PE38), SS1P (SS1
(dsFv)-PE38), HB21-PE40, and variants thereof. In a preferred
embodiment, the targeting moiety is the antigen binding portion of
HA22. HA22 comprises a disulfide-linked Fv anti-CD22 antibody
fragment conjugated to PE38. HA22 and variants thereof are
disclosed in International Patent Application Publications WO
2003/027135 and WO 2009/032954, which are incorporated herein by
reference.
[0214] The antigen binding portion of the targeting moiety may
comprise a light chain variable region and/or a heavy chain
variable region. In an embodiment of the invention, the heavy chain
variable region comprises a heavy chain CDR1 region, a heavy chain
CDR2 region, and a heavy chain CDR3 region. In this regard, the
antigen binding domain may comprise one or more of a heavy chain
CDR1 region comprising SEQ ID NO: 49, 65, 81, 97, 113, 129, 145,
161, or 177; a heavy chain CDR2 region comprising SEQ ID NO: 53,
69, 85, 101, 117, 133, 149, 165, or 181; and a heavy chain CDR3
region comprising SEQ ID NO: 57, 73, 89, 105, 121, 137, 153, 169,
or 185. Preferably, the heavy chain comprises all of SEQ ID NOs:
(a) 49, 53, and 57 (anti-mesothelin heavy chain CDR1-CDR3,
respectively); (b) SEQ ID NOs: 65, 69, and 73 (anti-glypican-3 gc33
heavy chain CDR1-CDR3, respectively); (c) SEQ ID NOs: 81, 85, and
89 (anti-glypican 3 ab acidic heavy chain CDR1-CDR3, respectively);
(d) SEQ ID NOs: 97, 101, and 105 (anti-Fap heavy chain CDR1-CDR3,
respectively); (e) SEQ ID NOs: 113, 117, 121 (anti-PSMA heavy chain
CDR1-CDR3, respectively); (f) SEQ ID NOs: 129, 133, and 137
(anti-CAIX heavy chain CDR1-CDR3, respectively); (g) SEQ ID NOs:
145, 149, and 153 (anti-L1CAM-(1) heavy chain CDR1-CDR3,
respectively); (h) SEQ ID NOs: 161, 165, 169 (anti-L1CAM (2) heavy
chain CDR1-CDR3, respectively); or (i) SEQ ID NOs: 177, 181, and
185 (anti-L1CAM(3) heavy chain CDR1-CDR3, respectively).
[0215] In an embodiment of the invention, the light chain variable
region may comprise a light chain CDR1 region, a light chain CDR2
region, and a light chain CDR3 region. In this regard, the antigen
binding domain may comprise one or more of a light chain CDR1
region comprising SEQ ID NO: 50, 66, 82, 98, 114, 130, 146, 162, or
178; a light chain CDR2 region comprising SEQ ID NO: 54, 70, 86,
102, 118, 134, 150, 166, or 182; and a light chain CDR3 region
comprising SEQ ID NO: 58, 74, 90, 106, 122, 138, 154, 170, or 186.
Preferably, the light chain comprises all of (a) SEQ ID NOs: 50,
54, and 58 (anti-mesothelin light chain CDR1-CDR3, respectively);
(b) SEQ ID NOs: 66, 70, and 74 (anti-glypican-3 ab gc33 light chain
CDR1-CDR-3, respectively); (c) SEQ ID NOs: 82, 86, and 90
(anti-glypican 3 ab acidic light chain CDR1-CDR3, respectively);
(d) SEQ ID NOs: 98, 102, and 106 (anti-FAP light chain CDR1-CDR3,
respectively); (e) SEQ ID NOs: 114, 118, and 122 (anti-PSMA light
chain CDR1-3, respectively); (f) SEQ ID NOs: 130, 134, and 138
(anti-CAIX light chain CDR1-CDR3, respectively); (g) SEQ ID NOs:
146, 150, and 154 (anti-L1CAM-(1) light chain CDR1-CDR3,
respectively); (h) SEQ ID NOs: 162, 166, and 170 (anti-L1CAM-(2)
light chain CDR1-CDR3, respectively); or (i) SEQ ID NOs: 178, 182,
and 186 (anti-L1CAM-(3) light chain CDR1-CDR3, respectively).
[0216] In an especially preferred embodiment, the antigen binding
portion comprises the CDR1, CDR2, CDR3 regions of the light chain
and the CDR1, CDR2, CDR3 regions of the heavy chain. In this
regard, the antigen binding portion comprises (a) SEQ ID NOs: 49,
50, 53, 54, 57, and 58; (b) SEQ ID NOs: 65, 66, 69, 70, 73, and 74;
(c) SEQ ID NOs: 81, 82, 85, 86, 89, and 90; (d) SEQ ID NOs: 97, 98,
101, 102, 105, and 106; (e) SEQ ID NOs: 113, 114, 117, 118, 121,
and 122; (f) SEQ ID NOs: 129, 130, 133, 134, 137, and 138; (g) SEQ
ID NOs: 145, 146, 149, 150, 153, and 154; (h) SEQ ID NOs: 161, 162,
165, 166, 169, and 170; or (i) SEQ ID NOs: 177, 178, 181, 182, 185,
and 186.
[0217] In an embodiment, the antigen binding portion comprises
framework regions FR1, FR2, FR3, FR4 of the heavy chain and FR1,
FR2, FR3, FR4 of the light chain in addition to the CDR regions
described above. In this regard, the antigen binding portion may
comprise a heavy chain FR1 region comprising SEQ ID NO: 47, 63, 79,
95, 111, 127, 143, 159, or 175; a heavy chain FR2 region comprising
SEQ ID NO: 51, 67, 83, 99, 115, 131, 147, 163, or 179; a heavy
chain FR3 region comprising SEQ ID NO: 55, 71, 87, 103, 119, 135,
151, 167, 183; and a heavy chain FR4 region comprising SEQ ID NO:
59, 75, 91, 107, 123, 139, 155, 171, or 187. The antigen binding
portion may comprise a light chain FR1 region comprising SEQ ID NO:
48, 64, 80, 96, 112, 128, 144, 160, 176; a light chain FR2 region
comprising SEQ ID NO: 52, 68, 84, 100, 116, 132, 148, 164, or 180;
a FR3 region comprising SEQ ID NO: 56, 72, 88, 104, 120, 136, 152,
168, or 184; and a FR4 region comprising SEQ ID NO: 60, 76, 92,
108, 124, 140, 156, 172, or 188. Preferably, the antigen binding
portion comprises the FR1, FR2, FR3, F4, CDR1, CDR2, and CDR3
regions of the light chain and the FR1, FR2, FR3, F4, CDR1, CDR2,
and CDR3 regions of the heavy chain. In this regard, the antigen
binding portion comprises (a) SEQ ID NOs: 47-60 (anti-mesothelin);
(b) SEQ ID NOs: 63-76 (anti-glypican-3 ab gc33); (c) SEQ ID NOs:
79-92 (anti-glypican 3 ab acidic); (d) SEQ ID NOs: 95-108
(anti-FAP); (e) SEQ ID NOs: 111-124 (anti-PSMA); (f) SEQ ID NOs:
127-140 (anti-CAIX); (g) SEQ ID NOs: 143-156 (anti-L1CAM(1)); (h)
SEQ ID NOs: 159-172 (anti-L1CAM(2)); or (i) SEQ ID NOs: 175-188
(anti-L1CAM(3)).
[0218] In an embodiment, the light chain variable region of the
antigen binding domain may comprise SEQ ID NO: 46, 62, 78, 94, 110,
126, 142, 158, or 174. In an embodiment, the heavy chain variable
region of the antigen binding domain may comprise SEQ ID NO: 45,
61, 77, 93, 109, 125, 141, 157, or 173. In a preferred embodiment,
the antigen binding domain comprises both (a) SEQ ID NOs: 45 and 46
(anti-mesothelin); (b) SEQ ID NOs: 61 and 62 (anti-glypican-3 ab
gc33); (c) SEQ ID NOs: 77 and 78 (anti-gc33 acidic); (d) SEQ ID
NOs: 93 and 94 (anti-FAP); (e) SEQ ID NOs: 109 and 110 (anti-PSMA);
(I) SEQ ID NOs: 125 and 126 (anti-CAIX); (g) SEQ ID NOs: 141 and
142 (anti-L1CAM(1)); (h) SEQ ID NOs: 157 and 158 (anti-L1CAM(2));
(i) SEQ ID NOs: 173 and 174 (anti-L1CAM(3)); or (j) SEQ ID NOs: 93
and 290 (anti-FAP).
[0219] Another aspect of the invention is a humanized
anti-mesothelin antibody comprising the comprising the variable
heavy chain domain VH of SEQ ID NO: 45 and the variable light chain
domain of SEQ ID NO: 46. The humanized antibody was generated by
using mouse anti-mesothelin antibody SS1 as a starting material and
generating specific combinations of certain framework regions with
the CDR regions of mouse SS1 antibody. The humanized antibody
advantageously provides good binding properties, stability, and
developability.
[0220] In an embodiment of the invention, the targeting moiety may
be humanized. In an embodiment of the invention, the targeting
moiety is a humanized SS1 or an antigen binding portion of the
humanized SS1. In this regard, the targeting moiety may comprise a
light chain comprising SEQ ID NO: 33 (cFp-0199) and a heavy chain
comprising SEQ ID NO: 38 (cFp-0200). In another embodiment, the
targeting moiety may comprise a light chain comprising SEQ ID NOs:
31 (cFp-0199 humanized variable light chain domain VL) and SEQ ID
NO: 32 (cFp-0199 kappa constant light chain domain). In an
embodiment, the targeting moiety may comprise a heavy chain
comprising SEQ ID NOs: 34 (cFp-0200 humanized variable heavy chain
domain VH) and SEQ ID NO: 35 (cFp-0200 constant heavy chain domain
CH1). In an embodiment, the targeting moiety comprises all of SEQ
ID NOs: 31, 32, 34, and 35.
[0221] In an embodiment of the invention, the chimeric molecule
comprises a linker. The term "linker" as used herein, refers to any
agent or molecule that connects the inventive PE to the targeting
moiety. One of ordinary skill in the art recognizes that sites on
the inventive PE, which are not necessary for the function of the
inventive PE, are ideal sites for attaching a linker and/or a
targeting moiety, provided that the linker and/or targeting moiety,
once attached to the inventive PE, do(es) not interfere with the
function of the inventive PE, i.e., cytotoxic activity, inhibit
growth of a target cell, or to treat or prevent cancer. The linker
may be capable of forming covalent bonds to both the PE and the
targeting moiety. Suitable linkers are known in the art and
include, but are not limited to, straight or branched-chain carbon
linkers, heterocyclic carbon linkers, and peptide linkers. Where
the PE and the targeting moiety are polypeptides, the linker may be
joined to the amino acids through side groups (e.g., through a
disulfide linkage to cysteine). Preferably, the linkers will be
joined to the alpha carbon of the amino and carboxyl groups of the
terminal amino acids.
[0222] In another aspect of the invention, it has been discovered
that by introducing specific amino acids at both sides of the furin
cleavage sequence (FCS), a more stable chimeric molecule of the
Pseudomonas exotoxin with a targeting moiety has been provided. In
addition, further potential T-cell epitopes in the linker region
have been removed, which may be particularly advantageous when
using Fab fragments of an antibody as a targeting moiety. These
chimeric molecules provide improved thermodynamic stability
compared to chimeric molecules without these elongated linkers and
retain their cytotoxicity towards tumor cells. Accordingly, in an
embodiment of the invention, the linker is an elongated linker. The
elongated linker may comprise SEQ ID NO: 36.
[0223] In a preferred embodiment,
R.sup.1.sub.n--FCS--R.sup.2.sub.n=a linker of the amino acid
sequence of SEQ ID NO: 36. The furin cleavage site is located
between amino acid residues 15 and 16 of SEQ ID NO: 36.
[0224] An embodiment of the invention provides a chimeric molecule
comprising (a) a targeting moiety conjugated or fused to (b) any of
the PEs described herein.
[0225] An embodiment of the invention provides an isolated chimeric
molecule comprising (a) a targeting moiety conjugated or fused to
(b) a mutated Pseudomonas exotoxin A (PE), comprising a sequence of
the following formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0226] wherein:
[0227] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3
[0228] R.sup.1=1 to 10 amino acid residues
[0229] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0230] R.sup.2=1 to 10 amino acid residues;
[0231] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0232] PE functional domain III=residues 395-613 of SEQ ID NO: 1,
wherein the PE includes an arginine at position 458, as defined by
reference to SEQ ID NO: 1, and wherein the PE has:
[0233] (a) a substitution of alanine for amino acid residue
R427;
[0234] (b) a substitution of alanine for amino acid residue
R463;
[0235] (c) a substitution of alanine for amino acid residue
R467;
[0236] (d) a substitution of alanine for amino acid residue
R490;
[0237] (e) a substitution of alanine for amino acid residue
R505;
[0238] (f) a substitution of alanine for amino acid residue R538;
and
[0239] (g) a substitution of alanine for amino acid residue
R456.
[0240] In a preferred embodiment of the chimeric molecule, the
FCS=furin cleavage sequence (FCS) corresponding to amino acid
residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)).
[0241] In a preferred embodiment of the chimeric molecule,
[0242] n=1 for R.sup.1 and R.sup.2,
[0243] R.sup.1=a linker of the amino acid sequence of SEQ ID NO:
282 (DKTHKASGG),
[0244] R.sup.2=a linker of the amino acid sequence of SEQ ID NO:
284 (GGGGGS), and
[0245] FCS=furin cleavage sequence (FCS) corresponding to amino
acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)).
In an especially preferred embodiment, n is 0 for R.sup.3.
[0246] In a preferred embodiment of the chimeric molecule,
R.sup.1.sub.n--FCS--R.sup.2.sub.n=a linker of the amino acid
sequence of SEQ ID NO: 36 and the targeting moiety comprises the
Fab fragment of an antibody.
[0247] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-mesothelin antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (LO10R-456A). In one preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-mesothelin antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 45 and the variable light chain domain of SEQ ID
NO: 46. In this regard, the chimeric molecule may comprise (a) SEQ
ID NOs: 39 and 40; (b) SEQ ID NOs: 41 and 42; or (c) SEQ ID NOs: 43
and 44.
[0248] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (L010R-456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 61 and the variable light chain domain of SEQ ID
NO: 62.
[0249] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (L010R-456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 77 and the variable light chain domain of SEQ ID
NO: 78.
[0250] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-FAP antibody, a FCS
corresponding to amino acid residues 274-284 of SEQ ID NO: 1
(RHRQPRGWEQL (SEQ ID NO: 8)) and a PE comprising SEQ ID NO: 37
(L010R-456A). In a preferred embodiment, the chimeric molecule
comprises the antigen binding portion of an anti-FAP antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (L010R-456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-FAP antibody comprising the CDR1, CDR2 and CDR3 of the
variable heavy chain domain VH of SEQ ID NO: 93 (SEQ ID NOs: 97,
101, and 105, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 94 (SEQ ID NOs: 98, 102,
and 106, respectively). In one preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-FAP antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 93 and
the variable light chain domain of SEQ ID NO: 94. In another
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-FAP antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 93 and the variable light chain
domain VL of SEQ ID NO: 290. In this regard, the chimeric molecule
may comprise (a) SEQ ID NOs: 291 and 293; (b) SEQ ID NOs: 291 and
294; or (c) SEQ ID NOs: 292 and 294.
[0251] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-PSMA antibody, a FCS
corresponding to amino acid residues 274-284 of SEQ ID NO: 1
(RHRQPRGWEQL (SEQ ID NO: 8)) and a PE comprising SEQ ID NO: 37
(L010R-456A). In a preferred embodiment, the chimeric molecule
comprises the antigen binding portion of an anti-PSMA antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (L010R-456A). In s preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-PSMA antibody comprising the CDR1, CDR2 and CDR3 of the
variable heavy chain domain VH of SEQ ID NO: 109 (SEQ ID NOs: 113,
117, and 121, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 110 (SEQ ID NOs: 114,
118, and 122, respectively).
[0252] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-CAIX antibody, a FCS
corresponding to amino acid residues 274-284 of SEQ ID NO: 1
(RHRQPRGWEQL (SEQ ID NO: 8)) and a PE comprising SEQ ID NO: 37
(L010R-456A). In a preferred embodiment, the chimeric molecule
comprises the antigen binding portion of an anti-CAIX antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (L010R-456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-CAIX antibody comprising the CDR1, CDR2 and CDR3 of the
variable heavy chain domain VH of SEQ ID NO: 125 (SEQ ID NOs: 129,
133, and 137, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 126 (SEQ ID NOs: 130,
134, and 138, respectively). In this regard, the chimeric molecule
may comprise (a) SEQ ID NOs: 295 and 297 or (b) SEQ ID NOs: 296 and
297.
[0253] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-L1CAM antibody, a FCS
corresponding to amino acid residues 274-284 of SEQ ID NO: 1
(RHRQPRGWEQL (SEQ ID NO: 8)) and a PE comprising SEQ ID NO: 37
(L010R-456A). In a preferred embodiment, the chimeric molecule
comprises the antigen binding portion of an anti-L1CAM antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 37 (L010R-456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-L1CAM antibody comprising the CDR1, CDR2 and CDR3 of the
variable heavy chain domain VH of SEQ ID NO: 141 (SEQ ID NOs: 145,
149, and 153, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 142 (SEQ ID NOs: 146,
150, and 154, respectively). In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-L1CAM antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 157 and
the variable light chain domain of SEQ ID NO: 158. In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-L1CAM antibody comprising the variable heavy chain domain VH
of SEQ ID NO: 173 and the variable light chain domain of SEQ ID NO:
174.
[0254] In a preferred embodiment, the invention provides an
isolated chimeric molecule comprising (a) a targeting moiety
conjugated or fused to (b) a mutated Pseudomonas exotoxin A (PE),
comprising a sequence of the following formula:
R.sup.1.sub.n--FCS--R.sup.2.sub.n--R.sup.3.sub.n-PE functional
domain III
[0255] wherein:
[0256] n=0 or 1 independently for each of R.sup.1, R.sup.2 and
R.sup.3
[0257] R.sup.1=1 to 10 amino acid residues
[0258] FCS=a furin cleavage sequence of amino acid residues, which
sequence is cleavable by furin and has an amino end and a carboxyl
end,
[0259] R.sup.2=1 to 10 amino acid residues;
[0260] R.sup.3=1 or more contiguous residues of residues 365-394 of
SEQ ID NO: 1; and,
[0261] PE functional domain III=residues 395-613 of SEQ ID NO:
1,
[0262] wherein one or more of amino acid residues F443, L477, R494,
and L552 as defined by reference to SEQ ID NO: 1 are, independently
substituted;
[0263] and the PE comprises optionally a further substitution of an
amino acid within one or more B-cell epitopes.
[0264] It has been discovered that a substitution of histidine in
place of amino acid residue L477 leads to a strong reduction of T
cell responses compared to substitutions with other amino acids
(see, for example, Example 4) while at the same time improving the
cytotoxic efficacy of the PE compared to substitutions with other
amino acids (see, for example, Examples 3, 5 and 6). Therefore, in
a preferred embodiment of the invention with respect to the
chimeric molecule, the substitution of one or more of amino acid
residues F443, L477, R494, and L552 is a substitution of histidine
in place of amino acid residue L477. The substitution of glutamic
acid or asparagine in place of amino acid residue L552 also leads
to further improved toxicity while reducing T cell responses. In a
preferred embodiment of the invention with respect to the chimeric
molecule, the substitution of one or more of amino acid residues
F443, L477, R494, and L552 is a substitution of histidine in place
of amino acid residue L477 and a substitution of glutamic acid or
asparagine in place of amino acid residue L552. In an embodiment of
the invention with respect to the chimeric molecule, the
substitution of one or more of amino acid residues F443, L477,
R494, and L552 is a substitution of alanine in place of amino acid
residue F443; substitution of histidine in place of amino acid
residue L477; a substitution of alanine in place of amino acid
residue R494; and a substitution of glutamic acid or asparagine in
place of amino acid residue L552.
[0265] In a preferred embodiment of the invention with respect to
the chimeric molecule, the substitution of one or more of amino
acid residues F443, L477, R494, and L552 is a substitution of
alanine in place of amino acid residue F443; a substitution of
histidine in place of amino acid residue L477; a substitution of
alanine in place of amino acid residue R494; and a substitution of
glutamic acid in place of amino acid residue L552, the PE has an
arginine residue at position 458, and the further substitution of
an amino acid within one or more B-cell epitopes is: (a) a
substitution of alanine for amino acid residue R427 and (b) a
substitution of alanine for amino acid residue R505 as defined by
reference to SEQ ID NO: 1. In a preferred embodiment of the
invention, the PE of the chimeric molecule comprises the amino acid
sequence of SEQ ID NO: 289 (T18/T20).
[0266] In a preferred embodiment of the invention with respect to
the chimeric molecule, the substitution of one or more of amino
acid residues F443, L477, R494, and L552 is a substitution of
alanine in place of amino acid residue F443; a substitution of
histidine in place of amino acid residue L477; a substitution of
alanine in place of amino acid residue R494; and a substitution of
glutamic acid in place of amino acid residue L552, the PE has an
arginine residue at position 458, and the further substitution of
an amino acid within one or more B-cell epitopes is: (a) a
substitution of alanine for amino acid residue R427; (b) a
substitution of alanine for amino acid residue R456; (c) a
substitution of alanine for amino acid residue R463; (d) a
substitution of alanine for amino acid residue R467; (e) a
substitution of alanine for amino acid residue R490; (f) a
substitution of alanine for amino acid residue R505; and (g) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. In a preferred embodiment, the PE of the
chimeric molecule comprises the amino acid sequence of SEQ ID NO:
285 (T14-L010R+456A).
[0267] In a preferred embodiment of the invention with respect to
the chimeric molecule, the substitution of one or more of amino
acid residues F443, L477, R494, and L552 is a substitution of
alanine in place of amino acid residue F443; a substitution of
histidine in place of amino acid residue L477; a substitution of
alanine in place of amino acid residue R494; and a substitution of
asparagine in place of amino acid residue L552, the PE has an
arginine residue at position 458, and the further substitution of
an amino acid within one or more B-cell epitopes is: (a) a
substitution of alanine for amino acid residue R427; (b) a
substitution of alanine for amino acid residue R456; (c) a
substitution of alanine for amino acid residue R463; (d) a
substitution of alanine for amino acid residue R467; (e) a
substitution of alanine for amino acid residue R490; (f) a
substitution of alanine for amino acid residue R505; and (g) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. In a preferred embodiment, the PE of the
chimeric molecule comprises the amino acid sequence of SEQ ID NO:
286 (T15-L010R+456A).
[0268] In a preferred embodiment of the invention with respect to
the chimeric molecule, the substitution of one or more of amino
acid residues F443, L477, R494, and L552 is a substitution of
alanine in place of amino acid residue F443; a substitution of
histidine in place of amino acid residue L477; a substitution of
alanine in place of amino acid residue R494; and a substitution of
glutamic acid in place of amino acid residue L552, the PE has an
arginine residue at position 458, and the further substitution of
an amino acid within one or more B-cell epitopes is: (a) a
substitution of alanine for amino acid residue R427; (b) a
substitution of alanine for amino acid residue R463; (c) a
substitution of alanine for amino acid residue R467; (d) a
substitution of alanine for amino acid residue R490; (e) a
substitution of alanine for amino acid residue R505; and (f) a
substitution of alanine for amino acid residue R538; as defined by
reference to SEQ ID NO: 1. In a preferred embodiment, the PE of the
chimeric molecule comprises the amino acid sequence of SEQ ID NO:
287 (T14-L010R).
[0269] In a preferred embodiment of the invention within the
chimeric molecule, the substitution of one or more of amino acid
residues F443, L477, R494, and L552 is a substitution of alanine in
place of amino acid residue F443; a substitution of histidine in
place of amino acid residue L477; a substitution of alanine in
place of amino acid residue R494; and a substitution of asparagine
in place of amino acid residue L552, the PE has an arginine residue
at position 458, and the further substitution of an amino acid
within one or more B-cell epitopes is: (a) a substitution of
alanine for amino acid residue R427; (b) a substitution of alanine
for amino acid residue R463; (c) a substitution of alanine for
amino acid residue R467; (d) a substitution of alanine for amino
acid residue R490; (e) a substitution of alanine for amino acid
residue R505; and (f) a substitution of alanine for amino acid
residue R538; as defined by reference to SEQ ID NO: 1. In a
preferred embodiment, the PE of the chimeric molecule comprises the
amino acid sequence of SEQ ID NO: 288 (T15-L010R).
[0270] In a preferred embodiment with respect to the chimeric
molecule, the FCS=furin cleavage sequence (FCS) corresponding to
amino acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID
NO: 8)).
[0271] In a preferred embodiment with respect to the chimeric
molecule,
[0272] n=1 for R.sup.1 and R.sup.2,
[0273] R.sup.1=a linker of the amino acid sequence of SEQ ID NO:
282 (DKTHKASGG),
[0274] R.sup.2=a linker of the amino acid sequence of SEQ ID NO:
284 (GGGGGS), and
[0275] FCS=furin cleavage sequence (FCS) corresponding to amino
acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)).
In an especially preferred embodiment, n is 0 for R.sup.3.
[0276] In a preferred embodiment with respect to the chimeric
molecule, R.sup.1.sub.n--FCS--R.sup.2.sub.n=a linker of the amino
acid sequence of SEQ ID NO: 36 and the targeting moiety comprises
the Fab fragment of an antibody.
[0277] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-mesothelin antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 285 (T14-L010R+456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-mesothelin antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 45 and the variable light chain domain of SEQ ID
NO: 46.
[0278] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-mesothelin antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 286 (T15-L010R+456A). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-mesothelin antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 45 and the variable light chain domain of SEQ ID
NO: 46.
[0279] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-mesothelin antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 287 (T14-L010R). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-mesothelin antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 45 and the variable light chain domain of SEQ ID
NO: 46.
[0280] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-mesothelin antibody, a
linker comprising the amino acid sequence of SEQ ID NO: 36, and a
PE comprising SEQ ID NO: 288 (T15-L010R). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-mesothelin antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 45 and the variable light chain domain of SEQ ID
NO: 46.
[0281] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 289 (T18/T20). In a preferred embodiment, the
chimeric molecule comprises the antigen binding portion of an
anti-glypican-3 antibody, a linker comprising the amino acid
sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 289
(T18/T20). In a preferred embodiment, the antigen binding portion
is the Fab fragment of an anti-glypican-3 antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 61 (SEQ ID NOs: 65, 69, and 73, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 62
(SEQ ID NOs: 66, 70, and 74, respectively). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the CDR1, CDR2 and CDR3 of the
variable heavy chain domain VH of SEQ ID NO: 77 (SEQ ID NO: 81, 85,
and 89, respectively) and the CDR1, CDR2 and CDR3 of the variable
light chain domain of SEQ ID NO: 78 (SEQ ID NOs: 82, 86, and 90,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 61 and
the variable light chain domain of SEQ ID NO: 62. In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 77 and the variable light chain domain of SEQ ID
NO: 78.
[0282] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 285 (T14-L010R-E456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-glypican-3 antibody, a linker comprising the
amino acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID
NO: 285 (T14-L010R+456A). In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-glypican-3 antibody
comprising the CDR1, CDR2 and CDR3 of the variable heavy chain
domain VH of SEQ ID NO: 61 (SEQ ID NO: 65, 69, and 73,
respectively) and the CDR1, CDR2 and CDR3 of the variable light
chain domain of SEQ ID NO: 62 (SEQ ID NOs: 66, 70, and 74,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the CDR1, CDR2 and CDR3 of the variable heavy chain
domain VH of SEQ ID NO: 77 (SEQ ID NOs: 81, 85, and 89,
respectively) and the CDR1, CDR2 and CDR3 of the variable light
chain domain of SEQ ID NO: 78 (SEQ ID NOs: 82, 86, and 90,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 61 and
the variable light chain domain of SEQ ID NO: 62. In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 77 and the variable light chain domain of SEQ ID
NO: 78.
[0283] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 286 (T15-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-glypican-3 antibody, a linker comprising the
amino acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID
NO: 286 (T15-L010R+456A). In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-glypican-3 antibody
comprising the CDR1, CDR2 and CDR3 of the variable heavy chain
domain VH of SEQ ID NO: 61 (SEQ ID NO: 65, 69, and 73,
respectively) and the CDR1, CDR2 and CDR3 of the variable light
chain domain of SEQ ID NO: 62 (SEQ ID NOs: 66, 70, and 74,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the CDR1, CDR2 and CDR3 of the variable heavy chain
domain VH of SEQ ID NO: 77 (SEQ ID NOs: 81, 85, and 89,
respectively) and the CDR1, CDR2 and CDR3 of the variable light
chain domain of SEQ ID NO: 78 (SEQ ID NOs: 82, 86, and 90,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 61 and
the variable light chain domain of SEQ ID NO: 62. In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 77 and the variable light chain domain of SEQ ID
NO: 78.
[0284] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 287 (T14-L010R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-glypican-3 antibody, a linker comprising the amino acid
sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 287
(T14-LO-10R). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the CDR1, CDR2 and CDR3 of the variable heavy chain
domain VH of SEQ ID NO: 61 (SEQ ID NOs: 65, 69, and 73,
respectively) and the CDR1, CDR2 and CDR3 of the variable light
chain domain of SEQ ID NO: 62 (SEQ ID NOs: 66, 70, and 74,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the CDR1, CDR2 and CDR3 of the variable heavy chain
domain VH of SEQ ID NO: 77 (SEQ ID NOs: 81, 85, and 89,
respectively) and the CDR1, CDR2 and CDR3 of the variable light
chain domain of SEQ ID NO: 78 (SEQ ID NOs: 82, 86, and 90,
respectively). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-glypican-3 antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 61 and
the variable light chain domain of SEQ ID NO: 62. In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 77 and the variable light chain domain of SEQ ID
NO: 78.
[0285] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-glypican-3 antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 288 (T15-L010R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-glypican-3 antibody, a linker comprising the amino acid
sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 288
(T15-L010R). In a preferred embodiment, the antigen binding portion
is the Fab fragment of an anti-glypican-3 antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 61 (SEQ ID NOs: 65, 69, and 73, repsectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 62
(SEQ ID NOs: 66, 70, and 74, respectively). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the CDR1, CDR2 and CDR3 of the
variable heavy chain domain VH of SEQ ID NO: 77 (SEQ ID NOs: 81,
85, and 89, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 78 (SEQ ID NOs: 82, 86,
and 90, respectively). In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-glypican-3 antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 61 and
the variable light chain domain of SEQ ID NO: 62. In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-glypican-3 antibody comprising the variable heavy chain domain
VH of SEQ ID NO: 77 and the variable light chain domain of SEQ ID
NO: 78.
[0286] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-FAP antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 289 (T18/T20). In a preferred embodiment, the
chimeric molecule comprises the antigen binding portion of an
anti-FAP antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 289 (T18/T20). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-FAP antibody comprising the CDR1, CDR2 and CDR3
of the variable heavy chain domain VH of SEQ ID NO: 93 (SEQ ID NOs:
97, 101, and 105, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 94 (SEQ ID NOs: 98, 102,
and 106, respectively). In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-FAP antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 93 and
the variable light chain domain of SEQ ID NO: 94. In another
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-FAP antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 93 and the variable light chain
domain of SEQ ID NO: 290.
[0287] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-FAP antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 285 (T14-L010R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-FAP antibody, a linker comprising the amino acid
sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 285
(T14-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-FAP antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 93 (SEQ ID NOs: 97, 101, and 105, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 94
(SEQ ID NOs: 98, 102, and 106, respectively). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-FAP antibody comprising the variable heavy chain domain VH of
SEQ ID NO: 93 and the variable light chain domain of SEQ ID NO: 94.
In another preferred embodiment, the antigen binding portion is the
Fab fragment of an anti-FAP antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 93 and the variable light chain
domain of SEQ ID NO: 290.
[0288] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-FAP antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 286 (T15-L010R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-FAP antibody, a linker comprising the amino acid
sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 286
(T15-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-FAP antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 93 (SEQ ID NOs: 97, 101, and 105, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 94
(SEQ ID NOs: 98, 102, and 106, respectively). In a preferred
embodiment, the antigen binding portion is the Fab fragment of an
anti-FAP antibody comprising the variable heavy chain domain VH of
SEQ ID NO: 93 and the variable light chain domain of SEQ ID NO: 94.
In another preferred embodiment, the antigen binding portion is the
Fab fragment of an anti-FAP antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 93 and the variable light chain
domain of SEQ ID NO: 290.
[0289] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-FAP antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 287 (T14-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-FAP antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 287 (T14-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-FAP antibody comprising the CDR1, CDR2 and CDR3
of the variable heavy chain domain VH of SEQ ID NO: 93 (SEQ ID NOs:
97, 101, and 105, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 94 (SEQ ID NOs: 98, 102,
and 106,). In a preferred embodiment, the antigen binding portion
is the Fab fragment of an anti-FAP antibody comprising the variable
heavy chain domain VH of SEQ ID NO: 93 and the variable light chain
domain of SEQ ID NO: 94. In another preferred embodiment, the
antigen binding portion is the Fab fragment of an anti-FAP antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 93 and
the variable light chain domain of SEQ ID NO: 290.
[0290] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-FAP antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 288 (T15-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-FAP antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 288 (T15-LO10R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-FAP antibody comprising the CDR1, CDR2 and CDR3
of the variable heavy chain domain VH of SEQ ID NO: 93 (SEQ ID NOs:
97, 101, and 105, respectively) and the CDR1, CDR2 and CDR3 of the
variable light chain domain of SEQ ID NO: 94 (SEQ ID NOs: 98, 102,
and 106, respectively). In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-FAP antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 93 and
the variable light chain domain of SEQ ID NO: 94. In another
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-FAP antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 93 and the variable light chain
domain of SEQ ID NO: 290. In a preferred embodiment, the chimeric
molecule comprises the antigen binding portion of an anti-PSMA
antibody, a furin cleavage sequence (FCS) corresponding to amino
acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8))
and a PE comprising SEQ ID NO: 289 (T18/T20). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-PSMA antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 289
(T18/T20). In a preferred embodiment, the antigen binding portion
is the Fab fragment of an anti-PSMA antibody comprising the CDR1,
CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID NO:
109 (SEQ ID NOs: 113, 117, and 121, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 110
(SEQ ID NOs: 114, 118, and 122, respectively).
[0291] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-PSMA antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 285 (T14-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-PSMA antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 285
(T14-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-PSMA antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 109 (SEQ ID NOs: 113, 117, and 121, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 110
(SEQ ID NOs: 114, 118, and 122, respectively).
[0292] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-PSMA antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 286 (T15-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-PSMA antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 286
(T15-LO10R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-PSMA antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 109 (SEQ ID NOs: 113, 117, and 121, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 110
(SEQ ID NOs: 114, 118, and 122, respectively).
[0293] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-PSMA antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 287 (T14-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-PSMA antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 287 (T14-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-PSMA antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 109 (SEQ
ID NOs: 113, 117, and 121, repsectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 110 (SEQ ID
NOs: 114, 118, and 122, respectively).
[0294] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-PSMA antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 288 (T15-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-PSMA antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 288 (T15-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-PSMA antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 109 (SEQ
ID NOs: 113, 117, and 121, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 110 (SEQ ID
NOs: 114, 118, and 122, respectively).
[0295] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-CAIX antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 289 (T18/T20). In a preferred embodiment, the
chimeric molecule comprises the antigen binding portion of an
anti-CAIX antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 289 (T18/T20). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-CAIX antibody comprising the CDR', CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 125 (SEQ
ID NOs: 129, 133, and 137, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 126 (SEQ ID
NOs: 130, 134, and 138,).
[0296] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-CAIX antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 285 (T14-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-CAIX antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 285
(T14-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-CAIX antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 125 (SEQ ID NOs: 129, 133, and 137, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 126
(SEQ ID NOs: 130, 134, and 138, respectively).
[0297] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-CAIX antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 286 (T15-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-CAIX antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 286
(T15-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-CAIX antibody comprising the
CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of SEQ ID
NO: 125 (SEQ ID NOs: 129, 133, and 137, respectively) and the CDR1,
CDR2 and CDR3 of the variable light chain domain of SEQ ID NO: 126
(SEQ ID NOs: 130, 134, and 138, respectively).
[0298] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-CAIX antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 287 (T14-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-CAIX antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 287 (T14-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-CAIX antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 125 (SEQ
ID NOs: 129, 133, and 137, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 126 (SEQ ID
NOs: 130, 134, and 138, respectively).
[0299] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-CAIX antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 288 (T15-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-CAIX antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 288 (T15-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-CAIX antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 125 (SEQ
ID NOs: 129, 133, and 137, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 126 (SEQ ID
NOs: 130, 134, and 138, respectively). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-L1CAM antibody, a furin cleavage sequence (FCS) corresponding
to amino acid residues 274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID
NO: 8)) and a PE comprising SEQ ID NO: 289 (T18/T20). In a
preferred embodiment, the chimeric molecule comprises the antigen
binding portion of an anti-L1 CAM antibody, a linker comprising the
amino acid sequence of SEQ ID NO: 36, and aPE comprising. In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 141 (SEQ
ID NOs: 145, 149, and 153, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 142 (SEQ ID
NOs: 146, 150, and 154, respectively). In a preferred embodiment,
the antigen binding portion is the Fab fragment of an anti-L1 CAM
antibody comprising the variable heavy chain domain VH of SEQ ID
NO: 157 and the variable light chain domain of SEQ ID NO: 158. In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1 CAM antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 173 and the variable light chain
domain of SEQ ID NO: 174.
[0300] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-L1CAM antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 285 (T14-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-L1CAM antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 285
(T14-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-L1CAM antibody comprising
the CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of
SEQ ID NO: 141 (SEQ ID NOs: 145, 149, and 153, respectively) and
the CDR1, CDR2 and CDR3 of the variable light chain domain of SEQ
ID NO: 142 (SEQ ID NOs: 146, 150, and 154, respectively). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 157 and the variable light chain
domain of SEQ ID NO: 158. In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-L1CAM antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 173 and
the variable light chain domain of SEQ ID NO: 174.
[0301] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-L1CAM antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 286 (T15-LO10R+456A). In a preferred
embodiment, the chimeric molecule comprises the antigen binding
portion of an anti-L1CAM antibody, a linker comprising the amino
acid sequence of SEQ ID NO: 36, and a PE comprising SEQ ID NO: 286
(T15-L010R+456A). In a preferred embodiment, the antigen binding
portion is the Fab fragment of an anti-L1CAM antibody comprising
the CDR1, CDR2 and CDR3 of the variable heavy chain domain VH of
SEQ ID NO: 141 (SEQ ID NOs: 145, 149, and 153, respectively) and
the CDR1, CDR2 and CDR3 of the variable light chain domain of SEQ
ID NO: 142 (SEQ ID NOs: 146, 150, and 154, respectively). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 157 and the variable light chain
domain of SEQ ID NO: 158. In a preferred embodiment, the antigen
binding portion is the Fab fragment of an anti-L1CAM antibody
comprising the variable heavy chain domain VH of SEQ ID NO: 173 and
the variable light chain domain of SEQ ID NO: 174.
[0302] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-L1CAM antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 287 (T14-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-L1CAM antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 287 (T14-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 141 (SEQ
ID NOs: 145, 149, and 153, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 142 (SEQ ID
NOs: 146, 150, and 154, respectively). In a preferred embodiment,
the antigen binding portion is the Fab fragment of an anti-L1CAM
antibody comprising the variable heavy chain domain VH of SEQ ID
NO: 157 and the variable light chain domain of SEQ ID NO: 158. In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 173 and the variable light chain
domain of SEQ ID NO: 174.
[0303] In a preferred embodiment, the chimeric molecule comprises
the antigen binding portion of an anti-L1CAM antibody, a furin
cleavage sequence (FCS) corresponding to amino acid residues
274-284 of SEQ ID NO: 1 (RHRQPRGWEQL (SEQ ID NO: 8)) and a PE
comprising SEQ ID NO: 288 (T15-LO10R). In a preferred embodiment,
the chimeric molecule comprises the antigen binding portion of an
anti-L1CAM antibody, a linker comprising the amino acid sequence of
SEQ ID NO: 36, and a PE comprising SEQ ID NO: 288 (T15-L010R). In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the CDR1, CDR2 and
CDR3 of the variable heavy chain domain VH of SEQ ID NO: 141 (SEQ
ID NOs: 145, 149, and 153, respectively) and the CDR1, CDR2 and
CDR3 of the variable light chain domain of SEQ ID NO: 142 (SEQ ID
NOs: 146, 150, and 154, respectively). In a preferred embodiment,
the antigen binding portion is the Fab fragment of an anti-L1CAM
antibody comprising the variable heavy chain domain VH of SEQ ID
NO: 157 and the variable light chain domain of SEQ ID NO: 158. In a
preferred embodiment, the antigen binding portion is the Fab
fragment of an anti-L1CAM antibody comprising the variable heavy
chain domain VH of SEQ ID NO: 173 and the variable light chain
domain of SEQ ID NO: 174. Included in the scope of the invention
are functional portions of the inventive PEs and chimeric molecules
described herein. The term "functional portion" when used in
reference to a PE or chimeric molecule refers to any part or
fragment of the PE or chimeric molecule of the invention, which
part or fragment retains the biological activity of the PE or
chimeric molecule of which it is a part (the parent PE or chimeric
molecule). Functional portions encompass, for example, those parts
of a PE or chimeric molecule that retain the ability to
specifically bind to and destroy or inhibit the growth of target
cells or treat or prevent cancer, to a similar extent, the same
extent, or to a higher extent, as the parent PE or chimeric
molecule. In reference to the parent PE or chimeric molecule, the
functional portion can comprise, for instance, about 10% or more,
about 25% or more, about 30% or more, about 50% or more, about 68%
or more, about 80% or more, about 90% or more, or about 95% or
more, of the parent PE or chimeric molecule.
[0304] The functional portion can comprise additional amino acids
at the amino or carboxy terminus of the portion, or at both
termini, which additional amino acids are not found in the amino
acid sequence of the parent PE or chimeric molecule. Desirably, the
additional amino acids do not interfere with the biological
function of the functional portion, e.g., specifically binding to
and destroying or inhibiting the growth of target cells, having the
ability to treat or prevent cancer, etc. More desirably, the
additional amino acids enhance the biological activity, as compared
to the biological activity of the parent PE or chimeric
molecule.
[0305] Included in the scope of the invention are functional
variants of the inventive PEs and chimeric molecules described
herein. The term "functional variant" as used herein refers to a PE
or chimeric molecule having substantial or significant sequence
identity or similarity to a parent PE or chimeric molecule, which
functional variant retains the biological activity of the PE or
chimeric molecule of which it is a variant. Functional variants
encompass, for example, those variants of the PE or chimeric
molecule described herein (the parent PE or chimeric molecule) that
retain the ability to specifically bind to and destroy or inhibit
the growth of target cells to a similar extent, the same extent, or
to a higher extent, as the parent PE or chimeric molecule. In
reference to the parent PE or chimeric molecule, the functional
variant can, for instance, be about 30% or more, about 50% or more,
about 75% or more, about 80% or more, about 90% or more, about 95%
or more, about 96% or more, about 97% or more, about 98% or more,
or about 99% or more identical in amino acid sequence to the parent
PE or chimeric molecule.
