Reversible inactivation of deubiquitinases by reactive oxygen species in vitro and in cells.

Reversible inactivation of deubiquitinases by reactive oxygen species in vitro and in cells.
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DOI:
10.1038/ncomms2532
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发表时间:
2013
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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在真核生物中,去泛素化酶(DUBs)从不同的底物中去除泛素缀合物,改变其稳定性,定位或活性。在这里,我们表明,许多DUBs的USP和UCH亚家族可以可逆地失活后,在体外和细胞中的活性氧氧化。氧化优先发生在催化性半胱氨酸上,消除了异肽裂解活性而不影响这些酶对泛素的亲和力。对氧化抑制的敏感性与DUB活化相关,其中活性位点半胱氨酸转化为易于氧化的去质子化状态。我们证明,这种氧化还原调节是必不可少的单泛素化的增殖细胞核抗原在氧化DNA损伤,启动DNA损伤耐受程序。这些发现建立了一种新的DUB调节机制,该机制可能与其他氧化还原依赖性信号通路整合,以控制细胞对氧化应激的适应,这一过程与衰老和癌症密切相关。 去泛素化酶调节蛋白质的稳定性、定位和活性,然而控制其活性的机制仍然知之甚少。Lee等人表明,这些酶通过催化半胱氨酸残基的氧化被活性氧物质可逆地抑制。
In eukaryotes, deubiquitinases (DUBs) remove ubiquitin conjugates from diverse substrates, altering their stabilities, localizations or activities. Here we show that many DUBs of the USP and UCH subfamilies can be reversibly inactivated upon oxidation by reactive oxygen species in vitro and in cells. Oxidation occurs preferentially on the catalytic cysteine, abrogating the isopeptide-cleaving activity without affecting these enzymes’ affinity to ubiquitin. Sensitivity to oxidative inhibition is associated with DUB activation wherein the active site cysteine is converted to a deprotonated state prone to oxidation. We demonstrate that this redox regulation is essential for mono-ubiquitination of proliferating-cell nuclear antigen in response to oxidative DNA damage, which initiates a DNA damage-tolerance programme. These findings establish a novel mechanism of DUB regulation that may be integrated with other redox-dependent signalling circuits to govern cellular adaptation to oxidative stress, a process intimately linked to aging and cancer. Deubiquitinases regulate protein stability, localization and activity, and yet the mechanisms controlling their activity remain poorly understood. Lee et al. show that these enzymes are reversibly inhibited by reactive oxygen species through oxidation of catalytic cysteine residues.
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