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Related Experiment Videos

On the interpretation of quantitative structure-function activity relationship data for lactate oxidase.

K Yorita1, H Misaki, B A Palfey

  • 1Institute for Enzyme Research, University of Tokushima, Kuramoto-cho 3-18-15, Tokushima 770-8503, Japan.

Proceedings of the National Academy of Sciences of the United States of America
|March 8, 2000
PubMed
Summary

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Researchers modified lactate oxidase by replacing its native flavin (FMN) with derivatives. Enzyme activity correlated with flavin redox potential, revealing insights into reaction mechanisms and substrate binding.

Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Bioorganic chemistry

Background:

  • L-lactate oxidase is a flavoenzyme that catalyzes the oxidation of L-lactate.
  • The enzyme's native flavin, flavin mononucleotide (FMN), was removed and replaced with synthetic derivatives to probe structure-activity relationships.

Purpose of the Study:

  • To investigate the role of flavin redox potential in the catalytic activity of L-lactate oxidase.
  • To elucidate the reaction mechanism of L-lactate oxidase using reconstituted enzymes with modified flavins.

Main Methods:

  • Reconstitution of Aerococcus viridans L-lactate oxidase apoprotein with 12 FMN derivatives.
  • Measurement of redox potentials of free and enzyme-bound flavins.
  • Kinetic studies of reconstituted enzymes with L-lactate and L-mandelate.

Related Experiment Videos

  • Analysis of flavin N5-sulfite adduct formation and reaction with molecular oxygen.

    • Main Results:

    • Linear correlations were observed between Hammett parameters, flavin redox potentials, and enzyme kinetics.
    • Enzyme reduction rate constants increased with redox potential, reaching a plateau for L-lactate.
    • Breakpoints in kinetic plots suggest a rate-limiting equilibrium step in substrate/ligand binding.

    Conclusions:

    • The study reveals a two-step equilibrium preceding the chemical reaction, limiting the overall rate.
    • Transition states involve significant negative charge development, consistent with hydride transfer or carbanion mechanisms.
    • Isotope and viscosity effects support the proposed reaction mechanisms.