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Temperature-dependent conformational changes in isolated oligomycin-sensitive ATPase.

G Curatola, R M Fiorini, G Solaini

    FEBS Letters
    |May 2, 1983
    PubMed
    Summary
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    Oligomycin-sensitive ATPase shows a kinetic shift around 20-25°C, impacting its ATP binding and energy use. Structural changes, measured by circular dichroism, correlate with this temperature-dependent enzymatic activity.

    Area of Science:

    • Biochemistry
    • Enzyme kinetics
    • Structural biology

    Background:

    • Oligomycin-sensitive ATPase is a crucial enzyme involved in cellular energy metabolism.
    • Understanding its kinetic and structural properties is vital for comprehending energy transduction mechanisms.

    Purpose of the Study:

    • To investigate the temperature-dependent kinetic and structural alterations of isolated oligomycin-sensitive ATPase.
    • To correlate observed kinetic changes with specific structural modifications.

    Main Methods:

    • Enzyme kinetics assays were performed to determine kinetic parameters like Km and activation energy.
    • Circular dichroism spectroscopy in the UV region was used to detect temperature-induced structural changes, specifically alpha-helix content.

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    Main Results:

    • A distinct kinetic transition was observed in oligomycin-sensitive ATPase activity around 20-25°C.
    • Below this temperature range, the enzyme exhibited higher activation energy and a lower Michaelis constant (Km) for ATP.
    • Circular dichroism data revealed temperature-dependent structural changes, with increased negative ellipticities in the 208-225 nm region (indicating higher alpha-helix content) above 25°C.

    Conclusions:

    • The study demonstrates a clear correlation between temperature-induced structural changes and altered kinetic behavior in oligomycin-sensitive ATPase.
    • These findings suggest that conformational flexibility plays a significant role in the enzyme's catalytic efficiency and substrate binding across different temperatures.