title: Idiotypic selection of an antibody mutant with changed hapten binding specificity, resulting from a point mutation in position 50 of the heavy chain.
abstract: Somatic mutation occurs at a low rate in the rearranged antibody V region genes of the hybridoma line B1-8. delta 1 which expresses an antibody with specificity for the hapten 4-hydroxy-3-nitro-5-iodo-phenylacetyl (NIP). A mutant was selected which had lost a binding site-related idiotope but retained most of its other idiotypic determinants. The mutant had concomitantly lost NIP binding and acquired specificity for dinitrophenylated bovine serum albumin. It carried a single point mutation in position 50 of the heavy chain, resulting in the replacement of an arginine by a glycine.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal; D001483:Base Sequence; D002460:Cell Line; D004262:DNA Restriction Enzymes; D005455:Fluorescent Antibody Technique; D006241:Haptens; D006825:Hybridomas / Q000276:immunology; D007143:Immunoglobulin Heavy Chains / Q000235:genetics*; D007130:Immunoglobulin Idiotypes / Q000235:genetics* / Q000276:immunology; D007135:Immunoglobulin Variable Region / Q000235:genetics; D051379:Mice; D009154:Mutation; D010954:Plasmacytoma
chemical_list: D000911:Antibodies, Monoclonal; D006241:Haptens; D007143:Immunoglobulin Heavy Chains; D007130:Immunoglobulin Idiotypes; D007135:Immunoglobulin Variable Region; D004262:DNA Restriction Enzymes