CRL4-DDB1-VPRBP ubiquitin ligase mediates the stress triggered proteolysis of Mcm10.

CRL4-DDB1-VPRBP ubiquitin ligase mediates the stress triggered proteolysis of Mcm10.
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DOI:
10.1093/nar/gks366
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发表时间:
2012-08
影响因子:
14.9
通讯作者:
Saxena S
Saxena S
中科院分区:
生物学2区
文献类型:
--
作者:
Kaur M;Khan MM;Kar A;Sharma A;Saxena S

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当哺乳动物细胞经历辐射损伤时,DNA复制停止以防止错误的DNA合成。紫外线照射触发Mcm 10的蛋白水解,Mcm 10是一种重要的人类复制因子,抑制正在进行的复制。在这里,我们报告Mcm 10与E3遍在蛋白连接酶相关,该连接酶包括DNA损伤结合蛋白DDB 1、cullin、Cul 4和无名指蛋白Roc 1。DDB 1、Roc 1或Cul 4的缺失消除了UV触发的Mcm 10蛋白水解,这意味着Cul 4-Roc 1-DDB 1泛素连接酶介导Mcm 10下调。纯化的Cul 4-Roc 1-DDB 1复合物在体外泛素化Mcm 10,证明Mcm 10是其底物。通过筛选已知的DDB 1相互作用蛋白,我们发现VprBP是靶向Mcm 10降解的底物识别亚基。因此,这些结果确定Cul 4-DDB 1-VprBP泛素连接酶介导复制因子Mcm 10的应激诱导的蛋白水解。
When mammalian cells experience radiation insult, DNA replication is stalled to prevent erroneous DNA synthesis. UV-irradiation triggers proteolysis of Mcm10, an essential human replication factor, inhibiting the ongoing replication. Here, we report that Mcm10 associates with E3 ubiquitin ligase comprising DNA damage-binding protein, DDB1, cullin, Cul4 and ring finger protein, Roc1. Depletion of DDB1, Roc1 or Cul4 abrogates the UV-triggered Mcm10 proteolysis, implying that Cul4–Roc1–DDB1 ubiquitin ligase mediates Mcm10 downregulation. The purified Cul4–Roc1–DDB1 complex ubiquitinates Mcm10 in vitro, proving that Mcm10 is its substrate. By screening the known DDB1 interacting proteins, we discovered that VprBP is the substrate recognition subunit that targets Mcm10 for degradation. Hence, these results establish that Cul4–DDB1–VprBP ubiquitin ligase mediates the stress-induced proteolysis of replication factor, Mcm10.
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