U.S. patent application number 16/672330 was filed with the patent office on 2020-05-07 for antibody formulations and methods.
This patent application is currently assigned to PROTHENA BIOSCIENCES LIMITED. The applicant listed for this patent is PROTHENA BIOSCIENCES LIMITED. Invention is credited to Patrick Garidel, Michael Grundman, Andreas Langer.
Application Number | 20200140534 16/672330 |
Document ID | / |
Family ID | 51355583 |
Filed Date | 2020-05-07 |
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United States Patent
Application |
20200140534 |
Kind Code |
A1 |
Garidel; Patrick ; et
al. |
May 7, 2020 |
ANTIBODY FORMULATIONS AND METHODS
Abstract
The invention provides antibody formulations and methods useful
for prophylaxis or treatment of synucleinopathies, including
Parkinson's disease.
Inventors: |
Garidel; Patrick;
(Norderstedt, DE) ; Langer; Andreas; (Maselheim,
DE) ; Grundman; Michael; (San Diego, CA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
PROTHENA BIOSCIENCES LIMITED |
Dublin 2 |
|
IE |
|
|
Assignee: |
PROTHENA BIOSCIENCES
LIMITED
Dublin 2
IE
|
Family ID: |
51355583 |
Appl. No.: |
16/672330 |
Filed: |
November 1, 2019 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14322797 |
Jul 2, 2014 |
10513555 |
|
|
16672330 |
|
|
|
|
61843011 |
Jul 4, 2013 |
|
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|
61979886 |
Apr 15, 2014 |
|
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
A61K 39/3955 20130101;
A61P 25/02 20180101; A61K 45/06 20130101; C07K 2317/76 20130101;
A61P 25/28 20180101; A61P 25/16 20180101; A61K 9/19 20130101; C07K
16/18 20130101; C07K 2317/24 20130101; A61K 47/26 20130101; A61K
39/39591 20130101; A61P 43/00 20180101 |
International
Class: |
C07K 16/18 20060101
C07K016/18; A61K 39/395 20060101 A61K039/395; A61K 45/06 20060101
A61K045/06 |
Claims
1-48. (canceled)
49. A method of purifying a humanized, veneered, or chimeric 9E4
antibody expressed from CHO cells, comprising: (a) performing
protein-A solid phase chromatography, wherein the 9E4 antibody
preferentially binds the solid phase relative to impurities; (b)
performing anion-exchange solid phase chromatography, wherein the
9E4 antibody preferentially elutes from the solid phase relative to
impurities; (c) performing cation-exchange solid phase
chromatograph, wherein the 9E4 antibody preferentially binds to the
solid phase relative to impurities; (d) performing a viral
inactivation and/or removal step; (e) performing a filtration step;
and (f) performing a concentration and resuspension step.
50. The method of claim 49, wherein the protein-A, anion-exchange
and cation exchange steps are performed in that order.
51. The method of claim 50, wherein a viral inactivation step is
performed between steps (a) and (b) and a viral removal step is
performed after step (c).
52. The method of claim 51, wherein a filtration step is performed
between the viral inactivation step and the anion exchange step and
after the cation exchange step.
53. A method of purifying a humanized, veneered, or chimeric 9E4
antibody expressed from CHO cells, comprising: (a) loading culture
medium from the cells expressing the 9E4 antibody on to a protein A
column, wherein humanized 9E4 binds to the column, and reducing the
pH to elute a fraction containing the 9E4 antibody; (b) incubating
the fraction from step (a) under acidic conditions to inactivate
viruses; (c) subjecting the fraction after step (b) to depth
filtration to reduce particles; (d) subjecting the filtrate
obtained from step (c) containing the 9E4 antibody to anion
exchange solid phase chromatography, wherein impurities in the
fraction bind to the column and the 9E4 antibody elutes through the
column; (e) subjecting a fraction from step (d) containing the 9E4
antibody to cation exchange solid phase chromatography wherein the
9E4 antibody binds to the column and is eluted by raising the salt
concentration; (f) subjecting a fraction from step (e) containing
the 9E4 antibody to viral filtration; and (g) subjecting the
filtrate containing 9E4 antibody from step (f) to
ultra/diafiltration to concentrate and resuspend the 9E4
antibody.
54. The method of claim 53, wherein the anion exchange column is
Q-Sepharose fast flow resin.
55. The method of claim 53, wherein in step (a) the pH is reduced
from 6-8 to 2.5-3.5
56. The method of claim 53, wherein step (b) is performed at
pH3.5.
57. The method of claim 53, wherein the filter in step (f) is a 0.1
micron filter.
58-64. (canceled)
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of U.S. application Ser.
No. 14/322,797 filed Jul. 2, 2014, which claims the benefit of U.S.
Provisional Patent Application No. 61/843,011, filed Jul. 4, 2013,
and U.S. Provisional Patent Application No. 61/979,886, filed Apr.
15, 2014, each of which is incorporated by reference in its
entirety for all purposes.
REFERENCE TO A SEQUENCE LISTING
[0002] The Sequence Listing written in file 538728SEQLIST.txt,
created on Nov. 1, 2019, for "Antibody Formulations and Methods" is
38,942 bytes. The information contained in this file is hereby
incorporated by reference.
BACKGROUND
[0003] Synucleinopathies, also known as Lewy body diseases (LBDs),
are characterized by degeneration of the dopaminergic system, motor
alterations, cognitive impairment, and formation of Lewy bodies
(LBs) and/or Lewy neurites. (McKeith et al., Neurology (1996)
47:1113-24). Synucleinopathies include Parkinson's disease
(including idiopathic Parkinson's disease), Diffuse Lewy Body
Disease (DLBD) also known as Dementia with Lewy Bodies (DLB), Lewy
body variant of Alzheimer's disease (LBV), Combined Alzheimer's and
Parkinson disease, pure autonomic failure and multiple system
atrophy (MSA; e.g., Olivopontocerebellar Atrophy, Striatonigral
Degeneration and Shy-Drager Syndrome). Several nonmotor signs and
symptoms are thought to be harbingers for synucleinopathies in the
prodromal phase of the diseases (i.e., the presymptomatic,
subclinical, preclinical, or premotor period). Such early signs
include, for example, REM sleep behavior disorder (RBD), loss of
smell and constipation (Mahowald et al., Neurology (2010)
75:488-489). Lewy body diseases continue to be a common cause for
movement disorders and cognitive deterioration in the aging
population (Galasko et al., Arch. Neurol. (1994) 51:888-95).
[0004] Alpha-synuclein is part of a large family of proteins
including beta- and gamma-synuclein and synoretin. Alpha-synuclein
is expressed in the normal state associated with synapses and is
believed to play a role in neural plasticity, learning and memory.
Several studies have implicated alpha-synuclein with a central role
in PD pathogenesis. The protein can aggregate to form insoluble
fibrils in pathological conditions. For example, synuclein
accumulates in LBs (Spillantini et al., Nature (1997) 388:839-40;
Takeda et al., J. Pathol. (1998) 152:367-72; Wakabayashi et al.,
Neurosci. Lett. (1997) 239:45-8). Mutations in the alpha-synuclein
gene co-segregate with rare familial forms of parkinsonism (Kruger
et al., Nature Gen. (1998) 18:106-8; Polymeropoulos, et al.,
Science (1997) 276:2045-7). Over expression of alpha synuclein in
transgenic mice (Masliah et al., Science (2000) 287:1265-9) and
Drosophila (Feany et al., Nature (2000) 404:394-8) mimics several
pathological aspects of Lewy body disease. In addition, it has been
suggested that soluble oligomers of synuclein may be neurotoxic
(Conway K A, et al., Proc Natl Acad Sci USA (2000) 97:571-576;
Volles M J, Lansbury P T, Jr Biochemistry (2003) 42:7871-7878). The
accumulation of alpha-synuclein with similar morphological and
neurological alterations in species and animal models as diverse as
humans, mice, and flies suggests that this molecule contributes to
the development of Lewy body disease.
SUMMARY OF THE CLAIMED INVENTION
[0005] The present invention provides antibody formulations useful
for prophylaxis and treatment of synucleinopathy. The invention
provides pharmaceutical formulations comprising (a) a chimeric,
veneered, or humanized version of antibody 9E4 (ATCC Accession
Number PTA-8221), or fragment thereof which specifically competes
for binding with 9E4, and/or which is directed to an epitope within
amino acid residues 118-126 of alpha-synuclein, wherein the
antibody is present at a concentration within the range from about
1 mg/mL to about 100 mg/mL; (b) citrate buffer present at a
concentration within the range from about 10 mM to about 30 mM; (c)
trehalose present at a concentration within the range from about
210 mM to about 250 mM; and (d) polysorbate 20 present at a
concentration within the range from about 0.005% to about 0.05% by
weight; wherein the formulation is characterized by a pH within the
range from about 5.5 to about 7. Some formulations, for example,
comprise an antibody comprising a mature humanized heavy chain
variable region at least 90% identical to SEQ ID NO:11 and
comprising the three Kabat CDRs of SEQ ID NO:11, and a humanized
light chain at least 90% identical to SEQ ID NO:4 and comprising
the three Kabat CDRs of SEQ ID NO:4.
[0006] In some formulations of the invention, the antibody is
present at a concentration within the range from about 5-100 mg/ml,
e.g., 5 mg/mL to about 15 mg/mL (e.g., about 10 mg/mL), or present
at a concentration within the range from about 25-75 mg/mL (e.g.,
about 50 mg/mL). In some formulations of the invention, the
antibody is present at a concentration within the range from about
36 mg/mL to about 44 mg/mL (e.g., about 40 mg/mL).
[0007] In some formulations of the invention, citrate buffer is
present at a concentration of about 20 mM.
[0008] In some formulations of the invention, trehalose is present
at a concentration of about 230 mM.
[0009] Prepared as described herein, some representative
formulations of the invention (a) are characterized by an
osmolality of about 335 mOsm/kg; (b) comprise less than about 10%
of the antibody present as an aggregate in the formulation; (c)
further comprise a bulking agent; (d) are sterile; and/or (e) are
stable on freezing and thawing. Prepared as described herein, some
representative formulations of the invention (a) are characterized
by an osmolality of about 295 mOsm/kg to about 375 mOsm/kg; (b)
comprise less than about 10% or less than about 5% of the antibody
present as an aggregate in the formulation; (c) further comprise a
bulking agent; (d) are sterile; and/or (e) are stable on freezing
and thawing.
[0010] In one aspect of the invention, a formulation comprises (a)
an antibody comprising a light chain having an amino acid sequence
comprising SEQ ID NO: 29 and a heavy chain having an amino acid
sequence comprising SEQ ID NO: 31 or 32, with or without C-terminal
lysines, wherein the antibody is present at a concentration of
about 40 mg/mL; (b) a citrate buffer present at a concentration of
about 20 mM; (c) trehalose present at a concentration of about 230
mM; (d) polysorbate 20 present at a concentration of about 0.2 g/L;
and (e) a pH of about 6.0.
[0011] The pharmaceutical formulation can comprise (a) an antibody,
which is antibody 9E4 (ATCC Accession Number PTA-8221) or a
chimeric, veneered, or humanized version of antibody 9E4, a
fragment thereof which specifically competes for binding with 9E4,
and/or a chimeric, veneered, humanized, or human antibody which is
directed to an epitope within amino acid residues 118-126 of
alpha-synuclein, wherein the antibody is present at a concentration
within the range from about 1 mg/mL to about 100 mg/mL; (b) a
buffer; (c) a sugar and/or polyol; and (d) a surfactant. In
particular examples, the antibody of the disclosed formulations
comprises a light chain having an amino acid sequence comprising
SEQ ID NO: 29 and a heavy chain having an amino acid sequence
comprising SEQ ID NO: 32 with or without the C-terminal lysine.
[0012] The antibody formulations can be lyophilized. For example, a
representative lyophilized formulation can comprise: (a) a
humanized version of antibody 9E4 (ATCC Accession Number PTA-8221)
or antigen binding fragment thereof; (b) histidine, citrate, or
succinate; (c) trehalose, sucrose, or a mixture of sucrose and
mannitol; and (d) polysorbate 20. Lyophilized formulations can have
a pH of between about 6 to about 7 when reconstituted, such as pH
6.0 or 6.5 when reconstituted. Lyophilized formulations typically
comprise about 40 mg to about 1000 mg of the antibody. Lyophilized
formulations typically comprise polysorbate 20 at a concentration
within the range from about 0.005% to about 0.05% by weight.
Following reconstitution, the lyophilized formulations yield an
aqueous solution. For example, the reconstituted aqueous solution
can comprise: (a) a humanized version of antibody 9E4 (e.g., an
antibody comprising a light chain having an amino acid sequence
comprising SEQ ID NO: 29 and a heavy chain having an amino acid
sequence comprising any one of SEQ ID NO: 31 or 32, with or without
the C-terminal lysine) which is present at a concentration of about
40 mg/mL; (b) a citrate buffer present at a concentration of about
20 mM; (c) trehalose present at a concentration of about 230 mM;
(d) polysorbate 20 present at a concentration of about 0.2 g/L; and
(e) a pH of about 6.0. A representative lyophilized formulation
comprises about 200 mg of the antibody.
[0013] Also provided are nucleic acids encoding antibodies used to
prepare the disclosed formulations. For example, such nucleic acids
include nucleic acids comprising nucleotide sequences encoding an
antibody light chain of SEQ ID NO: 29, and nucleic acids comprising
nucleotide sequences encoding an antibody heavy chain of SEQ ID NO:
32. For example, the nucleotide sequence set forth as SEQ ID NO: 17
encodes the humanized 9E4 light chain variable region component of
SEQ ID NO: 29. As another example, the nucleotide sequence set
forth as SEQ ID NO: 20 encodes the humanized 9E4 heavy chain
variable region component of SEQ ID NO: 32.
[0014] For the production of antibodies, the disclosed nucleic
acids may be included in a vector, either singly or in combination
(e.g., a combination of a nucleic acid encoding a humanized 9E4
light chain and a nucleic acid encoding a humanized 9E4 heavy
chain). For example, a vector can comprise a nucleic acid
comprising a nucleotide sequence encoding any one of SEQ ID NOs:
15-17; a nucleic acid comprising the nucleotide sequence of any one
of SEQ ID NOs: 18-20, or combinations thereof. Representative
vectors of the invention include (a) a vector comprising a nucleic
acid sequence encoding a humanized 9E4 light chain set forth as SEQ
ID NO: 29 and a humanized 9E4 heavy chain set forth as SEQ ID NO:
31; and (b) a vector comprising a nucleic acid encoding the amino
acid sequence of SEQ ID NO: 29 and a nucleic acid encoding the
amino acid sequence of SEQ ID NO: 32.
[0015] Also provided are host cells (e.g., CHO cells) having stably
incorporated into their genomes one or more of the nucleic acids
disclosed herein. For example, a host cell can comprise in its
genome a stably integrated nucleic acid comprising a nucleotide
sequence encoding any one of SEQ ID NOs: 15-17; a stably integrated
nucleic acid comprising the nucleotide sequence of any one of SEQ
ID NOs: 18-20, or combinations thereof. Representative host cells
of the invention include: (a) host cells comprising a nucleic acid
sequence encoding a humanized 9E4 light chain set forth as SEQ ID
NO: 29 and a humanized 9E4 heavy chain set forth as SEQ ID NO: 31;
and (b) host cells comprising a nucleic acid having the nucleotide
sequence of SEQ ID NO: 29 and a nucleic acid having the nucleotide
sequence of SEQ ID NO: 32.
[0016] The present invention also provides methods of preparing
pharmaceutical formulations. In one aspect of the invention, such a
method comprises: (a) culturing mammalian cells having stably
incorporated into their genome nucleic acids encoding the light and
heavy chains of a murine, chimeric, veneered or humanized 9E4
antibody so that the cells secrete the antibody into the cell
culture media, and purifying the antibody from the cell culture
media; and (b) preparing a formulation comprising (i) a chimeric,
veneered, or humanized version of antibody 9E4 (ATCC Accession
Number PTA-8221), or fragment thereof that specifically competes
for binding with 9E4, wherein the antibody is present at a
concentration within the range from about 10 mg/mL to about 50
mg/mL; (ii) citrate buffer present at a concentration within the
range from about 20 mM to about 30 mM; (iii) trehalose present at a
concentration within the range from about 210 mM to about 250 mM;
and (iv) polysorbate 20 present at a concentration within the range
from about 0.005% to about 0.05% by weight; wherein the formulation
is characterized by a pH within the range from about 5.5 to about
6.5. Mammalian cells useful for this purpose include: (a) host
cells having stably incorporated into their genomes a nucleic acid
sequence encoding a humanized 9E4 light chain set forth as SEQ ID
NO: 29 and a humanized 9E4 heavy chain set forth as SEQ ID NO: 31;
and (b) host cells having stably incorporated into their genomes a
nucleic acid having the nucleotide sequence of SEQ ID NO: 29 and a
nucleic acid having the nucleotide sequence of SEQ ID NO: 32. In
some aspects of the invention, the disclosed methods of preparing a
pharmaceutical formulation include the additional step of
evaluating at least one property of the antibody in the
formulation, such as physical stability, chemical stability, and/or
biological activity.
[0017] Further provided are methods of therapeutically or
prophylactically treating a human patient having or at risk for a
synucleinopathy, the method comprising administering to the patient
an effective dosage of a formulation of the invention. Some
patients amenable to treatment may have Parkinson's disease.
[0018] The disclosed therapeutic and prophylactic treatment methods
include combination therapies (i.e., administration of the
disclosed antibody formulations with one or more additional drug
substances) to thereby elicit synergistic results. The two or more
drug substances are administered simultaneously or sequentially, in
any order. For example, a formulation of the invention can be
administered prior to administration of a second drug substance,
concurrently with a second drug substance, or subsequent to
administration of a second drug substance. A formulation of the
invention can be administered concurrently or consecutively in
combination with, e.g., levodopa, benzaseride, carbidopa, dopamine
agonists, COMT inhibitors, MAO inhibitors, amantadine, or
anticholinergic agents.
[0019] In accordance with the disclosed therapeutic and
prophylactic treatment methods, formulations of the invention can
be administered in multiple dosages, for example, at a frequency in
a range of about daily to about annually, such as at a frequency in
a range of about every other week to about every three months, or
such as once a month or every four weeks. In one aspect, an
antibody formulation of the invention is administered intravenously
at a dose in a range from about 0.3 mg/kg to about 30 mg/kg drug
substance. Exemplary dosage regimes include about 0.3 mg/kg, about
1.0 mg/kg, about 3.0 mg/kg, about 10 mg/kg and about 30 mg/kg of
humanized 9E4 drug substance, administered intravenously as a
single dose or once every four weeks.
[0020] For example, a method of therapeutically or prophylactically
treating a human patient having or at risk for a synucleinopathy,
such as Parkinson's disease, can comprise administering to the
patient an effective dosage of a pharmaceutical formulation
comprising: (a) an antibody comprising a light chain having an
amino acid sequence comprising SEQ ID NO: 29 and a heavy chain
having an amino acid sequence comprising SEQ ID NO: 32, with or
without the C-terminal lysine, and which is present at a
concentration of about 40 mg/mL; (b) a citrate buffer present at a
concentration of about 20 mM; (c) trehalose present at a
concentration of about 230 mM; (d) polysorbate 20 present at a
concentration of about 0.2 g/L; and (e) a pH of about 6.0. In such
a method, the dosage is typically from about 0.3 mg/kg to about 30
mg/kg of the antibody (e.g., about 0.5 mg/kg to about 8 mg/kg, or
about 8 mg/kg to about 30 mg/kg) administered intravenously or
subcutaneously, at a frequency of from about weekly to about once
every 28 days, or about quarterly.
[0021] The present invention further provides a pharmaceutical
product comprising: (a) a vial comprising about 200 mg antibody in
powder form; (b) instructions for reconstitution of the antibody;
and (c) instructions for preparing the reconstituted antibody for
infusion, wherein for example, (i) the antibody comprises a light
chain having an amino acid sequence comprising SEQ ID NO: 29 and a
heavy chain having an amino acid sequence comprising SEQ ID NO: 32
with or without the C-terminal lysine; and (ii) the reconstitution
instructions require reconstitution with water for injection to an
extractable volume of about 5 mL.
BRIEF DESCRIPTION OF THE DRAWINGS
[0022] FIG. 1 is a DSC thermogram for humanized 9E4 antibody,
showing the energy flow (calories/.degree. C.) associated with
increasing or decreasing the temperature of a solution containing
1.5 mg/ml of humanized 9E4 antibody (version H3L3). The antibody
solution was heated and cooled sequentially, in the order shown in
the inset box. The lines are numbered to indicate which line is
associated with each of the five temperature transitions shown in
the inset box.
[0023] FIG. 2 is a graph depicting the transition temperatures for
humanized 9E4 antibody (version H3L3) as a function of pH. The
different symbols show the transition temperature as determined by
RALS, IF, and DSC. Two or three DSC transition temperatures were
observed at each pH, and each is presented with a distinct
symbol.
[0024] FIG. 3 is a bar graph depicting subvisible particle counts
(.gtoreq.2.0 mm, .gtoreq.10.0 mm, and .gtoreq.25.0 mm) for
formulations F1-F4 (as described in Table 10) following
lyophilization and reconstitution, with no storage period.
[0025] FIG. 4 is a bar graph depicting subvisible particle counts
(.gtoreq.2.0 mm, .gtoreq.10.0 mm, and .gtoreq.25.0 mm) for
formulations F1-F4 (as described in Table 10) following
lyophilization, storage at 40.degree. C. for one month, and
reconstitution.
[0026] FIG. 5 is a bar graph depicting subvisible particle counts
(.gtoreq.2.0 mm, .gtoreq.10.0 mm, and .gtoreq.25.0 mm) for
formulations F1-F4 (as described in Table 10) following
lyophilization, storage at 40.degree. C. for two months, and
reconstitution.
