The cruciform DNA-binding protein Crp1 stimulates the endonuclease activity of Mus81-Mms4 in Saccharomyces cerevisiae.

Huong Thi Thu Phung, Diem Hong Tran, Ta Xuan Nguyen

FEBS letters 2020 Dec

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The Saccharomyces cerevisiae Mus81-Mms4 complex is a highly conserved DNA structure-specific endonuclease that plays essential roles in the processing of recombination intermediates that arise during the repair of stalled replication forks and double-stranded breaks. To identify novel factors functioning conjointly with Mus81-Mms4, we performed a biochemical screen and found that Crp1, a cruciform DNA-recognizing protein that specifically binds to DNA four-way junction structures, could stimulate the Mus81-Mms4 endonuclease. The specific protein interaction between Mus81-Mms4 and Crp1 was responsible for the stimulation observed. Multicopy expression of Crp1 could partially rescue the sensitivity to DNA-damaging agents of the sgs1∆mus81∆21-24N mutant. Our results provide insight into the functional role and interaction of Crp1 with other proteins involved in DNA repair. © 2020 Federation of European Biochemical Societies.

Citation

Huong Thi Thu Phung, Diem Hong Tran, Ta Xuan Nguyen. The cruciform DNA-binding protein Crp1 stimulates the endonuclease activity of Mus81-Mms4 in Saccharomyces cerevisiae. FEBS letters. 2020 Dec;594(24):4320-4337