Localization of recombination proteins and Srs2 reveals anti-recombinase function in vivo

Rebecca C. Burgess, Michael Lisby, Veronika Altmannova, Lumir Krejci, Patrick Sung, Rodney Rothstein

Research output: Contribution to journalArticlepeer-review

63 Scopus citations


Homologous recombination (HR), although an important DNA repair mechanism, is dangerous to the cell if improperly regulated. The Srs2 " antirecombinase" restricts HR by disassembling the Rad51 nucleoprotein filament, an intermediate preceding the exchange of homologous DNA strands. Here, we cytologically characterize Srs2 function in vivo and describe a novel mechanism for regulating the initiation of HR. We find that Srs2 is recruited separately to replication and repair centers and identify the genetic requirements for recruitment. In the absence of Srs2 activity, Rad51 foci accumulate, and surprisingly, can form in the absence of Rad52 mediation. However, these Rad51 foci do not represent repair-proficient filaments, as determined by recombination assays. Antagonistic roles for Rad52 and Srs2 in Rad51 filament formation are also observed in vitro. Furthermore, we provide evidence that Srs2 removes Rad51 indiscriminately from DNA, while the Rad52 protein coordinates appropriate filament reformation. This constant breakdown and rebuilding of filaments may act as a stringent quality control mechanism during HR.

Original languageEnglish (US)
Pages (from-to)969-981
Number of pages13
JournalJournal of Cell Biology
Issue number6
StatePublished - Jun 15 2009
Externally publishedYes

ASJC Scopus subject areas

  • Cell Biology


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