[0306] The functional variant can, for example, comprise the amino
acid sequence of the parent PE or chimeric molecule with at least
one conservative amino acid substitution. Conservative amino acid
substitutions are known in the art and include amino acid
substitutions in which one amino acid having certain chemical
and/or physical properties is exchanged for another amino acid that
has the same chemical or physical properties. For instance, the
conservative amino acid substitution can be an acidic amino acid
substituted for another acidic amino acid (e.g., Asp or Glu), an
amino acid with a nonpolar side chain substituted for another amino
acid with a nonpolar side chain (e.g., Ala, Gly, Val, Ile, Leu,
Met, Phe, Pro, Trp, Val, etc.), a basic amino acid substituted for
another basic amino acid (Lys, Arg, etc.), an amino acid with a
polar side chain substituted for another amino acid with a polar
side chain (Asn, Cys, Gln, Ser, Thr, Tyr, etc.), etc.
[0307] Alternatively or additionally, the functional variants can
comprise the amino acid sequence of the parent PE or chimeric
molecule with at least one non-conservative amino acid
substitution. In this case, it is preferable for the
non-conservative amino acid substitution to not interfere with or
inhibit the biological activity of the functional variant.
Preferably, the non-conservative amino acid substitution enhances
the biological activity of the functional variant, such that the
biological activity of the functional variant is increased as
compared to the parent PE or chimeric molecule.
[0308] The PE or chimeric molecule of the invention can consist
essentially of the specified amino acid sequence or sequences
described herein, such that other components of the functional
variant, e.g., other amino acids, do not materially change the
biological activity of the functional variant.
[0309] The PE or chimeric molecule of the invention (including
functional portions and functional variants) of the invention can
comprise synthetic amino acids in place of one or more
naturally-occurring amino acids. Such synthetic amino acids are
known in the art and include, for example, aminocyclohexane
carboxylic acid, norleucine, .alpha.-amino n-decanoic acid,
homoserine, S-acetyl aminomethyl-cysteine, trans-3- and
trans-4-hydroxyproline, 4-aminophenylalanine, 4-nitrophenylalanine,
4-chlorophenylalanine, 4-carboxyphenylalanine, .beta.-phenylserine
.beta.-hydroxyphenylalanine, phenylglycine,
.alpha.-naphthylalanine, cyclohexylalanine, cyclohexylglycine,
indoline-2-carboxylic acid,
1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid, aminomalonic
acid, aminomalonic acid monoamide, N'-benzyl-N'-methyl-lysine,
N',N'-dibenzyl-lysine, 6-hydroxylysine, ornithine,
.alpha.-aminocyclopentane carboxylic acid, .alpha.-aminocyclohexane
carboxylic acid, .alpha.-aminocycloheptane carboxylic acid,
.alpha.-(2-amino-2-norbornane)-carboxylic acid,
.alpha.,.gamma.-diaminobutyric acid,
.alpha.,.beta.-diaminopropionic acid, homophenylalanine, and
.alpha.-tert-butylglycine.
[0310] The PE or chimeric molecule of the invention (including
functional portions and functional variants) can be glycosylated,
amidated, carboxylated, phosphorylated, esterified, N-acylated,
cyclized via, e.g., a disulfide bridge, or converted into an acid
addition salt and/or optionally dimerized or polymerized, or
conjugated.
[0311] An embodiment of the invention provides a method of
producing the inventive PE comprising (a) recombinantly expressing
the PE and (b) purifying the PE. The PEs and chimeric molecules of
the invention (including functional portions and functional
variants) can be obtained by methods of producing proteins and
polypeptides known in the art. Suitable methods of de novo
synthesizing polypeptides and proteins are described in references,
such as Chan et al., Fmoc Solid Phase Peptide Synthesis, Oxford
University Press, Oxford, United Kingdom, 2005; Peptide and Protein
Drug Analysis, ed. Reid, R., Marcel Dekker, Inc., 2000; Epitope
Mapping, ed. Westwood et al., Oxford University Press, Oxford,
United Kingdom, 2000; and U.S. Pat. No. 5,449,752. Also, the PEs
and chimeric molecules of the invention can be recombinantly
expressed using the nucleic acids described herein using standard
recombinant methods. See, for instance, Sambrook et al., Molecular
Cloning: A Laboratory Manual, 3.sup.rd ed., Cold Spring Harbor
Press, Cold Spring Harbor, N.Y. 2001; and Ausubel et al., Current
Protocols in Molecular Biology, Greene Publishing Associates and
John Wiley & Sons, N Y, 1994.
[0312] The method further comprises purifying the PE. Once
expressed, the inventive PEs may be purified in accordance with
purification techniques known in the art. Exemplary purification
techniques include, but are not limited to, ammonium sulfate
precipitation, affinity columns, and column chromatography, or by
procedures described in, e.g., R. Scopes, Protein Purification,
Springer-Verlag, NY (1982).
[0313] Another embodiment of the invention provides a method of
producing the inventive chimeric molecule comprising (a)
recombinantly expressing the chimeric molecule and (b) purifying
the chimeric molecule. The chimeric molecule may be recombinantly
expressed and purified as described herein with respect to other
aspects of the invention. In an embodiment of the invention,
recombinantly expressing the chimeric molecule comprises inserting
a nucleotide sequence encoding a targeting moiety and a nucleotide
sequence encoding a PE into a vector. The method may comprise
inserting the nucleotide sequence encoding the targeting moiety and
the nucleotide sequence encoding the PE in frame so that it encodes
one continuous polypeptide including a functional targeting moiety
region and a functional PE region. In an embodiment of the
invention, the method comprises ligating a nucleotide sequence
encoding the PE to a nucleotide sequence encoding a targeting
moiety so that, upon expression, the PE is located at the carboxyl
terminus of the targeting moiety. In an alternative embodiment, the
method comprises ligating a nucleotide sequence encoding the PE to
a nucleotide sequence encoding a targeting moiety so that, upon
expression, the PE is located at the amino terminus of the
targeting moiety.
[0314] Still another embodiment of the invention provides a method
of producing the inventive chimeric molecule comprising (a)
recombinantly expressing the inventive PE, (b) purifying the PE,
and (c) covalently linking a targeting moiety to the purified PE.
The inventive PE may be recombinantly expressed as described herein
with respect to other aspects of the invention. The method further
comprises covalently linking a targeting moiety to the purified PE.
The method of attaching a PE to a targeting moiety may vary
according to the chemical structure of the targeting moiety. For
example, the method may comprise reacting any one or more of a
variety of functional groups e.g., carboxylic acid (COOH), free
amine (--NH.sub.2), or sulfhydryl (--SH) groups present on the PE
with a suitable functional group on the targeting moiety, thereby
forming a covalent bind between the PE and the targeting moiety.
Alternatively or additionally, the method may comprise derivatizing
the targeting moiety or PE to expose or to attach additional
reactive functional groups. Derivatizing may also include attaching
one or more linkers to the targeting moiety or PE.
[0315] In another embodiment of the invention, the inventive PEs
and chimeric molecules may be produced using non-recombinant
methods. For example, the inventive PEs and chimeric molecules
described herein (including functional portions and functional
variants) can be commercially synthesized by companies, such as
Synpep (Dublin, Calif.), Peptide Technologies Corp. (Gaithersburg,
Md.), and Multiple Peptide Systems (San Diego, Calif.). In this
respect, the inventive PEs and chimeric molecules can be synthetic,
recombinant, isolated, and/or purified.
[0316] It may be desirable, in some circumstances, to free the PE
from the targeting moiety when the chimeric molecule has reached
one or more target cells. In this regard, the inventive chimeric
molecules may comprise a cleavable linker. The linker may be
cleavable by any suitable means, e.g., enzymatically. For example,
when the target cell is a cancer (e.g., tumor) cell, the chimeric
molecule may include a linker cleavable under conditions present at
the tumor site (e.g., when exposed to tumor-associated enzymes or
acidic pH).
[0317] An embodiment of the invention provides a nucleic acid
comprising a nucleotide sequence encoding any of the inventive PEs
or the inventive chimeric molecules described herein. The term
"nucleic acid," as used herein, includes "polynucleotide,"
"oligonucleotide," and "nucleic acid molecule," and generally means
a polymer of DNA or RNA, which can be single-stranded or
double-stranded, which can be synthesized or obtained (e.g.,
isolated and/or purified) from natural sources, which can contain
natural, non-natural or altered nucleotides, and which can contain
a natural, non-natural, or altered internucleotide linkage, such as
a phosphoroamidate linkage or a phosphorothioate linkage, instead
of the phosphodiester found between the nucleotides of an
unmodified oligonucleotide. It is generally preferred that the
nucleic acid does not comprise any insertions, deletions,
inversions, and/or substitutions. However, it may be suitable in
some instances, as discussed herein, for the nucleic acid to
comprise one or more insertions, deletions, inversions, and/or
substitutions.
[0318] Preferably, the nucleic acids of the invention are
recombinant. As used herein, the term "recombinant" refers to (i)
molecules that are constructed outside living cells by joining
natural or synthetic nucleic acid segments, or (ii) molecules that
result from the replication of those described in (i) above. For
purposes herein, the replication can be in vitro replication or in
vivo replication.
[0319] The nucleic acids can be constructed based on chemical
synthesis and/or enzymatic ligation reactions using procedures
known in the art. See, for example, Sambrook et al., supra, and
Ausubel et al., supra. For example, a nucleic acid can be
chemically synthesized using naturally occurring nucleotides or
variously modified nucleotides designed to increase the biological
stability of the molecules or to increase the physical stability of
the duplex formed upon hybridization (e.g., phosphorothioate
derivatives and acridine substituted nucleotides). Examples of
modified nucleotides that can be used to generate the nucleic acids
include, but are not limited to, 5-fluorouracil, 5-bromouracil,
5-chlorouracil, 5-iodouracil, hypoxanthine, xanthine,
4-acetylcytosine, 5-(carboxyhydroxymethyl) uracil,
5-carboxymethylaminomethyl-2-thiouridine,
5-carboxymethylaminomethyluracil, dihydrouracil,
beta-D-galactosylqueosine, inosine, N.sup.6-isopentenyladenine,
1-methylguanine, 1-methyl inosine, 2,2-dimethyl guanine, 2-methyl
adenine, 2-methylguanine, 3-methyl cytosine, 5-methyl cytosine,
N.sup.6-substituted adenine, 7-methylguanine,
5-methylaminomethyluracil, 5-methoxyaminomethyl-2-thiouracil,
beta-D-mannosylqueosine, 5'-methoxycarboxymethyluracil,
5-methoxyuracil, 2-methylthio-N.sup.6-isopentenyladenine,
uracil-5-oxyacetic acid (v), wybutoxosine, pseudouracil, queosine,
2-thiocytosine, 5-methyl-2-thiouracil, 2-thiouracil, 4-thiouracil,
5-methyluracil, uracil-5-oxyacetic acid methylester,
3-(3-amino-3-N-2-carboxypropyl) uracil, and 2,6-diaminopurine.
Alternatively, one or more of the nucleic acids of the invention
can be purchased from companies, such as Macromolecular Resources
(Fort Collins, Colo.) and Synthegen (Houston, Tex.).
[0320] The invention also provides a nucleic acid comprising a
nucleotide sequence which is complementary to the nucleotide
sequence of any of the nucleic acids described herein or a
nucleotide sequence which hybridizes under stringent conditions to
the nucleotide sequence of any of the nucleic acids described
herein.
[0321] The nucleotide sequence which hybridizes under stringent
conditions preferably hybridizes under high stringency conditions.
By "high stringency conditions" is meant that the nucleotide
sequence specifically hybridizes to a target sequence (the
nucleotide sequence of any of the nucleic acids described herein)
in an amount that is detectably stronger than non-specific
hybridization. High stringency conditions include conditions which
would distinguish a polynucleotide with an exact complementary
sequence, or one containing only a few scattered mismatches, from a
random sequence that happened to have only a few small regions
(e.g., 3-10 bases) that matched the nucleotide sequence. Such small
regions of complementarity are more easily melted than a
full-length complement of 14-17 or more bases, and high stringency
hybridization makes them easily distinguishable. Relatively high
stringency conditions would include, for example, low salt and/or
high temperature conditions, such as provided by about 0.02-0.1 M
NaCl or the equivalent, at temperatures of about 50-70.degree. C.
Such high stringency conditions tolerate little, if any, mismatch
between the nucleotide sequence and the template or target strand,
and are particularly suitable for detecting expression of any of
the inventive PEs or chimeric molecules. It is generally
appreciated that conditions can be rendered more stringent by the
addition of increasing amounts of formamide.
[0322] The invention also provides a nucleic acid comprising a
nucleotide sequence that is about 70% or more, e.g., about 80% or
more, about 90% or more, about 91% or more, about 92% or more,
about 93% or more, about 94% or more, about 95% or more, about 96%
or more, about 97% or more, about 98% or more, or about 99% or more
identical to any of the nucleic acids described herein.
[0323] The nucleic acids of the invention can be incorporated into
a recombinant expression vector. In this regard, the invention
provides recombinant expression vectors comprising any of the
nucleic acids of the invention. For purposes herein, the term
"recombinant expression vector" means a genetically-modified
oligonucleotide or polynucleotide construct that permits the
expression of an mRNA, protein, polypeptide, or peptide by a host
cell, when the construct comprises a nucleotide sequence encoding
the mRNA, protein, polypeptide, or peptide, and the vector is
contacted with the cell under conditions sufficient to have the
mRNA, protein, polypeptide, or peptide expressed within the cell.
The vectors of the invention are not naturally-occurring as a
whole. However, parts of the vectors can be naturally-occurring.
The inventive recombinant expression vectors can comprise any type
of nucleotides, including, but not limited to DNA and RNA, which
can be single-stranded or double-stranded, which can be synthesized
or obtained in part from natural sources, and which can contain
natural, non-natural or altered nucleotides. The recombinant
expression vectors can comprise naturally-occurring,
non-naturally-occurring internucleotide linkages, or both types of
linkages. Preferably, the non-naturally occurring or altered
nucleotides or internucleotide linkages does not hinder the
transcription or replication of the vector.
[0324] The recombinant expression vector of the invention can be
any suitable recombinant expression vector, and can be used to
transform or transfect any suitable host cell. Suitable vectors
include those designed for propagation and expansion or for
expression or for both, such as plasmids and viruses. The vector
can be selected from the group consisting of the pUC series
(Fermentas Life Sciences), the pBluescript series (Stratagene,
LaJolla, Calif.), the pET series (Novagen, Madison, Wis.), the pGEX
series (Pharmacia Biotech, Uppsala, Sweden), and the pEX series
(Clontech, Palo Alto, Calif.). Bacteriophage vectors, such as
.lamda.GT10, .lamda.GT11, .lamda.ZapII (Stratagene), .lamda.EMBL4,
and .lamda.NM1149, also can be used. Examples of plant expression
vectors include pBI01, pBI101.2, pBI101.3, pBI121 and pBIN19
(Clontech). Examples of animal expression vectors include pEUK-C1,
pMAM, and pMAMneo (Clontech). Preferably, the recombinant
expression vector is a viral vector, e.g., a retroviral vector.
[0325] The recombinant expression vectors of the invention can be
prepared using standard recombinant DNA techniques described in,
for example, Sambrook et al., supra, and Ausubel et al., supra.
Constructs of expression vectors, which are circular or linear, can
be prepared to contain a replication system functional in a
prokaryotic or eukaryotic host cell. Replication systems can be
derived, e.g., from ColEl, 2.mu. plasmid, .lamda., SV40, bovine
papilloma virus, and the like.
[0326] Desirably, the recombinant expression vector comprises
regulatory sequences, such as transcription and translation
initiation and termination codons, which are specific to the type
of host (e.g., bacterium, fungus, plant, or animal) into which the
vector is to be introduced, as appropriate and taking into
consideration whether the vector is DNA- or RNA-based.
[0327] The recombinant expression vector can include one or more
marker genes, which allow for selection of transformed or
transfected hosts. Marker genes include biocide resistance, e.g.,
resistance to antibiotics, heavy metals, etc., complementation in
an auxotrophic host to provide prototrophy, and the like. Suitable
marker genes for the inventive expression vectors include, for
instance, neomycin/G418 resistance genes, hygromycin resistance
genes, histidinol resistance genes, tetracycline resistance genes,
and ampicillin resistance genes.
[0328] The recombinant expression vector can comprise a native or
nonnative promoter operably linked to the nucleotide sequence
encoding the inventive PE or chimeric molecule (including
functional portions and functional variants), or to the nucleotide
sequence which is complementary to or which hybridizes to the
nucleotide sequence encoding the PE or chimeric molecule. The
selection of promoters, e.g., strong, weak, inducible,
tissue-specific, and developmental-specific, is within the ordinary
skill of the artisan. Similarly, the combining of a nucleotide
sequence with a promoter is also within the ordinary skill of the
artisan. The promoter can be a non-viral promoter or a viral
promoter, e.g., a cytomegalovirus (CMV) promoter, an SV40 promoter,
an RSV promoter, or a promoter found in the long-terminal repeat of
the murine stem cell virus.
[0329] The inventive recombinant expression vectors can be designed
for either transient expression, for stable expression, or for
both. Also, the recombinant expression vectors can be made for
constitutive expression or for inducible expression.
[0330] Another embodiment of the invention further provides a host
cell comprising any of the recombinant expression vectors described
herein. As used herein, the term "host cell" refers to any type of
cell that can contain the inventive recombinant expression vector.
The host cell can be a eukaryotic cell, e.g., plant, animal, fungi,
or algae, or can be a prokaryotic cell, e.g., bacteria or protozoa.
The host cell can be a cultured cell, an adherent cell or a
suspended cell, i.e., a cell that grows in suspension. For purposes
of producing a recombinant inventive PE or chimeric molecule, the
host cell is preferably a prokaryotic cell, e.g., an E. coli
cell.
[0331] Also provided by the invention is a population of cells
comprising at least one host cell described herein. The population
of cells can be a heterogeneous population comprising the host cell
comprising any of the recombinant expression vectors described, in
addition to at least one other cell, e.g., a host cell which does
not comprise any of the recombinant expression vectors.
Alternatively, the population of cells can be a substantially
homogeneous population, in which the population comprises mainly
(e.g., consisting essentially of) host cells comprising the
recombinant expression vector. The population also can be a clonal
population of cells, in which all cells of the population are
clones of a single host cell comprising a recombinant expression
vector, such that all cells of the population comprise the
recombinant expression vector. In one embodiment of the invention,
the population of cells is a clonal population of host cells
comprising a recombinant expression vector as described herein.
[0332] The inventive PEs, chimeric molecules (including functional
portions and functional variants), nucleic acids, recombinant
expression vectors, host cells (including populations thereof), and
populations of cells can be isolated and/or purified. The term
"isolated" as used herein means having been removed from its
natural environment. The term "purified" as used herein means
having been increased in purity, wherein "purity" is a relative
term, and not to be necessarily construed as absolute purity. For
example, the purity can be about 50% or more, about 60% or more,
about 70% or more, about 80% or more, about 90% or more, or about
100%. The purity preferably is about 90% or more (e.g., about 90%
to about 95%) and more preferably about 98% or more (e.g., about
98% to about 99%).
[0333] The inventive PEs, chimeric molecules (including functional
portions and functional variants), nucleic acids, recombinant
expression vectors, host cells (including populations thereof), and
populations of cells, all of which are collectively referred to as
"inventive PE materials" hereinafter, can be formulated into a
composition, such as a pharmaceutical composition. In this regard,
the invention provides a pharmaceutical composition comprising any
of the PEs, chimeric molecules (including functional portions and
functional variants), nucleic acids, recombinant expression
vectors, host cells (including populations thereof), and
populations of cells, and a pharmaceutically acceptable carrier.
The inventive pharmaceutical composition containing any of the
inventive PE materials can comprise more than one inventive PE
material, e.g., a polypeptide and a nucleic acid, or two or more
different PEs. Alternatively, the pharmaceutical composition can
comprise an inventive PE material in combination with one or more
other pharmaceutically active agents or drugs, such as a
chemotherapeutic agents, e.g., asparaginase, busulfan, carboplatin,
cisplatin, daunorubicin, doxorubicin, fluorouracil, gemcitabine,
hydroxyurea, methotrexate, paclitaxel, rituximab, vinblastine,
vincristine, etc.
[0334] Preferably, the carrier is a pharmaceutically acceptable
carrier. With respect to pharmaceutical compositions, the carrier
can be any of those conventionally used and is limited only by
chemico-physical considerations, such as solubility and lack of
reactivity with the active compound(s), and by the route of
administration. The pharmaceutically acceptable carriers described
herein, for example, vehicles, adjuvants, excipients, and diluents,
are well-known to those skilled in the art and are readily
available to the public. It is preferred that the pharmaceutically
acceptable carrier be one which is chemically inert to the active
agent(s) and one which has no detrimental side effects or toxicity
under the conditions of use.
[0335] The choice of carrier will be determined in part by the
particular inventive PE material, as well as by the particular
method used to administer the inventive PE material. Accordingly,
there are a variety of suitable formulations of the pharmaceutical
composition of the invention. The following formulations for
parenteral (e.g., subcutaneous, intravenous, intraarterial,
intramuscular, intradermal, interperitoneal, and intrathecal),
oral, and aerosol administration are exemplary and are in no way
limiting. More than one route can be used to administer the
inventive PE materials, and in certain instances, a particular
route can provide a more immediate and more effective response than
another route.
[0336] Topical formulations are well-known to those of skill in the
art. Such formulations are particularly suitable in the context of
the invention for application to the skin.
[0337] Formulations suitable for oral administration can include
(a) liquid solutions, such as an effective amount of the inventive
PE material dissolved in diluents, such as water, saline, or orange
juice; (b) capsules, sachets, tablets, lozenges, and troches, each
containing a predetermined amount of the active ingredient, as
solids or granules; (c) powders; (d) suspensions in an appropriate
liquid; and (e) suitable emulsions. Liquid formulations may include
diluents, such as water and alcohols, for example, ethanol, benzyl
alcohol, and the polyethylene alcohols, either with or without the
addition of a pharmaceutically acceptable surfactant. Capsule forms
can be of the ordinary hard- or soft-shelled gelatin type
containing, for example, surfactants, lubricants, and inert
fillers, such as lactose, sucrose, calcium phosphate, and corn
starch. Tablet forms can include one or more of lactose, sucrose,
mannitol, corn starch, potato starch, alginic acid,
microcrystalline cellulose, acacia, gelatin, guar gum, colloidal
silicon dioxide, croscarmellose sodium, talc, magnesium stearate,
calcium stearate, zinc stearate, stearic acid, and other
excipients, colorants, diluents, buffering agents, disintegrating
agents, moistening agents, preservatives, flavoring agents, and
other pharmacologically compatible excipients. Lozenge forms can
comprise the inventive PE material in a flavor, usually sucrose and
acacia or tragacanth, as well as pastilles comprising the inventive
PE material in an inert base, such as gelatin and glycerin, or
sucrose and acacia, emulsions, gels, and the like additionally
containing such excipients as are known in the art.
[0338] The inventive PE material, alone or in combination with
other suitable components, can be made into aerosol formulations to
be administered via inhalation. These aerosol formulations can be
placed into pressurized acceptable propellants, such as
dichlorodifluoromethane, propane, nitrogen, and the like. The
aerosol formulations also may be formulated as pharmaceuticals for
non-pressured preparations, such as in a nebulizer or an atomizer.
Such spray formulations also may be used to spray mucosa.
[0339] Formulations suitable for parenteral administration include
aqueous and non-aqueous, isotonic sterile injection solutions,
which can contain anti-oxidants, buffers, bacteriostats, and
solutes that render the formulation isotonic with the blood of the
intended recipient, and aqueous and non-aqueous sterile suspensions
that can include suspending agents, solubilizers, thickening
agents, stabilizers, and preservatives. The inventive PE material
can be administered in a physiologically acceptable diluent in a
pharmaceutical carrier, such as a sterile liquid or mixture of
liquids, including water, saline, aqueous dextrose and related
sugar solutions, an alcohol, such as ethanol or hexadecyl alcohol,
a glycol, such as propylene glycol or polyethylene glycol,
dimethylsulfoxide, glycerol, ketals such as
2,2-dimethyl-1,3-dioxolane-4-methanol, ethers, poly(ethyleneglycol)
400, oils, fatty acids, fatty acid esters or glycerides, or
acetylated fatty acid glycerides with or without the addition of a
pharmaceutically acceptable surfactant, such as a soap or a
detergent, suspending agent, such as pectin, carbomers,
methylcellulose, hydroxypropylmethylcellulose, or
carboxymethylcellulose, or emulsifying agents and other
pharmaceutical adjuvants.
[0340] Oils, which can be used in parenteral formulations include
petroleum, animal, vegetable, or synthetic oils. Specific examples
of oils include peanut, soybean, sesame, cottonseed, corn, olive,
petrolatum, and mineral. Suitable fatty acids for use in parenteral
formulations include oleic acid, stearic acid, and isostearic acid.
Ethyl oleate and isopropyl myristate are examples of suitable fatty
acid esters.
[0341] Suitable soaps for use in parenteral formulations include
fatty alkali metal, ammonium, and triethanolamine salts, and
suitable detergents include (a) cationic detergents such as, for
example, dimethyl dialkyl ammonium halides, and alkyl pyridinium
halides, (b) anionic detergents such as, for example, alkyl, aryl,
and olefin sulfonates, alkyl, olefin, ether, and monoglyceride
sulfates, and sulfosuccinates, (c) nonionic detergents such as, for
example, fatty amine oxides, fatty acid alkanolamides, and
polyoxyethylenepolypropylene copolymers, (d) amphoteric detergents
such as, for example, alkyl-.beta.-aminopropionates, and
2-alkyl-imidazoline quaternary ammonium salts, and (e) mixtures
thereof.
[0342] The parenteral formulations will typically contain from
about 0.5% to about 25% by weight of the inventive PE material in
solution. Preservatives and buffers may be used. In order to
minimize or eliminate irritation at the site of injection, such
compositions may contain one or more nonionic surfactants having a
hydrophile-lipophile balance (HLB) of from about 12 to about 17.
The quantity of surfactant in such formulations will typically
range from about 5% to about 15% by weight. Suitable surfactants
include polyethylene glycol sorbitan fatty acid esters, such as
sorbitan monooleate and the high molecular weight adducts of
ethylene oxide with a hydrophobic base, formed by the condensation
of propylene oxide with propylene glycol. The parenteral
formulations can be presented in unit-dose or multi-dose sealed
containers, such as ampoules and vials, and can be stored in a
freeze-dried (lyophilized) condition requiring only the addition of
the sterile liquid excipient, for example, water, for injections,
immediately prior to use. Extemporaneous injection solutions and
suspensions can be prepared from sterile powders, granules, and
tablets of the kind previously described. The requirements for
effective pharmaceutical carriers for parenteral compositions are
well-known to those of ordinary skill in the art (see, e.g.,
Pharmaceutics and Pharmacy Practice, J. B. Lippincott Company,
Philadelphia, Pa., Banker and Chalmers, eds., pages 238-250 (1982),
and ASHP Handbook on Injectable Drugs, Toissel, 4th ed., pages
622-630 (1986)).
[0343] It will be appreciated by one of skill in the art that, in
addition to the above-described pharmaceutical compositions, the
inventive PE materials of the invention can be formulated as
inclusion complexes, such as cyclodextrin inclusion complexes, or
liposomes.
[0344] For purposes of the invention, the amount or dose of the
inventive PE material administered should be sufficient to effect a
desired response, e.g., a therapeutic or prophylactic response, in
the mammal over a reasonable time frame. For example, the dose of
the inventive PE material should be sufficient to inhibit growth of
a target cell or treat or prevent cancer in a period of from about
2 hours or longer, e.g., 12 to 24 or more hours, from the time of
administration. In certain embodiments, the time period could be
even longer. The dose will be determined by the efficacy of the
particular inventive PE material and the condition of the mammal
(e.g., human), as well as the body weight of the mammal (e.g.,
human) to be treated.
[0345] Many assays for determining an administered dose are known
in the art. An administered dose may be determined in vitro (e.g.,
cell cultures) or in vivo (e.g., animal studies). For example, an
administered dose may be determined by determining the IC.sub.50
(the dose that achieves a half-maximal inhibition of symptoms),
LD.sub.50 (the dose lethal to 50% of the population), the ED.sub.50
(the dose therapeutically effective in 50% of the population), and
the therapeutic index in cell culture and/or animal studies. The
therapeutic index is the ratio of LD.sub.50 to ED.sub.50 (i.e.,
LD.sub.50/ED.sub.50).
[0346] The dose of the inventive PE material also will be
determined by the existence, nature, and extent of any adverse side
effects that might accompany the administration of a particular
inventive PE material. Typically, the attending physician will
decide the dosage of the inventive PE material with which to treat
each individual patient, taking into consideration a variety of
factors, such as age, body weight, general health, diet, sex,
inventive PE material to be administered, route of administration,
and the severity of the condition being treated. By way of example
and not intending to limit the invention, the dose of the inventive
PE material can be about 0.001 to about 1000 mg/kg body weight of
the subject being treated/day, from about 0.01 to about 10 mg/kg
body weight/day, about 0.01 mg to about 1 mg/kg body weight/day,
from about 1 to about to about 1000 mg/kg body weight/day, from
about 5 to about 500 mg/kg body weight/day, from about 10 to about
250 mg/kg body weight/day, about 25 to about 150 mg/kg body
weight/day, or about 10 mg/kg body weight/day.
[0347] Alternatively, the inventive PE materials can be modified
into a depot form, such that the manner in which the inventive PE
material is released into the body to which it is administered is
controlled with respect to time and location within the body (see,
for example, U.S. Pat. No. 4,450,150). Depot forms of inventive PE
materials can be, for example, an implantable composition
comprising the inventive PE materials and a porous or non-porous
material, such as a polymer, wherein the inventive PE materials is
encapsulated by or diffused throughout the material and/or
degradation of the non-porous material. The depot is then implanted
into the desired location within the body and the inventive PE
materials are released from the implant at a predetermined
rate.
[0348] The inventive PE materials may be assayed for cytoxicity by
assays known in the art. Examples of cytotoxicity assays include a
WST assay, which measures cell proliferation using the tetrazolium
salt WST-1 (reagents and kits available from Roche Applied
Sciences), as described in International Patent Application
Publication WO 2011/032022.
[0349] It is contemplated that the inventive pharmaceutical
compositions, PEs, chimeric molecules, nucleic acids, recombinant
expression vectors, host cells, or populations of cells can be used
in methods of treating or preventing cancer. Without being bound by
a particular theory or mechanism, it is believed that the inventive
PEs destroy or inhibit the growth of cells through the inhibition
of protein synthesis in eukaryotic cells, e.g., by the inactivation
of the ADP-ribosylation of elongation factor 2 (EF-2). Without
being bound to a particular theory or mechanism, the inventive
chimeric molecules recognize and specifically bind to cell surface
markers, thereby delivering the cytotoxic PE to the population of
cells expressing the cell surface marker with minimal or no
cross-reactivity with cells that do not express the cell surface
marker. In this way, the cytoxicity of PE can be targeted to
destroy or inhibit the growth of a particular population of cells,
e.g., cancer cells. In this regard, the invention provides a method
of treating or preventing cancer in a mammal comprising
administering to the mammal any of the PEs, chimeric molecules,
nucleic acids, recombinant expression vectors, host cell,
population of cells, or pharmaceutical compositions described
herein, in an amount effective to treat or prevent cancer in the
mammal.
[0350] The terms "treat" and "prevent" as well as words stemming
therefrom, as used herein, do not necessarily imply 100% or
complete treatment or prevention. Rather, there are varying degrees
of treatment or prevention of which one of ordinary skill in the
art recognizes as having a potential benefit or therapeutic effect.
In this respect, the inventive methods can provide any amount of
any level of treatment or prevention of cancer in a mammal.
Furthermore, the treatment or prevention provided by the inventive
method can include treatment or prevention of one or more
conditions or symptoms of the disease, e.g., cancer, being treated
or prevented. Also, for purposes herein, "prevention" can encompass
delaying the onset of the disease, or a symptom or condition
thereof.
[0351] For purposes of the inventive methods, wherein host cells or
populations of cells are administered, the cells can be cells that
are allogeneic or autologous to the host. Preferably, the cells are
autologous to the host.
[0352] With respect to the inventive methods, the cancer can be any
cancer, including any of adrenal gland cancer, sarcomas (e.g.,
synovial sarcoma, osteogenic sarcoma, leiomyosarcoma uteri,
angiosarcoma, fibrosarcoma, rhabdomyosarcoma, liposarcoma, myxoma,
rhabdomyoma, fibroma, lipoma, and teratoma), lymphomas (e.g., small
lymphocytic lymphoma, Hodgkin lymphoma, and non-Hodgkin lymphoma),
hepatocellular carcinoma, glioma, head cancers (e.g., squamous cell
carcinoma), neck cancers (e.g., squamous cell carcinoma), acute
lymphocytic cancer, leukemias (e.g., hairy cell leukemia, myeloid
leukemia (acute and chronic), lymphatic leukemia (acute and
chronic), prolymphocytic leukemia (PLL), myelomonocytic leukemia
(acute and chronic), and lymphocytic leukemia (acute and chronic)),
bone cancer (osteogenic sarcoma, fibrosarcoma, malignant fibrous
histiocytoma, chondrosarcoma, Ewing's sarcoma, malignant lymphoma
(reticulum cell sarcoma), multiple myeloma, malignant giant cell
tumor, chordoma, osteochondroma (osteocartilaginous exostoses),
benign chondroma, chondroblastoma, chondromyxoid fibroma, osteoid
osteoma, and giant cell tumors), brain cancer (astrocytoma,
medulloblastoma, glioma, ependymoma, germinoma (pinealoma),
glioblastoma multiforme, oligodendroglioma, schwannoma, and
retinoblastoma), fallopian tube cancer, breast cancer, cancer of
the anus, anal canal, or anorectum, cancer of the eye, cancer of
the intrahepatic bile duct, cancer of the joints, cancer of the
neck, gallbladder, or pleura, cancer of the nose, nasal cavity, or
middle ear, cancer of the oral cavity, cancer of the vulva (e.g.,
squamous cell carcinoma, intraepithelial carcinoma, adenocarcinoma,
and fibrosarcoma), myeloproliferative disorders (e.g., chronic
myeloid cancer), colon cancers (e.g., colon carcinoma), esophageal
cancer (e.g., squamous cell carcinoma, adenocarcinoma,
leiomyosarcoma, and lymphoma), cervical cancer (cervical carcinoma
and pre-invasive cervical dysplasia), gastric cancer,
gastrointestinal carcinoid tumor, hypopharynx cancer, larynx
cancer, liver cancers (e.g., hepatocellular carcinoma,
cholangiocarcinoma, hepatoblastoma, angiosarcoma, hepatocellular
adenoma, and hemangioma), lung cancers (e.g., bronchogenic
carcinoma (squamous cell, undifferentiated small cell,
undifferentiated large cell, and adenocarcinoma), alveolar
(bronchiolar) carcinoma, bronchial adenoma, chondromatous
hamartoma, small cell lung cancer, non-small cell lung cancer, and
lung adenocarcinoma), mesothelioma, skin cancer (e.g., melanoma,
basal cell carcinoma, squamous cell carcinoma, Kaposi's sarcoma,
nevi, dysplastic nevi, lipoma, angioma, dermatofibroma, and
keloids), multiple myeloma, nasopharynx cancer, ovarian cancer
(e.g., ovarian carcinoma (serous cystadenocarcinoma, mucinous
cystadenocarcinoma, endometrioid carcinoma, and clear cell
adenocarcinoma), granulosa-theca cell tumors, Sertoli-Leydig cell
tumors, dysgerminoma, and malignant teratoma), pancreatic cancer
(e.g., ductal adenocarcinoma, insulinoma, glucagonoma, gastrinoma,
carcinoid tumors, and VlPoma), peritoneum, omentum, mesentery
cancer, pharynx cancer, prostate cancer (e.g., adenocarcinoma and
sarcoma), rectal cancer, kidney cancer (e.g., adenocarcinoma, Wilms
tumor (nephroblastoma), and renal cell carcinoma), small intestine
cancer (adenocarcinoma, lymphoma, carcinoid tumors, Kaposi's
sarcoma, leiomyoma, hemangioma, lipoma, neurofibroma, and fibroma),
soft tissue cancer, stomach cancer (e.g., carcinoma, lymphoma, and
leiomyosarcoma), testicular cancer (e.g., seminoma, teratoma,
embryonal carcinoma, teratocarcinoma, choriocarcinoma, sarcoma,
Leydig cell tumor, fibroma, fibroadenoma, adenomatoid tumors, and
lipoma), cancer of the uterus (e.g., endometrial carcinoma),
thyroid cancer, and urothelial cancers (e.g., squamous cell
carcinoma, transitional cell carcinoma, adenocarcinoma, ureter
cancer, and urinary bladder cancer).
[0353] As used herein, the term "mammal" refers to any mammal,
including, but not limited to, mammals of the order Rodentia, such
as mice and hamsters, and mammals of the order Logomorpha, such as
rabbits. It is preferred that the mammals are from the order
Carnivora, including Felines (cats) and Canines (dogs). It is more
preferred that the mammals are from the order Artiodactyla,
including Bovines (cows) and Swines (pigs) or of the order
Perssodactyla, including Equines (horses). It is most preferred
that the mammals are of the order Primates, Ceboids, or Simoids
(monkeys) or of the order Anthropoids (humans and apes). An
especially preferred mammal is the human.
[0354] Also provided is a method of inhibiting the growth of a
target cell comprising contacting the cell with the PE of any of
the PEs, chimeric molecules, nucleic acids, recombinant expression
vectors, host cell, population of cells, or pharmaceutical
compositions described herein, in an amount effective to inhibit
growth of the target cell. The growth of the target cell may be
inhibited by any amount, e.g., by about 10% or more, about 15% or
more, about 20% or more, about 25% or more, about 30% or more,
about 35% or more, about 40% or more, about 45% or more, about 50%
or more, about 55% or more, about 60% or more, about 65% or more,
about 70% or more, about 75% or more, about 80% or more, about 85%
or more, about 90% or more, about 95% or more, or about 100%. The
target cell may be provided in a biological sample. A biological
sample may be obtained from a mammal in any suitable manner and
from any suitable source. The biological sample may, for example,
be obtained by a blood draw, leukapheresis, and/or tumor biopsy or
necropsy. The contacting can take place in vitro or in vivo with
respect to the mammal. Preferably, the contacting is in vitro.
[0355] In an embodiment of the invention, the target cell is a
cancer cell. The target cell may be a cancer cell of any of the
cancers described herein. In an embodiment of the invention, the
target may express a cell surface marker. The cell surface marker
may be any cell surface marker described herein with respect to
other aspects of the invention. The cell surface marker may be, for
example, selected from the group consisting of CD19, CD21, CD22,
CD25, CD30, CD33, CD79b, transferrin receptor, EGF receptor,
mesothelin, cadherin, and Lewis Y.
[0356] The following examples further illustrate the invention but,
of course, should not be construed as in any way limiting its
scope.
Example 1
[0357] This example demonstrates the identification of T cell
epitopes in domain III of PE38.
[0358] To identify the T cell epitopes in PE38, peripheral blood
mononuclear cells (PBMCs) were first incubated with a recombinant
immunotoxin (RIT) for 14 days to allow the RIT to be processed by
donor APCs to relevant peptides to be presented to T cells. The
enriched PBMCs were subsequently exposed to a peptide library
composed of 111 partially overlapping peptides spanning the
sequence of PE38 and T cell activation was measured using an
ELISpot assay for interleukin-2 (IL-2).
[0359] Samples from 50 normal donors with no recorded previous
exposure to PE38 and with a broad distribution of human leukocyte
antigen (HLA) alleles were analyzed. The cells of this population
contained naive T cell epitope. Samples from nine mesothelioma and
seven hairy cell leukemia (HCL) patients that were previously
treated with PE-based RIT and who had developed high levels of
neutralizing antibodies were also analyzed. The cells of this
population contained memory T cell epitopes. The responses of the
naive donors and the previously treated patients are shown in a
heat map format in FIGS. 1A-1B.
[0360] FIG. 1A presents the positive and negative responses of the
50 naive donors. The responses are shown as a percentage of
responsive spots for each donor. The strongest positive response is
shown as >20%, medium responses are shown as 10%-20%, weak
responses are shown as 3%-10%, and the absence of a response
(negative) is shown as <3%. The results included a total of 258
positive responses, and 201 of those were weak (3-10%), 44 were
medium (10-20%), and 13 were strong (>20%), leaving a total of
5292 negative responses (<3%). There were 122 responses in
domain II (peptides 1-38) including 11 strong, 24 medium, and 87
weak responses. There were 136 responses in domain III (peptides
39-111) including two strong, 20 medium and 114 weak responses.
[0361] Peptides 15 and 14 (in pool 3) provided the strongest and
most frequent responses in the study with 21 and 18 positive
responses, respectively. A total of 36 peptides did not provide any
response. Sixteen of the 50 naive donors had a single epitope
giving a response, as indicated by one, two, or three responses in
overlapping consecutive peptides. Fifteen donors had two separate
epitopes, 14 had three epitopes, and five had four epitopes. On 22
occasions, a fine screen of a positive pool did not provide a
specific peptide response or was not done, resulting in five
consecutive positive responses in the heat map.
[0362] FIG. 1B illustrates the positive and negative responses of
the nine mesothelioma and the seven HCL patients. It was found that
the mesothelioma patients provided 919 negative responses and 80
responses, including two strong responses (>20%), four medium
responses (10-20%), and 74 weak responses (3-10%). The two strong
responses were in peptides 13 and 14, and the medium responses were
in peptides 15, 35, 57 and 74. Thirty-five of the responses were in
domain II (peptides 1-38) and 45 in domain III (peptides 38-111).
The hot spot pattern created in the map is similar to the hot spot
pattern in the naive donors map. The responsiveness (meaning how
many epitopes were found for each patient) was higher than the
donor's pattern with one patient having two epitopes, four patients
having three epitopes, two patients having four epitopes and two
more patients having five epitopes.
[0363] Moreover, it was found that the seven HCL patients provided
three strong responses (>20%), nine medium responses (10-20%),
37 weak responses (3-10%), and 728 negative responses (<3%). The
strong responses were all in the consecutive peptides 75, 76 and
77. Twenty-two of the responses were in domain II and 37 responses
were in domain III. Interestingly, the immunodominant epitope in
peptides 14 and 15 that was identified in more than 40% of the
naive donors and 55% of the mesothelioma patients (five out of nine
samples) did not have a single response in the HCL patients. One
patient responded to peptides 12 and 13 that have amino acids in
common with peptides 14 and 15. However, no responses were found
directly to peptides 14 and 15. This may be attributed to the
biased HLA distribution of those patients' samples or to the nature
of the disease.
