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CHCHD4 links AIF to the biogenesis of respiratory chain complex I

Nazanine Modjtahedi1, Guido Kroemer2

  • 1Equipe 11 labellisée Ligue Nationale contre le Cancer, Center de Recherche des Cordeliers, Paris, France; Institut National de la Santé et de la Recherche Médicale, U1138, Paris, France; Institut Gustave Roussy Cancer Campus, Villejuif, France; Faculty of Medicine, University of Paris Sud, Kremlin-Bicêtre, France.

Molecular & Cellular Oncology
|June 17, 2016
PubMed

Insights

CHCHD4, evolved from yeast Mia40, links apoptosis-inducing factor (AIF) to mitochondrial dysfunction. This protein connects AIF deficiency to impaired respiratory chain complex biogenesis.

Area of Science:

  • Mitochondrial biology
  • Protein evolution
  • Cellular respiration

Background:

  • The Mia40 protein regulates mitochondrial import in yeast.
  • CHCHD4, an evolved form of Mia40, lacks membrane anchorage and interacts with apoptosis-inducing factor (AIF).

Purpose of the Study:

  • To investigate the role of CHCHD4 in mitochondrial function.
  • To elucidate the connection between CHCHD4, AIF, and respiratory chain biogenesis.

Main Methods:

  • Evolutionary analysis of Mia40 and CHCHD4.
  • Protein interaction studies involving CHCHD4 and AIF.
  • Analysis of respiratory chain complex assembly in relation to AIF and CHCHD4.

Main Results:

  • CHCHD4 is the mammalian counterpart of yeast Mia40, lacking membrane anchorage.
  • CHCHD4 interacts with the flavoprotein apoptosis-inducing factor (AIF).
  • CHCHD4 deficiency is linked to impaired biogenesis of respiratory chain complexes.

Conclusions:

  • CHCHD4 acts as a crucial link between AIF and mitochondrial respiratory function.
  • Dysfunctional CHCHD4 contributes to mitochondrial disease by affecting respiratory chain complex assembly.
Keywords:
Disulfide relaymitochondrial importmitochondriopathyrespiratory chain complexes

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