WO1999055369A1 - Monoclonal antibodies with reduced immunogenicity - Google Patents
Monoclonal antibodies with reduced immunogenicity Download PDFInfo
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- WO1999055369A1 WO1999055369A1 PCT/US1999/009131 US9909131W WO9955369A1 WO 1999055369 A1 WO1999055369 A1 WO 1999055369A1 US 9909131 W US9909131 W US 9909131W WO 9955369 A1 WO9955369 A1 WO 9955369A1
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- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2839—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily
- C07K16/2848—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against the integrin superfamily against integrin beta3-subunit-containing molecules, e.g. CD41, CD51, CD61
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
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- C07K16/00—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies
- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/24—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against cytokines, lymphokines or interferons
- C07K16/244—Interleukins [IL]
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- C07K16/18—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans
- C07K16/28—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants
- C07K16/2863—Immunoglobulins [IGs], e.g. monoclonal or polyclonal antibodies against material from animals or humans against receptors, cell surface antigens or cell surface determinants against receptors for growth factors, growth regulators
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- C07K2317/00—Immunoglobulins specific features
- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
- C07K2317/21—Immunoglobulins specific features characterized by taxonomic origin from primates, e.g. man
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- C07K2317/20—Immunoglobulins specific features characterized by taxonomic origin
- C07K2317/24—Immunoglobulins specific features characterized by taxonomic origin containing regions, domains or residues from different species, e.g. chimeric, humanized or veneered
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- C07K2317/50—Immunoglobulins specific features characterized by immunoglobulin fragments
- C07K2317/56—Immunoglobulins specific features characterized by immunoglobulin fragments variable (Fv) region, i.e. VH and/or VL
- C07K2317/567—Framework region [FR]
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Definitions
- This invention relates to monoclonal antibodies ( Abs) having reduced immunogenicity in humans .
- Non-human mAbs contain substantial stretches of amino acid sequences that will be immunogenic when injected into a human patient. It is well known that after injection of a foreign antibody, such as a murine antibody, a patient can have a strong human anti-mouse antibody (HAMA) response that essentially eliminates the antibody's therapeutic utility after the initial treatment as well as the utility of any other subsequently administered murine antibody.
- HAMA human anti-mouse antibody
- CDR grafting In general, these methods depend on replacing human variable heavy and light region complementarity determining regions (CDRs) with antigen specific non-human CDRs, a process known as CDR grafting. It is also well known that in CDR grafting experiments the retention of the original antigen binding affinity is enhanced and in many cases depends on choosing human acceptor framework regions that most closely match the corresponding frameworks of the CDR donor antibody. However, since the human genome contains a limited repertoire of heavy and light chain framework regions, these methods suffer from the limitation of available human acceptor frameworks. This restriction in acceptor framework repertoire necessarily can limit the degree of match between the non-human donor and the human acceptor antibody. Thus, CDR grafting methods are limited by the known available repertoire of human VH and VL framework regions. Clearly, a need exists for an expanded range of acceptor V regions.
- One aspect of the present invention is an antibody comprising donor CDRs derived from an antigen-specific donor antibody of a non-human species and acceptor framework residues derived from a non-human primate.
- Another aspect of the invention is a method for making an antibody having reduced immunogenicity in humans comprising grafting CDRs from antigen-specific non-human antibodies onto homologous non-human primate acceptor frameworks .
- Another aspect of the invention is a chimpanzee VH acceptor framework I, II and III comprising an amino acid sequence as set forth in SEQ ID NOs: 10, 11, 12, 13, 14, 15, 16, 17 or 18.
- Another aspect of the invention is a chimpanzee VH acceptor framework IV comprising an amino acid sequence as set forth in SEQ ID NOs: 81, 82, 83, 84 or 85.
- Another aspect of the invention is a chimpanzee VK acceptor framework I, II and III comprising an amino acid sequence as set forth in SEQ ID NOs: 28, 29, 30, 31, 32, 33, 34, 35 or 36.
- Another aspect of the invention is a chimpanzee VK acceptor framework IV comprising an amino acid sequence as set forth in SEQ ID NOs: 86 or 87.
- Another aspect of the invention is a cynomolgus VH acceptor framework I, II and III comprising an amino acid sequence as set forth in SEQ ID NOs: 45, 46, 47, 48, 49, 50, 51 or 52.
