Cited by 623Mitochondrial Function and PathologyAutophagy in Disease and TherapyATP Synthase and ATPases Research

Mitofusins and OPA1 mediate sequential steps in mitochondrial membrane fusion

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Song, Zhiyin, Ghochani, Mariam, McCaffery, J. Michael, Frey, Terrence G., Chan, David C.·2009·Molecular Biology of the Cell

Abstract

Mitochondrial fusion requires the coordinated fusion of the outer and inner membranes. Three large GTPases--OPA1 and the mitofusins Mfn1 and Mfn2--are essential for the fusion of mammalian mitochondria. OPA1 is mutated in dominant optic atrophy, a neurodegenerative disease of the optic nerve. In yeast, the OPA1 ortholog Mgm1 is required for inner membrane fusion in vitro; nevertheless, yeast lacking Mgm1 show neither outer nor inner membrane fusion in vivo, because of the tight coupling between these two processes. We find that outer membrane fusion can be readily visualized in OPA1-null mouse cells in vivo, but these events do not progress to inner membrane fusion. Similar defects are found in cells lacking prohibitins, which are required for proper OPA1 processing. In contrast, double Mfn-null cells show neither outer nor inner membrane fusion. Mitochondria in OPA1-null cells often contain multiple matrix compartments bounded together by a single outer membrane, consistent with uncoupling of outer versus inner membrane fusion. In addition, unlike mitofusins and yeast Mgm1, OPA1 is not required on adjacent mitochondria to mediate membrane fusion. These results indicate that mammalian mitofusins and OPA1 mediate distinct sequential fusion steps that are readily uncoupled, in contrast to the situation in yeast.

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Authors
Song, Z., Ghochani, M., McCaffery, J. M., Frey, T. G., & Chan, D. C.
Affiliations
  • California Institute of Technology (US)
  • Departments of ‡Physics and
  • Johns Hopkins University (US)
  • San Diego State University (US)
Venue
Molecular Biology of the Cell
Published
2009-08
Volume
20
Issue
15
Pages
3525-3532
ISSN
  • 1059-1524 (ISSN-L)
  • 1939-4586
OpenAlex
W2164886443
Cited by
623
References
38
Citations by year
2026: 32 · 2025: 45 · 2024: 46 · 2023: 39 · 2022: 62 · 2021: 41 · 2020: 41 · 2019: 35 · 2018: 36 · 2017: 36 · 2016: 31 · 2015: 33 · 2014: 33 · 2013: 38 · 2012: 31
FWCI
9.79
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology of the Cell (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion, cc-by-nc-sa)
Funders
  • California Institute of Technology
  • National Institutes of Health
  • National Institute of General Medical Sciences (R01GM062967, GM062967)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
Keywords
mitochondrial fusion, mitofusins, Mfn1, mitofusin 2, OPA1, prohibitin, autosomal dominant optic atrophy, GTPase
MeSH terms
Animals, Cell Fusion, Cells, Cultured, Fibroblasts, Hybrid Cells, Membrane Fusion, Membrane Proteins, Microscopy, Electron, Polyethylene Glycols, Mice, Knockout, Microscopy, Confocal, GTP Phosphohydrolases, Mitochondrial Proteins, Adaptor Proteins, Signal Transducing, Green Fluorescent Proteins, Mitochondrial Membranes, Mice

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