Mitochondrial E3 Ligase MARCH5 Regulates FUNDC1 to Fine-tune Hypoxic Mitophagy

Overview

Journal EMBO Rep

Specialty Molecular Biology

Date 2017 Jan 21

PMID 28104734

Citations 153

Authors

Ziheng Chen

Lei Liu

Qi Cheng

Yanjun Li

Hao Wu

Weilin Zhang

Yueying Wang

Sheikh Arslan Sehgal

Sami Siraj

Xiaohui Wang

Jun Wang

Yushan Zhu

Quan Chen

Affiliations

Soon will be listed here.

Abstract

Mitophagy is an essential process for mitochondrial quality control and turnover. It is activated by two distinct pathways, one dependent on ubiquitin and the other dependent on receptors including FUNDC1. It is not clear whether these pathways coordinate to mediate mitophagy in response to stresses, or how mitophagy receptors sense stress signals to activate mitophagy. We find that the mitochondrial E3 ligase MARCH5, but not Parkin, plays a role in regulating hypoxia-induced mitophagy by ubiquitylating and degrading FUNDC1. MARCH5 directly interacts with FUNDC1 to mediate its ubiquitylation at lysine 119 for subsequent degradation. Degradation of FUNDC1 by MARCH5 expression desensitizes mitochondria to hypoxia-induced mitophagy, whereas knockdown of endogenous significantly inhibits FUNDC1 degradation and enhances mitochondrial sensitivity toward mitophagy-inducing stresses. Our findings reveal a feedback regulatory mechanism to control the protein levels of a mitochondrial receptor to fine-tune mitochondrial quality.

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