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The proton inventory technique.

K S Venkatasubban, R L Schowen

    CRC Critical Reviews in Biochemistry
    |January 1, 1984
    PubMed
    Summary
    This summary is machine-generated.

    The proton inventory technique measures enzyme reaction rates using deuterium oxide mixtures. This method identifies exchangeable hydrogen sites and quantifies their isotope effects for enzyme mechanism studies.

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    Area of Science:

    • Biochemistry
    • Enzyme kinetics
    • Isotope effects

    Background:

    • The proton inventory technique is a method used to study enzyme mechanisms.
    • It relies on the kinetic isotope effect observed when varying the ratio of protium oxide (water) to deuterium oxide in reaction mixtures.

    Purpose of the Study:

    • To explain the principles of the proton inventory technique.
    • To demonstrate its application in analyzing enzyme reaction mechanisms.
    • To illustrate how it can reveal information about rate-limiting steps and catalytic sites.

    Main Methods:

    • Enzymic reactions are conducted in buffered solutions with varying atom fractions of deuterium oxide.
    • Reaction rates are measured across this range of deuterium concentrations.
    • Data are analyzed to determine the number and nature of exchangeable protons involved in the rate-determining step.

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    Main Results:

    • The technique successfully identifies and quantifies the contribution of individual exchangeable hydrogen sites to the overall isotope effect.
    • It can distinguish between different catalytic mechanisms and identify rate-limiting steps.
    • Case histories demonstrate its utility in diverse enzyme systems.

    Conclusions:

    • The proton inventory technique is a powerful tool for elucidating enzyme mechanisms.
    • It provides quantitative insights into the role of specific hydrogen atoms in enzymatic catalysis.
    • The method is versatile and applicable to a wide range of enzyme systems.