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Related Experiment Video

Updated: May 7, 2026

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
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Published on: February 24, 2018

Superoxide reductase: different interaction modes with its two redox partners.

Rui M Almeida1, Paola Turano, Isabel Moura

  • 1REQUIMTE/CQFB, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus da Caparica, 2829-516 Caparica (Portugal).

Chembiochem : a European Journal of Chemical Biology
|September 17, 2013
PubMed
Summary

Anaerobic bacteria use superoxide reductase to detoxify oxygen. This study reveals how rubredoxin and desulforedoxin interact with superoxide reductase, showing they compete for the same binding site but interact differently.

Keywords:
NMR restrained dockingdesulforedoxinelectron-transfer complexesparamagnetic relaxation enhancementrubredoxinsuperoxide reductases

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Defining Hsp33's Redox-regulated Chaperone Activity and Mapping Conformational Changes on Hsp33 Using Hydrogen-deuterium Exchange Mass Spectrometry
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Published on: June 7, 2018

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Enzymology

Background:

  • Anaerobic organisms possess systems to neutralize reactive oxygen species.
  • Superoxide reductase (SOR) is crucial for detoxifying superoxide anions (O2.-) to hydrogen peroxide (H2O2).
  • Electron transfer to SOR is facilitated by redox partners like rubredoxin and desulforedoxin in Desulfovibrio gigas.

Purpose of the Study:

  • To characterize the interaction between Desulfovibrio gigas superoxide reductase and its electron donors, rubredoxin and desulforedoxin.
  • To elucidate the binding interfaces and kinetic parameters of these electron transfer complexes.
  • To determine if rubredoxin and desulforedoxin compete for the same binding site on superoxide reductase.

Main Methods:

  • Steady-state kinetics
  • 2D NMR titrations
  • Backbone relaxation measurements
  • Paramagnetic relaxation enhancement
  • Restrained molecular docking

Main Results:

  • Rubredoxin binds to superoxide reductase via hydrophobic residues near its metal center, with a dissociation constant (Kd) of 3 μM at 59 mM ionic strength.
  • Desulforedoxin interacts with superoxide reductase, exhibiting electron transfer with a maximum rate constant (kapp) of (31 ± 7) min⁻¹ at 57 mM ionic strength.
  • Competition experiments and molecular docking indicate that both rubredoxin and desulforedoxin bind to the same site on superoxide reductase, albeit with different binding dynamics.

Conclusions:

  • Rubredoxin and desulforedoxin are competitive inhibitors of each other's interaction with superoxide reductase.
  • The binding of desulforedoxin to superoxide reductase is more dynamic and transient compared to rubredoxin.
  • Understanding these interactions provides insights into the enzymatic mechanisms of oxygen detoxification in anaerobic microorganisms.