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Related Experiment Video

Updated: Feb 15, 2026

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Endosomal Rab cycles regulate Parkin-mediated mitophagy.

Koji Yamano1,2, Chunxin Wang2, Shireen A Sarraf2

  • 1Ubiquitin Project, Tokyo Metropolitan Institute of Medical Science, Tokyo, Japan.

Elife
|January 24, 2018
PubMed
Summary

Parkin and PINK1 initiate mitophagy by ubiquitinating damaged mitochondria. Endosomal Rab proteins, regulated by RABGEF1, are recruited to assemble ATG9A vesicles for mitochondrial clearance.

Keywords:
ParkinRab7autophagycell biologyhumanmitochondriaubiquitin

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Neuroscience

Background:

  • Mitophagy selectively eliminates damaged mitochondria, a process crucial for cellular health.
  • Parkin and PINK1 are key proteins in mitophagy, mutated in familial Parkinson's disease.
  • The recruitment of ATG9A-vesicles to damaged mitochondria during mitophagy remains poorly understood.

Purpose of the Study:

  • To elucidate the mechanism of ATG9A vesicle recruitment during mitophagy.
  • To identify novel regulators of mitophagy downstream of Parkin.
  • To understand the role of endosomal Rab GTPases in autophagosome formation around mitochondria.

Main Methods:

  • Utilized mammalian cultured cells to study mitophagy.
  • Employed ubiquitin binding assays to track protein recruitment to damaged mitochondria.
  • Investigated the roles of RABGEF1, RAB5, RAB7A, and Rab-GAPs in the mitophagy pathway.
  • Depletion of RAB7A using RNA interference to assess its impact on ATG9A vesicle assembly.

Main Results:

  • RABGEF1 is recruited to damaged mitochondria via ubiquitin binding, downstream of Parkin.
  • RABGEF1 recruits RAB5 and RAB7A to damaged mitochondria, with their association regulated by Rab-GAPs.
  • Depletion of RAB7A impairs ATG9A vesicle assembly and mitochondrial encapsulation by autophagic membranes.
  • Demonstrated a functional link between endosomal Rab cycles and ATG9A vesicle formation in mitophagy.

Conclusions:

  • Endosomal Rab GTPase cascades are crucial for recruiting ATG9A vesicles to damaged mitochondria.
  • RABGEF1 acts as a key mediator, linking Parkin-mediated ubiquitination to the endosomal pathway in mitophagy.
  • This study reveals a novel mechanism regulating autophagosome formation during mitophagy, with implications for Parkinson's disease.