RNF4 controls the extent of replication fork reversal to preserve genome stability.

RNF4 controls the extent of replication fork reversal to preserve genome stability.
复制标题

RNF4 控制复制叉逆转的程度以保持基因组稳定性。

DOI:
10.1093/nar/gkac447
复制
发表时间:
2022-06-10
影响因子:
14.9
通讯作者:
Huang, Jun
Huang, Jun
中科院分区:
生物学2区
文献类型:
--
作者:
Ding, Linli;Luo, Yi;Tian, Tian;Chen, Xu;Yang, Yulan;Bu, Min;Han, Jinhua;Yang, Bing;Yan, Haiyan;Liu, Ting;Wu, Mengjie;Zhang, Guofei;Xu, Yipeng;Zhu, Shaoxing;Huen, Michael S. Y.;Mao, Genxiang;Huang, Jun

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复制叉反转通过两步过程发生,该过程需要反转启动和反转扩展。 DNA 拓扑异构酶 IIalpha (TOP2A) 一方面通过解决初始逆转产生的拓扑应力,另一方面通过其在将 SUMO 靶向 DNA 易位酶 PICH 募集到停滞的分叉中的作用,从而促进广泛的分叉逆转,这种作用取决于 SUMO E3 连接酶 ZATT 对其进行 SUMO 化。然而,人们对 TOP2A 在停滞分叉上的活动如何进行精确调控仍然知之甚少。在这里,我们表明,在复制压力下,SUMO 靶向泛素 E3 连接酶 RNF4 在停滞的叉处积聚,并靶向 SUMO 化的 TOP2A 进行泛素化和降解。 RNF4 的下调导致 ZATT-TOP2A-PICH 复合物在停滞的叉处异常激活,进而导致过度逆转和叉塌陷频率升高。这些结果揭示了一种先前未知的调节机制,该机制调节停滞分叉处的 TOP2A 活动,从而调节分叉反转的程度。
Replication fork reversal occurs via a two-step process that entails reversal initiation and reversal extension. DNA topoisomerase IIalpha (TOP2A) facilitates extensive fork reversal, on one hand through resolving the topological stress generated by the initial reversal, on the other hand via its role in recruiting the SUMO-targeted DNA translocase PICH to stalled forks in a manner that is dependent on its SUMOylation by the SUMO E3 ligase ZATT. However, how TOP2A activities at stalled forks are precisely regulated remains poorly understood. Here we show that, upon replication stress, the SUMO-targeted ubiquitin E3 ligase RNF4 accumulates at stalled forks and targets SUMOylated TOP2A for ubiquitination and degradation. Downregulation of RNF4 resulted in aberrant activation of the ZATT–TOP2A–PICH complex at stalled forks, which in turn led to excessive reversal and elevated frequencies of fork collapse. These results uncover a previously unidentified regulatory mechanism that regulates TOP2A activities at stalled forks and thus the extent of fork reversal.
人RECQ5BETA解旋酶在合成DNA结构上促进链交换,类似于停滞的复制叉。
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