Ubiquitination-dependent degradation of p73 by the mitochondrial E3 ubiquitin ligase Hades

被引:11
作者
Min, Bumki [1 ]
Ryu, Jiwon [1 ]
Chi, Seung-Wook [2 ]
Yi, Gwan-Su [1 ]
机构
[1] Korea Adv Inst Sci & Technol, Dept Bio & Brain Engn, Taejon 305701, South Korea
[2] KRIBB, Struct Biol & Nanopore Res Lab, Taejon 305806, South Korea
基金
新加坡国家研究基金会;
关键词
p73; Hades; RING-finger domain; Ubiquitination; Mitochondria; P53; PROTEIN; TUMOR-SUPPRESSOR; APOPTOSIS; TRANSACTIVATION; STABILITY; DOMAIN; TAP73; DELTA-NP73; MECHANISM; PATHWAY;
D O I
10.1016/j.bbrc.2015.09.163
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
p73 is a member of the p53 family of transcription factors which plays an essential role in tumor suppression. p73 is associated with the sensitivity of cancer cells to chemotherapy and the prognosis of many cancers. In this study, we showed the ubiquitination-dependent degradation of p73 by the mitochondrial E3 ubiquitin ligase Hades. First, the binding between p73 and Hades was identified by coimmunoprecipitation experiments, and it was found that the Hades RING-finger domain mediates the interaction with p73. Immunofluorescence analysis showed that p73 moves to the mitochondria and colocalizes with Hades during etoposide-induced apoptosis. By performing in vivo and in vitro ubiquitination assays, we observed that the Hades RING-finger domain promotes ubiquitination of p73. Finally, it was shown that SiRNA-mediated depletion of Hades stabilizes p73. Taken together, our results showed that Hades mediates the ubiquitination-dependent degradation of mitochondrial p73 under apoptotic conditions. These findings suggest that Hades-mediated p73 ubiquitination is a novel regulatory mechanism for the exonuclear function of p73. (C) 2015 Elsevier Inc. All rights reserved.
引用
收藏
页码:316 / 321
页数:6
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