- Another aspect of the invention is a cynomolgus VH acceptor framework IV comprising an amino acid sequence as set forth in SEQ ID NOs: 88, 89, 90, 91, 92 or 93.
- Another aspect of the invention is a cynomolgus VK acceptor framework I, II and III comprising an amino acid sequence as set forth in SEQ ID NOs: 59, 60, 61, 62, 63 or Another aspect of the invention is a cynomolgus VK acceptor framework IV comprising an amino acid sequence as set forth in SEQ ID NOs: 94, 95 or 96.
- Yet another aspect of the invention is an isolated nucleic acid molecule encoding the amino acid sequence of SEQ ID NOs: 10, 11, 12, 13, 14, 15, 16, 17, 18, 28, 29, 30, 31, 32, 33, 34, 35 or 36.
- Yet another aspect of the invention is an isolated nucleic acid molecule encoding the amino acid sequence of SEQ ID NOs: 81, 82, 83, 84, 85, 86 or 87.
- Figure 1 is an amino acid sequence of the engineered 4A6 VL region. Asterisks above the 4A6 sequence indicate the 4A6 framework residues retained in the engineered molecule. Bold and italicized letters indicate the CDRs.
- Figure 2 is an amino acid sequence of the engineered 4A6 VH region. Asterisks above the 4A6 sequence indicate the 4A6 framework residues retained in the engineered molecule. Bold and italicized letters indicate the CDRs.
- Figure 3 is an amino acid sequence alignment comparing the murine antibody B9VK with the closest matching chimpanzee VK and selected JK sequences.
- the CDR regions are indicated by bold and italicized letters. Gaps are indicated by dots.
- the numbering convention is from Rabat et al . , infra .
- Figure 4 is an amino acid sequence alignment comparing the murine antibody B9VH with the closest matching chimpanzee VH and selected JH sequences.
- the CDR regions are indicated by bold and italicized letters. Gaps are indicated by dots.
- Asterisks indicate framework residues that are predicted to interact with CDRs and affect antigen binding affinity. The numbering convention is from Rabat et al . , infra .
- Figure 5 is an amino acid sequence alignment comparing the murine antibody 3G9VK with the closest matching chimpanzee VK and selected Jk sequences .
- the CDR regions are indicated by bold and italicized letters.
- Gaps are indicated by dots.
- Asterisks indicate framework residues that are predicted to interact with CDRs and affect antigen binding affinity. The numbering convention is from Rabat et al . , infra .
- Figure 6 is an amino acid sequence alignment comparing the murine antibody 3G9VH with the closest matching chimpanzee VH and selected JH sequences.
- the CDR regions are indicated by bold and italicized letters. Gaps are indicated by dots .
- Asterisks indicate framework residues that are predicted to interact with CDRs and affect antigen binding affinity. The numbering convention is from Rabat efc al . , infra .
- antibodies are heterodimers comprised of at least two heavy and two light chains.
- the N-terminal domain of each heavy and light chain termed VH and VL, respectively, fold together to form the antigen combining site.
- VH and VL The N-terminal domain of each heavy and light chain, termed VH and VL, respectively, fold together to form the antigen combining site.
- VK or VI The N-terminal domain of each heavy and light chain
- JK or JI fold together to form one continuous VL region.
- the VH domain is encoded by three gene segments, VH, DH, and JH, that join together to form one continuous VH region.
- VL and VH regions may be encoded by different combinations of VK or VI, JK or Jl and VH, DH, and JH.
- This combinatorial diversity is in part the means by which the immune response generates the myriad diversity of different antibody molecules and their associated antigen specificities.
- each heavy and light V region domain may be further divided into three CDRs .
- Three heavy heavy V region domain may be further divided into three CDRs .
- each CDR has four framework regions, three derived from the VH or VL gene segment, the fourth is derived from the JH, JK, or Jl gene segment.
- framework I CDRI , framework II, CDRII, framework III, CDRIII, framework IV.
- all of framework I through Framework III is encoded by the V region gene segment; CDRIII is encoded jointly by both the V region and J region gene segments; framework IV is encoded entirely from the J gene segment.
