BAG5 protects against mitochondrial oxidative damage through regulating PINK1 degradation.

BAG5 protects against mitochondrial oxidative damage through regulating PINK1 degradation.
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BAG5 通过调节 PINK1 降解来防止线粒体氧化损伤

DOI:
10.1371/journal.pone.0086276
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发表时间:
2014
期刊:
影响因子:
3.7
通讯作者:
Tang B
Tang B
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Wang X;Guo J;Fei E;Mu Y;He S;Che X;Tan J;Xia K;Zhang Z;Wang G;Tang B

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PTEN 诱导的激酶 1 (PINK1) 基因突变会导致 PARK6 家族性帕金森病,PINK1 稳定性的丧失也可能导致散发性帕金森病 (PD)。 PINK1 的降解主要通过泛素蛋白酶体系统 (UPS) 发生,然而,迄今为止,很少有蛋白质被发现可以调节 PINK1 的降解。使用酵母双杂交系统和下拉方法,我们鉴定了 bcl-2 相关的 athanogene 5 (BAG5)(BAG 家族成员)直接与 PINK1 相互作用。我们发现 BAG5 通过降低 PINK1 的泛素化来稳定 PINK1。有趣的是,BAG5 通过在体外上调 PINK1 来挽救 MPP+- 和鱼藤酮诱导的线粒体功能障碍。在 PINK1 缺失小鼠和 MPTP 治疗小鼠中,尽管 PINK1 减少,但黑质致密部 (SNpc) 中的 BAG5 显着增加。我们的研究结果表明,BAG5 作为稳定 PINK1 的关键蛋白,是预防氧化应激后线粒体功能障碍的有前途的治疗工具。
Mutations in PTEN-induced kinase 1 (PINK1) gene cause PARK6 familial Parkinsonism, and loss of the stability of PINK1 may also contribute to sporadic Parkinson's disease (PD). Degradation of PINK1 occurs predominantly through the ubiquitin proteasome system (UPS), however, to date, few of the proteins have been found to regulate the degradation of PINK1. Using the yeast two-hybrid system and pull-down methods, we identified bcl-2-associated athanogene 5 (BAG5), a BAG family member, directly interacted with PINK1. We showed that BAG5 stabilized PINK1 by decreasing the ubiquitination of PINK1. Interestingly, BAG5 rescued MPP+- and rotenone-induced mitochondria dysfunction by up-regulating PINK1 in vitro. In PINK1-null mice and MPTP-treated mice, BAG5 significantly increased in the substantia nigra pars compacta (SNpc) although PINK1 was decreased. Our findings indicated that BAG5, as a key protein to stabilize PINK1, is a promising therapeutic tool for preventing mitochondrial dysfunction following oxidative stress.
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