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Cell Type-Specific Modulation of Respiratory Chain Supercomplex Organization.

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|June 25, 2016
PubMed
Summary

The study identifies a conserved respiratory supercomplex (I+III+IV) in human and mouse cells, crucial for energy production. Impairment of this supercomplex, linked to a specific mutation, causes Leigh's disease by reducing cellular respiration.

Keywords:
Leigh’s diseasemitochondrial dysfunctionmitochondrial supercomplexnuclear genetic backgroundrespiratory chain

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Area of Science:

  • Biochemistry
  • Mitochondrial Biology
  • Cellular Respiration

Background:

  • Respiratory chain complexes form supercomplexes, with supercomplex I+III+IV uniquely transferring electrons from NADH to oxygen.
  • Previous studies suggested mouse supercomplex I+III+IV formation is highly genetic-dependent.

Purpose of the Study:

  • To investigate the conservation and assembly of respiratory supercomplex I+III+IV in various cell lines.
  • To identify the minimal components of supercomplex I+III+IV and their role in disease.

Main Methods:

  • Blue native polyacrylamide gel electrophoresis (BN-PAGE) to analyze respiratory supercomplexes.
  • Analysis of patient-derived cells with mitochondrial DNA mutations.

Main Results:

  • Supercomplex I+III+IV composition is conserved across diverse mouse and human cell lines.
  • A minimal supercomplex I+III, termed the lowest supercomplex (LSC), was identified and associated with Complex IV to form I+III+IV in some cells.
  • A mutation in mitochondrial NADH dehydrogenase 1 (ND1) impaired LSC-containing supercomplex I+III+IV assembly, decreasing cellular respiration and ATP generation in a Leigh's disease patient.

Conclusions:

  • The existence of a conserved LSC I+III+IV supercomplex is demonstrated.
  • Impairment of the LSC I+III+IV supercomplex leads to decreased cellular respiration and is implicated in Leigh's disease pathogenesis.