- antibodies refers to immunoglobulins and immunoglobulin fragments lacking all or part of an immunoglobulin constant region, e . g. , Fv, Fab, Fab' or
- donor antibody refers to a monoclonal or recombinant antibody which contributes the nucleic acid sequences of its variable regions, CDRs or other functional fragments or analogs thereof to an engineered antibody, so as to provide the engineered antibody coding region and resulting expressed engineered antibody with the antigenic specificity and neutralizing activity characteristic of the donor antibody.
- acceptor antibody refers to monoclonal or recombinant antibodies heterologous to the donor antibody, which contributes all, or a portion, of the nucleic acid sequences encoding its heavy and/or light chain framework regions and/or its heavy and/or light chain constant regions or V region subfamily consensus sequences to the engineered antibody.
- a “functional fragment” is a partial heavy or light chain variable sequence (e.g., minor deletions at the amino or carboxy terminus of the immunoglobulin variable region) which retains the same antigen binding specificity and affinity as the antibody from which the fragment was derived.
- an “analog” is an amino acid sequence modified by at least one amino acid, wherein said modification can be chemical or a substitution, which modification permits the amino acid sequence to retain the biological characteristics, e . g. , antigen specificity and high affinity, of the unmodified sequence.
- CDRs from antigen-specific non-human antibodies are grafted onto homologous non-human primate acceptor frameworks .
- the non-human primate acceptor frameworks are from Old World apes.
- the Old World ape acceptor framework is from Pan troglodytes, Pan paniscus or Gorilla gorilla .
- Particularly preferred is the chimpanzee Pan troglodytes .
- Old World monkey acceptor frameworks Most preferably, the Old World monkey acceptor frameworks are from the genus Macaca . Particularly preferred is the cynomolgus monkey Macaca cynomolgus .
- Particularly preferred chimpanzee (Part troglodytes) heavy chain variable region frameworks are CPVH41-12 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 10 and the framework IV amino acid sequence shown in SEQ ID NO: 83; CPVH41-1 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 11 and the framework IV amino acid sequence shown in SEQ ID NO: 85; CPVH41-4 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 12; CPVH41-7 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 13; CPVH41-8 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 14, CPVH41-9 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 15 and the framework IV amino acid sequence shown in SEQ ID NO: 81; CPVH41-10 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 16
- chimpanzee ( Pan troglodytes) light chain kappa variable region frameworks are CPVK46-1 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 28; CPVK46-3 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 29; CPVK46-4 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 30; CPVK46-5 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 31; CPVK46-6 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 32 and the framework IV amino acid sequence shown in SEQ ID NO: 86; CPVK46-7 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 33 and the framework IV amino acid sequence shown in SEQ ID NO: 87; CPVK46-8 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 34; CPVK46-11 having the framework
- Particularly preferred cynomolgus ⁇ Macaca cynomolgus) heavy chain variable region frameworks are CYVH2-1 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 45 and the framework IV amino acid sequence shown in SEQ ID NO: 88; CYVH2-3 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 46 and the framework IV amino acid sequence shown in SEQ ID NO: 89; CYVH2-4 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 47 and the framework IV amino acid sequence shown in SEQ ID NO: 90; CYVH2-5 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 48 and the framework IV amino acid sequence shown in SEQ ID NO: 93; CYVH2-6 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 49 and the framework IV amino acid sequence shown in SEQ ID NO: 91; CYVH2-7 having the framework I, II
- cynomolgus Macaca cynomolgus
- VK variable region frameworks
- CYVK4-2 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 59
- CYVK4-3 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 60 and the framework IV amino acid sequence shown in SEQ ID NO: 94
- CYVK4-5 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 61
- CYVK4-6 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 62 and the framework IV amino acid sequence shown in SEQ ID NO: 95
- CYVK4-10 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 63
- CYVK4-11 having the framework I, II and III amino acid sequence shown in SEQ ID NO: 64 and the framework IV amino acid sequence shown in SEQ ID NO: 96.
- Isolated nucleic acid molecules encoding the chimpanzee VH and VK acceptor framework I, II and III amino acid sequences of SEQ ID NOs: 10, 11, 12, 13, 14, 15, 16, 17, 18, 28, 29, 30, 31, 32, 33, 34, 35 or 36 and the framework IV amino acid sequences of SEQ ID NOs: 81, 82, 83, 84 ,85, 86 or 87 are also part of the present invention.
