Nucleic Acids Research, 2002, Vol. 30, No. 4 1001-1008
© 2002 Oxford University Press
Interactions involving the Rad51 paralogs Rad51C and XRCC3 in human cells
Life Sciences Division, 1 Cyclotron Road, Mailstop 70A-1118, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA and 1Biology and Biotechnology Research Program, Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
Homologous recombinational repair of DNA double-strand breaks and crosslinks in human cells is likely to require Rad51 and the five Rad51 paralogs (XRCC2, XRCC3, Rad51B/Rad51L1, Rad51C/Rad51L2 and Rad51D/Rad51L3), as has been shown in chicken and rodent cells. Previously, we reported on the interactions among these proteins using baculovirus and two- and three-hybrid yeast systems. To test for interactions involving XRCC3 and Rad51C, stable human cell lines have been isolated that express (His)6-tagged versions of XRCC3 or Rad51C. Ni2+-binding experiments demonstrate that XRCC3 and Rad51C interact in human cells. In addition, we find that Rad51C, but not XRCC3, interacts directly or indirectly with Rad51B, Rad51D and XRCC2. These results argue that there are at least two complexes of Rad51 paralogs in human cells (Rad51CXRCC3 and Rad51BRad51CRad51DXRCC2), both containing Rad51C. Moreover, Rad51 is not found in these complexes. X-ray treatment did not alter either the level of any Rad51 paralog or the observed interactions between paralogs. However, the endogenous level of Rad51C is moderately elevated in the XRCC3-overexpressing cell line, suggesting that dimerization between these proteins might help stabilize Rad51C.
* To whom correspondence should be addressed. Tel: +1 510 486 6013; Fax: +1 510 486 4475; Email: dschild{at}lbl.gov Present address: Claudia Wiese, GSI/Biophysics, Planckstrasse 1, D-64921 Darmstadt, Germany The authors wish it to be known that, in their opinion, the first two authors should be regarded as joint First Authors
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