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Updated: Aug 14, 2026

Monitoring the Reductive and Oxidative Half-Reactions of a Flavin-Dependent Monooxygenase using Stopped-Flow Spectrophotometry
Published on: March 18, 2012
Comparison of the azoreductase and nitroreductase from Clostridium perfringens
1Division of Microbiology, National Center for Toxicological Research, Food and Drug Administration, Jefferson, Arkansas 72079.
Abstract:
The purified azoreductase and nitroreductase of Clostridium perfringens, which have similar electrophoretic properties, both reacted in a Western blot (immunoblot) with a polyclonal antibody raised against the azoreductase. The activity of both enzymes was enhanced by flavin adenine dinucleotide and was inhibited by menadione, o-iodosobenzoic acid, and the antibody against azoreductase. Reduction of the azo dye Direct Blue 15 by the azoreductase was inhibited by nitroaromatic compounds. The apparent Km of the enzyme for reduction of Direct Blue 15 in the presence of 1-nitropyrene was higher than the Km with the azo dye alone, demonstrating competitive inhibition. The data show that the same protein is involved in the reduction of both azo dyes and nitroaromatic compounds.
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