The deubiquitinating protein USP24 interacts with DDB2 and regulates DDB2 stability.

The deubiquitinating protein USP24 interacts with DDB2 and regulates DDB2 stability.
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DOI:
10.4161/cc.22688
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发表时间:
2012-12-01
期刊:
Cell cycle (Georgetown, Tex.)
影响因子:
--
通讯作者:
Gong F
Gong F
中科院分区:
其他
文献类型:
--
作者:
Zhang L;Lubin A;Chen H;Sun Z;Gong F

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损伤特异性DNA结合蛋白2(DDB 2)首先作为UV-DDB异二聚体复合物的亚基被分离,其参与核苷酸切除修复途径(NER)中的DNA损伤识别。DDB 2是有效修复染色质中CPD所必需的,并且是CRL 4DDB 2 E3连接酶的组分,其靶向XPC、组蛋白和DDB 2本身用于泛素化。在这项研究中,酵母双杂交筛选的人cDNA文库进行,以确定潜在的DDB 2细胞的合作伙伴。我们确定了一个去泛素化酶,USP 24,作为一个可能的DDB 2相互作用的合作伙伴。通过共沉淀证实DDB 2和USP 24之间的相互作用。重要的是,在两种人类细胞系中敲低USP 24降低了DDB 2的稳态水平,表明USP 24介导的DDB 2去泛素化阻止了DDB 2降解。此外,我们证明USP 24可以在体外切割DDB 2的遍在蛋白化形式。总之,我们的研究结果表明,泛素特异性蛋白酶USP 24是DDB 2稳定性的一种新的调节剂。
Damage-specific DNA-binding protein 2 (DDB2) was first isolated as a subunit of the UV-DDB heterodimeric complex that is involved in DNA damage recognition in the nucleotide excision repair pathway (NER). DDB2 is required for efficient repair of CPDs in chromatin and is a component of the CRL4DDB2 E3 ligase that targets XPC, histones and DDB2 itself for ubiquitination. In this study, a yeast two-hybrid screening of a human cDNA library was performed to identify potential DDB2 cellular partners. We identified a deubiquitinating enzyme, USP24, as a likely DDB2-interacting partner. Interaction between DDB2 and USP24 was confirmed by co-precipitation. Importantly, knockdown of USP24 in two human cell lines decreased the steady-state levels of DDB2, indicating that USP24-mediated DDB2 deubiquitination prevents DDB2 degradation. In addition, we demonstrated that USP24 can cleave an ubiquitinated form of DDB2 in vitro. Taken together, our results suggest that the ubiquitin-specific protease USP24 is a novel regulator of DDB2 stability.
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