- nucleic acid molecules encoding the cynomolgus VH and VK acceptor framework I, II and III amino acid sequences of SEQ ID NOs: 45, 46, 47, 48, 49, 50, 51, 52, 59, 60, 61, 62, 63 or 64 and the framework IV amino acid sequences of SEQ ID NOs: 88, 89, 90, 91, 92, 93, 94, 95 or 96 are also part of the present invention.
- Nucleic acid sequences encoding functional fragments or analogs of the VH and VK acceptor framework amino acid sequences are also part of the present invention.
- nucleic acid sequences complementary to these framework regions are also encompassed by the present invention.
- Useful DNA sequences include those sequences which hybridize under stringent hybridization conditions to the DNA sequences. See, T. Maniatis et al . , Molecular Cloning: A Laboratory Manual , Cold Spring Harbor Laboratory (1982), pp. 387-389.
- An example of one such stringent hybridization condition is hybridization at 4XSSC at 65°C, followed by a washing in 0.1XSSC at 65°C for one hour.
- an exemplary stringent hybridization condition is 50% forma ide, 4XSSC at
- these hybridizing DNA sequences are at least about 18 nucleotides in length.
- Suitable frameworks are selected by computer homology searching among members of a database of Old World ape or monkey VH and VL regions .
- the framework portions of primate antibodies are useful as components of therapeutic antibodies.
- primate antibody frameworks will be tolerated when used in the treatment of humans due to the close sequence homology between the genes of the primates and humans.
- the present invention provides for the grafting of CDRs from an antigen specific non-human donor antibody to acceptor V regions derived from non-human primate species .
- the antigen specificity and binding kinetics of the donor antibody which may be of rodent or any other non-human origin, are best preserved by selecting primate acceptor V regions that are determined by computer homology searching to be most similar to the donor antibody.
- the acceptor antibody may be a consensus sequence generated from primate V region subfamilies, or portions thereof, displaying the highest homology to the donor antibody.
- the resulting engineered constructs in which the donor CDRs are grafted onto primate acceptor frameworks, are subsequently refined by analysis of three-dimensional models based on known antibody crystal structures as found, e . g. , in the Protein Data Bank, http://www.pdb.bnl.gov/pdb- bin/pdbmain.
- computer generated three- dimensional models of the donor antibody may be computed by means of commercially available software such as "AbM" (Oxford Molecular, Oxford, UR) .
- CDR-contacting residues are CDR-contacting residues and that are seen to be important in the presentation of CDR loops, and therefore binding avidity.
- a CDR-contacting residue is one which is seen in three-dimensional models to come within the van der Waals radius of a CDR residue, or could interact with a CDR residue via a salt bridge or by hydrophobic interaction.
- Such donor framework (CDR-contacting) residues may be retained in the engineered construct.
- the modeling experiments can also reveal which framework residues are largely exposed to the solvent environment.
- the engineered constructs may be further improved by substituting some or all of these solvent-accessible amino acid residues with those found at the same position among human V regions most homologous to the engineered construct as disclosed in U.S. Patent No. 5,639,641.
- the engineered V regions are then joined to one or more different human or Old World ape constant regions depending on the desired secondary immune functions such as complement fixation or Fc receptor binding.
- Human constant regions can be selected from human immunoglobulin classes and isotypes, such as IgG (subtypes 1 through 4) , IgM, IgA, and IgE.
- IgG4 subtype variant containing the mutations S228P and L235E (PE mutation) in the heavy chain constant region which results in reduced effector function can also be selected. See U.S. Patent Nos. 5,624,821 and 5,648,260.
- the complete heavy and light chain genes are transferred to suitable expression vectors and co-expressed in the appropriate host cells such as Chinese hamster ovary, COS or myeloma cells.
- suitable expression vectors such as Chinese hamster ovary, COS or myeloma cells.
- the resulting engineered antibody is expected to be of substantially reduced immunogenicity when administered to humans, and to retain full binding affinity for antigen.
- Acceptor V regions can be isolated specifically for each donor V region by directed PCR methodology where a non-human primate cDNA library is surveyed for acceptor frameworks most similar to the donor antibody. Oligonucleotide PCR primers homologous to the donor antibody framework I (paired with C- region 3' PCR primers) are used to direct PCR amplification of a non-human primate, e . g. , chimpanzee lymphocyte cDNA library. This would select for V-regions with framework I regions similar to the donor antibody, and sequence analysis of the obtained clones would reveal the associated framework
- PCR primers would then be designed based on the knowledge of the non-human primate framework III sequences thus obtained, and used to direct PCR amplification of the original cDNA library together with a vector-specific 5' PCR primer.
