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The redox properties of ascorbate peroxidase.

Igor Efimov1, Nektaria D Papadopoulou, Kirsty J McLean

  • 1Department of Chemistry, University of Leicester, University Road, Leicester, LE1 7RH, United Kingdom.

Biochemistry
|June 22, 2007
PubMed
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Ascorbate peroxidase (APX) redox potentials were measured for wild type and variants. These findings explain APX catalytic activity and intermediate instability, offering a framework for related enzyme studies.

Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Redox enzymology

Background:

  • Ascorbate peroxidase (APX) is crucial for plant oxidative stress response.
  • Understanding APX redox properties is key to elucidating its catalytic mechanism.

Purpose of the Study:

  • To determine reduction potentials for key redox couples in wild-type APX and site-directed variants.
  • To correlate redox potentials with APX catalytic activity and intermediate stability.

Main Methods:

  • Electrochemical determination of reduction potentials for Compound I/Compound II, Compound II/Fe3+, and Compound I/Fe3+ redox couples.
  • Measurement of Fe3+/Fe2+ potentials in variants to calculate inaccessible Compound II/Fe3+ potentials.

Main Results:

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  • Established reduction potentials for wild-type APX: E°'(Compound I/Compound II) = 1156 mV, E°'(Compound II/Fe3+) = 752 mV, E°'(Compound I/Fe3+) = 954 mV.
  • Demonstrated correlation between measured redox potentials and the higher oxidative reactivity of Compound I versus Compound II.
  • Linked the high reduction potential of Compound I to its thermodynamic instability and observed deviations in Michaelis kinetics.

    • Conclusions:

    • The determined redox potentials provide insights into APX catalysis and the reactivity of its intermediates.
    • The study establishes a framework for evaluating redox properties in APX and related enzymes.
    • Findings contribute to understanding enzyme mechanisms in oxidative stress response.