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Related Experiment Videos

The interaction between Cu(I) superoxide dismutase and hydrogen peroxide.

D E Cabelli1, D Allen, B H Bielski

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973.

The Journal of Biological Chemistry
|June 15, 1989
PubMed
Summary

Superoxide dismutase (SOD) interacts with peroxide, with the hydroperoxide anion (HO2-) identified as the active species. This interaction

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Area of Science:

  • Biochemistry
  • Enzyme kinetics
  • Free radical chemistry

Background:

  • Superoxide dismutase (SOD) is a crucial enzyme in cellular defense against oxidative stress.
  • Understanding the precise mechanism of SOD's interaction with reactive oxygen species is vital for elucidating its biological role.
  • Previous studies suggested a role for peroxide in SOD activity, but the specific active species remained unclear.

Purpose of the Study:

  • To investigate the interaction mechanism between superoxide dismutase (SOD) and peroxide under anaerobic conditions.
  • To identify the specific peroxide species that actively participates in the enzymatic reaction.
  • To determine the kinetic parameters and pH dependence of the SOD-peroxide interaction.

Main Methods:

  • Enzyme kinetics studies were performed using superoxide dismutase (SOD).

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  • Reactions were conducted under anaerobic conditions with a hydroxyl radical scavenger (formate) and nitro blue tetrazolium indicator.
  • Rate studies were analyzed as a function of pH to elucidate the active species and reaction mechanism.

    • Main Results:

    • The interaction involves five reactions and an equilibrium, with Reaction 3 being proportional to both peroxide and enzyme concentration.
    • Kinetic analysis indicated no intermediate peroxide-enzyme complex formation.
    • Rate studies as a function of pH confirmed that the hydroperoxide anion (HO2-) is the active species, not hydrogen peroxide (H2O2), with a rate constant of k(HO2- + SOD-Cu+) = 2.6 x 10^3 M^-1 s^-1.
    • Evidence suggests that HO2- reacts with SOD in a manner influenced by electrostatic forces, similar to O2-.

    Conclusions:

    • The hydroperoxide anion (HO2-) is the active species interacting with superoxide dismutase (SOD).
    • The reaction rate is dependent on the concentration of both HO2- and SOD.
    • Electrostatic interactions play a role in the reaction between HO2- and the enzyme's copper center.