- cDNA clones obtained from the second round of PCR amplification would have framework I and
- Chimpanzee heavy chain V regions were cloned from the total RNA using Marathon RACE methodology (Clontech, Palo Alto, CA, USA) following exactly the manufacturer's protocol using 3' Cgl gene specific primers.
- CPVH41-1, CPVH41-4, CPVH41-7, CPVH41-8, CPVH41-9, CPVH41-10, CPVH41-18 and CPVH41-19 are shown in SEQ ID NOs: 10, 11, 12, 13, 14 ,15, 16, 17 and 18, respectively.
- the ammo acid sequence of the region encoding framework IV of these clones for CPVH41-9, CPVH41-10, CPVH41-12 , CPVH41-19 and CPVH 41-1 are shown in SEQ ID NOs: 81, 82, 83, 84 and 85, respectively.
- amino acid sequences of the region from the first amino acid of the mature VK region to the second conserved cysteine residue at position 88, adjacent to CDR III of these clones namely CPVK46-1, CPVK46- 3, CPVK46-4, CPVK46-5, CPVK46-6, CPVK46-7, CPVK46-8, CPVK46-11 and CPVK46-14 are shown in SEQ ID NOs: 28, 29, 30, 31, 32, 33, 34, 35 and 36, respectively.
- amino acid sequences of the region encoding framework IV of these clones for CPVK46-6 and CPVK46-7 are shown in SEQ ID NOs: 86 and 87, respectively.
- the chimpanzee VK amino acid sequences comprising the mature N-terminus and the second conserved cysteine residue at position 88 were used as query sequences in computer homology searching of the Rabat database. The results of this analysis are shown in Table 2. In each case the closest match was with a human VK region, displaying between 68% (46-4/HRL310) and 97% (46-11/HRL106) sequence identity at the amino acid level. It is evident that the chimpanzee VK sequences are distinct from the collection of human VK found in the Rabat database.
- the human subgroup homology is presented in Table 2. Of the four major human VK subgroups, matches were found for the two most frequently isolated, indicating that the chimpanzee VK repertoire is at least homologous to members of the majority of the human VK repertoire. Further sampling of the chimpanzee VK cDNA library will likely identify a greater diversity of chimpanzee VK regions, including ones homologous to the remaining two human VK subgroups (VKII and VKIV) .
- RNA was recovered from a single donor cynomolgus monkey (Macaca cynomolgus) by means of standard laboratory practice. Cynomolgus heavy chain V regions were cloned from the total RNA using Marathon RACE methodology (Clontech, Palo Alto, CA, USA) following exactly the manufacturer's protocol using 3' Cgl gene specific primers. After RACE PCR amplification, DNA bands of the expected size were excised from agarose gels, the DNA was purified and cloned into a plasmid vector. Although this cDNA library contains many distinct heavy V region clones, eight were selected randomly for sequence analysis.
- CyVH2-8 and CyVH2-10 are shown in SEQ ID NOs: 45, 46, 47, 48,
- amino acid sequences of the region from the first amino acid of the mature VK region to the second conserved cysteine residue at position 88, adjacent to CDRIII, of these clones namely CyV ⁇ 4-2, CyVK4-3, CyV ⁇ 4-5, CyVK4-6, CyV ⁇ 4-10 and CyV ⁇ 4- 11 are shown in SEQ ID NOs: 59, 60, 61, 62, 63 and 64, respectively.
- CyV ⁇ 4-ll are shown in SEQ ID NOs: 94, 95 and 96, respectively.
- the cynomolgus VK amino acid sequences comprising the mature N-terminus and the second conserved cysteine residue at position 88 were used as query sequences in computer homology searching of the Rabat database. The results of this analysis are shown in Table 4. In each case the closest match was with a human VK region, displaying between 73% (4- 11/ HRL10S) and 94% (4-3/ HRL400) sequence identity at the amino acid level. It is evident that the cynomolgus VK sequences are distinct from the collection of human VK found in the public genetic databases.