[0027] FIG. 6 is a bar graph depicting subvisible particle counts
(.gtoreq.2.0 mm, .gtoreq.10.0 mm, and .gtoreq.25.0 mm) for
formulations F1-F4 (as described in Table 10) following
lyophilization, storage at 40.degree. C. for three months, and
reconstitution.
[0028] FIG. 7 is a graph depicting the loss of monomeric humanized
9E4 antibody (version H3L3) as a function of formulation (F1-F4, as
described in Table 10) and time stored in lyophilized form at
40.degree. C.
BRIEF DESCRIPTION OF THE SEQUENCES
[0029] SEQ ID NO:1 is the amino acid sequence of the m9E4VL
variable region.
[0030] SEQ ID NO:2 is the amino acid sequence of the variable
region of the human VL acceptor sequence (NCBI accession code
AAY33350).
[0031] SEQ ID NO:3 is the amino acid sequence of the Hu9E4VLv1
variable region.
[0032] SEQ ID NO:4 is the amino acid sequence of the Hu9E4VLv2
variable region.
[0033] SEQ ID NO:5 is the amino acid sequence of the Hu9E4VLv3
variable region.
[0034] SEQ ID NO:6 is the amino acid sequence of the m9E4VH
variable region.
[0035] SEQ ID NO:7 is the amino acid sequence of the variable
region of the human VH acceptor sequence (NCBI accession code
AAC50998).
[0036] SEQ ID NO:8 is the amino acid sequence of the Hu9E4VHv1
variable region.
[0037] SEQ ID NO:9 is the amino acid sequence of the Hu9E4VHv2
variable region.
[0038] SEQ ID NO:10 is the amino acid sequence of the Hu9E4VHv3
variable region.
[0039] SEQ ID NO:11 is the amino acid sequence of the Hu9E4VHv4
variable region.
[0040] SEQ ID NO:12 is the amino acid sequence of wild-type human
alpha-synuclein.
[0041] SEQ ID NO:13 is the amino acid sequence of the humanized 9E4
light chain constant region, with Arginine at the N-terminus.
[0042] SEQ ID NO:14 is the amino acid sequence of the humanized 9E4
heavy chain constant region.
[0043] SEQ ID NO:15 is the nucleotide sequence encoding the
Hu9E4VLv1 variable region.
[0044] SEQ ID NO:16 is the nucleotide sequence encoding the
Hu9E4VLv2 variable region.
[0045] SEQ ID NO:17 is the nucleotide sequence encoding the
Hu9E4VLv3 variable region.
[0046] SEQ ID NO:18 is the nucleotide sequence encoding the
Hu9E4VHv1 variable region.
[0047] SEQ ID NO:19 is the nucleotide sequence encoding the
Hu9E4VHv2 variable region.
[0048] SEQ ID NO:20 is the nucleotide sequence encoding the
Hu9E4VHv3 variable region.
[0049] SEQ ID NO:21 is the nucleotide sequence encoding the
Hu9E4VHv4 variable region.
[0050] SEQ ID NO:22 is the amino acid sequence of the Hu9E4VL
signal peptide.
[0051] SEQ ID NO:23 is the nucleotide sequence encoding the Hu9E4VL
signal peptide.
[0052] SEQ ID NO:24 is the amino acid sequence of the Hu9E4VH
signal peptide.
[0053] SEQ ID NO:25 is the nucleotide sequence encoding the Hu9E4VH
signal peptide.
[0054] SEQ ID NO:26 is the Hu9E4VL consensus amino acid
sequence.
[0055] SEQ ID NO:27 is the Hu9E4VH consensus amino acid
sequence.
[0056] SEQ ID NO:28 is the amino acid sequence of the humanized 9E4
light chain constant region, without the Arginine at the
N-terminus.
[0057] SEQ ID NO:29 is the amino acid sequence of the humanized 9E4
light chain comprising (a) a variable region (version 3), and (b) a
constant region with Arginine at the N-terminus.
[0058] SEQ ID NO:30 is the amino acid sequence of the humanized 9E4
light chain comprising (a) a variable region (version 3), and (b) a
constant region without the Arginine at the N-terminus.
[0059] SEQ ID NO:31 is the amino acid sequence of the humanized 9E4
heavy chain comprising (a) a variable region (version 3), and (b) a
constant region.
[0060] SEQ ID NO:32 is the amino acid sequence of the humanized 9E4
heavy chain comprising (a) a variable region (version 3), and (b) a
BIP version heavy chain G1m3 allotype constant region.
[0061] SEQ ID NO:33 is the amino acid sequence of the BIP version
heavy chain G1m3 allotype constant region.
Definitions
[0062] The term "antibody" includes intact antibodies and binding
fragments thereof. Typically, fragments compete with the intact
antibody from which they were derived for specific binding to the
target. Fragments include separate heavy chains, separate light
chains, Fab, Fab', F(ab')2, F(ab)c, Fv, single chain antibodies,
and single domain antibodies. The term "antibody" also includes a
bispecific antibody. A bispecific or bifunctional antibody is an
artificial hybrid antibody having two different heavy/light chain
pairs and two different binding sites (see, e.g., Songsivilai and
Lachmann, Clin. Exp. Immunol., 79:315-321 (1990); Kostelny et al.,
J. Immunol., 148:1547-53 (1992)).
[0063] The basic antibody structural unit is a tetramer of
subunits. Each tetramer includes two identical pairs of polypeptide
chains, each pair having one "light" chain (about 25 kDa) and one
"heavy" chain (about 50-70 kDa). The amino-terminal portion of each
chain includes a variable region of about 100 to 110 or more amino
acids primarily responsible for antigen recognition. When initially
expressed, this variable region is typically linked to a cleavable
signal peptide. The variable region without the signal peptide is
sometimes referred to as a mature variable region. Thus, for
example, a light chain mature variable region means a light chain
variable region without the light chain signal peptide. The
carboxy-terminal portion of each chain defines a constant region
primarily responsible for effector function. A constant region can
include any or all of a CH1 region, hinge region, CH2 region, and
CH3 region.
[0064] Light chains are classified as either kappa or lambda. Heavy
chains are classified as gamma, mu, alpha, delta, or epsilon, and
define the antibody's isotype as IgG, IgM, IgA, IgD and IgE,
respectively. Within light and heavy chains, the variable and
constant regions are joined by a "J" region of about 12 or more
amino acids, with the heavy chain also including a "D" region of
about 10 or more amino acids. (See generally, Fundamental
Immunology (Paul, W., ed., 2nd ed. Raven Press, N.Y., 1989), Ch. 7)
(incorporated by reference in its entirety for all purposes).
[0065] The mature variable regions of each light/heavy chain pair
form the antibody binding site. Thus, an intact antibody has two
binding sites. Except for bifunctional or bispecific antibodies,
the two binding sites are the same. The chains all exhibit the same
general structure of relatively conserved framework regions (FR)
joined by three hypervariable regions, also called complementarity
determining regions or CDRs. The CDRs from the two chains of each
pair are aligned by the framework regions, enabling binding to a
specific epitope. From N-terminal to C-terminal, both light and
heavy chains comprise the regions FR1, CDR1, FR2, CDR2, FR3, CDR3
and FR4. The assignment of amino acids to each region is in
accordance with the definitions of Kabat, Sequences of Proteins of
Immunological Interest (National Institutes of Health, Bethesda,
Md., 1987 and 1991), or Chothia & Lesk, J. Mol. Biol.
196:901-917 (1987); Chothia et al., Nature 342:878-883 (1989).
Kabat also provides a widely used numbering convention (Kabat
numbering) in which corresponding residues between different heavy
chains or between different light chains are assigned the same
number.
[0066] Percentage sequence identities are determined with antibody
sequences maximally aligned by the Kabat numbering convention.
After alignment, if a subject antibody region (e.g., the entire
mature variable region of a heavy or light chain) is being compared
with the same region of a reference antibody, the percentage
sequence identity between the subject and reference antibody
regions is the number of positions occupied by the same amino acid
in both the subject and reference antibody region divided by the
total number of aligned positions of the two regions (with gaps not
counted) multiplied by 100 to convert to percentage.
[0067] For purposes of classifying amino acids substitutions as
conservative or non-conservative, amino acids are grouped as
follows: Group I (hydrophobic sidechains): Norleucine, Met, Ala,
Val, Leu, Ile; Group II (neutral hydrophilic side chains): Cys,
Ser, Thr; Group III (acidic side chains): Asp, Glu; Group IV (basic
side chains): Asn, Gln, His, Lys, Arg; Group V (residues
influencing chain orientation): Gly, Pro; and Group VI (aromatic
side chains): Trp, Tyr, Phe. Conservative substitutions involve
substitutions between amino acids in the same class.
[0068] Non-conservative substitutions constitute exchanging a
member of one of these classes for a member of another.
[0069] Antibodies of the invention typically bind to their
designated target with an affinity constant of at least 10.sup.6,
10.sup.7, 10.sup.8, 10.sup.9, or 10.sup.10 M.sup.-1. Such binding
is specific binding in that it is detectably higher in magnitude
and distinguishable from non-specific binding occurring to at least
one unrelated target. Specific binding can be the result of
formation of bonds between particular functional groups or
particular spatial fit (e.g., lock and key type) whereas
nonspecific binding is usually the result of van der Waals forces.
Specific binding does not, however, necessarily imply that a
monoclonal antibody binds one and only one target.
[0070] The term "symptom" refers to subjective evidence of a
disease, such as altered gait, as perceived by a subject. A "sign"
refers to objective evidence of a disease as observed by a
physician.
[0071] An individual is at increased risk of a disease if the
subject has at least one known risk-factor (e.g., genetic,
biochemical, family history, situational exposure) placing
individuals with that risk factor at a statistically significant
greater risk of developing the disease than individuals without the
risk factor. Statistical significance means p.ltoreq.0.05.
[0072] Unless otherwise apparent from the context, the term "about"
encompasses values within the standard deviation of the mean of a
stated value or +/-5% of a stated value, whichever is greater.
[0073] The term "9E4 antibody" refers to any antibody in which each
of the CDRs is substantially that of 9E4, and thus includes murine,
chimeric, veneered, and humanized 9E4.
[0074] Unless otherwise apparent from the context, reference to a
range includes any integer within the range.
DETAILED DESCRIPTION
I. General
[0075] 9E4 is an antibody binding to an epitope within amino acid
residues 118-126 of human alpha-synuclein. Humanized forms of the
antibody are described in WO/2013/063516, incorporated by reference
in its entirety for all purposes. The present application provides
liquid and lyophilized formulations incorporating chimeric,
veneered, or humanized forms of 9E4 (sometimes referred to as 9E4
antibodies). The formulations are designed to have combinations of
components conferring stability on the antibody as further
described below.
II. Target Molecules
[0076] Natural human wildtype alpha-synuclein is a peptide of 140
amino acids having the following amino acid sequence:
TABLE-US-00001 (SEQ ID NO: 12) MDVFMKGLSK AKEGVVAAAE KTKQGVAEAA
GKTKEGVLYV GSKTKEGVVH GVATVAEKTK EQVTNVGGAV VTGVTAVAQK TVEGAGSIAA
ATGFVKKDQL GKNEEGAPQE GILEDMPVDP DNEAYEMPSE EGYQDYEPEA
(Ueda et al., Proc. Natl. Acad. Sci. USA (1993) 90:11282-6);
GenBank accession number: P37840. The protein has three recognized
domains: a KTKE repeat domain covering amino acids 1-61; a NAC
(Non-amyloid component) domain running from about amino acids
60-95; and a C-terminal acidic domain running from about amino acid
98 to 140.
[0077] Unless otherwise apparent from the context, reference to
alpha-synuclein or its fragments includes the natural human
wildtype amino acid sequences indicated above, and human allelic
variants thereof, particularly those associated with Lewy body
disease (e.g., variants E46K, A30P and A53T, with the first letter
indicating the amino acid in SEQ ID NO:12, the number indicating
the codon position in SEQ ID NO:12, and the second letter
indicating the amino acid in the allelic variant). Such variants
can optionally be present individually or in any combination in any
of the aspects of the invention described below. The induced
mutations E83Q, A90V, A76T, which enhance alpha synuclein
aggregation, can also be present individually or in combination
with each other and/or human allelic variants E46K, A30P and
A53T.
III. Lewy Body Diseases
[0078] Lewy Body Diseases (LBD) are characterized by degeneration
of the dopaminergic system, motor alterations, cognitive
impairment, and formation of Lewy bodies (LBs). (McKeith et al.,
Neurology (1996) 47:1113-24). Lewy Bodies are spherical protein
deposits found in nerve cells. Their presence in the brain disrupts
the brain's normal function interrupting the action of chemical
messengers including acetylcholine and dopamine. Lewy Body diseases
include Parkinson's disease (including idiopathic Parkinson's
disease), Diffuse Lewy Body Disease (DLBD), also known as Dementia
with Lewy Bodies (DLB), Lewy Body variant of Alzheimer's disease
(LBV), Combined Alzheimer's and Parkinson disease, and multiple
system atrophy (MSA; e.g., Olivopontocerebellar Atrophy,
Striatonigral Degeneration, and Shy-Drager Syndrome). DLBD shares
symptoms of both Alzheimer's and Parkinson's disease. DLBD differs
from Parkinson's disease mainly in the location of Lewy Bodies. In
DLBD, Lewy Bodies form mainly in the cortex. In Parkinson's
disease, they form mainly in the substantia nigra. Other Lewy Body
diseases include Pure Autonomic Failure, Lewy Body dysphagia,
Incidental LBD, and Inherited LBD (e.g., mutations of the
alpha-synuclein gene, PARK3 and PARK4).
IV. Humanized 9E4 Antibodies
[0079] A. Binding Specificity and Functional Properties
[0080] Humanized antibodies of the invention specifically bind to
human alpha synuclein. The affinity of some humanized antibodies
(i.e., Ka) is preferably within a factor of five or two of that of
the mouse antibody 9E4. Some humanized antibodies have an affinity
that is the same (within expermental error) or greater than that of
the mouse 9E4 antibody. Preferred humanized antibodies bind to the
same epitope and/or compete with the mouse antibody 9E4 for binding
to human alpha synuclein.
[0081] In some antibodies, humanized 9E4 forms one arm of a
bispecific antibody, the other arm of which is an antibody that
binds to a receptor expressed on the blood brain barrier, such as
an insulin receptor, an insulin-like growth factor (IGF) receptor,
a leptin receptor, or a lipoprotein receptor, or preferably a
transferrin receptor (Friden et al., PNAS 88:4771-4775, 1991;
Friden et al., Science 259:373-377, 1993). Such a bispecific
antibody can be transferred cross the blood brain barrier by
receptor-mediated transcytosis. Brain uptake of the bispecific
antibody can be further enhanced by engineering the bi-specific
antibody to reduce its affinity to the blood brain barrier
receptor. Reduced affinity for the receptor resulted in a broader
distributioin in the brain (see, e.g., Atwal. et al. Sci. Trans.
Med. 3, 84ra43, 2011; Yu et al. Sci. Trans. Med. 3, 84ra44,
2011).
[0082] Exemplary bispecific antibodies can also be (1) a
dual-variable-domain antibody (DVD-Ig), where each light chain and
heavy chain contains two variable domains in tandem through a short
peptide linkage (Wu et al., Generation and Characterization of a
Dual Variable Domain Immunoglobulin (DVD-Ig.TM.) Molecule, In:
Antibody Engineering, Springer Berlin Heidelberg (2010)); (2) a
Tandab, which is a fusion of two single chain diabodies resulting
in a tetravalent bispecific antibody that has two binding sites for
each of the target antigens; (3) a flexibody, which is a
combination of scFvs with a diabody resulting in a multivalent
molecule; (4) a so called "dock and lock" molecule, based on the
"dimerization and docking domain" in Protein Kinase A, which, when
applied to Fabs, can yield a trivalent bispecific binding protein
consisting of two identical Fab fragments linked to a different Fab
fragment; (5) a so-called Scorpion molecule, comprising, e.g., two
scFvs fused to both termini of a human Fc-region. Examples of
platforms useful for preparing bispecific antibodies include but
are not limited to BiTE (Micromet), DART (MacroGenics), Fcab and
Mab2 (F-star), Fc-engineered IgG1 (Xencor) or DuoBody (based on Fab
arm exchange, Genmab).
[0083] B. Humanized Antibodies
[0084] A humanized antibody is a genetically engineered antibody in
which the CDRs from a non-human "donor" antibody are grafted into
human "acceptor" antibody sequences (see, e.g., Queen et al., U.S.
Pat. Nos. 5,530,101 and 5,585,089; Winter et al., U.S. Pat. No.
5,225,539, Carter, U.S. Pat. No. 6,407,213, Adair, U.S. Pat. Nos.
5,859,205 6,881,557, Foote, U.S. Pat. No. 6,881,557). The acceptor
antibody sequences can be, for example, a mature human antibody
variable region sequence, a composite of such sequences, a
consensus sequence of human antibody sequences (e.g., light and
heavy chain variable region consensus sequences of Kabat, 1991,
supra), or a germline variable region sequence. A preferred
acceptor sequence for the heavy chain is the human mature heavy
chain variable region of NCBI accession code AAC50998 (GI: 1791009)
or other mature heavy chain variable region derived from germline
IGHV3-7'01 or IGHV3-7'02 (clone name V3-7 or VH3-11) (Glas et al.,
Clin Exp Immunol. 107:372-80, 1997), or a mature heavy chain
variable region sequence incorporating one of these germ line
sequences. For the light chain, a preferred acceptor sequence is
the light chain mature variable region with NCBI accession code
AAY33350 (GI:63102889) or other mature light chain sequence derived
from the germline IGKV1D-39 or IGKV1-39 (clone name O2 or O12)
(Kramer et al., Eur J Immunol. 35:2131-45, 2005), or a light chain
mature variable region sequence incorporating one of these germ
line sequences. Thus, a humanized antibody of the invention
includes antibodies having three light chain and three heavy chain
CDRs as defined by Kabat from the murine 9E4 antibody (donor
antibody) and mature variable region framework sequences and
constant regions, if present, entirely or substantially from human
antibody sequences. Likewise a humanized heavy chain includes heavy
chains having three heavy chain CDRs as defined by Kabat from the
heavy chain of the murine 9E4 antibody, and a mature heavy chain
variable sequence and heavy chain constant region sequence, if
present, entirely or substantially from human antibody heavy chain
sequences. Likewise a humanized light chain includes light chains
having three light chain CDRs as defined by Kabat from the light
chain of the murine 9E4 antibody, and a mature light chain variable
sequence and light chain constant region sequence, if present,
entirely or substantially from human antibody light chain
sequences. The mature variable region framework sequences of an
antibody chain or the constant region sequence of an antibody chain
are substantially from a human mature variable region framework
sequence or human constant region sequence, respectively, when at
least 85%, 90%, 95%, 96%, 97%, 98%, 99% or 100% of corresponding
residues defined by Kabat are identical.
[0085] Certain amino acids from the human mature variable region
framework residues can be selected for substitution based on their
possible influence on CDR conformation and/or binding to antigen.
Investigation of such possible influences is by modeling,
examination of the characteristics of the amino acids at particular
locations, or empirical observation of the effects of substitution
or mutagenesis of particular amino acids.
[0086] For example, when an amino acid differs between a murine
mature variable region framework residue and a selected human
mature variable region framework residue, the human framework amino
acid can be substituted by the equivalent framework amino acid from
the mouse antibody when it is reasonably expected that the amino
acid:
[0087] (1) noncovalently binds antigen directly,
[0088] (2) is adjacent to a CDR region,
[0089] (3) otherwise interacts with a CDR region (e.g. is within
about 6 .ANG. of a CDR region)
[0090] (4) mediates interaction between the heavy and light
chains.
[0091] The invention provides formulations including humanized
forms of the mouse 9E4 antibody including three exemplified
humanized light chain mature variable regions (Hu9E4VLv1-v3; SEQ ID
NOs:3-5) and four exemplified humanized heavy chain mature variable
regions (Hu9E4VHv1-v4; SEQ ID NOs:8-11). SEQ ID NO:4 includes the
three Kabat CDRs of the mouse 9E4 light chain and the mature
variable region frameworks of AAY33350. SEQ ID NOS. 3 and 5 include
backmutations as shown in Table 2. SEQ ID NO: 11 includes the three
Kabat CDRs of mouse 9E4 and the mature variable region frameworks
of AAC50998. SEQ ID NOs:8-10 include backmutations as shown in
Table 3.
[0092] The invention provides formulations including variants of a
humanized 9E4 antibody disclosed herein, in which the humanized
heavy chain mature variable region shows at least 90%, 95% or 99%
identity to SEQ ID NOs:8-11 and the humanized light chain mature
variable region shows at least 90, 95 or 99% sequence identity to
SEQ ID NOs:3-5, but in which any variation from the designated SEQ
ID NO: occurs in a mature variable region framework rather than a
Kabat CDR. In some such antibodies, position L36 is occupied by Y
or F, and/or position L83 is occupied by F or L, and/or position
H73 is occupied by N or D and/or position H93 is occupied by A or S
(all positions here, as elsewhere, in this application are by Kabat
numbering). In some such antibodies, some or all of the
backmutations in Hu9E4VLv1-v3 and Hu9E4VHv1-v4 are retained. In
other words, one or both of heavy chain positions H73 and H93 is
occupied by D and A, respectively. Likewise, in some antibodies,
one or both of light chain positions L36 and L83 is occupied by F
and L, respectively. In some antibodies, 1, 2, 3 or all four of
positions H73, H93, L36 and L83 is/are occupied by D, A, F and L,
respectively. In some antibodies, 0, 1, or 2 positions are changed
in the heavy chain mature variable region framework relative to SEQ
ID NO:11, and 0, 1, or 2 positions are change in the light chain
mature variable region framework relative to SEQ ID NO:4.
