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Papers In Press, published online ahead of print December 13, 2001
J. Biol. Chem, 10.1074/jbc.M108306200
Submitted on August 28, 2001
Revised on December 11, 2001
Accepted on December 12, 2001
Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, CA 94550
Corresponding Author: albala1{at}llnl.gov
RAD51B and RAD51C are two of five known paralogs of the human RAD51 protein which are thought to function in both homologous recombination and DNA double-strand break repair. This work describes the in vitro and in vivo identification of the RAD51B/RAD51C heterocomplex. The RAD51B/RAD51C heterocomplex was isolated and purified by immunoaffinity chromatography from insect cells co-expressing the recombinant proteins. Moreover, co-immunoprecipitation of the RAD51B and RAD51C proteins from HeLa, MCF10A, and MCF7 cells strongly suggests the existence of an endogenous RAD51B/RAD51C heterocomplex. We extended these observations to examine the interaction between the RAD51B/RAD51C complex and the other RAD51 paralogs. Immunoprecipitation using protein-specific antibodies showed that RAD51C is central to a single, large protein complex and/or several smaller complexes with RAD51B, RAD51D, XRCC2, and XRCC3. However, our experiments showed no evidence for the inclusion of RAD51 within these complexes. Further analysis is required to elucidate the function of the RAD51B/RAD51C heterocomplex and its association with the other RAD51 paralogs in the processes of homologous recombination and DNA double-strand break repair.
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