De-ubiquitinating protease USP2a targets RIP1 and TRAF2 to mediate cell death by TNF.

De-ubiquitinating protease USP2a targets RIP1 and TRAF2 to mediate cell death by TNF.
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DOI:
10.1038/cdd.2011.185
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发表时间:
2012-05
影响因子:
12.4
通讯作者:
--
中科院分区:
生物学1区
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--
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TNFR 1复合物的组分受到动态泛素化的影响,这影响了它们作为信号传导因子的作用。我们已经发现,泛素特异性蛋白酶USP 2a在TNFR 1复合物决定细胞死亡或存活方面具有关键作用。这种酶是TNFR 1复合物的一种新组分,其在配体结合后被募集,并通过去除其K63连接的泛素链来控制TNFR 1相互作用蛋白RIP 1的信号传导活性。USP 2a同样去泛素化TRAF 2,一种被募集到TNFR 1复合物的泛素连接酶。在TNF应答过程中,USP 2a对RIP 1和TRAF 2的活性是IκBα有效再现所必需的,IκBα是抑制抗凋亡转录因子NF-κB的必需的。USP 2a的作用最终导致抗凋亡TNFR 1复合物I转化为促凋亡TNFR 1复合物II。因此,USP 2a的下调促进NF-κB活化并保护细胞免受TNF诱导的细胞死亡。
Components of the TNFR1 complex are subject to dynamic ubiquitination that impacts on their effects as signalling factors. We have found that the ubiquitin-specific protease USP2a has a pivotal role in the decision for cell death or survival by the TNFR1 complex. This enzyme is a novel component of the TNFR1 complex that is recruited upon ligand binding and controls the signalling activity of the TNFR1-interacting protein RIP1 by removing its K63-linked ubiquitin chains. USP2a likewise de-ubiquitinates TRAF2, a ubiquitin-ligase recruited to the TNFR1 complex. During the TNF response the activity of USP2a on RIP1 and TRAF2 is required for the efficient reappearance of IκBα which is essential to inactivate the anti-apoptotic transcription factor NF-κB. The effects of USP2a culminate in the conversion of the anti-apoptotic TNFR1 complex I into the pro-apoptotic TNFR1 complex II. Consequently, downregulation of USP2a promotes NF-κB activation and protects cells against TNF-induced cell death.
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