MITOL Regulates Endoplasmic Reticulum-Mitochondria Contacts via Mitofusin2
Open accessAbstract
The mitochondrial ubiquitin ligase MITOL regulates mitochondrial dynamics. We report here that MITOL regulates mitochondria-associated endoplasmic reticulum (ER) membrane (MAM) domain formation through mitofusin2 (Mfn2). MITOL interacts with and ubiquitinates mitochondrial Mfn2, but not ER-associated Mfn2. Mutation analysis identified a specific interaction between MITOL C-terminal domain and Mfn2 HR1 domain. MITOL mediated lysine-63-linked polyubiquitin chain addition to Mfn2, but not its proteasomal degradation. MITOL knockdown inhibited Mfn2 complex formation and caused Mfn2 mislocalization and MAM dysfunction. Sucrose-density gradient centrifugation and blue native PAGE retardation assay demonstrated that MITOL is required for GTP-dependent Mfn2 oligomerization. MITOL knockdown reduced Mfn2 GTP binding, resulting in reduced GTP hydrolysis. We identified K192 in the GTPase domain of Mfn2 as a major ubiquitination site for MITOL. A K192R mutation blocked oligomerization even in the presence of GTP. Taken together, these results suggested that MITOL regulates ER tethering to mitochondria by activating Mfn2 via K192 ubiquitination.
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Formation of a Lys63-polyubiquitin chain by the E3 ligase MARCHV/MITOL does not induce MFN2 degradation but increases its activity and MAM formation and function.
“Conversely, the formation of a Lys63–polyubiquitin chain by the E3 ligase MARCHV/MITOLl does not induce MFN2 degradation but increases its activity and MAM formation and function [71].”
From The connection between the dynamic remodeling of the mitochondrial network and the regulation of muscle mass (2021) · cites this paper as [71]
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- Authors
- Sugiura, A., Nagashima, S., Tokuyama, T., Amo, T., Matsuki, Y., Ishido, S., Kudo, Y., McBride, H. M., Fukuda, T., Matsushita, N., Inatome, R., & Yanagi, S.
- Affiliations
- Tokyo University of Pharmacy and Life Sciences (JP)
- National Defense Academy of Japan (JP)
- RIKEN (JP)
- Tokyo Medical University Hachioji Medical Center (JP)
- Montreal Neurological Institute and Hospital (CA)
- Corresponding author
- Yanagi, Shigeru
- ORCID
- Venue
- Molecular Cell
- Publisher
- Elsevier BV
- Published
- 2013-07
- Volume
- 51
- Issue
- 1
- Pages
- 20-34
- ISSN
- 1097-2765 (ISSN-L)
- OpenAlex
- W2022458507
- Cited by
- 303
- References
- 35
- Citations by year
- 2026: 13 · 2025: 22 · 2024: 11 · 2023: 26 · 2022: 24 · 2021: 31 · 2020: 34 · 2019: 23 · 2018: 19 · 2017: 30 · 2016: 30 · 2015: 17 · 2014: 15 · 2013: 7
- FWCI
- 10.29
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Molecular Cell (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science
- Ministry of Education, Culture, Sports, Science and Technology
- Naito Foundation
- Sumitomo Foundation
- 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 › Cell Biology › Cellular transport and secretion
- Keywords
- MAM domain, ER-mitochondria contact sites, ubiquitination, mitochondrial dynamics, GTPase activity, protein complex formation, protein mislocalization
- MeSH terms
- Animals, Endoplasmic Reticulum, HeLa Cells, Humans, Membrane Proteins, Mitochondria, GTP Phosphohydrolases, Mitochondrial Proteins, Ubiquitin-Protein Ligases, Mice, Ubiquitination
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