USP7 counteracts SCFbetaTrCP- but not APCCdh1-mediated proteolysis of Claspin.

USP7 counteracts SCFbetaTrCP- but not APCCdh1-mediated proteolysis of Claspin.
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USP7抵消了SCFBETATATRCP-,但不反对APCCDH1介导的链蛋白蛋白水解。

DOI:
10.1083/jcb.200807137
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发表时间:
2009-01-12
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Mailand N
Mailand N
中科院分区:
其他
文献类型:
--
作者:
Faustrup H;Bekker-Jensen S;Bartek J;Lukas J;Mailand N

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Claspin是一种衔接蛋白,促进共济失调毛细血管扩张和Rad 3相关(ATR)介导的磷酸化和Chk 1激活,Chk 1是DNA损伤反应中的关键效应激酶。在有丝分裂和检查点恢复过程中有效终止Chk 1信号需要SCFβ TrCP依赖性破坏Claspin。在这里,我们确定去泛素化酶泛素特异性蛋白酶7(USP 7)作为一种新的调节Claspin稳定性。Claspin和USP 7在体内相互作用,并且USP 7需要维持Claspin的稳态水平。此外,USP 7介导的去泛素化显著延长了Claspin的半衰期,这反过来增加了Chk 1磷酸化的幅度和持续时间,以响应遗传毒性应激。最后,我们发现,除了M期特异性的SCFβ TrCP介导的降解外,Claspin还被后期促进复合物(APC)破坏稳定,因此在G1期保持不稳定。重要的是,我们证明USP 7特异性对抗SCFβTrCP-而不是APCCdh 1-介导的Claspin降解。因此,Claspin周转是由多种泛素化和去泛素化活动控制的,它们共同提供了一种灵活的手段来调节ATR-Chk 1通路。
Claspin is an adaptor protein that facilitates the ataxia telangiectasia and Rad3-related (ATR)-mediated phosphorylation and activation of Chk1, a key effector kinase in the DNA damage response. Efficient termination of Chk1 signaling in mitosis and during checkpoint recovery requires SCFβTrCP-dependent destruction of Claspin. Here, we identify the deubiquitylating enzyme ubiquitin-specific protease 7 (USP7) as a novel regulator of Claspin stability. Claspin and USP7 interact in vivo, and USP7 is required to maintain steady-state levels of Claspin. Furthermore, USP7-mediated deubiquitylation markedly prolongs the half-life of Claspin, which in turn increases the magnitude and duration of Chk1 phosphorylation in response to genotoxic stress. Finally, we find that in addition to the M phase–specific, SCFβTrCP-mediated degradation, Claspin is destabilized by the anaphase-promoting complex (APC) and thus remains unstable in G1. Importantly, we demonstrate that USP7 specifically opposes the SCFβTrCP- but not APCCdh1-mediated degradation of Claspin. Thus, Claspin turnover is controlled by multiple ubiquitylation and deubiquitylation activities, which together provide a flexible means to regulate the ATR–Chk1 pathway.
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