DNA encoding antibodies with altered effector functions
DCFirst Claim
1. Isolated DNA encoding at least part of a constant region of an immunoglobulin heavy chain in which at least one amino acid selected from the group consisting of amino acid residues 234, 235, 236, 237, 297, 318, 320 and 322 is substituted with an amino acid which is different from that present in an unmodified antibody thereby causing an alteration in an effector function while retaining binding to antigen as compared with the unmodified antibody.
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Abstract
The DNA encoding an antibody with an altered function, e.g. altered affinity for an effector ligand such as Fc receptor (FcR) on a cell or the Cl component of complement is produced by replacing the nucleic acid encoding at least one amino acid residue in the constant portion of the antibody with nucleic acid encoding a different residue.
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30 Claims
- 1. Isolated DNA encoding at least part of a constant region of an immunoglobulin heavy chain in which at least one amino acid selected from the group consisting of amino acid residues 234, 235, 236, 237, 297, 318, 320 and 322 is substituted with an amino acid which is different from that present in an unmodified antibody thereby causing an alteration in an effector function while retaining binding to antigen as compared with the unmodified antibody.
- 11. A replicable expression vector comprising a suitable promoter operably linked to a DNA which encodes at least part of a constant region of an immunoglobulin heavy chain in which at least one amino acid selected from the group consisting of amino acid residues 234, 235, 236, 237, 297, 318, 320 and 322 is substituted with an amino acid which is different from that present in an unmodified antibody thereby causing an alteration in an effector function while retaining binding to antigen as compared with the unmodified antibody.
Specification