[0364] Overall, eight major epitopes were identified in PE38 that
account for 93% of the responses. Because all T cell epitopes in
domain II could be eliminated using the LR deletion, the five
epitopes remaining in domain III were the focus of subsequent
study. Table 1A summarizes the epitopes' locations, sequences,
response rates, and the mutation that diminishes each with minimal
disturbance to cytotoxic activity. The epitope ranking was composed
of a number of factors, including the number of naive donors
responding to the epitope, the relative strength of the response,
the number of mesothelioma patients that responded, and, to a
lesser extent, the HCL patients' responses. The epitopes from HCL
patients were evaluated to a lesser extent in this analysis because
of the HLA bias of the patient cohort and in the HCL patient
population, in which HCL patients have an enrichment of BRB1_11
(Annino et al., Leuk. Lymphoma, 14 (Suppl.) 1:63-5 (1994)). Epitope
2 spans five peptides. To simplify analysis, it was divided into
two sub-epitopes: peptides 77-78 (2A) and peptides 75-76 (2B). Some
donors responded to both 2A and 2B epitopes, while others responded
to only one. Epitope 6 (peptides 93-96) and epitope 8 (peptides
56-59) were also divided into two sub-epitopes.
TABLE-US-00001 TABLE 1A Responses Relative Donors Mesothelioma HCL
cytotoxic Epitope ranking Peptide # Sequence (n = 50) (n = 9) (n =
7) Mutations Activity* 1 13-15 LVALYLAARLSWNQV 21 6 1 Domain II
100% SEQ ID NO: 189 deletion 2 A 77-78 GALLRVYVPRSSLPG 14.sup.a
.sup. 3.sup.a .sup. 6.sup.a R505A 100% SEQ ID NO: 190 B 74-76
IRNGALLRVYVPRSS 10.sup.a .sup. 6.sup.a .sup. 5.sup.a R494A
21-36%.sup. SEQ ID NO: 191 3 8-9 RQPRGWEQLEQCGYP 9 3 3 Domain II
100% SEQ ID NO: 192 deletion 4 5-6 LPLETFTRHRQPRGW 10 2 0 Domain II
100% SEQ ID NO: 193 deletion 5 67-68 WRGFYIAGDPALAYG 8 2 2 L477H
100% SEQ ID NO: 194 6A + B 93-96 GPEEEGGRLETILGWPLA 8 1 2 L552E
100% SEQ ID NO: 195 7 51-52 TVERLLQAHRQLEER 5 1 0 R427A 100% SEQ ID
NO: 196 8A + B 56-59 FVGYHGTFLEAAQSIVFG 5 5 4 F443A >100% SEq ID
NO: 197 *Activity for a single point mutation in IIA22 RIT and
evaluated in CA46 cell line. .sup.aDonors and patients that
responded to epitope 2A overlap with the patients and donors that
responded to 2B.
[0365] To compare the results from naive donors to
immunotoxin-treated patients, two patient cohorts that made
neutralizing antibodies against the RIT were studied. The patients'
DRB1 HLA alleles are shown in Table 1B. The same epitopes
identified in the donor cohort were also present in the patient
cohorts. One cohort was from mesothelioma patients treated with
SS1P (anti-mesothelin Fv fused to P38) (Chowdhury et al., Nat.
Biotechnol., 17: 568-572 (1999)); the other from leukemia patients
treated with moxetumomab pasudotox (MP), a RIT including PE38 fused
to an anti-CD22 Fv (Kreitman et al., Clin. Cancer Res., 17:
6398-6405 (2011)). The naive donor epitope responses ranged from
1-4 epitopes per donor, with an average of 2.1, and the patient
responses ranged from 1-7 per patient, with a higher average of 3.4
(P<0.001 in Student T test). This suggests that some responses
in the naive population were too weak to be detected by this
method, and were amplified after exposure to immunotoxin. The
patient samples did not identify any major epitopes that were not
identified using the donor cohort.
TABLE-US-00002 TABLE 1B HLA haplotype Donor Diagnosis DRB1 71509WBp
HCL 04, 11 102609aph HCL 1103, 1303 112309aph HCL 0404, 0701
121809aph HCL 07, 11 050710aph HCL 01, 07 021012b aph HCL 04, 07
071912aph HCL 07, 11 120909 aph Mesothelioma 0410, 1501 011410 aph
Mesothelioma 0101, 0801 012810aph Mesothelioma 0301, 1501 050510aph
Mesothelioma 0401, 1302 091510 aph Mesothelioma 07, 15 022811aph
Mesothelioma 1301, 1302 100711aph Mesothelioma 0103, 03 021012aph
Mesothelioma 0101, 0101 031612 aph Mesothelioma 0401, 12
Example 2
[0366] This example demonstrates the elimination of T cell epitopes
in domain III.
[0367] For each one of the epitopes in domain III that are
described in Table 1, alanine scanning mutagenesis was performed.
The alanine mutant was incorporated into the RIT according to the
following 11 steps: (1) a list was made of all alanine peptide
variants for each epitope; (2) in silico prediction was performed
to rule out alanine variants that had increased binding to at least
six HLA alleles using an HLA binding algorithm (Immune Epitope
Database, IEDB) (Wang et al., PLoS Comput. Biol., 4:e1000048
(2008)) that measured their ability to bind to 13 major HLA groups;
(3) alanine variants were assayed using 8-15 donors and patient
samples with in vitro expansion and ELIspot; (4) an alanine
mutation with diminished T cell activation was identified; (5) the
alanine mutation was cloned into the HA22-LR plasmid, and a RIT was
constructed with a single point mutation; (6) activity was studied
using the WST8 assay.
[0368] If the protein was aggregated or has low cytotxic activity,
(7) in silico prediction and crystal structure was used to identify
alternative amino acids to alanine and (8) the new mutation was
cloned into an HA22-LR plasmid, and a RIT was constructed with a
single point mutation and activity was studied. If the protein was
aggregated or had low cytotoxic activity, then the next best
alanine mutant was identified as in step 4 and step 5 was carried
out. If the protein was active, step 10 was carried out.
[0369] If the protein was active, (10) validation was carried out
to determine whether the epitope was diminished and that no new
epitopes were created due to the mutation; and (11) the successful
point mutations were combined into a single RIT.
[0370] The results for all epitopes are shown in Tables 2-7. In
Tables 2-7, underlined values represent <10%, D=Donor,
Pt=patient, "Meso"=mesothelioma, the position where the amino acid
was replaced with alanine is underlined, and the average values are
bolded. Alanine variants were assayed using 8-15 donor and patient
samples with in vitro expansion and ELIspot.
TABLE-US-00003 TABLE 2 CD4+ T cell response to alanine variant
peptides and WT76. donor/ HCL Meso HCL Meso Meso Mean patient Pt Pt
Pt Pt Pt D1 D2 D3 D4 D5 n = 16 No 3% 0% 0% 1% 0% 0% 9% 0% 17% 1% 0%
peptide WT76 IRNGALLRVYVPRSS 100% 100% 100% 100% 100% 100% 100%
100% 100% 100% 100% SEQ ID NO: 198 I493A ARNGALLRVYVPRSS 2% 13% 0%
36% 52% 6% 20% 110% 71% 76% 25% SEQ ID NO: 199 R494A
IANGALLRVYVPRSS 1% 0% 2% 2% 0% 12% 26% 111% 88% 94% 24% SEQ ID NO:
200 N495A IRAGALLRVYVPRSS 95% 25% 2% 31% 12% 35% 40% 102% 72% 72%
34% SEQ ID NO: 201 G496A IRNAALLRVYVPRSS 107% 58% 18% 63% 34% 18%
37% 96% 44% 99% 42% SEQ ID NO: 202 L498A IRNGAALRVYVPRSS 4% 4% 0%
4% 27% 0% 80% 6% 16% 31% 5% SEQ ID NO: 203 L499A IRNGALARVYVPRSS 7%
0% 0% 1% 2% 6% 31% 30% 15% 57% 3% SEQ ID NO: 204 R500A
IRNGALLAVYVPRSS 5% 4% 24% 2% 0% 24% 26% 1% 20% 6% 4% SEQ ID NO: 205
V501A IRNGALLRAYVPRSS 5% 0% 7% 13% 29% 0% 46% 25% 27% 48% 11% SEQ
ID NO: 206 Y502A IRNGALLRVAVPRSS 29% 4% 18% 23% 70% 12% 23% 5% 20%
0% 19% SEQ ID NO: 207 V503A IRNGALLRVYAPRSS 54% 58% 47% 68% 30% 41%
63% 35% 27% 43% 41% SEQ ID NO: 208 P504A IRNGALLRVYVARSS 91% 125%
49% 122% 117% 206% 60% 35% 26% 18% 74% SEQ ID NO: 209 R505A
IRNGALLRVYVPASS 95% 83% 87% 127% 133% 147% 131% 36% 23% 30% 87% SEQ
ID NO: 210 S506A IRNGALLRVYVPRAS 92% 138% 44% 107% 100% 312% 214%
101% 55% 82% 106% SEQ ID NO: 211 S507A IRNGALLRVYVPRSA 99% 96% 51%
69% 106% 235% 137% 71% 83% 84% 94% SEQ ID NO: 212
TABLE-US-00004 TABLE 3 T cell response to alanine variant peptides
and WT77. D/ HCL HCL HCL HCL Meso Mean Pt Pt 1 Pt 2 Pt 3 Pt 4 Pt 1
D1 D2 D3 (n = 8) No 0% 0% 0% 12% 1% 18% 9% 7% 6% peptide wt 77
GALLRVYVPRSSLPG 100% 100% 100% 100% 100% 100% 100% 100% 100% SEQ ID
NO: 213 G496A AALLRVYVPRSSLPG 29% 51% 126% 151% 37% 58% 112% 123%
86% SEQ ID NO: 214 A497G GGLLRVYVPRSSLPG 103% 68% 102% 167% 71%
108% 129% 126% 109% SEQ ID NO: 215 L498A GAALRVYVPRSSLPG 61% 38% 7%
166% 43% 20% 13% 140% 61% SEQ ID NO: 216 L499A GALARVYVPRSSLPG 46%
24% 33% 162% 1% 26% 73% 61% 53% SEQ ID NO: 217 R500A
GALLAVYVPRSSLPG 59% 31% 1% 189% 6% 16% 1% 124% 53% SEQ ID NO: 218
V501A GALLRAYVPRSSLPG 7% 18% 18% 84% 15% 26% 49% 28% 31% SEQ ID NO:
219 Y502A GALLRVAVPRSSLPG 14% 1% 4% 10% 0% 25% 8% 9% 9% SEQ ID NO:
220 V503A GALLRVYAPRSSLPG 17% 1% 15% 18% 1% 39% 49% 9% 19% SEQ ID
NO: 221 P504A GALLRVYVARSSLPG 46% 32% 38% 127% 36% 43% 12% 41% 47%
SEQ ID NO: 222 R505A GALLRVYVPASSLPG 7% 1% 28% 15% 2% 24% 39% 22%
17% SEQ ID NO: 223 S506A GALLRVYVPRASLPG 68% 42% 107% 128% 48% 93%
122% 50% 82% SEQ ID NO: 224 S507A GALLRVYVPRSALPG 35% 37% 86% 164%
60% 106% 96% 224% 101% SEQ ID NO: 225 L508A GALLRVYVPRSSAPG 8% 0%
73% 12% 46% 99% 88% 15% 43% SEQ ID NO: 226 P509A GALLRVYVPRSSLAG
10% 4% 87% 57% 72% 101% 119% 16% 58% SEQ ID NO: 227
TABLE-US-00005 TABLE 4 T cell response to alanine variant peptides
and WT 67 HCL HCL HCL Meso Meso Mean % from WT Pt 1 Pa 2 Pt 3 Pt 1
Pt 2 D1 D2 D3 D4 D5 (n = 14) No 6% 3% 3% 13% 1% 1% 13% 0% 0% 0% 13%
peptide WT 67 WRGFYIAGDPALAYG 100% 100% 100% 100% 100% 100% 100%
100% 100% 100% 100% SEQ ID NO: 228 F469A WRGAYIAGDPALAYG 80% 68%
93% 11% 81% 104% 35% 97% 88% 60% 69% SEQ ID NO: 229 Y470A
WRGFAIAGDPALAYG 61% 6% 61% 6% 68% 48% 67% 29% 16% 92% 43% SEQ ID
NO: 230 I471A WRGFYAAGDPALAYG 17% 36% 22% 7% 35% 20% 20% 22% 12%
55% 24% SEQ ID NO: 231 A472G WRGFYIGGDPALAYG 37% 81% 38% 20% 60%
84% 75% 46% 19% 76% 48% SEQ ID NO: 232 P475A WRGFYIAGDAALAYG 72%
18% 46% 73% 38% 34% 57% 15% 16% 70% 43% SEQ ID NO: 233 A476G
WRGFYIAGDPGLAYG 75% 49% 40% 110% 32% 207% 26% 67% 35% 115% 70% SEQ
ID NO: 234 L477A WRGFYIAGDPAAAYG 54% 32% 54% 92% 52% 25% 42% 26%
16% 71% 44% SEQ ID NO: 235 A478G WRGFYIAGDPALGYG 80% 81% 62% 96%
58% 134% 24% 63% 98% 66% 72% SEQ ID NO: 236 Y479A WRGFYIAGDPALAAG
114% 106% 76% 250% 138% 108% 117% 71% 21% 94% 104% SEQ ID NO:
237
TABLE-US-00006 TABLE 5 Alanine scanning for peptides 93-94
GPEEEGGRLETILGWPLA (SEQ ID NO: 238) HCL Pt1 D1 D2 HCL Pt 2 Meso Pt
1 Meso Pt 2 Responder groups 93 93 93 94 94 94 No 3% 9% 2% 7% 4% 3%
peptide WT GPEEEGGRLETILGWPLA 100% 100% 100% 100% 100% 100% 93-94
SEQ ID NO: 238 E547A GPEAEGGRLETILGWPLA 73% 18% 254% 85% 120% 122%
SEQ ID NO: 239 E548A GPEEAGGRLETILGWPLA 58% 24% 170% 112% 98% 86%
SEQ ID NO: 240 R551A GPEEEGGALETILGWPLA 62% 6% 2% 95% 70% 42% SEQ
ID NO: 241 L552A GPEEEGGRAETILGWPLA 54% 44% 10% 91% 35% 11% SEQ ID
NO: 242 T554A GPEEEGGRLEAILGWPLA 77% 9% 5% 94% 133% 130% SEQ ID NO:
243 I555A GPEEEGGRLETALGWPLA 111% 176% 119% 67% 25% 15% SEQ ID NO:
244 L556A GPEEEGGRLETIAGWPLA 24% 235% 3% 40% 10% 13% SEQ ID NO: 245
W558A GPEEEGGRLETILGAPLA 20% 200% 13% 13% 26% 7% SEQ ID NO: 246
P559A GPEEEGGRLETILGWALA 24% 197% 208% 95% 69% 37% SEQ ID NO: 247
L560A GPEEEGGRLETILGWPAA 81% 321% 162% 89% 132% 117% SEQ ID NO: 248
Meso Pt 3 D3 D4 D5 Mean n = 10 Responder groups 94 94 94 94 No 15%
35% 25% 12% 11% peptide WT GPEEEGGRLETILGWPLA 100% 100% 100% 100%
100% 93-94 SEQ ID NO: 238 E547A GPEAEGGRLETILGWPLA 136% 73% 106%
90% 108% SEQ ID NO: 239 E548A GPEEAGGRLETILGWPLA 137% 102% 207% 87%
108% SEQ ID NO: 240 R551A GPEEEGGALETILGWPLA 54% 40% 67% 49% 49%
SEQ ID NO: 241 L552A GPEEEGGRAETILGWPLA 14% 85% 51% 46% 44% SEQ ID
NO: 242 T554A GPEEEGGRLEAILGWPLA 129% 110% 95% 112% 89% SEQ ID NO:
243 I555A GPEEEGGRLETALGWPLA 36% 63% 36% 36% 69% SEQ ID NO: 244
L556A GPEEEGGRLETIAGWPLA 43% 35% 83% 29% 51% SEQ ID NO: 245 W558A
GPEEEGGRLETILGAPLA 26% 46% 54% 31% 44% SEQ ID NO: 246 P559A
GPEEEGGRLETILGWALA 74% 65% 121% 46% 94% SEQ ID NO: 247 L560A
GPEEEGGRLETILGWPAA 75% 46% 138% 95% 126% SEQ ID NO: 248
TABLE-US-00007 TABLE 6 Alanine scanning for peptide TVERLLQAHRQLEER
(SEQ ID NO: 249) HCL Meso Meso Meso Mean Pt 1 Pt 1 Pt 2 Pt 3 D1 D2
D3 n = 7 No 0% 1% 0% 1% 13% 14% 7% 5% peptide WT51 TVERLLQAHRQLEER
100% 100% 100% 100% 100% 100% 100% 100% SEQ ID NO: 249 R421A
TVEALLQAHRQLEER 23% 87% 2% 5% 22% 12% 26% 25% SEQ ID NO: 250 L422A
TVERALQAHRQLEER 29% 18% 0% 1% 31% 10% 16% 17% SEQ ID NO: 251 L423A
TVERLAQAHRQLEER 47% 21% 11% 3% 8% 10% 6% 14% SEQ ID NO: 252 A425G
TVERLLQGHRQLEER 105% 51% 4% 6% 57% 16% 68% 52% SEQ ID NO: 253 R427A
TVERLLQAHAQLEER 78% 81% 1% 2% 37% 10% 35% 37% SEQ ID NO: 254 L429A
TVERLLQAHRQAEER 63% 64% 38% 36% 28% 19% 124% 67% SEQ ID NO: 255
E430A TVERLLQAHRQLAER 100% 100% 242% 73% 112% 26% 99% 108% SEQ ID
NO: 256 R432A TVERLLQAHRQLEEA 105% 92% 87% 69% 65% 57% 142% 106%
SEQ ID NO: 257
TABLE-US-00008 TABLE 7 Alanine scanning for 18 mer peptide
FVGYHGTFLEAAQSIVFG (57-58) (SEQ ID NO: 258) HCL Pt 1 Meso Pt 1 Meso
Pt 2 D1 HCL Pt 2 HCL Pt 3 Responder groups 57 57 57 57 58 58 No 0%
0% 0% 4% 0% 1% peptide WT FVGYHGTFLEAAQSIVFG 100% 100% 100% 100%
100% 100% 57-58 SEQ ID NO: 258 F436A AVGYHGTFLEAAQSIVFG 57% 98%
159% 7% 103% 103% SEQ ID NO: 259 V437A FAGYHGTFLEAAQSIVFG 84% 78%
130% 81% 97% 95% SEQ ID NO: 260 G438A FVAYHGTFLEAAQSIVFG 67% 52%
78% 79% 71% 88% SEQ ID NO: 261 Y439A FVGAHGTFLEAAQSIVFG 22% 96% 21%
17% 79% 97% SEQ ID NO: 262 H440A FVGYAGTFLEAAQSIVFG 11% 12% 95% 6%
46% 113% SEQ ID NO: 263 T442A FVGYHGAFLEAAQSIVFG 77% 84% 151% 31%
48% 102% SEQ ID NO: 264 F443A FVGYHGTALEAAQSIVFG 2% 0% 40% 7% 5% 2%
SEQ ID NO: 265 L444A FVGYHGTFAEAAQSIVFG 69% 54% 74% 140% 9% 4% SEQ
ID NO: 266 A446G FVGYHGTFLEGAQSIVFG 80% 40% 47% 119% 80% 37% SEQ ID
NO: 267 A447G FVGYHGTFLEAGQSIVFG 65% 104% 57% 103% 19% 28% SEQ ID
NO: 268 S449A FVGYHGTFLEAAQAIVFG 98% 126% 93% 104% 23% 65% SEQ ID
NO: 269 I450A FVGYHGTFLEAAQSAVFG 138% 159% 130% 124% 2% 66% SEQ ID
NO: 270 V451A FVGYHGTFLEAAQSIAFG 119% 127% 162% 121% 82% 117% SEQ
ID NO: 271 F452A FVGYHGTFLEAAQSIVAG 119% 126% 154% 156% 99% 104%
SEQ ID NO: 272 Meso Pt 3 Meso Pt 4 D2 D3 Avg Responder groups 58 58
58 58 No 1% 0% 10% 9% 4% peptide WT FVGYHGTFLEAAQSIVFG 100% 100%
100% 100% 100% 57-58 SEQ ID NO: 258 F436A AVGYHGTFLEAAQSIVFG 89%
45% 41% 123% 83% SEQ ID NO: 259 V437A FAGYHGTFLEAAQSIVFG 96% 85%
102% 148% 99% SEQ ID NO: 260 G438A FVAYHGTFLEAAQSIVFG 118% 91% 98%
68% 83% SEQ ID NO: 261 Y439A FVGAHGTFLEAAQSIVFG 125% 147% 110% 154%
91% SEQ ID NO: 262 H440A FVGYAGTFLEAAQSIVFG 108% 120% 90% 102% 75%
SEQ ID NO: 263 T442A FVGYHGAFLEAAQSIVFG 93% 50% 59% 127% 82% SEQ ID
NO: 264 F443A FVGYHGTALEAAQSIVFG 1% 1% 20% 7% 10% SEQ ID NO: 265
L444A FVGYHGTFAEAAQSIVFG 55% 8% 14% 0% 37% SEQ ID NO: 266 A446G
FVGYHGTFLEGAQSIVFG 107% 125% 69% 16% 78% SEQ ID NO: 267 A447G
FVGYHGTFLEAGQSIVFG 118% 87% 43% 7% 67% SEQ ID NO: 268 S449A
FVGYHGTFLEAAQAIVFG 128% 123% 163% 200% 110% SEQ ID NO: 269 I450A
FVGYHGTFLEAAQSAVFG 108% 104% 31% 11% 78% SEQ ID NO: 270 V451A
FVGYHGTFLEAAQSIAFG 142% 118% 137% 50% 116% SEQ ID NO: 271 F452A
FVGYHGTFLEAAQSIVAG 103% 151% 104% 123% 127% SEQ ID NO: 272
[0371] Epitopes 2A and 2B were scanned separately to cover the 9
mer core of all five peptides that gave responses. Y502A diminished
the responses of both epitopes (Tables 2 and 3). For epitopes 5 and
7, alanine mutants were compared to peptide 67 and 51,
respectively, and I471A and L423A had the lowest T cell response
(Tables 4 and 6). To cover all 9 mer cores in epitopes 6 and 8 that
contained four positive peptides, 18 mer WT and alanine variants
were synthesized. It was found that L552A was the most effective in
lowering the response in epitope 6 (Table 5) and F443A was best for
epitope 8 (Table 7).
Example 3
[0372] This example demonstrates the cytotoxic activity of point
mutation proteins in HA22-LR.
[0373] Step 4 of Example 2 was carried out. The best variants
identified in the alanine scan or using further in silico
prediction are described in Table 1A.
[0374] Forty mutant RITs were constructed. The cytotoxic activity
of point mutation proteins in HA22-LR was evaluated with respect to
CA46, Raji, and Daudi cells. Yields of purified protein, calculated
accessible surface areas (Lee et al., J. Mol. Biol., 55:379-400
(1971); Roscoe et al., Infect. Immunity, 62:5055-5065 (1994)) of WT
amino acids residues and cytotoxic activity of each RIT are shown
in Table 8.
TABLE-US-00009 TABLE 8 Protein activity Protein Mean relative Pep-
Muta- ASA yield activity (%) .+-. SD tide tion (.ANG..sup.2)* (mg)
CA46 Raji Daudi 76 R500A 0 A 76 L498A 4 A 76 L499A 0.1 A 76 R494A
35 2.0 21 .+-. 3 33 .+-. 10 36 .+-. 8 76 R494D 35 3.23 11 77 R505A
150 4 78 .+-. 13 185 .+-. 106 76/77 Y502A 0 A 76/77 Y502H 0 A 76/77
Y502F 0 A 76/77 Y502K 0 A 67 I471A 4 1.6 24 67 I471V 4 4 83 108 67
I471M 4 3 3 67 I471H 4 A 67 I471G 4 A 67 I471S 4 1.3 2 67 I471D 4 A
67 Y470A 98 2.3 <1 <1 67 L477A 7 1.4 54 .+-. 21 47 .+-. 13 67
A476G 38 5 67 .+-. 4 84 67 L477G 7 4 14 .+-. 6 14 .+-. 6 67 L477T 7
2.5 <1 <1 67 L477H 7 3 101 .+-. 22 95 .+-. 13 51 L422A 0 2
<1 51 L423A 22 4 30 51 L423N 22 3 5 51 L423T 22 3.2 50 76 51
L423S 22 5 65 51 R421A 16 1 <10 51 R427A 142 0.71 185 .+-. 85
150 .+-. 61 150 .+-. 4 93 R551A 100 4 208 188 .+-. 464 94 W558A 40
1 <1 >2 94 W558D 40 1 <1 94 W558N 40 0.7 <1 94 L556A 0
1.2 2 0 .sup. 2 .+-. 0.4 94 L556V 0 4.2 95 .+-. 32 77 94 L552N 82
2.4 200 94 L552E 82 2.1 110 57/58 F443A 12 3.6 174 .+-. 110 113
.+-. 60 57/58 F443V 12 2.26 95 A--aggregated *Accessible Surface
Areas (ASA) were calculated for the wild type residue.
Example 4
[0375] This example demonstrates that the substitutions in PE
domain III diminish the epitope and do not create new epitopes due
to the mutation.
[0376] The response of three donor samples and one patient sample
to 22 peptide pools after stimulation with either HA22 (wt) or
LR-R494A was measured. "LR" denotes the deletion of all of domain
II except the furin cleavage sequence. The results are shown in
FIGS. 2A-2D. As shown in FIGS. 2A-2D, the epitope in peptide 76 was
diminished by the R494A mutation.
[0377] The response of two donor samples and one patient sample to
22 peptide pools after stimulation with either HA22 (wt) or
LR-R505A was measured. The results are shown in FIGS. 3A-3C. As
shown in FIGS. 3A-3C, the epitope in peptide 77 was diminished by
the R505A mutation.
[0378] The response of two donors to 22 peptide pools after
stimulation with either HA22-LR (WT) or HA22-R551A and
restimulation with the appropriate peptides was also measured. The
results are shown in FIGS. 4A-4B. As shown in FIGS. 4A and 4B, the
mutation R551A diminished the epitope in peptide 93.
[0379] The response of cells from two donors and two patients after
stimulation with RIT and restimulation with peptides 93, 94 with
either the WT amino acid sequence, L552E or L552N was measured. The
results are shown in FIGS. 5A-5D. As shown in FIGS. 5A-5D, the
epitope in peptides 93 and 94 was diminished by the L552N and L552E
mutations.
[0380] The response of three donors to 22 peptide pools after
stimulation with either HA22-LR (WT) or LR-R427A and restimulation
with the appropriate peptides was also measured. The results are
shown in FIGS. 6A-6C. As shown in FIGS. 6A-6C, the epitope in
peptide 51 was diminished by the R427A mutation.
[0381] The response of two patients and one donor to pools 8-22
after stimulation with either HA22-LR (WT) or LR-F443A and
restimulation with the appropriate peptides was measured. The
results are shown in FIGS. 7A-7C. As shown in FIGS. 7A-7C, the
epitope in pools 11 and 12 was diminished by the F443A
mutation.
[0382] Four donor samples were stimulated with RIT and restimulated
with peptide 67 containing a valine or alanine mutation at position
1471. The response is shown in FIGS. 9A-9D in Spot Forming Cells
(SFC)/10.sup.6 cells. As shown in FIGS. 9A-9D, mutation I471V did
not diminish the epitope in peptide 67.
[0383] T cell activation as a response to stimulation with peptide
67 or 68 that contained an alanine or histidine mutation at
position L477 or no mutation (WT) was also measured. The results
(SFC/10.sup.6 cells) are shown in Table 9 and FIGS. 10A-10D. As
shown in FIGS. 10A-10D and Table 9, the mutation L477H diminished
the epitope in peptide 67 and 68.
TABLE-US-00010 TABLE 9 hcl meso 11410 41311 102909 021012 031612
Mean WT 67 100 100 100 100 100 100 67 L477A 81 21 24 133 39 60 67
L477H 0 30 123 65 23 48 WT 68 100 100 100 100 100 100 68 L477A 69
19 31 62 38 44 68 L477H 2 34 46 32 48 32
[0384] Cells from two patients were stimulated with RIT and
restimulated with peptide 93, 94 or 95 with either the WT amino
acid sequence or L556V. The results are shown in FIGS. 11A and 11B.
Mutation L477V did not diminish the epitope in peptide 94.
Example 5
[0385] This example demonstrates the activity of combinations of
mutations in HA22-LR.
[0386] To combine the point mutations that were effective in
diminishing the T cell epitopes and maintain good cytotoxic
activity, genes were designed that contain different combinations
of point mutations. The genes were cloned into the HA22-LR RIT
plasmid. Table 10 shows the seven RITs that were constructed and
also HA22-LR WT. Table 10 also shows the cytotoxic activity in two
cell lines and the calculated remaining T cell response. The
calculated remaining response is the sum of the responses shown in
the epitope heat map for each of the epitopes, assuming that the
mutation will eliminate the responses in the epitope completely.
This calculation does not take into account the strength of the
response.
[0387] As shown in Table 10, out of the 258 responses identified in
the donor screen of PE38, 136 responses were in domain III and are
present in HA22-LR. Elimination of the epitopes in peptide (77-78),
(51-52) and (57-58) with mutations R505A, R427A and F443A
(HA22-LR-T2) reduced the calculated responses to 82 responses and
maintained a very active protein with 280% and 135% relative
activity in CA46 and Raji cells, respectively, compared to WT.
HA22-LR-T3 contains four mutations: R505A, R427A, F443A and R494A
and had diminished activity of 55% and 50%. HA22-LR-T7 also has
four mutations, (R505A, R427A, F443A and R551A) and had good
cytotoxic activity with 113% and 100% relative activity in CA46 and
Raji cells. For the construction of HA22-LR-T5, five mutations,
R505A, R494A, L427A, R551A and F443A, were inserted which reduced
the calculated remaining response to 39 responses. However, the
protein's cytotoxic activity was severely reduced to 24% and 19%
relative activity with EC.sub.50>1 ng/ml. HA22-LR-T9 also had
five point mutations (R505A, R427A, F443A, R494A and L477A). T9 had
46 calculated remaining responses; all 46 remaining responses were
weak or medium). It maintained cytotoxic activity with
EC.sub.50<1 ng/ml with relative activity of 36% and 26% in CA46
and Raji cells, respectively. HA22-LR-T11 substitutes L477A in T9
with L477H which improved that activity to 0.2 ng/ml with 85%
relative activity in CA46. Lastly, T18 (also referred to as
"LMB-T18") was the first RIT that contains six mutations and
diminished all the major epitopes that were identified. It had good
relative activity with IC50<0.3 ng/ml and relative activity of
63% and 104% compared to HA22-LR in CA46 and Raji cells. To improve
cytotoxic activity, a Gly-Gly-Ser peptide linker was inserted after
the furin cleavage site.
TABLE-US-00011 TABLE 10 RIT T2-HA T3-HA T5-HA T7-HA T9-HA T11-HA
T18 backbone HA22-LR HA22-LR HA22-LR HA22-LR HA22-LR HA22-LR
HA22-LR HA22-LR R505A 77-78 + + + + + + + R494A 75-76 + + + + +
L477A 67-68 + L477H 67-68 + + R427A 51-52 + + + + + + + R551A 93-94
+ + L552E + F443A 57-58 + + + + + + + Cytotoxic Activity CA46 IC50*
0.17 0.06 0.31 0.71 0.15 0.48 0.2 0.27 (ng/ml) CA46 Relative 100%
280% 55% 24% 113% 36% 85% 63% activity Raji IC50* 0.23 0.17 0.46
1.18 0.23 0.88 0.24 (ng/ml) Raji Relative 100% 135% 50% 19% 100%
26% 104% activity Calculated 136/258 82/258 62/258 39/258 59/258
46/258 46/258 19/258 Responses *IC50 values are an average of 2-9
assays, depending on the protein.
[0388] To characterize the cytotoxic activity properties of T3 and
T18, WST-8 assays were performed in four cell lines that express
CD22: ca46, Raji, Daudi and HAL-01. Each assay was performed three
times. Table 11A shows the average EC.sub.50 values for each cell
line. Both HA22-LR-T3 and HA22-LR-T18 were very cytotoxic, although
somewhat less than the parent molecule HA22-LR-GGS. Compared with
HA22-LR-GGS, HA22-LR-T18 showed relative activity that ranged
between 28%-55% with IC.sub.50<1 ng/ml in the four cell lines.
HA22-LR-T3 was also very active, however, less active than T18.
TABLE-US-00012 TABLE 11A Summary of EC.sub.50 and relative activity
of HA22-LR-T3 and HA22-LR-T18 RITs HA22-LR- HA22-LR- HA22-LR- Cell
Line GGS T3 T18 CA46 EC.sub.50.+-. 0.1 0.4 0.3 (ng/mL) SD .+-.0.003
.+-.0.08 .+-.0.01 Relative 100 18 28 activity (%) Raji
EC.sub.50.+-. 0.1 0.3 0.2 (ng/mL) SD .+-.0.04 .+-.0.15 .+-.0.07
Relative 100 34 55 activity (%) Daudi EC.sub.50.+-. 0.1 0.4 0.3
(ng/mL) SD .+-.0.04 0.08 .+-.0.17 Relative 100 31 38 activity (%)
HAL-01 EC.sub.50.+-. 0.3 1.5 0.7 (ng/mL) SD .+-.0.05 .+-.0.47
.+-.0.16 Relative 100 20 42 activity (%)
[0389] Cytotoxicity assays of LMB-T18 were performed on four CD22
expressing cell lines and compared with the cytotoxic activity of
MP (FIG. 27A, Table 11B). LMB-T18 was very potent with an
EC50<10 pM in all cell lines. Compared to MP, LMB-T18 had a
small increase of 53% in activity in CA46 cells, 54% in Daudi cells
and >200% in HAL-01 cells (p=0.2, 0.06 and 0.01 respectively in
Student T test); however, in Raji cells LMB-T18 had a 52% activity
decrease (p=0.3 in Student T test). Without being bound by a
particular theory or mechanism, it is believed that the decrease in
activity in Raji cells was probably due to the domain II deletion
(Weldon et al., Blood, 113: 3792-3800 (2009)). The stability of
LMB-T18 was compared with MP by heating samples for 15 minutes at
various temperatures and, after cooling, measuring residual
cytotoxic activities (FIG. 27B) on Raji cells. MP lost 50% of its
activity after 15 minutes incubation at 56.degree. C. Unexpectedly,
LMB-T18 was more heat-resistant (p<0.05 in Student T test); it
only lost 50% of its activity after a 15-minute incubation at
70.degree. C. Cells from seven HCL and six chronic lymphocytic
leukemia (CLL) patients were used to determine activity on patient
cells. FIGS. 27C-27D show that LMB-T18 is more active than MP on
CLL cells though this difference is not seen with HCL cells.
TABLE-US-00013 TABLE 11B EC50 .+-. SD (pM) Relative Cell line MP
LMB-T18 activity (%) P value CA46 (n = 4) 3.4 .+-. 1.7 2.2 .+-. 0.4
153 0.2 Raji (n = 4) 1.1 .+-. 0.3 2.3 .+-. 0.6 48 0.3 Daudi (n = 4)
3.7 .+-. 1.6 2.4 .+-. 0.8 154 0.06 HAL-01 (n = 4) 25.7 .+-. 3 8.1
.+-. 1.sup. 318 0.01
Example 6
[0390] This example demonstrates the relative activity of B and T
cell epitope modified RIT.
[0391] B cell epitopes in PE38 were previously identified and the
bulky surface residues were mutated with alanine or serine to
reduce antigenicity (Liu et al., Protein Eng. Dec. Sel., (25)(1):
1-6 (2012)). The previously identified mutant RIT with low
antigenicity was named SS1LO10R and it contained the following
mutations: R505A, R427A, R490A, R463A, R467A, R538A.
[0392] To make a minimally immunogenic RIT targeting mesothelin,
the LO10 modifications were incorporated into SS1P and then the T
cell epitope-point mutations were incorporated one by one.
Cytotoxic activity was tested for each one of the variants using
mesothelin expressing cell lines (A9/431 and HAY). Two mutations
R505A and R427A were found to be effective in diminishing both B
and T cell epitopes.
[0393] Table 12 summarizes the cytotoxic activity of the mutated PE
in two cell lines and the calculated remaining response of the
combination RIT that were constructed. Combination of SS1-LO10 with
a single point mutation F443A (SS1-LO10-T2) had high (100%-115%)
relative activity that corresponded to the activity of these point
mutations in HA22-LR. Combination of R494A and R551A in SS1-LO10-T1
gave a very low activity indicating that the combination of R551A
and R494A diminished protein activity in both HA22 and
SS1-LO10.
TABLE-US-00014 TABLE 12 Relative activity of B and T cell epitope
modified RIT RIT R505A R494A L477H R427A R551A F443A Backbone 77-78
75-76 67-68 L477H 51-52 93-94 L552E L552N 57-58 SS1 LO10R SS1 SS1 -
- - - LO10R- LO10R T1 SS1 SS1 + + + LO10R- LO10R T2 SS1 SS1 + + + +
LO10R- LO10R T3 SS1 SS1 + + + + LO10R- LO10R T4 SS1 SS1 + + + +
LO10R- LO10R T7 SS1 SS1 - - - - LO10R- LO10R T8 SS1 SS1 + + + + +
LO10R- LO10R T9 SS1 SS1 + + + + + LO10R- LO10R T11 SS1 SS1 + + + +
+ + LO10R- LO10R T14 SS1 SS1 + + + + + + LO10R- LO10R T15 Cytotoxic
activity A431/H9 HAY IC50* Relative IC50* Relative Calculated R456A
(ng/m) activity (ng/m) activity responses SS1 0.3 0.5 136/258 LO10R
SS1 1.6 19% 50 10% 52/258 LO10R- T1 SS1 0.17 176% 0.5 100% 82/258
LO10R- T2 SS1 0.29 103% 0.6 83% 62/258 LO10R- T3 SS1 + 2 15% nd
62/258 LO10R- T4 SS1 0.6 50% 2 50% 59/258 LO10R- T7 SS1 - 0.9 33%
2.5 20% 59/258 LO10R- T8 SS1 1.1 27% 6.9 7% 46/258 LO10R- T9 SS1
0.42 71% 7 7% 46/258 LO10R- T11 SS1 0.23 130% 1.5 33% 19/258 LO10R-
T14 SS1 0.27 111% 1.9 26% 19/258 LO10R- T15 *IC50 values are an
average of 1-9 assays, depending on the protein; nd--not done
[0394] SS1 LO10R-T11, which contained R505A, R427A, R494A, F443A
and L477H, had 71% activity in H9 cells but only 7% in HAY cells
(assay in HAY was done once). T14 and T15, which contained R505A,
R427A, R494A, F443A and L477H, with an additional mutation (L552E
and L552N, respectively) had >100% relative activity in H9 cells
and IC50>1 ng/ml. These two mutants represent the maximal T cell
deimmunization done in this project thus far.
[0395] Mutant T14 was selected as the best candidate for clinical
development because it includes the removal of B cell and many T
cell epitopes, yet provides good cytotoxic activity on mesothelin
expressing cell lines.
Example 7
[0396] This example demonstrates the anti-tumor activity of
T14.
[0397] Anti-tumor experiments were carried out by injecting saline
(control) or T14 into nude mice with A431/H9 xenografts. Tumor size
was measured every other day and reported in mm. Animals were
weighed at the same time and the weight was reported in grams. The
results are shown in Table 13 below. In Table 13, the arrows show
the day immunotoxin was injected. As shown in Table 13, doses up to
7 mg/kg.times.3 were well tolerated with no signs of toxicity in
the mice. In addition, major tumor regressions were seen at all
dose levels of T14.
TABLE-US-00015 TABLE 13 Days Group Mouse # Day 5 .dwnarw. 7
.dwnarw. 9 .dwnarw. 12 .dwnarw. 14 .dwnarw. A 1 108 23 g 114 22 g
74 23 g 46 36 T14 2 100 22 g 100 22 g 56 22 g 40 64 5 mg mg/kg
.times. 5 3 97 20 g 92 20 g 31 20 g 0 10 iv QOD 4 101 19 g 94 19 g
60 20 g 52 74 (100 ug/mouse) 5 97 22 g 83 22 g 57 22 g 41 70 6 103
21 g 95 21 g 58 21 g 37 58 Mean 101 96 56 36 52 B 1 100 22 g 91 20
g 81 20 g 86 78 T 14 2 96 23 g 103 23 g 50 23 g 14 66 6 mg/kg
.times. 3 3 100 21 g 112 21 g 91 22 g 54 88 iv QOD 4 103 24 g 117
24 g 53 24 g 55 98 (120 ug/mouse) 5 102 21 g 121 20 g 62 20 g 82
125 Mean 100 109 67 58 91 C 1 100 21 g 98 21 g 36 22 g 53 22 g 69 7
mg/kg .times. 3 2 101 20 g 126 19 g 44 20 g 65 21 g 103 iv GOD Mean
101 112 40 59 86 (140 ug/mouse) D 1 100 239 440 816 Control 2 95
133 234 612 saline 3 104 252 463 813 4 92 138 251 543 5 100 152 231
589 Mean 98 183 324 675 Over 800
Example 8
[0398] This example demonstrates the thermal stability of T18.
[0399] The stability of T18 was investigated by heating the RIT for
15 minutes at various temperatures. Cytotoxic assays were
subsequently performed. EC50 of the different heated proteins were
calculated. The results are shown in FIG. 8. The fold increase in
EC50 is shown. As shown in FIG. 8, it was found that T18 maintained
cytotoxic activity in 60.degree. C. and lost 50% of its activity at
68.degree. C. Leaver et al., Methods in Enzymology, 487: 545-74
(2011).
Example 9.1
[0400] This example demonstrates the construction, expression, and
purification of anti-mesothelin deimmunized PE chimeric molecules
with an elongated linker between the anti-mesothelin-Fab fragment
heavy chain and the PE 24 domain and the removal of predicted T
cell epitopes in the linker.
[0401] The linker sequence used in WO 2012/154530 and Weldon et
al., Mol. Cancer Ther., 12: 48-57 (2013) to fuse the dsFv fragment
(via the C-terminus of VH domain) to the deimmunized PE was also
used to fuse a Fab fragment (via the C-terminus of CH1 domain) to
the deimmunized PE. The resulting peptide region, including parts
of the CH1 domain, the linker, and part of the the deimmunized PE
(SEQ ID NO: 273) was examined by TEPITOPE analysis (Bian et al.,
Methods, 34: 468-475 (2004)). Potential T cell epitopes relevant
for European (EU) and United States populations were identified
within the region between the CH1 domain and the linker and the
region between the linker and the PE24 domain. Potential T cell
epitopes were characterized by a confidence number of 3 or lower.
The results are shown in Table 14. As shown in Table 14, the linker
region without the specific elongations (SEQ ID NO: 273) showed
seven potential T-cell epitopes. One potential T-cell epitope was
located in the transition region WEQLGGSPT (SEQ ID NO: 274), and
the other six T-cell epitopes were located in the transition region
VEPKSCKAS (SEQ ID NO: 275). Both of these regions are relevant
mainly for European (EU) and Asian populations.