- the human subgroup homology is presented in Table 4. Matches were found for three of the four major human Vk subgroups, indicating that the cynomolgus
- VK repertoire is largely homologous to members of the majority of the human VK repertoire. Further sampling of the cynomolgus VK cDNA library will likely identify a greater diversity of cynomolgus VK regions, including ones homologous to the remaining human VK subgroup (VKIII) .
- VK and VH genes of the rat anti-interleukin-5 (IL-5) antibody 4A6 are shown in SEQ ID NOs: 65 and 66, respectively. These genes encode a high affinity neutralizing monoclonal antibody specific for human IL-5 useful for the treatment of asthma. See U.S. Patent No.
- the 4A6 light chain was engineered as follows.
- the sequence of donor antibody VK4A6 (SEQ ID NO: 65) was aligned with the acceptor antibody light chain VK region from the chimpanzee Mab CIO8G (Mol . Immunol . 32:1081-1092 (1995)) (SEQ ID NO: 65) was aligned with the acceptor antibody light chain VK region from the chimpanzee Mab CIO8G (Mol . Immunol . 32:1081-1092 (1995)) (SEQ ID NO: 65) was aligned with the acceptor antibody light chain VK region from the chimpanzee Mab CIO8G (Mol . Immunol . 32:1081-1092 (1995)) (SEQ ID NO: 65) was aligned with the acceptor antibody light chain VK region from the chimpanzee Mab CIO8G (Mol . Immunol . 32:1081-1092 (1995)) (SEQ ID NO:
- the sequence of donor antibody VH4A6 (SEQ ID NO: 66) was aligned with the acceptor antibody heavy chain V region from the chimpanzee Mab C108G (SEQ ID NO: 69) as shown in Fig. 2.
- a large gap was introduced in the VH4A6 CDRIII alignment, as CDRIII of VHC108G is 10 residues longer.
- CDR residues were identified as defined by the convention of Rabat et al . , supra .
- Framework residues that could influence CDR presentation were identified by analysis of three-dimensional models based on known antibody crystal structures.
- the residues of this CDR-contacting set were compared among the aligned VH4A6 and VHC108G sequences, and the positions of the set that differed between the VH4A6 and the VHC108G were marked (Fig. 2, asterisks) .
- 11 such CDR contacting residues that differed between VH4A6 and the VHC108G were selected and marked.
- the CDRs and the marked CDR contacting framework residues of VH4A6 (the donor antibody) were transferred replacing the corresponding residues of VHC108G (the acceptor antibody) .
- the completed engineered 4A6 heavy chain V region is shown in SEQ ID NO: 70. Eleven donor framework residues were retained in the engineered molecule at residues 27, 30, 38, 49, 66, 67, 69, 71, 73, 78 and 94.
- the engineered 4A6 can be expressed in cells using methods well known to those skilled in the art. Briefly, genes encoding the complete engineered 4A6 VH and VK regions can be assembled from long synthetic oligonucleotides and ligated into appropriate eukaryotic expression vectors containing the desired antibody constant regions. Such an expression vector will contain selectable markers, for
- neomycin resistance and regulatory sequences for example, the CMV promoter, required to direct the expression of full-length antibody heavy and light chains.
- transfection of the appropriate "host cell, for example, Chinese hamster ovary would result in the expression of fully active engineered 4A6.
- VK and VH genes of the murine anti-integrin antibody B9 are shown in SEQ ID NOs: 71 and 72, respectively. These genes encode a high affinity neutralizing monoclonal antibody specific for human integrin ⁇ v ⁇ 3 useful for the treatment of vascular diseases.
- the B9 light chain was engineered as follows. The amino acid sequence of donor antibody VKB9 (SEQ ID NO: 72) was compared to each of the nine chimpanzee VK sequences described above and percent sequence identity determined by computer homology searching using the LASERGENE program "MEGALIGN" (DNASTAR, Inc., Madison, WI) . Clones CPVK46-3
- the B9 heavy chain was engineered in analogous fashion.
- the amino acid sequence of donor antibody VHB9 (SEQ ID NO: 71) was compared to each of the nine chimpanzee VH sequences described above by computer homology searching.
- CPVH41-18 (SEQ ID NO: 17) was identified as the chimpanzee VH region with the highest overall sequence similarity (58%) to the B9 donor VH.
- the chimpanzee JH gene segment of CPVH41-10 (SEQ ID NO: 82) was selected as acceptor framework IV.
