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Updated: Mar 7, 2026

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The Mitochondrial Rhomboid Protease PARL Is Regulated by PDK2 to Integrate Mitochondrial Quality Control and

Guang Shi1, G Angus McQuibban1

  • 1Department of Biochemistry, University of Toronto, 1 King's College Circle, Toronto, ON M5S 1A8, Canada.

Cell Reports
|February 9, 2017
PubMed

Insights

Mitochondrial stress triggers PARL protease cleavage, regulating mitophagy. PDK2 enzyme links mitochondrial energy defects to mitophagy, impacting cellular health and diseases like Parkinson's.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Mitochondrial quality control (MQC) maintains cellular health.
  • Dysfunctional MQC is implicated in diseases, including Parkinson's disease.
  • PARL protease regulates mitophagy, a key MQC process.

Purpose of the Study:

  • To investigate the regulation of PARL protease activity by mitochondrial stress.
  • To elucidate the role of PDK2 in the PARL-mediated mitophagy pathway.
  • To understand how mitochondrial metabolism integrates with MQC.

Main Methods:

  • Analysis of PARL autocleavage (β cleavage) under varying mitochondrial ATP levels.
  • Phosphorylation assays to determine PDK2's effect on PARL.
  • Assessment of PINK1/PARKIN-mediated mitophagy in response to PDK2 and PARL modulation.

Main Results:

  • PARL β cleavage is induced by mitochondrial ATP depletion (stress).
  • PDK2 phosphorylates PARL, promoting β cleavage and generating a less active PACT form.
  • PDK2 negatively regulates PINK1/PARKIN-mediated mitophagy via PARL.

Conclusions:

  • PDK2 and PARL act as a signaling axis connecting mitochondrial energy status to mitophagy.
  • This pathway integrates mitochondrial metabolism with MQC.
  • Dysregulation of this axis may contribute to diseases associated with mitochondrial dysfunction.
Keywords:
intramembrane proteolysismetabolismmitochondrial biogenesismitophagyrhomboid protease

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