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NADPH: ferredoxin oxidoreductase acts as a paraquat diaphorase and is a member of the soxRS regulon.

By S I Liochev, A Hausladen, W F Beyer and I Fridovich

Abstract

Soluble extracts of Escherichia coli contain four NADPH:paraquat diaphorases that were separable by anion-exchange HPLC over Mono Q. One of these was induced when the cells were exposed to paraquat. This was the case in a soxRS-competent strain but not in a soxRS-null strain, while a soxRS-constitutive strain overexpressed this diaphorase without the stimulus of exposure to paraquat. This NADPH:paraquat diaphorase could use cytochrome c or nitroblue tetrazolium as an electron acceptor, whereas O2 was a relatively poor acceptor. This diaphorase was identified as the NADPH:ferredoxin reductase. A role for reduced ferredoxin and flavodoxin in the adaptive soxRS response to oxidative stress and in the regulation of the redox status of soxR is discussed

Topics: Research Article
Year: 1994
OAI identifier: oai:pubmedcentral.nih.gov:43151
Provided by: PubMed Central
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