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Originally published In Press as doi:10.1074/jbc.M207262200 on September 10, 2002

J. Biol. Chem., Vol. 277, Issue 48, 46172-46178, November 29, 2002
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Correlation of Biochemical Properties with the Oligomeric State of Human Rad52 Protein*

Janice A. Lloyd, Anthony L. Forget, and Kendall L. KnightDagger

From the Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01655-2324

The human Rad52 protein self-associates to form ring-shaped oligomers, as well as higher order complexes of these rings. We have shown previously that there are two experimentally separable self-association domains in HsRad52, one in the N terminus (residues 1-192) responsible for assembly of individual subunits into rings, and one in the C terminus (residues 218-418) responsible for higher order oligomerization of rings. Earlier studies suggest that the higher order complexes promote DNA end-joining, and others suggest that these complexes are relevant to in vivo Rad52 function. In this study we demonstrate that although inherent binding to single-stranded DNA depends on neither higher order complexes of Rad52 rings nor the ring-shaped oligomers themselves, higher order complexes are important for activities involving simultaneous interaction with more than one DNA molecule. This provides biochemical support for what may be an important in vivo function of Rad52.

* This work was supported in part by Grant GM44772 from the National Institutes of Health (to K. L. K.) and by a Worcester Foundation for Biomedical Research Annual Research Fund Innovation Grant (to K. L. K.).The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Dagger To whom correspondence should be addressed: Dept. of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Aaron Lazare Medical Research Bldg., 364 Plantation St., Worcester, MA 01655-2324. Tel.: 508-856-2405; Fax: 508-856-6231; E-mail: kendall.knight@umassmed.edu.

Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.
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Copyright © 2002 by the American Society for Biochemistry and Molecular Biology.