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© Melanie Blokesch, EPFL
Flagellated Vibrio cholerae
Publication : The EMBO journal

RuvAB is essential for replication forks reversal in certain replication mutants

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in The EMBO journal - 19 Jan 2006

Baharoglu Z, Petranovic M, Flores MJ, Michel B

Link to Pubmed [PMID] – 16424908

EMBO J. 2006 Feb;25(3):596-604

Inactivated replication forks may be reversed by the annealing of leading- and lagging-strand ends, resulting in the formation of a Holliday junction (HJ) adjacent to a DNA double-strand end. In Escherichia coli mutants deficient for double-strand end processing, resolution of the HJ by RuvABC leads to fork breakage, a reaction that we can directly quantify. Here we used the HJ-specific resolvase RusA to test a putative role of the RuvAB helicase in replication fork reversal (RFR). We show that the RuvAB complex is required for the formation of a RusA substrate in the polymerase III mutants dnaEts and holD, affected for the Pol III catalytic subunit and clamp loader, and in the helicase mutant rep. This finding reveals that the recombination enzyme RuvAB targets forks in vivo and we propose that it directly converts forks into HJs. In contrast, RFR occurs in the absence of RuvAB in the dnaNts mutant, affected for the processivity clamp of Pol III, and in the priA mutant, defective for replication restart. This suggests alternative pathways of RFR.

http://www.ncbi.nlm.nih.gov/pubmed/16424908