[No authors listed]
The Schizosaccharomyces pombe Rad4/Cut5 protein is essential for DNA replication and checkpoint control. We have analyzed the behavior of the protein during unperturbed DNA replication, in different replication and checkpoint mutant backgrounds and in response to DNA-damaging agents. In an unperturbed cell cycle, Rad4 is chromatin bound and the mobility of the protein is not altered. Rad4 protein level and thus chromatin binding are dependent on a functional DNA polymerase epsilon. In response to replication arrest and DNA damage, the protein is modified in a Rad3-dependent manner. These data indicate that Rad4 undergoes diverse forms of regulation that are distinct in both DNA replication and checkpoint response.
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