[0093] The invention provides formulations in which some antibodies
comprise a humanized heavy chain comprising the three Kabat CDRs of
SEQ ID NO:11 and a humanized light chain comprising the three Kabat
CDRs of SEQ ID NO:4, provided that position L36 (Kabat numbering)
is occupied by F or Y and/or position L83 (Kabat numbering) is
occupied by L or F and/or position H73 (Kabat numbering) is
occupied by D or N, and/or position H93 (Kabat numbering) is
occupied by S or A. In some such antibodies, position L36 (Kabat
numbering) is occupied by F. In some such antibodies, position L36
(Kabat numbering) is occupied by F and position L83 (Kabat
numbering) is occupied by L. In some such antibodies, position L36
(Kabat numbering) is occupied by F and position H73 (Kabat
numbering) is occupied by D. In some such antibodies, position L36
(Kabat numbering) is occupied by F and position H93 (Kabat
numbering) is occupied by S. In some such antibodies, position L36
(Kabat numbering) is occupied by F and position H93 (Kabat
numbering) is occupied by A. In some such antibodies, position L36
(Kabat numbering) is occupied by F, position L83 (Kabat numbering)
is occupied by L, and position H73 (Kabat numbering) is occupied by
D. In some such antibodies, position L36 (Kabat numbering) is
occupied by F, position L83 (Kabat numbering) is occupied by L, and
position H93 (Kabat numbering) is occupied by S. In some such
antibodies, position L36 (Kabat numbering) is occupied by F,
position L83 (Kabat numbering) is occupied by L, and position H93
(Kabat numbering) is occupied by A. In some such antibodies,
position L36 (Kabat numbering) is occupied by F, position H73
(Kabat numbering) is occupied by D, and position H93 (Kabat
numbering) is occupied by S. In some such antibodies, position L36
(Kabat numbering) is occupied by F, position L83 is occupied by F,
position H73 (Kabat numbering) is occupied by D, and position H93
(Kabat numbering) is occupied by S. In some such antibodies,
position L36 (Kabat numbering) is occupied by F, position H73
(Kabat numbering) is occupied by D, and position H93 (Kabat
numbering) is occupied by A. In some such antibodies, position L36
(Kabat numbering) is occupied by F, position L83 (Kabat numbering)
is occupied by L, position H73 (Kabat numbering) is occupied by D,
and position H93 (Kabat numbering) is occupied by S. In some such
antibodies, position L36 (Kabat numbering) is occupied by F,
position L83 (Kabat numbering) is occupied by L, position H73
(Kabat numbering) is occupied by D, and position H93 (Kabat
numbering) is occupied by A. In some such antibodies, position L83
(Kabat numbering) is occupied by L. In some such antibodies,
position L83 (Kabat numbering) is occupied by L and position H73
(Kabat numbering) is occupied by D. In some such antibodies,
position L83 (Kabat numbering) is occupied by L and position H93
(Kabat numbering) is occupied by S. In some such antibodies,
position L83 (Kabat numbering) is occupied by L and position H93
(Kabat numbering) is occupied by A. In some such antibodies,
position L83 (Kabat numbering) is occupied by L, position H73
(Kabat numbering) is occupied by D, and position H93 (Kabat
numbering) is occupied by S. In some such antibodies, position L83
(Kabat numbering) is occupied by L, position H73 (Kabat numbering)
is occupied by D, and position H93 (Kabat numbering) is occupied by
A. In some such antibodies, position H73 (Kabat numbering) is
occupied by D. In some such antibodies, position H73 (Kabat
numbering) is occupied by D and position H93 (Kabat numbering) is
occupied by S. In some such antibodies, position H73 (Kabat
numbering) is occupied by D and position H93 (Kabat numbering) is
occupied by A. In some such antibodies, position H93 (Kabat
numbering) is occupied by S. In some such antibodies, position H93
(Kabat numbering) is occupied by A. In some such antibodies,
position L36 is occupied by Y, position L83 is occupied by F,
position H73 is occupied by N and position H93 is occupied by S.
Some exemplary antibodies with desirable residues at positions L36,
L83, H73, and H93 and combinations thereof are listed in Table 1
below.
TABLE-US-00002 TABLE 1 Exemplary antibodies with desirable residues
at positions L36, L83, H73, and H93 (Kabat numbering). Exemplary
Antibody L36 L83 H73 H93 1 F F N A 2 F L N A 3 F F D A 4 F F N S 5
(version 3) F L D A 6 F L N S 7 (version 1) F F D S 8 F L D S 9 Y L
N A 10 Y L D A 11 Y L N S 12 Y L D S 13 Y F D A 14 Y F D S 15
(version 2) Y F N S
TABLE-US-00003 TABLE 2 V.sub.H Backmutations V.sub.H exon donor
V.sub.H variant acceptor sequence framework residues Hu9E4VHv1 NCBI
accession code H73, H93 AAC50998 Hu9E4VHv2 NCBI accession code H93
AAC50998 Hu9E4VHv3 NCBI accession code H73 AAC50998
TABLE-US-00004 TABLE 3 V.sub.L Backmutations V.sub.L exon donor
V.sub.L variant acceptor sequence framework residues Hu9E4VLv1 NCBI
accession code L36 AAY33350 Hu9E4VLv2 NCBI accession code None
AAY33350 Hu9E4VLv3 NCBI accession code L36, L83 AAY33350
[0094] In some antibodies, the heavy chain mature variable region
has an amino acid sequence designated SEQ ID NO:10. In some
antibodies, the light chain mature variable region has an amino
acid sequence designated SEQ ID NO:5 or SEQ ID NO:3. In some such
antibodies, the heavy chain mature variable region has an amino
acid sequence designated SEQ ID NO:10, and the light chain mature
variable region has an amino acid sequence designated SEQ ID NO:5
or SEQ ID NO:3. In some such antibodies, the heavy chain mature
variable region has an amino acid sequence designated SEQ ID NO:10,
and the light chain mature variable region has an amino acid
sequence designated SEQ ID NO:5.
[0095] Other amino acid substitutions can be made in the mature
variable region framework, for example, in residues not in contact
with the CDRs. Often the replacements made in the variant humanized
sequences are conservative with respect to the replaced amino
acids. In some antibodies, replacements relative to Hu9E4VLv1-v3
and Hu9E4VHv1-v4 (whether or not conservative) have no substantial
effect on the binding affinity or potency of the resultant antibody
relative to Hu9E4VLv1-v3 and Hu9E4VHv1-v4, that is, its ability to
bind human alpha synuclein.
[0096] Variants typically differ from the heavy and light chain
mature variable region sequences of Hu9E4VLv1-v3 and Hu9E4VHv1-v4
by a small number (e.g., typically no more than 1, 2, 3, 5 or 10 in
either the light chain or heavy chain mature variable region
framework, or both) of replacements, deletions or insertions.
[0097] The formulations described below can include any of the
humanized 9E4 chains described above, or in the sequence listing or
elsewhere in the application in any combination of light and heavy
chains forming a humanized 9E4 antibody specifically binding to
human alpha-synuclein.
[0098] C. Chimeric and Veneered Antibodies
[0099] The invention further provides chimeric and veneered forms
of non-human antibodies, particularly 9E4.
[0100] A chimeric antibody is an antibody in which the mature
variable regions of light and heavy chains of a non-human antibody
(e.g., a mouse) are combined with light and heavy chain constant
regions from an antibody of a different species. Typically, the
light and heavy chain constant regions are of human origin, but the
constant regions can originate from a different non-human species,
such as a rat, as needed (e.g., to facilitate testing of the
non-human antibody in an appropriate animal model). Such antibodies
substantially or entirely retain the binding specificity of the
non-human (e.g., mouse) antibody supplying the variable regions,
and are about two-thirds human (or different non-human species)
sequence.
[0101] A veneered antibody is a type of humanized antibody that
retains some and usually all of the CDRs and some of the non-human
variable region framework residues of a non-human antibody but
replaces other variable region framework residues that may
contribute to B- or T-cell epitopes, for example exposed residues
(Padlan, Mol. Immunol. 28:489, 1991) with residues from the
corresponding positions of a human antibody sequence. The result is
an antibody in which the CDRs are entirely or substantially from a
non-human antibody and the variable region frameworks of the
non-human antibody are made more human-like by the substitutions.
Veneered forms of 9E4 are included in the invention.
[0102] D. Selection of Constant Region
[0103] The heavy and light chain variable regions of chimeric,
veneered or humanized antibodies can be linked to at least a
portion of a human constant region. The choice of constant region
depends, in part, whether antibody-dependent cell-mediated
cytotoxicity, antibody dependent cellular phagocytosis and/or
complement dependent cytotoxicity are desired. For example, human
isotopes IgG1 and IgG3 have complement-dependent cytotoxicity and
human isotypes IgG2 and IgG4 do not. Human IgG1 and IgG3 also
induce stronger cell mediated effector functions than human IgG2
and IgG4. Light chain constant regions can be lambda or kappa. An
exemplary human light chain kappa constant region has the amino
acid sequence of SEQ ID NO:13. Some such light chain kappa constant
regions can be encoded by a nucleic acid sequence. The N-terminal
arginine of SEQ ID NO:13 can be omitted, in which case light chain
kappa constant region has the amino acid sequence of SEQ ID NO:28.
Some such light chain kappa constant regions can be encoded by a
nucleic acid sequence. An exemplary human IgG1 heavy chain constant
region has the amino acid sequence of SEQ ID NO:14 (with or without
the C-terminal lysine) or the heavy chain constant region component
of SEQ ID NO:31. Some such heavy chain constant regions can be
encoded by a nucleic acid sequence. Antibodies can be expressed as
tetramers containing two light and two heavy chains, as separate
heavy chains, light chains, as Fab, Fab', F(ab')2, and Fv, or as
single chain antibodies in which heavy and light chain mature
variable domains are linked through a spacer.
[0104] Human constant regions show allotypic variation and
isoallotypic variation between different individuals, that is, the
constant regions can differ in different individuals at one or more
polymorphic positions. Isoallotypes differ from allotypes in that
sera recognizing an isoallotype bind to a non-polymorphic region of
a one or more other isotypes. Thus, for example, another heavy
chain constant region is of IgG1 G1m3 allotype and has the amino
acid sequence encoding a constant region of SEQ ID NO:32. Another
heavy chain constant region has the amino acid sequence of SEQ ID
NO:33. Yet another heavy chain constant region has the amino acid
sequence encoding a content region of SEQ ID NO:32 except that it
lacks the C-terminal lysine. Yet another heavy chain constant
region has the amino acid sequence of SEQ ID NO:33 except that it
lacks the C-terminal lysine.
[0105] One or several amino acids at the amino or carboxy terminus
of the light and/or heavy chain, such as the C-terminal lysine of
the heavy chain, may be missing or derivatized in a proportion or
all of the molecules. Substitutions can be made in the constant
regions to reduce or increase effector function such as
complement-mediated cytotoxicity or ADCC (see, e.g., Winter et al.,
U.S. Pat. No. 5,624,821; Tso et al., U.S. Pat. No. 5,834,597; and
Lazar et al., Proc. Natl. Acad. Sci. USA 103:4005, 2006), or to
prolong half-life in humans (see, e.g., Hinton et al., J. Biol.
Chem. 279:6213, 2004). Exemplary substitutions include a Gln at
position 250 and/or a Leu at position 428 (EU numbering is used in
this paragraph for the constant region) for increasing the
half-life of an antibody. Substitution at any or all of positions
234, 235, 236 and/or 237 reduce affinity for Fc.gamma. receptors,
particularly Fc.gamma.RI receptor (see, e.g., U.S. Pat. No.
6,624,821). Some antibodies have alanine substitution at positions
234, 235 and 237 of human IgG1 for reducing effector functions.
Optionally, positions 234, 236 and/or 237 in human IgG2 are
substituted with alanine and position 235 with glutamine (see,
e.g., U.S. Pat. No. 5,624,821).
[0106] E. Expression of Recombinant Antibodies
[0107] Antibodies can be produced by recombinant expression.
Nucleic acids encoding the antibodies can be codon-optimized for
expression in the desired cell-type (e.g., CHO or Sp2/0).
Recombinant nucleic acid constructs typically include an expression
control sequence operably linked to the coding sequences of
antibody chains, including naturally-associated or heterologous
promoter regions. The expression control sequences can be
eukaryotic promoter systems in vectors capable of transforming or
transfecting eukaryotic host cells. Once the vector has been
incorporated into the appropriate host, the host is maintained
under conditions suitable for high level expression of the
nucleotide sequences, and the collection and purification of the
crossreacting antibodies. The vector or vectors encoding the
antibody chains can also contain a selectable gene, such as
dihydrofolate reductase, to allow amplification of copy number of
the nucleic acids encoding the antibody chains.
[0108] E. coli is a prokaryotic host particularly useful for
expressing antibodies, particularly antibody fragments. Microbes,
such as yeast are also useful for expression. Saccharomyces is a
preferred yeast host, with suitable vectors having expression
control sequences, an origin of replication, termination sequences
and the like as desired. Typical promoters include
3-phosphoglycerate kinase and other glycolytic enzymes. Inducible
yeast promoters include, among others, promoters from alcohol
dehydrogenase, isocytochrome C, and enzymes responsible for maltose
and galactose utilizations.
[0109] Mammalian cells can be used for expressing nucleotide
segments encoding immunoglobulins or fragments thereof. See
Winnacker, From Genes to Clones, (VCH Publishers, N Y, 1987). A
number of suitable host cell lines capable of secreting intact
heterologous proteins have been developed in the art, and include
CHO cell lines, various COS cell lines, HeLa cells, HEK293 cells, L
cells, and non-antibody-producing myelomas including Sp2/0 and NS0.
It can be advantageous to use nonhuman cells. Expression vectors
for these cells can include expression control sequences, such as
an origin of replication, a promoter, an enhancer (Queen et al.,
Immunol. Rev. 89:49 (1986)), and necessary processing information
sites, such as ribosome binding sites, RNA splice sites,
polyadenylation sites, and transcriptional terminator sequences.
Suitable expression control sequences are promoters derived from
endogenous genes, cytomegalovirus, SV40, adenovirus, bovine
papillomavirus, and the like. See Co et al., J. Immunol. 148:1149
(1992).
[0110] Having introduced vector(s) encoding antibody heavy and
light chains into cell culture, cell pools can be screened for
growth productivity and product quality in serum-free media.
Top-producing cell pools can then be subjected of FACS-based
single-cell cloning to generate monoclonal lines. Specific
productivities above 50 pg or 100 pg per cell per day, which
correspond to product titers of greater than 7.5 g/L culture, can
be advantageous. Antibodies produced by single cell clones can also
be tested for turbidity, filtration properties, PAGE, IEF, UV scan,
HP-SEC, carboydrate-oligosaccharide mapping, mass spectrometery,
and bining assay, such as ELISA or Biacore. A selected clone can
then be banked in multiple vials and stored frozen for subsequent
use.
[0111] Once expressed, antibodies can be purified according to
standard procedures of the art, including protein A capture, column
chromatography (e.g., hydrophobic interaction or ion exchange),
low-pH for viral inactivation and the like (see generally, Scopes,
Protein Purification (Springer-Verlag, NY, 1982)).
[0112] Methodology for commercial production of antibodies
including codon optimization, selection of promoters, transcription
elements, and terminators, serum-free single cell cloning, cell
banking, use of selection markers for amplification of copy number,
CHO terminator, serum free single cell cloning, improvement of
protein titers (see, e.g., U.S. Pat. Nos. 5,786,464, 6,114,148,
6,063,598, 7,569,339, WO2004/050884, WO2008/012142, WO2008/012142,
WO2005/019442, WO2008/107388, and WO2009/027471, and U.S. Pat. No.
5,888,809).
V. Nucleic Acids
[0113] The invention further provides nucleic acids encoding any of
the heavy and light chains described above. Typically, the nucleic
acids also encode a signal peptide fused to the mature heavy and
light chains (e.g., signal peptides having amino acid sequences of
SEQ ID NOS: 22 and 24 that can be encoded by SEQ ID NOS: 23 and
25). Coding sequences on nucleic acids can be in operable linkage
with regulatory sequences to ensure expression of the coding
sequences, such as a promoter, enhancer, ribosome binding site,
transcription termination signal and the like. The nucleic acids
encoding heavy and light chains can occur in isolated form or can
be cloned into one or more vectors. The nucleic acids can be
synthesized by for example, solid state synthesis or PCR of
overlapping oligonucleotides. Nucleic acids encoding heavy and
light chains can be joined as one contiguous nucleic acid, e.g.,
within an expression vector, or can be separate, e.g., each cloned
into its own expression vector.
VI. Therapeutic Applications
[0114] The invention provides several methods of treating or
effecting prophylaxis of Lewy Body disease in patients suffering
from or at risk of such disease. Patients amenable to treatment
include individuals at risk of disease of a LBD but not showing
symptoms, as well as patients presently showing symptoms or the
early warning signs of synucleinopathies, for example, EEG slowing,
neuropsychiatric manifestations (depression, dementia,
hallucinations, anxiety, apathy, anhedonia), autonomic changes
(orthostatic hypotension, bladder disturbances, constipation, fecal
incontinence, sialorrhea, dysphagia, sexual dysfunction, changes in
cerebral blood flow), sensory changes (olfactory, pain, color
discrimination abnormal sensations), sleep disorders (REM sleep
behavior disorder (RBD), restless legs syndrome/periodic extremity
movements, hypersomnia, insomnia) and miscellaneous other signs and
symptoms (fatigue, diplopia, blurred vision, seborrhea, weight
loss/gain). Therefore, the present methods can be administered
prophylactically to individuals who have a known genetic risk of a
LBD. Such individuals include those having relatives who have
experienced this disease, and those whose risk is determined by
analysis of genetic or biochemical markers. Genetic markers of risk
toward PD include mutations in the alpha-synuclein or Parkin,
UCHLI, and CYP2D6 genes; particularly mutations at positions 30 and
53 of the alpha-synuclein gene. Individuals presently suffering
from Parkinson's disease can be recognized from its clinical
manifestations including resting tremor, muscular rigidity,
bradykinesia and postural instability.
[0115] In asymptomatic patients, treatment can begin at any age
(e.g., 10, 20, 30). Usually, however, it is not necessary to begin
treatment until a patient reaches 40, 50, 60 or 70. Treatment
typically entails multiple dosages over a period of time. Treatment
can be monitored by assaying antibody, or activated T-cell or
B-cell responses to a therapeutic agent (e.g., a truncated form of
alpha-synuclein peptide) over time. If the response falls, a
booster dosage is indicated.
[0116] Antibodies can be used for treating or effecting prophylaxis
of Lewy Body disease in patients by administration under conditions
that generate a beneficial therapeutic response in a patient (e.g.,
reduction of neuritic and/or axonal alpha synuclein aggregates,
reduction of neuritic dystrophy, improving cognitive function,
and/or reversing, treating or preventing cognitive decline) in the
patient. In some methods, the areas of neuritic dystrophy in the
neuropil of neocortex and/or basal ganglia can be reduced by on
average at least 10%, 20%, 30%, or 40% in treated patients compared
with a control population.
[0117] Cognitive impairment, progressive decline in cognitive
function, changes in brain morphology, and changes in
cerebrovascular function are commonly observed in patients
suffering from or at risk of Lewy Body disease. Administration of
the present antibodies can inhibit or delay decline of cognitive
function in such patients.
[0118] The invention also provides methods of preserving or
increasing synaptic density and/or dentritic density. An index of
changes in synaptic or dentritic density can be measured by markers
of synapse formation (synaptophysin) and/or dendrites (MAP2). In
some methods, the synaptic or dentritic density can be restored to
the level of synaptic or dentritic density in a healthy subject. In
some methods, the mean level of synaptic or dentritic density in
treated patients can be elevated by 5%, 10%, 15%, 20%, 25%, 30% or
more as compared to a population of untreated control patients.
VII. Methods of Treatment
[0119] In prophylactic applications, an antibody or agent for
inducing an antibody or a formulation including the same is
administered to a patient susceptible to, or otherwise at risk of a
disease in a regime (dose, frequency and route of administration)
effective to reduce the risk, lessen the severity, or delay the
onset of at least one sign or symptom of the disease. In some
prophylactic applications, the regime is effective to inhibit or
delay accumulation of alpha synuclein and truncated fragments in
the brain, and/or inhibit or delay its toxic effects and/or
inhibit/or delay development of behavioral deficits. In therapeutic
applications, an antibody or agent to induce an antibody is
administered to a patient suspected of, or already suffering from a
Lewy body disease in a regime (dose, frequency and route of
administration) effective to ameliorate or at least inhibit further
deterioration of at least one sign or symptom of the disease. In
some therapeutic applications, the regime is effective to reduce or
at least inhibit further increase of levels of alpha synuclein and
truncated fragments, associated toxicities and/or behavioral
deficits.
[0120] A regime is considered therapeutically or prophylactically
effective if an individual treated patient achieves an outcome more
favorable than the mean outcome in a control population of
comparable patients not treated by methods of the invention, or if
a more favorable outcome is demonstrated in treated patients versus
control patients in a controlled clinical trial (e.g., a phase II,
phase II/III or phase III trial) at the p<0.05 or 0.01 or even
0.001 level.
[0121] Effective doses vary depending on many different factors,
including means of administration, target site, physiological state
of the patient including type of Lewy body disease, whether the
patient is an ApoE carrier, whether the patient is human or an
animal, other medications administered, and whether treatment is
prophylactic or therapeutic.
[0122] An exemplary dosage range for antibodies is from about 0.1
to 50 mg/kg of patient body weight. Antibody can be administered
such doses daily, on alternative days, weekly, fortnightly,
monthly, quarterly, annually or according to any other schedule
determined by empirical analysis. An exemplary treatment entails
administration in multiple dosages over a prolonged period, for
example, of at least six months. Additional exemplary treatment
regimes entail administration once per every two weeks or once a
month or once every 3 to 6 months.
[0123] Antibodies can be administered via a peripheral route (i.e.,
one in which an administered antibody crosses the blood brain
barrier to reach an intended site in the brain. Routes of
administration include topical, intravenous, oral, subcutaneous,
intraarterial, intracranial, intrathecal, intraperitoneal,
intranasal or intramuscular. Some routes for administration of
antibodies are intravenous and subcutaneous. This type of injection
is most typically performed in the arm or leg muscles. In some
methods, agents are injected directly into a particular tissue
where deposits have accumulated, for example intracranial
injection.
