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Competition between extramitochondrial and intramitochondrial ATP-consuming processes.

G Letko, U Küster

    Acta Biologica Et Medica Germanica
    |January 1, 1979
    PubMed
    Summary

    Mitochondria use adenosine triphosphate (ATP) for both internal and external processes. A common internal pool supplies ATP for these competing demands, impacting energy production efficiency.

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    Area of Science:

    • Biochemistry
    • Cellular Respiration
    • Mitochondrial Physiology

    Background:

    • Mitochondria are central to cellular energy production through oxidative phosphorylation.
    • ATP utilization occurs both inside and outside the mitochondria, but the coordination is not fully understood.
    • Dietary factors, such as high protein intake, can influence mitochondrial function.

    Purpose of the Study:

    • To investigate the relationship between intra- and extramitochondrial ATP utilization in rat liver mitochondria.
    • To determine how different feeding conditions (normal, starved, high-protein) affect this relationship.
    • To elucidate the source of ATP for key intramitochondrial and extramitochondrial processes.

    Main Methods:

    • Isolated rat liver mitochondria from normally fed, starved, and high-protein fed rats were used.
    • ATP export was induced using a hexokinase-glucose system.
    • Intramitochondrial ATP consumption was stimulated by measuring citrulline synthesis (requiring ammonia, bicarbonate, and ornithine).

    Main Results:

    • Both ATP export and citrulline synthesis compete for ATP generated by oxidative phosphorylation.
    • Citrulline synthesis rate decreased as the extramitochondrial ATP/ADP ratio lowered.
    • High-protein diet significantly increased oxidative phosphorylation rates and reduced the intramitochondrial ATP/ADP ratio.

    Conclusions:

    • ATP for adenine nucleotide translocation and carbamoyl phosphate synthesis originates from a shared intramitochondrial adenine nucleotide pool.
    • The intramitochondrial ATP/ADP ratio is not in thermodynamic equilibrium with the extramitochondrial ratio.
    • Dietary protein influences mitochondrial ATP handling and energy production capacity.

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