title: Specificity change of antibody to (4-hydroxy-3-nitrophenyl)acetyl haptens by somatic hypermutation.
abstract: Change in the specificity of anti-(4-hydroxy-3-nitrophenyl)acetyl (NP) antibodies (Abs) with time after immunization was studied. The early anti-NP Abs was specific to the ionized (phenolate) form of NP. The specificity changed with time and the late Abs became able to bind to the protonated (phenolic) form as well as the phenolate form of NP. The nucleotide sequences of mRNA coding for variable regions of heavy and light chains suggested that somatic hypermutation contributed to this change of the specificity.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis / Q000235:genetics* / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000235:genetics / Q000276:immunology; D000915:Antibody Affinity; D000918:Antibody Specificity; D001483:Base Sequence; D005260:Female; D006241:Haptens / Q000276:immunology; D006863:Hydrogen-Ion Concentration; D007114:Immunization; D007143:Immunoglobulin Heavy Chains / Q000235:genetics; D007147:Immunoglobulin Light Chains / Q000235:genetics; D007700:Kinetics; D051379:Mice; D008810:Mice, Inbred C57BL; D008969:Molecular Sequence Data; D009154:Mutation; D009596:Nitrophenols / Q000276:immunology*; D010648:Phenylacetates; D012333:RNA, Messenger / Q000235:genetics
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D006241:Haptens; D007143:Immunoglobulin Heavy Chains; D007147:Immunoglobulin Light Chains; D009596:Nitrophenols; D010648:Phenylacetates; D012333:RNA, Messenger; C026242:4-hydroxy-5-nitrophenyl acetic acid