[0124] The present regimes can be administered in combination with
another agent effective in treatment or prophylaxis of the disease
being treated. For example, in the case of Parkinson's disease,
immunotherapy against alpha synuclein WO/2008/103472, Levodopa,
benzaseride, carbidopa, dopamine agonists, non-ergot dopamine
agonists, catechol-O-methyl ("COMT") inhibitors such as, for
example, entacopone or tolcopone, monoamine oxidase ("MAO")
inhibitors, such as, for example, rasagaline, amantadine, or
anticholinergic agents can be used in combination with the present
regimes.
[0125] An effective dosage of any of the pharmaceutical
formulations described in greater detail below can be administered
to therapeutically or prophylactically treat a human patient having
or at risk for a synucleinopathy. Some of the formulations
described below can be added to an infusion bag suitable for
intravenous administration to a patient, for example for
administration every four weeks. Some patients have been diagnosed
with Parkinson's disease. The formulations described herein can be
administered at a dose of about 0.3 mg/kg, about 1 mg/kg, about 3
mg/kg, about 10 mg/kg or about 30 mg/kg humanized 9E4 drug
substance. In some patients, the dose may be further adjusted
according to tolerance, safety, pharmacokinetics, efficacy and
other parameters that may be determined empirically.
VIII. Formulations
[0126] Formulations (also known as pharmaceutical compositions) of
the invention comprise an antibody (e.g., a chimeric, veneered or
humanized version of murine 9E4 (ATCC Accession Number PTA-8221))
or antigen binding fragment thereof, a buffer, one or more sugars
and/or polyols and a surfactant, and have a pH within the range
from about 5 to about 7.5. The formulations can be prepared for
storage in liquid form or in lyophilized form. When stored in
lyophilized form, the formulations can be reconstituted with a
liquid (e.g., sterile water) to the concentrations and properties
described herein. When a lyophilized composition is said to be
reconstitutable by adding water to generate a formulation of
specified component concentrations and pH, it is meant that the
lyophilized formulation can be so reconstituted simply by addition
of water (i.e., without supplying additional amounts of components
or adding acid or base to change the pH). The concentrations and
properties of a prelyophilized liquid formulation can also be in
accordance with those described below if the lyophilized
formulation is reconstituted to the same volume as the formulation
prelyophilization. If the volume is different, then concentrations
of formulations should be adjusted proportionally. For example, if
the reconstituted volume is half the prelyophilization volume, then
the concentrations of components in the prelyophilization
formulation should be half the concentrations in the reconstituted
formulation.
[0127] Optionally, 9E4 antibody purified from a CHO cell culture is
resuspended in a formulation as described below, temporarily frozen
for storage prelyophilization, lyophilized, and reconstituted with
water to the same concentrations as prelyophilization. Such a
formulation should preferably stabilize the antibody throughout
freezing, lyophilization, storage, and reconstitution as well as
being suitable for parenteral administration. In an exemplary work
flow, purified antibody is resuspended at about 40 mg/ml in
Formulation 3 (Table 10) and stored frozen at -40 C in bags. Bags
are thawed at room temperature for 3 hours and the contents are
pooled. The formulation is sterile filtered through a 0.2 micron
sterile filer. Vials are filled with 5.4 ml of the formulation and
lyophilized. Lyophilized vials are stored at 2-8 C. Lyophilized
vials are reconstituted by adding sterile water (e.g.,
approximately 5.0 to 5.4 ml sterile water, depending on the
formulation). 5 ml of the reconstituted product is then added into
the port of an IV bag containing 20-100 ml of normal saline,
lactated Ringers solution, or 5% dextrose solution or the like for
intravenous infusion into a patient.
[0128] Some formulations include a bulking agent, which may or may
not be the same as the sugar/polyol component. Typically, the
formulations are sterile, for example, as accomplished by sterile
filtration using a 0.2 .mu.m or a 0.22 .mu.m filter. Some
formulations have a bioburden of .ltoreq.about 3 CFU/30 mL. Some
formulations contain .ltoreq.about 0.1 EU/mg of bacterial
endotoxins. The formulations of the invention are also generally
stable by low to undetectable levels of fragmentation and/or
aggregation as further defined below on freezing and thawing. Still
other formulations are stable following reconstitution of a
lyophilized cake for at least three months at 40 degrees Celsius.
In some formulations, less than about 10% of the antibody is
present as an aggregate in the formulation. In some formulations,
less than or equal to about 5% of the antibody is present as an
aggregate in the formulation.
[0129] In some formulations, the antibody is present at a
concentration within the range from about 5 mg/mL to about 100
mg/mL. In some formulations, the antibody is present at a
concentration within the range from about 5 mg/mL to about 50
mg/mL. In some formulations, the antibody is present at a
concentration within the range from about 25 mg/mL to about 50
mg/mL. For example, the antibody may be present at a concentration
of about 35-45 mg/ml or about 40 mg/mL. The antibody may be present
in a sterile liquid dosage form of about 50 mg/vial to about 500
mg/vial, or greater. The antibody may be present in a lyophilized
dosage form of about 40 mg/vial to about 500 mg/vial. For example,
the antibody may be present in a sterile liquid or lyophilized
dosage form of about 250-350 mg/vial or about 200 mg/vial.
[0130] Antibodies used in the disclosed formulations can be coupled
with a therapeutic moiety, such as a cytotoxic agent, a
radiotherapeutic agent, an immunomodulator, a second antibody
(e.g., to form an antibody heteroconjugate), or any other
biologically active agent that facilitates or enhances the activity
of the formulated antibody (e.g., chimeric, veneered or humanized
9E4). Representative therapeutic moieties include agents known to
be useful for treatment, management, or amelioration of a Lewy body
disease or symptoms of a synucleinopathy.
[0131] The formulated antibody can comprise any of the chimeric,
veneered or humanized versions of antibody 9E4 described above. For
example, the antibody can comprise a light chain variable region
comprising the three Kabat CDRs of SEQ ID NO: 4 and a heavy chain
variable region comprising the three Kabat CDRs of SEQ ID NO: 11.
The formulation can include an antibody comprising a light chain
variable region having an amino acid sequence comprising any one of
SEQ ID NO: 3, SEQ ID NO: 4, or SEQ ID NO: 5, and/or a heavy chain
variable region having an amino acid sequence comprising any one of
SEQ ID NO: 8, SEQ ID NO: 9, SEQ ID NO: 10, or SEQ ID NO: 11. Some
formulations include an antibody comprising a light chain variable
region having the amino acid sequence comprising SEQ ID NO: 5. Some
formulations include an antibody comprising a heavy chain variable
region having the amino acid sequence comprising SEQ ID NO: 10. For
example, the formulated antibody can comprise a light chain having
the amino acid sequence comprising SEQ ID NO: 5 and a heavy chain
having the amino acid sequence comprising SEQ ID NO: 10.
[0132] Buffers are used in the disclosed formulations to achieve a
suitable pH for the antibody, such as, for example, histidine,
succinate, and citrate buffers. Some formulations have a pH within
the range from about 5.5 to about 7, for example, a pH of 5.5, 5.6,
5.7, 5.8, 5.9, 6.0, 6.1, 6.2, 6.3, 6.4, 6.5, 6.6, 6.7, 6.8, 6.9, or
7.0. Some formulations have a pH of between about 5.5 to about 6.5.
Some formulations have a pH of about 6.0 and other formulations
have a pH of about 6.5. In some formulations, citrate buffer or
succinate buffer is present at a concentration within the range
from about 10 mM to about 30 mM, for example, at a concentration of
about 15-25 mM or about 20 mM. Some citrate buffers comprise sodium
citrate dehydrate and citric acid monohydrate at a concentration
within the range from about 15 mM to about 20 mM and a range from
about 2 mM to about 6 mM, respectively.
[0133] Suitable sugars and/or polyols for the formulations include
trehalose, sucrose, mannitol, or a combination thereof.
Sugars/polyols serves as bulking agents, lyoprotecting agent,
and/or tonicity adjusting agents. For example, some formulations
include trehalose present at a concentration within the range from
about 220 mM to about 260 mM, sucrose present at a concentration
within the range from about 220 mM to about 260 mM, or a mixture of
sucrose present at a concentration within the range from about 20
mM to about 40 mM and mannitol present at a concentration within
the range from about 200 mM to about 220 mM. Some formulations
include trehalose present at a concentration of about 230 mM or 240
mM. Other formulations include sucrose present at a concentration
of about 230 mM or 240 mM. Other formulations include a mixture of
sucrose present at a concentration of about 50 mM and mannitol
present at a concentration of about 200 mM. Another formulation
includes a mixture of sucrose present at a concentration of about
28 mM and mannitol present at a concentration of about 212 mM. Some
such formulations are characterized by an osmolality in the range
of about 250-400, 300-400, or 300-350 mOsm/kg, such as, for
example, 335 mOsm/kg.
[0134] Formulations preferably contain a surfactant to reduce
antibody aggregation and absorption to surfaces. Suitable
surfactants include polysorbate 20 (PS20) present at a
concentration within the range from about 0.005% to about 0.05% by
weight. PS20 protects against marked increases in aggregation or
turbidity that would otherwise occur in formulations of 9E4
antibodies. The polysorbate 20 may be present at a concentration
within the range from about 0.01% to about 0.05%. For example, the
concentration can be 0.005%, 0.01%, 0.015%, 0.02%, 0.025%, 0.03%,
0.035%, 0.04%, 0.045%, or 0.05%. Alternatively, in some
formulations, polysorbate 20 is present at a concentration within
the range of about from about 0.05 g/L, 0.1 g/L, 0.15 g/L, 0.2 g/L,
0.25 g/L, 0.3 g/L, 0.35 g/L, 0.4 g/L, 0.45 g/L, or 0.5 g/L. Some
formulations include polysorbate 20 at a concentration of 0.2 g/L
(i.e., 0.163 mmol/L).
[0135] An exemplary formulation (liquid, prelyophilization or
reconstituted after lyophilization) is characterized by a pH within
the range from about 5.5 to about 7 and includes: (a) a chimeric,
veneered, or humanized version of antibody 9E4, or a fragment
thereof that specifically competes for binding to antigen with 9E4
at a concentration within the range from about 10 mg/ml to about 50
mg/ml; (b) a citrate buffer or succinate buffer present at a
concentration within the range from about 10 mM to about 30 mM; (c)
one or more sugars and polyols ("sugar/polyol") selected from
trehalose present at a concentration within the range from about
220 mM to about 260 mM, sucrose present at a concentration within
the range from about 220 mM to about 260 mM, and a mixture of
sucrose present at a concentration within the range from about 20
mM to about 40 mM and mannitol present at a concentration within
the range from about 200 mM to about 220 mM; and (d) polysorbate 20
present at a concentration within the range from about 0.005% to
about 0.05% by weight. For example, the formulation can include:
(a) an antibody comprising a light chain having the amino acid
sequence set forth as SEQ ID NO: 29 and a heavy chain comprising an
amino acid sequence set forth as SEQ ID NO: 32, with or without the
C-terminal lysine, and which is present at a concentration of about
40 mg/mL; (b) a citrate buffer at a concentration of about 20 mM;
(c) trehalose at a concentration of about 230 mM; (d) polysorbate
20 at a concentration of about 0.02%; and a pH of about 6.0.
[0136] Some lyophilized formulations include: (a) a humanized
version of antibody 9E4 or an antigen binding fragment thereof; (b)
citrate; (c) trehalose; and polysorbate 20. The lyophilized
formulation can include about 200 mg of the antibody. Some
lyophilized formulations are capable of being reconstituted with
sterile water. Some lyophilized formulations include 100-300 or
150-250 mg 9E4 antibody, 15-35 or 20-25 mg sodium citrate
dehydrate, 1.65-2.75 or 2-2.3 mg citric acid monohydrate, 360-500
or 400-470 mg trehalose dehydrate, and 0.5 to 1.5 mg or 0.75 to
1.25 mg polysorbate 20. An exemplary lyophilized formulation
includes 200 mg of a 9E4 antibody (e.g., humanized 9E4 antibody),
25 mg of sodium citrate dehydrate, 2.15 mg citric acid monohydrate,
435 mg trehalose dehydrate, and 1 mg polysorbate 20. Another
exemplary lyophilized formulation includes 200 mg of a 9E4 antibody
(e.g., humanized 9E4 antibody), 25 mg of sodium citrate dehydrate,
3.15 mg citric acid monohydrate, 435 mg trehalose dehydrate, and 1
mg polysorbate 20. Such formulations are preferably reconstituted
to a volume of about 5 ml. Other lyophilized formulations include
the same components in the same proportions as any disclosed in
this paragraph but in different amounts (e.g., 400 mg antibody, 50
mg sodium citrate, 4.3 mg citric acid monohydrate, 870 mg Trehalose
dehydrate, and 2 mg polysorbate 20).
[0137] Lyophilized formulations are preferably reconstituted to an
antibody concentration of about 30-50 or 35-45 mg/mL, preferably
about 40 mg/mL; (b) a citrate buffer present at a concentration of
about 10-30 or 15-25 mM, preferably about 20 mM; (c) trehalose
present at a concentration of about 160-330 or 200-260 mM
preferably about 230 mM; (d) polysorbate 20 present at a
concentration of about 0.1-0.3 or 0.15 to 0.25 g/L, preferably
about 0.2 g/L; and (e) a pH of about 5.5-6.5, preferably about
6.0.
[0138] Liquid or reconstituted lyophilized formulations are
preferably substantially isotonic, implying an osmolality of about
250-350 mOsm/kg water. Some formulations have an osmolality of
about 335 mOsm/kg. Some formulations have an osmolality of 270-300
mOsm/kg. Liquid or reconstituted lyophilized formulations can also
be hypertonic .gtoreq.350 mOsm/kg water or hypotonic (.ltoreq.250
mOsm/kg water).
[0139] Some lyophilized formulations appear as a white to yellowish
powder. Some liquid or reconstituted lyophilized formulations
appear as a solution practically free of foreign particles and may
contain a few translucent, white to whitish product-typical
particles. Some liquid or reconstituted lyophilized formulations
have .ltoreq.about 6,000 sub-visible particles .gtoreq.10 .mu.m per
vial (volume=5 ml) and/or .ltoreq.about 600 sub-visible particles
.gtoreq.25 .mu.m per vial. Some liquid or reconstituted lyophilized
formulations appear as colorless to slightly yellow
(.ltoreq.reference solution BY3). Some liquid or reconstituted
lyophilized formulations appear as clear to slightly opalescent
(.ltoreq.reference suspension III).
[0140] Any of the formulations described can be made without
pharmaceutical excipients, carriers or the like, other than those
described as being components herein. Such a formulation can be
described as consisting of the recited components, or consisting
essentially of the recited components if insignificant amounts of
other components not affecting the properties of the formulation
are present. Formulations are preferably made under good
manufacturing practices (GMP) approved or approvable by the FDA for
preparation of drugs for administration to humans.
[0141] Antibodies used in the disclosed formulations can also be
coupled with a detectable label, for example, as useful for
diagnosing a synucleinopathy, for monitoring progression of a
synucleinopathy, and/or for assessing efficacy of treatment.
Antibodies formulated as described are particularly useful for
performing such determinations in subjects having or being
susceptible to a synucleinopathy such as Parkinson's disease, or in
appropriate biological samples obtained from such subjects.
Representative detectable labels that may be coupled or linked to a
humanized 9E4 antibody include various enzymes, such as horseradish
peroxidase, alkaline phosphatase, beta-galactosidase, or
acetylcholinesterase; prosthetic groups, such streptavidinlbiotin
and avidin/biotin; fluorescent materials, such as but
umbelliferone, fluorescein, fluorescein isothiocynate, rhodamine,
dichlorotriazinylamine fluorescein, dansyl chloride or
phycoerythrin; luminescent materials, such as luminol;
bioluminescent materials, such as luciferase, luciferin, and
aequorin; radioactive materials, such as but not limited to iodine
(.sup.131I, .sup.125I, .sup.123I, .sup.121I,), carbon (.sup.14C),
sulfur (.sup.5S), tritium (.sup.3H), indium (.sup.115In,
.sup.113In, .sup.112In, .sup.111In), and technetium (.sup.99Tc),
thallium (.sup.201Ti), gallium (.sup.68Ga, .sup.67Ga), palladium
(.sup.103Pd), molybdenum (.sup.99Mo), xenon (.sup.113Xe), fluorine
(.sup.18F), .sup.153Sm, .sup.177Lu, .sup.159Gd, .sup.149Pm,
.sup.140La, .sup.175Yb, .sup.166Ho, .sup.90Y, .sup.47Sc,
.sup.186Re, .sup.188Re, .sup.142Pr, .sup.105Rh, .sup.97Ru,
.sup.68Ge, .sup.57Co, .sup.65Zn, .sup.85Sr, .sup.32P, .sup.153Gd,
.sup.169Yb, .sup.51Cr, .sup.54Mn, .sup.75Se, .sup.113Sn, and
.sup.117Tin; positron emitting metals using various positron
emission tomographies, nonradioactive paramagnetic metal ions, and
molecules that are radiolabelled or conjugated to specific
radioisotopes.
[0142] Therapeutic moieties and/or detectable substances may be
coupled or conjugated directly to a murine, chimeric, veneered, or
humanized 9E4 antibody, or indirectly, through an intermediate
(e.g., a linker) using techniques known in the art. See e.g., Arnon
et al., "Monoclonal Antibodies For Immunotargeting Of Drugs In
Cancer Therapy", in Monoclonal Antibodies And Cancer Therapy,
Reisfeld et al. (eds.), pp. 243-56 (Alan R. Liss, Inc. 1985);
Hellstrom et al., "Antibodies For Drug Delivery", in Controlled
Drug Delivery (2nd Ed.), Robinson et al. (eds.), pp. 623-53 (Marcel
Dekker, Inc. 1987); Thorpe, "Antibody Carriers Of Cytotoxic Agents
In Cancer Therapy: A Review", in Monoclonal Antibodies 84:
Biological And Clinical Applications, Pinchera et al. (eds.), pp.
475-506 (1985); "Analysis, Results, And Future Prospective Of The
Therapeutic Use Of Radiolabeled Antibody In Cancer Therapy", in
Monoclonal Antibodies For Cancer Detection And Therapy, Baldwin et
al. (eds.), pp. 303-16 (Academic Press 1985), and Thorpe et al.,
Immunol. Rev., 1982, 62:119-58.
[0143] Antibodies used in the disclosed formulations also include
modified forms of murine, chimeric, veneered, or humanized 9E4
antibodies, which have increased in vivo half-lives relative to the
corresponding unmodified antibodies. Such modified forms may be
prepared, for example, by glycosylation, acetylation, pegylation,
phosphorylation, amidation, derivatization by known
protecting/blocking groups, proteolytic cleavage, linkage to a
cellular ligand or other protein. As one example, representative
methods for antibody half-life extension are described in WO
02/060919.
[0144] The present invention encompasses antibody formulations
having stability at 38.degree. C.-42.degree. C. (e.g., as assessed
by high performance size exclusion chromatography (HPSEC)) for at
least about 30 days, formulations having stability at 20.degree.
C.-24.degree. C. for at least about 1 year, and formulations having
stability at 2.degree. C.-4.degree. C. for at least about 3 years.
Stability of lyophilized formulations is assessed for storage in
the lyophilized state. A formulation is considered stable if, after
incubation at one or more of these specified combinations of time
and temperature, it meets the below definition for low to
undetectable fragmentation and/or low to undetectable aggregation.
More particularly, the disclosed formulations exhibit low to
undetectable levels of antibody aggregation and/or fragmentation,
or a low or undetectable increase in antibody fragmentation and/or
aggregation above an initial level (e.g., less than about 10%
aggregation). Some formulations exhibit .ltoreq.about 5% combined
aggregation and/or fragmentation. A formulation having low to
undetectable levels of fragmentation contains at least about 80%,
85%, 90%, 95%, 98%, or 99%, of the total protein, for example, in a
single peak as determined by high performance size exclusion
chromatography (HPSEC), or in two peaks (one corresponding to each
of the antibody heavy chains and antibody light chains) by reduced
Capillary Gel Electrophoresis (rCGE), representing the non-degraded
antibody, and containing no other single peaks having more than 5%,
more than 4%, more than 3%, more than 2%, more than 1%, or more
than 0.5% of the total protein each. A formulation having low to
undetectable levels of aggregation contains no more than about 15%,
no more than about 10%, no more that about 5%, no more than about
4%, no more than about 3%, no more than about 2%, no more than
about 1%, or no more than about 0.5% aggregation by weight protein,
as measured by high performance size exclusion chromatography
(HPSEC). For example, in some formulations, less than about 10% of
the anti-synuclein antibody is present as an aggregate. Stable
formulations of the invention also show little or no loss of
biological activity(ies) of a chimeric, veneered or humanized 9E4,
having, for example, binding affinity measurable by ELISAs and/or
additional functional assay, that is at least about 50%, 55%, 60%,
65%, 70%, 75%, 80%, 85%, 90%, 95%, 98%, or 99% of an initial
measurable value. Some formulations have a binding affinity that is
from about 60% to about 140% of an initial measurable value of the
reference material.
IX. Preparation of Pharmaceutical Formulations
[0145] The present invention also provides methods of preparing
pharmaceutical formulations. In one aspect of the invention, such a
method comprises: (a) culturing mammalian cells having stably
incorporated into their genome nucleic acids encoding the light and
heavy chains of murine antibody 9E4 (ATCC Accession Number
PTA-8221), or of a chimeric, veneered, or humanized versions
thereof, so that the cells secrete the antibody into the cell
culture media; (b) purifying the antibody from the cell culture
media; and (c) preparing any of the formulations described
above.
[0146] The preparation of a pharmaceutical formulation can include
the additional step of evaluating at least one property of an
antibody in the formulation, selected from the group consisting of
physical stability, chemical stability, and biological
activity.