[0402] The potential T cell epitopes were destroyed by inserting an
amino acid sequence (insert) in each of the transition regions,
thereby providing an insert on each of both sides of the furin
cleavage site. The sequence DKTH (SEQ ID NO: 276) was inserted into
the linker at a location not directly adjacent to the furin
cleavage sequence (FCS), and the sequence GGG (SEQ ID NO: 277) was
inserted into the linker at a location directly adjacent to the FCS
without potential T-cell epitopes. The resulting elongated peptide
region, including a) parts of the CH1 domain, b) the linker
elongated at the Fab fusion area and elongated at the PE fusion
area, and c) part of the of the the deimmunized PE comprised amino
acid SEQ ID NO: 278. The elongated peptide region was studied using
TEPITOPE analysis, and the results are shown in Table 15A. As shown
in Table 15A, the elongated linker did not generate an alert in the
TEPITOPE analysis (confidence numbers of 6 or higher) and, at the
same time, provided improved stability (see Example 9.2 below).
TABLE-US-00016 TABLE 14 Start Confi- An- Inhib- f(NE f(SE f(SW max
Pos Sequence Score dence Profile chor itor Allele Pivot Pept. f
(EU) f(US) Asia) Asia) Asia) (f(all)) 26 WEQLGGSPT 0.3 3 *********
0 0 HLA- 1 0 8.0% 0.6% 5.7% 0.1% 4.1% 8.0% (SEQ ID DRB1*0101 NO:
274) 8 VEPKSCKAS 1.6 2 ***A***** 1 0 HLA- 1 0 0.1% 12.0% 2.6% 0.1%
0.8% 12.0% (SEQ ID DRB1*0802 NO: 275) 8 VEPKSCKAS 2.6 2 ***A***** 1
0 HLA- 1 0 0.1% 0.1% 0.6% 0.0% 0.0% 0.6% (SEQ ID DRB1*0804 NO: 275)
8 VEPKSCKAS 2.6 3 ***A***** 1 0 HLA- 1 0 0.1% 0.0% 0.1% 0.0% 0.0%
0.1% (SEQ ID DRB1*0806 NO: 275) 8 VEPKSCKAS 1.9 3 ********* 0 0
HLA- 1 0 0.2% 0.0% 0.0% 0.0% 1.0% 1.0% (SEQ ID DRB1*1102 NO: 275) 8
VEPKSCKAS 1.9 3 ********* 0 0 HLA- 1 0 N.A. N.A. N.A. N.A. N.A.
0.0% (SEQ ID DRB1*1121 NO: 275) 8 VEPKSCKAS 1.9 3 ********* 0 0
HLA- 1 0 N.A. N.A. N.A. N.A. N.A. 0.0% (SEQ ID DRB1*1322 NO: 275)
all Alerts listed <=3
TABLE-US-00017 TABLE 15A Start Confi- Inhib- Pep- f(NE f(SE f(SW
Pos Sequence Score dence Profile Anchors itors Allele Pivot tide
f(EU) f(US) Asia) Asia) Asia) 30 WEQLGGGGG -1.2 9 ******I** 0 1
HLA-DRB1*0101 1 0 8.0% 0.6% 5.7% 0.1% 4.1% (SEQ ID NO: 279) 33
LGGGGGSPT -0.7 9 ********* 0 0 HLA-DRB1*0102 1 0 0.6% 0.1% 0.0%
0.0% 0.7% (SEQ ID NO: 280) 30 WEQLGGGGG -1 9 ***A****I 1 1
HLA-DRB1*1307 1 0 0.0% 0.0% 0.0% 0.0% 0.0% (SEQ ID NO: 279) 30
WEQLGGGGG 1.4 6 ********* 0 0 HLA-DRB5*0101 1 0 N.A. N.A. N.A. N.A.
N.A. (SEQ ID NO: 279) 30 WEQLGGGGG 1.4 6 ********* 0 0
HLA-DRB5*0105 1 0 N.A. N.A. N.A. N.A. N.A. (SEQ ID NO: 279) no
Alert <=3
Example 9.2
[0403] This example demonstrates the stability of the deimmunized
PE fusion proteins and conjugates having the elongated linker of
SEQ ID NO: 36.
[0404] Six Fab-Linker-PE24 variants were produced and compared with
respect to their thermal stability and propensity for aggregation.
The six variants all contained the same humanized Fab variant H1/L1
of the SS1 antibody, but differed with respect to the linker and
the PE24 mutant. For the linker, either the linker described in
International Patent Application Publication WO 2012/154530
(kasggrhrqprgweqlggs (SEQ ID NO: 281)) or the elongated linker with
the additional amino acids ("long linker"; SEQ ID NO: 36
(dkthkasggrhrqprgweqlgggggs))) was used. As PE24 variants, LRO10R,
LRO10R-456A (SEQ ID NO: 37) or LRO10R-456A-551A were employed in
the constructs.
[0405] FIGS. 12-13 show the level of aggregation of the two
constructs with the PE24 variant LRO10R-456A that was measured in
terms of the area under the aggregate peak by size exclusion
chromatography (SEC) after incubation at 33.degree. C. The two
constructs in FIGS. 12-13 differed only with respect to the linker
employed. The short linker SEQ ID NO: 281 was used in construct
cFP-0170 and the elongated linker SEQ ID NO: 36 was used in
construct cFP-0171.
[0406] FIGS. 14-16 show the thermal stability of constructs as
measured by dynamic light scattering (DLS). For dynamic light
scattering, samples were prepared at a concentration of 1 mg/mL in
20 mM histidine/histidine chloride, 140 mM NaCl, pH 6.0,
transferred into an optical 384-well plate by centrifugation
through a 0.4 .mu.m filter plate and covered with paraffin oil. The
hydrodynamic radius was measured in a WYATT DYNAPRO Plate Reader II
repeatedly by dynamic light scattering while the samples were
heated at a rate of 0.05.degree. C./min from 25.degree. C. to
80.degree. C. The aggregation onset temperature was defined as the
temperature at which the hydrodynamic radius starts to increase.
The results are shown in FIGS. 14-16. The DLS curves for the six
constructs showed higher aggregation temperatures for the elongated
linker compared to the short published linker, with a strong shift
to a higher aggregation temperature for the LRO10R variant (FIGS.
14-16).
[0407] Table 15B shows the thermal stability of constructs cFP-0170
and cFP-0171 as measured by differential scanning calorimetry
(DSC). Differential scanning calorimetry was performed using a
MicroCal DSC system (GE Healthcare). The samples were adjusted to a
protein concentration of approximately 1 mg/ml in 20 mM
histidine/HCl, 140 mM sodium chloride, pH 6.0. The reference cell
was filled with a buffer corresponding to the sample buffer. The
samples were placed in the sample cell and heated from 4.degree. C.
to 110.degree. C. at a heating rate of 60.degree. C./hour. The
pre-scan was 15 minutes, the filtering period was 10 seconds, and
the feedback mode/gain was set to passive. The midpoint of a
thermal transition temperature (Tm, or thermal transition
temperature) was obtained by analyzing the data using MicroCal DSC
analysis software.
TABLE-US-00018 TABLE 15B T-max of the T-max of the Construct Fab
fragment part PE24 part Humanized SS1 Fab long 73.6 41.2
linker-LRO10R, LRO10R- 456A Humanized SS1 Fab long 73.7 43.2
linker-LRO10R, LRO10R
[0408] As shown in FIGS. 12-16 and Table 15B, all chimeric Fab-PE
molecules with the elongated linker provided a decreased tendency
toward aggregation and a higher aggregation temperature as compared
to chimeric Fab-PE molecules with a short linker that was not
elongated.
Example 10
[0409] This example demonstrates the ability of deimmunized PE
fusion proteins with an extended linker to kill tumor cells and
inhibit cellular protein synthesis. This example also demonstrates
the antigenicity of the deimmunized PE fusion proteins with an
extended linker.
[0410] The potency of different Fab-PE24 variants with respect to
the ability to inhibit protein synthesis was compared. A clone of
the pancreatic cancer cell line ASPC-1 (ASPC-1 Luc) that was stably
transfected with luciferase was used. The luciferase protein in
these cells undergoes a high turnover so that the measurable
activity drops markedly within 24 hours of inhibition of its
resynthesis. Briefly, cells were seeded on 96 well plates. After
overnight culture, different concentrations of the cFP variants
were added to the medium, and cells were incubated for another 72
hours. At the end of the incubation period, the cells were lysed,
and luciferase activity was determined with the STEADY-GLOW assay
according to the manufacturer's instructions. In a typical
experiment, an 80-90% reduction of luciferase activity was observed
in lysates from treated cells as compared to lysates from untreated
control cells. EC50 values, i.e., the concentrations that achieve
half maximal effects, were determined based on a free four
parameter fit. Table 16 compares the relative potencies in a
representative experiment by setting the IC50 of huFabLRO10R to
1.
[0411] Untargeted PE24 (variant LR8M) only inhibited at
concentrations >3.5 .mu.g/ml, while the previously described
LRO10 variant fused to a humanized SS1 Fab fragment was .about.500
fold more potent on a molar basis. The LRO10R backmutation
increased potency 10 to 20 fold (EC50 values 1-2 ng/ml versus 18
ng/ml). The 456A mutation had no adverse effect on potency, while
the 551A mutation did reduce activity to the level of LRO10 (EC50
10-23 ng/ml). The new extended linker also had no negative impact
on the cellular potency of the molecules in a comparison of any of
the three pairs of constructs with the extended linker versus those
with the previously described shorter linker.
[0412] Using cell viability assessed by CELLTITERGLOW assays, the
cytotoxic potency of different Fab-PE24 variants using the same
humanized SS1 targeting variant on two different tumor cell lines
(A431 H9 and H596) was compared. Briefly, cells were seeded on 96
well plates. After overnight culture, different concentrations of
the cFPs were added to the medium, and cells were incubated for 72
hours. At the end of the incubation period, cell viability was
determined using a CELLTITERGLOW assay. Table 16 compares the
relative potencies by setting the IC50 of huFabLRO10R to 1.
TABLE-US-00019 TABLE 16 Luciferase Viability assay results assay
results A431 H9 H596 AsPC-1 Luc cFP variant Fold potency reduction
relative to huFabLRO10R huFabLRO10 1.8 2.5 77.5 LR8M 400 450 9452
huFabLRO10R 1 1 1 huFabLRO10R- 1.2 1 2.3 long linker huFabLRO10R-
0.8 1 2.1 456A huFabLRO10R- 0.9 1.2 3 456A- longlinker huFabLRO10R-
2.1 3.3 22.5 456A-551A huFabLRO10R- 2.1 4.5 9.8 456A-551A-
longlinker
[0413] Results similar to those in Table 16 were also obtained
using a cell viability assay with an
3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl tetrazolium bromide
(MTT)-based read-out in different cell lines (Table 17).
TABLE-US-00020 TABLE 17 IC 50s in ng/ml (did not correct for MW
differences) Hu-1 Hu2 Hu3 HAY AGS L55 SS1P 2 0.3 2.9 1.0 0.3 3.0
SS1-LR-GGS 0.25 0.01 0.7 -- -- 1.0 SS1-LR-GGS-010R -- 0.01 -- 0.3
1.0 2.0 Fab-LR-GGS-010R Short 0.25 0.08 0.4 2.5 0.6 3.5
Fab-LR-GGS-010R 456A 0.25 0.05 0.6 2.5 0.6 3.0 Short
Fab-LR-GGS-010R long 0.35 0.04 1.8 2.5 0.9 5.0 Fab-LR-GGS-010R 456A
0.25 0.04 2.0 1.4 1.1 5.0 long Fab-LR-GGS-010R 456A 0.7 0.18 4.2
4.0 6.0 20.0 551A Short Fab-LR-GGS-010R 456A Also Also Also Also
Also Also 551A long low low low low low low
Example 11
[0414] This example demonstrates the removal of B-cell epitopes by
456A mutations in PE.
[0415] A phagemid containing the scFv 9H3 in the vector pCANTAB as
described by Liu et al., PNAS, 109: 11782-11787 (2012) was prepared
by standard methods as described in Sambrook, J. et al., Molecular
cloning: A laboratory manual; Cold Spring Harbor Laboratory Press,
Cold Spring Harbor, N.Y., 1989. The molecular biological reagents
were used according to the manufacturer's instructions. The
phagemid was transformed into electrocompetent TG1 cells. From
single colonies, precultures were grown overnight and used to
inoculate 4 ml cultures of 2.times.YT/1% glucose supplemented with
the appropriate selective antibiotic ampicillin. At an OD.sub.600
of 0.3-0.8, 10.sup.10 cfu VC SM 13 helper phage and IPTG was added
to a final concentration of 1 mM. After incubation for 15 minutes
at 37.degree. C., the culture was grown at 37.degree. C. overnight.
Two hours after helper phage addition, kanamycin was added to final
concentration of 30 .mu.g/ml. The phage-containing supernatant was
harvested from the overnight culture by centrifugation, and the
scFv displaying phage were precipitated from the supernatant by
addition of 1/5 v/v 20% PEG-6000/2.5 M NaCl and isolated by
centrifugation. The phage pellet was dissolved in 0.5 ml PBS/1%
BSA, and the phage solution was cleared by centrifugation and
sterile filtration. The titer of the phage solution was determined
by standard methods as described in Barbas, C. et al., Phage
Display--A laboratory manual, Cold Spring Harbor Laboratory Press,
Cold Spring Harbor, N.Y., 2001.
[0416] 96 well MaxiSorp microtiter plates were coated with 100
.mu.g/ml Fab-PE24 variants. After blocking with PBS buffer
supplemented with 2% BSA, 10.sup.7 and 10.sup.8 scFv-displaying
phage were captured on the plate for one hour. As specific negative
controls, scFv-displaying phages were pre-incubated with 50 .mu.g/m
of the Fab-PE24 variants for 1 hour at room temperature (RT) before
capturing them on the plate. Plates were washed with PBST buffer
(PBS+0.5% Tween 20). Binding of scFv-displaying phage was detected
with POD conjugated anti-m13 antibody (Progen). After a final wash,
the plates were incubated with POD substrate. Absorbance was
measured at 405 nm. Results are shown in FIG. 17, where it can be
seen that the B-cell epitope contained in the phagemid containing
the scFv 9H3 was not removed in LRO10R (with 458R backmutation)
while it was eliminated by both mutations 458A and 456A with a
slightly stronger effect for the 456A mutation.
[0417] Antigenicity testing was done as described in Weldon et al.,
Mol. Cancer Ther., 12: 48-57 (2013). As shown in FIGS. 18A and 18B,
compared to SS1P (T1), the de-immunized variant LRO10R (T2) had a
100-10,000 fold reduced reactivity with most sera from patients
that have been previously exposed to a PE-based therapeutic fusion
protein both with the murine dsFv fusion format and the humanized
Fab fusion format. Also the introduction of the 456A mutation (T3
and T5) or the new extended linker (T5 and T6) showed a 100-10,000
fold reduced reactivity with most sera from patients that have been
previously exposed to a PE-based therapeutic fusion protein.
Example 12
[0418] This example demonstrates the construction, expression and
purification of deimmunized PE variants and Fab fusions thereof as
well as dsFv fusions for comparison.
Example 12.1: Cloning of Anti-Mesothelin Deimmunized PE Chimeric
Molecules cFP-0077 (SEQ ID NOs: 41 and 42) and cFP-0078 (SEQ ID
NOs: 43 and 44)
[0419] For the expression of cFP-0077 and cFP-0078, the E. coli
host/vector system, which enables an antibiotic-free plasmid
selection by complementation of an E. coli auxotrophy (PyrF), was
employed (European Patent Application Publication 0 972 838 and
U.S. Pat. No. 6,291,245). Standard methods were used to manipulate
DNA as described in Sambrook, J. et al., supra. The molecular
biological reagents were used according to the manufacturer's
instructions. Desired gene segments were made by commercial gene
synthesis. The synthesized gene fragments were cloned into a
specified expression vector. The DNA sequences of the subcloned
gene fragments were confirmed by DNA sequencing.
[0420] The expression plasmids for the production of the light
chain and the heavy chain, respectively, were prepared as follows:
The light chain (LC) plasmids 15478 (based on the amino acid
sequences of cFP-0077 and encoding SEQ ID NO: 41) and 15479 (based
on the amino acid sequences of cFP-0078 and encoding SEQ ID NO: 43)
are expression plasmids for the expression of an antibody light
chain fragment in E. coli. They were generated by ligating the
antibody VL domain fragment into the vector using the XhoI/BsiWI
restriction sites for 15478, and XhoI/BlpI for 15479.
[0421] The light chain E. coli expression plasmids comprise the
following elements: [0422] the origin of replication from the
vector pBR322 for replication in E. coli (corresponding to
positions 2517-3160 according to Sutcliffe et al., Quant. Biol.,
43: 77-90 (1979), [0423] the URA3 gene of Saccharomyces cerevisiae
coding for orotidine 5'-phosphate decarboxylase (Rose et al., Gene,
29: 113-124 (1984) which allows plasmid selection by
complementation of E. coli pyrF mutant strains (uracil auxotrophy),
[0424] the antibody light chain expression cassette comprising:
[0425] the T5 hybrid promoter (T5-PN25/03/04 hybrid promoter
according to Bujard et al., Methods. Enzymol., 155: 416-433 (1987)
and Stueber, et al., Immunol. Methods IV, 121-152 (1990) including
a synthetic ribosomal binding site according to Stueber et al.
(supra), [0426] the antibody light chain variable domain comprising
the CDRs of SS1, and [0427] the human Ck domain for 15478 but not
for 15479, [0428] two bacteriophage-derived transcription
terminators, the .lamda.-T0 terminator (Schwarz et al., Nature,
272: 410-414 (1978) and the fd-terminator (Beck et al., Gene, 1-3:
35-58 (1981), and [0429] the lad repressor gene from E. coli
(Farabaugh, Nature, 274: 765-769 (1978).
[0430] The heavy chain (HC) plasmids 15476 (based on the amino acid
sequences of cFP-0077 and encoding SEQ ID NO: 42) and 15477 (based
on the amino acid sequences of cFP-0078 and encoding SEQ ID NO: 44)
are expression plasmids for the expression of a fusion protein
including an antibody heavy chain fragment, a linker containing a
furin cleavage site, and a mutant of domain III of Pseudomonas
aeruginosa Exotoxin A (PE), in E. coli. It was generated by
ligation of the VH domain fragment into the vector using the
XhoI/BsrGI restriction sites for 15476, and XhoI/HindIII
restriction sites for 15477.
[0431] The cytolytic fusion protein heavy chain E. coli expression
plasmids comprise the following elements: [0432] the origin of
replication from the vector pBR322 for replication in E. coli
(corresponding to positions 2517-3160 according to Sutcliffe et
al., Quant. Biol., 43: 77-90 1979), [0433] the URA3 gene of
Saccharomyces cerevisiae coding for orotidine 5'-phosphate
decarboxylase (Rose et al., Gene, 29: 113-124 (1984) which allows
plasmid selection by complementation of E. coli pyrF mutant strains
(uracil auxotrophy), [0434] the heavy chain-PE domain III fusion
protein expression cassette comprising [0435] the T5 hybrid
promoter (T5-PN25/03/04 hybrid promoter according to Bujard et al.,
Methods. Enzymol., 155: 416-433 (1987) and Stueber et al., Immunol.
Methods IV, (1990) 121-152) including a synthetic ribosomal binding
site according to Stueber et al. (supra), [0436] the antibody heavy
chain variable domain comprising the CDRs of SS1, [0437] the human
CH1 domain for 15476 but not for 15477, [0438] the linker
comprising a furin cleavage site [0439] the mutant variant of
Pseudomonas aeruginosa Exotoxin A domain III [0440] two
bacteriophage-derived transcription terminators, the .lamda.-T0
terminator (Schwarz et al., Nature, 272: 410-414 (1978) and the
fd-terminator (Beck et al., Gene, 1-3: 35-58 (1981), and [0441] the
lad repressor gene from E. coli (Farabaugh, Nature, 274: 765-769
(1978).
Example 12.2: Expression of Anti-Mesothelin Deimmunized PE Chimeric
Molecules cFP-0077 and cFP-0078 in E. coli
[0442] All polypeptide chains were expressed separately in the E.
coli strain CSPZ-6.
[0443] The E. coli K12 strain CSPZ-6 (thi-1, .DELTA.pyrF) was
transformed by electroporation with the expression plasmids 15476,
15477, 15478 and 15479, respectively, resulting in the 4 strains
cFP-0019 (based on plasmid 15476), cFP-0020 (based on plasmid
15477), cFP-0040 (based on plasmid 15478) and cFP-0041 (based on
plasmid 15479). For each of the four strains, the transformed E.
coli cells were first grown at 37.degree. C. on agar plates. A
colony picked from this plate was transferred to a 3 mL roller
culture and grown at 37.degree. C. to an optical density of 1-2
(measured at 578 nm). Then 1000 .mu.l of culture was mixed with
1000 .mu.l sterile 86%-glycerol and immediately frozen at
-80.degree. C. for long time storage. The correct product
expression of this clone was first verified in small scale shake
flask experiments and analyzed with SDS-Page prior to the transfer
to the 10 L fermenter.
Pre Cultivation:
[0444] For pre-fermentation, a chemically defined medium
(CD-PCMv2.20) was used: NH.sub.4Cl 1.0 g/l,
K.sub.2HPO.sub.4*3H.sub.2O 18.3 g/l, citrate 1.6 g/l, Glycine 0.78
g/l, L-Alanine 0.29 g/l, L-Arginine 0.41 g/l, L-Asparagine*H.sub.2O
0.37 g/l, L-Aspartate 0.05 g/l, L-Cysteine*HCl*H.sub.2O 0.05 g/l,
L-Histidine 0.05 g/l, L-Isoleucine 0.31 g/l, L-Leucine 0.38 g/l,
L-Lysine*HCl 0.40 L-Methionine 0.27 L-Phenylalanine 0.43 g/l,
L-Proline 0.36 g/l, L-Serine 0.15 L-Threonine 0.40 L-Tryptophan
0.07 g/l, L-Valine 0.33 g/l, L-Tyrosine 0.51 g/l, L-Glutamine 0.12
g/l, Na-L-Glutamate*H.sub.2O 0.82 g/l, Glucose*H.sub.2O 6.0 g/l,
trace elements solution 0.5 ml/l, MgSO.sub.4*7H2O 0.86 g/l, and
Thiamin*HCl 17.5 mg/l. The trace elements solution contained
FeSO.sub.4*7H.sub.2O 10.0 g/l, ZnSO.sub.4*7H.sub.2O 2.25 g/l,
MnSO.sub.4*H.sub.2O 2.13 g/l, H.sub.3BO.sub.3 0.50 g/l,
(NH.sub.4)6Mo.sub.7O.sub.24*4H.sub.2O 0.3 g/l, CoCl.sub.2*6H.sub.2O
0.42 g/l, and CuSO.sub.4*5H.sub.2O 1.0 g/l dissolved in 0.5M
HCl.
[0445] For pre-fermentation, 220 ml of CD-PCMv2.20 medium in a 1000
ml Erlenmeyer-flask with four baffles was inoculated with 1.0 ml
out of a research seed bank ampoule. The cultivation was performed
on a rotary shaker for 8 hours at 32.degree. C. and 170 rpm until
an optical density (578 nm) of 2.9 was obtained. 100 ml of the pre
cultivation was used to inoculate the batch medium of the 10 L
bioreactor.
Fermentation of cFP-0019 and cFP-0020:
[0446] For fermentation in a 101 Biostat C, DCU3 fermenter
(Sartorius, Melsungen, Germany) the following chemically defined
batch medium was used: KH.sub.2PO.sub.4 1.59 g/l,
(NH.sub.4).sub.2HPO.sub.4 7.45 g/l, K.sub.2HPO.sub.4*3H.sub.2O
13.32 g/l, citrate 2.07 g/l, L-methionine 1.22 g/l, NaHCO.sub.3
0.82 g/l, trace elements solution 7.3 ml/l, MgSO.sub.4*7 H.sub.2O
0.99 g/l, thiamine*HCl 20.9 mg/l, glucose*H.sub.2O 29.3 g/l, biotin
0.2 mg/l, and 1.2 ml/l Synperonic 10% anti foam agent. The trace
elements solution contained FeSO.sub.4*7H.sub.2O 10
ZnSO.sub.4*7H.sub.2O 2.25 g/l, MnSO.sub.4*H.sub.2O 2.13 g/l,
CuSO.sub.4*5H.sub.2O 1.0 g/l, CoCl.sub.2*6H.sub.2O 0.42 g/l,
(NH.sub.4)6Mo.sub.7O.sub.24*4H.sub.2O 0.3 g/l, and H.sub.3BO.sub.3
0.50 g/l solubilized in 0.5M HCl solution.
[0447] The feed 1 solution contained 700 g/l glucose*H.sub.2O, 7.4
g/l MgSO.sub.4*7 H.sub.2O and 0.1 g/l FeSO.sub.4*7H.sub.2O. Feed 2
comprises KH.sub.2PO.sub.4 52.7 g/l, K.sub.2HPO.sub.4*3H.sub.2O
139.9 g/l and (NH.sub.4).sub.2HPO.sub.4 66.0 g/l. All components
were dissolved in deionized water. The alkaline solution for pH
regulation was an aqueous 12.5% (w/v) NH.sub.3 solution
supplemented with 11.25 g/l L-methionine.
[0448] Starting with 4.2 l sterile batch medium plus 100 ml
inoculum from the pre-cultivation, the batch fermentation was
performed at 31.degree. C., pH 6.9.+-.0.2, 800 mbar back pressure
and an initial aeration rate of 10 l/min. The relative value of
dissolved oxygen (pO.sup.2) was kept at 50% throughout the
fermentation by increasing the stirrer speed up to 1500 rpm. After
the initially supplemented glucose was depleted, indicated by a
steep increase in dissolved oxygen values, the temperature was
shifted to 25.degree. C., and 15 minutes later the fermentation
entered the fed-batch mode with the start of both feeds (60 and 14
g/h respectively). The rate of feed of 2 was kept constant, while
the rate of feed 1 was increased stepwise with a predefined feeding
profile from 60 to finally 160 g/h within 7 hours. When carbon
dioxide off gas concentration leveled above 2%, the aeration rate
was constantly increased from 10 to 20 l/min within 5 hours. The
expression of recombinant protein was induced by the addition of
2.4 g IPTG at an optical density of approx. 120. The target protein
was expressed as inclusion bodies within the cytoplasm.
[0449] After 24 hours of cultivation, an optical density of 209 was
achieved, and the whole broth was cooled down to 4-8.degree. C. The
bacteria were harvested via centrifugation with a flow-through
centrifuge (13,000 rpm, 13 l/h) and the obtained biomass was stored
at -20.degree. C. until further processing (cell disruption).
Fermentation of cFP-0040 and cFP-0041:
[0450] For fermentation in a 10 l Biostat C, DCU3 fermenter
(Sartorius, Melsungen, Germany) the following complex batch medium
was used: Bacto-Trypton 20 g/l, yeast extract 15 g/l,
KH.sub.2PO.sub.4 1.5 g/l, K2HPO4*3H2O 6.6 g/l, NaCl 1.0 g/l,
MgSO.sub.4*7 H.sub.2O 0.74 g/l, glucose*H.sub.2O 3.0 g/l, and 0.2
ml/l Synperonic 10% anti foam agent.
[0451] The feed 1 solution contained Bacto-Trypton 250 g/l and
yeast extract 175 g/l. pH was controlled using a 75%
glucose*H.sub.2O. All components were dissolved in deionized
water.
[0452] Starting with 7.61 sterile batch medium plus 100 ml inoculum
from the pre cultivation, the batch fermentation was performed at
37.degree. C., pH 7.0.+-.0.3, 500 mbar back pressure and an initial
aeration rate of 101/min. The relative value of dissolved oxygen
(pO.sup.2) was kept at 50% throughout the fermentation by
increasing the stirrer speed up to 1500 rpm. The feeding of feed 1
was started after the culture reached an optical density of 15.
When carbon dioxide off gas concentration leveled above 2%, the
aeration rate was constantly increased from 10 to 201/min within 5
hours. The expression of recombinant protein was induced by the
addition of 2.4 g IPTG at an optical density of approx. 20. The
target protein was expressed insoluble to inclusion bodies within
the cytoplasm.
[0453] After 13 hours of cultivation, an optical density of 100-115
was achieved and the whole broth was cooled down to 4-8.degree. C.
The bacteria were harvested via centrifugation with a flow-through
centrifuge (13,000 rpm, 13 l/h) and the obtained biomass was stored
at -20.degree. C. until further processing (cell disruption and
inclusion body preparation).
Analysis of Product Formation (for cFP-0019, -0020-0040 and
-0041):
[0454] Samples were drawn from the fermenter, one prior to
induction and the others at dedicated time points after induction
of protein expression, were analyzed with SDS-polyacrylamide gel
electrophoresis. From every sample, the same amount of cells
(OD.sub.Target=10) were suspended in 5 mL PBS buffer and disrupted
via sonication on ice. Then 100 .mu.L of each suspension were
centrifuged (15,000 rpm, 5 minutes), and each supernatant was
withdrawn and transferred to a separate vial. This was to
discriminate between soluble and insoluble expressed target
protein. To each supernatant (=soluble protein fraction) 100 .mu.L
and to each pellet (=insoluble protein fraction) 200 .mu.L of SDS
sample buffer (Laemmli, Nature, 227: 680-685 (1970) were added.
Samples were heated for 15 minutes at 95.degree. C. under intense
mixing to solubilize and reduce all proteins in the samples. After
cooling to room temperature, 5 .mu.L of each sample were
transferred to a 4-20% TGX Criterion Stain Free polyacrylamide gel
(Bio-Rad). Additionally, 5 .mu.l molecular weight standard
(Precision Plus Protein Standard, Bio-Rad) were applied.
[0455] The electrophoresis was run for 60 minutes at 200 V and
thereafter the gel was transferred the GELDOC EZ Imager (Bio-Rad)
and processed for 5 minutes with UV radiation. Gel images were
analyzed using IMAGE LAB analysis software (Bio-Rad). Relative
quantification of protein expression was done by comparing the
volume of the product bands to the volume of the 25 kDa band of the
molecular weight standard.
Inclusion Body Preparation:
[0456] The inclusion body preparations (IBP) of the 10 L
fermentations were started directly after the harvest of the
bacteria with the re-suspension of the harvested bacteria cells in
buffer 1 (12.1 g/l Tris, 0.246 g/l MgSO4*7H2O, 12 ml/l 25%-HCl).
The buffer volume was calculated in dependence of the dry matter
content of the biomass. Lysozyme (100 kU/mg, 0.12 mg/g DCW) and a
small amount of benzonase (5 U/g DCW) were added. Then the
suspension was homogenized at 900 bar (APV Rannie 5, 1 pass) to
disrupt the bacteria cells followed by the addition of further
benzonase (30 U/gDCW) and an incubation for 30 minutes at
30-37.degree. C. Then the first wash buffer (60 g/l Brij, 87.6 g/l
NaCl, 22.5 g/l EDTA, 6 ml/l 10N NaOH) was added, and again the
suspension was incubated for 30 minutes. The following
centrifugation step (BP12, Sorvall) led to the inclusion body
slurry, which was re-suspended in the second wash buffer (12.1 g/l
Tris, 7.4 g/l EDTA, 11 ml/l 25%-HCl) and incubated for 20 minutes.
A further separation step harvested the inclusion bodies, which
were stored frozen at -20.degree. C. or immediately solubilized for
refolding and purification.
Example 12.3: Refolding and Purification of Anti-Mesothelin
Deimmunized PE Chimeric Molecules cFP-0077 and cFP-0078
[0457] cFP-0077 and cFP-0078 were both obtained by refolding and
purification.
[0458] Renaturation and Purification of Fab-PE24 (cFP-0077):
Inclusion bodies of HC-PE24 and LC were solubilized separately in 8
M Guanidinium-Hydrochloride, 100 mM Tris/HCl, 1 mM EDTA, pH 8.0+100
mM Dithiothreitol (DTT) overnight at RT (1 g IB in 5 mL).
Solubilizates were adjusted to pH 3 and centrifuged, and the pellet
was discarded. After extensive dialysis against 8 M
Guanidinium-HCl, 10 mM EDTA, pH 3.0 to remove DTT, the total
protein concentration was determined using the Biuret method. The
purity of HC and LC content was estimated via SDS-PAGE.
[0459] Solubilizates were diluted at a 1:1 molar ratio in
renaturation buffer containing 0.5 M arginine, 2 mM EDTA, pH 10+0.9
mM GSH/GSSG, respectively, at 2-10.degree. C. The target protein
concentration was increased in two steps to 0.22 g/L, with an
incubation time of 4 h between the two doses. Afterwards, the
renaturation solution was kept at 2-10.degree. C. overnight.
[0460] The renaturate was diluted with H.sub.2O to <3 mS/cm and
pumped onto an anion exchange column (AIEX) equilibrated in 20 mM
Tris/HCl, pH 7.4. After washing the column with equilibration
buffer, the protein was eluted with a gradient up to 20 mM
Tris/HCl, 400 mM NaCl, pH 7.4. Peak fractions containing Fab-PE24
were pooled, concentrated and applied onto a preparative Size
Exclusion Column (SEC) in 20 mM Tris, 150 mM NaCl, pH 7.4 to remove
aggregates, fragments and E. coli proteins. The final protein pool
was adjusted to the required protein concentration and analyzed via
SDS-PAGE, analytical SEC and UV.sub.280, and identity was confirmed
by mass spectrometry.
[0461] Renaturation and Purification of dsFv-PE24 (cFP-0078):
Inclusion bodies of HC-PE24 and LC were solubilized separately 8 M
Guanidinium-Hydrochloride, 100 mM Tris/HCl, 1 mM EDTA, pH 8.5+100
mM DTT overnight at RT (1 g IB in 5 mL). Solubilisates were
adjusted to pH 3 and centrifuged, and the pellet was discarded.
After extensive dialysis against 7.2 M Guanidinium-HCl, 10 mM EDTA,
pH 3.0 to remove DTT, the total protein concentration was
determined using the Biuret method, and the purity of HC and LC
content was estimated via SDS-PAGE.
[0462] Solubilizates were diluted 1:100 in renaturation buffer
containing 0.5 M arginine, 2 mM EDTA, pH 10+0.9 mM GSH/GSSG,
respectively, at a 1:1 molar ratio and kept overnight at
2-10.degree. C.
[0463] The renaturate was diluted with H.sub.2O to <3 mS/cm and
pumped onto an anion exchange column (AIEX) equilibrated in 20 mM
Tris/HCl, 1 mM EDTA, pH 7.4. After washing the column with
equilibration buffer, the protein was eluted with a gradient up to
20 mM Tris/HCl, 1 mM EDTA, 400 mM NaCl, pH 7.4. Peak fractions
containing dsFv-PE24 were pooled, concentrated and applied onto a
preparative Size Exclusion Column (SEC) in 20 mM Tris/HCl, 150 mM
NaCl, pH 7.4 to remove aggregates, fragments and E. coli proteins.
The final protein pool was adjusted to the required protein
concentration and analyzed via CE-SDS, analytical SEC and
UV.sub.280. Identity was confirmed by mass spectrometry.
Example 12.4: Protein Analysis of cFP-0077 and cFP-0078
[0464] Samples were analyzed by OD 280 nm using a UV
spectrophotometer to determine the protein concentration in
solution. The extinction coefficient required for this was
calculated from the amino acid sequence according to Pace et al.,
Protein Science, 4: 2411-2423 (1995). Size-exclusion chromatography
(SE-HPLC) was performed on TSK-Ge1300SWXL or Superdex 200 columns
with a 0.2 M potassium phosphate buffer, comprising 0.25 M KCl, pH
7.0 as mobile phase in order to determine the content of monomeric,
aggregated and degraded species in the samples. Sodium dodecyl
sulfate (SDS) polyacrylamide gel electrophoresis (reducing and
non-reducing) was performed to analyze the purity of the complex
preparations with regard to product-related degradation products
and unrelated impurities (for details, see below). Electrospray
ionisation mass spectrometry (ESI-MS) was performed with reduced
(TCEP) samples to confirm the correct mass/identity of each chain
and detect chemical modifications. ESI-MS of the non-reduced
samples was carried out to analyze the nature and quality of the
fully assembled protein and detect potential product-related side
products.
TABLE-US-00021 Method for SDS-PAGE and Coomassie Staining Device:
Invitrogen XCELL SURE LOCK Mini-Cell Gel: 4-20% Tris-Glycine Gel,
Invitrogen EC6025BOX Buffer: Tris-Glycine SDS Running Buffer (10x),
Invitrogen LC2675-5 Sample Tris-Glycine SDS Sample Buffer (2x),
Invitrogen buffer: LC2676 Reducing NuPAGE Sample Reducing Agent
(10x), Invitrogen buffer: NP0004 Molecular Mark 12, MW Standard,
Invitrogen LC5677 Weight Marker:
[0465] The sample was adjusted to a protein concentration of 1
mg/ml with buffer. For sample reduction, the following procedure
was carried out: A reduction buffer including 4 ml Sample buffer
(2.times.) and 1 ml reducing buffer (10.times.) was prepared. The
sample was diluted 1:1 with reduction buffer and incubated for 5
minutes at 70.degree. C.
[0466] The gel electrophoresis was carried out at 125 V for 90
minutes. The gels were stained with SIMPLY BLUE Safe Stain
(Invitrogen, Cat. No. LC6065).
Example 12.5: Comparison of Fab Vs dsFv Fusion Protein-Cytotoxic
Properties
[0467] The cytotoxic potency of a dsFv-PE24 fusion protein format
and a Fab-PE24 format was compared using the same humanized SS1
targeting moiety on three different tumor cell lines (MKN45, H596,
and A431H9). Briefly, cells were seeded on 96 well plates. After
overnight culture, different concentrations of the cFPs were added
to the medium and cells were incubated for 72 h. At the end of
incubation period, cell viability was determined using a
CELLTITERGLOW assay.
[0468] In each case, the dose-response curves and IC50 values for
inhibition of cell viability were similar for the dsFv-PE24 and the
Fab-PE24 format. The molar ratio of the IC50 values is listed in
Table 18. Depending on the cell line tested, the targeted PE24
fusion proteins were several hundred to one thousand fold more
potent than untargeted PE24.
TABLE-US-00022 TABLE 18 Ratio of the molar IC50 values Cell line
dsFv-PE24/Fab-PE24 A431H9 0.37 MKN45 2.3 H596 0.38
Example 12.6: Comparison of Fab Versus dsFv Fusion Protein-Serum
Kinetics
[0469] The serum kinetics of the following three Pseudomonas
exotoxin A (PE)-based anti-mesothelin immunotoxins in SCID beige
mice was compared: SS1dsFv-PE38 (MW: 62.5 kDa), SS1dsFv-PE24 (MW:
49.9 kDa) and SS1Fab-PE24 (MW: 72.2 kDa). The murine SS1 antibody
moiety was used for all constructs. The kinetics were compared at
doses equimolar to 0.2 mg/kg (3.2 nmol/kg) SS1P) corresponding to
0.231 mg/kg SS1Fab-PE24, and 0.160 mg/kg for SS1dsFv-PE24.
[0470] The constructs were administered as a single intravenous
dose, and their serum levels were analyzed at 0.08, 0.5, 1, 1.5, 2,
3, 4, 5, and 7 hours after dosing. Nine mice per group were
administered the study medication, and blood was collected in a
staggered manner at three times per animal by retro-orbital
puncture, resulting in nine time points with n=3 samples. Serum
samples were analyzed by an ELISA that detects only intact test
compounds having the antibody fragment plus the PE part. In this
assay format, the cFP is captured on a MSLN-coated surface and the
PE moiety is detected with a rabbit polyclonal anti-PE antibody and
biotinylated anti-rabbit secondary antibody.
[0471] For each time point, average serum values from three animals
were plotted for the treatment groups together with historical data
from CD2F1 mice. The SS1dsFv-PE24 construct was very rapidly
cleared with a serum half-life of only .about.12 minutes. In
agreement with the historical data, clearance of SS1P was much
slower, resulting in a serum half life of between 35 and 44 minutes
(values derived from measured and historical data, respectively).
The pharmacokinetic properties of the SS1Fab-PE24 construct were
very similar to SS1dsFv-PE38 with a serum half life of 43 minutes
and similar values were also obtained for clearance rate, volume of
distribution, c.sub.max and area under the curve (Table 19 and FIG.
19).
TABLE-US-00023 TABLE 19 Comparison Fab versus dsFv fusion protein-
Serum kinetics Parameter Unit SS1P SS1-Fab-PE24 SS1-dsFv-PE24
C.sub.L mL/(min kg) 2.24 1.53 7.06 V.sub.C mL/kg 84.3 75.4 146
V.sub.SS mL/kg 92 80.5 103 T.sub.1/2 h 0.574 0.716 0.201 C.sub.max
ng/mL 1990 2730 837 AUC ng h/mL 1490 2520 378 (0-inf)
Example 13
[0472] This example demonstrates the humanization of the
anti-mesothelin antibody SS1.
Example 13.1: Design of Humanized Heavy and Light Chain Variable
Regions
[0473] The structures of the VH and the VL domain of the SS1
antibody were modeled in silico, and the model was compared to a
structural database of human VH and VL domains. A panel of the most
structurally similar V domains were chosen for grafting the CDRs of
SS1 onto the human VH and VL domains. In addition, similarities in
the primary sequence were taken into account to narrow down the
choice of the human V domains by aligning the primary sequence of
the VH and VL domain of SS1 to the human V domain repertoire.
Backmutations within the human framework regions to mouse parent
residues were introduced in some humanization variants. Similarly,
mutations in the CDRs were introduced in some variants, where
appropriate, to potentially increase the affinity to the antigen or
to maintain the CDR tertiary structure.
[0474] The designed V domain variants were cloned into heavy chain
and light chain vectors 6318 and 6319 via unique cloning sites to
generate human IgG light and heavy chains. The heavy and light
chain vectors were co-transfected into HEK293 suspension cells in
microtiter culture plates in a matrix manner to obtain cell
cultures expressing full size IgG having all possible light/heavy
chain combinations. After 5 days, cultivation at 37.degree. C., the
supernatants were harvested and purified by Protein A affinity
chromatography in the microtiter scale.
Example 13.2: Cloning of Humanized Heavy and Light Chain Variable
Regions
[0475] Standard methods were used to manipulate DNA as described in
Sambrook, J. et al., supra. The molecular biological reagents were
used according to the manufacturer's instructions. Desired gene
segments were prepared by commercial gene synthesis. The
synthesized gene fragments were cloned into a specified expression
vector. The DNA sequence of the subcloned gene fragments were
confirmed by DNA sequencing.
[0476] Expression vector for the antibody heavy chains: The gene
segments of the designed humanized antibody heavy chain variable
domains were cloned into the specified expression vector via the
unique restriction sites HindIII and XhoI. The expression vector
was designed to express the antibody heavy chain variable domain in
fusion with the human antibody domains CH1, hinge, CH2 and CH3 in
HEK293 cells, resulting in a conventional antibody heavy chain. All
domains were separated by introns. Besides the expression cassette
for the antibody heavy chain, the vector contained: [0477] an
origin of replication from the vector pUC18 which allows
replication of this plasmid in E. coli, [0478] a -lactamase gene
which confers ampicillin resistance in E. coli, [0479] an SV40
promotor and origin for expression of the DHFR selection marker,
[0480] Murine dihydrofolate reductase (DHFR) as selection marker
for antibody expression, and [0481] SV40' early polyadenylation
("early poly A") signal sequence.