- the sequences of the donor VHB9 and chimpanzee acceptor V regions were aligned and the positions of their respective framework and CDRs determined as shown in Fig. 4.
- VHB9 and CPVH41-18 share 58% overall sequence identity, with the framework regions I through III sharing 65% sequence identity.
- Framework residues that could influence CDR presentation were identified by analysis of three-dimensional models based on known antibody crystal structures. The residues of this CDR-contacting set were compared among the aligned VHB9 and CPVH41-18 sequences, and the nine residues of the set that differed between VHB9 and the chimpanzee acceptor frameworks were marked. The CDRs and the marked framework residues of donor antibody VHB9 were transferred replacing the corresponding residues of CPVH41-18 (the acceptor antibody) . Lastly, the framework IV sequences of CPVH41-10 replaced the corresponding framework IV residues of the B9 heavy chain variable region. The completed engineered B9 heavy chain V
- the engineered B9 antibody was expressed in cells using methods well known to those skilled in the art. Briefly, genes encoding the complete engineered B9 VH and VK regions were assembled from long synthetic oligonucleotides and ligated into appropriate eukaryotic expression vectors containing IgGl, ⁇ antibody constant regions. The expression vector contained a selectable marker for neomycin resistance and CMV promoter regulatory sequences. Subsequent transfection of a COS host cell resulted in the expression of engineered B9 (CPB9) .
- CPB9 engineered B9
- CPB9 The relative binding avidity of CPB9 was compared to that of the original murine B9 antibody as follows .
- CPB9 antibodies present in culture supernatants from cells maintained in culture for 5 days after transfection with the expression constructs were compared to the parental murine B9 antibody using the ORIGEN technology (IGEN Inc, Gaithersburg, MD) . Briefly, different dilutions of the B9 variants were incubated with purified human 0tv ⁇ 3 integrin which had previously been biotinylated, and an electrochemiluminescent TAG moiety specific for the antibody C regions. B9 variant antibody bound to the integrin was measured by capturing the immune complexes onto streptavidin beads followed by analysis on the ORIGEN instrument.
- VH and VK genes of the murine anti-erythropoietin receptor antibody 3G9 are shown in SEQ ID NOs: 75 and 76, respectively. These genes encode a high affinity neutralizing monoclonal antibody specific for human erythropoietin receptor (EPOr) useful for the treatment of hematopoietic disorders.
- the 3G9 light chain was engineered as follows. The amino acid sequence of donor antibody VK3G9 (SEQ ID NO: 76) was compared to each of the nine chimpanzee VK sequences described above by computer homology searching as described above.
- Clones CPVK46-3 (SEQ ID NO: 29), CPVK46-5 (SEQ ID NO: 31), CPVK46-8 (SEQ ID NO: 34) and CPVK46-14 (SEQ ID NO: 36) were identified as the chimpanzee VK regions with the highest overall sequence similarity (65%) to the 3G9 donor VK. CPVK46-14 was selected as the acceptor framework.
- the chimpanzee JK gene segment of CPVK46-14 was identical to that of CPVK46-1 (SEQ ID NO: 97) and was selected as acceptor framework IV.
- the sequences of the donor V ⁇ 3G9 and acceptor CPVK46-14 V regions were aligned and the positions of their respective framework and CDRs were determined as shown in Fig. 5.
- the CDR residues were identified as defined by the convention of Rabat et al . , supra .
- the results show that V ⁇ 3G9 and CPVK46-14 share 65% overall sequence identity, with the framework regions I through III sharing 73% sequence identity.
- Framework residues that could influence CDR presentation were identified by analysis of three-dimensional models based on known antibody crystal structures. The residues of this
- the 3G9 heavy chain was engineered in analogous fashion.
- the amino acid sequence of donor antibody VH3G9 (SEQ ID NO: 75) was compared to each of the 9 chimpanzee VH sequences described above by computer homology searching.
- Clone CPVH41-18 (SEQ ID NO: 17) was identified as the chimpanzee VH region with the highest overall sequence similarity (53%) to the 3G9 donor VH.
- the chimpanzee JH gene segment of CPVH41-18 was identical to CPVH41-9 (SEQ ID NO: 81) and was selected as acceptor framework IV.