[0147] For example, mammalian cells can be cultured for the
production of antibodies, wherein the mammalian cells have stably
incorporated into their genomes nucleic acids encoding the light
and heavy chains of a humanized 9E4 antibody. Mammalian cells
useful for this purpose include host cells having stably
incorporated into their genomes a nucleic acid sequence encoding an
antibody light chain set forth as SEQ ID NO: 29 and an antibody
heavy chain set forth as SEQ ID NO: 31 or 32.
[0148] For the production of antibodies, the disclosed nucleic
acids are included in a vector. In some examples, the vector
contains the nucleic acid encoding murine 9E4 antibody, or a
chimeric, veneered, or humanized version thereof, operably linked
to a suitable control sequence capable of effecting the expression
of the DNA in a host cell. Such control sequences include a
promoter to effect transcription (e.g., a constitutive promoter or
inducible promoter as known in the art), an optional operator
sequence to control such transcription, a sequence encoding
suitable mRNA ribosome binding sites, enhancers, polyadenylation
signals, and sequences to control the termination of transcription
and translation. The vector may be a plasmid, a phage particle
(e.g., a viral vector such as adenovirus, adeno-associated-virus,
retrovirus, herpes virus, vaccinia virus, lentivirus, poxvirus and
cytomegalovirus vectors), or simply a genomic insert. Once
transformed into a suitable host, the antibody nucleic acids may
integrate into the genome of the host, or the vector may replicate
and function independently of the host genome.
[0149] The disclosed nucleic acids are included in a vector either
singly or in combination (e.g., a combination of a nucleic acid
encoding an antibody light chain and a nucleic acid encoding an
antibody heavy chain).
[0150] Host cells useful for preparing antibody formulations of the
invention include mammalian cells, including cells of human origin,
human embryonic kidney cells, monkey kidney cells, baby hamster
kidney (BHK) cells, Chinese hamster ovary cells (CHO) cells, mouse
sertoli cells, human cervical carcinoma (HeLa) cells, canine kidney
cells, human lung cells, human liver cells, mouse mammary tumor
cells, and NS0 cells.
[0151] Alternatively, a chimeric, veneered, or humanized 9E4
antibody can be prepared by chemical synthesis and then used in the
disclosed formulations.
[0152] Antibodies used to prepare the disclosed formulations are
typically isolated or purified, i.e., substantially free of
cellular material or other contaminating proteins from the cells in
which they are produced, or substantially free of chemical
precursors or other chemicals when chemically synthesized. For
example, an antibody that is substantially free of cellular
material includes preparations of the antibody having less than
about 30%, 25%, 20%, 15%, 10%, 8%, 5%, 2%, 1%, 0.5%, 0.1%, or less
(by dry weight) of contaminating protein. When an antibody is
recombinantly produced, it is also substantially free of culture
medium such that culture medium represents less than about 30%,
25%, 20%, 15%, 10%, 8%, 5%, 2%, 1%, 0.5%, 0.1%, or less, of the
volume of the protein preparation. When an antibody is produced by
chemical synthesis, it is preferably substantially free of or
separated from chemical precursors or other chemicals involved in
the synthesis of the protein. Accordingly, such antibody
preparations have less than about 30%, 25%, 20%, 15%, 10%, 8%, 5%,
2%, 1%, 0.5%, 0.1%, or less (by dry weight) of chemical precursors
or compounds other than the antibody drug substance. For example,
some preparations of the antibody drug substance have the following
purity as determined by the following assays: protein A ELISA
(.ltoreq.about 25 ng/mg), CHOP ELISA (.ltoreq.about 100
U.sup.2/mg), IGF-1 ELISA (.ltoreq.about 1 ng/mg), insulin ELISA
(.ltoreq.about 1 ng/mg), and DNA qPCR (.ltoreq.about 3 pg/mg
protein). Some preparations of the antibody drug substance have a
bioburden of .ltoreq.about 10 CFU/mL. Some preparations of the
antibody drug substance contain .ltoreq.about 0.5 EU/mg of
bacterial endotoxins. Purification of recombinantly expressed
antibody can utilize any of a number of methods known in the art,
such as, for example, affinity chromatography, acid treatment,
depth filtration, anion exchange chromatography, cation exchange
chromatography, nanofiltration, ultrafiltration, dialysis and
diafiltration.
[0153] The purified antibody drug substance can be adjusted to a
solution comprising any of the formulations described herein,
diluted to the desired concentration and stored until ready for
use. Optionally, the formulation can be stored in concentrated form
until ready for use.
[0154] Liquid formulations can be stored in frozen form, under
refrigeration, or at room temperature, depending on their stability
profile, which can be determined empirically. In some instances a
further filtration step is applied. Some of the formulations
described herein may be lyophilized and stored in powder form.
Lyophilized formulations can be stored in frozen form, under
refrigeration or at room temperature, depending on their stability
profile, which can be determined empirically. For example, the
lyophilized formulations can be stored at a temperature of about
2.degree. C. to 8.degree. C. In such cases, the formulation would
be reconstituted prior to administration to a patient to yield a
liquid formulation having the antibody and excipients present in
the concentrations described herein. In some cases, the formulation
is reconstituted in sterile water. In some cases, the formulation
is reconstituted and added to an infusion bag for administration to
the patient. The reconstituted formulation can be stored under
refrigeration or at room temperature prior to administration to a
patient for a time consistent with the stability profile.
Lyophilization and reconstitution techniques are known in the art
and described in the Examples.
[0155] Either a liquid formulation or reconstituted lyophilized
formulation can be added to infusion bag containing a diluent such
as normal saline or Ringer's solution before administration to the
patient. The volume of the infusion bag is usually relatively large
(e.g., 50 ml to 1 L, or 100-500 ml) compared with the volume of the
liquid formulation or constituted lyophilized formulation (e.g.,
1-10 ml). Several liquids can be used in the infusion bag, such as
normal saline, lactated Ringers solution, or 5% dextrose solution,
each of which is substantially isotonic. In an exemplary regime
about 5 ml of liquid or reconstituted lyophilized formulation is
injected through the port of a 100-ml bag of normal saline and
administered by iv infusion over a period of about an hour at a
flow rate of about 1.75 ml/min.
[0156] Thus, the present invention also encompasses pharmaceutical
products comprising lyophilized antibody drug substance and
instructions for reconstitution and use. Some pharmaceutical
products comprise: (a) a vial comprising about 40 to about 200 mg
antibody in powder form; and (b) instructions for reconstitution of
the antibody. An exemplary pharmaceutical product includes: (a) a
vial comprising, in powder form, about 200 mg antibody, about 25 mg
sodium citrate dehydrate, about 3.15 mg citric acid monohydrate,
about 435 mg trehalose dehydrate and about 1 mg polysorbate 20; (b)
instructions for reconstitution; and (c) instructions for preparing
the reconstituted formulation for infusion, wherein (i) the
antibody comprises a light chain comprising an amino acid sequence
set forth as SEQ ID NO: 29 and a heavy chain comprising an amino
acid sequence set forth as SEQ ID NO: 32 with or without the
C-terminal lysine; and (ii) the reconstitution instructions require
reconstitution with water for injection to an extractable volume of
5 mL.
EXAMPLES
[0157] The following examples have been included to illustrate
modes of the invention. Certain aspects of the following examples
are described in terms of techniques and procedures found or
contemplated by the present co-inventors to work well in the
practice of the invention. In light of the present disclosure and
the general level of skill in the art, those of skill appreciate
that the following examples are intended to be exemplary only and
that numerous changes, modifications, and alterations may be
employed without departing from the scope of the invention.
Example 1: Preparation of the Expression Vector
[0158] The humanized 9E4-specific sequences of the variable regions
of both heavy and light chain (SEQ ID NOS: 32 and 29, respectively)
were subcloned into expression vectors which contain genetic
elements allowing for the enrichment of high-producers (e.g.,
transcription enhancing element (TS), polyadenylation signals,
neomycin phosphotransferase mutant).
[0159] Using the plasmid pCET Hu9E4VLv3.hCK as a template, the
variable region of the light chain was isolated by PCR, introducing
at the 5' ends of the fragments an EcoRV restriction site and at
the 3' ends a KpnI restriction site for subcloning into the vectors
pBI-60 and pBI-90 digested with the same restriction enzymes. These
vectors contained the genomic constant region of a human kappa
chain. In addition, the vectors pBI-60 and pBI-90 encode the
attenuated selection marker neomycin phosphotransferase for
enrichment of high producers during selection. pBI-60 encodes the
F240I mutant of neomycin phosphotransferase and vector pBI-90
encodes the D227V mutant.
[0160] Using the plasmid pCET Hu9E4VHv3.hlgG1 as a template, the
variable region of humanized 9E4 heavy chain was isolated by PCR,
introducing at the 5' ends an MfeI restriction site and at the 3'
ends a BlpI restriction site for subcloning. The variable region
was cloned into the MfeI and BamHI digested eukaryotic expression
vector pBI-61, containing the genomic constant regions of human
IgG1 of G1m(3) allotype. The vector encodes the selectable marker
dihydrofolate reductase (DHFR) from hamster.
Example 2: Production of Humanized 9E4 Antibody
[0161] The plasmids pBI-61/9E4 HC and pBI-60/9E4 LC were
co-transfected into Chinese Hamster Ovary (CHO) cells pre-adapted
to serum-free growth media. The cells were grown in chemically
defined media without any bovine-derived components. The culture
media for established cell lines was as follows:
Preinocculation Medium:
TABLE-US-00005 [0162] Component BI-Mat.Nr. Conc./L WFI 27259 0.80 L
GMBI 211 80264 11.90 g NaHCO3 23904 4.50 g Supplement III 70994
1.80 g Insulin Stock sol 65422 2 mL No2 pharma Glucose anhydrous
29603 5.0 g L-Glutamine 23516 1.45 g Supplement I 71455 2.50 g
Succinic acid 42949 1.50 g WFI 27259 0.176 L 40% NaOH 26181 as
needed
Preparation of Preinocculation Medium:
[0163] 1) WFI starting volume 80% of total volume; temperature at
start 28 to 35.degree. C.
[0164] 2) Add components one by one, according to the list (above),
as soon as each previous component is dissolved completely.
[0165] 3) WFI rest volume 0.176 L/L medium
[0166] 4) Prior to filtration, adjust pH to between 7.00 and
7.20
[0167] 5) Prior to filtration, osmolarity is 280 to 320
mOsmol/kg
Post-Inoculation Additions:
[0168] Nutrient Feed Medium
[0169] 3% Glutamine solution
[0170] Glucose solution (500 g/L)
[0171] 1 M Sodium Carbonate solution
[0172] 2% Antifoam emulsion
Nutrient Feed Medium:
TABLE-US-00006 [0173] Component BI-Mat.Nr. Conc./L WFI 27259 0.70 L
GMBI 220 80265 76.60 g Sodium Bicarbonate 23904 1.50 g Supplement
III 70994 0.56 g Insulin Stock sol 65422 10 mL No2 pharma Glucose
anhydrous 29603 83.40 g Supplement II 71456 4.95 g L-Cysteine
.times. HCl .times. 55946 2.60 g H2O WFI 27259 0.179 L 40% NaOH
26181 as needed
Preparation of Nutrient Feed Medium:
[0174] 1) WFI starting volume 70% of total volume; temperature at
start 30 to 40.degree. C.
[0175] 2) Add components one by one, according to the list (above),
as soon as each previous component is dissolved completely
[0176] 3) WFI rest volume 0.179 L/L medium
[0177] 4) Prior to filtration, adjust pH to between 6.90 and
7.10
[0178] 5) Prior to filtration, osmolality is 1185 to 1585
mOsmol/kg
Medium Filtration:
[0179] Prefilter--0.2 .mu.m filters
[0180] Final filter--0.1 .mu.m filters
[0181] Antibody was pooled from stable transfected cells from which
the production cell line was ultimately derived. The pool-derived
material was purified by protein A-affinity chromatography and
other purification techniques, as described below.
Example 3: Antibody Purification
[0182] Protein A is a bacterial protein used for affinity
purification of humanized, veneered, or chimeric 9E4 antibodies.
Protein A chromatography typically involves passage of clarified
cell culture supernatant over the column at pH 6-8, under which
conditions the antibodies bind and unwanted components, such as
host cell proteins, cell culture media components, and putative
viruses, flow through the column. An optional intermediate wash
step may be carried out to remove non-specifically bound impurities
from the column, followed by elution of the product at pH 2.5-4.
Types of Protein A resins classified based on their resin backbone
composition include glass or silica-based, e.g., Prosep vA, Prosep
vA Ultra (Millipore); agarose-based, e.g., Protein A Sepharose Fast
Flow, Mab Select (GE Healthcare); and organic polymer based, e.g.,
polystyrene-divinylbenzene Poros A and MabCapture (Applied
Biosystems). Several elution buffer components such as acetic acid,
citric acid, phosphoric acid, arginine HCl and glycine HCl can be
used.
[0183] Viruses can be removed by treatment at low pH or filtration
among other methods. Current virus-retentive filters are
ultrafilters or microfilters with very small pores. Virus
filtration membranes are made from hydrophilic polyethersulfone
(PES), hydrophilic polyvinylidene (PVDF) and regenerated
cellulose.
[0184] Depth filters are used in the clarification of cell culture
broths, to maintain capacity on membrane filters or to protect
chromatography columns or virus filters. Depth filters are
typically made of cellulose, a porous filter-aid such as
diatomaceous earth and an ionic charged resin binder. Depth filters
can employ both size exclusion and adsorptive binding to effect
separation.
[0185] Ion exchange chromatography uses positively or negatively
charged resins to bind proteins based on their net charges in a
given buffer system. Conditions (e.g., pH and ionic strength) can
be determined that bind and release the target antibody with a high
degree of specificity. Conversely, conditions can be found that
bind nearly all other sample components except antibodies. Anion
exchange chromatography uses a positively charged group (weakly
basic such as diethylamino ethyl, DEAE or dimethylamino ethyl,
DMAE; or strongly basic such as quaternary amino ethyl, Q or
trimethylammonium ethyl, TMAE or quaternary aminoethyl, QAE).
[0186] Cation exchange chromatography uses a resin modified with
negatively charged functional groups. They can be strong acidic
ligands such as sulphopropyl, sulfoethyl and sulfoisobutyl groups
or weak acidic ligand such as carboxyl group. Cation exchange
chromatography has been applied for purification processes for many
mAbs with pI values ranging from neutral to basic. The antibody is
bound onto the resin during the loading step and eluted through
either increasing conductivity or increasing pH in the elution
buffer. Negatively charged process-related impurities such as DNA,
some host cell protein, leached Protein A and endotoxin are removed
in the load and wash fraction. Cation exchange chromatography can
also separate deamidated products, oxidized species and N-terminal
truncated forms, as well as high molecular weight species from the
desired antibody. Binding of antibodies on cation exchange resins
depends on pH and conductivity, and resin type. SP Sepharose FF and
SP Sepharose XL are two common commercially available resins.
[0187] Ultrafiltration is a pressure-driven membrane process for
antibody concentration and buffer exchange. Ultrafiltration is a
size-based separation in which species larger than the membrane
pores are retained and smaller species pass through freely.
Separation in ultrafiltration is achieved through differences in
the filtration rates of different components across the membrane
under a given pressure driving force. Buffer exchange is achieved
using a diafiltration mode in which buffer of the final desired
composition is added to the retentate system at the same rate in
which filtrate is removed, thus maintaining a constant retentate
volume. Ultrafiltration with membrane pores ranging from 1 to 20 nm
can provide separation of species ranging in molecular weight from
500 daltons to 1,000 kilodaltons.
[0188] 9E4 antibody product was captured from the harvest filtrate
by rProtein-A affinity chromatography using Mab Select resin from
GE Healthcare. The product binds to the Protein A resin at neutral
pH and is eluted in an isocratic mode with 100 mM sodium acetate at
pH 3.0. The majority of host cell impurities and cell culture
medium components are reduced during this step. A separate wash
step with half PAIN buffer (500 mM NaCl, 1.34 mM KCl, 4 mM
Na.sub.2HPO.sub.4.times.2H.sub.2O, 0.735 mM
KH.sub.2PO4.times.2H.sub.2O, 0.125% PVP=kollidon 17, 7.5%
isopropanol, 4.3 mM NaOH, 250 mM L-arginine-HCL, pH 7.4,
conductivity 45 mS/cm) was implemented to remove components still
remaining on the column and to minimize turbidity in the
neutralized AT product pool. The protein A step was performed in a
maximum of three cycles by splitting the harvest pool in similar
loads. The column was equilibrated to pH 7.4.+-.0.2 and
conductivity 16.+-.3 mS/cm with 1.47 mM KH2PO4.times.2H2, 8.03 mM
Na2HPO4.times.2H2O 137 mM NaCl, 2.68 mM KCl to remove storage
solution and to prepare the column for loading. The column was then
loaded with a maximum of 30 g/L harvest filtrate, washed (3
buffers, 3 Column Volumes each), and eluted. After elution, the
column is stripped by means of 0.1M phosphoric acid and
equilibrated for the next cycle or fully regenerated and stored, if
the subsequent cycle is performed the next day. Full regeneration
with 0.1M phosphoric acid (strip), 6M urea and 1M acetic acid is
performed after the last cycle.
[0189] The pooled and 0.2 .mu.m filtered MabSelect product pool is
adjusted to pH 3.5 with 1 M acetic acid (stirred) and incubated for
60-70 minutes at room temperature for viral inactivation (without
stirring). Neutralization under stirring is performed by addition
of 1 M tris base to pH 5.50.+-.0.20.
[0190] The acid treated product pool is immediately passed over to
the following depth filtration step. The depth filtration by Cuno
Zeta Plus 60ZA is a step for the removal of turbidities. The virus
inactivated product pool is filtered by a two-stage filtration
process consisting of the above mentioned depth filter material in
series with a 0.2 .mu.m PES membrane filter.
[0191] The depth filtration product pool was further purified by
anion exchange chromatography (AEX) using Q-Sepharose Fast Flow
resin from GE Healthcare in a flow-through mode. The AEX step
reduces residual host cell DNA and removes viruses. The column was
equilibrated to pH 7.50.+-.0.20 and conductivity 8.0.+-.1.0 mS/cm
with Q equilibration buffer (42.8 mM trometamol-HCl 7.2 mM tris
base, 39 mM NaCl) to remove the storage solution and to prepare the
column for loading. During loading the product flowed through the
column while impurities bound to the resin. After loading/eluting,
the column was washed with Q equilibration buffer to recover the
product remaining in the mobile phase on the column. After product
recovery the column was regenerated and finally stored.
[0192] The adjusted Q-Sepharose product pool was further purified
by cation exchange chromatography (CEX) using Poros HS50 from
Applied Biosystems. The product bound to the column under low salt
conditions (36.2 mM CH.sub.3COONa.times.3H.sub.2O, 13.8 mM
CH.sub.3COOH, 58.5 mM NaCl, pH 5.1, conductivity 8 mS/cm) and was
then eluted in an isocratic mode under high salt conditions (38 mM
CH3COONa.times.3H2O, 12 mM CH.sub.3COOH, 228 mM NaCl, pH 5.1,
conductivity 25.5 mS/cm). An additional wash step with medium salt
amount (37.2 mM CH.sub.3COONa.times.3H.sub.2O, 12.8 mM
CH.sub.3COOH, 102.5 mM NaCl, pH 5.1, conductivity 13.5 mS/cm) was
implemented to remove contaminants such as host cell proteins, high
molecular weight product variants and leached Protein A. The CEX
step was performed for a maximum of 2 cycles. In such instances,
the adjusted AEX pool is separated into 2 equal volumes and
processed individually on the CEX column.
[0193] The virus filtration (VF) provides a second orthogonal
method specifically for the removal of virus particles and was
designed to remove particles that are larger than 20 nm (e.g.
Parvovirus). The virus filtration was accomplished via a pressure
transfer of the Poros HS50 product pool through 0.1 .mu.m prefilter
and a viral filter (Planova 20 N, Asahi Kasei) in series, with a
1.0 bar pressure drop across the nanofilter. Integrity testing of
the virus filter was performed pre-use (leak test) and post-use
(leak test and gold particle test).
[0194] The nano-filtered product pool was concentrated to .about.20
g/L (UF1) and is then diafiltered at constant volume against
.gtoreq.6 volumes of diafiltration buffer (17 mM
C.sub.6H.sub.5Na.sub.3O.sub.7.times.2 H.sub.2O, 3
mMC.sub.6H.sub.8O.sub.7.times.H.sub.2O, pH 6, conductivity 4
mS/cm). After diafiltration the pool was concentrated to .about.75
g/L (UF2). Finally, the retentate was removed from the UF/DF system
by flushing with diafiltration buffer to a concentration of
.about.52 g/L (="30 kD product pool").
[0195] The 30 kD product pool was mixed in a ratio 4+1 with 5-fold
trehalose/Tween20 (Polysorbate 20) spike buffer (17 mM
C.sub.6H.sub.5Na.sub.3O.sub.7.times.2 H2O, 3
mMC.sub.6H.sub.8O.sub.7.times.H.sub.2O, 1150 mM
trehalose.times.2H2O, 1 g/L polysorbate 20, pH 5.9, conductivity
1.0 mS/cm) and diluted with formulation buffer (17 mM
C.sub.6H.sub.5Na.sub.3O.sub.7.times.2 H.sub.2O, 3 mM
C.sub.6H.sub.8O.sub.7.times.H.sub.2O, 230 mM
trehalose.times.2H.sub.2O, 0.2 g/L polysorbate 20, pH 6.0,
conductivity 3.30 mS/cm) to get a protein concentration of
40.0.+-.2.0 g/L.
[0196] The bulk material was filtered through a 0.2 .mu.m pool
filter and a 0.2 .mu.m bag filter connected in series. An
additional pre-filter to the 0.2 .mu.m filter may be implemented
for particle removal. The 0.2 .mu.m pool filter was tested for
integrity. If the pool filter fails the testing, each bag filter is
tested separately for integrity.
