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Nucleic Acids Research Advance Access originally published online on November 5, 2008
Nucleic Acids Research 2008 36(22):7029-7042; doi:10.1093/nar/gkn795
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Nucleic Acids Research, 2008, Vol. 36, No. 22 7029-7042
© 2008 The Author(s)
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Nucleic Acid Enzymes

RecG interacts directly with SSB: implications for stalled replication fork regression

Jackson A. Buss1,2, Yuji Kimura1,2 and Piero R. Bianco1,2,3,*

1Department of Microbiology and Immunology, 2Center for Single Molecule Biophysics and 3Department of Biochemistry, University at Buffalo, Buffalo, NY 14214 USA

*To whom correspondence should be addressed. Tel: +1 716 829-2599; Fax: +1 716 829-2158; Email: pbianco{at}buffalo.edu

Received August 1, 2008. Revised September 9, 2008. Accepted October 12, 2008.

RecG and RuvAB are proposed to act at stalled DNA replication forks to facilitate replication restart. To define the roles of these proteins in fork regression, we used a combination of assays to determine whether RecG, RuvAB or both are capable of acting at a stalled fork. The results show that RecG binds to the C-terminus of single-stranded DNA binding protein (SSB) forming a stoichiometric complex of 2 RecG monomers per SSB tetramer. This binding occurs in solution and to SSB protein bound to single stranded DNA (ssDNA). The result of this binding is stabilization of the interaction of RecG with ssDNA. In contrast, RuvAB does not bind to SSB. Side-by-side analysis of the catalytic efficiency of the ATPase activity of each enzyme revealed that (–)scDNA and ssDNA are potent stimulators of the ATPase activity of RecG but not for RuvAB, whereas relaxed circular DNA is a poor cofactor for RecG but an excellent one for RuvAB. Collectively, these data suggest that the timing of repair protein access to the DNA at stalled forks is determined by the nature of the DNA available at the fork. We propose that RecG acts first, with RuvAB acting either after RecG or in a separate pathway following protein-independent fork regression.


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