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Interaction between citrate synthase and thiolase.

B Sumegi, H F Gilbert, P A Srere

    The Journal of Biological Chemistry
    |January 10, 1985
    PubMed
    Summary
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    Mitochondrial enzymes thiolase and citrate synthase interact, suggesting a coordinated role in fatty acid metabolism. This interaction was confirmed using multiple biochemical assays, highlighting specific enzyme partnerships within the cell.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cellular Metabolism

    Background:

    • Mitochondria are central to cellular energy production, utilizing fatty acids via enzymes like thiolase.
    • Citrate synthase is crucial for the citric acid cycle, utilizing acetyl-CoA (CoASAc).
    • Understanding enzyme interactions within mitochondria is key to deciphering metabolic pathways.

    Purpose of the Study:

    • To investigate the potential interaction between thiolase and citrate synthase.
    • To determine if these two key mitochondrial matrix enzymes physically associate.
    • To explore the functional implications of such an interaction in fatty acid metabolism.

    Main Methods:

    • Polyethylene glycol-mediated co-precipitation assays to detect enzyme complex formation.

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  • Fluorescence anisotropy measurements using labeled citrate synthase to monitor binding.
  • Gel permeation chromatography for assessing co-elution and complex size.

    • Main Results:

    • Thiolase and citrate synthase were shown to co-precipitate, indicating a physical interaction.
    • Thiolase binding induced a detectable change in citrate synthase's fluorescence anisotropy.
    • The enzymes co-eluted during gel filtration, further supporting their association.
    • Specificity of the interaction was confirmed against unrelated enzymes.

    Conclusions:

    • Thiolase and citrate synthase form a specific complex within the mitochondrial matrix.
    • This interaction suggests a coordinated functional relationship between fatty acid breakdown and the citric acid cycle.
    • The findings provide new insights into the regulation of mitochondrial metabolism.