Ube2w and ataxin-3 coordinately regulate the ubiquitin ligase CHIP.
Ube2w and ataxin-3 coordinately regulate the ubiquitin ligase CHIP.
复制标题
DOI:
10.1016/j.molcel.2011.05.036
复制
发表时间:
2011-08-19
期刊:
影响因子:
16
通讯作者:
Paulson HL
中科院分区:
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
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.
登录
查看更多内容
DOI:
10.1073/pnas.0510664103
发表时间:
2006-02-07
影响因子:
11.1
作者:
Gallagher, E;Gao, M;Karin, M
通讯作者:
Karin, M
影响因子:
21.3
作者:
Connell, P;Ballinger, CA;Patterson, C
通讯作者:
Patterson, C
影响因子:
4.8
作者:
Jiang, JH;Ballinger, CA;Patterson, C
通讯作者:
Patterson, C
影响因子:
3.5
作者:
Burnett, B;Li, FS;Pittman, RN
通讯作者:
Pittman, RN
影响因子:
11.4
作者:
Kim, Hyoung Tae;Kim, Kwang Pyo;Goldberg, Alfred L.
通讯作者:
Goldberg, Alfred L.