Excess Cdt1 inhibits nascent strand elongation by repressing the progression of replication forks in Xenopus egg extracts.

Excess Cdt1 inhibits nascent strand elongation by repressing the progression of replication forks in Xenopus egg extracts.
复制标题

过量的 Cdt1 通过抑制爪蟾卵提取物中复制叉的进展来抑制新生链伸长。

DOI:
10.1016/j.bbrc.2016.01.028
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发表时间:
2016
期刊:
Biochem. Biophys. Res. Commun.
影响因子:
--
通讯作者:
Tada S.
Tada S.
中科院分区:
--
文献类型:
--
作者:
Nakazaki Y;Tsuyama T;Seki M;Takahashi M;Enomoto T;Tada S.

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相似文献

Cdt 1是启动DNA复制所必需的蛋白质;它将MCM解旋酶(复制DNA解旋酶的核心组分)招募到复制起点上。在我们以前的研究中,我们发现,在Xenopusegg提取物中加入过量Cdt 1抑制DNA复制过程中新生链的延伸。在本研究中,我们研究了Cdt 1抑制作用背后的机制。我们发现,除了重组Cdt 1抑制新生的DNA合成的重新启动独立的方式。为了确定Cdt 1抑制新生链延伸的机制,检查Cdt 1对Mcm 4和Rpa 70加载到染色质上的影响。结果表明,Cdt 1抑制了由广泛的,aphidicolin诱导的DNA解旋引起的过度Rpa 70结合;这种解旋发生在停滞的DNA聚合酶和前进的复制叉之间。这些发现表明,过量Cdt 1抑制复制叉的进展。
Cdt1 is a protein essential for initiation of DNA replication; it recruits MCM helicase, a core component of the replicative DNA helicase, onto replication origins. In our previous study, we showed that addition of excess Cdt1 inhibits nascent strand elongation during DNA replication inXenopusegg extracts. In the present study, we investigated the mechanism behind the inhibitory effect of Cdt1. We found that addition of recombinant Cdt1 inhibited nascent DNA synthesis in a reinitiation-independent manner. To identify the mechanism by which Cdt1 inhibits nascent strand elongation, the effect of Cdt1 on loading of Mcm4 and Rpa70 onto chromatin was examined. The results showed that Cdt1 suppressed the excessive Rpa70 binding caused by extensive, aphidicolin-induced DNA unwinding; this unwinding occurs between stalled DNA polymerases and advancing replication forks. These findings suggested that excess Cdt1 suppressed the progression of replication forks.
DOI: 10.1016/j.cub.2004.12.002
发表时间: 2005-01-26
期刊: CURRENT BIOLOGY
影响因子: 9.2
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