Separable functions of Tof1/Timeless in intra-S-checkpoint signalling, replisome stability and DNA topological stress.

Separable functions of Tof1/Timeless in intra-S-checkpoint signalling, replisome stability and DNA topological stress.
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DOI:
10.1093/nar/gkaa963
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发表时间:
2020-12-02
影响因子:
14.9
通讯作者:
Baxter J
Baxter J
中科院分区:
生物学2区
文献类型:
--
作者:
Westhorpe R;Keszthelyi A;Minchell NE;Jones D;Baxter J

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高度保守的Tof 1/Timeless蛋白最小化复制应激并促进正常DNA复制。它们介导DNA复制检查点(DRC)、叉在蛋白质叉块处的稳定暂停、复制应激(RS)期间DNA解旋酶和聚合酶功能的偶联以及叉前DNA拓扑应激的优先解决。在这里,我们表明,在DRC信号和分辨率的DNA拓扑应力的酿酒酵母永恒蛋白Tof 1的作用需要不同的N和C末端区域的蛋白质,而Tof 1的其他功能是紧密相连的Tof 1和它的组成性结合伙伴Csm 3/Tipin之间的稳定相互作用。通过将Tof 1在DRC中的作用与叉稳定和偶联分开,我们表明Tof 1在检查点激活和复制体稳定性方面具有不同的活性,以确保复制应激后DNA复制的可行完成。
The highly conserved Tof1/Timeless proteins minimise replication stress and promote normal DNA replication. They are required to mediate the DNA replication checkpoint (DRC), the stable pausing of forks at protein fork blocks, the coupling of DNA helicase and polymerase functions during replication stress (RS) and the preferential resolution of DNA topological stress ahead of the fork. Here we demonstrate that the roles of the Saccharomyces cerevisiae Timeless protein Tof1 in DRC signalling and resolution of DNA topological stress require distinct N and C terminal regions of the protein, whereas the other functions of Tof1 are closely linked to the stable interaction between Tof1 and its constitutive binding partner Csm3/Tipin. By separating the role of Tof1 in DRC from fork stabilisation and coupling, we show that Tof1 has distinct activities in checkpoint activation and replisome stability to ensure the viable completion of DNA replication following replication stress.
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