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Viscosity-dependent structural fluctuations in enzyme catalysis.

B Gavish, M M Werber

    Biochemistry
    |April 3, 1979
    PubMed
    Summary
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    Viscosity significantly impacts carboxypeptidase A catalysis rates. Adjusting for viscosity and dielectric constant reveals the energy barrier is lower than observed activation energy, suggesting viscosity-dependent structural fluctuations are key.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Physical Chemistry

    Background:

    • Carboxypeptidase A is a key enzyme in protein metabolism.
    • Enzyme catalysis rates are influenced by solvent properties.
    • Understanding these influences is crucial for enzyme mechanism elucidation.

    Purpose of the Study:

    • To investigate the effect of viscosity on carboxypeptidase A catalysis.
    • To determine the contribution of viscosity to the catalytic rate constant (kcat).
    • To explore the role of solvent dielectric constant in enzyme kinetics.

    Main Methods:

    • Enzyme kinetics studies using carboxypeptidase A.
    • Substrate: tripeptide carbobenzoxy-l-alanyl-l-alanyl-l-alanine [Z(L-Ala)3].
    • Varying solvent compositions (aqueous methanol and glycerol) to alter viscosity and dielectric constant.

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    Main Results:

    • Viscosity significantly affects the hydrolysis rate of Z(L-Ala)3 by carboxypeptidase A.
    • Most of the observed rate changes in varying solvent compositions are attributable to viscosity.
    • Correcting for viscosity and dielectric constant minimized differences in Arrhenius plots.

    Conclusions:

    • Viscosity influences the rate-limiting step of carboxypeptidase A catalysis.
    • The enzyme-substrate complex overcomes the energy barrier via viscosity-dependent structural fluctuations.
    • Kinetic measurements provide insights into the structural flexibility of enzyme-substrate complexes.