Ube2w and ataxin-3 coordinately regulate the ubiquitin ligase CHIP.

Ube2w and ataxin-3 coordinately regulate the ubiquitin ligase CHIP.
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DOI:
10.1016/j.molcel.2011.05.036
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发表时间:
2011-08-19
期刊:
影响因子:
16
通讯作者:
Paulson HL
Paulson HL
中科院分区:
生物学1区
文献类型:
--
作者:
Scaglione KM;Zavodszky E;Todi SV;Patury S;Xu P;Rodríguez-Lebrón E;Fischer S;Konen J;Djarmati A;Peng J;Gestwicki JE;Paulson HL

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泛素连接酶的调控机制仍然知之甚少。在这里,我们描述了一系列协调调节CHIP的分子事件,CHIP是一种与蛋白质质量控制有关的神经保护性E3。启动子E2、Ube2w和专门的脱泛素化酶(DUB)ataxin-3通过相互对立的活性参与启动、调节和终止芯片泛素化循环。Ube2w对芯片的单素化稳定了芯片与ataxin-3之间的相互作用,而ataxin-3通过其复制活性限制了连接到芯片底物上的链的长度。底物泛素化完成后,ataxin-3脱泛素芯片有效终止反应。我们的结果表明,E3与ataxin-3或类似的DUBS的功能配对代表了泛素依赖的蛋白质质量控制的一个重要调控点。此外,这些结果揭示了SCA3的疾病发病机制,SCA3是一种由ataxin-3中的多谷氨酰胺扩张引起的神经退行性疾病。
The mechanisms by which ubiquitin ligases are regulated remain poorly understood. Here we describe a series of molecular events that coordinately regulate CHIP, a neuroprotective E3 implicated in protein quality control. Through their opposing activities, the initiator E2, Ube2w, and the specialized deubiquitinating enzyme (DUB), ataxin-3, participate in initiating, regulating and terminating the CHIP ubiquitination cycle. Monoubiquitination of CHIP by Ube2w stabilizes the interaction between CHIP and ataxin-3, which through its DUB activity limits the length of chains attached to CHIP substrates. Upon completion of substrate ubiquitination ataxin-3 deubiquitinates CHIP, effectively terminating the reaction. Our results suggest that functional pairing of E3s with ataxin-3 or similar DUBs represents an important point of regulation in ubiquitin-dependent protein quality control. In addition, the results shed light on disease pathogenesis in SCA3, a neurodegenerative disorder caused by polyglutamine expansion in ataxin-3.
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