Interaction of a redox-sensitive DNA-binding factor with the 5'-flanking region of the micF gene in Escherichia coli.
The product of the micF gene is an endogenous antisense RNA which down-regulates the expression of a major outer membrane protein, OmpF, in E. coli. We report here that two DNA-binding factors compete for the same site in the promoter region of the micF gene: RSBF, a high-affinity redox-sensitive DNA-binding factor that responds to an active oxygen species other than hydrogen peroxide or superoxide anions; and HRBF a heat-resistant DNA-binding factor. Both RSBF and HRBF bind to the same DNA sequence, 5'-TTAAAATCAATAACTTATTCTTAA3-', located upstream of the transcription start site of the micF gene. We present evidence that RSBF could be the controlling factor of a novel regulon involved in the response to oxidative stress in E. coli.
Gidrol
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Harvard School of Public Health, Department of Cellular and Molecular Toxicology, Boston, Massachusetts 02115.
Farr
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D001425:Bacterial Outer Membrane Proteins / Q000235:genetics; D001483:Base Sequence; D001665:Binding Sites / Q000235:genetics; D001667:Binding, Competitive; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics / Q000378:metabolism*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004926:Escherichia coli / Q000187:drug effects / Q000235:genetics* / Q000378:metabolism*; D015964:Gene Expression Regulation, Bacterial / Q000187:drug effects; D005798:Genes, Bacterial; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D010269:Paraquat / Q000494:pharmacology; D016372:RNA, Antisense / Q000235:genetics / Q000378:metabolism
D001425:Bacterial Outer Membrane Proteins; D017931:DNA Primers; D004269:DNA, Bacterial; D004268:DNA-Binding Proteins; D016372:RNA, Antisense; D010269:Paraquat