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Regulation of mitochondrial morphology by USP30, a deubiquitinating enzyme present in the mitochondrial outer

Nobuhiro Nakamura1, Shigehisa Hirose

  • 1Department of Biological Sciences, Tokyo Institute of Technology, Yokohama 226-8501, Japan. nnakamur@bio.titech.ac.jp

Molecular Biology of the Cell
|February 22, 2008
PubMed

Insights

Human ubiquitin-specific protease 30 (USP30) deubiquitinating enzyme maintains mitochondrial morphology. Depleting USP30 causes abnormal mitochondrial shape, highlighting deubiquitination

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Ubiquitination of mitochondrial proteins is implicated in regulating mitochondrial dynamics in mammalian cells.
  • The role of deubiquitination in mitochondrial dynamics remains largely uncharacterized.

Purpose of the Study:

  • To identify deubiquitinating enzymes involved in mitochondrial dynamics.
  • To investigate the function of human ubiquitin-specific protease 30 (USP30) in maintaining mitochondrial morphology.

Main Methods:

  • RNA interference (RNAi) was used to deplete USP30 expression in mammalian cells.
  • Mitochondrial morphology was assessed using microscopy.
  • Ectopic expression of USP30 was performed to rescue the observed phenotype.

Main Results:

  • Depletion of USP30 resulted in elongated and interconnected mitochondria, indicating altered mitochondrial dynamics.
  • The observed phenotype was dependent on the activity of mitochondrial fusion factors (mitofusins).
  • Ectopic expression of USP30, dependent on its enzymatic activity, rescued the abnormal mitochondrial morphology.

Conclusions:

  • Human USP30 is a deubiquitinating enzyme located on the mitochondrial outer membrane.
  • USP30 plays a crucial role in maintaining normal mitochondrial morphology.
  • This study provides new insights into the cellular function of deubiquitination in regulating mitochondrial dynamics.

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