CK2 kinase-mediated PHF8 phosphorylation controls TopBP1 stability to regulate DNA replication.

CK2 kinase-mediated PHF8 phosphorylation controls TopBP1 stability to regulate DNA replication.
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CK2激酶介导的PHF8磷酸化控制TopBP 1稳定性以调节DNA复制。

DOI:
10.1093/nar/gkaa756
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发表时间:
2020-11-04
影响因子:
14.9
通讯作者:
Gong Z
Gong Z
中科院分区:
生物学2区
文献类型:
--
作者:
Feng H;Lu J;Song X;Thongkum A;Zhang F;Lou L;Reizes O;Almasan A;Gong Z

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ATR是dna损伤反应的主要调节器。ATR激活需要ATR激活剂拓扑异构酶i β结合蛋白1 (TopBP1)。然而,调控TopBP1的潜在机制及其调控如何影响DNA复制尚不清楚。在这里,我们报告了TopBP1和组蛋白去甲基化酶PHF8之间的特定相互作用。TopBP1/PHF8的相互作用是由TopBP1的BRCT 7+8结构域和PHF8的Ser854位点磷酸化介导的。这种相互作用是细胞周期调控和磷酸化依赖的。PHF8被CK2磷酸化,CK2调节PHF8与TopBP1的结合。重要的是,PHF8通过阻止E3连接酶UBR5介导的TopBP1泛素化和降解来调节TopBP1蛋白水平。有趣的是,PHF8pS854可能参与了TopBP1稳定性和DNA复制检查点的调控。此外,为了有效地重新启动复制分叉,TopBP1和PHF8都是必需的。总之,这些数据确定了PHF8是TopBP1结合蛋白,并提供了PHF8如何调节TopBP1稳定性以维持DNA复制的机制见解。
ATR functions as a master regulator of the DNA-damage response. ATR activation requires the ATR activator, topoisomerase IIβ-binding protein 1 (TopBP1). However, the underlying mechanism of TopBP1 regulation and how its regulation affects DNA replication remain unknown. Here, we report a specific interaction between TopBP1 and the histone demethylase PHF8. The TopBP1/PHF8 interaction is mediated by the BRCT 7+8 domain of TopBP1 and phosphorylation of PHF8 at Ser854. This interaction is cell-cycle regulated and phosphorylation-dependent. PHF8 is phosphorylated by CK2, which regulates binding of PHF8 to TopBP1. Importantly, PHF8 regulates TopBP1 protein level by preventing its ubiquitination and degradation mediated by the E3 ligase UBR5. Interestingly, PHF8pS854 is likely to contribute to regulation of TopBP1 stability and DNA replication checkpoint. Further, both TopBP1 and PHF8 are required for efficient replication fork restart. Together, these data identify PHF8 as a TopBP1-binding protein and provide mechanistic insight into how PHF8 regulates TopBP1 stability to maintain DNA replication.
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