Yeast Mph1 helicase dissociates Rad51-made D-loops: implications for crossover control in mitotic recombination.

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Authors

PRAKASH Rohit SATORY D. DRAY E. PAPUSHA A. SCHELLER J. KRAMER W. KREJČÍ Lumír KLEIN Hannah HABER J.E. SUNG Patrick IRA Grzegorz

Year of publication 2009
Type Article in Periodical
Magazine / Source Genes Dev.
MU Faculty or unit

Faculty of Science

Citation
Field Genetics and molecular biology
Keywords Genome instability; recombination; DNA helicase; crossing over; Fanconi anemia
Description Eukaryotes possess mechanisms to limit crossing over during homologous recombination, thus avoiding possible chromosomal rearrangements. We show here that budding yeast Mph1, an ortholog of human FancM helicase, utilizes its helicase activity to suppress spontaneous unequal sister chromatid exchanges and DNA double-strand break-induced chromosome crossovers. Since the efficiency and kinetics of break repair are unaffected, Mph1 appears to channel repair intermediates into a noncrossover pathway. Importantly, Mph1 works independently of two other helicases-Srs2 and Sgs1-that also attenuate crossing over. By chromatin immunoprecipitation, we find targeting of Mph1 to double-strand breaks in cells. Purified Mph1 binds D-loop structures and is particularly adept at unwinding these structures. Importantly, Mph1, but not a helicase-defective variant, dissociates Rad51-made D-loops. Overall, the results from our analyses suggest a new role of Mph1 in promoting the noncrossover repair of DNA double-strand breaks.
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