[0482] The transcription unit of the antibody heavy chain is
composed of the following elements: [0483] the immediate early
enhancer and promoter from the human cytomegalovirus, [0484] a
5'-untranslated region of a human antibody germline gene, [0485] a
murine immunoglobulin heavy chain signal sequence including a
signal sequence intron (signal sequence 1, intron, signal sequence
2 [L1-intron-L2]), [0486] the VH sequence followed by an intron,
[0487] human CH1, hinge, CH2, CH3 domains separated by introns,
[0488] the bovine growth hormone (bGH) polyadenylation ("poly A")
signal sequence, and [0489] the human gastrin transcription
terminator (HGT).
[0490] Expression vector for the antibody light chains: The gene
segments of the designed humanized antibody light chain variable
domains were cloned into a specified expression vector via the
unique restriction sites BsmI and CelI. The expression vector was
designed to place the antibody light chain variable domain in
fusion with the human antibody domain Ck in HEK293 cells. Both
domains were separated by an intron. Besides the expression
cassette for the antibody light chain, the vector contains: [0491]
an origin of replication from the vector pUC18 which allows
replication of this plasmid in E. coli, and [0492] a -lactamase
gene which confers ampicillin resistance in E. coli.
[0493] The transcription unit of the antibody light chain is
composed of the following elements: [0494] the immediate early
enhancer and promoter from the human cytomegalovirus, [0495] a
5'-untranslated region of the human cytomegalovirus, [0496] an
Intron A sequence of the human cytomegalovirus, [0497] a
5'-untranslated region of a human antibody germline gene, [0498] a
murine immunoglobulin heavy chain signal sequence including a
signal sequence intron (signal sequence 1, intron, signal sequence
2 [L1-intron-L2]) and the unique restriction site BsmI at the 3'
end of L2, [0499] a VL domain followed by an intron, [0500] human
Ck domain, [0501] the bovine growth hormone (bGH) polyadenylation
("poly A") signal sequence, and [0502] Human gastrin transcription
termination factor (HGT).
Example 13.3: Expression of Humanized Antibodies
[0503] Transient transfection of humanized antibody light and heavy
chains: Recombinant humanized antibody variants were generated by
transient transfection of HEK293-Freestyle cells (human embryonic
kidney cell line 293, Invitrogen) grown in suspension. The
transfected cells were cultivated in F17 medium (Gibco) or
Freestyle 293 medium (Invitrogen), either one supplemented with 6
mM glutamine, either ultra-glutamine (Biowhittake/Lonza) or
L-glutamine (Sigma), with 8% CO.sub.2 at 37.degree. C. in shake
flasks in the scale of 2 ml medium in 48-deep-well plates to 1 L
medium in shake flasks. 293-Free transfection reagent
(Novagen/Merck) was used in a ratio of reagent (.mu.l) to DNA
(.mu.g) of 4:3. Light and heavy chains were expressed from two
different plasmids using a molar ratio of light chain to heavy
chain encoding plasmid ranging from 1:2 to 2:1, respectively.
Humanized antibody containing cell culture supernatants were
harvested at day 6 to 8 after transfection. General information
regarding the recombinant expression of human immunoglobulins in,
e.g., HEK293 cells, is given in: Meissner et al., Biotechnol.
Bioeng., 75: 197-203 (2001). The supernatants were purified by
affinity chromatography on MabSelect Sure (GE, Protein A)
equilibrated in PBS. After application of the filtrated
supernatants, the antibodies were eluted with 50 mM sodium acetate,
pH 3.2. The pH of the eluates was adjusted immediately to pH>6
with 2 M Tris/HCl, pH 9.0 followed by dialysis into 20 mM
histidine, 140 mM NaCl, pH 6.0. Antibodies were analyzed by
UV.sub.280, SDS-PAGE and analytical SEC. The sequence was confirmed
by mass spectrometry.
Example 13.4: Characterization of Humanized SS1 Variants
[0504] ELISA screening of humanized SS1 variants: All SS1
humanization variants in the IgG format were screened for affinity
by ELISA. 384 well MaxiSorp microtiter plates were coated with 0.5
.mu.g/ml anti-His antibody (Novagen). After blocking with PBS
buffer supplemented with 2% BSA, 0.1% Tween 20, and 0.2 .mu.g/ml
human/cynomolgus/murine mesothelin (in house/R&D Systems), all
proteins with a His-tag were captured on the plate for one hour.
The plates were washed with PBST Buffer (PBS+0.1% Tween 20) and
dilutions of humanized anti-mesothelin antibodies in PBS were
incubated for 1 hour at room temperature. Binding of antibodies was
detected with HRP conjugated anti human Fc antibody (GE
Healthcare). After a final wash, the plates were incubated with HRP
substrate. Absorbance was measured at 370 nm on an ENVISION plate
reader. EC50 curve fit analysis was performed using XLfit4 analysis
plug-in for EXCEL software (model 205).
[0505] To normalize the obtained values to the IgG titer,
quantitation of human IgG was performed by sandwich ELISA using
streptavidin coated plates. Streptavidin-coated 384 well microtiter
plates (Microcoat) were incubated with a mixture of 0.25 .mu.g/ml
biotinylated anti-human IgG antibody (Jackson Imm. Res.), 0.05
.mu.g/ml anti-human IgG-HRP conjugate (Jackson Imm. Res.), and
dilutions of the humanized ant-mesothelin antibodies. After 1.5
hours incubation at room temperature (RT), plates were washed with
PBS buffer supplemented with 0.1% Tween 20. HRP substrate was
added, and the absorbance was measured at 370 nm on an ENVISION
plate reader. The calculation of data was performed using a human
IgG reference as a standard (in house) for calibration and XLfit4
analysis plug-in for EXCEL software (model 205) for curve fit
analysis.
[0506] In Tables 20-21 below, the ELISA data of all humanization
variants are shown. ELISA/BIACORE binding to huMesothelin (EC50
ng/ml) was measured, and the results are shown in Table 20 (in
house) and Table 21 (R&D). Normalized to IgG titer, this
primary screen identified the variant VL001/VH001 as one of the
combinations with the best EC50 value.
[0507] BiaCore screening of humanized SS1 variants: The best
variants containing CDRs most similar to SS1 were chosen for
kinetics analysis by surface plasmon resonance (SPR). An SPR based
assay has been used to determine the kinetic parameters of the
binding between several MSLN PE cFP humanization variants and human
mesothelin. Therefore, Protein A was immobilized by amine coupling
to the surface of the CM5 biosensor chip. The samples were then
captured, and human mesothelin was injected. The sensor chip
surface was regenerated between each analysis cycle. The
equilibrium constant K.sub.D as well as the rate constants k.sub.d
and k.sub.a were finally gained by fitting the data to a 1:1
langmuir interaction model. About 175 response units (RU) of
Protein A (10 .mu.g/ml) were coupled onto the CM5 sensor chip at pH
4.0 by using an amine coupling kit supplied by GE Healthcare (10
minutes activation). The sample and system buffer was HBS-P+ (0.01
M HEPES, 0.15 M NaCl, 0.005% surfactant P20 sterile-filtered, pH
7.4). The flow cell temperature was set to 25.degree. C., and the
sample compartment temperature was set to 12.degree. C. The system
was primed with running buffer. The protein A binding sites were
saturated with IgGs (about 0.03 .mu.g/mL) to generate similar
capture levels for each sample, by injecting them for 40 seconds at
a flow rate of 10 .mu.l/min. Afterwards, a single 50 nM human
mesothelin solution was injected for 120 seconds at a flow rate of
30 .mu.l/min, followed by a 180 second dissociation phase. Thereby
a relative KD determination allowed a ranking of different MSLN
binders. Each cycle was regenerated with two injections of
glycine-HCl pH 1.5 (30 seconds, 30 .mu.l/min).
[0508] Table 22 below lists the BiaCore data of 12 selected
humanization variants. The final humanization variant VL01/VH01
shows one of the lowest Kd values among all humanization variants.
Table 22 shows the Biacore results for cFP.15438-15457 and
cFP.15438-15459, all comprising humanized VH1. cFP.15438, which
comprises the amino acid sequence of SEQ ID NO: 45, displays the
highest affinity of the humanized variants of SS1 antibody. Thus,
the VH of cFP.15438 provides advantageous binding properties.
[0509] The five best variants were cloned into the Fab-Linker-PE
format containing the published linker and LRO10 as the PE24
variant, expressed, refolded and purified. Cloning, expression,
refolding and purification were carried out as described below for
cFP-0205. The five humanization variants in the cytolytic fusion
format were analyzed for stability at 37.degree. C. for 7 days by
the method of dynamic light scattering described in Example 9.2,
size exclusion chromatography, SDS-PAGE, and mass spectrometry at
distinct time points.
[0510] Size-exclusion chromatography (SE-HPLC) was performed on
TSK-Ge1300SWXL or Superdex 200 columns with a 0.2 M potassium
phosphate buffer comprising 0.25 M KCl (pH 7.0) as the mobile phase
in order to determine the content of monomeric, aggregated, and
degraded species in the samples. Sodium dodecyl sulfate (SDS)
polyacrylamide gel electrophoresis (reducing and non-reducing) was
performed to analyze the purity of the complex preparations with
regard to product-related degradation products and unrelated
impurities (for details, see below). Electrospray ionisation mass
spectrometry (ESI-MS) was performed with reduced (TCEP) samples to
confirm the correct mass/identity of each chain and to detect
chemical modifications. ESI-MS of the non-reduced samples was
carried out to analyze the nature and quality of the fully
assembled protein and to detect potential product-related side
products.
[0511] The active concentration of the Fab fragments within the
cytolytic fusion format after temperature stress at 37.degree. C.
for 7 days was monitored by surface plasmon resonance (SPR).
Mesothelin was immobilized onto the surface of a SPR biosensor. By
injecting the sample into the flow cells of the SPR spectrometer,
it formed a complex with the immobilized mesothelin, resulting in
an increased mass on the sensor chip surface and, therefore, a
higher response (as 1 RU is defined as 1 .mu.g/mm.sup.2).
Afterwards, the sensor chip is regenerated by dissolving the
sample-mesothelin-complex. The gained responses are then evaluated
relative to the response displayed by the reference standard (which
is assumed to be 100% active). First, around 50 resonance units
(RU) of human MSLN (0.75 .mu.g/ml) were coupled on a Cl chip (GE
Healthcare) at pH 4.5 by using the amine coupling kit of GE
Healthcare. The sample and system buffer was HBS-P+(0.01 M HEPES,
0.15 M NaCl, 0.005% surfactant P20 sterile-filtered, pH 7.4). The
flow cell temperature was set to 25.degree. C., and the sample
compartment temperature was set to 12.degree. C. The system was
primed with running buffer. Then, a 5 nM solution of the MSLN PE
cFP construct was injected for 60 seconds at a flow rate of 30
.mu.l/min, followed by a 60 second dissociation phase. Then, the
sensor chip surface was regenerated by two 20 second long
injections of the regeneration solution (0.31M KSCN, 1.22M
MgCl.sub.2, 0.61M urea, 1.22M Gua-HCl, 6.7 mM EDTA) at a flow rate
of 30 .mu.l/min, followed by an extra wash step with buffer and a 5
second stabilization period.
[0512] Stability data were obtained by incubating the 5 best
humanized variants in the Fab-linker-PE24LRO10 format at 37.degree.
C. for 7 days. The results are shown in Table 23. As shown in Table
23, the variant VH01/VL01 was the only variant that showed no
fragmentation after temperature stress. The VL01 promoted recovery
as all VL01 combinations formed only aggregates after temperature
stress but did not precipitate. Negative results of affinity
measurements after temperature stress were due to these aggregates.
Accordingly, the humanization variant VH1/VL1 (SEQ ID NO: 45)/(SEQ
ID NO: 46) was chosen for further development. VH1 (SEQ ID NO: 45)
provided favorable functionality and binding properties. The
combination of VH1 (SEQ ID NO: 45)/VL1 (SEQ ID NO: 46) provided
favorable developability.
TABLE-US-00024 TABLE 20 z a VL 001/ 15457 000/ (SEQ ID 15456 NO:
46) b c mouse humanized mVL 002/ 003/ Past 15458 15459 VH (C99Q)
IMGT_hVK_1_39 IMGT_hVK_3_11 IMGT_hVK_1_39 Mouse 0 000/15437 mVH
Past 20.10 17.80 13.36 20.80 (C44Q) Humanized 1 001/15438
IMGT_hVH_1_46 32.04 20.27 15.57 22.44 (SEQ ID NO: 45) 2 002/15439
VBase_VH1_1 88.85 204.74 32.01 48.39 3 003/15440 VBase_VH1_1 37.76
100.18 31.58 39.86 4 004/15441 VBase_VH1_1 39.46 46.18 20.21 52.31
5 005/15442 Herceptin 71.84 432.87 39.39 70.55 6 006/15443
IMGT_hVH_5_51 196.59 287.08 41.11 144.51 7 007/15444 IMGT_hVH_5_51
155.21 67.47 137.39 71.03 8 008/15445 IMGT_hVH_5_51 431.47 44.39
42.37 17.40 9 009/15446 IMGT_hVH_1_8 118.32 62.23 71.58 31.00 10
010/15447 IGHV4-34-05 41.35 93.85 35.06 33.49 11 011/15448
IMGT_hVH_3_21 44.04 52.11 24.52 41.68 12 012/15449 VBase_VH1_1
30.19 37.51 7.86 47.87 13 013/15450 VBase_VH1_1 70.85 >500.0
58.84 129.80 14 014/15451 VBase_VH1_1 #N/A #N/A #N/A #N/A M1
MSAb-1/ Morphotek 25.65 19.12 13.24 18.82 15452 M2 MSAb-2/
Morphotek 23.42 15.51 33.37 18.46 15453 M3 MSAb-3/ Morphotek 34.70
62.58 17.71 15.82 15454 SS1 HC_SS1/ Pastan 47.15 38.16 26.40 28.85
15436 d m1 m2 m3 ss1 VL 004/ e MSAb-1/ MSAb-2/ MSAb-3/ LC_SS1/
15460 005/ 15462 15463 15464 15455 humanized 15461 Morphotek
Morphotek Morphotek Pastan Hercept. IMGT_hVK_1_39 PAT PAT PAT PAT
Mouse 0 32.72 20.15 16.89 26.38 13.89 17.42 Humanized 1 28.95 30.31
33.50 21.78 21.23 27.22 2 38.63 103.46 181.39 81.92 47.73 271.77 3
63.66 70.03 26.60 108.18 39.95 230.87 4 112.42 68.93 73.53 71.82
89.99 270.06 5 94.99 119.52 26.06 326.88 60.33 >500.0 6 466.56
163.55 >500.0 83.61 78.58 52.29 7 >500.0 69.42 210.52 89.05
182.10 181.13 8 143.88 25.90 20.03 16.34 37.09 87.91 9 230.84 68.65
103.29 97.08 80.73 44.37 10 135.83 95.84 66.42 65.63 26.84 235.42
11 54.65 62.08 15.60 124.88 35.08 47.05 12 36.40 61.27 30.13 35.53
20.68 86.50 13 111.42 132.05 16.51 204.88 33.20 >500.0 14 #N/A
#N/A #N/A #N/A #N/A #N/A M1 33.79 21.71 26.82 13.24 17.05 7.37 M2
30.84 30.16 39.31 23.75 35.77 30.54 M3 64.02 53.63 117.75 19.86
42.60 45.23 SS1 60.38 37.42 29.65 29.79 14.77 41.13
TABLE-US-00025 TABLE 21 z a VL 001/ 15457 000/ (SEQ ID 15456 NO:
46) b c mouse humanized mVL 002/ 003/ Past 15458 15459 VH (C99Q)
IMGT_hVK_1_39 IMGT_hVK_3_11 IMGT_hVK_1_39 Mouse 0 000/15437 mVH
Past 24.93 18.25 14.91 16.97 (C44Q) Humanized 1 001/15438
IMGT_hVH_1_46 22.81 15.55 16.22 21.03 (SEQ ID NO: 45) 2 002/15439
VBase_VH1_1 20.80 30.71 9.67 22.61 3 003/15440 VBase_VH1_1 11.17
64.84 21.95 24.52 4 004/15441 VBase_VH1_1 13.30 18.79 11.38 20.34 5
005/15442 Herceptin 57.64 75.30 21.79 26.38 6 006/15443
IMGT_hVH_5_51 37.98 68.72 17.00 31.68 7 007/15444 IMGT_hVH_5_51
30.92 32.33 50.56 47.93 8 008/15445 IMGT_hVH_5_51 27.84 32.16 13.63
17.70 9 009/15446 IMGT_hVH_1_8 37.15 20.48 23.00 9.24 10 010/15447
IGHV4-34-05 17.19 36.94 18.55 3.79 11 011/15448 IMGT_hVH_3_21 17.85
19.31 12.09 26.23 12 012/15449 VBase_VH1_1 26.50 18.36 4.84 25.45
13 013/15450 VBase_VH1_1 17.11 48.46 26.21 32.81 14 014/15451
VBase_VH1_1 #N/A #N/A #N/A #N/A M1 MSAb-1/ Morphotek 16.76 26.05
10.85 15.40 15452 M2 MSAb-2/ Morphotek 18.94 13.24 25.61 18.06
15453 M3 MSAb-3/ Morphotek 43.79 80.00 24.10 20.13 15454 SS1
HC_SS1/ Pastan 34.77 37.48 30.64 28.76 15436 d m1 m2 m3 ss1 VL
Z004/ e MSAb-1/ MSAb-2/ MSAb-3/ LC SS1/ 15460 005/ 15462 15463
15464 15455 humanized 15461 Morph Morph Morph Pastan Hercept
IMGT_hVK_1_39 PAT PAT PAT PAT Mouse 0 28.24 19.65 13.30 20.08 16.62
21.59 Humanized 1 14.77 21.75 33.91 21.69 18.48 20.27 2 18.10 23.88
26.61 30.97 26.83 23.16 3 27.66 46.86 11.40 33.78 23.40 43.11 4
20.71 23.06 18.22 20.33 19.35 35.09 5 22.71 32.75 7.46 78.60 41.55
51.40 6 96.41 77.48 59.94 13.32 37.23 9.70 7 97.81 21.06 35.60
49.19 35.21 26.52 8 36.39 14.14 8.96 12.58 15.26 14.19 9 99.49
45.65 13.29 16.81 20.11 11.92 10 33.67 29.20 15.63 19.91 14.16
58.47 11 19.38 25.78 6.71 42.47 25.88 26.04 12 32.87 32.83 22.30
16.38 21.03 30.01 13 17.97 55.13 18.76 40.91 16.60 70.42 14 #N/A
#N/A #N/A #N/A #N/A #N/A M1 27.67 15.26 18.45 10.07 14.15 10.22 M2
18.24 32.68 49.52 33.94 33.72 31.20 M3 57.15 51.29 76.89 21.74
57.13 43.21 SS1 50.76 48.23 24.34 31.68 17.66 46.14
TABLE-US-00026 TABLE 22 Temp KD Antibody Antigen Curve (.degree.
C.) Fit ka kd KD [nM] cFP-0004-0002 Mesothelin Fc = 4-3 25 1:1
Binding 7.88E+05 2.39E-04 3.04E-10 0.30 cFP-0006-0002 Mesothelin Fc
= 4-3 25 1:1 Binding 9.29E+05 2.62E-04 2.83E-10 0.28
cFP.15438-15457 Mesothelin Fc = 4-3 25 1:1 Binding 8.39E+05
2.20E-04 2.63E-10 0.26 cFP.15438-15459 Mesothelin Fc = 4-3 25 1:1
Binding 7.13E+05 1.97E-04 2.77E-10 0.28 cFP.15438-15460 Mesothelin
Fc = 4-3 25 1:1 Binding 4.92E+05 1.63E-04 3.31E-10 0.33
cFP.15442-15457 Mesothelin Fc = 4-3 25 1:1 Binding 2.15E+05
0.001387 6.45E-09 6.45 cFP.15442-15459 Mesothelin Fc = 4-3 25 1:1
Binding 2.25E+05 0.002445 1.09E-08 10.89 cFP.15442-15460 Mesothelin
Fc = 4-3 25 1:1 Binding 1.42E+05 0.002221 1.57E-08 15.70
cFP.15447-15457 Mesothelin Fc = 4-3 25 1:1 Binding 6.31E+05
9.76E-04 1.55E-09 1.55 cFP.15447-15459 Mesothelin Fc = 4-3 25 1:1
Binding 5.14E+05 0.001916 3.73E-09 3.73 cFP.15447-15460 Mesothelin
Fc = 4-3 25 1:1 Binding 3.55E+05 0.002069 5.82E-09 5.82
cFP.15448-15457 Mesothelin Fc = 4-3 25 1:1 Binding 1.77E+05
0.001729 9.79E-09 9.79 cFP.15448-15459 Mesothelin Fc = 4-3 25 1:1
Binding 1.73E+05 0.001909 1.11E-08 11.05 cFP.15448-15460 Mesothelin
Fc = 4-3 25 1:1 Binding 1.12E+05 0.00216 1.93E-08 19.32
TABLE-US-00027 TABLE 23 T.sub.agggreagetion Target Stress effect VL
VH [.degree. C.] Recovery SEC SDS-PAGE ESI-MS d ESI-MS d&r
binding on binding VL01 VH10 40 + HMW Fragmentation Fragmentation.
Fragmentation. +/- HMW VL03 VH01 ~35 - LMW Fragmentation.
Fragmentation. Fragmentation. + +/- VL01 VH01 37 + HMWs No No No +
HMW fragmentation fragmentation fragmentation VL03 VH10 37 - HMW
+/- Fragmentation. Fragmentation. +/- +/- VL04 VH01 34 - LMW +/- No
No + + fragmentation fragmentation
Example 14
[0513] This example demonstrates the cloning, expression,
refolding, and purification of chimeric deimmunized PE LOR10-456A
as a Fab fusion with humanized anti-mesothelin SS1 (cFP-0205).
[0514] The chimeric PE anti-mesothelin molecule cFP-0205 was
obtained after cloning, expression, refolding, and purification.
cFP-0205 (also referred to as R205 or RG7787) comprises amino acid
sequences SEQ ID NO: 39 and 40.
[0515] Cloning of cFP-0205: For the expression of cFP-0205, the E.
coli host/vector system which enables an antibiotic-free plasmid
selection by complementation of an E. coli auxotrophy (PyrF) was
employed (EP 0 972 838 and U.S. Pat. No. 6,291,245). Standard
methods were used to manipulate DNA as described in Sambrook, J. et
al., supra. The molecular biological reagents were used according
to the manufacturer's instructions. Desired gene segments were made
by commercial gene synthesis. The synthesized gene fragments were
cloned into a specified expression vector. The DNA sequences of the
subcloned gene fragments were confirmed by DNA sequencing.
[0516] The expression plasmids for the production of the light
chain (LC) and the heavy chain (HC), respectively, were prepared as
follows: The LC Plasmid 15496 is an expression plasmid for the
expression of an antibody light chain in E. coli. It was generated
by ligating the antibody VL domain fragment into the vector using
the NdeI/BsiWI restriction sites.
[0517] The light chain E. coli expression plasmid comprises the
following elements: [0518] the origin of replication from the
vector pBR322 for replication in E. coli (corresponding to
positions 2517-3160 according to Sutcliffe et al., Quant. 43: 77-90
(1979), [0519] the URA3 gene of Saccharomyces cerevisiae coding for
orotidine 5'-phosphate decarboxylase (Rose et al., Gene, 29:
113-124 (1984), which allows plasmid selection by complementation
of E. coli pyrF mutant strains (uracil auxotrophy), [0520] the
antibody light chain expression cassette, comprising [0521] the T5
hybrid promoter (T5-PN25/03/04 hybrid promoter according to Bujard
et al., Methods. Enzymol., 155: 416-433 (1987) and Stueber et al.,
Immunol. Methods IV, 121-152 (1990) including a synthetic ribosomal
binding site according to Stueber et al. (supra), [0522] the
antibody light chain variable domain comprising the CDRs of SS1,
[0523] the human Ck domain, [0524] two bacteriophage-derived
transcription terminators, the .lamda.-T0 terminator (Schwarz et
al., Nature, 272: 410-414 (1978) and the fd-terminator (Beck et
al., Gene, 1-3: 35-58 (1981), and [0525] the lad repressor gene
from E. coli (Farabaugh, P. J., Nature, 274 (1978) 765-769).
[0526] The HC Plasmid 18023 is an expression plasmid for the
expression of a fusion protein including an antibody heavy chain, a
linker containing a furin cleavage site, and a mutant of domain III
of Pseudomonas Exotoxin A, in E. coli. It was generated by ligation
of the VH domain fragment into the vector using the NdeI/BsrGI
restriction sites. The specific PE variant fragment was exchanged
using the BsrGI/BsiWI restriction sites.
[0527] The cytolytic fusion protein heavy chain E. coli expression
plasmid comprises the following elements: [0528] the origin of
replication from the vector pBR322 for replication in E. coli
(corresponding to positions 2517-3160 according to Sutcliffe et
al., Quant. Biol., 43: 77-90 (1979), [0529] the URA3 gene of
Saccharomyces cerevisiae coding for orotidine 5'-phosphate
decarboxylase (Rose et al., Gene, 29: 113-124 (1984), which allows
plasmid selection by complementation of E. coli pyrF mutant strains
(uracil auxotrophy), [0530] the heavy chain-PE domain III fusion
protein expression cassette, comprising: [0531] the T5 hybrid
promoter (T5-PN25/03/04 hybrid promoter according to Bujard et al.,
Methods. Enzymol., 155: 416-433 (1987) and Stueber et al., Immunol.
Methods IV, 121-152 (1990), including a synthetic ribosomal binding
site according to Stueber et al. (supra), [0532] the antibody heavy
chain variable domain comprising the CDRs of SS1, [0533] the human
CH1 domain, [0534] the linker comprising a furin cleavage site,
[0535] the mutant variant of Pseudomonas Exotoxin A domain III,
[0536] two bacteriophage-derived transcription terminators, the
.lamda.-T0 terminator (Schwarz et al., Nature, 272: 410-414 (1978)
and the fd-terminator (Beck et al., Gene, 1-3: 35-58 (1981), and
[0537] the lad repressor gene from E. coli (Farabaugh, Nature, 274:
765-769 (1978).
[0538] Expression of cFP-0205 in E. coli: The E. coli K12 strains
CSPZ-6 (thi-1, .DELTA.pyrF) and CSPZ-13 (thi-1, .DELTA.ompT,
.DELTA.pyrF) were transformed by electroporation with the
expression plasmid nos. 15496 and 18023, respectively. The
transformed E. coli cells were first grown at 37.degree. C. on agar
plates. For each transformation, a colony picked from this plate
was transferred to a 3 mL roller culture and grown at 37.degree. C.
to an optical density of 1-2 (measured at 578 nm). Then 1000 .mu.l
of culture were mixed with 1000 .mu.l sterile 86%-glycerol and
immediately frozen at -80.degree. C. for long term storage. The
correct product expression of these clones was first verified by
small scale shake flask experiments and analyzed with SDS-Page
prior to the transfer to the 10 L fermenter.
Pre Cultivation:
[0539] For pre-fermentation, a chemically defined medium
(CD-PCMv2.60) was used: NH.sub.4Cl 1.25 g/l,
K.sub.2HPO.sub.4*3H.sub.2O 18.3 g/l, citrate 1.6 g/l, L-Methionine
0.20 g/l, Glucose*H.sub.2O 8.0 g/l, trace elements solution 0.5
ml/l, MgSO.sub.4*7H.sub.2O 0.86 g/l, and Thiamin*HCl 17.5 mg/l. The
trace elements solution contained FeSO.sub.4*7H.sub.2O 10.0 g/l,
ZnSO.sub.4*7H.sub.2O 2.25 g/l, MnSO.sub.4*H.sub.2O 2.13 g/l,
H.sub.3BO.sub.3 0.50 g/l, (NH.sub.4)6Mo.sub.7O.sub.24*4H.sub.2O 0.3
g/l, CoCl.sub.2*6H.sub.2O 0.42 g/l, CuSO.sub.4*5H.sub.2O 1.0 g/l
dissolved in 0.5M HCl.
[0540] For pre-fermentation, five 1000 mL shake-flasks with four
baffles filled with 220 mL of medium were inoculated with 1.0 mL
each out of a primary seed bank ampoule. The cultivation was
performed on a rotary shaker for 11-12 hours at 37.degree. C. and
170 rpm until an optical density (578 nm) of 7 to 9 was obtained.
The shake flasks were pooled, and the optical density was
determined. The inoculum volume was calculated with Vinoc.=1000
mL*5/ODPC and is dependent on the optical density of the pre
cultivation to inoculate the batch medium of each 100 L bioreactor
run with an equal amount of cells.
100 L scale fermentation:
[0541] For fermentation in a 100 L fermenter (Sartorius, Melsungen,
Germany), the following chemically defined batch medium was used:
KH.sub.2PO.sub.4 1.59 g/l, (NH.sub.4).sub.2HPO.sub.4 7.45 g/l,
K.sub.2HPO.sub.4*3H.sub.2O 13.32 g/l, citrate 2.07 g/l,
L-methionine 1.22 g/l, NaHCO.sub.3 0.82 g/l, trace elements
solution 7.3 ml/l, MgSO.sub.4*7 H.sub.2O 0.99 g/l, thiamine*HCl
20.9 mg/l, glucose*H.sub.2O 29.3 g/l, biotin 0.2 mg/1, 1.2 ml/l
Synperonic 10% anti foam agent. The trace elements solution
contained FeSO.sub.4*7H.sub.2O 10 g/l, ZnSO.sub.4*7H.sub.2O 2.25
g/l, MnSO.sub.4*H.sub.2O 2.13 g/1, CuSO.sub.4*5H.sub.2O 1.0 g/l,
CoCl.sub.2*6H.sub.2O 0.42 g/l,
(NH.sub.4)6Mo.sub.7O.sub.24*4H.sub.2O 0.3 g/l, H.sub.3BO.sub.3 0.50
g/l solubilized in a 0.5M HCl solution.
[0542] The feed 1 solution contained 700 g/l glucose*H.sub.2O, 7.4
g/l MgSO.sub.4*7 H.sub.2O and 0.1 g/l FeSO.sub.4*7H.sub.2O. Feed 2
comprised KH.sub.2PO.sub.4 52.7 g/l, K.sub.2HPO.sub.4*3H.sub.2O
139.9 g/l and (NH.sub.4).sub.2HPO.sub.4 66.0 g/l. All components
were dissolved in deionized water. The alkaline solution for pH
regulation was an aqueous 12.5% (w/v) NH.sub.3 solution
supplemented with 11.25 g/l L-methionine.
[0543] Starting with 42 L of sterile batch medium plus the
calculated inoculum of the pre cultivation the batch, fermentation
was performed at 31.degree. C., pH 6.9.+-.0.2, 800 mbar back
pressure and an initial aeration rate of 50 l/min. The relative
value of dissolved oxygen (pO.sup.2) was kept at 50% throughout the
fermentation by increasing the stirrer speed up to 1000 rpm. After
the initially supplemented glucose was depleted, indicated by a
steep increase in dissolved oxygen values, the temperature was
shifted to 37.degree. C. when producing the light chain or kept
constant when producing the heavy chain construct and 15 minutes
later, the fermentation entered the fed-batch mode with the start
of both feeds (600 and 140 g/h respectively). The rate of feed 2
was kept constant, while the rate of feed 1 was increased stepwise
with a predefined feeding profile from 600 to finally 1400 g/h when
producing the light chain or 1600 g/h when producing the heavy
chain construct within 6-7 hours. When carbon dioxide off gas
concentration leveled above 2%, the aeration rate was stepwise
increased by 10 L/min from 50 to 100 l/min within 5 hours. The
expression of recombinant target proteins as insoluble inclusion
bodies located in the cytoplasm was induced by the addition of 24 g
IPTG at an optical density of approx. 40 for the variable light
Fab-chain and 120 for the variable heavy Fab-chain.
[0544] After 24 hours of cultivation, the whole broth was cooled
down to 4-8.degree. C. and stored overnight in the fermenter
vessel. The bacteria were harvested via centrifugation with a
flow-through centrifuge (13,000 rpm, 13 l/h) or a separator and the
obtained biomass was stored at -20.degree. C. until further
processing (cell disruption) or immediately processed for inclusion
body isolation.
Analysis of Product Formation:
[0545] Samples were drawn from the fermenter, one prior to
induction and the others at dedicated time points after induction
of protein expression. The samples were analyzed by
SDS-Polyacrylamide gel electrophoresis. For every sample, the same
amount of cells (OD.sub.Target=10) was suspended in 5 mL PBS buffer
and disrupted via sonication on ice. Then, 100 .mu.L of each
suspension were centrifuged (15,000 rpm, 5 minutes) and each
supernatant was withdrawn and transferred to a separate vial. This
was to discriminate between soluble and insoluble expressed target
protein. To each supernatant (=soluble protein fraction) 100 .mu.L
and to each pellet (=insoluble protein fraction) 200 .mu.L of SDS
sample buffer (Laemmli, Nature, 227: 680-685 (1970) were added.
Samples were heated for 15 minutes at 95.degree. C. under intense
mixing to solubilize and reduce all proteins in the samples. After
cooling to room temperature, 5 .mu.L of each sample were
transferred to a 4-20% TGX Criterion Stain Free polyacrylamide gel
(Bio-Rad). Additionally, 5 .mu.l molecular weight standard
(Precision Plus Protein Standard, Bio-Rad) and 3 amounts (0.3
.mu.l, 0.6 .mu.l and 0.9 .mu.l) quantification standard with known
target protein concentration (0.1 mg/.mu.1) were applied.
[0546] The electrophoresis was run for 60 Minutes at 200 V and,
thereafter, the gel was transferred the GELDOC EZ Imager (Bio-Rad)
and processed for 5 minutes with UV radiation. Gel images were
analyzed using Image Lab analysis software (Bio-Rad). With the
three standards, a linear regression curve was calculated with a
coefficient of >0.99 and the concentrations of target protein in
the original sample were calculated. The yield was up to 3-4 g/L of
the Fab-light chain and 10-12 g/L for the Fab-heavy chain PE
fusion.
Inclusion Body Preparation:
[0547] The inclusion body preparations (IBP) of the 100 L
fermentations were started directly after the harvest of the
bacteria with the re-suspension of the harvested bacteria cells in
buffer 1 (12.1 g/L Tris, 0.246 g/L MgSO.sub.4*7H.sub.2O, 12 mL/L
25%-HCl). The buffer volume was calculated in dependence of the dry
matter content of the biomass. Lysozyme (100 kU/mg, 0.12 mg/gDCW)
and a small amount of benzonase (5 U/gDCW) were added. Then, the
suspension was homogenized at 900 bar (APV Rannie 5, 1 pass) to
disrupt the bacteria cells followed by the addition further
benzonase (30 U/gDCW) and an incubation for 30 minutes at
30-37.degree. C. Then, the first wash buffer (60 g/L Brij, 87.6 g/L
NaCl, 22.5 g/L EDTA, 6 mL/L 10N NaOH) was added and again the
suspension was incubated for 30 minutes. The following separation
step (CSCE, Westfalia) led to an inclusion body slurry which was
re-suspended in the second wash buffer (12.1 g/L Tris, 7.4 g/L
EDTA, 11 mL/L 25%-HCl) and incubated for 20 minutes. A further
separation step harvested the inclusion bodies to a single use,
sterile, plastic bag, which was immediately transferred to the DSP
department.
Results:
[0548] The fermentations of the light chain yielded an optical
density measured at 578 nm of 170-190 and a final product yield of
10-12 g/L. The fermentations of the heavy chain toxin fusion
yielded an optical density measured at 578 nm of 210-230 and a
final product yield of 3-4.5 g/L.
[0549] Refolding and purification of cFP-0205: Inclusion bodies of
HC-PE24 and LC were solubilized separately in 8 M
guanidinium-hydrochloride, 100 mM Tris/HCl, 1 mM EDTA, pH 8.0+100
mM dithiothreitol (DTT) overnight at RT (1 g IB in 5 mL).
Solubilizates were adjusted to pH 3 and centrifuged, and the pellet
was discarded. After extensive dialysis against 8 M
guanidinium-HCl, 10 mM EDTA, pH 3.0 to remove DTT, the total
protein concentration was determined using the Biuret method. The
purity of the HC and LC content was estimated via SDS-PAGE.
[0550] Solubilizates were diluted at a 1:1 molar ratio in
renaturation buffer containing 0.5 M arginine, 2 mM EDTA, pH 10+1
mM GSH/GSSG, respectively, at 2-10.degree. C. The target protein
concentration was increased stepwise from 0.1 g/L up to 0.5 g/L,
with an incubation time of 2 hours between each dose. After up to 5
pulses, the renaturation solution was kept at 2-10.degree. C.
overnight.
[0551] The renaturate was diluted with H.sub.2O to <3 mS/cm and
pumped onto an anion exchange column (AIEX) equilibrated in 20 mM
Tris/HCl, pH 7.4. After washing the column with equilibration
buffer, the protein was eluted with a gradient up to 20 mM
Tris/HCl, 400 mM NaCl, pH 7.4. Peak fractions containing Fab-PE24
were pooled, concentrated and applied onto a preparative Size
Exclusion Column (SEC) in 20 mM His, 140 mM NaCl, pH 5.5 or 6.0 to
remove aggregates, fragments, and E. coli proteins. The final
protein pool was adjusted to the required protein concentration and
analyzed via SDS-PAGE or CE-SDS, analytical SEC and UV.sub.280.
Identity was confirmed by mass spectrometry.
[0552] Protein Analysis of cFP-0205: Sample analysis was carried
out as described above.
Characterization of Final Deimmunized PE Variant as Fab Fusion with
Humanized Anti-Mesothelin SS1 (cFP0205).
[0553] Cytotoxicity and in vitro tumor cell killing: The cytotoxic
potency of cFP0205 was compared to that of SS1P in cell viability
assays with different cancer cell lines and primary mesothelioma
cells. The results are shown in Table 24. As shown in Table 24, for
many cancer cell lines, SS1P and cFP0205 had comparable potencies
(difference in IC.sub.50 values .ltoreq.3). However, some cell
lines (e.g., Hu-1 and Hu-2) and also the primary mesothelioma cells
(RH19, RH21) were significantly more sensitive to cFP0205 than to
SS1P (6-10 fold lower IC50 values).
TABLE-US-00028 TABLE 24 SS1P cFP0205 Cell line (IC50 in ng/ml)
(IC50 in ng/ml) Hu-1 2 0.25 Hu-2 0.3 0.04 Hu-3 2.9 2 HAY 1 1.4 AG5
0.3 1.1 L55 3 5 MKN-28 0.5 2 ASPC-1-luc 1.3 2.4 H596 4.6 15.7 RH19
3.7 1.2 RH21 2.3 0.35
Characterization of Final Deimmunized PE Variant as Fab Fusion with
Humanized Anti-Mesothelin SS1 (cFP0205).
[0554] Serum half life: A pilot study was performed in cynomolgus
monkeys (1 male and 1 female) with cFP0205 in order to assess the
pharmacokinetics of single doses. The animals were intravenously
dosed with 0.3 mg/kg of cFP0205. For pharmacokinetics, blood
samples were taken predose, 0.083 (5 minutes, end of infusion), 1,
2, 3, 5, 8, 24, 48 and 168 hours postdose. Levels of free drug
(dashed line) as well as total drug (black squares and solid line)
were determined by different ELISA formats (FIG. 20). For
determining total drug levels, a one-step acid dissociation was
performed before the capturing step on mesothelin coated plates.
The free and total drug levels were plotted over time. For
comparison, historical data with SS1P were also inserted into FIG.
20 (black circles and solid line). These historical data were
generated with a cytotoxic activity assay as a read-out for serum
levels of SS1P. The cytotoxicity assay detects free drug, but also
detects, at least in part, drug bound to soluble mesothelin which
might contribute to the observed activity. The measured free drug
levels for cFP0205 were similar to the first phase of the
historical data with SS1P. The measured total drug levels for
cFP0205 were comparable to the second phase of the kinetic observed
for SS1P. In summary, not only in mice, but also in cynomolgus
monkey, the serum level kinetics of SS1P and cFP0205 were very
comparable.
Characterization of Final Deimmunized PE Variant as Fab Fusion with
Humanized Anti Mesothelin SS1 (cFP0205)
[0555] Reduced off-target toxicity: SCID beige mice with small
subcutaneous tumors of H596 lung cancer cells (average tumor volume
100 mm.sup.3) were dosed with 0.5, 1, 2, and 3 mg/kg cFP0205
3.times./w qod and body weight loss was monitored over one month.
The results are shown in FIG. 21.
[0556] As shown in FIG. 21, the maximally tolerated dose of SS1P in
mice given intravenously 3.times./w qod was 0.4 mg/kg. cFP0205
given with this same regimen was tolerated in SCID beige mice at
doses up to 3 mg/kg. Some body weight loss was observed in all
treatment groups. However, the effect of the 0.5 mg/kg dose of
cFP0205 was indiscriminable from the vehicle control.
Dose-dependently, an increasing loss of body weight occurred with
1, 2, and 3 mg/kg. In the 3 mg/kg group, the maximum weight loss
was 15% and this was observed 4 days after the last application of
cFP0205. In the 2 and 3 mg/kg treatment groups, no further decline
in body weight was observed after the last application. All animals
started to recover body weight from day 5 after the last treatment
onwards. Initial body weight recovery was most pronounced in the 3
mg/kg group. In summary, despite similar pharmacokinetic properties
of both molecules in mice, cFP0205 was tolerated at an almost 10
fold higher dose compared to SS1P.
[0557] A single intravenous dose (short infusion) toxicology study
was done in 8 week old female Wistar Furth rats (150-175 g body
weight) in order to evaluate and compare the off-target toxicity of
SS1P and cFP0205. In particular, the risk of inducing vascular leak
(edema) in the lung caused by the test item was investigated. Three
animals per group received the active substance or vehicle by an
intravenous short infusion at an infusion rate of 0.3 ml/min.
Animals were necropsied 24 hours after dosing. Lung with mainstem
bronchi and liver were macroscopically evaluated, fluid collection
in the lung was assessed, and clinical chemistry assays were
performed on blood samples. The results are shown in Table 25.
TABLE-US-00029 TABLE 25 SS1P CFP0205 Dose (i.v.), n = 3 2 mg/kg 10
mg/kg In-life rales (lung), rolling gait, hunched posture, none
(clinical piloerection and slight bw loss signs, bw) Necropsy
tan-stained thoracic fluid in 2 rats; brown none discoloration of
liver in all 3 rats Fluid Smear mesothelial cells and eosinophils
none Evaluation Clinical Liver: .uparw..uparw..uparw. in ALT (30x),
AST (40x), Liver: Chemistry .gamma.GT, GLDH, SDH; marginal VLS:
.dwnarw. Protein, .dwnarw. albumin (serum SDH .uparw. protein loss)
Hemolysis?: .uparw. bilirubin (but no hematology indication)
.uparw. BUN: poor physical condition (.uparw. protein
catabolism)
The serum half life of SS1P and cFP0205 is expected to be very
similar in rats as shown for mice.
