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Related Experiment Videos

Top-down control analysis of temperature effect on oxidative phosphorylation

S Dufour1, N Rousse, P Canioni

  • 1Résonance Magnétique des Systèmes Biologiques, Bordeaux, France.

The Biochemical Journal
|March 15, 1996
PubMed
Summary

Temperature significantly impacts mitochondrial function, affecting respiration and ATP production. Lower temperatures reduce efficiency, but do not cause uncoupling, with specific control patterns emerging at 4°C.

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Area of Science:

  • Mitochondrial physiology
  • Bioenergetics
  • Biophysics

Background:

  • Temperature is a critical factor influencing cellular processes.
  • Mitochondrial function, including oxidative phosphorylation, is sensitive to thermal changes.
  • Understanding these effects is crucial for interpreting cellular energy metabolism under varying conditions.

Purpose of the Study:

  • To investigate the impact of temperature on the control mechanisms of oxidative phosphorylation in isolated rat liver mitochondria.
  • To analyze the effects of temperature on respiration rate, phosphorylation rate, proton leakage, protonmotive force, and ATP/O ratio.
  • To elucidate the role of proton leakage and substrate oxidation in temperature-dependent mitochondrial control.

Main Methods:

  • Utilized top-down elasticity and control analyses on isolated rat liver mitochondria.

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  • Performed simultaneous measurements of membrane potential, oxidation, and phosphorylation rates across various ATP turnover rates (state 4 to state 3).
  • Examined mitochondrial function across a temperature range from 4°C to 37°C.

    • Main Results:

    • Mitochondrial activities decreased significantly with temperature, but the effective ATP/O ratio peaked at 25°C.
    • Proton leakage decreased at 4°C, ruling out uncoupling as a cause of reduced efficiency.
    • Control patterns shifted at 4°C, with increased control by phosphorylation and substrate oxidation subsystems.
    • Passive membrane permeability to protons was not implicated in temperature-dependent control changes.

    Conclusions:

    • Temperature affects mitochondrial control mechanisms, altering the balance between respiration, phosphorylation, and proton leak.
    • Reduced ATP/O ratio at low temperatures is primarily due to decreased phosphorylation efficiency, not uncoupling.
    • Specific control distributions at low temperatures highlight the complex interplay of mitochondrial subsystems under thermal stress.