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Related Experiment Videos

Phosphate-dependent Substrate Transport into Mitochondria: Oxidative Studies.

J T Wiskich1

  • 1Department of Botany, University of Adelaide, Adelaide, 5001, South Australia.

Plant Physiology
|July 1, 1975
PubMed
Summary

Inorganic phosphate enhances plant mitochondrial respiration by increasing substrate uptake, not by affecting oxidative phosphorylation. This finding clarifies phosphate's role in mitochondrial function.

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Area of Science:

  • Plant physiology
  • Mitochondrial respiration
  • Biochemistry

Background:

  • Isolated plant mitochondria oxidize malate and citrate.
  • Inorganic phosphate influences mitochondrial respiration.

Purpose of the Study:

  • To investigate the mechanism by which inorganic phosphate stimulates malate and citrate oxidation in plant mitochondria.
  • To determine if phosphate's effect involves oxidative phosphorylation or substrate transport.

Main Methods:

  • Studying isolated plant mitochondria.
  • Assessing respiration rates with and without inorganic phosphate, oligomycin, uncouplers, and adenine nucleotide.
  • Utilizing 2-n-butylmalonate as an inhibitor.
  • Comparing intact and detergent-treated mitochondria.

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Main Results:

  • Inorganic phosphate significantly stimulated malate and citrate oxidation.
  • This stimulation was independent of oligomycin and uncouplers but was inhibited by 2-n-butylmalonate.
  • Phosphate was essential for uncouler-stimulated respiration.
  • Detergent treatment abolished the phosphate requirement and butylmalonate inhibition, indicating intactness of respiratory enzymes.

Conclusions:

  • Phosphate's effect is attributed to enhanced substrate penetration into mitochondria.
  • The observed effects do not involve the oxidative phosphorylation process.
  • Phosphate facilitates substrate transport rather than directly impacting energy transduction.