ATR-mediated phosphorylation of DNA polymerase η is needed for efficient recovery from UV damage.

ATR-mediated phosphorylation of DNA polymerase η is needed for efficient recovery from UV damage.
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DOI:
10.1083/jcb.201008076
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发表时间:
2011-01-24
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Lehmann AR
Lehmann AR
中科院分区:
其他
文献类型:
--
作者:
Göhler T;Sabbioneda S;Green CM;Lehmann AR

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Polη的磷酸化连接哺乳动物细胞中DNA损伤诱导的检查点激活和跨损伤合成。DNA聚合酶η(polη)属于DNA聚合酶的Y-家族,并且在UV损伤后促进跨损伤合成。我们发现,在紫外线照射后,polη在Ser 601处被共济失调-毛细血管扩张突变和Rad 3相关(ATR)激酶磷酸化。DNA损伤诱导的polη磷酸化依赖于其与Rad 18的物理相互作用,但不依赖于PCNA单泛素化。它需要polη的泛素结合结构域,但不需要其PCNA相互作用基序。polη的ATR依赖性磷酸化是着色性干皮病变异体成纤维细胞在紫外线照射后恢复正常存活和复制后修复所必需的,并且参与对紫外线损伤的检查点反应。综上所述,我们的研究结果为哺乳动物细胞中DNA损伤诱导的检查点激活和translesion合成之间的联系提供了证据。
Phosphorylation of Polη links DNA damage–induced checkpoint activation and translesion synthesis in mammalian cells. DNA polymerase η (polη) belongs to the Y-family of DNA polymerases and facilitates translesion synthesis past UV damage. We show that, after UV irradiation, polη becomes phosphorylated at Ser601 by the ataxia-telangiectasia mutated and Rad3-related (ATR) kinase. DNA damage–induced phosphorylation of polη depends on its physical interaction with Rad18 but is independent of PCNA monoubiquitination. It requires the ubiquitin-binding domain of polη but not its PCNA-interacting motif. ATR-dependent phosphorylation of polη is necessary to restore normal survival and postreplication repair after ultraviolet irradiation in xeroderma pigmentosum variant fibroblasts, and is involved in the checkpoint response to UV damage. Taken together, our results provide evidence for a link between DNA damage–induced checkpoint activation and translesion synthesis in mammalian cells.
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