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Appl. Environ. Microbiol., Apr 1997, 1421-1427, Vol 63, No. 4
Copyright © 1997, American Society for Microbiology

Catabolism of 3-Nitrophenol by Ralstonia eutropha JMP 134

A Schenzle, H Lenke, P Fischer, PA Williams and H Knackmuss
Fraunhofer Institut fur Grenzflachen-und Bioverfahrenstechnik, Institut fur Mikrobiologie der Universitat Stuttgart, and Institut fur Organische Chemie der Universitat Stuttgart, D-70569 Stuttgart, Germany, and Department of Biochemistry and Soil Science, University College of North Wales, Bangor, Wales

Ralstonia eutropha JMP 134 utilizes 3-nitrophenol as the sole source of nitrogen, carbon, and energy. The entire catabolic pathway of 3-nitrophenol is chromosomally encoded. An initial NADPH-dependent reduction of 3-nitrophenol was found in cell extracts of strain JMP 134. By use of a partially purified 3-nitrophenol nitroreductase from 3-nitrophenol-grown cells, 3-hydroxylaminophenol was identified as the initial reduction product. Resting cells of R. eutropha JMP 134 metabolized 3-nitrophenol to N-acetylaminohydroquinone under anaerobic conditions. With cell extracts, 3-hydroxylaminophenol was converted into aminohydroquinone. This enzyme-mediated transformation corresponds to the acid-catalyzed Bamberger rearrangement. Enzymatic conversion of the analogous hydroxylaminobenzene yields a mixture of 2- and 4-aminophenol.

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