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Structural basis for regulated assembly of the mitochondrial fission GTPase Drp1

Author

Listed:
  • Kristy Rochon

    (Case Western Reserve University School of Medicine)

  • Brianna L. Bauer

    (Case Western Reserve University School of Medicine)

  • Nathaniel A. Roethler

    (Case Western Reserve University School of Medicine)

  • Yuli Buckley

    (Case Western Reserve University School of Medicine)

  • Chih-Chia Su

    (Case Western Reserve University School of Medicine)

  • Wei Huang

    (Case Western Reserve University School of Medicine)

  • Rajesh Ramachandran

    (Case Western Reserve University School of Medicine
    Case Western Reserve University School of Medicine)

  • Maria S. K. Stoll

    (Case Western Reserve University School of Medicine
    Case Western Reserve University School of Medicine)

  • Edward W. Yu

    (Case Western Reserve University School of Medicine
    Case Western Reserve University School of Medicine)

  • Derek J. Taylor

    (Case Western Reserve University School of Medicine
    Case Western Reserve University School of Medicine)

  • Jason A. Mears

    (Case Western Reserve University School of Medicine
    Case Western Reserve University School of Medicine
    Case Western Reserve University School of Medicine)

Abstract

Mitochondrial fission is a critical cellular event to maintain organelle function. 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. 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 mechanisms that regulate correct spatial and temporal assembly of the fission machinery. Here we present a cryo-EM structure of a full-length Drp1 dimer in an auto-inhibited state. This dimer reveals two key conformational rearrangements that must be unlocked through intramolecular rearrangements to achieve the assembly-competent state observed in previous structures. This structural insight provides understanding into the mechanism for regulated self-assembly of the mitochondrial fission machinery.

Suggested Citation

  • Kristy Rochon & Brianna L. Bauer & Nathaniel A. Roethler & Yuli Buckley & Chih-Chia Su & Wei Huang & Rajesh Ramachandran & Maria S. K. Stoll & Edward W. Yu & Derek J. Taylor & Jason A. Mears, 2024. "Structural basis for regulated assembly of the mitochondrial fission GTPase Drp1," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-45524-4
    DOI: 10.1038/s41467-024-45524-4
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    References listed on IDEAS

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