Mismatch repair, but not heteroduplex rejection, is temporally coupled to DNA replication.

Mismatch repair, but not heteroduplex rejection, is temporally coupled to DNA replication.
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DOI:
10.1126/science.1210770
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发表时间:
2011-12-23
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Kolodner RD
Kolodner RD
中科院分区:
其他
文献类型:
--
作者:
Hombauer H;Srivatsan A;Putnam CD;Kolodner RD

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在真核生物中,目前尚不清楚错配修复(MMR)是否与DNA复制在时间上偶联,以及链特异性MMR如何定向。在这里,我们将酿酒酵母MSH 6与细胞周期蛋白融合,以限制Msh 2-Msh 6错配识别复合物在S期或G2/M期的可用性。Msh 6-S细胞周期蛋白融合体擅长抑制在中期S期复制的三个位点的突变,而Msh 6-G2/M细胞周期蛋白融合体是有缺陷的。然而,Msh 6-G2/M细胞周期蛋白融合在基因组的一个非常晚的复制区域对MMR有功能。相反,MMR在重组过程中的异源双链排斥功能在S期和G2/M期都有部分功能。这些结果表明,MMR的时间耦合,但不是异源双链排斥,DNA复制。
In eukaryotes, it is unknown if mismatch repair (MMR) is temporally coupled to DNA replication and how strand-specific MMR is directed. Here we fused Saccharomyces cerevisiae MSH6 with cyclins to restrict the availability of the Msh2-Msh6 mismatch recognition complex to either S-phase or G2/M. The Msh6-S cyclin fusion was proficient for suppressing mutations at three loci that replicate at mid-S-phase, whereas the Msh6-G2/M cyclin fusion was defective. However, the Msh6-G2/M cyclin fusion was functional for MMR at a very late-replicating region of the genome. In contrast, the heteroduplex rejection function of MMR during recombination was partially functional during both S-phase and G2/M. These results indicate a temporal coupling of MMR, but not heteroduplex rejection, to DNA replication.
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