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The first complete amino-acid sequence of the variable region of the gamma 3 heavy chain from a murine anti-streptococcal group A polysaccharide (A-CHO) immunoglobulin (monoclonal antibody 2S1.3) is described. Therefore, in conjunction with the previously published 2S1.3 light chain sequence, a V kappa 25 structure, the entire variable domain of this antibody has been determined. In addition, four partial amino-terminal heavy chain sequences of other antibodies with the same specificity are reported. These heavy chains share a high degree of homology with heavy chains from fructosan-binding murine myeloma proteins with the exception of those positions known to be encoded by the D (diversity) segment in germ line DNA. The light chains associated with the heavy chains reported here are products of the V kappa 25, V kappa 27, and J kappa 5 genes. Up to date three VH and four V kappa subgroups have been shown to contribute genetic material to the assembly of antibodies specific for the A-CHO. Unlike other experimental systems employing structurally completely resolved full antigens the antistreptococcal immune response uses V genes previously shown to be involved in the formation of antibodies with different specificities. This provides further experimental evidence for the physiological relevance of heavy/light chain association as a posttranscriptional diversification mechanism in the generation of the antibody repertoire in addition to those somatic diversifiers acting directly upon the genes encoding the variable regions of individual chains.

biological chemistry hoppe-seyler

Combinatorial Diversity in the Generation of Antibody Molecules. The Complete Amino- Acid Sequence of the Variable Domain of a Monoclonal Anfi-streptococcal Group A Polysaccharide Antibody