[0558] As shown in Table 25, two out of three rats that were dosed
intravenously with 2 mg/kg of SS1P showed fluid accumulation in the
lungs. All animals in this group showed clear clinical signs of
toxicity and, for all animals, clinical chemistry values were
indicative of severe liver damage. In contrast to this, all three
animals treated with 10 mg/kg of cFP0205 showed no signs of
toxicity. Only in one animal was the value for one of the liver
enzymes slightly elevated. These findings demonstrate that the
cFP0205 molecule causes much less hepatotoxicity and vascular leak
syndrome than the SS1P classical immunotoxin format.
[0559] A pilot toxicology study was performed in cynomolgus monkeys
(1 male and 1 female) with cFP0205 in order to determine the
tolerability of repeated daily doses of the test item following
intravenous administration and to check for potential late onset
toxicity (up to 72 hrs after last repeat-dose). Postdosing
observations of the animals were performed immediately, 0.25, 0.5,
1, 2, and 4 hours after end of dosing. During the dosing phase, the
general behavior and appearance of the animals was observed twice
daily, while body weight, food consumption and feces were analysed
daily.
[0560] Dosing cFP0205 at 1 mg/kg daily for 5 consecutive days was
well tolerated by both animals. No hemorrhaging, acute
inflammation, or ulceration at the injection site were observed.
That the animals showed no clinical signs of toxicity or
non-tolerability firmly established 1 mg/kg/d 5.times. as the
non-severely toxic dose, while the classical immunotoxin format
represented by SS1P had previously been shown to be non-tolerated
at a dose of 0.3 mg/kg/d 5.times. with animals showing persistent
clinical signs of toxicity like hunched posture with tremors,
hypoactivity, and poor appetite. In summary, cFP0205 is much better
tolerated than SS1P not only in mice, but also in cynomolgus
monkeys, a fully cross-reactive species for the targeting moieties
of these immunoconjugates.
Characterization of Final Deimmunized PE Variant as Fab Fusion with
Humanized SS1 (cFP0205)
[0561] cFP0205 and SS1P were labeled with Cy5 on free amino groups.
Outstaged SCID beige mice with subcutaneous H596 tumors were
intravenously injected (4 mice/group) at a dose of 2 mg/kg with the
2 fluorescent-labeled molecules. After 6 hours, the animals were
sacricifed. The lung, liver, and spleen were formalin-fixed,
embedded and sectioned. Fluorescence images of representative
sections of these organs were taken at different magnification. The
results are shown in FIGS. 22A-22L.
[0562] As shown in FIGS. 22A-22L, SS1P treatment led to pronounced
fluorescence staining of lung and spleen tissue and massively
stained what appeared to be the reticuloendothelial system in the
liver. In contrast to this, there was no staining of lung tissue
observed upon cFP0205 application. Also, staining of the spleen was
much less pronounced and the staining pattern was different from
that of SS1P treated animals. Also in the liver, the staining with
cFP0205 was drastically reduced compared to SS1P. Only isolated
single cells that appear to be Kupffer cells were fluorescently
stained. This suggests that the lower off-target toxicity of a
Fab-PE24 compared to a dsFv-PE38 is due to differences in normal
tissue distribution.
Example 15
[0563] This example demonstrates the production of anti-glypican
3-PE variant chimeric molecules.
[0564] An anti-glypican 3-PE variant chimeric molecule comprising a
linker comprising the amino acid sequence of SEQ ID NO: 36, a PE
comprising SEQ ID NO: 37 (L010R-456A), the variable heavy chain
domain VH of SEQ ID NO: 61, and the variable light chain domain of
SEQ ID NO: 62 (GPC3-PE24-LR-LO10R-456A-long-linker) was prepared by
a method analogous to the method of preparing the anti-mesothelin
PE variant chimeric molecule cFP-077 described in Example 12 (from
cloning to purification).
[0565] An anti-glypican 3-PE variant chimeric molecule comprising a
linker comprising the amino acid sequence of SEQ ID NO: 36, a PE
comprising SEQ ID NO: 37 (LO10R-456A), the variable heavy chain
domain VH of SEQ ID NO: 77, and the variable light chain domain of
SEQ ID NO: 78 was also prepared by a method analogous to the method
of preparing the anti-mesothelin PE variant chimeric molecule
cFP-077 described in Example 12 (from cloning to purification).
Example 16
[0566] This example demonstrates the cytotoxic properties of the
anti-glypican 3-PE variant chimeric molecule
GPC3-PE24-LR-LO10R-456A-long-linker as compared to
GPC3-PE24-LR-LO10R.
[0567] The cytotoxic potency of GPC3-PE24-LR-LO10R was compared to
that of GPC3-PE24-LR-LO10R-456A-long-linker on the glypican
3-positive liver cancer cell line HepG2. Briefly, HepG2 cells were
seeded at a density of 6000 cells/well on 96 well plates. After
overnight culture, different concentrations of the cFPs were added
to the medium, and the cells were incubated for 72 hours. At the
end of incubation period, cell viability was determined using a
CELLTITERGLOW assay. The results are shown in Table 26.
[0568] As shown in Table 26, comparable dose-response curves for
the inhibition of cell viability were observed on HepG2 cells for
both molecules. The IC.sub.50 value of the more completely
de-immunized PE variant with the 456A mutation and the longer
linker was even slightly lower than that of the LR-LO10R variant
with the short linker. Non-targeted ("free PE24") or mistargeted
PE24 ("CD33-Fab-PE"; HepG2 cells do not express CD33) did not show
any significant reduction of cell viability at concentrations
<30 .mu.M. In summary, the more completely de-immunized
GPC3-targeted LR-LO10R-456A-long-linker variant had the same or
even slightly better cytotoxic potency as compared to the
GPC3-targeted LR-LO10R variant with the shorter linker. Due to the
additional 456A mutation within the PE, all B-cell epitopes were
removed.
TABLE-US-00030 TABLE 26 IC50 in CELLTITERGLOW assay with HepG2
Fusion protein (expressing glypican-3)
GPC3-PE24-LR-LO10R-short-linker 0.68 nM
GPC3-PE24-LR-LO10R-456A-long-linker 0.54 nM Non-targeted PE24
>>30 .mu.M CD33-PE24-LR-LO10R-short-linker no effect up to 30
.mu.M
Example 17
[0569] This example demonstrates the cytotoxicity of deimmunized PE
fusion proteins having a A458R mutation.
[0570] The cytotoxicity of SS1P, SS1-LR-GGS, SS1-LR-GGS-LO10,
SS1-LR-GGS-LO10-A458R, and SS1-LR-GGS-LO10-A458-456A was measured
using the WST method. The results are shown in Table 27.
TABLE-US-00031 TABLE 27 A431/H9 HAY M30 Hu-Meso AGS SS1P 0.05(N =
14) 1.49(N = 6) 0.28(N = 5) 0.48(N = 5) 0.36(N = 5) SS1-LR-GGS
0.16(N = 2) ND ND ND 0.3 SS1-LR-GGS-L010 0.17(N = 5) 0.68 3.99 0.11
.sup. 11(N = 2) SS1-LR-GGS-L010-A458R 0.13(N = 18) 0.39(N = 11)
0.57(N = 3) 0.03(N = 4) 1.05(N = 9) SS1-LR-GGS-L010-A458R- 0.07(N =
4) 0.1(N = 2) 0.58(N = 3) ND 0.5 456A
[0571] As shown in Table 27, the A458R mutation increased the
activity of SS1-LR-GGS-L010 on several cell lines. The addition of
the 456A mutation further increased activity on several cell lines.
A431/H9 is an epidermoid carcinoma expressing mesothelin, and Hay
is a mesothelioma line. M30 is also a mesothelioma cell line, and
AGS is a stomach cancer cell line. Hu-Meso are cells from a
mesothelioma patient that were placed in culture for a few
months.
Example 18
[0572] This example demonstrates the treatment of HCC70 tumors
using RG7787.
[0573] Female nude mice were innoculated into the intramammary fat
pad with HCC70 cells at time 0. HCC70 is a breast cancer cell line.
Intravenous treatment with RG7787 (2.5 mg/kg IV) or vehicle was
begun on day 6 and continued every other day for a total of 5 doses
(arrows). The size of the tumor was measured. The results are shown
in FIG. 24.
[0574] As shown in FIG. 24, the tumor size of mice treated with
RG7787 was decreased as compared to that of control mice (vehicle).
There is a statistically significant difference between the 2
groups beginning at day 10, with p<0.00001 by day 14.
Example 19
[0575] This example demonstrates the treatment of KLM1 tumors in
mice using a combination of paclitaxel and RG7787.
[0576] Four week, four day old mice were injected with
4.times.10.sup.6 KLM1 cells. KLM1 is a pancreatic cancer cell line
that expresses mesothelin. Thirteen days later, mice were untreated
or treated with paclitaxel (50 mg/kg), RG7787 (2.5 mg/kg), or a
combination of RG7787 (2.5 mg/kg) and paclitaxel (50 mg/kg). Tumor
size was measured for up to 89 days after treatment. The results
are shown in FIG. 23.
[0577] As shown in FIG. 23, the tumor size of mice treated with the
combination of paclitaxel and RG7787 was decreased as compared to
that of control mice (untreated) or that of the mice treated with
paclitaxel alone or RG7787 alone.
Example 20
[0578] This example demonstrates the treatment of HCC70 tumors in
mice using a combination of paclitaxel and RG7787.
[0579] Female athymic nude mice were inoculated with HCC70 cells at
time 0. Animals were treated with vehicle, RG7787 with IP vehicle
injection, paclitaxel with IV vehicle injection, or paclitaxel and
RG7787 combination. Paclitaxel (50 mg/kg) was administered by IP
injection on days marked with long arrows. RG7787 (2.5 mg/kg) was
administered IV on days indicated by short arrows. Mean tumor
volumes for n=5 vehicle and n=6 mice treated with RG7787,
paclitaxel or the combination are indicated by the markers. The
results are shown in FIG. 25.
[0580] As shown in FIG. 25, the tumor size of mice treated with the
combination of paclitaxel and RG7787 was decreased as compared to
that of control mice (vehicle) or that of the mice treated with
paclitaxel alone or RG7787 alone.
Example 21
[0581] This example demonstrates the treatment of MKN-28 tumors in
mice using a combination of paclitaxel and R205.
[0582] Athymic nude mice were inoculated with MKN-28 cells at time
0. MKN-28 is a gastric cancer cell line which expresses mesothelin.
Animals were untreated (UT) or treated with Roche 205 (R205 or 205)
alone, paclitaxel (taxol) alone, or a combination of R205 and
paclitaxel. Tumor size was measured. The results are shown in FIG.
26.
[0583] As shown in FIG. 26, the tumor size of mice treated with the
combination of paclitaxel and R205 was decreased as compared to
that of control mice (untreated) or that of the mice treated with
paclitaxel alone or R205 alone.
Example 22
[0584] This example demonstrates the in vivo antitumor activity of
LMB-T18. Severe combined immunodeficient (SCID) mice were implanted
with CA46 cells. Seven days later, when tumors reached over 100
mm.sup.3 in size, the mice were treated with PBS (control) or
LMB-T18 (5 mg/kg.times.4 or 7.5 mg/kg.times.3) intravenously. Mice
receiving 5.0 mg/kg were treated four times, on days 7, 9, 11 and
16, and the higher dose group was treated with 7.5 mg/kg three
times on days 7, 9 and 11. Marked tumor regressions were observed
in all mice (FIG. 27E) with only minor weight loss (average of 6%).
5/7 mice treated with 5.0 mg/kg maintained complete tumor
regression on day 33, and 3/7 maintained complete tumor regression
in the 7.5 mg/kg group. To assess the nonspecific toxicity of
LMB-T18, six tumor bearing mice were treated intravenously with two
doses of 10 mg/kg QOD. One mouse showed severe weight loss and was
euthanized.
Example 23
[0585] This example demonstrates that LMB-T18 has greatly
diminished T cell activation.
[0586] To determine if LMB-T18 had a decrease in T cell stimulation
or if new T cell epitopes were created by the mutations, PBMCs were
stimulated from the highest responder donors (n=13) and HCL and
mesothelioma patients (n=7) with MP or LMB-T18. Cells were
re-stimulated with the 39 novel peptides representing the
differences between MP and LMB-T18. A decrease of 90% in donor T
cell activation (p<0.0001 in Student T test) was observed. Even
in patients with activated T cells, there was an 83% decrease.
(p<0.0001 in Student T test). Furthermore, no new epitopes were
created by the mutations.
Example 24
[0587] This example demonstrates that LMB-T18 has reduced binding
to anti-sera from patients.
[0588] The antigenicity of LMB-T18 was evaluated by comparing the
reactivity of MP, HA22-LR and LMB-T18 with serum from patients with
neutralizing antibodies to MP. Binding was measured using ICC-ELISA
with serum from 13 MP treated patients and is shown in FIG. 27F. It
was found that like HA22-LR, LMB-T18 had a significantly reduced
binding to serum compared to MP (p<0.001 one-way ANOVA). It was
also found that LMB-T18 had significantly lower binding compared to
HA22-LR (p<0.001 one-way ANOVA), indicating that the mutations
in LMB-T18 reduced the binding to anti-sera.
Example 25
[0589] This example demonstrates the production of anti-FAP-PE
variant chimeric molecules.
[0590] Three anti-FAP-PE variant chimeric molecules comprising:
[0591] (a) a linker comprising the amino acid sequence of SEQ ID
NO: 36, a PE comprising SEQ ID NO: 37 (L010R-456A)), the variable
heavy chain domain VH of SEQ ID NO: 93, and the variable light
chain domain of SEQ ID NO: 94 (iFAP-PE24-LR-LO10R-456A-long-linker)
[0592] (b) a linker comprising the amino acid sequence of SEQ ID
NO: 36, a PE comprising SEQ ID NO: 37 ((L010R-456A)), the variable
heavy chain domain VH of SEQ ID NO: 93, and the variable light
chain domain of SEQ ID NO: 294
(LCL4-PE24-LR-LO10R-456A-long-linker) (including the VL variant of
SEQ ID NO: 290), and [0593] (c) a linker comprising the amino acid
sequence of SEQ ID NO: 36, a PE comprising SEQ ID NO: 37 (T-20),
the variable heavy chain domain VH of SEQ ID NO: 93, and the
variable light chain domain of SEQ ID NO: 290 (LCL4-T20); were
prepared by a method analogous to the method of preparing the
anti-mesothelin PE variant chimeric molecule cFP-077 described in
Example 12 (from cloning to purification), except as described
below.
[0594] The anti-FAP-PE variant chimeric molecules (b) and (c)
included a modified variable light chain domain (VL) in which the
methionine at position 4 of the original VL sequence of SEQ ID NO:
94 was substituted with leucine to provide a modified VL sequence
of SEQ ID NO: 290 ("LCL4"). The modified variable light chain
domain SEQ ID NO: 290 was found to reduce the production of
impurities related to N-terminal modifications. These N-terminal
modifications provided a mixture of variants with different light
chain lengths due to the initiation of expression of the unmodified
sequence at either the N-terminal methionine or the methionine at
position 4 of of SEQ ID NO: 94.
Pre-Cultivation:
[0595] For pre-fermentation, the same chemically defined medium
(CD-PCMv2.20) was used as described in Example 12.
[0596] The cultivation was performed on a rotary shaker for 8 hours
at 37.degree. C. and 170 rpm until an optical density (578 nm) of
13.3 or 14.4 was obtained. 150 ml of the pre-cultivation was used
to inoculate the batch medium of the 10 L bioreactor.
Fermentation:
[0597] For fermentation in a 101 Biostat C, DCU3 fermenter
(Sartorius, Melsungen, Germany), the same chemically-defined batch
medium as described in Example 12 was used.
[0598] One feed solution that was used contained 700 g/l
glucose*H.sub.2O, 7.4 g/l MgSO.sub.4*7 H.sub.2O and 0.1 g/l
FeSO.sub.4*7E120. All components were dissolved in deionized water.
The alkaline solution for pH regulation was an aqueous 12.5% (w/v)
NH.sub.3 solution supplemented with 11.25 g/l L-methionine and 10
g/L Leucine and 10 g/L Threonine.
[0599] Starting with 6.24 L sterile batch medium plus 150 mL
inoculum from the pre-cultivation, the batch fermentation was
performed at 32.degree. C., pH 6.9.+-.0.2, 800 mbar back pressure
and an initial aeration rate of 101/min. The relative value of
dissolved oxygen (pO.sub.2) was kept at 50% throughout the
fermentation by increasing the stirrer speed up to 1500 rpm. After
the initially supplemented glucose was depleted, indicated by a
steep increase in dissolved oxygen values, the temperature was
shifted to 32.degree. C. or 37.degree. C., and 15 minutes later,
the fermentation entered the fed-batch mode with the start of both
the feeds (60 and 14 g/h respectively). The rate of the feed was
increased stepwise with a predefined feeding profile from 90 to
finally 210 or 240 g/h within 5.5 or 6.5 hours. When carbon dioxide
off gas concentration leveled above 2%, the aeration rate was
constantly increased from 10 to 20 l/min within 5 hours. The
expression of recombinant protein was induced by the addition of
3.6 g IPTG at an optical density of approx. 40 or 120. The target
protein was expressed as inclusion bodies within the cytoplasm.
[0600] After 24 hours of cultivation, an optical density of 179 or
171 was achieved, and the whole broth was cooled down to
4-8.degree. C. The bacteria were harvested via centrifugation with
lab centrifuge (4500 rpm, cooling at 4.degree. C., for 1 h) and the
obtained biomass was stored at -20.degree. C. until further
processing (cell disruption).
Analysis of Product Formation:
[0601] The specific differences in comparison to the method of
Example 12 are described below:
[0602] The same amount of cells (OD.sub.Target=10) from every
sample were suspended in 5 mL PBS buffer and disrupted via
sonication on ice. Then 100 .mu.l of each suspension were
centrifuged (8,000 rpm, 5 minutes) and each supernatant was
withdrawn and transferred to a separate vial.
[0603] After adding Laemmli buffer, the samples were heated for 45
minutes 40.degree. C. under intense mixing to solubilize and reduce
all proteins in the samples.
Inclusion Body Preparation:
[0604] The inclusion body preparations (IBP) of the 10 L
fermentations were processed in a manner analogous to the method
described in Example 12, with the exception that after disruption
of the bacteria cells, further benzoase (30 U/gDCW) was added and
incubated for 60 minutes at 25.degree. C.
[0605] Solubilization, renaturation and purification were performed
in a manner similar to that described in Example 12. The following
sequences were used: [0606] Sequence of
iFAP-PE24-LR-LO10R-456A-long-linker and
LCL4-PE24-LR-LO10R-456A-long-linker chimeric full length heavy
chain comprising the variable domain VH of SEQ ID NO: 93, a linker
comprising the amino acid sequence of SEQ ID NO: 36, and a PE
comprising SEQ ID NO: 37 (SEQ ID NO: 291); [0607] Sequence LCL4-T20
chimeric heavy chain construct comprising the full length heavy
chain comprising the variable domain VH of SEQ ID NO: 93, a linker
comprising the amino acid sequence of SEQ ID NO: 36 and a PE
comprising SEQ ID NO: 289 (T18/T20) (SEQ ID NO: 292); [0608]
Sequence of full length iFAP light chain (SEQ ID NO: 293)
comprising the variable light chain domain of SEQ ID NO: 94 and
constant region; [0609] Sequence of full length LCL4 light chain
(SEQ ID NO: 294) comprising the variable light chain domain of SEQ
ID NO: 290 and constant region; and [0610] Sequence of the variable
light chain domain of SEQ ID NO: 290 (with mutation M4 L at
position 4 (compared to SEQ ID NO: 94).
Example 26
[0611] This example demonstrates the cytotoxicity of the
anti-FAP-PE variant chimeric molecules
iFAP-PE24-LR-LO10R-456A-long-linker,
LCL4-PE24-LR-LO10R-456A-long-linker, and LCL4-T20.
[0612] The cytotoxicity of iFAP-PE24-LR-LO10R-456A-long-linker was
compared to that of LCL4-PE24-LR-LO10R-456A-long-linker and
LCL4-T20 ("cFPs") with respect to the FAP-positive fibroblast cell
line MRC-5, the FAP-positive desmoplastic melanoma cell line
LOX-IMVI, and the FAP-positive sarcoma cell line OsA-CL. Briefly,
cells were seeded at a density of 10,000 cells/well on 96-well
plates. After overnight culture, different concentrations of the
cFPs were added to the medium, and the cells were incubated for 72
hours. At the end of incubation period, cell viability was
determined using a CELLTITER GLO assay. The results are shown in
Table 28 and Table 29.
[0613] As shown in Table 28, comparable IC50 values for the
inhibition of cell viability were observed on all 3 tested cell
lines for iFAP-PE24-LR-LO10R-456A-long-linker (3 different batches)
and for LCL4-PE24-LR-LO10R-456A-long-linker. As shown in Table 29,
LCL4-T20 also showed potent inhibition of cell viability. In
summary, iFAP-PE24-LR-LO10R-456A-long-linker,
LCL4-PE24-LR-LO10R-456A-long-linker, and LCL4-T20 showed potent
cytotoxic effects on FAP-positive tumor cell lines and
fibroblasts.
TABLE-US-00032 TABLE 28 IC50 in CELLTITER GLO assay with cell lines
expressing FAP(ng/ml) MRC-5 MRC-5 LOX- OsA- Fusion protein
(experiment 1) (experiment 2) IMVI CL iFAP- PE24- 14.3 8.5 6.6 98.3
LR-LO10R- 456A-long- linker (Batch 1) iFAP- PE24- 14.4 9.3 9.1 46.3
LR-LO10R- 456A-long- linker (Batch 2) iFAP- PE24- 10.0 5.5 5.7 55.3
LR-LO10R- 456A-long- linker (Batch 3) LCL4- PE24- 13.9 9.8 9.7
103.1 LR-LO10R- 456A-long- linker
TABLE-US-00033 TABLE 29 IC50 in CELLTITER GLO assay with cell lines
expressing FAP(nM) Fusion protein MRC-5 LOX-IMVI OsA-CL LCL4-
PE24-LR-LO10R- 0.15 nM 0.33 nM 0.23 nM 456A-long-linker LCL4-T20
0.98 nM 8.99 nM 0.50 nM
Example 27
[0614] This example demonstrates the production of anti-CAIX-PE
variant chimeric molecules.
[0615] Two anti-CAIX-PE variant chimeric molecules comprising:
[0616] (a) a linker comprising the amino acid sequence of SEQ ID
NO: 36, a PE comprising SEQ ID NO: 37 (L010R-456A), the variable
heavy chain domain VH of SEQ ID NO: 125, and the variable light
chain domain of SEQ ID NO: 126; or [0617] (b) a linker comprising
the amino acid sequence of SEQ ID NO: 36, a PE comprising SEQ ID
NO: 289 (T-20), the variable heavy chain domain VH of SEQ ID NO:
125, and the variable light chain domain of SEQ ID NO: 126; [0618]
were prepared by a method analogous to that described for the
anti-mesothelin PE variant chimeric molecule cFP-077 of Example 12
(from cloning to purification), except as described below.
[0619] Samples were analyzed by OD 280 nm using a UV
spectrophotometer to determine the protein concentration in
solution. The materials for the SDS-PAGE and Coomassie Staining
Device are set forth in Table 30 below.
TABLE-US-00034 TABLE 30 Invitrogen XCell Sure Lock Mini-Cell Gel:
4-12% Bis-Tris Gel, Invitrogen NP0321 Buffer: MES SDS Running
Buffer (10x), Invitrogen NP0002 Sample buffer: Tris-Glycine SDS
Sample Buffer (2x), Invitrogen LC2676 Reducing buffer: NUPAGE
Sample Reducing Agent (10x), Invitrogen NP0004 Molecular Precision
Plus KALEIDOSCOPE Weight Marker: Standard 161-0375
[0620] After adding Laemmli buffer, the samples were heated for 45
minutes at 40.degree. C. under intense mixing to solubilize and
reduce all proteins in the samples.
[0621] The sample was adjusted to a protein concentration of 1
mg/ml with buffer. Sample reduction used a reduction buffer
comprising 4 ml of sample buffer (2.times.) and 1 ml of reducing
buffer (10.times.). The samples were reduced by diluting the sample
1:1 with reduction buffer and incubating the sample for 10 minutes
at 70.degree. C.
[0622] The gel electrophoresis was carried out at 200 V for 40
minutes. The gels were stained with SIMPLY BLUE Safe Stain
(Invitrogen, Cat. No. LC6065).
Inclusion Body Preparation:
[0623] The inclusion body preparations (IBP) of the 10 L
fermentations were processed in a manner analogous to that
described in Example 12, with the exception that after disruption
of the bacteria cells, further benzoase (30 U/gDCW) was added and
incubated for 60 minutes at 25.degree. C.
[0624] Solubilization, renaturation and purification were performed
in a manner similar to that described in Example 12.
[0625] The following sequences were used: [0626] Sequence of
CAIX-PE24-LR-LO10R-456A-long-linker chimeric heavy chain construct
(SEQ ID NO: 295): comprising the variable heavy chain domain VH of
SEQ ID NO: 125, a linker comprising the amino acid sequence of SEQ
ID NO: 36, and a PE comprising SEQ ID NO: 37; [0627] Sequence of
CAIX-T20 chimeric heavy chain construct (SEQ ID NO: 296) comprising
the variable heavy chain domain VH of SEQ ID NO: 125, a linker
comprising the amino acid sequence of SEQ ID NO: 36 and a PE
comprising SEQ ID NO: 289 (T18/T20); and [0628] Sequence of full
length light chain (SEQ ID NO: 297) comprising the variable light
chain domain of SEQ ID NO: 126) and constant region.
Example 28
[0629] This example demonstrates the cytotoxicity (in vitro tumor
cell killing) of the anti-CAIX-PE variant chimeric molecules
CAIX-PE24-LR-LO10R-456A-long-linker and CAIX-T20.
[0630] The cytotoxicity of CAIX-PE24-LR-LO10R-456A-long-linker and
CAIX-T20 ("cFPs") was compared in cell viability assays using
CAIX-expressing RCC-MF cells. Briefly, cells were seeded at a
density of 7,500 cells/well on 96 well plates. After overnight
culture, different concentrations of the cFPs were added to the
medium, and the cells were incubated for 72 hours. At the end of
incubation period, cell viability was determined using a CELLTITER
GLO assay. The results are shown in Table 31.
[0631] In summary, CAIX-PE24-LR-LO10R-456A-long-linker and CAIX-T20
showed potent cytotoxic effects on CAIX-positive tumor cell
lines.
TABLE-US-00035 TABLE 31 IC50 in CELLTITER GLO assay with cell lines
expressing CAIX (nM) Fusion protein RCC-MF cells
CAIX-PE24-LR-LO10R- 0.02 nM 456A-long-linker CAIX-T20 0.048 nM
[0632] All references, including publications, patent applications,
and patents, cited herein are hereby incorporated by reference to
the same extent as if each reference were individually and
specifically indicated to be incorporated by reference and were set
forth in its entirety herein.
[0633] The use of the terms "a" and "an" and "the" and "at least
one" and similar referents in the context of describing the
invention (especially in the context of the following claims) are
to be construed to cover both the singular and the plural, unless
otherwise indicated herein or clearly contradicted by context. The
use of the term "at least one" followed by a list of one or more
items (for example, "at least one of A and B") is to be construed
to mean one item selected from the listed items (A or B) or any
combination of two or more of the listed items (A and B), unless
otherwise indicated herein or clearly contradicted by context. The
terms "comprising," "having," "including," and "containing" are to
be construed as open-ended terms (i.e., meaning "including, but not
limited to,") unless otherwise noted. Recitation of ranges of
values herein are merely intended to serve as a shorthand method of
referring individually to each separate value falling within the
range, unless otherwise indicated herein, and each separate value
is incorporated into the specification as if it were individually
recited herein. All methods described herein can be performed in
any suitable order unless otherwise indicated herein or otherwise
clearly contradicted by context. The use of any and all examples,
or exemplary language (e.g., "such as") provided herein, is
intended merely to better illuminate the invention and does not
pose a limitation on the scope of the invention unless otherwise
claimed. No language in the specification should be construed as
indicating any non-claimed element as essential to the practice of
the invention.
[0634] Preferred embodiments of this invention are described
herein, including the best mode known to the inventors for carrying
out the invention. Variations of those preferred embodiments may
become apparent to those of ordinary skill in the art upon reading
the foregoing description. The inventors expect skilled artisans to
employ such variations as appropriate, and the inventors intend for
the invention to be practiced otherwise than as specifically
described herein. Accordingly, this invention includes all
modifications and equivalents of the subject matter recited in the
claims appended hereto as permitted by applicable law. Moreover,
any combination of the above-described elements in all possible
variations thereof is encompassed by the invention unless otherwise
indicated herein or otherwise clearly contradicted by context.
Sequence CWU 1
1
2971613PRTPseudomonas aeruginosa 1Ala Glu Glu Ala Phe Asp Leu Trp
Asn Glu Cys Ala Lys Ala Cys Val1 5 10 15Leu Asp Leu Lys Asp Gly Val
Arg Ser Ser Arg Met Ser Val Asp Pro 20 25 30Ala Ile Ala Asp Thr Asn
Gly Gln Gly Val Leu His Tyr Ser Met Val 35 40 45Leu Glu Gly Gly Asn
Asp Ala Leu Lys Leu Ala Ile Asp Asn Ala Leu 50 55 60Ser Ile Thr Ser
Asp Gly Leu Thr Ile Arg Leu Glu Gly Gly Val Glu65 70 75 80Pro Asn
Lys Pro Val Arg Tyr Ser Tyr Thr Arg Gln Ala Arg Gly Ser 85 90 95Trp
Ser Leu Asn Trp Leu Val Pro Ile Gly His Glu Lys Pro Ser Asn 100 105
110Ile Lys Val Phe Ile His Glu Leu Asn Ala Gly Asn Gln Leu Ser His
115 120 125Met Ser Pro Ile Tyr Thr Ile Glu Met Gly Asp Glu Leu Leu
Ala Lys 130 135 140Leu Ala Arg Asp Ala Thr Phe Phe Val Arg Ala His
Glu Ser Asn Glu145 150 155 160Met Gln Pro Thr Leu Ala Ile Ser His
Ala Gly Val Ser Val Val Met 165 170 175Ala Gln Thr Gln Pro Arg Arg
Glu Lys Arg Trp Ser Glu Trp Ala Ser 180 185 190Gly Lys Val Leu Cys
Leu Leu Asp Pro Leu Asp Gly Val Tyr Asn Tyr 195 200 205Leu Ala Gln
Gln Arg Cys Asn Leu Asp Asp Thr Trp Glu Gly Lys Ile 210 215 220Tyr
Arg Val Leu Ala Gly Asn Pro Ala Lys His Asp Leu Asp Ile Lys225 230
235 240Pro Thr Val Ile Ser His Arg Leu His Phe Pro Glu Gly Gly Ser
Leu 245 250 255Ala Ala Leu Thr Ala His Gln Ala Cys His Leu Pro Leu
Glu Thr Phe 260 265 270Thr Arg His Arg Gln Pro Arg Gly Trp Glu Gln
Leu Glu Gln Cys Gly 275 280 285Tyr Pro Val Gln Arg Leu Val Ala Leu
Tyr Leu Ala Ala Arg Leu Ser 290 295 300Trp Asn Gln Val Asp Gln Val
Ile Arg Asn Ala Leu Ala Ser Pro Gly305 310 315 320Ser Gly Gly Asp
Leu Gly Glu Ala Ile Arg Glu Gln Pro Glu Gln Ala 325 330 335Arg Leu
Ala Leu Thr Leu Ala Ala Ala Glu Ser Glu Arg Phe Val Arg 340 345
350Gln Gly Thr Gly Asn Asp Glu Ala Gly Ala Ala Asn Ala Asp Val Val
355 360 365Ser Leu Thr Cys Pro Val Ala Ala Gly Glu Cys Ala Gly Pro
Ala Asp 370 375 380Ser Gly Asp Ala Leu Leu Glu Arg Asn Tyr Pro Thr
Gly Ala Glu Phe385 390 395 400Leu Gly Asp Gly Gly Asp Val Ser Phe
Ser Thr Arg Gly Thr Gln Asn 405 410 415Trp Thr Val Glu Arg Leu Leu
Gln Ala His Arg Gln Leu Glu Glu Arg 420 425 430Gly Tyr Val Phe Val
Gly Tyr His Gly Thr Phe Leu Glu Ala Ala Gln 435 440 445Ser Ile Val
Phe Gly Gly Val Arg Ala Arg Ser Gln Asp Leu Asp Ala 450 455 460Ile
Trp Arg Gly Phe Tyr Ile Ala Gly Asp Pro Ala Leu Ala Tyr Gly465 470
475 480Tyr Ala Gln Asp Gln Glu Pro Asp Ala Arg Gly Arg Ile Arg Asn
Gly 485 490 495Ala Leu Leu Arg Val Tyr Val Pro Arg Ser Ser Leu Pro
Gly Phe Tyr 500 505 510Arg Thr Ser Leu Thr Leu Ala Ala Pro Glu Ala
Ala Gly Glu Val Glu 515 520 525Arg Leu Ile Gly His Pro Leu Pro Leu
Arg Leu Asp Ala Ile Thr Gly 530 535 540Pro Glu Glu Glu Gly Gly Arg
Leu Glu Thr Ile Leu Gly Trp Pro Leu545 550 555 560Ala Glu Arg Thr
Val Val Ile Pro Ser Ala Ile Pro Thr Asp Pro Arg 565 570 575Asn Val
Gly Gly Asp Leu Asp Pro Ser Ser Ile Pro Asp Lys Glu Gln 580 585
590Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser Gln Pro Gly Lys Pro Pro
595 600 605Arg Glu Asp Leu Lys 610212PRTArtificial
SequenceSyntheticMISC_FEATURE(1)..(1)Xaa at position 1 is Leu or
AlaMISC_FEATURE(4)..(4)Xaa at position 4 is Leu or
AlaMISC_FEATURE(5)..(5)Xaa at position 5 is Tyr or
AlaMISC_FEATURE(6)..(6)Xaa at position 6 is Leu or
AlaMISC_FEATURE(9)..(9)Xaa at position 9 is Arg or Ala 2Xaa Val Ala
Xaa Xaa Xaa Ala Ala Xaa Leu Ser Trp1 5 10312PRTPseudomonas
aeruginosa 3Leu Val Ala Leu Tyr Leu Ala Ala Arg Leu Ser Trp1 5
1044PRTArtificial SequenceSyntheticMISC_FEATURE(2)..(2)Xaa at
position 2 is any amino acidMISC_FEATURE(3)..(3)Xaa at position 3
is Arg or Lys 4Arg Xaa Xaa Arg154PRTArtificial SequenceSynthetic
5Lys Asp Glu Leu165PRTPseudomonas aeruginosa 6Arg Glu Asp Leu Lys1
574PRTPseudomonas aeruginosa 7Arg Glu Asp Leu1811PRTPseudomonas
aeruginosa 8Arg His Arg Gln Pro Arg Gly Trp Glu Gln Leu1 5
1094PRTArtificial SequenceSyntheticmisc_feature(2)..(3)Xaa can be
any naturally occurring amino acid 9Arg Xaa Xaa
Arg1104PRTArtificial SequenceSynthetic 10Arg Lys Lys
Arg1114PRTArtificial SequenceSynthetic 11Arg Arg Arg
Arg1124PRTArtificial SequenceSynthetic 12Arg Lys Ala
Arg1136PRTArtificial SequenceSynthetic 13Ser Arg Val Ala Arg Ser1
5149PRTArtificial SequenceSynthetic 14Thr Ser Ser Arg Lys Arg Arg
