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Assessment of Mitochondrial Fission/Fusion Dynamics in Kidney Proximal Tubular Cells
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The small GTPase Arf1 modulates mitochondrial morphology and function.

Karin B Ackema1, Jürgen Hench2, Stefan Böckler3

  • 1Growth and Development, Biozentrum University of Basel, Basel, Switzerland.

The EMBO Journal
|September 6, 2014
PubMed
Summary

The small GTPase Arf1 and GBF1 are crucial for mitochondrial health, impacting morphology and activity across species. This function is linked to ER-mitochondrial contacts, independent of Arf1

Keywords:
Cdc48ER–mitochondrial contact sitesmitochondria‐associated degradationmitophagystress response

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Mitochondrial Biology

Background:

  • The small GTPase Arf1 is known for its role in membrane traffic and protein coat recruitment.
  • Its involvement in other cellular processes beyond vesicular transport remains largely unexplored.

Purpose of the Study:

  • To investigate the potential role of Arf1 and its associated guanine nucleotide exchange factor (GBF1) in mitochondrial function.
  • To determine if Arf1's mitochondrial role is conserved across different species and linked to specific cellular structures.

Main Methods:

  • Utilized loss-of-function mutants in *Caenorhabditis elegans* and *Saccharomyces cerevisiae* to assess mitochondrial morphology and activity.
  • Performed co-fractionation studies to examine the localization of yeast Arf1.
  • Investigated genetic interactions between Arf1 and components of ER-mitochondrial contact sites.

Main Results:

  • Loss of Arf1 or GBF1 function led to impaired mitochondrial morphology and activity in *C. elegans*, mammalian cells, and yeast.
  • In yeast, Arf1 mutants showed accumulation of the mitofusin Fzo1, which was rescued by Cdc48 overexpression.
  • Yeast Arf1 was found to co-fractionate with ER and mitochondrial membranes and genetically interact with Gem1, a contact site component.

Conclusions:

  • Arf1 and GBF1 play a conserved, unexpected role in maintaining mitochondrial homeostasis and dynamics.
  • This mitochondrial function of Arf1 is associated with ER-mitochondrial contacts and is independent of its canonical role in vesicular traffic.