Mitochondrial E3 ligase MARCH5 regulates FUNDC1 to fine‐tune hypoxic mitophagy |
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| 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 |
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| Institution: | 1. State Key Laboratory of Membrane Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China;2. University of Chinese Academy of Sciences, Beijing, China;3. Department of Biosciences, COMSATS Institute of Information Technology, Sahiwal, Pakistan;4. Institute of Basic Medical Sciences, Khyber Medical University, Peshawar, Pakistan;5. Tianjin Key Laboratory of Protein Science, College of Life Sciences, Nankai University, Tianjin, China |
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| 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 MARCH5 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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| Keywords: | MARCH5 mitochondrial autophagy mitophagy receptor ubiquitylation |
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