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MARCH5-mediated quality control on acetylated Mfn1 facilitates mitochondrial homeostasis and cell survival

Y-Y Park1, O T K Nguyen2, H Kang3

  • 1Department of Biochemistry, Ajou University School of Medicine, Suwon, Korea.

Cell Death & Disease
|April 12, 2014
PubMed

Insights

Mitochondrial ubiquitin ligase MARCH5 controls acetylated Mfn1 levels, crucial for cell survival. This MARCH5-dependent quality control maintains Mfn1 balance, protecting cells from stress-induced death.

Area of Science:

  • Cell Biology
  • Mitochondrial Biology
  • Molecular Mechanisms

Background:

  • Mitochondrial dynamics and quality control are vital for cellular integrity.
  • Mitochondrial ubiquitin ligase membrane-associated RING-CH (MARCH5) is a key regulator of mitochondrial dynamics.

Purpose of the Study:

  • To investigate the role of MARCH5 in mitochondrial adaptation to stress.
  • To elucidate the mechanism by which MARCH5 regulates Mfn1 levels and its impact on cell survival.

Main Methods:

  • Analysis of Mfn1 levels and acetylation under mitochondrial stress.
  • Investigation of MARCH5-Mfn1 interaction and ubiquitylation.
  • Assessment of cell viability in MARCH5-knockout and mutant cells under stress.

Main Results:

  • Mitochondrial stress elevates Mfn1 levels, and Mfn1 depletion or overexpression leads to cell death.
  • MARCH5 binds and ubiquitylates acetylated Mfn1, with increased activity under stress.
  • Acetylation-deficient Mfn1 mutants show reduced MARCH5 interaction and ubiquitylation.
  • Loss of MARCH5 function results in rapid cell death upon mitochondrial stress.

Conclusions:

  • MARCH5-mediated quality control of acetylated Mfn1 is essential for maintaining Mfn1 homeostasis.
  • This fine-tuning of Mfn1 levels by MARCH5 is critical for cellular survival under mitochondrial stress.

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