PreprintCited by 52Mitochondrial Function and PathologyATP Synthase and ATPases ResearchAutophagy in Disease and Therapy

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Structural Basis for Regulated Assembly of the Mitochondrial Fission GTPase Drp1

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Preprint — published as 10.1038/s41467-024-45524-4 · Paper page

Abstract

Mitochondrial fission is crucial for distributing cellular energy throughout cells and for isolating damaged regions of the organelle that are targeted for degradation. This multistep process is initiated by the enhanced recruitment and oligomerization of dynamin-related protein 1 (Drp1) at the surface of mitochondria. As such, Drp1 is essential for inducing mitochondrial division in mammalian cells, and homologous proteins are found in all eukaryotes. De novo missense mutations in the Drp1 gene, DNM1L, are associated with severe neurodevelopmental diseases in patients, and no effective treatments are available. As a member of the dynamin superfamily of proteins (DSPs), controlled Drp1 self-assembly into large helical polymers stimulates its GTPase activity to promote membrane constriction. Still, little is known about the regulatory mechanisms that determine when and where Drp1 self-assembles, and proper mitochondrial dynamics requires correct spatial and temporal assembly of the fission machinery. Here we present a cryo-EM structure of a full-length, native Drp1 dimer in an auto-inhibited state. This dimer reveals two key conformational rearrangements that must be unlocked through intermolecular interactions to achieve the assembly competent state previously observed in crystal and filament structures. Specifically, the G domain is closed against the stalk domain and occludes intermolecular interactions necessary for self-assembly beyond a dimer. Similarly, adjacent stalks in the dimer form a more continuous interface that further occludes conserved intermolecular contact sites. This structural insight provides a novel mechanism for regulated self-assembly of the mitochondrial fission machinery.

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Metadata

Authors
Rochon, K., Bauer, B. L., Roethler, N. A., Buckley, Y., Su, C.-C., Huang, W., Ramachandran, R., Stoll, M. S. K., Yu, E. W., Taylor, D. J., & Mears, J. A.
Affiliations
Case Western Reserve University (US)
Corresponding author
Mears, Jason A.
Venue
Nature Communications
Publisher
openRxiv
Published
2023-06-22
Volume
15
Issue
1
Pages
1328-1328
ISSN
2041-1723 (ISSN-L)
OpenAlex
W4391786421
Cited by
52
References
1
Citations by year
2026: 24 · 2025: 22 · 2024: 5 · 2023: 1
FWCI
6.94
Type
journal article
Language
en
Open access
Licence
cc-by
Locations
  • Nature Communications (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • U.S. Department of Health and Human Services (R01 GM125844, U24GM116792, F31 GM139324)
  • Case Western Reserve University
  • National Institutes of Health (1s10od016164-01, AI145069, GM125844)
  • University of California, Los Angeles
  • University of California, San Francisco
  • National Institute of General Medical Sciences (R01GM121583, P41 RR-01081, F31GM139324, T32GM008803, U24GM116792, GM125844, R01GM125844)
  • National Institute of Allergy and Infectious Diseases (R01AI145069)
  • National Center for Research Resources (P41RR001081)
  • Office of Research Infrastructure Programs, National Institutes of Health (S10 OD016164)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › ATP Synthase and ATPases Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Autophagy in Disease and Therapy
Keywords
Drp1, mitochondrial fission, dynamin-related proteins, dynamin superfamily, GTPase activity, protein self-assembly, conformational change, mitochondrial division, membrane constriction
MeSH terms
Animals, Mammals, Microtubule-Associated Proteins, Mitochondria, GTP Phosphohydrolases, Mitochondrial Proteins, Dynamins, Mitochondrial Dynamics

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