Example 4: Formulation Development
[0197] Throughout this example, humanized 9E4 antibody having the
light chain sequence of SEQ ID NO: 29 and the heavy chain sequence
of SEQ ID NO: 32 was used.
[0198] Physicochemical Characterization.
[0199] To facilitate selection of potential formulation components,
the termal characteristics of humanized 9E4 antibody were
determined. Differential scanning calorimetry ("DSC"), right angle
light scattering ("RALS") and intrinsic fluorescence ("IF")
techniques were used in the analysis. Purified antibody was first
heated from 10.degree. C. to 71.degree. C., then cooled from
71.degree. C. to 10.degree. C., then heated again from 10.degree.
C. to 83.degree. C., then cooled again from 83.degree. C. to
10.degree. C., and finally heated again from 10.degree. C. to
95.degree. C. The DSC thermogram revealed two transitions, the
first at 71.degree. C. and the second at 83.degree. C. See FIG. 1.
The transition of 71.degree. C. was reversible under the
experimental conditions. The RALS and IF thermograms revealed a
single transition at an intermediate temperature.
[0200] pH Optimization.
[0201] The stability of humanized 9E4 was next analyzed in a mixed
buffer system having pH values ranging from 3.5 to 8.0. Again, DSC,
RALS, and IF techniques were used in the analysis. As before, two
transitions were detected in the DSC thermogram (with the exception
of a third transition detected at pH 3.5) and a single intermediate
transition was detected in the RALS and IF termograms. The first
thermal transition in the DSC analysis increased with increasing pH
until a pH of 6.5, when it leveled off at about 71.degree. C.
(Table 4, below, & FIG. 2). The second thermal transition in
the DSC analysis peaked at around 83.degree. C., between a pH of
5.0 and 6.5. The thermal transition in the RALS analysis remained
at about 77.degree. C. for the pH range of 4.5-8.0, and the IF
thermal transition varied between 75.degree. C. and 77.degree. C.
over the same pH range (FIG. 2). Based on the results, a pH range
of 5.5 to 7.0 was determined to provide the most stability for
humanized 9E4 antibody.
TABLE-US-00007 TABLE 4 DSC Thermal Transition Peaks for Humanized
9E4 as a Function of pH pH Tm1 (.degree. C.) Tm* (.degree. C.) Tm2
(.degree. C.) 3.5 43.6 59.0 75.1 4.0 54.9 -- 79.8 4.5 59.2 -- 81.4
5.0 65.9 -- 82.7 5.5 68.8 -- 83.1 6.0 70.6 -- 83.0 6.5 71.3 -- 82.8
7.0 71.3 -- 82.3 7.5 71.3 -- 82.2 8.0 71.0 -- 82.0
[0202] Buffer Selection.
[0203] Based on the the pH-dependent stability results for
humanized 9E4 antibody, buffer systems were identified which are
pharmaceutically acceptable for parenteral use and could provide
sufficient buffer capacity in the pH range between pH 5.5 and 7.0.
These buffer systems included 20 mM citrate buffer (pH 5.5; 6.0),
20 mM histidine buffer (pH 6.0; 6.5; 7.0), and 20 mM succinate
buffer (pH 6.5). The thermal stability of humanized 9E4 antibody in
the 20 mM succinate and 20 mM histidine buffers was tested by DSC,
RALS, and IF. As determined by DSC, humanized 9E4 antibody in the
citrate buffer, at a pH between 5.5 and 6.0, showed a significantly
higher second thermal transition (Tm2) as compared to humanized 9E4
antibody in the histidine buffer (Table 5, below). Conversely,
humanized 9E4 antibody in the histidine buffer, at a pH between 6.5
and 7.0, showed a higher first thermal transition (Tm1) as compared
to humanized 9E4 antibody in the citrate buffer (Table 5). No
thermal transitions were detected for the histidine buffered
antibody using the RALS technique. The citrate buffered antibody,
however, exhibited a thermal transition at 78.degree. C. at pH 5.5
and 6.0.
[0204] Succinate buffered humanized 9E4 antibody (pH 6.5) was also
analyzed by DSC and RALS and the results compared to citrate
buffered (pH 6.5) and histidine buffered (pH 6.5) antibody. For the
DSC analysis, the second thermal transition (Tm2) in the citrate
and succinate buffers was approximately 1.degree. C. higher than in
the histinde buffer, indicating a slightly higher stablity of the
protein under the tested conditions. Comparable transition
temperatures were detected by RALS for the succinate and citrate
buffers at pH 6.5.
[0205] Based on these findings 20 mM citrate (pH 6.0) and 20 mM
succinate (pH 6.5) buffers were selected for use in producing a
lyophilized drug product and testing its long-term stability.
TABLE-US-00008 TABLE 5 DSC Thermal Transition Peaks for Humanized
9E4 as a Function of Buffer Buffer Tm1 (.degree. C.) Tm2 (.degree.
C.) Citrate (pH 5.5) 68.8 83.4 Citrate (pH 6.0) 70.2 83.2 Histidine
(pH 6.0) 68.9 81.9 Histidine (pH 6.5) 71.3 81.9 Histidine (pH 7.0)
71.4 82.5 Succinate (pH 6.5) 71.8 82.8
[0206] Sugar/Polyol Selection.
[0207] With the goal of increasing stability of humanized 9E4
antibody in a freeze dried formulation, the impact of sugars and
polyols on the thermal stability of the antibody was analyzed. The
sugars/polyols evaluated included trehalose, sucrose, or a mixture
of sucrose and mannitol. 240 mM trehalose, 240 mM sucrose, and 50
mM sucrose/200 mM mannitol were each added to 20 mM succinate (pH
6.5), 20 mM histidine (pH 6.5), and 20 mM citrate (pH 6.5) buffers.
The stability of the humanized 9E4 antibody was then evaluated by
DSC for each of the formulations. The DSC results revealed that the
the various sugars/polyols shifted the first and second thermal
transitions to higher temperatures, indicating a stabilizing effect
(Table 6, below). However, the trehalose formulations consistently
had the highest thermal transitions (Table 6). In addition, the
second transition temperature (Tm2) in the histidine formulations
was lower than in the citrate and succinate formulations (Table
6).
TABLE-US-00009 TABLE 6 DSC Thermal Transition Peaks for Humanized
9E4 as a Function of Buffer and Sugar/Polyol Formulation Tm1
(.degree. C.) Tm2 (.degree. C.) Succinate (pH 6.5) + 72.6 83.6
Sucrose/Mannitol Succinate (pH 6.5) + 72.8 83.8 Sucrose Succinate
(pH 6.5) + 72.9 83.9 Trehalose Histidine (pH 6.5) + 72.3 82.6
Sucrose/Mannitol Histidine (pH 6.5) + 72.6 82.8 Sucrose Histidine
(pH 6.5) + 72.6 83.0 Trehalose Citrate (pH 6.5) + 71.9 83.4
Sucrose/Mannitol Citrate (pH 6.5) + 72.1 83.7 Sucrose Citrate (pH
6.5) + 72.5 83.7 Trehalose
[0208] RALS measurements were also performed on humanized 9E4
antibodies formulated with the various sugars/polyols in succinate
or citrate buffer (pH 6.50. For the succinate buffer, the 240 mM
trehalose formulation had the highest transition temperature
(77.degree. C.), the 240 mM sucrose formulation had an intermediate
transition temperature (76.degree. C.), and the 50 mM sucrose/200
mM mannitol formulation had the lowest transition temperature
(75.degree. C.). For the citrate buffer, the 240 mM trehalose
formulation and the 50 mM sucrose/200 mM mannitol formulation had
the same transition temperature (78.degree. C.), and the 240 mM
sucrose formulation had a lower transition temperature (77.degree.
C.). The difference of only 1.degree. C. in the thermal transition
for the citrate formulations was within the testing
variability.
[0209] Surfactant.
[0210] The effect of polysorbate 20 ("PS20") on thermal stability
was tested using DSC and determined to have no impact on the
transition temperatures of humanized 9E4 antibody. However, a
positive effect of PS20 was observed with respect to shaking
stress. Two formulations were tested for their reaction to shaking
stress: (A) 20 mM Citrate, pH 6.0, 230 mM trehalose, 0.02% (w/w)
PS20; and (B) 25 mM Citrate, pH 6.0, 230 mM trehalose. The
formulation with PS20 (Formulation A) provided a lower degree of
foam formation and a constant turbidity level even after 24 hours
of shaking. Formulation B had a strong foam formation and an
increase in turbidity after 3 hours of shaking. Neither formulation
led to the generation of visible particles during the shaking
study.
[0211] Next, the effect of PS20 on formulation turbidity induced by
shaking was evaluated. The turbidity of Formulation A did not
increase even after 24 hours of shaking. In contrast, the turbidity
of Formulation B almost doubled, increasing from 17 FNU (Formazin
Nephelometric Units) prior to shaking to 32 FNU after 24 hours of
shaking (Table 7).
TABLE-US-00010 TABLE 7 Turbidity (FNU) of Humanized 9E4 Antibody
Formulations Prior to and Post Shaking Initial Value 3 hrs 6 hrs 24
hrs Formulation A 18 18 18 18 Formulation B 17 20 25 32
[0212] Measurements of antibody aggregation prior to and after
shaking similarly evidence a stabilizing effect of PS20. The amount
of monomeric and aggregated antibody in Formulations A and B was
assessed by high performance size exclusion chromatography (HPSEC)
prior to shaking and after 3, 6, and 24 hours of shaking. The
presence of PS20 in Formulation A correlated with a slight increase
(0.2%) in the amount of aggregated antibody (Table 8) and a
corresponding decrease (0.2%) in the amount of monomeric antibody
(Table 9). In contrast, Formulation B (w/out PS20) exhibited a
four-fold higher increase in aggregated antibody (Table 8) and a
correspondingly elevated decrease (0.9%) in the amount of monomeric
antibody (Table 9).
TABLE-US-00011 TABLE 8 Humanized 9E4 Antibody Aggregation (%) Prior
to and Post Shaking Initial Value 3 hrs 6 hrs 24 hrs Formulation A
2.6 2.6 2.6 2.8 Formulation B 2.5 2.7 3.0 3.3
TABLE-US-00012 TABLE 9 Humanized 9E4 Antibody Monomer Level (%)
Prior to and Post Shaking Initial Value 3 hrs 6 hrs 24 hrs
Formulation A 97.2 97.1 97.1 97.0 Formulation B 97.2 97.0 96.7
96.3
[0213] Thus, the results of the shaking study revealed that PS20
prevents undesirable increases in turbidity and antibody
aggregation in humanized 9E4 antibody formulations.
[0214] Lyophilization Feasibility Study.
[0215] Based on the foregoing analyses, formulations 1-4 (Table 10,
below) were selected to evaluate the feasibility of storage of
humanized 9E4 antibody in lyophilized form.
TABLE-US-00013 TABLE 10 Humanized 9E4 Antibody Test Formulations
Formulation ID Formulation Description F1 40 mg/ml humanized 9E4
antibody, 20 mM succinate, 230 mM trehalose, 0.02 w % polysorbate
20, pH 6.5 F2 40 mg/ml humanized 9E4 antibody, 20 mM succinate, 28
mM sucrose, 212 mM mannitol, 0.02 w % polysorbate 20, pH 6.5 F3 40
mg/ml humanized 9E4 antibody, 20 mM citrate, 230 mM trehalose, 0.02
w % polysorbate 20, pH 6.0 F4 40 mg/ml humanized 9E4 antibody, 20
mM citrate, 28 mM sucrose, 212 mM mannitol, 0.02 w % polysorbate
20, pH 6.0
[0216] As an initial step in developing a lyophilization cycle, the
thermal properties of the frozen F1-F4 formulations were studied. A
Mettler Toledo DSC 821 instrument was used to determine the glass
transition (Tg') temperature of each of the formulations.
Measurements were made while the following freeze/thaw cycle:
[0217] Freezing: 5.degree. C. to 70.degree. C. at 5K/min.
[0218] Hold: 3 minutes at -70.degree. C.
[0219] Heating: -70.degree. to 25.degree. C. at 5K/min.
Table 11 lists the glass transition temperatures identified in this
manner. Formulations 2 and 4 (which include sucrose and mannitol)
exhibit a lower Tg' as compared to the trehalose formulations,
while the use of different buffers did not significantly impact
Tg'. Because of their higher Tg', the trehalose formulations
(Formulations 1 and 3) can withstand a higher product temperature
during primary drying, which is favorable for the freeze drying
process.
TABLE-US-00014 TABLE 11 Glass Transition Temperatures for
Formulations F1 through F4 Formulation Tg' (onset) Tg' (mid point)
F1 -27.degree. C. -26.degree. C. F2 -35.degree. C. -34.degree. C.
F3 -36.degree. C. -25.degree. C. F4 -34.degree. C. -33.degree.
C.
[0220] Based on the determined glass transition temperatures, two
different lyophilization cycles were developed and tested. The
first cycle includes a primary drying step that is performed at
-10.degree. C. (shelf temperature) (Table 12). The primary drying
step in the second cycle is performed at -20.degree. C. (shelf
temperature) (Table 13).
TABLE-US-00015 TABLE 12 Lyophilization Cycle 1 for Lyophilization
Feasibility Study Step Time Temp Vacuum MKS No. (hh:mm) (.degree.
C.) (mbar) Loading 01 - - - 5 Off Freezing 02 01:30 5 Off 05 02:00
-50 Off 06 01:00 -50 Off 07 00:30 -50 Off Primary Drying 08 00:01
-50 0.10 09 01:30 -10 0.10 10 60:00 -10 0.10 Secondary 11 02:00 30
0.10 Drying 12 08:00 30 0.10 Total Time 76:31
TABLE-US-00016 TABLE 13 Lyophilization Cycle 2 for Lyophilization
Feasibility Study Time Temp Vacuum MKS Step No. (hh:mm) (.degree.
C.) (mbar) Loading 01 - - - 5 Off Freezing 02 01:30 5 Off 05 02:00
-50 Off 06 01:00 -50 Off 07 00:30 -50 Off Primary Drying 08 00:01
-50 0.10 09 01:30 -20 0.10 10 45:00 -20 0.10 Secondary 11 04:00 30
0.10 Drying 12 08:00 30 0.10 Total Time 63:31
[0221] The lyophilization feasibility study was carried out in
small scale using an Epsilon 2-12D, GT-12-B Lyophilizer (Christ).
Following 0.2 .mu.m filtration, 5.4 ml.+-.0.2 ml aliquots of
formulated antibody were added to 20 ml vials (Type I clear glass
vials, 20/25 mL, Blow Back, from Schott). The resulting vials had a
nominal fill volume of 5.0 ml and a nominal dosage of 200 mg/vial.
The intended reconstitution volume following lyophilization was 5.0
ml water. The vials were manually loaded into the lyophilizer and
lyophilized according to cycle 1 or cycle 2. Product temperature
was monitored using PT100 sensors placed in vials. The cycles were
carried out without any deviations. The formulations supercooled to
a minimum temperature of -6.5.degree. C. prior to the
crystallization of water, after which the formulations were frozen
to -50.degree. C. For the primary drying phase, a vacuum of 0.10
mbar (capacitance manometer) was applied, at a shelf temperature of
-10.degree. C. (cycle 1) or -20.degree. C. (cycle 2). For cycle 1,
these parameters led to a mean product temperature of -28.degree.
C. to -25.degree. C. during sublimation. For cycle 2, these
parameters led to a mean product temperature below -30.degree. C.
during sublimation. The actual duration of primary drying was about
40 hours for both cycles. After primary drying, the shelf
temperature was increased to 30 C (secondary drying) to allow for
desorption of the unfrozen water. The secondary drying phase was
set for a period of 8 hours, with the goal that the lyophilized
formulations would have a final moisture level of about 1%.
Following lyophilization, the vials were stoppered (Stelmi C1404
6720GC 6 TP3, 20 mm) and sealed (Aluminum flip-off seal, 20
mm).
[0222] The trehalose containing formulations were completely
amorphous after lyophilization and exhibited some shrinkage. In
contrast, the mannitol containing formulations were partially
crystalline and exhibited no shrinkage. Cake height for all of the
formulations was about 11 mm. Cake mass was about 685 mg (F1), 516
mg (F2), 700 mg (F3), and 520 mg (F4). For all formulations, the
cake had a slightly yellow color.
[0223] The characteristics of lyophilized formulations produced by
cycle 1 and cycle 2 were analyzed and compared, including moisture
levels, reconstitution time, number of subvisible particles. See
Table 14 (below). In addition, the quality of the lyophilized
formulations was compared to the product quality prior to
lyophilization. The additional characteristics tested included
clarity, pH, osmolarity, amount of monomer vs. aggregate, density,
HIC pattern, and activity (data not shown). Overall, no negative
impact on product quality was observed following lyophilization and
reconstitution: product appearance, color, visible particle level,
clarity, pH, osmolarity, protein content, monomer content, HIC
pattern, and activity were not significantly altered by the
lyophilization process. Furthermore, reconstitution times for
formulations lyophilized by both cycle 1 (100-140 seconds) and
cycle 2 (100-170 seconds) were acceptable, and measured subvisible
particle levels were below the pharmacopeia specifications.
TABLE-US-00017 TABLE 14 Results of Lyophilization Feasibility
Study, Product Testing Post-Lyophilization For- Mois- Subvisible
Reconstitution mu- Cake ture Particles Time lation Appearance (%)
(per 1 ml) (seconds) Cycle F1 yellow/brown 1.09 43 (.gtoreq.10
.mu.m) 123 1 low shrinkage 1 (.gtoreq.25 .mu.m) F2 yellow/brown
1.77 83 (.gtoreq.10 .mu.m) 97 no shrinkage 4 (.gtoreq.25 .mu.m) F3
yellow/brown 1.48 21 (.gtoreq.10 .mu.m) 139 low shrinkage 1
(.gtoreq.25 .mu.m) F4 yellow/brown 1.94 59 (.gtoreq.10 .mu.m) 104
no shrinkage 1 (.gtoreq.25 .mu.m) Cycle F1 yellow/brown 1.07 236
(.gtoreq.10 .mu.m) 104 2 low shrinkage 4 (.gtoreq.25 .mu.m) F2
yellow/brown 1.68 276 (.gtoreq.10 .mu.m) 104 no shrinkage 8
(.gtoreq.25 .mu.m) F3 yellow/brown 1.32 262 (.gtoreq.10 .mu.m) 166
low shrinkage 3 (.gtoreq.25 .mu.m) F4 yellow/brown 1.62 190
(.gtoreq.10 .mu.m) 173 no shrinkage 5 (.gtoreq.25 .mu.m) best
appearance
[0224] Because of a tendency for lyophilization cycle 2 to result
in longer reconstitution times and slightly higher subvisible
particle levels (2-10 .mu.m) for formulations containing mannitol
and sucrose, a lyophilization cycle based on a revision of cycle 1
was selected for use in an accelerated stability study. The revised
lyophilization cycle included a shorter primary drying phase (step
8) of 40 hours rather than 60 hours, and an extended secondary
drying phase (step 10) of 12 hours rather than 8 hours. The longer
secondary drying phase was included to further reduce moisture
levels in the lyophilized formulations.
[0225] Accelerated Stability Study of Lyophilized Formulations.
[0226] Formulations F1-F4 (as described in Table 10, above) were
lyophilized as described above, except that the lyophilization
cycle shown in Table 15 (below) was used. For the accelerated
stability study, the lyophilized formulations were stored at
40.degree. C., 75% relative humidity (RH), for a period of one,
two, or three months. Following storage, the formulations were
reconstituted with water (5.0 ml) and the characteristics of the
reconstituted formulations were examined and compared to the
characteristics of formulations reconstitute immediately after
lyophilization (the "initial values").
TABLE-US-00018 TABLE 15 Lyophilization Cycle for Accelerated
Stability Study Time Temp Vacuum MKS Step No. (hh:mm) (.degree. C.)
(mbar) Loading 01 - - - 5 Off Freezing 02 01:30 5 Off 05 02:00 -50
Off 06 01:00 -50 Off 07 00:30 -50 Off Primary Drying 08 00:05 -50
0.10 09 01:30 -10 0.10 10 40:00 -10 0.10 Secondary 11 04:00 30 0.10
Drying 12 12:00 30 0.10 Total Time 62:35
[0227] The cake color of the lyophilized formulations was slightly
yellow, consistent with the observations in the lyophilization
feasibility study. The cake appearance in all cases was acceptable,
with the trehalose formulations (F1 & F3) tending to shrink due
to the amorphous character of the lyophilized product (confirmed by
X-ray powder diffraction). The monnitol-containing lyophilized
formulations (F2 & F4) were partially crystalline and showed
essentially no shrinkage. The cake appearance and color of the
formulations did not change over the course of storage for three
months at 40.degree. C.
[0228] The moisture level of the lyophilized formulations prior to
reconstitution did not change significantly after three months at
40.degree. C. Moisture levels for the formulations immediately
after lyophilization ranged from 0.90% to 1.36%; after three
months, they ranged from 0.84% to 1.47%. See Table 16 (below).
Differences in the moisture levels observed in different samples of
the same formulation are attributed to variance in the testing
method. However, formulations containing sucrose and mannitol
consistently contained higher levels of moisture than the
formulations containing trehalose.
TABLE-US-00019 TABLE 16 Moisture Levels of Lyophilized Formulations
Following Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20
mM Citrate Succinate Succinate Citrate 28 mM 230 mM 28 mM Sucrose
230 mM Sucrose Trehalose 212 mM Mannitol Trehalose 212 mM 0.02 0.02
0.02 Mannitol Formu- w % PS20 w % PS20 w % PS20 0.02 w % PS20
lation pH 6.5 pH 6.5 pH 6.0 pH 6.0 Initial 0.90 1.13 1.11 1.36
Value 1 month 0.85 1.18 0.94 1.48 2 months 0.85 1.12 0.68 1.24 3
months 0.84 1.22 0.90 1.47
[0229] Reconstitution times for all of the lyophilized formulations
were acceptable, varying between 49 and 97 seconds. The appearance
of all of the reconstitute formulations was comparable, with no
visible particles observed even after three months at 40.degree. C.
