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. 1964 May 1;119(5):817–836. doi: 10.1084/jem.119.5.817

PROTEIN-PROTEIN INTERACTIONS AMONG L POLYPEPTIDE CHAINS OF BENCE-JONES PROTEINS AND HUMAN γ-GLOBULINS

J A Gally 1, G M Edelman 1
PMCID: PMC2137741  PMID: 14157032

Abstract

The L polypeptide chains of certain Bence-Jones proteins of group I have been found in three forms: monomers of molecular weight of about 20,000, dimers which monomerize in dissociating solvents, and dimers which are stable in such solvents. The L polypeptide chains of some Bence-Jones proteins of group II were found to occur naturally only as stable dimers. The L chains of normal human γ-globulin have been obtained in a reduced unalkylated form, and a fraction of these chains was found to form stable dimers under oxidizing conditions. It is suggested that a single disulfide bond is involved in stabilization of the dimer. In experiments on the reconstitution of 7S γ-globulin, it was found that stable dimers of L polypeptide chains did not associate appreciably with Hγ chains to form a soluble product. L chains in the monomeric form, both of a reduced alkylated Bence-Jones protein and of reduced unalkylated γ-globulin, combined with Hγ chains to form a 7S product. After hydrolysis with papain, the 7S material containing the Bence-Jones L chains yielded fragments comparable to the fragments of papain-treated myeloma proteins. As indicated by spectrofluorometric measurements, dissociable dimers and stable dimers of the L chains of a Bence-Jones protein both underwent identical thermally induced transitions in the temperature range 48–58°C. When L polypeptide chains were present in reduced alkylated γ-globulin or reduced alkylated S fragments, no transition occurred until 65°C, the coagulation temperature of γ-globulin and S fragments. Above this temperature, L chains were released into solution. These experiments suggested that free L chains and L chains bound to Hγ chains have different conformational stabilities.

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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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