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. 1973 Aug;133(4):827–836. doi: 10.1042/bj1330827

The binding of haptens by the polypeptide chains of rabbit antibody molecules

G T Stevenson 1
PMCID: PMC1177773  PMID: 4800429

Abstract

1. The binding of haptens by the polypeptide chains derived from two rabbit immunoglobulin G antibodies was examined by gel chromatography and equilibrium dialysis. 2. The γ chains were examined in a dilute sodium acetate buffer, pH5.4, in which they exist as a monodisperse solution of dimers; aggregation of the protein promoted by some haptens had to be avoided. These chains exhibited variable extents of binding, reflecting the specificities of the parent antibody molecules, usually with only small increments above the binding by γ chains from normal immunoglobulin G. 3. The light chains existed as an interconverting mixture of monomers and dimers in all buffers of near neutral pH that were examined. They bound small amounts of hapten, again broadly reflecting the specificities of the parent antibody molecules. 4. For both the γ and light chains the dimeric state appeared necessary for appreciable binding of hapten. Apparently in each case the partners in the dimer interact in a manner analogous to the γ chain–light chain interaction in the parent antibody molecule, to give a site analogous to the antibody site. This implies that the binding of antigens by isolated chains has a large fortuitous element, providing no reliable indication of their contributions to the original antibody sites.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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