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Hsk1-Dfp1/Him1, the Cdc7-Dbf4 kinase in Schizosaccharomyces pombe, associates with Swi1, a component of the replication fork protection complex.

J Biol Chem. 2005 Dec 30;280(52):42536-42. Epub 2005 Oct 31
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摘要


The protein kinase Hsk1 is essential for DNA replication in Schizosaccharomyces pombe. It associates with Dfp1/Him1 to form an active complex equivalent to the Cdc7-Dbf4 protein kinase in Saccharomyces cerevisiae. Swi1 and Swi3 are subunits of the replication fork protection complex in S. pombe that is homologous to the Tof1-Csm3 complex in S. cerevisiae. The fork protection complex helps to preserve the integrity of stalled replication forks and is important for activation of the checkpoint protein kinase Cds1 in response to fork arrest. Here we describe physical and genetic interactions involving Swi1 and Hsk1-Dfp1/Him1. Dfp1/Him1 was identified in a yeast two-hybrid screen with Swi1. Hsk1 and Dfp1/Him1 both co-immunoprecipitate with Swi1. Swi1 is required for growth of a temperature-sensitive hsk1 (hsk1ts) mutant at its semi-permissive temperature. Hsk1ts cells accumulate Rad22 (Rad52 homologue) DNA repair foci at the permissive temperature, as previously observed in swi1 cells, indicating that abnormal single-stranded DNA regions form near the replication fork in hsk1ts cells. hsk1ts cells were also unable to properly delay S-phase progression in the presence of a DNA alkylating agent and were partially defective in mating type switching. These data suggest that Hsk1-Dfp1/Him1 and Swi1-Swi3 complexes have interrelated roles in stabilization of arrested replication forks.

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