In addition, the color of the formulations remained unchanged
(<BY5) over the same period of time, as compared to the
pre-lyophilized formulations.
[0230] No relevant changes in protein concentration, osmolarity and
pH were observed for any of the formulations after three months at
40.degree. C. (data not shown). However, differential increases in
turbidity were observed. As shown in Table 17 (below), the
mannitol-containing formulations (F2 & F4) exhibited larger
increases in turbidity (6-7 FNU over three months), while the
trehalose-containing formulations (F1 & F3) exhibited smaller
increases (only 2 FNU).
TABLE-US-00020 TABLE 17 Turbidity of Post-Lyophilized Formulations
Following Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20
mM Citrate Succinate Succinate Citrate 28 mM 230 mM 28 mM Sucrose
230 mM Sucrose Trehalose 212 mM Trehalose 212 mM 0.02 w % Mannitol
0.02 w % Mannitol Formu- PS20 0.02 w % PS20 PS20 0.02 w % PS20
lation pH 6.5 pH 6.5 pH 6.0 pH 6.0 Initial Value 14 16 15 16 1
month 14 17 15 16 2 months 14 18 15 18 3 months 16 23 17 22
[0231] Subvisible particles in the reconstituted formulations were
measured by the micro-flow imaging (MFI) method. Two individual
samples were measured per formulation and time point. For
formulations reconstitute right after lyophilization (i.e., without
storage at 40.degree. C.), the levels of sub-visible particles are
shown in Table 18 (below), with a corresponding bar graph shown in
FIG. 3. The levels of sub-visible particles detected in
formulations stored for one month, two months, and three months at
40.degree. C. are shown in Tables 19-21, respectively (see below),
with the corresponding bar graphs shown in FIGS. 4-6,
respectively.
TABLE-US-00021 TABLE 18 MFI Data, Initial Values Following
Lyophilization Particle Size (.mu.m) F1-1 F1-2 F2-1 F2-2 F3-1 F3-2
F4-1 F4-2 .gtoreq.2.00 2340 2730 11470 11545 10375 11285 2820 2280
.gtoreq.10.00 110 70 55 50 70 135 25 0 .gtoreq.25.00 10 30 0 10 10
20 10 0
TABLE-US-00022 TABLE 19 MFI Data, Values Following 1 Month of
Storage at 40.degree. C. Particle Size (.mu.m) F1-1 F1-2 F2-1 F2-2
F3-1 F3-2 F4-1 F4-2 .gtoreq.2.00 12370 12680 232490 218280 7245
7715 184365 176815 .gtoreq.10.00 50 10 28990 33455 130 105 3885
3925 .gtoreq.25.00 0 0 0 2955 0 20 0 0
TABLE-US-00023 TABLE 20 MFI Data, Values Following 2 Months of
Storage at 40.degree. C. Particle Size (.mu.m) F1-1 F1-2 F2-1 F2-2
F3-1 F3-2 F4-1 F4-2 .gtoreq.2.00 32995 38225 0 395570 16615 32445
172010 163020 .gtoreq.10.00 410 1050 0 51030 45 525 9775 8160
.gtoreq.25.00 35 115 0 125 0 75 0 75
TABLE-US-00024 TABLE 21 MFI Data, Values Following 3 Months of
Storage at 40.degree. C. Particle Size (.mu.m) F1-1 F1-2 F2-1 F2-2
F3-1 F3-2 F4-1 F4-2 .gtoreq.2.00 41895 81355 520555 551750 30740
29275 340450 353695 .gtoreq.10.00 285 330 60565 74430 65 55 25150
24760 .gtoreq.25.00 10 0 645 820 0 0 35 55
[0232] The MFI analysis revealed that the subvisible particle
levels in the tested formulations were comparable right after
lyophilization, but that the levels in the mannitol- and
sucrose-containing formulations (F2 and F4) increased dramatically
after one month, and continued increasing thereafter. As a result,
formulation 2 exceeded the Pharmacopeia limits for subvisible
particles greater than or equal to 10 microns (.gtoreq.10.00 .mu.m)
and subvisible particles greater than or equal to 25 microns
(.gtoreq.25.00 .mu.m) after just one month, formulation 4 exceeded
the Pharmacopeia limits for subvisible particles after two months
of storage at 40.degree. C. In contrast, the trehalose-containing
formulations (F1 and F3) did not show a significant increase in
particle formation and remained below Pharmacopeia limits for
subvisible particles for at least three months at 40.degree. C.
[0233] Subvisible particles in the four formulations were also
measured by light obscuration after two months of storage at
40.degree. C. Light obscuration is a technique known to give
differing results than MFI measurements, typically tending to be
lower. As shown in Table 22 (below), formulation 2 has the highest
levels of subvisible particles detected by light obscuration, while
the other formulations has lower, more comparable levels of
subvisible particles.
TABLE-US-00025 TABLE 22 Light Obscuration Data, Values Following 2
Months of Storage at 40.degree. C. F2 F4 F1 20 mM Succinate F3 20
mM Citrate 20 mM Succinate 28 mM Sucrose 20 mM Citrate 28 mM
Sucrose 230 mM Trehalose 212 mM Mannitol 230 mM Trehalose 212 mM
Mannitol 0.02 w % PS20 0.02 w % PS20 0.02 w % PS20 0.02 w % PS20 pH
6.5 pH 6.5 pH 6.0 pH 6.0 Particle .gtoreq.10.00 .gtoreq.25.00
.gtoreq.10.00 .gtoreq.25.00 .gtoreq.10.00 .gtoreq.25.00
.gtoreq.10.00 .gtoreq.25.00 Size (.mu.m) Initial Value 85 5 55 5
275 5 60 0 2 months 115 5 600 5 280 15 100 0
[0234] The formulations were also analyzed by high performance size
exclusion chromatography (HP-SEC) to determine the percentage of
antibody in aggregated and monomeric form following storage at
40.degree. C. in the lyophilized state. As shown in Table 23
(below), the percentage of aggregated antibody increased by 2.5% to
4.4% in the mannitol- and sucrose-containing formulations, while
increasing by only 1.0% to 1.1% in the trehalose-containing
formulations. As the levels of aggregated antibody increased in the
formulations, the percentage of monomeric antibody correspondingly
decreased. See Table 24. A graphical representation of the amount
of monomeric antibody as a function of formulation and time of
storage at 40.degree. C. is shown in FIG. 7.
TABLE-US-00026 TABLE 23 Antibody Aggregation (Percentage) Following
Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20 mM
Citrate Succinate Succinate Citrate 28 mM 230 mM 28 mM Sucrose 230
mM Sucrose Trehalose 212 mM Trehalose 212 mM 0.02 Mannitol 0.02
Mannitol 0.02 w % PS20 0.02 w % PS20 w % PS20 w % PS20 Formulation
pH 6.5 pH 6.5 pH 6.0 pH 6.0 Initial Value 2.4 2.8 2.0 2.2 1 month
2.9 5.0 2.5 3.6 2 months 3.1 6.0 2.8 4.1 3 months 3.4 7.2 3.1
4.7
TABLE-US-00027 TABLE 24 Monomeric Antibody (Percentage) Following
Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20 mM
Citrate Succinate Succinate Citrate 28 mM 230 mM 28 mM Sucrose 230
mM Sucrose Trehalose 212 mM Trehalose 212 mM 0.02 Mannitol 0.02 w %
Mannitol w % PS20 0.02 w % PS20 PS20 0.02 w % PS20 Formulation pH
6.5 pH 6.5 pH 6.0 pH 6.0 Initial Value 96.9 96.4 97.1 97.0 1 month
96.4 94.2 96.7 95.5 2 months 96.1 93.2 96.4 95.1 3 months 95.9 92.1
96.2 94.6
[0235] The formulations were also characterized by hydrophobicity
interaction chromatography (HIC) over the course of their storage
at 40.degree. C. For each formulation, a pre-peak (relatively
hydrophilic), a main peak, and a post-peak (relatively hydrophobic)
can be detected by HIC. Changes in protein structure over time can
be monitored through the changes in the area of each of the peaks
that occurs. The results of the HIC analysis are shown in Tables
25-27 (below). The change in the area of the pre-peak was
comparable for each of the formulations. The changes in the main
peak and the post-peak areas were more significant, differing
between the trehalose-containing and mannitol/sucrose-containing
formulations. In particular, the mannitol/sucrose-containing
formulations (F2 and F4) exhibited 8.4% and 5.4% decreases in main
peak area, respectively, over the three month storage period. In
contrast, the trehalose-containing formulations (F1 and F3)
exhibited 4.7% and 4.5% decreases in main peak area, respectively,
over the same period of time. Most of the protein previously in the
main peak of the mannitol/sucrose-containing formulations shifted
to the hydrophobic post-peak, with the post-peak areas of
formulations F2 and F4 increasing by 6.4% and 4.6%,
respectively.
TABLE-US-00028 TABLE 25 HIC Data, Pre-Peak Area (Percentage)
Following Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20
mM Citrate Succinate Succinate Citrate 28 mM 230 mM 28 mM Sucrose
230 mM Sucrose Trehalose 212 mM Trehalose 212 mM 0.02 w % Mannitol
0.02 w % Mannitol PS20 0.02 w % PS20 PS20 0.02 w % PS20 Formulation
pH 6.5 pH 6.5 pH 6.0 pH 6.0 Initial Value 7.4 7.3 8.3 8.4 1 month
7.6 7.8 9.2 9.5 2 months 7.4 8.1 8.3 8.8 3 months 9.8 9.3 9.9
9.3
TABLE-US-00029 TABLE 26 HIC Data, Main Peak Area (Percentage)
Following Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20
mM Citrate Succinate Succinate Citrate 28 mM Sucrose 230 mM 28 mM
Sucrose 230 mM 212 mM Trehalose 212 mM Trehalose Mannitol 0.02 w %
Mannitol 0.02 0.02 PS20 0.02 w % PS20 w % PS20 w % PS20 Formulation
pH 6.5 pH 6.5 pH 6.0 pH 6.0 Initial Value 87.8 87.7 87.5 87.3 1
month 87.1 85.3 86.0 84.9 2 months 87.1 84.1 86.6 85.3 3 months
83.1 79.3 83.0 81.8
TABLE-US-00030 TABLE 27 HIC Data, Post-Peak Area (Percentage)
Following Storage at 40.degree. C. F1 F2 F3 F4 20 mM 20 mM 20 mM 20
mM Citrate Succinate Succinate Citrate 28 mM 230 mM 28 mM Sucrose
230 mM Sucrose Trehalose 212 mM Trehalose 212 mM 0.02 w % Mannitol
0.02 w % Mannitol PS20 0.02 w % PS20 PS20 0.02 w % PS20 Formulation
pH 6.5 pH 6.5 pH 6.0 pH 6.0 Initial Value 4.7 5.0 4.2 4.3 1 month
5.3 6.9 4.8 5.7 2 months 5.5 7.8 5.0 6.0 3 months 7.1 11.4 7.1
8.9
[0236] The formulations were also characterized by isoelectric
focusing and capillary imaging (iCE). Each of the formulations
displayed three-peak pattern, including an acidic peak, a main
peak, and a basic peak. As shown in Table 28, Formulation 1
displayed the least change in peak pattern during three months of
storage at 40.degree. C., while Formulations 2-4 displayed large
increases in the basic peak area over time.
TABLE-US-00031 TABLE 28 iCE Data Following Storage at 40.degree. C.
Acidic Main Basic Peak Peak Peak Formulation Sample Area Area Area
F1 Initial Value 41.8 53.0 5.2 20 mM Succinate 1 month 41.4 51.5
7.1 230 mM 2 months 39.9 52.5 7.6 Trehalose 3 months 37.0 57.1 5.9
0.02 w % PS20 pH 6.5 F2 Initial Value 40.2 55.3 4.5 20 mM Succinate
1 month 44.9 48.2 6.9 28 mM Sucrose 2 months 48.1 44.9 7.1 212 mM
Mannitol 3 months 40.3 50.3 9.4 0.02 w % PS20 pH 6.5 F3 Initial
Value 39.8 56.4 3.8 20 mM Citrate 1 month 36.4 56.3 7.3 230 mM 2
months 37.5 53.5 9.0 Trehalose 3 months 35.7 55.4 9.0 0.02 w % PS20
pH 6.0 F4 Initial Value 43.0 52.5 4.5 20 mM Citrate 1 month 42.1
49.0 8.9 28 mM Sucrose 2 months 45.3 44.9 9.8 212 mM Mannitol 3
months 34.5 54.7 11.9 0.02 w % PS20 pH 6.0
[0237] The antigen-binding activity of the antibody in each of the
formulations was also examined. The antibody retained high
antigen-binding activity throughout the three months of storage at
40.degree. C., regardless of the formulation.
[0238] The formulations were also tested for aggregate formation
during ultrafiltration/diafiltration (UF/DF processing).
Formulation 3 exhibited the least amount of aggregate formation,
while formulation 2 exhibited the most; formulations 1 and 4
exhibited intermediate amounts of aggregation (data not shown).
[0239] Considering all of the accelerated stability data,
formulations F1 and F3 display a superior stability after 3 months
of storage, as compared to formulations F2 and F4. This is a
reflection of the fact that formulations F2 and F4 (the
mannitol/sucrose-containing formulations) display relatively poor
stability as detected by turbidity, HP-SEC, subvisible particles,
HIC, and iCE. Comparing formulations F1 and F3, one significant
difference is that F1 tends to generate slightly more aggregates
than F3 during ultrafiltration/diafiltration processing. Therefore,
F3 was selected as a preferred formulation.
[0240] Formulation Stability with Respect to Freezing and
Thawing.
[0241] Formulation F3 was next tested for its ability to stabilize
humanized 9E4 antibody with respect to freezing and thawing. To
this end, humanized 9E4 antibody was purified and resuspended in
formulation F3. 20 ml of F3 containing humanized 9E4 at 40 mg/ml
was then filled into Sartorius Stedim Flexboy 30 ml bags, and the
bags were frozen at -40.degree. C. Up to five freeze/thaw cycles
were performed per bag. Analytical testing of the humanized 9E4
antibody in formulation F3 was performed prior to freezing and
after 1, 3 and 5 freeze/thaw cycles. No significant changes were
detected after up to three freeze-thaw cycles. After five
freeeze/thaw cycles, a slight increase in the level of aggregated
antibody (0.2%) was detected and minor changes in the HIC and iCE
patters were observed. All other assay results, including visual
insepection for color and visible particles, clarity, UV scan,
HP-SEC, osmolality, pH, subvisible particle counts, and antibody
activity, did not change after five freeze-thaw cycles.
[0242] Various changes in form and details can be made therein
without departing from the spirit and scope of the invention.
Unless otherwise apparent from the context, any embodiment, aspect,
element, feature, step or the like can be used in combination with
any other. Insofar as information associated with a citation may
change with time, the information associated with the citation at
the earliest effective filing date is meant, the earliest effective
filing date for a citation meaning the filing date of the present
application or earlier priority application disclosing the
citation. All references, issued patents and patent applications
cited within the body of the instant specification are hereby
incorporated by reference in their entirety, for all purposes. Any
embodiment, aspect, feature, element, step or the like can be
combined with any other unless the context indicates otherwise.
When a composition is said to comprise certain specified
components, the application should be read unless the context
requires otherwise as disclosing that in the alternative, the
composition may consist of or consist essentially of the specified
components. For example, when an antibody chain is said to have an
amino acid sequence comprising a specified SEQ ID NO., it should be
understood unless the context requires otherwise that alternatively
the antibody chain can consist of or consist essentially of the SEQ
ID NO.