- the sequences of the donor VH3G9 and chimpanzee acceptor V regions were aligned and the positions of their respective framework and CDRs determined as shown in
- CPVH41-18 sequences and the twelve residues of the set that differed between VH3G9 and the chimpanzee acceptor frameworks were marked.
- the CDRs and the marked framework residues of donor antibody VH3G9 were transferred replacing the corresponding residues of CPVH41-18 (the acceptor antibody) .
- the framework IV sequences of CPVH41-18 replaced the corresponding framework IV residues of the 3G9 heavy chain variable region.
- the completed engineered 3G9 heavy chain V region is shown in SEQ ID NO: 78. Twelve donor framework residues were retained in the engineered heavy chain variable
- the engineered 3G9 antibody was expressed in cells using methods well known to those skilled in the art. Briefly, genes encoding the complete engineered 3G9 VH and VK regions were assembled from long synthetic oligonucleotides and ligated into appropriate eukaryotic expression vectors containing IgGl, ⁇ antibody constant regions. The expression vector contained a selectable marker for neomycin resistance and CMV promoter regulatory sequences . Subsequent transfection of COS host cells resulted in the expression of engineered 3G9 (CP3G9).
- CP3G9 engineered 3G9
- HZ3G9 is a humanized variant of 3G9 in which human frameworks were used in traditional CDR grafting experiments.
- the humanized 3G9 heavy chain amino acid sequence is shown in SEQ ID NO: 79.
- the humanized 3G9 light chain sequence is shown in SEQ ID NO: 80.
- HZ3G9 retained the full binding affinity and avidity of the parental murine 3G9. Accordingly, since HZ3G9G1 is identical to the chimpanzee version in all respects except the V region cassette, it was used in the present comparative binding experiments as a surrogate for murine 3G9. Negative control antibodies were also tested, including HZD12 which is a humanized antibody specific for human integrin, and CPB9 which is a chimpanzee framework engineered antibody specific for human integrins described above. Different concentrations of the 3G9 variants and control antibodies were incubated for one hour. After washing, the bound
- CP3G9 was captured onto a sensor surface of immobilized protein A.
- the kinetic binding constants were determined by passing solutions of monomeric EPOr over the surface and monitoring binding versus time. The equilibrium dissociation constant for the interaction was then derived from the ratio of the kinetic constants.
- the parent murine 3G9 was captured onto a surface of protein A captured rabbit anti-mouse Fc specific polyclonal antibody. The kinetics and dissociation constant for the interaction with EPOr was determined as described above. All measurements were made in 10 mM sodium phosphate, 150 mM NaCl pH 7.2 3 mM EDTA and 0.005% Tween 20. The flow rate was 60 uL/min. The temperature was 20° C.
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Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP99918862A EP1073464B1 (en) | 1998-04-28 | 1999-04-28 | Monoclonal antibodies with reduced immunogenicity |
JP2000545566A JP2002512776A (en) | 1998-04-28 | 1999-04-28 | Monoclonal antibodies with reduced immunogenicity |
DE69920897T DE69920897T2 (en) | 1998-04-28 | 1999-04-28 | MONOCLONAL ANTIBODIES WITH REDUCED IMMUNIZATION ABILITY |
CA002327505A CA2327505A1 (en) | 1998-04-28 | 1999-04-28 | Monoclonal antibodies with reduced immunogenicity |
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US8336798P | 1998-04-28 | 1998-04-28 | |
US60/083,367 | 1998-04-28 |
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US (2) | US6936698B2 (en) |
EP (1) | EP1073464B1 (en) |
JP (1) | JP2002512776A (en) |
CA (1) | CA2327505A1 (en) |
DE (1) | DE69920897T2 (en) |
ES (1) | ES2230848T3 (en) |
WO (1) | WO1999055369A1 (en) |
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CA2327505A1 (en) | 1999-11-04 |
US20050208625A1 (en) | 2005-09-22 |
EP1073464A1 (en) | 2001-02-07 |
US20020062009A1 (en) | 2002-05-23 |
JP2002512776A (en) | 2002-05-08 |
EP1073464A4 (en) | 2002-07-03 |
ES2230848T3 (en) | 2005-05-01 |
DE69920897T2 (en) | 2005-10-13 |
EP1073464B1 (en) | 2004-10-06 |
DE69920897D1 (en) | 2004-11-11 |
US6936698B2 (en) | 2005-08-30 |
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