Humanized antibodies and methods for making them
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1. A method for making a humanized antibody comprising non-human, import Complementarity Determining Region (CDR) amino acid residues and human Framework Region (FR) amino acid residues, comprising the steps of:
- (a) obtaining the amino acid sequences of an import variable domain and of a VH subgroup III consensus human variable domain;
(b) identifying CDR amino acid sequences in the import and the human variable domain sequences;
(c) substituting import CDRs for the corresponding human CDRs;
(d) aligning the amino acid sequences of a FR of the import antibody and the corresponding FR of the consensus variable domain;
(e) identifying import antibody FR residues in the aligned FR sequences that are non-homologous to the corresponding consensus variable domain residues;
(f) determining if the non-homologous import amino acid residue is expected to have at least one of the following effects;
(1) non-covalently binds antigen directly;
(2) interacts with a CDR;
or(3) participates in the VL -VH interface;
(g) for any non-homologous import antibody amino acid residue which is expected to have at least one of these effects, substituting that residue for the corresponding amino acid residue in the consensus variable domain FR sequence; and
(h) preparing a humanized antibody which binds antigen, wherein the humanized antibody comprises an amino acid sequence determined according to the above steps.
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Abstract
Variant immunoglobulins, particularly humanized antibody polypeptides are provided, along with methods for their preparation and use. Consensus immunoglobulin sequences and structural models are also provided.
1162 Citations
30 Claims
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1. A method for making a humanized antibody comprising non-human, import Complementarity Determining Region (CDR) amino acid residues and human Framework Region (FR) amino acid residues, comprising the steps of:
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(a) obtaining the amino acid sequences of an import variable domain and of a VH subgroup III consensus human variable domain; (b) identifying CDR amino acid sequences in the import and the human variable domain sequences; (c) substituting import CDRs for the corresponding human CDRs; (d) aligning the amino acid sequences of a FR of the import antibody and the corresponding FR of the consensus variable domain; (e) identifying import antibody FR residues in the aligned FR sequences that are non-homologous to the corresponding consensus variable domain residues; (f) determining if the non-homologous import amino acid residue is expected to have at least one of the following effects; (1) non-covalently binds antigen directly; (2) interacts with a CDR;
or(3) participates in the VL -VH interface; (g) for any non-homologous import antibody amino acid residue which is expected to have at least one of these effects, substituting that residue for the corresponding amino acid residue in the consensus variable domain FR sequence; and (h) preparing a humanized antibody which binds antigen, wherein the humanized antibody comprises an amino acid sequence determined according to the above steps. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for making a humanized antibody comprising non-human Complementarity Determining Region (CDR) amino acid residues and human Framework Region (FR) amino acid residues, comprising providing an import, non-human antibody variable domain amino acid sequence having CDR amino acid residues and FR amino acid residues;
- obtaining the amino acid sequence of a VH subgroup III consensus human antibody variable domain having CDR amino acid residues and FR amino acid residues;
substituting non-human CDR amino acid residues for human CDR amino acid residues in the consensus human antibody variable domain;
substituting an amino acid residue for the consensus amino acid residue at at least one of the following sites;4L, 35L, 36L, 38L, 43L, 44L, 46L, 58L, 62L, 63L, 64L, 65L, 66L, 67L, 68L, 69L, 70L, 71L, 73L, 85L, 87L, 98L, 2H, 4H, 24H, 36H, 37H, 39H, 43H, 45H, 49H, 58H, 60H, 67H, 68H, 69H, 70H, 73H, 74H, 75H, 76H, 78H, 91H, 92H, 93H. and 103H; and
preparing a humanized antibody which binds an antigen, wherein the humanized antibody comprises an amino acid sequence determined according to the above steps. - View Dependent Claims (8)
- obtaining the amino acid sequence of a VH subgroup III consensus human antibody variable domain having CDR amino acid residues and FR amino acid residues;
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9. A humanized antibody variable domain having a functional antigen binding region, said humanized antibody variable domain comprising non-human Complementarity Determining Region (CDR) amino acid residues incorporated into a VH subgroup III consensus human antibody variable domain, and further comprising an amino acid substitution at a site selected from the group consisting of:
4L, 35L, 36L, 38L, 43L, 44L, 46L, 58L, 62L, 64L, 65L, 66L, 67L, 68L, 69L, 70L, 71L, 73L, 85L, 87L, 98L, 2H, 4H, 24H, 36H, 37H, 39H, 43H, 45H, 49H, 58H, 60H, 68H, 69H, 70H, 73H, 74H, 75H, 76H, 78H, 92H, and 93H. - View Dependent Claims (10, 11)
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12. A method for making a humanized antibody comprising introducing Complementarity Determining Region (CDR) amino acid residues from an import antibody variable domain into a VH subgroup III consensus human antibody variable domain.
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13. A humanized antibody variable domain having a functional antigen binding region, said humanized antibody variable domain comprising non-human Complementarity Determining Region (CDR) amino acid residues incorporated into a VH subgroup III consensus human antibody variable domain and further comprising a non-human import Framework Region (FR) residue, wherein the non-human import FR residue introduces a glycosylation site which affects the antigen binding or affinity of the humanized antibody variable domain.
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14. A humanized antibody which binds the HER2 receptor with an affinity of about 4.7 nM Kd or better affinity and comprises a heavy chain variable domain which comprises non-human import antibody Complementarity Determining Region (CDR) amino acid residues incorporated into a VH subgroup III consensus human variable domain.
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15. A humanized variant of a non-human parent antibody, wherein the humanized variant comprises non-human Complementarity Determining Region (CDR) amino acid residues and human Framework Region (FR) amino acid residues, and:
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(a) binds the HER2 receptor with an affinity of about 4.7 nM Kd or better affinity; (b) mediates specific cell lysis of SK-BR-3 calls in the presence of IL-2 activated human peripheral blood lymphocytes at least about four fold more effectively than the non-human parent antibody; and (c) mediates Antibody Dependent Cellular Cytotoxicity (ADCC) selective for cell types which overexpress p185HER2 at least about two fold more effectively than for cell types which express low levels of p185HER2. - View Dependent Claims (16, 17, 18, 19)
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20. A humanized variant of a non-human parent antibody, wherein the humanized variant comprises non-human Complementarity Determining Region (CDR) amino acid residues and human Framework Region (FR) amino acid residues, and;
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(a) binds the HER2 receptor with an affinity of about 4.7 nM Kd or better affinity; and (b) comprises a Framework Region (FR) amino acid substitution at a site selected from the group consisting of 73H, 78H, 93H and 66L, utilizing the numbering system set forth in Kabat. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28. A humanized variant of a non-human parent antibody, wherein the humanized variant comprises non-human Complementarity Determining Region (CDR) amino acid residues and human Framework Region (FR) amino acid residues;
- binds the HER2 receptor with better affinity than the non-human parent antibody; and
comprises Framework Region (FR) amino acid substitutions at sites 71H, 73H, 78H, 93H and 66L, utilizing the numbering system set forth in Kabat.
- binds the HER2 receptor with better affinity than the non-human parent antibody; and
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29. An antibody which binds an antigen and comprises non-human heavy chain variable domain Complementarity Determining Region (CDR) amino acid residues which bind said antigen and VH subgroup III consensus human variable domain Framework Region (FR) amino acid residues;
- and further comprises non-human light chain variable domain CDR amino acid residues which bind said antigen.
- View Dependent Claims (30)
Specification