Phe Trp1 5159PRTArtificial SequenceSynthetic 15Ala Ser Arg Arg Lys
Ala Arg Ser Trp1 5168PRTArtificial SequenceSynthetic 16Arg Arg Val
Lys Lys Arg Phe Trp1 5178PRTArtificial SequenceSynthetic 17Arg Asn
Val Val Arg Arg Asp Trp1 5189PRTArtificial SequenceSynthetic 18Thr
Arg Ala Val Arg Arg Arg Ser Trp1 5194PRTArtificial
SequenceSynthetic 19Arg Gln Pro Arg1208PRTArtificial
SequenceSynthetic 20Arg His Arg Gln Pro Arg Gly Trp1
5219PRTArtificial SequenceSynthetic 21Arg His Arg Gln Pro Arg Gly
Trp Glu1 5229PRTArtificial SequenceSynthetic 22His Arg Gln Pro Arg
Gly Trp Glu Gln1 5237PRTArtificial SequenceSynthetic 23Arg Gln Pro
Arg Gly Trp Glu1 52411PRTArtificial SequenceSynthetic 24Arg His Arg
Ser Lys Arg Gly Trp Glu Gln Leu1 5 10254PRTArtificial
SequenceSynthetic 25Arg Ser Lys Arg1268PRTArtificial
SequenceSynthetic 26Arg His Arg Ser Lys Arg Gly Trp1
5278PRTArtificial SequenceSynthetic 27His Arg Ser Lys Arg Gly Trp
Glu1 5289PRTArtificial SequenceSynthetic 28Arg Ser Lys Arg Gly Trp
Glu Gln Leu1 52910PRTArtificial SequenceSynthetic 29His Arg Ser Lys
Arg Gly Trp Glu Gln Leu1 5 10306PRTArtificial SequenceSynthetic
30Arg His Arg Ser Lys Arg1 531106PRTArtificial SequenceSynthetic
31Asp Ile Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1
5 10 15Asp Arg Val Thr Ile Thr Cys Ser Ala Ser Ser Ser Val Ser Tyr
Met 20 25 30His Trp Tyr Gln Gln Lys Ser Gly Lys Ala Pro Lys Leu Leu
Ile Tyr 35 40 45Asp Thr Ser Lys Leu Ala Ser Gly Val Pro Ser Arg Phe
Ser Gly Ser 50 55 60Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser
Leu Gln Pro Glu65 70 75 80Asp Phe Ala Thr Tyr Tyr Cys Gln Gln Trp
Ser Lys His Pro Leu Thr 85 90 95Phe Gly Gln Gly Thr Lys Leu Glu Ile
Lys 100 10532107PRTArtificial SequenceSynthetic 32Arg Thr Val Ala
Ala Pro Ser Val Phe Ile Phe Pro Pro Ser Asp Glu1 5 10 15Gln Leu Lys
Ser Gly Thr Ala Ser Val Val Cys Leu Leu Asn Asn Phe 20 25 30Tyr Pro
Arg Glu Ala Lys Val Gln Trp Lys Val Asp Asn Ala Leu Gln 35 40 45Ser
Gly Asn Ser Gln Glu Ser Val Thr Glu Gln Asp Ser Lys Asp Ser 50 55
60Thr Tyr Ser Leu Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu65
70 75 80Lys His Lys Val Tyr Ala Cys Glu Val Thr His Gln Gly Leu Ser
Ser 85 90 95Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 100
10533214PRTArtificial SequenceSynthetic 33Met Asp Ile Gln Met Thr
Gln Ser Pro Ser Ser Leu Ser Ala Ser Val1 5 10 15Gly Asp Arg Val Thr
Ile Thr Cys Ser Ala Ser Ser Ser Val Ser Tyr 20 25 30Met His Trp Tyr
Gln Gln Lys Ser Gly Lys Ala Pro Lys Leu Leu Ile 35 40 45Tyr Asp Thr
Ser Lys Leu Ala 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 Trp Ser Lys His Pro Leu
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 21034119PRTArtificial SequenceSynthetic
34Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly Ala1
5 10 15Ser Val Lys Val Ser Cys Lys Ala Ser Gly Tyr Ser Phe Thr Gly
Tyr 20 25 30Thr Met Asn Trp Val Arg Gln Ala Pro Gly Gln Gly Leu Glu
Trp Met 35 40 45Gly Leu Ile Thr Pro Tyr Asn Gly Ala Ser Ser Tyr Asn
Gln Lys Phe 50 55 60Arg Gly Lys Ala Thr Met Thr Val Asp Thr Ser Thr
Ser Thr Val Tyr65 70 75 80Met Glu Leu Ser Ser Leu Arg Ser Glu Asp
Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Tyr Asp Gly Arg Gly
Phe Asp Tyr Trp Gly Gln Gly 100 105 110Thr Leu Val Thr Val Ser Ser
11535103PRTArtificial SequenceSynthetic 35Ala 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 1003626PRTArtificial
SequenceSynthetic 36Asp Lys Thr His Lys Ala Ser Gly Gly Arg His Arg
Gln Pro Arg Gly1 5 10 15Trp Glu Gln Leu Gly Gly Gly Gly Gly Ser 20
2537219PRTArtificial SequenceSynthetic 37Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly Asp Val Ser Phe Ser1 5 10 15Thr Arg Gly Thr Gln
Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His 20 25 30Ala Gln Leu Glu
Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr 35 40 45Phe Leu Glu
Ala Ala Gln Ser Ile Val Phe Gly Gly Val Ala Ala Arg 50 55 60Ser Gln
Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala Gly Asp65 70 75
80Pro Ala Leu Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Ala
85 90 95Gly Arg Ile Arg Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Ala
Ser 100 105 110Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu Thr Leu Ala
Ala Pro Glu 115 120 125Ala Ala Gly Glu Val Glu Arg Leu Ile Gly His
Pro Leu Pro Leu Ala 130 135 140Leu Asp Ala Ile Thr Gly Pro Glu Glu
Glu Gly Gly Arg Leu Glu Thr145 150 155 160Ile Leu Gly Trp Pro Leu
Ala Glu Arg Thr Val Val Ile Pro Ser Ala 165 170 175Ile Pro Thr Asp
Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser 180 185 190Ile Pro
Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser 195 200
205Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 210
21538223PRTArtificial SequenceSynthetic 38Met Gln Val Gln Leu Val
Gln Ser Gly Ala Glu Val Lys Lys Pro Gly1 5 10 15Ala Ser Val Lys Val
Ser Cys Lys Ala Ser Gly Tyr Ser Phe Thr Gly 20 25 30Tyr Thr Met Asn
Trp Val Arg Gln Ala Pro Gly Gln Gly Leu Glu Trp 35 40 45Met Gly Leu
Ile Thr Pro Tyr Asn Gly Ala Ser Ser Tyr Asn Gln Lys 50 55 60Phe Arg
Gly Lys Ala Thr Met Thr Val Asp Thr Ser Thr Ser Thr Val65 70 75
80Tyr Met Glu Leu Ser Ser Leu Arg Ser Glu Asp Thr Ala Val Tyr Tyr
85 90 95Cys Ala Arg Gly Gly Tyr Asp Gly Arg Gly Phe 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 210
215 22039214PRTArtificial SequenceSynthetic 39Met Asp Ile Gln Met
Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val1 5 10 15Gly Asp Arg Val
Thr Ile Thr Cys Ser Ala Ser Ser Ser Val Ser Tyr 20 25 30Met His Trp
Tyr Gln Gln Lys Ser Gly Lys Ala Pro Lys Leu Leu Ile 35 40 45Tyr Asp
Thr Ser Lys Leu Ala 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 Trp Ser Lys His Pro Leu
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 21040468PRTArtificial SequenceSynthetic
40Met Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly1
5 10 15Ala Ser Val Lys Val Ser Cys Lys Ala Ser Gly Tyr Ser Phe Thr
Gly 20 25 30Tyr Thr Met Asn Trp Val Arg Gln Ala Pro Gly Gln Gly Leu
Glu Trp 35 40 45Met Gly Leu Ile Thr Pro Tyr Asn Gly Ala Ser Ser Tyr
Asn Gln Lys 50 55 60Phe Arg Gly Lys Ala Thr Met Thr Val Asp Thr Ser
Thr Ser Thr Val65 70 75 80Tyr Met Glu Leu Ser Ser Leu Arg Ser Glu
Asp Thr Ala
Val Tyr Tyr 85 90 95Cys Ala Arg Gly Gly Tyr Asp Gly Arg Gly Phe 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 Lys Ala Ser Gly Gly Arg His Arg Gln
Pro Arg Gly Trp225 230 235 240Glu Gln Leu Gly Gly Gly Gly Gly Ser
Pro Thr Gly Ala Glu Phe Leu 245 250 255Gly Asp Gly Gly Asp Val Ser
Phe Ser Thr Arg Gly Thr Gln Asn Trp 260 265 270Thr Val Glu Arg Leu
Leu Gln Ala His Ala Gln Leu Glu Glu Arg Gly 275 280 285Tyr Val Phe
Val Gly Tyr His Gly Thr Phe Leu Glu Ala Ala Gln Ser 290 295 300Ile
Val Phe Gly Gly Val Ala Ala Arg Ser Gln Asp Leu Ala Ala Ile305 310
315 320Trp Ala Gly Phe Tyr Ile Ala Gly Asp Pro Ala Leu Ala Tyr Gly
Tyr 325 330 335Ala Gln Asp Gln Glu Pro Asp Ala Ala Gly Arg Ile Arg
Asn Gly Ala 340 345 350Leu Leu Arg Val Tyr Val Pro Ala Ser Ser Leu
Pro Gly Phe Tyr Arg 355 360 365Thr Ser Leu Thr Leu Ala Ala Pro Glu
Ala Ala Gly Glu Val Glu Arg 370 375 380Leu Ile Gly His Pro Leu Pro
Leu Ala Leu Asp Ala Ile Thr Gly Pro385 390 395 400Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro Leu Ala 405 410 415Glu Arg
Thr Val Val Ile Pro Ser Ala Ile Pro Thr Asp Pro Arg Asn 420 425
430Val Gly Gly Asp Leu Asp Pro Ser Ser Ile Pro Asp Lys Glu Gln Ala
435 440 445Ile Ser Ala Leu Pro Asp Tyr Ala Ser Gln Pro Gly Lys Pro
Pro Arg 450 455 460Glu Asp Leu Lys46541214PRTArtificial
SequenceSynthetic 41Met Asp Ile Glu Leu Thr Gln Ser Pro Ala Ile Met
Ser Ala Ser Pro1 5 10 15Gly Glu Lys Val Thr Met Thr Cys Ser Ala Ser
Ser Ser Val Ser Tyr 20 25 30Met His Trp Tyr Gln Gln Lys Ser Gly Thr
Ser Pro Lys Arg Trp Ile 35 40 45Tyr Asp Thr Ser Lys Leu Ala Ser Gly
Val Pro Gly Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly Asn Ser Tyr Ser
Leu Thr Ile Ser Ser Val Glu Ala65 70 75 80Glu Asp Asp Ala Thr Tyr
Tyr Cys Gln Gln Trp Ser Lys His Pro Leu 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
21042461PRTArtificial SequenceSynthetic 42Met Gln Val Gln Leu Gln
Gln Ser Gly Pro Glu Leu Glu Lys Pro Gly1 5 10 15Ala Ser Val Lys Ile
Ser Cys Lys Ala Ser Gly Tyr Ser Phe Thr Gly 20 25 30Tyr Thr Met Asn
Trp Val Lys Gln Ser His Gly Lys Gly Leu Glu Trp 35 40 45Ile Gly Leu
Ile Thr Pro Tyr Asn Gly Ala Ser Ser Tyr Asn Gln Lys 50 55 60Phe Arg
Gly Lys Ala Thr Leu Thr Val Asp Lys Ser Ser Ser Thr Ala65 70 75
80Tyr Met Asp Leu Leu Ser Leu Thr Ser Glu Asp Ser Ala Val Tyr Phe
85 90 95Cys Ala Arg Gly Gly Tyr Asp Gly Arg Gly Phe Asp Tyr Trp Gly
Gln 100 105 110Gly Thr Thr 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 Lys
210 215 220Ala Ser Gly Gly Arg His Arg Gln Pro Arg Gly Trp Glu Gln
Leu Gly225 230 235 240Gly Ser Pro Thr Gly Ala Glu Phe Leu Gly Asp
Gly Gly Asp Val Ser 245 250 255Phe Ser Thr Arg Gly Thr Gln Asn Trp
Thr Val Glu Arg Leu Leu Gln 260 265 270Ala His Ala Gln Leu Glu Glu
Arg Gly Tyr Val Phe Val Gly Tyr His 275 280 285Gly Thr Phe Leu Glu
Ala Ala Gln Ser Ile Val Phe Gly Gly Val Arg 290 295 300Ala Ala Ser
Gln Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala305 310 315
320Gly Asp Pro Ala Leu Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp
325 330 335Ala Ala Gly Arg Ile Arg Asn Gly Ala Leu Leu Arg Val Tyr
Val Pro 340 345 350Ala Ser Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu
Thr Leu Ala Ala 355 360 365Pro Glu Ala Ala Gly Glu Val Glu Arg Leu
Ile Gly His Pro Leu Pro 370 375 380Leu Ala Leu Asp Ala Ile Thr Gly
Pro Glu Glu Glu Gly Gly Arg Leu385 390 395 400Glu Thr Ile Leu Gly
Trp Pro Leu Ala Glu Arg Thr Val Val Ile Pro 405 410 415Ser Ala Ile
Pro Thr Asp Pro Arg Asn Val Gly Gly Asp Leu Asp Pro 420 425 430Ser
Ser Ile Pro Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr 435 440
445Ala Ser Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 450 455
46043107PRTArtificial SequenceSynthetic 43Met Asp Ile Glu Leu Thr
Gln Ser Pro Ala Ile Met Ser Ala Ser Pro1 5 10 15Gly Glu Lys Val Thr
Met Thr Cys Ser Ala Ser Ser Ser Val Ser Tyr 20 25 30Met His Trp Tyr
Gln Gln Lys Ser Gly Thr Ser Pro Lys Arg Trp Ile 35 40 45Tyr Asp Thr
Ser Lys Leu Ala Ser Gly Val Pro Gly Arg Phe Ser Gly 50 55 60Ser Gly
Ser Gly Asn Ser Tyr Ser Leu Thr Ile Ser Ser Val Glu Ala65 70 75
80Glu Asp Asp Ala Thr Tyr Tyr Cys Gln Gln Trp Ser Lys His Pro Leu
85 90 95Thr Phe Gly Cys Gly Thr Lys Leu Glu Ile Lys 100
10544358PRTArtificial SequenceSynthetic 44Met Gln Val Gln Leu Gln
Gln Ser Gly Pro Glu Leu Glu Lys Pro Gly1 5 10 15Ala Ser Val Lys Ile
Ser Cys Lys Ala Ser Gly Tyr Ser Phe Thr Gly 20 25 30Tyr Thr Met Asn
Trp Val Lys Gln Ser His Gly Lys Cys Leu Glu Trp 35 40 45Ile Gly Leu
Ile Thr Pro Tyr Asn Gly Ala Ser Ser Tyr Asn Gln Lys 50 55 60Phe Arg
Gly Lys Ala Thr Leu Thr Val Asp Lys Ser Ser Ser Thr Ala65 70 75
80Tyr Met Asp Leu Leu Ser Leu Thr Ser Glu Asp Ser Ala Val Tyr Phe
85 90 95Cys Ala Arg Gly Gly Tyr Asp Gly Arg Gly Phe Asp Tyr Trp Gly
Gln 100 105 110Gly Thr Thr Val Thr Val Ser Ser Lys Ala Ser Gly Gly
Arg His Arg 115 120 125Gln Pro Arg Gly Trp Glu Gln Leu Gly Gly Ser
Pro Thr Gly Ala Glu 130 135 140Phe Leu Gly Asp Gly Gly Asp Val Ser
Phe Ser Thr Arg Gly Thr Gln145 150 155 160Asn Trp Thr Val Glu Arg
Leu Leu Gln Ala His Ala Gln Leu Glu Glu 165 170 175Arg Gly Tyr Val
Phe Val Gly Tyr His Gly Thr Phe Leu Glu Ala Ala 180 185 190Gln Ser
Ile Val Phe Gly Gly Val Arg Ala Ala Ser Gln Asp Leu Ala 195 200
205Ala Ile Trp Ala Gly Phe Tyr Ile Ala Gly Asp Pro Ala Leu Ala Tyr
210 215 220Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Ala Gly Arg Ile
Arg Asn225 230 235 240Gly Ala Leu Leu Arg Val Tyr Val Pro Ala Ser
Ser Leu Pro Gly Phe 245 250 255Tyr Arg Thr Ser Leu Thr Leu Ala Ala
Pro Glu Ala Ala Gly Glu Val 260 265 270Glu Arg Leu Ile Gly His Pro
Leu Pro Leu Ala Leu Asp Ala Ile Thr 275 280 285Gly Pro Glu Glu Glu
Gly Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro 290 295 300Leu Ala Glu
Arg Thr Val Val Ile Pro Ser Ala Ile Pro Thr Asp Pro305 310 315
320Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser Ile Pro Asp Lys Glu
325 330 335Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser Gln Pro Gly
Lys Pro 340 345 350Pro Arg Glu Asp Leu Lys 35545119PRTArtificial
SequenceSynthetic 45Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys
Lys Pro Gly Ala1 5 10 15Ser Val Lys Val Ser Cys Lys Ala Ser Gly Tyr
Ser Phe Thr Gly Tyr 20 25 30Thr Met Asn Trp Val Arg Gln Ala Pro Gly
Gln Gly Leu Glu Trp Met 35 40 45Gly Leu Ile Thr Pro Tyr Asn Gly Ala
Ser Ser Tyr Asn Gln Lys Phe 50 55 60Arg Gly Lys Ala Thr Met Thr Val
Asp Thr Ser Thr Ser Thr Val Tyr65 70 75 80Met Glu Leu Ser Ser Leu
Arg Ser Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly Tyr
Asp Gly Arg Gly Phe Asp Tyr Trp Gly Gln Gly 100 105 110Thr Leu Val
Thr Val Ser Ser 11546106PRTArtificial SequenceSynthetic 46Asp Ile
Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp
Arg Val Thr Ile Thr Cys Ser Ala Ser Ser Ser Val Ser Tyr Met 20 25
30His Trp Tyr Gln Gln Lys Ser Gly Lys Ala Pro Lys Leu Leu Ile Tyr
35 40 45Asp Thr Ser Lys Leu Ala Ser Gly Val Pro Ser Arg Phe Ser Gly
Ser 50 55 60Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser Leu Gln
Pro Glu65 70 75 80Asp Phe Ala Thr Tyr Tyr Cys Gln Gln Trp Ser Lys
His Pro Leu Thr 85 90 95Phe Gly Gln Gly Thr Lys Leu Glu Ile Lys 100
1054730PRTArtificial SequenceSynthetic 47Gln Val Gln Leu Val Gln
Ser Gly Ala Glu Val Lys Lys Pro Gly Ala1 5 10 15Ser Val Lys Val Ser
Cys Lys Ala Ser Gly Tyr Ser Phe Thr 20 25 304823PRTArtificial
SequenceSynthetic 48Asp Ile Gln Met Thr Gln Ser Pro Ser Ser Leu Ser
Ala Ser Val Gly1 5 10 15Asp Arg Val Thr Ile Thr Cys
20495PRTArtificial SequenceSynthetic 49Gly Tyr Thr Met Asn1
55010PRTArtificial SequenceSynthetic 50Ser Ala Ser Ser Ser Val Ser
Tyr Met His1 5 105114PRTArtificial SequenceSynthetic 51Trp Val Arg
Gln Ala Pro Gly Gln Gly Leu Glu Trp Met Gly1 5 105215PRTArtificial
SequenceSynthetic 52Trp Tyr Gln Gln Lys Ser Gly Lys Ala Pro Lys Leu
Leu Ile Tyr1 5 10 155317PRTArtificial SequenceSynthetic 53Leu Ile
Thr Pro Tyr Asn Gly Ala Ser Ser Tyr Asn Gln Lys Phe Arg1 5 10
15Gly547PRTArtificial SequenceSynthetic 54Asp Thr Ser Lys Leu Ala
Ser1 55532PRTArtificial SequenceSynthetic 55Lys Ala Thr Met Thr Val
Asp Thr Ser Thr Ser Thr Val Tyr Met Glu1 5 10 15Leu Ser Ser Leu Arg
Ser Glu Asp Thr Ala Val Tyr Tyr Cys Ala Arg 20 25
305632PRTArtificial SequenceSynthetic 56Gly Val Pro Ser Arg Phe Ser
Gly Ser Gly Ser Gly Thr Asp Phe Thr1 5 10 15Leu Thr Ile Ser Ser Leu
Gln Pro Glu Asp Phe Ala Thr Tyr Tyr Cys 20 25 305710PRTArtificial
SequenceSynthetic 57Gly Gly Tyr Asp Gly Arg Gly Phe Asp Tyr1 5
10589PRTArtificial SequenceSynthetic 58Gln Gln Trp Ser Lys His Pro
Leu Thr1 55911PRTArtificial SequenceSynthetic 59Trp Gly Gln Gly Thr
Leu Val Thr Val Ser Ser1 5 106010PRTArtificial SequenceSynthetic
60Phe Gly Gln Gly Thr Lys Leu Glu Ile Lys1 5 1061115PRTArtificial
SequenceSynthetic 61Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys
Lys Pro Gly Ala1 5 10 15Ser Val Lys Val Ser Cys Lys Ala Ser Gly Tyr
Thr Phe Thr Asp Tyr 20 25 30Glu Met His Trp Val Arg Gln Ala Pro Gly
Gln Gly Leu Glu Trp Met 35 40 45Gly Ala Leu Asp Pro Lys Thr Gly Asp
Thr Ala Tyr Ser Gln Lys Phe 50 55 60Lys Gly Arg Val Thr Leu Thr Ala
Asp Lys Ser Thr Ser Thr Ala Tyr65 70 75 80Met Glu Leu Ser Ser Leu
Thr Ser Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Thr Arg Phe Tyr Ser
Tyr Thr Tyr Trp Gly Gln Gly Thr Leu Val Thr 100 105 110Val Ser Ser
11562112PRTArtificial SequenceSynthetic 62Asp Val Val Met Thr Gln
Ser Pro Leu Ser Leu Pro Val Thr Pro Gly1 5 10 15Glu Pro Ala Ser Ile
Ser Cys Arg Ser Ser Gln Ser Leu Val His Ser 20 25 30Asn Arg Asn Thr
Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser 35 40 45Pro Gln Leu
Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro 50 55 60Asp Arg
Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile65 70 75
80Ser Arg Val Glu Ala Glu Asp Val Gly Val Tyr Tyr Cys Ser Gln Asn
85 90 95Thr His Val Pro Pro Thr Phe Gly Gln Gly Thr Lys Leu Glu Ile
Lys 100 105 1106330PRTArtificial SequenceSynthetic 63Gln Val Gln
Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly Ala1 5 10 15Ser Val
Lys Val Ser Cys Lys Ala Ser Gly Tyr Thr Phe Thr 20 25
306423PRTArtificial SequenceSynthetic 64Asp Val Val Met Thr Gln Ser
Pro Leu Ser Leu Pro Val Thr Pro Gly1 5 10 15Glu Pro Ala Ser Ile Ser
Cys 20655PRTArtificial SequenceSynthetic 65Asp Tyr Glu Met His1
56616PRTArtificial SequenceSynthetic 66Arg Ser Ser Gln Ser Leu Val
His Ser Asn Arg Asn Thr Tyr Leu His1 5 10 156714PRTArtificial
SequenceSynthetic 67Trp Val Arg Gln Ala Pro Gly Gln Gly Leu Glu Trp
Met Gly1 5 106815PRTArtificial SequenceSynthetic 68Trp Tyr Leu Gln
Lys Pro Gly Gln Ser Pro Gln Leu Leu Ile Tyr1 5 10
156917PRTArtificial SequenceSynthetic 69Ala Leu Asp Pro Lys Thr Gly
Asp Thr Ala Tyr Ser Gln Lys Phe Lys1 5 10 15Gly707PRTArtificial
SequenceSynthetic 70Lys Val Ser Asn
Arg Phe Ser1 57132PRTArtificial SequenceSynthetic 71Arg Val Thr Leu
Thr Ala Asp Lys Ser Thr Ser Thr Ala Tyr Met Glu1 5 10 15Leu Ser Ser
Leu Thr Ser Glu Asp Thr Ala Val Tyr Tyr Cys Thr Arg 20 25
307232PRTArtificial SequenceSynthetic 72Gly Val Pro Asp Arg Phe Ser
Gly Ser Gly Ser Gly Thr Asp Phe Thr1 5 10 15Leu Lys Ile Ser Arg Val
Glu Ala Glu Asp Val Gly Val Tyr Tyr Cys 20 25 30736PRTArtificial
SequenceSynthetic 73Phe Tyr Ser Tyr Thr Tyr1 5749PRTArtificial
SequenceSynthetic 74Ser Gln Asn Thr His Val Pro Pro Thr1
57511PRTArtificial SequenceSynthetic 75Trp Gly Gln Gly Thr Leu Val
Thr Val Ser Ser1 5 107610PRTArtificial SequenceSynthetic 76Phe Gly
Gln Gly Thr Lys Leu Glu Ile Lys1 5 1077115PRTArtificial
SequenceSynthetic 77Gln Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys
Lys Pro Gly Ala1 5 10 15Ser Val Thr Val Ser Cys Lys Ala Ser Gly Tyr
Thr Phe Thr Asp Tyr 20 25 30Glu Met His Trp Ile Arg Gln Pro Pro Gly
Glu Gly Leu Glu Trp Ile 35 40 45Gly Ala Ile Asp Pro Lys Thr Gly Asp
Thr Ala Tyr Ser Glu Ser Phe 50 55 60Gln Asp Arg Val Thr Leu Thr Ala
Asp Lys Ser Thr Ser Thr Ala Tyr65 70 75 80Met Glu Leu Ser Ser Leu
Thr Ser Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Thr Arg Phe Tyr Ser
Tyr Thr Tyr Trp Gly Gln Gly Thr Leu Val Thr 100 105 110Val Ser Ser
11578112PRTArtificial SequenceSynthetic 78Asp Ile Val Met Thr Gln
Ser Pro Leu Ser Leu Pro Val Thr Pro Gly1 5 10 15Glu Pro Ala Ser Ile
Ser Cys Gln Ala Ser Glu Ser Leu Val His Ser 20 25 30Asn Arg Asn Thr
Tyr Leu His Trp Tyr Leu Gln Lys Pro Gly Gln Ser 35 40 45Pro Gln Leu
Leu Ile Tyr Lys Val Ser Asn Arg Phe Ser Gly Val Pro 50 55 60Asp Arg
Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Lys Ile65 70 75
80Ser Arg Val Glu Ala Glu Asp Val Gly Val Tyr Tyr Cys Ser Gln Asn
85 90 95Thr His Val Pro Pro Thr Phe Gly Gln Gly Thr Lys Val Glu Ile
Glu 100 105 1107930PRTArtificial SequenceSynthetic 79Gln Val Gln
Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly Ala1 5 10 15Ser Val
Thr Val Ser Cys Lys Ala Ser Gly Tyr Thr Phe Thr 20 25
308023PRTArtificial SequenceSynthetic 80Asp Ile Val Met Thr Gln Ser
Pro Leu Ser Leu Pro Val Thr Pro Gly1 5 10 15Glu Pro Ala Ser Ile Ser
Cys 20815PRTArtificial SequenceSynthetic 81Asp Tyr Glu Met His1
58216PRTArtificial SequenceSynthetic 82Gln Ala Ser Glu Ser Leu Val
His Ser Asn Arg Asn Thr Tyr Leu His1 5 10 158314PRTArtificial
SequenceSynthetic 83Trp Ile Arg Gln Pro Pro Gly Glu Gly Leu Glu Trp
Ile Gly1 5 108415PRTArtificial SequenceSynthetic 84Trp Tyr Leu Gln
Lys Pro Gly Gln Ser Pro Gln Leu Leu Ile Tyr1 5 10
158517PRTArtificial SequenceSynthetic 85Ala Ile Asp Pro Lys Thr Gly
Asp Thr Ala Tyr Ser Glu Ser Phe Gln1 5 10 15Asp867PRTArtificial
SequenceSynthetic 86Lys Val Ser Asn Arg Phe Ser1 58732PRTArtificial
SequenceSynthetic 87Arg Val Thr Leu Thr Ala Asp Lys Ser Thr Ser Thr
Ala Tyr Met Glu1 5 10 15Leu Ser Ser Leu Thr Ser Glu Asp Thr Ala Val
Tyr Tyr Cys Thr Arg 20 25 308832PRTArtificial SequenceSynthetic
88Gly Val Pro Asp Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr1
5 10 15Leu Lys Ile Ser Arg Val Glu Ala Glu Asp Val Gly Val Tyr Tyr
Cys 20 25 30896PRTArtificial SequenceSynthetic 89Phe Tyr Ser Tyr
Thr Tyr1 5909PRTArtificial SequenceSynthetic 90Ser Gln Asn Thr His
Val Pro Pro Thr1 59111PRTArtificial SequenceSynthetic 91Trp Gly Gln
Gly Thr Leu Val Thr Val Ser Ser1 5 109210PRTArtificial
SequenceSynthetic 92Phe Gly Gln Gly Thr Lys Val Glu Ile Glu1 5
1093124PRTArtificial SequenceSynthetic 93Gln Val Gln Leu Val Gln
Ser Gly Ala Glu Val Lys Lys Pro Gly Ala1 5 10 15Ser Val Lys Val Ser
Cys Lys Thr Ser Arg Tyr Thr Phe Thr Glu Tyr 20 25 30Thr Ile His Trp
Val Arg Gln Ala Pro Gly Gln Arg Leu Glu Trp Ile 35 40 45Gly Gly Ile
Asn Pro Asn Asn Gly Ile Pro Asn Tyr Asn Gln Lys Phe 50 55 60Lys Gly
Arg Val Thr Ile Thr Val Asp Thr Ser Ala Ser Thr Ala Tyr65 70 75
80Met Glu Leu Ser Ser Leu Arg Ser Glu Asp Thr Ala Val Tyr Tyr Cys
85 90 95Ala Arg Arg Arg Ile Ala Tyr Gly Tyr Asp Glu Gly His Ala Met
Asp 100 105 110Tyr Trp Gly Gln Gly Thr Leu Val Thr Val Ser Ser 115
12094113PRTArtificial SequenceSynthetic 94Asp Ile Val Met Thr Gln
Ser Pro Asp Ser Leu Ala Val Ser Leu Gly1 5 10 15Glu Arg Ala Thr Ile
Asn Cys Lys Ser Ser Gln Ser Leu Leu Tyr Ser 20 25 30Arg Asn Gln Lys
Asn Tyr Leu Ala Trp Tyr Gln Gln Lys Pro Gly Gln 35 40 45Pro Pro Lys
Leu Leu Ile Phe Trp Ala Ser Thr Arg Glu Ser Gly Val 50 55 60Pro Asp
Arg Phe Ser Gly Ser Gly Phe Gly Thr Asp Phe Thr Leu Thr65 70 75
80Ile Ser Ser Leu Gln Ala Glu Asp Val Ala Val Tyr Tyr Cys Gln Gln
85 90 95Tyr Phe Ser Tyr Pro Leu Thr Phe Gly Gln Gly Thr Lys Val Glu
Ile 100 105 110Lys9530PRTArtificial SequenceSynthetic 95Gln Val Gln
Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly Ala1 5 10 15Ser Val
Lys Val Ser Cys Lys Thr Ser Arg Tyr Thr Phe Thr 20 25
309623PRTArtificial SequenceSynthetic 96Asp Ile Val Met Thr Gln Ser
Pro Asp Ser Leu Ala Val Ser Leu Gly1 5 10 15Glu Arg Ala Thr Ile Asn
Cys 20975PRTArtificial SequenceSynthetic 97Glu Tyr Thr Ile His1
59817PRTArtificial SequenceSynthetic 98Lys Ser Ser Gln Ser Leu Leu
Tyr Ser Arg Asn Gln Lys Asn Tyr Leu1 5 10 15Ala9914PRTArtificial
SequenceSynthetic 99Trp Val Arg Gln Ala Pro Gly Gln Arg Leu Glu Trp
Ile Gly1 5 1010015PRTArtificial SequenceSynthetic 100Trp Tyr Gln
Gln Lys Pro Gly Gln Pro Pro Lys Leu Leu Ile Phe1 5 10
1510117PRTArtificial SequenceSynthetic 101Gly Ile Asn Pro Asn Asn
Gly Ile Pro Asn Tyr Asn Gln Lys Phe Lys1 5 10
15Gly1027PRTArtificial SequenceSynthetic 102Trp Ala Ser Thr Arg Glu
Ser1 510332PRTArtificial SequenceSynthetic 103Arg Val Thr Ile Thr
Val Asp Thr Ser Ala Ser Thr Ala Tyr Met Glu1 5 10 15Leu Ser Ser Leu
Arg Ser Glu Asp Thr Ala Val Tyr Tyr Cys Ala Arg 20 25
3010432PRTArtificial SequenceSynthetic 104Gly Val Pro Asp Arg Phe
Ser Gly Ser Gly Phe Gly Thr Asp Phe Thr1 5 10 15Leu Thr Ile Ser Ser
Leu Gln Ala Glu Asp Val Ala Val Tyr Tyr Cys 20 25
3010515PRTArtificial SequenceSynthetic 105Arg Arg Ile Ala Tyr Gly
Tyr Asp Glu Gly His Ala Met Asp Tyr1 5 10 151069PRTArtificial
SequenceSynthetic 106Gln Gln Tyr Phe Ser Tyr Pro Leu Thr1
510711PRTArtificial SequenceSynthetic 107Trp Gly Gln Gly Thr Leu
Val Thr Val Ser Ser1 5 1010810PRTArtificial SequenceSynthetic
108Phe Gly Gln Gly Thr Lys Val Glu Ile Lys1 5 10109115PRTArtificial
SequenceSynthetic 109Glu Val Gln Leu Gln Gln Ser Gly Pro Glu Leu
Val Lys Pro Gly Thr1 5 10 15Ser Val Arg Ile Ser Cys Lys Thr Ser Gly
Tyr Thr Phe Thr Glu Tyr 20 25 30Thr Ile His Trp Val Lys Gln Ser His
Gly Lys Ser Leu Glu Trp Ile 35 40 45Gly Asn Ile Asn Pro Asn Asn Gly
Gly Thr Thr Tyr Asn Gln Lys Phe 50 55 60Glu Asp Lys Ala Thr Leu Thr
Val Asp Lys Ser Ser Ser Thr Ala Tyr65 70 75 80Met Glu Leu Arg Ser
Leu Thr Ser Glu Asp Ser Ala Val Tyr Tyr Cys 85 90 95Ala Ala Gly Trp
Asn Phe Asp Tyr Trp Gly Gln Gly Thr Thr Leu Thr 100 105 110Val Ser
Ser 115110107PRTArtificial SequenceSynthetic 110Asp Ile Val Met Thr
Gln Ser His Lys Phe Met Ser Thr Ser Val Gly1 5 10 15Asp Arg Val Ser
Ile Ile Cys Lys Ala Ser Gln Asp Val Gly Thr Ala 20 25 30Val Asp Trp
Tyr Gln Gln Lys Pro Gly Gln Ser Pro Lys Leu Leu Ile 35 40 45Tyr Trp
Ala Ser Thr Arg His Thr Gly Val Pro Asp Arg Phe Thr Gly 50 55 60Ser
Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Thr Asn Val Gln Ser65 70 75
80Glu Asp Leu Ala Asp Tyr Phe Cys Gln Gln Tyr Asn Ser Tyr Pro Leu
85 90 95Thr Phe Gly Ala Gly Thr Met Leu Asp Leu Lys 100
10511130PRTArtificial SequenceSynthetic 111Glu Val Gln Leu Gln Gln
Ser Gly Pro Glu Leu Val Lys Pro Gly Thr1 5 10 15Ser Val Arg Ile Ser
Cys Lys Thr Ser Gly Tyr Thr Phe Thr 20 25 3011223PRTArtificial
SequenceSynthetic 112Asp Ile Val Met Thr Gln Ser His Lys Phe Met
Ser Thr Ser Val Gly1 5 10 15Asp Arg Val Ser Ile Ile Cys
201135PRTArtificial SequenceSynthetic 113Glu Tyr Thr Ile His1
511411PRTArtificial SequenceSynthetic 114Lys Ala Ser Gln Asp Val
Gly Thr Ala Val Asp1 5 1011514PRTArtificial SequenceSynthetic
115Trp Val Lys Gln Ser His Gly Lys Ser Leu Glu Trp Ile Gly1 5
1011615PRTArtificial SequenceSynthetic 116Trp Tyr Gln Gln Lys Pro
Gly Gln Ser Pro Lys Leu Leu Ile Tyr1 5 10 1511717PRTArtificial
SequenceSynthetic 117Asn Ile Asn Pro Asn Asn Gly Gly Thr Thr Tyr
Asn Gln Lys Phe Glu1 5 10 15Asp1187PRTArtificial SequenceSynthetic
118Trp Ala Ser Thr Arg His Thr1 511932PRTArtificial
SequenceSynthetic 119Lys Ala Thr Leu Thr Val Asp Lys Ser Ser Ser
Thr Ala Tyr Met Glu1 5 10 15Leu Arg Ser Leu Thr Ser Glu Asp Ser Ala
Val Tyr Tyr Cys Ala Ala 20 25 3012032PRTArtificial
SequenceSynthetic 120Gly Val Pro Asp Arg Phe Thr Gly Ser Gly Ser
Gly Thr Asp Phe Thr1 5 10 15Leu Thr Ile Thr Asn Val Gln Ser Glu Asp
Leu Ala Asp Tyr Phe Cys 20 25 301216PRTArtificial SequenceSynthetic
121Gly Trp Asn Phe Asp Tyr1 51229PRTArtificial SequenceSynthetic
122Gln Gln Tyr Asn Ser Tyr Pro Leu Thr1 512311PRTArtificial
SequenceSynthetic 123Trp Gly Gln Gly Thr Thr Leu Thr Val Ser Ser1 5
1012410PRTArtificial SequenceSynthetic 124Phe Gly Ala Gly Thr Met
Leu Asp Leu Lys1 5 10125119PRTArtificial SequenceSynthetic 125Asp
Val Lys Leu Val Glu Ser Gly Gly Gly Leu Val Lys Leu Gly Gly1 5 10
15Ser Leu Lys Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr
20 25 30Tyr Met Ser Trp Val Arg Gln Thr Pro Glu Lys Arg Leu Glu Leu
Val 35 40 45Ala Ala Ile Asn Ser Asp Gly Gly Ile Thr Tyr Tyr Leu Asp
Thr Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn
Thr Leu Tyr65 70 75 80Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr
Ala Leu Phe Tyr Cys 85 90 95Ala Arg His Arg Ser Gly Tyr Phe Ser Met
Asp Tyr Trp Gly Gln Gly 100 105 110Thr Ser Val Thr Val Ser Ser
115126107PRTArtificial SequenceSynthetic 126Asp Ile Val Met Thr Gln
Ser Gln Arg Phe Met Ser Thr Thr Val Gly1 5 10 15Asp Arg Val Ser Ile
Thr Cys Lys Ala Ser Gln Asn Val Val Ser Ala 20 25 30Val Ala Trp Tyr
Gln Gln Lys Pro Gly Gln Ser Pro Lys Leu Leu Ile 35 40 45Tyr Ser Ala
Ser Asn Arg Tyr Thr Gly Val Pro Asp Arg Phe Thr Gly 50 55 60Ser Gly
Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Asn Met Gln Ser65 70 75
80Glu Asp Leu Ala Asp Phe Phe Cys Gln Gln Tyr Ser Asn Tyr Pro Trp
85 90 95Thr Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys 100
10512730PRTArtificial SequenceSynthetic 127Asp Val Lys Leu Val Glu
Ser Gly Gly Gly Leu Val Lys Leu Gly Gly1 5 10 15Ser Leu Lys Leu Ser
Cys Ala Ala Ser Gly Phe Thr Phe Ser 20 25 3012823PRTArtificial
SequenceSynthetic 128Asp Ile Val Met Thr Gln Ser Gln Arg Phe Met
Ser Thr Thr Val Gly1 5 10 15Asp Arg Val Ser Ile Thr Cys
201295PRTArtificial SequenceSynthetic 129Asn Tyr Tyr Met Ser1
513011PRTArtificial SequenceSynthetic 130Lys Ala Ser Gln Asn Val
Val Ser Ala Val Ala1 5 1013114PRTArtificial SequenceSynthetic
131Trp Val Arg Gln Thr Pro Glu Lys Arg Leu Glu Leu Val Ala1 5
1013215PRTArtificial SequenceSynthetic 132Trp Tyr Gln Gln Lys Pro
Gly Gln Ser Pro Lys Leu Leu Ile Tyr1 5 10 1513317PRTArtificial
SequenceSynthetic 133Ala Ile Asn Ser Asp Gly Gly Ile Thr Tyr Tyr
Leu Asp Thr Val Lys1 5 10 15Gly1347PRTArtificial SequenceSynthetic
134Ser Ala Ser Asn Arg Tyr Thr1 513532PRTArtificial
SequenceSynthetic 135Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn
Thr Leu Tyr Leu Gln1 5 10 15Met Ser Ser Leu Lys Ser Glu Asp Thr Ala
Leu Phe Tyr Cys Ala Arg 20 25 3013632PRTArtificial
SequenceSynthetic 136Gly Val Pro Asp Arg Phe Thr Gly Ser Gly Ser
Gly Thr Asp Phe Thr1 5 10 15Leu Thr Ile Ser Asn Met Gln Ser Glu Asp
Leu Ala Asp Phe Phe Cys 20 25 3013710PRTArtificial
SequenceSynthetic 137His Arg Ser Gly Tyr Phe Ser Met Asp Tyr1 5
101389PRTArtificial SequenceSynthetic 138Gln Gln Tyr Ser Asn Tyr
Pro Trp Thr1 513911PRTArtificial SequenceSynthetic 139Trp Gly Gln
Gly Thr Ser Val Thr Val Ser Ser1 5 1014010PRTArtificial
SequenceSynthetic 140Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys1 5
10141117PRTArtificial SequenceSynthetic 141Gln Val Gln Leu Gln Gln
Pro Gly Ala Glu Leu Val Lys Ser Gly Ala1 5 10 15Ser Val Asn Leu Ser
Cys Arg Ala Ser Gly Tyr Thr Phe Thr Arg Tyr 20 25 30Trp Met Leu Trp
Val Arg Gln Arg Pro Gly His Gly Leu Glu Trp Val 35 40 45Gly Glu Ile
Asn Pro Arg Asn Asp Arg Thr Asn Tyr Asn Glu Lys Phe 50 55 60Lys Thr
Lys Ala Thr Leu Thr Val Asp Arg Ser Ser Ser Thr Ala Tyr65 70 75
80Met Gln Leu Thr Ser Leu Thr Ser Glu Asp Ser Ala Val Tyr Phe Cys
85 90 95Ala Leu Gly Gly Gly Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr
Ser 100 105 110Val Thr Val Ser Ser 115142107PRTArtificial
SequenceSynthetic 142Asp Ile Gln Met Thr Gln Thr Thr Ser Ser Leu
Ser Ala Phe Leu Gly1 5 10 15Asp Arg Val Thr Ile Ser Cys Arg Ala Ser
Gln Asp Ile Ser Asn Tyr 20 25 30Leu Asn Trp Tyr Gln Gln Lys Pro
Asp Gly Thr Val Lys Leu Leu Ile 35 40 45Tyr Tyr Thr Ser Arg Leu His
Ser Gly Val Pro Ser Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly Thr Asp
Tyr Ser Leu Thr Ile Ser Asn Leu Glu Gln65 70 75 80Glu Asp Phe Ala
Thr Tyr Phe Cys Gln Gln Gly Asn Thr Leu Pro Trp 85 90 95Thr Phe Gly
Gly Gly Thr Lys Leu Glu Ile Lys 100 10514330PRTArtificial
SequenceSynthetic 143Gln Val Gln Leu Gln Gln Pro Gly Ala Glu Leu
Val Lys Ser Gly Ala1 5 10 15Ser Val Asn Leu Ser Cys Arg Ala Ser Gly
Tyr Thr Phe Thr 20 25 3014423PRTArtificial SequenceSynthetic 144Asp
Ile Gln Met Thr Gln Thr Thr Ser Ser Leu Ser Ala Phe Leu Gly1 5 10
15Asp Arg Val Thr Ile Ser Cys 201455PRTArtificial SequenceSynthetic
145Arg Tyr Trp Met Leu1 514611PRTArtificial SequenceSynthetic
146Arg Ala Ser Gln Asp Ile Ser Asn Tyr Leu Asn1 5
1014714PRTArtificial SequenceSynthetic 147Trp Val Arg Gln Arg Pro
Gly His Gly Leu Glu Trp Val Gly1 5 1014815PRTArtificial
SequenceSynthetic 148Trp Tyr Gln Gln Lys Pro Asp Gly Thr Val Lys
Leu Leu Ile Tyr1 5 10 1514917PRTArtificial SequenceSynthetic 149Glu
Ile Asn Pro Arg Asn Asp Arg Thr Asn Tyr Asn Glu Lys Phe Lys1 5 10
15Thr1507PRTArtificial SequenceSynthetic 150Tyr Thr Ser Arg Leu His
Ser1 515132PRTArtificial SequenceSynthetic 151Lys Ala Thr Leu Thr
Val Asp Arg Ser Ser Ser Thr Ala Tyr Met Gln1 5 10 15Leu Thr Ser Leu
Thr Ser Glu Asp Ser Ala Val Tyr Phe Cys Ala Leu 20 25
3015232PRTArtificial SequenceSynthetic 152Gly Val Pro Ser Arg Phe
Ser Gly Ser Gly Ser Gly Thr Asp Tyr Ser1 5 10 15Leu Thr Ile Ser Asn
Leu Glu Gln Glu Asp Phe Ala Thr Tyr Phe Cys 20 25
301538PRTArtificial SequenceSynthetic 153Gly Gly Gly Tyr Ala Met
Asp Tyr1 51549PRTArtificial SequenceSynthetic 154Gln Gln Gly Asn
Thr Leu Pro Trp Thr1 515511PRTArtificial SequenceSynthetic 155Trp
Gly Gln Gly Thr Ser Val Thr Val Ser Ser1 5 1015610PRTArtificial
SequenceSynthetic 156Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys1 5
10157117PRTArtificial SequenceSynthetic 157Glu Val Gln Leu Val Gln
Ser Gly Gly Gly Leu Val Gln Ser Gly Gly1 5 10 15Ser Leu Arg Leu Ser
Cys Arg Ala Ser Gly Tyr Thr Phe Thr Arg Tyr 20 25 30Trp Met Leu Trp
Val Arg Gln Arg Pro Gly His Gly Leu Glu Trp Val 35 40 45Gly Glu Ile
Asn Pro Arg Asn Asp Arg Thr Asn Tyr Asn Glu Lys Phe 50 55 60Lys Thr
Arg Phe Thr Ile Ser Val Asp Arg Ser Lys Ser Thr Ala Tyr65 70 75
80Leu Gln Met Asp Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Phe Cys
85 90 95Ala Leu Gly Gly Gly Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr
Leu 100 105 110Val Thr Val Ser Ser 115158107PRTArtificial
SequenceSynthetic 158Asp 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 Asp Ile Ser Asn Tyr 20 25 30Leu Asn Trp Tyr Gln Gln Lys Pro Gly
Lys Ala Pro Lys Leu Leu Ile 35 40 45Tyr Tyr Thr Ser Arg Leu His Ser
Gly Val Pro Ser Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly Thr Asp Tyr
Thr Leu Thr Ile Ser Ser Leu Gln Pro65 70 75 80Glu Asp Phe Ala Thr
Tyr Phe Cys Gln Gln Gly Asn Thr Leu Pro Trp 85 90 95Thr Phe Gly Gly
Gly Thr Lys Leu Glu Ile Lys 100 10515930PRTArtificial
SequenceSyntheti 159Glu Val Gln Leu Val Gln Ser Gly Gly Gly Leu Val
Gln Ser Gly Gly1 5 10 15Ser Leu Arg Leu Ser Cys Arg Ala Ser Gly Tyr
Thr Phe Thr 20 25 3016023PRTArtificial SequenceSyntheti 160Asp Ile
Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp
