Spartan/C1orf124, a reader of PCNA ubiquitylation and a regulator of UV-induced DNA damage response.

Spartan/C1orf124, a reader of PCNA ubiquitylation and a regulator of UV-induced DNA damage response.
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DOI:
10.1016/j.molcel.2012.05.020
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发表时间:
2012-06-08
期刊:
影响因子:
16
通讯作者:
Zou, Lee
Zou, Lee
中科院分区:
生物学1区
文献类型:
--
作者:
Centore, Richard C.;Yazinski, Stephanie A.;Tse, Alice;Zou, Lee

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PCNA 是 DNA 复制和修复机制的关键组成部分。 DNA 损伤诱导的 PCNA 泛素化可作为分子标记来协调复制后修复。在这里,我们鉴定并表征了 Spartan,这是一种特异性识别泛素化 PCNA 的蛋白质,在细胞抵抗紫外线辐射方面发挥着重要作用。在体外,Spartan 通过 PIP 盒和 UBZ 结构域与泛素化 PCNA 结合。在细胞中,Spartan 被招募到紫外线损伤部位,其方式取决于 PIP 盒、UBZ 结构域和 PCNA 泛素化。此外,Spartan 与 Rad18(修饰 PCNA 的 E3 泛素连接酶)共定位并相互作用。令人惊讶的是,虽然 Spartan 是通过泛素化 PCNA 招募的,但 Spartan 的敲低会损害 Rad18 的染色质关联、PCNA 的单泛素化以及 Pol η 对紫外线损伤的定位。因此,作为泛素化 PCNA 的“读取器”,Spartan 促进意想不到的前馈循环,以增强 PCNA 泛素化和跨损伤 DNA 合成。
PCNA is a key component of DNA replication and repair machineries. DNA damage-induced PCNA ubiquitylation serves as a molecular mark to orchestrate postreplication repair. Here, we have identified and characterized Spartan, a protein that specifically recognizes ubiquitylated PCNA and plays an important role in cellular resistance to UV radiation. In vitro, Spartan engages ubiquitylated PCNA via both a PIP box and a UBZ domain. In cells, Spartan is recruited to sites of UV damage in a manner dependent upon the PIP box, the UBZ domain, and PCNA ubiquitylation. Furthermore, Spartan colocalizes and interacts with Rad18, the E3 ubiquitin ligase that modifies PCNA. Surprisingly, while Spartan is recruited by ubiquitylated PCNA, knockdown of Spartan compromised chromatin association of Rad18, monoubiquitylation of PCNA, and localization of Pol η to UV damage. Thus, as a “reader” of ubiquitylated PCNA, Spartan promotes an unexpected feed-forward loop to enhance PCNA ubiquitylation and translesion DNA synthesis.
DOI: 10.1016/j.molcel.2005.11.025
发表时间: 2006-01-20
期刊: MOLECULAR CELL
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