Human Rev1 polymerase disrupts G-quadruplex DNA.

Human Rev1 polymerase disrupts G-quadruplex DNA.
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DOI:
10.1093/nar/gkt1314
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发表时间:
2014-03
影响因子:
14.9
通讯作者:
Eoff RL
Eoff RL
中科院分区:
生物学2区
文献类型:
--
作者:
Eddy S;Ketkar A;Zafar MK;Maddukuri L;Choi JY;Eoff RL

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在高等真核生物中,y家族DNA聚合酶Rev1是g -四重体DNA (G4 DNA)成功复制所必需的。在这里,我们表明人类Rev1 (hRev1)破坏G4 DNA结构并阻止体外再折叠。hRev1的核苷酸转移不是发生机械展开所必需的。hRev1结合G4 DNA底物的Kd值比非G4 DNA底物低4 - 15倍。与非g4 DNA底物相比,hRev1将脱氧胞苷单磷酸(dCMP)插入第一四鸟嘌呤的预稳态速率常数为~ 56%。因此,hRev1可以通过移除四聚鸟嘌呤来展开G4 DNA,这有助于其他DNA聚合酶的延伸,或者hRev1可以阻止G4 DNA结构的再折叠,从而促进叉子的进展。hRev1对g -四重体的作用机制有助于解释为什么rev1缺陷细胞中G4 DNA位点的复制过程受到阻碍,并阐明了该酶的另一个独特特征,对基因组维持具有重要意义。
The Y-family DNA polymerase Rev1 is required for successful replication of G-quadruplex DNA (G4 DNA) in higher eukaryotes. Here we show that human Rev1 (hRev1) disrupts G4 DNA structures and prevents refolding in vitro. Nucleotidyl transfer by hRev1 is not necessary for mechanical unfolding to occur. hRev1 binds G4 DNA substrates with Kd,DNA values that are 4–15-fold lower than those of non-G4 DNA substrates. The pre-steady-state rate constant of deoxycytidine monophosphate (dCMP) insertion opposite the first tetrad-guanine by hRev1 is ∼56% as fast as that observed for non-G4 DNA substrates. Thus, hRev1 can promote fork progression by either dislodging tetrad guanines to unfold the G4 DNA, which could assist in extension by other DNA polymerases, or hRev1 can prevent refolding of G4 DNA structures. The hRev1 mechanism of action against G-quadruplexes helps explain why replication progress is impeded at G4 DNA sites in Rev1-deficient cells and illustrates another unique feature of this enzyme with important implications for genome maintenance.
DOI: 10.1038/nrg3296
发表时间: 2012-11
期刊: Nature reviews. Genetics
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