Sequence CWU 1
1
331113PRTArtificial SequenceSynthesized 1Asp Ile Val Met Ser Gln
Ser Pro Ser Ser Leu Ala Val Ser Val Gly1 5 10 15Glu Lys Val Thr Met
Ser Cys Lys Ser Ile Gln Thr Leu Leu Tyr Ser 20 25 30Ser Asn Gln Lys
Asn Tyr Leu Ala Trp Phe Gln Gln Lys Pro Gly Gln 35 40 45Ser Pro Lys
Leu Leu Ile Tyr Trp Ala Ser Ile Arg Lys Ser Gly Val 50 55 60Pro Asp
Arg Phe Thr Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr65 70 75
80Ile Ser Ser Val Lys Ala Glu Asp Leu Ala Val Tyr Tyr Cys Gln Gln
85 90 95Tyr Tyr Ser Tyr Pro Leu Thr Phe Gly Ala Gly Thr Lys Leu Glu
Leu 100 105 110Lys2107PRTArtificial SequenceSynthesized 2Asp 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 Ser Ile Ser Ser Tyr 20 25
30Leu Asn Trp Tyr Gln Gln Lys Pro Gly Lys Ala Pro Lys Leu Leu Ile
35 40 45Tyr Ala Ala Ser Ser Leu Gln Ser Gly Val Pro Ser Arg Phe Ser
Gly 50 55 60Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr Ile Ser Ser Leu
Gln Pro65 70 75 80Glu Asp Phe Ala Thr Tyr Tyr Cys Gln Gln Ser Tyr
Ser Thr Pro Leu 85 90 95Thr Phe Gly Gly Gly Thr Lys Leu Glu Ile Lys
100 1053113PRTArtificial SequenceSynthesized 3Asp Ile Gln Met Thr
Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp Arg Val Thr
Ile Thr Cys Lys Ser Ile Gln Thr Leu Leu Tyr Ser 20 25 30Ser Asn Gln
Lys Asn Tyr Leu Ala Trp Phe Gln Gln Lys Pro Gly Lys 35 40 45Ala Pro
Lys Leu Leu Ile Tyr Trp Ala Ser Ile Arg Lys Ser Gly Val 50 55 60Pro
Ser Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr65 70 75
80Ile Ser Ser Leu Gln Pro Glu Asp Phe Ala Thr Tyr Tyr Cys Gln Gln
85 90 95Tyr Tyr Ser Tyr Pro Leu Thr Phe Gly Gly Gly Thr Lys Leu Glu
Ile 100 105 110Lys4113PRTArtificial SequenceSynthesized 4Asp Ile
Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp
Arg Val Thr Ile Thr Cys Lys Ser Ile Gln Thr Leu Leu Tyr Ser 20 25
30Ser Asn Gln Lys Asn Tyr Leu Ala Trp Tyr Gln Gln Lys Pro Gly Lys
35 40 45Ala Pro Lys Leu Leu Ile Tyr Trp Ala Ser Ile Arg Lys Ser Gly
Val 50 55 60Pro Ser Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr
Leu Thr65 70 75 80Ile Ser Ser Leu Gln Pro Glu Asp Phe Ala Thr Tyr
Tyr Cys Gln Gln 85 90 95Tyr Tyr Ser Tyr Pro Leu Thr Phe Gly Gly Gly
Thr Lys Leu Glu Ile 100 105 110Lys5113PRTArtificial
SequenceSynthesized 5Asp Ile Gln Met Thr Gln Ser Pro Ser Ser Leu
Ser Ala Ser Val Gly1 5 10 15Asp Arg Val Thr Ile Thr Cys Lys Ser Ile
Gln Thr Leu Leu Tyr Ser 20 25 30Ser Asn Gln Lys Asn Tyr Leu Ala Trp
Phe Gln Gln Lys Pro Gly Lys 35 40 45Ala Pro Lys Leu Leu Ile Tyr Trp
Ala Ser Ile Arg Lys Ser Gly Val 50 55 60Pro Ser Arg Phe Ser Gly Ser
Gly Ser Gly Thr Asp Phe Thr Leu Thr65 70 75 80Ile Ser Ser Leu Gln
Pro Glu Asp Leu Ala Thr Tyr Tyr Cys Gln Gln 85 90 95Tyr Tyr Ser Tyr
Pro Leu Thr Phe Gly Gly Gly Thr Lys Leu Glu Ile 100 105
110Lys6116PRTArtificial SequenceSynthesized 6Glu Val Lys Leu Val
Glu Ser Gly Gly Gly Leu Val Lys Pro Gly Ala1 5 10 15Ser Leu Lys Leu
Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met Ser
Trp Val Arg Gln Thr Ser Asp Lys Arg Leu Glu Trp Val 35 40 45Ala Ser
Ile Ser Ser Gly Gly Gly Ser Thr Tyr Tyr Pro Asp Asn Val 50 55 60Lys
Gly Arg Phe Thr Ile Ser Arg Glu Asp Ala Lys Asn Thr Leu Tyr65 70 75
80Leu Gln Met Ser Ser Leu Arg Ser Glu Asp Thr Ala Leu Tyr Tyr Cys
85 90 95Ser Arg Gly Gly Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr Thr
Leu 100 105 110Thr Val Ser Ser 1157116PRTArtificial
SequenceSynthesized 7Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu
Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly
Phe Thr Phe Ser Ser Tyr 20 25 30Trp Met Ser Trp Val Arg Gln Ala Pro
Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Asn Ile Lys Gln Asp Gly Ser
Glu Lys Tyr Tyr Val Asp Ser Val 50 55 60Lys Gly Arg Phe Thr Ile Ser
Arg Asp Asn Ala Lys Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser
Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Ser
Ser Asp Met Asp Tyr Trp Gly Gln Gly Thr Leu Val 100 105 110Thr Val
Ser Ser 1158116PRTArtificial SequenceSynthesized 8Glu Val Gln Leu
Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg
Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met
Ser Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala
Ser Ile Ser Ser Gly Gly Gly Ser Thr Tyr Tyr Pro Asp Asn Val 50 55
60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Ser Leu Tyr65
70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr
Cys 85 90 95Ser Arg Gly Gly Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr
Leu Val 100 105 110Thr Val Ser Ser 1159116PRTArtificial
SequenceSynthesized 9Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu
Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly
Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met Ser Trp Val Arg Gln Ala Pro
Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Ser Ile Ser Ser Gly Gly Gly
Ser Thr Tyr Tyr Pro Asp Asn Val 50 55 60Lys Gly Arg Phe Thr Ile Ser
Arg Asp Asn Ala Lys Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser
Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ser Arg Gly Gly
Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr Leu Val 100 105 110Thr Val
Ser Ser 11510116PRTArtificial SequenceSynthesized 10Glu Val Gln Leu
Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg
Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met
Ser Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala
Ser Ile Ser Ser Gly Gly Gly Ser Thr Tyr Tyr Pro Asp Asn Val 50 55
60Lys Gly Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Ser Leu Tyr65
70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr
Cys 85 90 95Ala Arg Gly Gly Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr
Leu Val 100 105 110Thr Val Ser Ser 11511116PRTArtificial
SequenceSynthesized 11Glu Val Gln Leu Val Glu Ser Gly Gly Gly Leu
Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly
Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met Ser Trp Val Arg Gln Ala Pro
Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Ser Ile Ser Ser Gly Gly Gly
Ser Thr Tyr Tyr Pro Asp Asn Val 50 55 60Lys Gly Arg Phe Thr Ile Ser
Arg Asp Asn Ala Lys Asn Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser
Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys 85 90 95Ala Arg Gly Gly
Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr Leu Val 100 105 110Thr Val
Ser Ser 11512140PRTArtificial SequenceSynthesized 12Met Asp Val Phe
Met Lys Gly Leu Ser Lys Ala Lys Glu Gly Val Val1 5 10 15Ala Ala Ala
Glu Lys Thr Lys Gln Gly Val Ala Glu Ala Ala Gly Lys 20 25 30Thr Lys
Glu Gly Val Leu Tyr Val Gly Ser Lys Thr Lys Glu Gly Val 35 40 45Val
His Gly Val Ala Thr Val Ala Glu Lys Thr Lys Glu Gln Val Thr 50 55
60Asn Val Gly Gly Ala Val Val Thr Gly Val Thr Ala Val Ala Gln Lys65
70 75 80Thr Val Glu Gly Ala Gly Ser Ile Ala Ala Ala Thr Gly Phe Val
Lys 85 90 95Lys Asp Gln Leu Gly Lys Asn Glu Glu Gly Ala Pro Gln Glu
Gly Ile 100 105 110Leu Glu Asp Met Pro Val Asp Pro Asp Asn Glu Ala
Tyr Glu Met Pro 115 120 125Ser Glu Glu Gly Tyr Gln Asp Tyr Glu Pro
Glu Ala 130 135 14013107PRTArtificial SequenceSynthesized 13Arg 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 10514330PRTArtificial SequenceSynthesized 14Ala Ser Thr Lys Gly
Pro Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly
Gly Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu
Pro Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val
His Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu
Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75
80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys
85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro
Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu
Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr
Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp
Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu
Val His Asn Val Lys Thr Lys Pro Arg Glu 165 170 175Glu Gln Tyr Asn
Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu 180 185 190His Gln
Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn 195 200
205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr Pro Pro
Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser Lys Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295 300Val Phe Ser
Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr305 310 315
320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325
33015339DNAArtificial SequenceSynthesized 15gacatccaga tgacccagtc
cccctcctcc ctgtccgcct ccgtgggcga ccgcgtgacc 60atcacctgca agtccatcca
gaccctgctg tactcctcca accagaagaa ctacctggcc 120tggttccagc
agaagcccgg caaggccccc aagctgctga tctactgggc ctccatccgc
180aagtccggcg tgccctcccg cttctccggc tccggctccg gcaccgactt
caccctgacc 240atctcctccc tgcagcccga ggacttcgcc acctactact
gccagcagta ctactcctac 300cccctgacct tcggcggcgg caccaagctg gagatcaag
33916339DNAArtificial SequenceSynthesized 16gacatccaga tgacccagtc
cccctcctcc ctgtccgcct ccgtgggcga ccgcgtgacc 60atcacctgca agtccatcca
gaccctgctg tactcctcca accagaagaa ctacctggcc 120tggtaccagc
agaagcccgg caaggccccc aagctgctga tctactgggc ctccatccgc
180aagtccggcg tgccctcccg cttctccggc tccggctccg gcaccgactt
caccctgacc 240atctcctccc tgcagcccga ggacttcgcc acctactact
gccagcagta ctactcctac 300cccctgacct tcggcggcgg caccaagctg gagatcaag
33917339DNAArtificial SequenceSynthesized 17gacatccaga tgacccagtc
cccctcctcc ctgtccgcct ccgtgggcga ccgcgtgacc 60atcacctgca agtccatcca
gaccctgctg tactcctcca accagaagaa ctacctggcc 120tggttccagc
agaagcccgg caaggccccc aagctgctga tctactgggc ctccatccgc
180aagtccggcg tgccctcccg cttctccggc tccggctccg gcaccgactt
caccctgacc 240atctcctccc tgcagcccga ggacctggcc acctactact
gccagcagta ctactcctac 300cccctgacct tcggcggcgg caccaagctg gagatcaag
33918348DNAArtificial SequenceSynthesized 18gaggtgcagc tggtggagtc
cggcggcggc ctggtgcagc ccggcggctc cctgcgcctg 60tcctgcgccg cctccggctt
caccttctcc aactacggca tgtcctgggt gcgccaggcc 120cccggcaagg
gcctggagtg ggtggcctcc atctcctccg gcggcggctc cacctactac
180cccgacaacg tgaagggccg cttcaccatc tcccgcgacg acgccaagaa
ctccctgtac 240ctgcagatga actccctgcg cgccgaggac accgccgtgt
actactgctc ccgcggcggc 300gccggcatcg actactgggg ccagggcacc
ctggtgaccg tgtcctcc 34819348DNAArtificial SequenceSynthesized
19gaggtgcagc tggtggagtc cggcggcggc ctggtgcagc ccggcggctc cctgcgcctg
60tcctgcgccg cctccggctt caccttctcc aactacggca tgtcctgggt gcgccaggcc
120cccggcaagg gcctggagtg ggtggcctcc atctcctccg gcggcggctc
cacctactac 180cccgacaacg tgaagggccg cttcaccatc tcccgcgaca
acgccaagaa ctccctgtac 240ctgcagatga actccctgcg cgccgaggac
accgccgtgt actactgctc ccgcggcggc 300gccggcatcg actactgggg
ccagggcacc ctggtgaccg tgtcctcc 34820348DNAArtificial
SequenceSynthesized 20gaggtgcagc tggtggagtc cggcggcggc ctggtgcagc
ccggcggctc cctgcgcctg 60tcctgcgccg cctccggctt caccttctcc aactacggca
tgtcctgggt gcgccaggcc 120cccggcaagg gcctggagtg ggtggcctcc
atctcctccg gcggcggctc cacctactac 180cccgacaacg tgaagggccg
cttcaccatc tcccgcgacg acgccaagaa ctccctgtac 240ctgcagatga
actccctgcg cgccgaggac accgccgtgt actactgcgc ccgcggcggc
300gccggcatcg actactgggg ccagggcacc ctggtgaccg tgtcctcc
34821348DNAArtificial SequenceSynthesized 21gaggtgcagc tggtggagtc
cggcggcggc ctggtgcagc ccggcggctc cctgcgcctg 60tcctgcgccg cctccggctt
caccttctcc aactacggca tgtcctgggt gcgccaggcc 120cccggcaagg
gcctggagtg ggtggcctcc atctcctccg gcggcggctc cacctactac
180cccgacaacg tgaagggccg cttcaccatc tcccgcgaca acgccaagaa
ctccctgtac 240ctgcagatga actccctgcg cgccgaggac accgccgtgt
actactgcgc ccgcggcggc 300gccggcatcg actactgggg ccagggcacc
ctggtgaccg tgtcctcc 3482222PRTArtificial SequenceSynthesized 22Met
Asp Met Arg Val Pro Ala Gln Leu Leu Gly Leu Leu Met Leu Trp1 5 10
15Val Ser Gly Ser Ser Gly 202366DNAArtificial SequenceSynthesized
23atggacatgc gcgtgcccgc ccagctgctg ggcctgctga tgctgtgggt gtccggctcc
60tccggc 662419PRTArtificial SequenceSynthesized 24Met Glu Phe Gly
Leu Ser Trp Leu Phe Leu Val Ala Ile Leu Lys Gly1 5 10 15Val Gln
Cys2557DNAArtificial SequenceSynthesized 25atggagttcg gcctgtcctg
gctgttcctg gtggccatcc tgaagggcgt gcagtgc 5726113PRTArtificial
SequenceSynthesizedVARIANT42Xaa = Y or FVARIANT89Xaa = F or L 26Asp
Ile Gln Met Thr Gln Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5
10 15Asp Arg Val Thr Ile Thr Cys Lys Ser Ile Gln Thr Leu Leu Tyr
Ser 20 25 30Ser Asn Gln Lys Asn Tyr Leu Ala Trp Xaa Gln Gln Lys Pro
Gly Lys 35 40 45Ala Pro Lys Leu Leu Ile Tyr Trp Ala Ser Ile Arg Lys
Ser Gly Val 50 55 60Pro Ser Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp
Phe Thr Leu Thr65 70 75 80Ile Ser Ser Leu Gln Pro Glu Asp Xaa Ala
Thr Tyr Tyr Cys Gln Gln 85 90 95Tyr Tyr Ser Tyr Pro Leu Thr Phe Gly
Gly Gly Thr Lys Leu Glu Ile 100 105 110Lys27116PRTArtificial
SequenceSynthesizedVARIANT74Xaa = N or DVARIANT97Xaa = A or S 27Glu
Val Gln Leu Val Glu Ser Gly Gly Gly Leu Val Gln Pro Gly Gly1 5 10
15Ser Leu Arg Leu Ser Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr
20 25 30Gly Met Ser Trp Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp
Val 35 40 45Ala Ser Ile Ser Ser Gly Gly Gly Ser Thr Tyr Tyr Pro Asp
Asn Val 50 55 60Lys Gly Arg Phe Thr Ile Ser Arg Asp Xaa Ala Lys Asn
Ser Leu Tyr65 70 75 80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr
Ala Val Tyr Tyr Cys 85 90 95Xaa Arg Gly Gly Ala Gly Ile Asp Tyr Trp
Gly Gln Gly Thr Leu Val 100 105 110Thr Val Ser Ser
11528106PRTArtificial SequenceSynthesized 28Thr Val Ala Ala Pro Ser
Val Phe Ile Phe Pro Pro Ser Asp Glu Gln1 5 10 15Leu Lys Ser Gly Thr
Ala Ser Val Val Cys Leu Leu Asn Asn Phe Tyr 20 25 30Pro Arg Glu Ala
Lys Val Gln Trp Lys Val Asp Asn Ala Leu Gln Ser 35 40 45Gly Asn Ser
Gln Glu Ser Val Thr Glu Gln Asp Ser Lys Asp Ser Thr 50 55 60Tyr Ser
Leu Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu Lys65 70 75
80His Lys Val Tyr Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser Pro
85 90 95Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 100
10529220PRTArtificial SequenceSynthesized 29Asp Ile Gln Met Thr Gln
Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp Arg Val Thr Ile
Thr Cys Lys Ser Ile Gln Thr Leu Leu Tyr Ser 20 25 30Ser Asn Gln Lys
Asn Tyr Leu Ala Trp Phe Gln Gln Lys Pro Gly Lys 35 40 45Ala Pro Lys
Leu Leu Ile Tyr Trp Ala Ser Ile Arg Lys Ser Gly Val 50 55 60Pro Ser
Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr65 70 75
80Ile Ser Ser Leu Gln Pro Glu Asp Leu Ala Thr Tyr Tyr Cys Gln Gln
85 90 95Tyr Tyr Ser Tyr Pro Leu Thr Phe Gly Gly Gly Thr Lys Leu Glu
Ile 100 105 110Lys Arg Thr Val Ala Ala Pro Ser Val Phe Ile Phe Pro
Pro Ser Asp 115 120 125Glu Gln Leu Lys Ser Gly Thr Ala Ser Val Val
Cys Leu Leu Asn Asn 130 135 140Phe Tyr Pro Arg Glu Ala Lys Val Gln
Trp Lys Val Asp Asn Ala Leu145 150 155 160Gln Ser Gly Asn Ser Gln
Glu Ser Val Thr Glu Gln Asp Ser Lys Asp 165 170 175Ser Thr Tyr Ser
Leu Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr 180 185 190Glu Lys
His Lys Val Tyr Ala Cys Glu Val Thr His Gln Gly Leu Ser 195 200
205Ser Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 210 215
22030219PRTArtificial SequenceSynthesized 30Asp Ile Gln Met Thr Gln
Ser Pro Ser Ser Leu Ser Ala Ser Val Gly1 5 10 15Asp Arg Val Thr Ile
Thr Cys Lys Ser Ile Gln Thr Leu Leu Tyr Ser 20 25 30Ser Asn Gln Lys
Asn Tyr Leu Ala Trp Phe Gln Gln Lys Pro Gly Lys 35 40 45Ala Pro Lys
Leu Leu Ile Tyr Trp Ala Ser Ile Arg Lys Ser Gly Val 50 55 60Pro Ser
Arg Phe Ser Gly Ser Gly Ser Gly Thr Asp Phe Thr Leu Thr65 70 75
80Ile Ser Ser Leu Gln Pro Glu Asp Leu Ala Thr Tyr Tyr Cys Gln Gln
85 90 95Tyr Tyr Ser Tyr Pro Leu Thr Phe Gly Gly Gly Thr Lys Leu Glu
Ile 100 105 110Lys Thr Val Ala Ala Pro Ser Val Phe Ile Phe Pro Pro
Ser Asp Glu 115 120 125Gln Leu Lys Ser Gly Thr Ala Ser Val Val Cys
Leu Leu Asn Asn Phe 130 135 140Tyr Pro Arg Glu Ala Lys Val Gln Trp
Lys Val Asp Asn Ala Leu Gln145 150 155 160Ser Gly Asn Ser Gln Glu
Ser Val Thr Glu Gln Asp Ser Lys Asp Ser 165 170 175Thr Tyr Ser Leu
Ser Ser Thr Leu Thr Leu Ser Lys Ala Asp Tyr Glu 180 185 190Lys His
Lys Val Tyr Ala Cys Glu Val Thr His Gln Gly Leu Ser Ser 195 200
205Pro Val Thr Lys Ser Phe Asn Arg Gly Glu Cys 210
21531446PRTArtificial SequenceSynthesized 31Glu Val Gln Leu Val Glu
Ser Gly Gly Gly Leu Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg Leu Ser
Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met Ser Trp
Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Ser Ile
Ser Ser Gly Gly Gly Ser Thr Tyr Tyr Pro Asp Asn Val 50 55 60Lys Gly
Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Ser Leu Tyr65 70 75
80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys
85 90 95Ala Arg Gly Gly Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr Leu
Val 100 105 110Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala 115 120 125Pro Ser Ser Lys Ser Thr Ser Gly Gly Thr Ala
Ala Leu Gly Cys Leu 130 135 140Val Lys Asp Tyr Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly145 150 155 160Ala Leu Thr Ser Gly Val
His Thr Phe Pro Ala Val Leu Gln Ser Ser 165 170 175Gly Leu Tyr Ser
Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu 180 185 190Gly Thr
Gln Thr Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr 195 200
205Lys Val Asp Lys Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr
210 215 220Cys Pro Pro Cys Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser
Val Phe225 230 235 240Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met
Ile Ser Arg Thr Pro 245 250 255Glu Val Thr Cys Val Val Val Asp Val
Ser His Glu Asp Pro Glu Val 260 265 270Lys Phe Asn Trp Tyr Val Asp
Gly Val Glu Val His Asn Val Lys Thr 275 280 285Lys Pro Arg Glu Glu
Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val 290 295 300Leu Thr Val
Leu His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys305 310 315
320Lys Val Ser Asn Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser
325 330 335Lys Ala Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu
Pro Pro 340 345 350Ser Arg Glu Glu Met Thr Lys Asn Gln Val Ser Leu
Thr Cys Leu Val 355 360 365Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val
Glu Trp Glu Ser Asn Gly 370 375 380Gln Pro Glu Asn Asn Tyr Lys Thr
Thr Pro Pro Val Leu Asp Ser Asp385 390 395 400Gly Ser Phe Phe Leu
Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp 405 410 415Gln Gln Gly
Asn Val Phe Ser Cys Ser Val Met His Glu Ala Leu His 420 425 430Asn
His Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 435 440
44532446PRTArtificial SequenceSynthesized 32Glu Val Gln Leu Val Glu
Ser Gly Gly Gly Leu Val Gln Pro Gly Gly1 5 10 15Ser Leu Arg Leu Ser
Cys Ala Ala Ser Gly Phe Thr Phe Ser Asn Tyr 20 25 30Gly Met Ser Trp
Val Arg Gln Ala Pro Gly Lys Gly Leu Glu Trp Val 35 40 45Ala Ser Ile
Ser Ser Gly Gly Gly Ser Thr Tyr Tyr Pro Asp Asn Val 50 55 60Lys Gly
Arg Phe Thr Ile Ser Arg Asp Asp Ala Lys Asn Ser Leu Tyr65 70 75
80Leu Gln Met Asn Ser Leu Arg Ala Glu Asp Thr Ala Val Tyr Tyr Cys
85 90 95Ala Arg Gly Gly Ala Gly Ile Asp Tyr Trp Gly Gln Gly Thr Leu
Val 100 105 110Thr Val Ser Ser Ala Ser Thr Lys Gly Pro Ser Val Phe
Pro Leu Ala 115 120 125Pro Ser Ser Lys Ser Thr Ser Gly Gly Thr Ala
Ala Leu Gly Cys Leu 130 135 140Val Lys Asp Tyr Phe Pro Glu Pro Val
Thr Val Ser Trp Asn Ser Gly145 150 155 160Ala Leu Thr Ser Gly Val
His Thr Phe Pro Ala Val Leu Gln Ser Ser 165 170 175Gly Leu Tyr Ser
Leu Ser Ser Val Val Thr Val Pro Ser Ser Ser Leu 180 185 190Gly Thr
Gln Thr Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr 195 200
205Lys Val Asp Lys Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr
210 215 220Cys Pro Pro Cys Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser
Val Phe225 230 235 240Leu Phe Pro Pro Lys Pro Lys Asp Thr Leu Met
Ile Ser Arg Thr Pro 245 250 255Glu Val Thr Cys Val Val Val Asp Val
Ser His Glu Asp Pro Glu Val 260 265 270Lys Phe Asn Trp Tyr Val Asp
Gly Val Glu Val His Asn Ala Lys Thr 275 280 285Lys Pro Arg Glu Glu
Gln Tyr Asn Ser Thr Tyr Arg Val Val Ser Val 290 295 300Leu Thr Val
Leu His Gln Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys305 310 315
320Lys Val Ser Asn Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser
325 330 335Lys Ala Lys Gly Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu
Pro Pro 340 345 350Ser Arg Glu Glu Met Thr Lys Asn Gln Val Ser Leu
Thr Cys Leu Val 355 360 365Lys Gly Phe Tyr Pro Ser Asp Ile Ala Val
Glu Trp Glu Ser Asn Gly 370 375 380Gln Pro Glu Asn Asn Tyr Lys Thr
Thr Pro Pro Val Leu Asp Ser Asp385 390 395 400Gly Ser Phe Phe Leu
Tyr Ser Lys Leu Thr Val Asp Lys Ser Arg Trp 405 410 415Gln Gln Gly
Asn Val Phe Ser Cys Ser Val Met His Glu Ala Leu His 420 425 430Asn
His Tyr Thr Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 435 440
44533330PRTArtificial SequenceSynthesized 33Ala Ser Thr Lys Gly Pro
Ser Val Phe Pro Leu Ala Pro Ser Ser Lys1 5 10 15Ser Thr Ser Gly Gly
Thr Ala Ala Leu Gly Cys Leu Val Lys Asp Tyr 20 25 30Phe Pro Glu Pro
Val Thr Val Ser Trp Asn Ser Gly Ala Leu Thr Ser 35 40 45Gly Val His
Thr Phe Pro Ala Val Leu Gln Ser Ser Gly Leu Tyr Ser 50 55 60Leu Ser
Ser Val Val Thr Val Pro Ser Ser Ser Leu Gly Thr Gln Thr65 70 75
80Tyr Ile Cys Asn Val Asn His Lys Pro Ser Asn Thr Lys Val Asp Lys
85 90 95Arg Val Glu Pro Lys Ser Cys Asp Lys Thr His Thr Cys Pro Pro
Cys 100 105 110Pro Ala Pro Glu Leu Leu Gly Gly Pro Ser Val Phe Leu
Phe Pro Pro 115 120 125Lys Pro Lys Asp Thr Leu Met Ile Ser Arg Thr
Pro Glu Val Thr Cys 130 135 140Val Val Val Asp Val Ser His Glu Asp
Pro Glu Val Lys Phe Asn Trp145 150 155 160Tyr Val Asp Gly Val Glu
Val His Asn Ala Lys Thr Lys Pro Arg Glu 165 170 175Glu Gln Tyr Asn
Ser Thr Tyr Arg Val Val Ser Val Leu Thr Val Leu 180 185 190His Gln
Asp Trp Leu Asn Gly Lys Glu Tyr Lys Cys Lys Val Ser Asn 195 200
205Lys Ala Leu Pro Ala Pro Ile Glu Lys Thr Ile Ser Lys Ala Lys Gly
210 215 220Gln Pro Arg Glu Pro Gln Val Tyr Thr Leu Pro Pro Ser Arg
Glu Glu225 230 235 240Met Thr Lys Asn Gln Val Ser Leu Thr Cys Leu
Val Lys Gly Phe Tyr 245 250 255Pro Ser Asp Ile Ala Val Glu Trp Glu
Ser Asn Gly Gln Pro Glu Asn 260 265 270Asn Tyr Lys Thr Thr Pro Pro
Val Leu Asp Ser Asp Gly Ser Phe Phe 275 280 285Leu Tyr Ser Lys Leu
Thr Val Asp Lys Ser Arg Trp Gln Gln Gly Asn 290 295 300Val Phe Ser
Cys Ser Val Met His Glu Ala Leu His Asn His Tyr Thr305 310 315
320Gln Lys Ser Leu Ser Leu Ser Pro Gly Lys 325 330
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