Mrc1 and DNA polymerase epsilon function together in linking DNA replication and the S phase checkpoint.

Mrc1 and DNA polymerase epsilon function together in linking DNA replication and the S phase checkpoint.
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DOI:
10.1016/j.molcel.2008.08.020
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发表时间:
2008-10-10
期刊:
影响因子:
16
通讯作者:
Campbell, Judith L.
Campbell, Judith L.
中科院分区:
生物学1区
文献类型:
--
作者:
Lou, Huiqiang;Komata, Makiko;Katou, Yuki;Guan, Zhiyun;Reis, Clara C.;Budd, Martin;Shirahige, Katsuhiko;Campbell, Judith L.

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酵母Mrc 1是后生动物Claspin的直系同源物,是正常DNA复制叉的中心组分和S期检查点的介体。我们报告Mrc 1与Pol 2相互作用,Pol 2是DNA聚合酶ε的催化亚基,对前导链DNA复制和检查点至关重要。在未受干扰的细胞中,Mrc 1独立地与Pol 2的N-末端和C-末端的一半(Pol 2N和Pol 2C)相互作用。引人注目的是,在S期检查点Mrc 1的磷酸化废除Pol 2N结合,但不是Pol 2C相互作用。需要Mrc 1来稳定HU中停滞的复制叉处的Pol 2。双峰Mrc 1/Pol 2相互作用可能确定了一个新的步骤,在调节S期检查点响应DNA损伤的前导链。我们建议,Mrc 1,这也与MCMs相互作用,可以调节聚合和解旋在复制叉耦合。
Yeast Mrc1, ortholog of metazoan Claspin, is both a central component of normal DNA replication forks and a mediator of the S phase checkpoint. We report that Mrc1 interacts with Pol2, the catalytic subunit of DNA polymerase ε, essential for leading strand DNA replication and for the checkpoint. In unperturbed cells, Mrc1 interacts independently with both the N-terminal and C-terminal halves of Pol2 (Pol2N and Pol2C). Strikingly, phosphorylation of Mrc1 during the S phase checkpoint abolishes Pol2N binding but not Pol2C interaction. Mrc1 is required to stabilize Pol2 at replication forks stalled in HU. The bimodal Mrc1/Pol2 interaction may identify a novel step in regulating the S phase checkpoint response to DNA damage on the leading strand. We propose that Mrc1, which also interacts with the MCMs, may modulate coupling of polymerization and unwinding at the replication fork.
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