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:
影响因子:
--
通讯作者:
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.
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.
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--
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期刊:
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影响因子:
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