Rif1 controls DNA replication by directing Protein Phosphatase 1 to reverse Cdc7-mediated phosphorylation of the MCM complex

被引:181
作者
Hiraga, Shin-ichiro [1 ]
Alvino, Gina M. [2 ]
Chang, FuJung [3 ]
Lian, Hui-yong [1 ]
Sridhar, Akila [1 ]
Kubota, Takashi [1 ]
Brewer, Bonita J. [2 ]
Weinreich, Michael [3 ]
Raghuraman, M. K. [2 ]
Donaldson, Anne D. [1 ]
机构
[1] Univ Aberdeen, Inst Med Sci, Aberdeen AB25 2ZD, Scotland
[2] Univ Washington, Dept Genome Sci, Seattle, WA 98195 USA
[3] Van Andel Res Inst, Lab Chromosome Replicat, Grand Rapids, MI 49503 USA
基金
英国生物技术与生命科学研究理事会;
关键词
DNA replication; protein phosphorylation; protein kinase; protein phosphatase; PP1; CELL-CYCLE PROGRESSION; SACCHAROMYCES-CEREVISIAE; BUDDING-YEAST; S-PHASE; MEIOTIC RECOMBINATION; REGULATORY SUBUNIT; TEMPORAL PROGRAM; ORIGIN DATABASE; TELOMERE LENGTH; RVXF MOTIF;
D O I
10.1101/gad.231258.113
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Initiation of eukaryotic DNA replication requires phosphorylation of the MCM complex by Dbf4-dependent kinase (DDK), composed of Cdc7 kinase and its activator, Dbf4. We report here that budding yeast Rif1 (Rap1-interacting factor 1) controls DNA replication genome-wide and describe how Rif1 opposes DDK function by directing Protein Phosphatase 1 (PP1)-mediated dephosphorylation of the MCM complex. Deleting RIF1 partially compensates for the limited DDK activity in a cdc7-1 mutant strain by allowing increased, premature phosphorylation of Mcm4. PP1 interaction motifs within the Rif1 N-terminal domain are critical for its repressive effect on replication. We confirm that Rif1 interacts with PP1 and that PP1 prevents premature Mcm4 phosphorylation. Remarkably, our results suggest that replication repression by Rif1 is itself also DDK-regulated through phosphorylation near the PP1-interacting motifs. Based on our findings, we propose that Rif1 is a novel PP1 substrate targeting subunit that counteracts DDK-mediated phosphorylation during replication. Fission yeast and mammalian Rif1 proteins have also been implicated in regulating DNA replication. Since PP1 interaction sites are evolutionarily conserved within the Rif1 sequence, it is likely that replication control by Rif1 through PP1 is a conserved mechanism.
引用
收藏
页码:372 / 383
页数:12
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