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F1-ATPase from different submitochondrial particles.

A Bruni, A Pitotti, P Palatini

    Biochimica Et Biophysica Acta
    |March 15, 1979
    PubMed
    Summary
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    Mitochondrial F1-adenosine triphosphatase (ATPase) activity depends on the original complex. Rapid, non-denaturing isolation procedures ensure isolated F1-adenosine triphosphatase (ATPase) reflects these properties.

    Area of Science:

    • Biochemistry
    • Mitochondrial Physiology
    • Enzyme Kinetics

    Background:

    • Mitochondrial F1-adenosine triphosphatase (ATPase) is a key enzyme complex involved in cellular energy production.
    • Variations in F1-adenosine triphosphatase (ATPase) activity, cold stability, inhibitor content, and magnesium levels have been observed in different mitochondrial preparations.
    • Understanding the factors influencing F1-adenosine triphosphatase (ATPase) activity is crucial for comprehending mitochondrial function.

    Purpose of the Study:

    • To investigate the relationship between the properties of isolated F1-adenosine triphosphatase (ATPase) and the original mitochondrial ATPase complexes.
    • To determine if the isolation method affects the observed ATPase activity.
    • To explore the role of ATPase inhibitor and magnesium content in F1-adenosine triphosphatase (ATPase) activity.

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    Main Methods:

    • Extraction of F1-adenosine triphosphatase (ATPase) using the diphosphatidylglycerol procedure.
    • Isolation of F1-adenosine triphosphatase (ATPase) from submitochondrial particles prepared under different conditions (ammonia pH 9.2 vs. neutral pH with magnesium and ATP).
    • Comparison of isolated F1-adenosine triphosphatase (ATPase) activity with established enzyme purification procedures and factors.

    Main Results:

    • The ATPase activity of isolated F1-adenosine triphosphatase (ATPase) was directly dependent on the activity of the original mitochondrial particles.
    • F1-adenosine triphosphatase (ATPase) extracted under alkaline conditions (pH 9.2) showed activity comparable to conventionally purified enzymes.
    • F1-adenosine triphosphatase (ATPase) extracted under neutral conditions with magnesium and ATP resembled Factor A, indicating distinct properties based on isolation conditions.
    • No direct correlation was found between ATPase inhibitor content and ATPase activity in isolated preparations; however, inhibitor-enzyme association efficiency within the membrane was related to activity.

    Conclusions:

    • The ATPase activity of isolated F1-adenosine triphosphatase (ATPase) accurately reflects the properties of the original mitochondrial complex when rapid and non-denaturing isolation techniques are employed.
    • Isolation conditions significantly influence the measured properties of F1-adenosine triphosphatase (ATPase), highlighting the importance of methodology.
    • The efficiency of ATPase inhibitor interaction within the membrane is a critical factor influencing enzyme activity, independent of inhibitor concentration alone.