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Updated: Jul 16, 2025

Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
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Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases

Published on: February 24, 2018

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Reduction of Hydrogen Peroxide by Human Mitochondrial Amidoxime Reducing Component Enzymes

Sophia Rixen1, Patrick M Indorf1, Christian Kubitza2

  • 1Department of Pharmaceutical and Medicinal Chemistry, Pharmaceutical Institute, Kiel University, 24118 Kiel, Germany.

Molecules (Basel, Switzerland)
|September 9, 2023
PubMed

Insights

The human mitochondrial amidoxime reducing component (mARC) enzymes may play a role in cellular oxidative stress response. This study shows mARC enzymes reduce hydrogen peroxide (H2O2), a reactive oxygen species.

Area of Science:

  • Biochemistry
  • Cellular Biology
  • Enzymology

Background:

  • The mitochondrial amidoxime reducing component (mARC) is a human molybdoenzyme.
  • mARC enzymes are known to catalyze the reduction of N-oxygenated substrates.
  • The physiological function of mARC enzymes remains largely unknown.

Purpose of the Study:

  • To investigate the reduction of hydrogen peroxide (H2O2) by human mARC1 and mARC2 enzymes.
  • To explore the role of mARC enzymes in the cellular response to oxidative stress.

Main Methods:

  • Enzymatic assays to study H2O2 reduction by mARC1 and mARC2.
  • Generation and analysis of HEK-293T cells with an MTARC1 knockout.

Main Results:

  • Human mARC1 and mARC2 enzymes were shown to reduce H2O2.
  • HEK-293T cells with MTARC1 knockout exhibited increased sensitivity to H2O2.
  • H2O2 was identified as the first mARC substrate lacking a nitrogen-oxygen bond.

Conclusions:

  • mARC enzymes are implicated in the cellular response to oxidative stress.
  • The substrate spectrum of mARC enzymes may extend beyond N-oxygenated compounds to include molecules like H2O2.
Keywords:
hydrogen peroxidemolybdenum enzymereactive oxygen species

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