| Literature DB >> 19666717 |
Guangfei Liu1, Jiti Zhou, Q Shiang Fu, Jing Wang.
Abstract
The physiological role of Escherichia coli azoreductase AzoR was studied. It was found that AzoR was capable of reducing several benzo-, naphtho-, and anthraquinone compounds, which were better substrates for AzoR than the model azo substrate methyl red. The DeltaazoR mutant displayed reduced viability when exposed to electrophilic quinones, which are capable of depleting cellular reduced glutathione (GSH). Externally added GSH can partially restore the impaired growth of the DeltaazoR mutant caused by 2-methylhydroquinone. The transcription of azoR was induced by electrophiles, including 2-methylhydroquinone, catechol, menadione, and diamide. A transcription start point was identified 44 bp upstream from the translation start point. These data indicated that AzoR is a quinone reductase providing resistance to thiol-specific stress caused by electrophilic quinones.Entities:
Mesh:
Substances:
Year: 2009 PMID: 19666717 PMCID: PMC2753034 DOI: 10.1128/JB.00552-09
Source DB: PubMed Journal: J Bacteriol ISSN: 0021-9193 Impact factor: 3.490