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    Parkin promotes cell survival by removing damaged mitochondria via mitophagy. However, although some studies have suggested that Parkin induces cell death, the regulatory mechanism underlying the dual role of Parkin remains unknown. Herein, we report that mitochondrial ubiquitin ligase (MITOL/MARCH5) regulates Parkin-mediated cell death through the FKBP38-dependent dynamic translocation from the mitochondria to the ER during mitophagy. Mechanistically, MITOL mediates ubiquitination of Parkin at lysine 220 residue, which promotes its proteasomal degradation, and thereby fine-tunes mitophagy by controlling the quantity of Parkin. Deletion of MITOL leads to accumulation of the phosphorylated active form of Parkin in the ER, resulting in FKBP38 degradation and enhanced cell death. Thus, we have shown that MITOL blocks Parkin-induced cell death, at least partially, by protecting FKBP38 from Parkin. Our findings unveil the regulation of the dual function of Parkin and provide a novel perspective on the pathogenesis of PD. © 2021 The Authors. Published under the terms of the CC BY NC ND 4.0 license.

    Citation

    Isshin Shiiba, Keisuke Takeda, Shun Nagashima, Naoki Ito, Takeshi Tokuyama, Shun-Ichi Yamashita, Tomotake Kanki, Toru Komatsu, Yasuteru Urano, Yuuta Fujikawa, Ryoko Inatome, Shigeru Yanagi. MITOL promotes cell survival by degrading Parkin during mitophagy. EMBO reports. 2021 Feb 10;22(3):e49097


    PMID: 33565245

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