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Related Experiment Videos

Structural rearrangements in soluble mitochondrial ATPase.

B V Chernyak, V Y Chernyak, T B Gladysheva

    Biochimica Et Biophysica Acta
    |May 13, 1981
    PubMed
    Summary

    Cross-linking the enzyme factor F1 with dimethylsuberimidate inactivates it and prevents dissociation, supporting Boyer's theory on ATP synthesis. This cross-linking affects enzyme structure and function.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Factor F1 is a key enzyme in ATP synthesis.
    • Understanding its structural dynamics is crucial for elucidating energy transduction mechanisms.

    Purpose of the Study:

    • To investigate the role of subunit interactions in factor F1 activity and stability.
    • To explore the effects of chemical cross-linking on factor F1's enzymatic properties and conformational changes.

    Main Methods:

    • Chemical cross-linking of factor F1 using dimethylsuberimidate.
    • Enzyme inactivation assays under various conditions (temperature, Mg2+, ADP, ATP, GTP, hydrostatic pressure).
    • Determination of kinetic parameters for ATP binding and release.

    Main Results:

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    • Dimethylsuberimidate treatment cross-linked factor F1 subunits, leading to 60-70% inactivation.
    • Cross-linked factor F1 retained ADP binding but was protected from cold and Mg2+-induced inactivation.
    • Cross-linking prevented slow inactivation during ATP and GTP hydrolysis and confirmed Boyer's hypothesis on ATP synthesis.
    • Hydrostatic pressure accelerated inactivation, indicating hydration changes and subunit dissociation.

    Conclusions:

    • Intersubunit cross-linking in factor F1 impacts its quaternary structure dynamics and enzyme activity.
    • The energy for ATP synthesis is primarily used for product release, not formation, aligning with Boyer's conformational theory.
    • Factor F1's stability and function are intrinsically linked to its subunit interactions and conformational flexibility.