Structure–Function Insights into Direct Lipid Transfer between Membranes by Mmm1–Mdm12 of ERMES
Open accessAbstract
The endoplasmic reticulum (ER)–mitochondrial encounter structure (ERMES) physically links the membranes of the ER and mitochondria in yeast. Although the ER and mitochondria cooperate to synthesize glycerophospholipids, whether ERMES directly facilitates the lipid exchange between the two organelles remains controversial. Here, we compared the x-ray structures of an ERMES subunit Mdm12 from Kluyveromyces lactis with that of Mdm12 from Saccharomyces cerevisiae and found that both Mdm12 proteins possess a hydrophobic pocket for phospholipid binding. However in vitro lipid transfer assays showed that Mdm12 alone or an Mmm1 (another ERMES subunit) fusion protein exhibited only a weak lipid transfer activity between liposomes. In contrast, Mdm12 in a complex with Mmm1 mediated efficient lipid transfer between liposomes. Mutations in Mmm1 or Mdm12 impaired the lipid transfer activities of the Mdm12–Mmm1 complex and furthermore caused defective phosphatidylserine transport from the ER to mitochondrial membranes via ERMES in vitro. Therefore, the Mmm1–Mdm12 complex functions as a minimal unit that mediates lipid transfer between membranes.
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Mdm12, Mdm34, and Mmm1 have synaptotagmin-like mitochondrial-lipid-binding protein (SMP) domains, and the ERMES complex mediates lipid transport.
“Mdm12, Mdm34, and Mmm1 have synaptotagmin-like mitochondrial-lipid-binding protein (SMP) domains [24], and the ERMES complex mediates lipid transport [25,26].”
From In Candida glabrata, ERMES Component GEM1 Controls Mitochondrial Morphology, mtROS, and Drug Efflux Pump Expression, Resulting in Azole Susceptibility (2023) · cites this paper as [25]
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ER: the Silk Road of interorganellar communication
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- Authors
- Kawano, S., Tamura, Y., Kojima, R., Bala, S., Asai, E., Michel, A. H., Kornmann, B., Riezman, I., Riezman, H., Sakae, Y., Okamoto, Y., & Endo, T.
- Affiliations
- Kyoto Sangyo University (JP)
- Yamagata University (JP)
- Nagoya University (JP)
- ETH Zurich (CH)
- Institute of Biochemistry, ETH Zürich, Zürich, Switzerland 9
- University of Geneva (CH)
- Corresponding author
- Endo, Toshiya
- ORCID
- Venue
- Journal of Cell Biology
- Publisher
- Rockefeller University Press
- Published
- 2017-12-26
- Volume
- 217
- Issue
- 3
- Pages
- 959-974
- ISSN
- 0021-9525 (ISSN-L)
- 1540-8140
- PMC
- PMC5839780
- OpenAlex
- W2777157902
- Cited by
- 148
- References
- 58
- Citations by year
- 2026: 12 · 2025: 11 · 2024: 20 · 2023: 11 · 2022: 14 · 2021: 17 · 2020: 23 · 2019: 26 · 2018: 14
- FWCI
- 8.72
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- The Journal of Cell Biology (publishedVersion, cc-by-nc-sa)
- Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion, cc-by-nc-sa)
- PubMed (publishedVersion)
- Archive ouverte UNIGE (University of Geneva) (publishedVersion, other-oa)
- Archive ouverte UNIGE (University of Geneva) (submittedVersion, cc-by)
- Repository for Publications and Research Data (ETH Zurich) (submittedVersion, cc-by-nc-sa)
- ETH Zürich Research Collection
- Funders
- Japan Society of the Promotion of Science (25840020, 17K18230, 15H05595, 15H05705, 2222703)
- Japan Science and Technology Agency
- Core Research for Evolutional Science and Technology (JPMJCR12M1)
- Swiss National Science Foundation
- National Centre of Competence in Research
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Lipid metabolism and biosynthesis
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Cellular transport and secretion
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
- Keywords
- ERMES, lipid transfer, endoplasmic reticulum-mitochondria contacts, phosphatidylserine transport, glycerophospholipid biosynthesis, Kluyveromyces lactis, Saccharomyces cerevisiae, protein structure, membrane lipid exchange
- MeSH terms
- Biological Transport, Active, Endoplasmic Reticulum, Kluyveromyces, Membrane Proteins, Phospholipids, Saccharomyces cerevisiae, Structure-Activity Relationship, Mitochondrial Proteins, Saccharomyces cerevisiae Proteins, Multiprotein Complexes, Mitochondrial Membranes
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