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Related Experiment Videos

Oxidation-reduction potential measurements on chloroperoxidase and its complexes

R Makino, R Chiang, L P Hager

    Biochemistry
    |October 19, 1976
    PubMed
    Summary

    Chloroperoxidase, an enzyme catalyzing halogenation, exhibits pH-dependent oxidation-reduction potential changes near pH 4.7, suggesting a reversible modification. Its potential varies significantly with pH, impacting its enzymatic activity.

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    Area of Science:

    • Biochemistry
    • Enzymology
    • Bioinorganic Chemistry

    Background:

    • Chloroperoxidase (CPO) catalyzes peroxidative chlorination, bromination, and iodination.
    • CPO shares characteristics with P-450 hemoproteins, including CO complex Soret absorption.
    • Understanding CPO's redox properties is crucial for its biological function.

    Purpose of the Study:

    • Investigate the oxidation-reduction potential of chloroperoxidase.
    • Determine the influence of pH on CPO's redox potential and CO binding.
    • Elucidate the interaction of halide ions with CPO.

    Main Methods:

    • Oxidation-reduction potential measurements across a pH range.
    • Spectroscopic and potentiometric titrations to assess CO binding affinity.

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  • Analysis of CPO's behavior in the presence of chloride, bromide, and iodide.

    • Main Results:

    • A discontinuity in oxidation-reduction potential and CO binding affinity was observed around pH 4.7.
    • The oxidation-reduction potential of CPO shifts from -140 mV at pH 6.9 to +150 mV at pH 2.7.
    • Halide complexes showed redox potentials similar to the native enzyme, indicating non-axial ligand binding.

    Conclusions:

    • Ferrous chloroperoxidase undergoes a reversible modification at low pH, affecting its oxidation-reduction potential.
    • The observed pH-dependent changes are critical for CPO's catalytic activity.
    • Halide anions likely bind to CPO without acting as axial ligands to the heme iron.