Human RECQ1 promotes restart of replication forks reversed by DNA topoisomerase I inhibition.

Human RECQ1 promotes restart of replication forks reversed by DNA topoisomerase I inhibition.
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DOI:
10.1038/nsmb.2501
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发表时间:
2013-03
影响因子:
16.8
通讯作者:
Vindigni, Alessandro
Vindigni, Alessandro
中科院分区:
生物学1区
文献类型:
--
作者:
Berti, Matteo;Chaudhuri, Arnab Ray;Thangavel, Saravanabhavan;Gomathinayagam, Shivasankari;Kenig, Sasa;Vujanovic, Marko;Odreman, Federico;Glatter, Timo;Graziano, Simona;Mendoza-Maldonado, Ramiro;Marino, Francesca;Lucic, Bojana;Biasin, Valentina;Gstaiger, Matthias;Aebersold, Ruedi;Sidorova, Julia M.;Monnat, Raymond J., Jr.;Lopes, Massimo;Vindigni, Alessandro

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拓扑异构酶I(TOP1)抑制剂是一类重要的抗癌药物。TOP1抑制剂的细胞毒性可以通过复制叉逆转来调节,该过程需要PARP活性。回归的分叉是否可以有效地重新启动,以及在分叉反转后重新启动分叉进程所需的因素仍然是未知的。在这里,我们结合了生物化学和电子显微镜方法与单分子DNA纤维分析,以确定人类RECQ 1解旋酶在TOP1抑制后复制叉重新启动中的关键作用,而不是其他人类RecQ蛋白所共有的。我们发现,聚(ADPribosyl)化活动的PARP1稳定叉在其回归状态,限制他们重新启动RECQ1。这些研究为RECQ1和PARP在DNA复制中的作用提供了新的机制见解,并提供了基于TOP1抑制的增强化疗方案的分子视角。
Topoisomerase I (TOP1) inhibitors are an important class of anticancer drugs. The cytotoxicity of TOP1 inhibitors can be modulated by replication fork reversal, in a process that requires PARP activity. Whether regressed forks can efficiently restart and the factors required to restart fork progression after fork reversal are still unknown. Here we combined biochemical and electron microscopy approaches with single-molecule DNA fiber analysis, to identify a key role for human RECQ1 helicase in replication fork restart after TOP1 inhibition, not shared by other human RecQ proteins. We show that the poly(ADPribosyl)ation activity of PARP1 stabilizes forks in their regressed state by limiting their restart by RECQ1. These studies provide new mechanistic insights into the roles of RECQ1 and PARP in DNA replication and offer molecular perspectives to potentiate chemotherapeutic regimens based on TOP1 inhibition.
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