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Mitochondrial outer-membrane protein FUNDC1 mediates hypoxia-induced mitophagy in mammalian cells

Lei Liu1, Du Feng, Guo Chen

  • 1The State Key Laboratory of Biomembrane and Membrane Biotechnology, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.

Nature Cell Biology
|January 24, 2012
PubMed

Insights

Mitochondria quality is maintained by mitophagy. Researchers identified FUNDC1 as a key protein regulating hypoxia-induced mitophagy by interacting with LC3, offering insights into neurodegenerative and metabolic diseases.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Dysfunctional mitochondria are removed via mitophagy, a crucial cellular process.
  • Dysregulation of mitophagy is linked to neurodegenerative and metabolic disorders.
  • Mechanisms of mitochondrial recognition and regulation in mitophagy are not fully understood.

Purpose of the Study:

  • To identify the receptor responsible for recognizing mitochondria during hypoxia-induced mitophagy.
  • To elucidate the regulatory mechanisms governing hypoxia-induced mitophagy.

Main Methods:

  • Investigated the role of FUNDC1 in mitophagy using knockdown and mutation experiments.
  • Analyzed the interaction between FUNDC1 and LC3 using a canonical LC3-binding motif.
  • Studied the effect of hypoxia on FUNDC1 phosphorylation and its interaction with LC3.

Main Results:

  • FUNDC1, an outer mitochondrial membrane protein, acts as a receptor for hypoxia-induced mitophagy.
  • FUNDC1 interacts with LC3 via its Y(18)xxL(21) motif, essential for mitophagy induction.
  • Hypoxia induces FUNDC1 dephosphorylation, enhancing its LC3 interaction and promoting selective mitophagy.

Conclusions:

  • FUNDC1 is a critical receptor mediating selective mitophagy in response to hypoxia.
  • This study provides novel insights into mitochondrial quality control pathways.
  • Understanding FUNDC1's role may offer therapeutic targets for diseases linked to mitophagy dysfunction.

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