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Mitochondrial supercomplexes show dynamic changes with exercise. New methods reveal complex subunit interactions and plasticity in skeletal muscle respiration.

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Area of Science:

  • Mitochondrial biology
  • Exercise physiology
  • Proteomics

Background:

  • Mitochondrial respiratory complexes form supercomplexes, crucial for cellular energy production.
  • Previous studies often limited supercomplex analysis to single subunits, hindering a comprehensive understanding.
  • Mitochondrial plasticity and supercomplex dynamics remain incompletely understood, especially in response to physiological stimuli like exercise.

Purpose of the Study:

  • To develop and apply a novel method for comprehensive analysis of the mitochondrial supercomplexome.
  • To investigate the impact of exercise training on mitochondrial supercomplex composition and plasticity in skeletal muscle.
  • To explore the roles of specific proteins, including Lactb and ubiquinone biosynthesis proteins, in exercise-induced mitochondrial adaptations.

Main Methods:

  • Combined native electrophoresis and mass spectrometry to analyze the supercomplexome of mouse skeletal muscle.
  • Quantified 422 mitochondrial proteins across 10 distinct supercomplex bands.
  • Investigated the effects of exercise training and knockdown of specific proteins on mitochondrial respiration.

Main Results:

  • Identified and quantified numerous mitochondrial proteins within defined supercomplex bands, including the debated presence of complexes II and V.
  • Demonstrated non-stoichiometric changes in subunit composition and incorporation into supercomplexes following exercise-induced mitochondrial biogenesis.
  • Revealed exercise-induced alterations in the assembly of supercomplex-related proteins, mtDNA-encoded subunits, Lactb, and ubiquinone biosynthesis proteins.
  • Showed that knockdown of ubiquinone biosynthesis proteins impacts mitochondrial respiration.

Conclusions:

  • The combined native electrophoresis and mass spectrometry approach provides a powerful tool for dissecting mitochondrial supercomplex organization and plasticity.
  • Exercise profoundly influences mitochondrial supercomplex dynamics, leading to complex adaptations beyond simple stoichiometric changes.
  • These findings offer new insights into mitochondrial respiratory function, obesity-associated proteins, and metabolic regulation.