Arg Val Thr Ile Thr Cys 201615PRTArtificial SequenceSynthetic
161Arg Tyr Trp Met Leu1 516211PRTArtificial SequenceSynthetic
162Arg Ala Ser Gln Asp Ile Ser Asn Tyr Leu Asn1 5
1016314PRTArtificial SequenceSynthetic 163Trp Val Arg Gln Arg Pro
Gly His Gly Leu Glu Trp Val Gly1 5 1016415PRTArtificial
SequenceSynthetic 164Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys
Leu Leu Ile Tyr1 5 10 1516517PRTArtificial SequenceSynthetic 165Glu
Ile Asn Pro Arg Asn Asp Arg Thr Asn Tyr Asn Glu Lys Phe Lys1 5 10
15Thr1667PRTArtificial SequenceSynthetic 166Tyr Thr Ser Arg Leu His
Ser1 516732PRTArtificial SequenceSynthetic 167Arg Phe Thr Ile Ser
Val Asp Arg Ser Lys Ser Thr Ala Tyr Leu Gln1 5 10 15Met Asp Ser Leu
Arg Ala Glu Asp Thr Ala Val Tyr Phe Cys Ala Leu 20 25
3016832PRTArtificial SequenceSynthetic 168Gly Val Pro Ser Arg Phe
Ser Gly Ser Gly Ser Gly Thr Asp Tyr Thr1 5 10 15Leu Thr Ile Ser Ser
Leu Gln Pro Glu Asp Phe Ala Thr Tyr Phe Cys 20 25
301698PRTArtificial SequenceSynthetic 169Gly Gly Gly Tyr Ala Met
Asp Tyr1 51709PRTArtificial SequenceSynthetic 170Gln Gln Gly Asn
Thr Leu Pro Trp Thr1 517111PRTArtificial SequenceSynthetic 171Trp
Gly Gln Gly Thr Leu Val Thr Val Ser Ser1 5 1017210PRTArtificial
SequenceSynthetic 172Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys1 5
10173117PRTArtificial SequenceSynthetic 173Glu Val Gln Leu Val Gln
Ser Gly Gly Gly Leu Val Gln Ser Gly Gly1 5 10 15Ser Leu Arg Leu Ser
Cys Arg Ala Ser Gly Tyr Thr Phe Thr Arg Tyr 20 25 30Trp Met Leu Trp
Val Arg Gln Arg Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Glu Ile
Asn Pro Arg Asn Asp Arg Thr Asn Tyr Asn Glu Lys Phe 50 55 60Lys Thr
Arg Phe Thr Ile Ser Val Asp Arg Ser Lys Asn Thr Leu Tyr65 70 75
80Leu Gln Met Asp Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Phe Cys
85 90 95Ala Leu Gly Gly Gly Tyr Ala Met Asp Tyr Trp Gly Gln Gly Thr
Leu 100 105 110Val Thr Val Ser Ser 115174107PRTArtificial
SequenceSynthetic 174Asp 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 Asp Ile Ser Asn Tyr 20 25 30Leu Asn Trp Tyr Gln Gln Lys Pro Gly
Lys Ala Pro Lys Leu Leu Ile 35 40 45Tyr Tyr Thr Ser Arg Leu His Ser
Gly Val Pro Ser Arg Phe Ser Gly 50 55 60Ser Gly Ser Gly Thr Asp Tyr
Thr Leu Thr Ile Ser Ser Leu Gln Pro65 70 75 80Glu Asp Phe Ala Thr
Tyr Phe Cys Gln Gln Gly Asn Thr Leu Pro Trp 85 90 95Thr Phe Gly Gly
Gly Thr Lys Leu Glu Ile Lys 100 10517530PRTArtificial
SequenceSynthetic 175Glu Val Gln Leu Val Gln Ser Gly Gly Gly Leu
Val Gln Ser Gly Gly1 5 10 15Ser Leu Arg Leu Ser Cys Arg Ala Ser Gly
Tyr Thr Phe Thr 20 25 3017623PRTArtificial SequenceSynthetic 176Asp
Ile Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10
15Asp Arg Val Thr Ile Thr Cys 201775PRTArtificial SequenceSynthetic
177Arg Tyr Trp Met Leu1 517811PRTArtificial SequenceSynthetic
178Arg Ala Ser Gln Asp Ile Ser Asn Tyr Leu Asn1 5
1017914PRTArtificial SequenceSynthetic 179Trp Val Arg Gln Arg Pro
Gly Lys Gly Leu Glu Trp Val Ala1 5 1018015PRTArtificial
SequenceSynthetic 180Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys
Leu Leu Ile Tyr1 5 10 1518117PRTArtificial SequenceSynthetic 181Glu
Ile Asn Pro Arg Asn Asp Arg Thr Asn Tyr Asn Glu Lys Phe Lys1 5 10
15Thr1827PRTArtificial SequenceSynthetic 182Tyr Thr Ser Arg Leu His
Ser1 518332PRTArtificial SequenceSynthetic 183Arg Phe Thr Ile Ser
Val Asp Arg Ser Lys Asn Thr Leu Tyr Leu Gln1 5 10 15Met Asp Ser Leu
Arg Ala Glu Asp Thr Ala Val Tyr Phe Cys Ala Leu 20 25
3018432PRTArtificial SequenceSynthetic 184Gly Val Pro Ser Arg Phe
Ser Gly Ser Gly Ser Gly Thr Asp Tyr Thr1 5 10 15Leu Thr Ile Ser Ser
Leu Gln Pro Glu Asp Phe Ala Thr Tyr Phe Cys 20 25
301858PRTArtificial SequenceSynthetic 185Gly Gly Gly Tyr Ala Met
Asp Tyr1 51869PRTArtificial SequenceSynthetic 186Gln Gln Gly Asn
Thr Leu Pro Trp Thr1 518711PRTArtificial SequenceSynthetic 187Trp
Gly Gln Gly Thr Leu Val Thr Val Ser Ser1 5 1018810PRTArtificial
SequenceSynthetic 188Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys1 5
1018915PRTArtificial SequenceSynthetic 189Leu Val Ala Leu Tyr Leu
Ala Ala Arg Leu Ser Trp Asn Gln Val1 5 10 1519015PRTArtificial
SequenceSynthetic 190Gly Ala Leu Leu Arg Val Tyr Val Pro Arg Ser
Ser Leu Pro Gly1 5 10 1519115PRTArtificial SequenceSynthetic 191Ile
Arg Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Arg Ser Ser1 5 10
1519215PRTArtificial SequenceSynthetic 192Arg Gln Pro Arg Gly Trp
Glu Gln Leu Glu Gln Cys Gly Tyr Pro1 5 10 1519315PRTArtificial
SequenceSynthetic 193Leu Pro Leu Glu Thr Phe Thr Arg His Arg Gln
Pro Arg Gly Trp1 5 10 1519415PRTArtificial SequenceSynthetic 194Trp
Arg Gly Phe Tyr Ile Ala Gly Asp Pro Ala Leu Ala Tyr Gly1 5 10
1519518PRTArtificial SequenceSynthetic 195Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro1 5 10 15Leu
Ala19615PRTArtificial SequenceSynthetic 196Thr Val Glu Arg Leu Leu
Gln Ala His Arg Gln Leu Glu Glu Arg1 5 10 1519718PRTArtificial
SequenceSynthetic 197Phe Val Gly Tyr His Gly Thr Phe Leu Glu Ala
Ala Gln Ser Ile Val1 5 10 15Phe Gly19815PRTArtificial
SequenceSynthetic 198Ile Arg Asn Gly Ala Leu Leu Arg Val Tyr Val
Pro Arg Ser Ser1 5 10 1519915PRTArtificial SequenceSynthetic 199Ala
Arg Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Arg Ser Ser1 5 10
1520015PRTArtificial SequenceSynthetic 200Ile Ala Asn Gly Ala Leu
Leu Arg Val Tyr Val Pro Arg Ser Ser1 5 10 1520115PRTArtificial
SequenceSynthetic 201Ile Arg Ala Gly Ala Leu Leu Arg Val Tyr Val
Pro Arg Ser Ser1 5 10 1520215PRTArtificial SequenceSynthetic 202Ile
Arg Asn Ala Ala Leu Leu Arg Val Tyr Val Pro Arg Ser Ser1 5 10
1520315PRTArtificial SequenceSynthetic 203Ile Arg Asn Gly Ala Ala
Leu Arg Val Tyr Val Pro Arg Ser Ser1 5 10 1520415PRTArtificial
SequenceSynthetic 204Ile Arg Asn Gly Ala Leu Ala Arg Val Tyr Val
Pro Arg Ser Ser1 5 10 1520515PRTArtificial SequenceSynthetic 205Ile
Arg Asn Gly Ala Leu Leu Ala Val Tyr Val Pro Arg Ser Ser1 5 10
1520615PRTArtificial SequenceSynthetic 206Ile Arg Asn Gly Ala Leu
Leu Arg Ala Tyr Val Pro Arg Ser Ser1 5 10 1520715PRTArtificial
SequenceSynthetic 207Ile Arg Asn Gly Ala Leu Leu Arg Val Ala Val
Pro Arg Ser Ser1 5 10 1520815PRTArtificial SequenceSynthetic 208Ile
Arg Asn Gly Ala Leu Leu Arg Val Tyr Ala Pro Arg Ser Ser1 5 10
1520915PRTArtificial SequenceSynthetic 209Ile Arg Asn Gly Ala Leu
Leu Arg Val Tyr Val Ala Arg Ser Ser1 5 10 1521015PRTArtificial
SequenceSynthetic 210Ile Arg Asn Gly Ala Leu Leu Arg Val Tyr Val
Pro Ala Ser Ser1 5 10 1521115PRTArtificial SequenceSynthetic 211Ile
Arg Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Arg Ala Ser1 5 10
1521215PRTArtificial SequenceSynthetic 212Ile Arg Asn Gly Ala Leu
Leu Arg Val Tyr Val Pro Arg Ser Ala1 5 10 1521315PRTArtificial
SequenceSynthetic 213Gly Ala Leu Leu Arg Val Tyr Val Pro Arg Ser
Ser Leu Pro Gly1 5 10 1521415PRTArtificial SequenceSynthetic 214Ala
Ala Leu Leu Arg Val Tyr Val Pro Arg Ser Ser Leu Pro Gly1 5 10
1521515PRTArtificial SequenceSynthetic 215Gly Gly Leu Leu Arg Val
Tyr Val Pro Arg Ser Ser Leu Pro Gly1 5 10 1521615PRTArtificial
SequenceSynthetic 216Gly Ala Ala Leu Arg Val Tyr Val Pro Arg Ser
Ser Leu Pro Gly1 5 10 1521715PRTArtificial SequenceSynthetic 217Gly
Ala Leu Ala Arg Val Tyr Val Pro Arg Ser Ser Leu Pro Gly1 5 10
1521815PRTArtificial SequenceSynthetic 218Gly Ala Leu Leu Ala Val
Tyr Val Pro Arg Ser Ser Leu Pro Gly1 5 10 1521915PRTArtificial
SequenceSynthetic 219Gly Ala Leu Leu Arg Ala Tyr Val Pro Arg Ser
Ser Leu Pro Gly1 5 10 1522015PRTArtificial SequenceSynthetic 220Gly
Ala Leu Leu Arg Val Ala Val Pro Arg Ser Ser Leu Pro Gly1 5 10
1522115PRTArtificial SequenceSynthetic 221Gly Ala Leu Leu Arg Val
Tyr Ala Pro Arg Ser Ser Leu Pro Gly1 5 10 1522215PRTArtificial
SequenceSynthetic 222Gly Ala Leu Leu Arg Val Tyr Val Ala Arg Ser
Ser Leu Pro Gly1 5 10 1522315PRTArtificial SequenceSynthetic 223Gly
Ala Leu Leu Arg Val Tyr Val Pro Ala Ser Ser Leu Pro Gly1 5 10
1522415PRTArtificial SequenceSynthetic 224Gly Ala Leu Leu Arg Val
Tyr Val Pro Arg Ala Ser Leu Pro Gly1 5 10 1522512PRTArtificial
SequenceSynthetic 225Gly Ala Leu Leu Arg Val Tyr Val Pro Arg Ser
Ala1 5 1022615PRTArtificial SequenceSynthetic 226Gly Ala Leu Leu
Arg Val Tyr Val Pro Arg Ser Ser Ala Pro Gly1 5 10
1522715PRTArtificial SequenceSynthetic 227Gly Ala Leu Leu Arg Val
Tyr Val Pro Arg Ser Ser Leu Ala Gly1 5 10 1522815PRTArtificial
SequenceSynthetic 228Trp Arg Gly Phe Tyr Ile Ala Gly Asp Pro Ala
Leu Ala Tyr Gly1 5 10 1522915PRTArtificial SequenceSynthetic 229Trp
Arg Gly Ala Tyr Ile Ala Gly Asp Pro Ala Leu Ala Tyr Gly1 5 10
1523015PRTArtificial SequenceSynthetic 230Trp Arg Gly Phe Ala Ile
Ala Gly Asp Pro Ala Leu Ala Tyr Gly1 5 10 1523115PRTArtificial
SequenceSynthetic 231Trp Arg Gly Phe Tyr Ala Ala Gly Asp Pro Ala
Leu Ala Tyr Gly1 5 10 1523215PRTArtificial SequenceSynthetic 232Trp
Arg Gly Phe Tyr Ile Gly Gly Asp Pro Ala Leu Ala Tyr Gly1 5 10
1523315PRTArtificial SequenceSynthetic 233Trp Arg Gly Phe Tyr Ile
Ala Gly Asp Ala Ala Leu Ala Tyr Gly1 5 10 1523415PRTArtificial
SequenceSynthetic 234Trp Arg Gly Phe Tyr Ile Ala Gly Asp Pro Gly
Leu Ala Tyr Gly1 5 10 1523515PRTArtificial SequenceSynthetic 235Trp
Arg Gly Phe Tyr Ile Ala Gly Asp Pro Ala Ala Ala Tyr Gly1 5 10
1523615PRTArtificial SequenceSynthetic 236Trp Arg Gly Phe Tyr
Ile Ala Gly Asp Pro Ala Leu Gly Tyr Gly1 5 10 1523715PRTArtificial
SequenceSynthetic 237Trp Arg Gly Phe Tyr Ile Ala Gly Asp Pro Ala
Leu Ala Ala Gly1 5 10 1523818PRTArtificial SequenceSynthetic 238Gly
Pro Glu Glu Glu Gly Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro1 5 10
15Leu Ala23918PRTArtificial SequenceSynthetic 239Gly Pro Glu Ala
Glu Gly Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro1 5 10 15Leu
Ala24018PRTArtificial SequenceSynthetic 240Gly Pro Glu Glu Ala Gly
Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro1 5 10 15Leu
Ala24118PRTArtificial SequenceSynthetic 241Gly Pro Glu Glu Glu Gly
Gly Ala Leu Glu Thr Ile Leu Gly Trp Pro1 5 10 15Leu
Ala24218PRTArtificial SequenceSynthetic 242Gly Pro Glu Glu Glu Gly
Gly Arg Ala Glu Thr Ile Leu Gly Trp Pro1 5 10 15Leu
Ala24318PRTArtificial SequenceSynthetic 243Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Ala Ile Leu Gly Trp Pro1 5 10 15Leu
Ala24418PRTArtificial SequenceSynthetic 244Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ala Leu Gly Trp Pro1 5 10 15Leu
Ala24518PRTArtificial SequenceSynthetic 245Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ile Ala Gly Trp Pro1 5 10 15Leu
Ala24618PRTArtificial SequenceSynthetic 246Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ile Leu Gly Ala Pro1 5 10 15Leu
Ala24718PRTArtificial SequenceSynthetic 247Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ile Leu Gly Trp Ala1 5 10 15Leu
Ala24818PRTArtificial SequenceSynthetic 248Gly Pro Glu Glu Glu Gly
Gly Arg Leu Glu Thr Ile Leu Gly Trp Pro1 5 10 15Ala
Ala24915PRTArtificial SequenceSynthetic 249Thr Val Glu Arg Leu Leu
Gln Ala His Arg Gln Leu Glu Glu Arg1 5 10 1525015PRTArtificial
SequenceSynthetic 250Thr Val Glu Ala Leu Leu Gln Ala His Arg Gln
Leu Glu Glu Arg1 5 10 1525115PRTArtificial SequenceSynthetic 251Thr
Val Glu Arg Ala Leu Gln Ala His Arg Gln Leu Glu Glu Arg1 5 10
1525215PRTArtificial SequenceSynthetic 252Thr Val Glu Arg Leu Ala
Gln Ala His Arg Gln Leu Glu Glu Arg1 5 10 1525315PRTArtificial
SequenceSynthetic 253Thr Val Glu Arg Leu Leu Gln Gly His Arg Gln
Leu Glu Glu Arg1 5 10 1525415PRTArtificial SequenceSynthetic 254Thr
Val Glu Arg Leu Leu Gln Ala His Ala Gln Leu Glu Glu Arg1 5 10
1525515PRTArtificial SequenceSynthetic 255Thr Val Glu Arg Leu Leu
Gln Ala His Arg Gln Ala Glu Glu Arg1 5 10 1525615PRTArtificial
SequenceSynthetic 256Thr Val Glu Arg Leu Leu Gln Ala His Arg Gln
Leu Ala Glu Arg1 5 10 1525715PRTArtificial SequenceSynthetic 257Thr
Val Glu Arg Leu Leu Gln Ala His Arg Gln Leu Glu Glu Ala1 5 10
1525818PRTArtificial SequenceSynthetic 258Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly25918PRTArtificial SequenceSynthetic 259Ala Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26018PRTArtificial SequenceSynthetic 260Phe Ala Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26118PRTArtificial SequenceSynthetic 261Phe Val Ala Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26218PRTArtificial SequenceSynthetic 262Phe Val Gly Ala His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26318PRTArtificial SequenceSynthetic 263Phe Val Gly Tyr Ala Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26418PRTArtificial SequenceSynthetic 264Phe Val Gly Tyr His Gly
Ala Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26518PRTArtificial SequenceSynthetic 265Phe Val Gly Tyr His Gly
Thr Ala Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26618PRTArtificial SequenceSynthetic 266Phe Val Gly Tyr His Gly
Thr Phe Ala Glu Ala Ala Gln Ser Ile Val1 5 10 15Phe
Gly26718PRTArtificial SequenceSynthetic 267Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Gly Ala Gln Ser Ile Val1 5 10 15Phe
Gly26818PRTArtificial SequenceSynthetic 268Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Gly Gln Ser Ile Val1 5 10 15Phe
Gly26918PRTArtificial SequenceSynthetic 269Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ala Ile Val1 5 10 15Phe
Gly27018PRTArtificial SequenceSynthetic 270Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ala Val1 5 10 15Phe
Gly27118PRTArtificial SequenceSynthetic 271Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Ala1 5 10 15Phe
Gly27218PRTArtificial SequenceSynthetic 272Phe Val Gly Tyr His Gly
Thr Phe Leu Glu Ala Ala Gln Ser Ile Val1 5 10 15Ala
Gly27342PRTArtificial SequenceSynthetic 273Asn Thr Lys Val Asp Lys
Lys Val Glu Pro Lys Ser Cys Lys Ala Ser1 5 10 15Gly Gly Arg His Arg
Gln Pro Arg Gly Trp Glu Gln Leu Gly Gly Ser 20 25 30Pro Thr Gly Ala
Glu Phe Leu Gly Asp Gly 35 402749PRTArtificial SequenceSynthetic
274Trp Glu Gln Leu Gly Gly Ser Pro Thr1 52759PRTArtificial
SequenceSynthetic 275Val Glu Pro Lys Ser Cys Lys Ala Ser1
52764PRTArtificial SequenceSynthetic 276Asp Lys Thr
His12773PRTArtificial SequenceSynthetic 277Gly Gly
Gly127849PRTArtificial SequenceSynthetic 278Asn Thr Lys Val Asp Lys
Lys Val Glu Pro Lys Ser Cys Asp Lys Thr1 5 10 15His Lys Ala Ser Gly
Gly Arg His Arg Gln Pro Arg Gly Trp Glu Gln 20 25 30Leu Gly Gly Gly
Gly Gly Ser Pro Thr Gly Ala Glu Phe Leu Gly Asp 35 40
45Gly2799PRTArtificial SequenceSynthetic 279Trp Glu Gln Leu Gly Gly
Gly Gly Gly1 52809PRTArtificial SequenceSynthetic 280Leu Gly Gly
Gly Gly Gly Ser Pro Thr1 528119PRTArtificial SequenceSynthetic
281Lys Ala Ser Gly Gly Arg His Arg Gln Pro Arg Gly Trp Glu Gln Leu1
5 10 15Gly Gly Ser2829PRTArtificial SequenceSynthetic 282Asp Lys
Thr His Lys Ala Ser Gly Gly1 52833PRTArtificial SequenceSynthetic
283Gly Gly Ser12846PRTArtificial SequenceSynthetic 284Gly Gly Gly
Gly Gly Ser1 5285219PRTArtificial SequenceSynthetic 285Pro Thr Gly
Ala Glu Phe Leu Gly Asp Gly Gly Asp Val Ser Phe Ser1 5 10 15Thr Arg
Gly Thr Gln Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His 20 25 30Ala
Gln Leu Glu Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr 35 40
45Ala Leu Glu Ala Ala Gln Ser Ile Val Phe Gly Gly Val Ala Ala Arg
50 55 60Ser Gln Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala Gly
Asp65 70 75 80Pro Ala His Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro
Asp Ala Ala 85 90 95Gly Arg Ile Ala Asn Gly Ala Leu Leu Arg Val Tyr
Val Pro Ala Ser 100 105 110Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu
Thr Leu Ala Ala Pro Glu 115 120 125Ala Ala Gly Glu Val Glu Arg Leu
Ile Gly His Pro Leu Pro Leu Ala 130 135 140Leu Asp Ala Ile Thr Gly
Pro Glu Glu Glu Gly Gly Arg Glu Glu Thr145 150 155 160Ile Leu Gly
Trp Pro Leu Ala Glu Arg Thr Val Val Ile Pro Ser Ala 165 170 175Ile
Pro Thr Asp Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser 180 185
190Ile Pro Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser
195 200 205Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 210
215286219PRTArtificial SequenceSynthetic 286Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly Asp Val Ser Phe Ser1 5 10 15Thr Arg Gly Thr Gln
Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His 20 25 30Ala Gln Leu Glu
Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr 35 40 45Ala Leu Glu
Ala Ala Gln Ser Ile Val Phe Gly Gly Val Ala Ala Arg 50 55 60Ser Gln
Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala Gly Asp65 70 75
80Pro Ala His Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Ala
85 90 95Gly Arg Ile Ala Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Ala
Ser 100 105 110Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu Thr Leu Ala
Ala Pro Glu 115 120 125Ala Ala Gly Glu Val Glu Arg Leu Ile Gly His
Pro Leu Pro Leu Ala 130 135 140Leu Asp Ala Ile Thr Gly Pro Glu Glu
Glu Gly Gly Arg Asn Glu Thr145 150 155 160Ile Leu Gly Trp Pro Leu
Ala Glu Arg Thr Val Val Ile Pro Ser Ala 165 170 175Ile Pro Thr Asp
Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser 180 185 190Ile Pro
Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser 195 200
205Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 210
215287219PRTArtificial SequenceSynthetic 287Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly Asp Val Ser Phe Ser1 5 10 15Thr Arg Gly Thr Gln
Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His 20 25 30Ala Gln Leu Glu
Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr 35 40 45Ala Leu Glu
Ala Ala Gln Ser Ile Val Phe Gly Gly Val Arg Ala Arg 50 55 60Ser Gln
Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala Gly Asp65 70 75
80Pro Ala His Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Ala
85 90 95Gly Arg Ile Ala Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Ala
Ser 100 105 110Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu Thr Leu Ala
Ala Pro Glu 115 120 125Ala Ala Gly Glu Val Glu Arg Leu Ile Gly His
Pro Leu Pro Leu Ala 130 135 140Leu Asp Ala Ile Thr Gly Pro Glu Glu
Glu Gly Gly Arg Glu Glu Thr145 150 155 160Ile Leu Gly Trp Pro Leu
Ala Glu Arg Thr Val Val Ile Pro Ser Ala 165 170 175Ile Pro Thr Asp
Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser 180 185 190Ile Pro
Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser 195 200
205Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 210
215288219PRTArtificial SequenceSynthetic 288Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly Asp Val Ser Phe Ser1 5 10 15Thr Arg Gly Thr Gln
Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His 20 25 30Ala Gln Leu Glu
Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr 35 40 45Ala Leu Glu
Ala Ala Gln Ser Ile Val Phe Gly Gly Val Arg Ala Arg 50 55 60Ser Gln
Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala Gly Asp65 70 75
80Pro Ala His Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Ala
85 90 95Gly Arg Ile Ala Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Ala
Ser 100 105 110Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu Thr Leu Ala
Ala Pro Glu 115 120 125Ala Ala Gly Glu Val Glu Arg Leu Ile Gly His
Pro Leu Pro Leu Ala 130 135 140Leu Asp Ala Ile Thr Gly Pro Glu Glu
Glu Gly Gly Arg Asn Glu Thr145 150 155 160Ile Leu Gly Trp Pro Leu
Ala Glu Arg Thr Val Val Ile Pro Ser Ala 165 170 175Ile Pro Thr Asp
Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser 180 185 190Ile Pro
Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser 195 200
205Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 210
215289219PRTArtificial SequenceSynthetic 289Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly Asp Val Ser Phe Ser1 5 10 15Thr Arg Gly Thr Gln
Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His 20 25 30Ala Gln Leu Glu
Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr 35 40 45Ala Leu Glu
Ala Ala Gln Ser Ile Val Phe Gly Gly Val Arg Ala Arg 50 55 60Ser Gln
Asp Leu Asp Ala Ile Trp Arg Gly Phe Tyr Ile Ala Gly Asp65 70 75
80Pro Ala His Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Arg
85 90 95Gly Arg Ile Ala Asn Gly Ala Leu Leu Arg Val Tyr Val Pro Ala
Ser 100 105 110Ser Leu Pro Gly Phe Tyr Arg Thr Ser Leu Thr Leu Ala
Ala Pro Glu 115 120 125Ala Ala Gly Glu Val Glu Arg Leu Ile Gly His
Pro Leu Pro Leu Arg 130 135 140Leu Asp Ala Ile Thr Gly Pro Glu Glu
Glu Gly Gly Arg Glu Glu Thr145 150 155 160Ile Leu Gly Trp Pro Leu
Ala Glu Arg Thr Val Val Ile Pro Ser Ala 165 170 175Ile Pro Thr Asp
Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser 180 185 190Ile Pro
Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser 195 200
205Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys 210
215290113PRTArtificial SequenceSynthetic 290Asp Ile Val Leu Thr Gln
Ser Pro Asp Ser Leu Ala Val Ser Leu Gly1 5 10 15Glu Arg Ala Thr Ile
Asn Cys Lys Ser Ser Gln Ser Leu Leu Tyr Ser 20 25 30Arg Asn Gln Lys
Asn Tyr Leu Ala Trp Tyr Gln Gln Lys Pro Gly Gln 35 40 45Pro Pro Lys
Leu Leu Ile Phe Trp Ala Ser Thr Arg Glu Ser Gly Val 50 55 60Pro Asp
Arg Phe Ser Gly Ser Gly Phe Gly Thr Asp Phe Thr Leu Thr65 70 75
80Ile Ser Ser Leu Gln Ala Glu Asp Val Ala Val Tyr Tyr Cys Gln Gln
85 90 95Tyr Phe Ser Tyr Pro Leu Thr Phe Gly Gln Gly Thr Lys Val Glu
Ile 100 105 110Lys291473PRTArtificial SequenceSynthetic 291Met Gln
Val Gln Leu Val Gln Ser Gly Ala Glu Val Lys Lys Pro Gly1 5 10 15Ala
Ser Val Lys Val Ser Cys Lys Thr Ser Arg Tyr Thr Phe Thr Glu 20 25
30Tyr Thr Ile His Trp Val Arg Gln Ala Pro Gly Gln Arg Leu Glu Trp
35 40 45Ile Gly Gly Ile Asn Pro Asn Asn Gly Ile Pro Asn Tyr Asn Gln
Lys 50 55 60Phe Lys Gly Arg Val Thr Ile Thr Val Asp Thr Ser Ala Ser
Thr Ala65 70 75 80Tyr Met Glu Leu Ser Ser Leu Arg Ser Glu Asp Thr
Ala Val Tyr Tyr 85 90 95Cys Ala Arg Arg Arg Ile Ala Tyr Gly Tyr Asp
Glu Gly His Ala Met 100 105 110Asp Tyr Trp Gly Gln Gly Thr Leu Val
Thr Val Ser Ser Ala Ser Thr 115 120 125Lys Gly Pro Ser Val Phe Pro
Leu Ala Pro Ser Ser Lys Ser Thr Ser 130 135 140Gly Gly Thr Ala Ala
Leu Gly Cys Leu Val Lys Asp Tyr Phe Pro Glu145 150 155 160Pro Val
Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser Gly Val His 165 170
175Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser
Ser
180 185 190Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr Tyr
Ile Cys 195 200 205Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp
Lys Lys Val Glu 210 215 220Pro Lys Ser Cys Asp Lys Thr His Lys Ala
Ser Gly Gly Arg His Arg225 230 235 240Gln Pro Arg Gly Trp Glu Gln
Leu Gly Gly Gly Gly Gly Ser Pro Thr 245 250 255Gly Ala Glu Phe Leu
Gly Asp Gly Gly Asp Val Ser Phe Ser Thr Arg 260 265 270Gly Thr Gln
Asn Trp Thr Val Glu Arg Leu Leu Gln Ala His Ala Gln 275 280 285Leu
Glu Glu Arg Gly Tyr Val Phe Val Gly Tyr His Gly Thr Phe Leu 290 295
300Glu Ala Ala Gln Ser Ile Val Phe Gly Gly Val Ala Ala Arg Ser
Gln305 310 315 320Asp Leu Ala Ala Ile Trp Ala Gly Phe Tyr Ile Ala
Gly Asp Pro Ala 325 330 335Leu Ala Tyr Gly Tyr Ala Gln Asp Gln Glu
Pro Asp Ala Ala Gly Arg 340 345 350Ile Arg Asn Gly Ala Leu Leu Arg
Val Tyr Val Pro Ala Ser Ser Leu 355 360 365Pro Gly Phe Tyr Arg Thr
Ser Leu Thr Leu Ala Ala Pro Glu Ala Ala 370 375 380Gly Glu Val Glu
Arg Leu Ile Gly His Pro Leu Pro Leu Ala Leu Asp385 390 395 400Ala
Ile Thr Gly Pro Glu Glu Glu Gly Gly Arg Leu Glu Thr Ile Leu 405 410
415Gly Trp Pro Leu Ala Glu Arg Thr Val Val Ile Pro Ser Ala Ile Pro
420 425 430Thr Asp Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser
Ile Pro 435 440 445Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr
Ala Ser Gln Pro 450 455 460Gly Lys Pro Pro Arg Glu Asp Leu Lys465
470292473PRTArtificial SequenceSynthetic 292Met Gln Val Gln Leu Val
Gln Ser Gly Ala Glu Val Lys Lys Pro Gly1 5 10 15Ala Ser Val Lys Val
Ser Cys Lys Thr Ser Arg Tyr Thr Phe Thr Glu 20 25 30Tyr Thr Ile His
Trp Val Arg Gln Ala Pro Gly Gln Arg Leu Glu Trp 35 40 45Ile Gly Gly
Ile Asn Pro Asn Asn Gly Ile Pro Asn Tyr Asn Gln Lys 50 55 60Phe Lys
Gly Arg Val Thr Ile Thr Val Asp Thr Ser Ala Ser Thr Ala65 70 75
80Tyr Met Glu Leu Ser Ser Leu Arg Ser Glu Asp Thr Ala Val Tyr Tyr
85 90 95Cys Ala Arg Arg Arg Ile Ala Tyr Gly Tyr Asp Glu Gly His Ala
Met 100 105 110Asp Tyr Trp Gly Gln Gly Thr Leu Val Thr Val Ser Ser
Ala Ser Thr 115 120 125Lys Gly Pro Ser Val Phe Pro Leu Ala Pro Ser
Ser Lys Ser Thr Ser 130 135 140Gly Gly Thr Ala Ala Leu Gly Cys Leu
Val Lys Asp Tyr Phe Pro Glu145 150 155 160Pro Val Thr Val Ser Trp
Asn Ser Gly Ala Leu Thr Ser Gly Val His 165 170 175Thr Phe Pro Ala
Val Leu Gln Ser Ser Gly Leu Tyr Ser Leu Ser Ser 180 185 190Val Val
Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr Tyr Ile Cys 195 200
205Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys Lys Val Glu
210 215 220Pro Lys Ser Cys Asp Lys Thr His Lys Ala Ser Gly Gly Arg
His Arg225 230 235 240Gln Pro Arg Gly Trp Glu Gln Leu Gly Gly Gly
Gly Gly Ser Pro Thr 245 250 255Gly Ala Glu Phe Leu Gly Asp Gly Gly
Asp Val Ser Phe Ser Thr Arg 260 265 270Gly Thr Gln Asn Trp Thr Val
Glu Arg Leu Leu Gln Ala His Ala Gln 275 280 285Leu Glu Glu Arg Gly
Tyr Val Phe Val Gly Tyr His Gly Thr Ala Leu 290 295 300Glu Ala Ala
Gln Ser Ile Val Phe Gly Gly Val Arg Ala Arg Ser Gln305 310 315
320Asp Leu Asp Ala Ile Trp Arg Gly Phe Tyr Ile Ala Gly Asp Pro Ala
325 330 335His Ala Tyr Gly Tyr Ala Gln Asp Gln Glu Pro Asp Ala Arg
Gly Arg 340 345 350Ile Ala Asn Gly Ala Leu Leu Arg Val Tyr Val Pro
Ala Ser Ser Leu 355 360 365Pro Gly Phe Tyr Arg Thr Ser Leu Thr Leu
Ala Ala Pro Glu Ala Ala 370 375 380Gly Glu Val Glu Arg Leu Ile Gly
His Pro Leu Pro Leu Arg Leu Asp385 390 395 400Ala Ile Thr Gly Pro
Glu Glu Glu Gly Gly Arg Glu Glu Thr Ile Leu 405 410 415Gly Trp Pro
Leu Ala Glu Arg Thr Val Val Ile Pro Ser Ala Ile Pro 420 425 430Thr
Asp Pro Arg Asn Val Gly Gly Asp Leu Asp Pro Ser Ser Ile Pro 435 440
445Asp Lys Glu Gln Ala Ile Ser Ala Leu Pro Asp Tyr Ala Ser Gln Pro
450 455 460Gly Lys Pro Pro Arg Glu Asp Leu Lys465
470293221PRTArtificial SequenceSynthetic 293Met Asp Ile Val Met Thr
Gln Ser Pro Asp Ser Leu Ala Val Ser Leu1 5 10 15Gly Glu Arg Ala Thr
Ile Asn Cys Lys Ser Ser Gln Ser Leu Leu Tyr 20 25 30Ser Arg Asn Gln
Lys Asn Tyr Leu Ala Trp Tyr Gln Gln Lys Pro Gly 35 40 45Gln Pro Pro
Lys Leu Leu Ile Phe Trp Ala Ser Thr Arg Glu Ser Gly 50 55 60Val Pro
Asp Arg Phe Ser Gly Ser Gly Phe Gly Thr Asp Phe Thr Leu65 70 75
80Thr Ile Ser Ser Leu Gln Ala Glu Asp Val Ala Val Tyr Tyr Cys Gln
85 90 95Gln Tyr Phe Ser Tyr Pro Leu Thr Phe Gly Gln Gly Thr Lys Val
Glu 100 105 110Ile Lys Arg Thr Val Ala Ala Pro Ser Val Phe Ile Phe
Pro Pro Ser 115 120 125Asp Glu Gln Leu Lys Ser Gly Thr Ala Ser Val
Val Cys Leu Leu Asn 130 135 140Asn Phe Tyr Pro Arg Glu Ala Lys Val
Gln Trp Lys Val Asp Asn Ala145 150 155 160Leu Gln Ser Gly Asn Ser
Gln Glu Ser Val Thr Glu Gln Asp Ser Lys 165 170 175Asp Ser Thr Tyr
Ser Leu Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp 180 185 190Tyr Glu
Lys His Lys Val Tyr Ala Cys Glu Val Thr His Gln Gly Leu 195 200
205Ser Ser Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 210 215
220294221PRTArtificial SequenceSynthetic 294Met Asp Ile Val Leu Thr
Gln Ser Pro Asp Ser Leu Ala Val Ser Leu1 5 10 15Gly Glu Arg Ala Thr
Ile Asn Cys Lys Ser Ser Gln Ser Leu Leu Tyr 20 25 30Ser Arg Asn Gln
Lys Asn Tyr Leu Ala Trp Tyr Gln Gln Lys Pro Gly 35 40 45Gln Pro Pro
Lys Leu Leu Ile Phe Trp Ala Ser Thr Arg Glu Ser Gly 50 55 60Val Pro
Asp Arg Phe Ser Gly Ser Gly Phe Gly Thr Asp Phe Thr Leu65 70 75
80Thr Ile Ser Ser Leu Gln Ala Glu Asp Val Ala Val Tyr Tyr Cys Gln
85 90 95Gln Tyr Phe Ser Tyr Pro Leu Thr Phe Gly Gln Gly Thr Lys Val
Glu 100 105 110Ile Lys Arg Thr Val Ala Ala Pro Ser Val Phe Ile Phe
Pro Pro Ser 115 120 125Asp Glu Gln Leu Lys Ser Gly Thr Ala Ser Val
Val Cys Leu Leu Asn 130 135 140Asn Phe Tyr Pro Arg Glu Ala Lys Val
Gln Trp Lys Val Asp Asn Ala145 150 155 160Leu Gln Ser Gly Asn Ser
Gln Glu Ser Val Thr Glu Gln Asp Ser Lys 165 170 175Asp Ser Thr Tyr
Ser Leu Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp 180 185 190Tyr Glu
Lys His Lys Val Tyr Ala Cys Glu Val Thr His Gln Gly Leu 195 200
205Ser Ser Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 210 215
220295464PRTArtificial SequenceSynthetic 295Met Asp Val Lys Leu Val
Glu Ser Gly Gly Gly Leu Val Lys Leu Gly1 5 10 15Gly Ser Leu Lys Leu
Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn 20 25 30Tyr Tyr Met Ser
Trp Val Arg Gln Thr Pro Glu Lys Arg Leu Glu Leu 35 40 45Val Ala Ala
Ile Asn Ser Asp Gly Gly Ile Thr Tyr Tyr Leu Asp Thr 50 55 60Val Lys
Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn Thr Leu65 70 75
80Tyr Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr Ala Leu Phe Tyr
85 90 95Cys Ala Arg His Arg Ser Gly Tyr Phe Ser Met Asp Tyr Trp Gly
Gln 100 105 110Gly Thr Ser 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 Lys
210 215 220Ala Ser Gly Gly Arg His Arg Gln Pro Arg Gly Trp Glu Gln
Leu Gly225 230 235 240Gly Gly Gly Gly Ser Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly 245 250 255Asp Val Ser Phe Ser Thr Arg Gly Thr
Gln Asn Trp Thr Val Glu Arg 260 265 270Leu Leu Gln Ala His Ala Gln
Leu Glu Glu Arg Gly Tyr Val Phe Val 275 280 285Gly Tyr His Gly Thr
Phe Leu Glu Ala Ala Gln Ser Ile Val Phe Gly 290 295 300Gly Val Ala
Ala Arg Ser Gln Asp Leu Ala Ala Ile Trp Ala Gly Phe305 310 315
320Tyr Ile Ala Gly Asp Pro Ala Leu Ala Tyr Gly Tyr Ala Gln Asp Gln
325 330 335Glu Pro Asp Ala Ala Gly Arg Ile Arg Asn Gly Ala Leu Leu
Arg Val 340 345 350Tyr Val Pro Ala Ser Ser Leu Pro Gly Phe Tyr Arg
Thr Ser Leu Thr 355 360 365Leu Ala Ala Pro Glu Ala Ala Gly Glu Val
Glu Arg Leu Ile Gly His 370 375 380Pro Leu Pro Leu Ala Leu Asp Ala
Ile Thr Gly Pro Glu Glu Glu Gly385 390 395 400Gly Arg Leu Glu Thr
Ile Leu Gly Trp Pro Leu Ala Glu Arg Thr Val 405 410 415Val Ile Pro
Ser Ala Ile Pro Thr Asp Pro Arg Asn Val Gly Gly Asp 420 425 430Leu
Asp Pro Ser Ser Ile Pro Asp Lys Glu Gln Ala Ile Ser Ala Leu 435 440
445Pro Asp Tyr Ala Ser Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys
450 455 460296464PRTArtificial SequenceSynthetic 296Met Asp Val Lys
Leu Val Glu Ser Gly Gly Gly Leu Val Lys Leu Gly1 5 10 15Gly Ser Leu
Lys Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn 20 25 30Tyr Tyr
Met Ser Trp Val Arg Gln Thr Pro Glu Lys Arg Leu Glu Leu 35 40 45Val
Ala Ala Ile Asn Ser Asp Gly Gly Ile Thr Tyr Tyr Leu Asp Thr 50 55
60Val Lys Gly Arg Phe Thr Ile Ser Arg Asp Asn Ala Lys Asn Thr Leu65
70 75 80Tyr Leu Gln Met Ser Ser Leu Lys Ser Glu Asp Thr Ala Leu Phe
Tyr 85 90 95Cys Ala Arg His Arg Ser Gly Tyr Phe Ser Met Asp Tyr Trp
Gly Gln 100 105 110Gly Thr Ser 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 Lys
210 215 220Ala Ser Gly Gly Arg His Arg Gln Pro Arg Gly Trp Glu Gln
Leu Gly225 230 235 240Gly Gly Gly Gly Ser Pro Thr Gly Ala Glu Phe
Leu Gly Asp Gly Gly 245 250 255Asp Val Ser Phe Ser Thr Arg Gly Thr
Gln Asn Trp Thr Val Glu Arg 260 265 270Leu Leu Gln Ala His Ala Gln
Leu Glu Glu Arg Gly Tyr Val Phe Val 275 280 285Gly Tyr His Gly Thr
Ala Leu Glu Ala Ala Gln Ser Ile Val Phe Gly 290 295 300Gly Val Arg
Ala Arg Ser Gln Asp Leu Asp Ala Ile Trp Arg Gly Phe305 310 315
320Tyr Ile Ala Gly Asp Pro Ala His Ala Tyr Gly Tyr Ala Gln Asp Gln
325 330 335Glu Pro Asp Ala Arg Gly Arg Ile Ala Asn Gly Ala Leu Leu
Arg Val 340 345 350Tyr Val Pro Ala Ser Ser Leu Pro Gly Phe Tyr Arg
Thr Ser Leu Thr 355 360 365Leu Ala Ala Pro Glu Ala Ala Gly Glu Val
Glu Arg Leu Ile Gly His 370 375 380Pro Leu Pro Leu Arg Leu Asp Ala
Ile Thr Gly Pro Glu Glu Glu Gly385 390 395 400Gly Arg Glu Glu Thr
Ile Leu Gly Trp Pro Leu Ala Glu Arg Thr Val 405 410 415Val Ile Pro
Ser Ala Ile Pro Thr Asp Pro Arg Asn Val Gly Gly Asp 420 425 430Leu
Asp Pro Ser Ser Ile Pro Asp Lys Glu Gln Ala Ile Ser Ala Leu 435 440
445Pro Asp Tyr Ala Ser Gln Pro Gly Lys Pro Pro Arg Glu Asp Leu Lys
450 455 460297215PRTArtificial SequenceSynthetic 297Met Asp Ile Val
Met Thr Gln Ser Gln Arg Phe Met Ser Thr Thr Val1 5 10 15Gly Asp Arg
Val Ser Ile Thr Cys Lys Ala Ser Gln Asn Val Val Ser 20 25 30Ala Val
Ala Trp Tyr Gln Gln Lys Pro Gly Gln Ser Pro Lys Leu Leu 35 40 45Ile
Tyr Ser Ala Ser Asn Arg Tyr Thr Gly Val Pro Asp Arg Phe Thr 50 55
60Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Asn Met Gln65
70 75 80Ser Glu Asp Leu Ala Asp Phe Phe Cys Gln Gln Tyr Ser Asn Tyr
Pro 85 90 95Trp Thr Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys Arg Thr
Val Ala 100 105 110Ala Pro Ser Val Phe Ile Phe Pro Pro Ser Asp Glu
Gln Leu Lys Ser 115 120 125Gly Thr Ala Ser Val Val Cys Leu Leu Asn
Asn Phe Tyr Pro Arg Glu 130 135 140Ala Lys Val Gln Trp Lys Val Asp
Asn Ala Leu Gln Ser Gly Asn Ser145 150 155 160Gln Glu Ser Val Thr
Glu Gln Asp Ser Lys Asp Ser Thr Tyr Ser Leu 165 170 175Ser Ser Thr
Leu Thr Leu Ser Lys Ala Asp Tyr Glu Lys His Lys Val 180 185 190Tyr
Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser Pro Val Thr Lys 195 200
205Ser Phe Asn Arg Gly Glu Cys 210 215
* * * * *