Correlation of biochemical properties with the oligomeric state of human rad52 protein.
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.
Lloyd
Janice A
JA
Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, Massachusetts 01655-2324, USA.
Forget
Anthony L
AL
Knight
Kendall L
KL
D001483:Base Sequence; D001704:Biopolymers; D017931:DNA Primers; D004277:DNA, Single-Stranded / Q000378:metabolism; D004268:DNA-Binding Proteins / Q000737:chemistry / Q000378:metabolism*; D006801:Humans; D008854:Microscopy, Electron
D001704:Biopolymers; D017931:DNA Primers; D004277:DNA, Single-Stranded; D004268:DNA-Binding Proteins