HERC2-USP20 axis regulates DNA damage checkpoint through Claspin

HERC2-USP20 axis regulates DNA damage checkpoint through Claspin
复制标题

HERC2-USP20 轴通过 Claspin 调节 DNA 损伤检查点

DOI:
10.1093/nar/gku1034
复制
发表时间:
2014-10
影响因子:
14.9
通讯作者:
ZhenkunLou
ZhenkunLou
中科院分区:
生物学2区
文献类型:
--
作者:
JianYuan;KuntianLou(罗坤甜);MinDeng;YunhuiLi;PingYin;BowenGao;YuanFang;PuqiangWu;TongzhengLiu;ZhenkunLou

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DNA损伤反应使用多个翻译后修饰作为分子开关触发细胞周期检查点、DNA修复和凋亡。然而,泛素化是如何调节ATR信号对复制应激和单链断裂的反应仍然不清楚。在这里,我们确定了去泛素化酶(DUB)USP 20作为ATR相关DDR途径的关键调节因子。通过筛选一组DUB,我们确定USP 20对复制应激反应至关重要。USP 20被ATR磷酸化,导致E3泛素连接酶HERC 2与USP 20解离和USP 20稳定。USP 20反过来去泛素化和稳定Claspin,并增强ATR-Chk 1信号转导的激活。这些发现揭示USP 20是ATR依赖性DNA损伤信号传导的新调节剂。
The DNA damage response triggers cell-cycle checkpoints, DNA repair and apoptosis using multiple post-translational modifications as molecular switches. However, how ubiquitination regulates ATR signaling in response to replication stress and single-strand break is still unclear. Here, we identified the deubiquitination enzyme (DUB) USP20 as a pivotal regulator of ATR-related DDR pathway. Through screening a panel of DUBs, we identified USP20 as critical for replication stress response. USP20 is phosphorylated by ATR, resulting in disassociation of the E3 ubiquitin ligase HERC2 from USP20 and USP20 stabilization. USP20 in turn deubiquitinates and stabilizes Claspin and enhances the activation of ATR-Chk1 signaling. These findings reveal USP20 to be a novel regulator of ATR-dependent DNA damage signaling.
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