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UspB, a member of the sigma-S regulon, facilitates RuvC resolvase function.

Journal article
Authors Örjan Persson
Thomas Nyström
Anne Farewell
Published in DNA repair
Volume 9
Issue 11
Pages 1162-9
ISSN 1568-7856
Publication year 2010
Published at Department of Cell and Molecular Biology, Microbiology
Pages 1162-9
Language en
Subject categories Molecular biology, Genetics


A growing body of evidence shows that there is an intimate connection between proteins required for genome stability and stationary phase survival. In this work we show that the integral membrane protein UspB, a member of the RpoS regulon, is required for proper DNA repair as mutants lacking uspB are hypersensitive to several DNA damaging agents including ultraviolet light, mitomycin C, bleomycin and ciprofloxacin. Genetic and physical studies demonstrate that UspB acts in the RuvABC recombination repair pathway and removing uspB creates a phenocopy of the Holliday junction resolvase mutant, ruvC. Further, we show that the uspB mutant phenotype can be suppressed by ectopic overproduction of RuvC and that both ruvC and uspB mutants can be suppressed by inactivating recD. The fact that RuvABC-dependent repair requires UspB for proper activity suggests that the sigma-S regulon works together with DNA repair pathways under stress conditions to defend the cell against genotoxic stress.

Page Manager: Webmaster|Last update: 9/11/2012

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