Comparison of the Azoreductase and Nitroreductase from Clostridium Perfringens

Overview

Journal Appl Environ Microbiol

Specialties Environmental Health
Microbiology

Date 1993 Jun 1

PMID 8328797

Citations 6

Authors

F Rafii

C E Cerniglia

Affiliations

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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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Crystallization and preliminary X-ray analysis of AzoR (azoreductase) from Escherichia coli.

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Reduction of azo dyes and nitroaromatic compounds by bacterial enzymes from the human intestinal tract.

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