title: Completion of the analysis of the primary structure of the variable domain of a homogeneous rabbit antibody to type III pneumococcal polysaccharide.
abstract: The amino acid sequence between residues 70 and 116 of the V (variable) region of the H (heavy) chain derived from rabbit antibody BS-5, specific for type III pneumococcal polysaccharide, was determined. The sequence of this section of the H chain which includes the hypervariable residues 94 to about 112 was unique, although minor variant sequences present in the H chain preparation would not have been detected by the techniques used in this work. Taken together with the known sequences of the N-terminal 69 residues of H chain BS-5 (Jaton & Braun, 1972) and of the V region of the light chain (Jaton, 1974b), the data establish the complete sequence of the V domain of a rabbit immunoglobulin G. The V region of H chain BS-5 is compared with the basic sequences of the three human V region subgroups known to date, with one mouse H chain, and with guinea-pig pooled H chains. Even though chains from guinea pig and mouse clearly belong to the subgroup III of variability (V(HIII)), rabbit H chain BS-5 (allotypic variant a(1)) appears more closely related to the subgroup V(HII) than to the subgroups V(HIII) or V(HI). The homology between V(L) and V(H) regions of antibody BS-5 (28%) is not greater than that observed between the V(H) region of antibody BS-5 and the V(L) regions of different rabbit antibodies.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis*; D003488:Cyanogen Bromide; D000939:Epitopes; D007128:Immunoglobulin Fragments / Q000032:analysis; D010446:Peptide Fragments / Q000032:analysis; D011135:Polysaccharides, Bacterial; D011817:Rabbits / Q000276:immunology; D013296:Streptococcus pneumoniae / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000939:Epitopes; D007128:Immunoglobulin Fragments; D010446:Peptide Fragments; D011135:Polysaccharides, Bacterial; D003488:Cyanogen Bromide