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Simultaneous Measurement of Superoxide/Hydrogen Peroxide and NADH Production by Flavin-containing Mitochondrial Dehydrogenases
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A New Fluorescent Method for Measuring Peroxiredoxin Enzyme Activity Using Monobromobimane.

Nawar Yaseen Mohsin1, Halit Demir1, Mahmoud Hussein Hadwan2

  • 1Faculty of Science, Department of Chemistry, Van Yüzüncü Yıl Üniversitesi, Van, Turkey.

Journal of Fluorescence
|October 23, 2024
PubMed
Summary
This summary is machine-generated.

A new fluorometric assay accurately quantifies peroxiredoxin (Prx) enzyme activity using tert-butyl hydroperoxide (t-BOOH) and monobromobimane (mBB). This safe and reliable method simplifies Prx activity measurement for researchers.

Keywords:
DithiothreitolFluorometryMonobromobimanePeroxiredoxinTert-butyl hydroperoxide

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Area of Science:

  • Biochemistry
  • Enzymology
  • Analytical Chemistry

Background:

  • Peroxiredoxins (Prx) are crucial antioxidant enzymes involved in cellular defense.
  • Accurate quantification of Prx activity is essential for understanding oxidative stress and related diseases.
  • Existing methods for Prx activity measurement often suffer from interference and safety concerns.

Purpose of the Study:

  • To develop a novel, safe, and accurate fluorometric method for quantifying peroxiredoxin (Prx) enzyme activity in vitro.
  • To overcome limitations of existing assays, such as interference from catalase and the use of hazardous reagents.

Main Methods:

  • A fluorometric assay was developed using tert-butyl hydroperoxide (t-BOOH) as a specific substrate for Prx.
  • The reaction is terminated and a fluorescent product generated by adding monobromobimane (mBB).
  • Reaction conditions were optimized, and the assay's performance was validated against a reference method.

Main Results:

  • The novel assay demonstrated high precision and reliability, with a correlation coefficient of 0.995 compared to a reference assay.
  • The use of t-BOOH specifically measures Prx activity, avoiding catalase interference.
  • The mBB reagent efficiently terminates the reaction and produces a fluorescent signal, simplifying the procedure.

Conclusions:

  • The developed mBB-Prx protocol provides a safe, accurate, and convenient method for measuring Prx enzyme activity.
  • This assay eliminates the need for hazardous reagents like sodium azide or concentrated acids.
  • The simplified and safe nature of this assay enhances usability for researchers studying oxidative stress and related biological processes.