Journal
JOURNAL OF CELL SCIENCE
Volume 126, Issue 1, Pages 176-185Publisher
COMPANY BIOLOGISTS LTD
DOI: 10.1242/jcs.111211
Keywords
Mitochondria; Membrane fission; Fis1; Dynamin-related protein; Drp1
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Funding
- Ministry of Education, Culture, Sports, Science and Technology, Japan [22020010, 22020026, JPS14002007]
- Funding Program for Next Generation World-Leading Researchers
- Ono Medical Research Foundation
- Kato Memorial Bioscience Foundation
- Takeda Science Foundation
- Grants-in-Aid for Scientific Research [23770216, 24770133] Funding Source: KAKEN
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In yeast, C-tail-anchored mitochondrial outer membrane protein Fis1 recruits the mitochondrial-fission-regulating GTPase Dnm1 to mitochondrial fission sites. However, the function of its mammalian homologue remains enigmatic because it has been reported to be dispensable for the mitochondrial recruitment of Drp1, a mammalian homologue of Dnm1. We identified TBC1D15 as a Fis1-binding protein in HeLa cell extracts. Immunoprecipitation revealed that Fis1 efficiently interacts with TBC1D15 but not with Drp1. Bacterially expressed Fis1 and TBC1D15 formed a direct and stable complex. Exogenously expressed TBC1D15 localized mainly in cytoplasm in HeLa cells, but when coexpressed with Fis1 it localized to mitochondria. Knockdown of TBC1D15 induced highly developed mitochondrial network structures similar to the effect of Fis1 knockdown, suggesting that the TBC1D15 and Fis1 are associated with the regulation of mitochondrial morphology independently of Drp1. These data suggest that Fis1 acts as a mitochondrial receptor in the recruitment of mitochondrial morphology protein in mammalian cells.
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