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- W2079660114 abstract "The nitrate reductase operon (narGHJI) of Escherichia coli encodes an anaerobic respiratory enzyme. Previous work has identified two cis-acting sites in the nar operon control region: a proximal site required for anaerobic induction mediated by the activator Fnr and a remote upstream site required for nitrate induction mediated by the activator NarL [Li, S. & DeMoss, J. A. (1988) J. Biol. Chem. 263, 13700-13705]. Our search for nar regulatory mutants yielded one strain with a mutation in himD, the structural gene for one of the subunits of integration host factor (IHF). Strains carrying null alleles of the IHF structural genes, himD and himA, had severe defects in nitrate induction of the nar operon but were normal for nitrate induction of the coordinately regulated fdn operon. Anaerobic expression of both operons was normal in him mutants. Gel-mobility-shift and DNase I protection experiments revealed a single IHF binding site in the nar operon control region, located midway between the upstream activation site and the promoter. We conclude that an IHF-mediated DNA bend is essential for efficient nitrate induction of the sigma 70-dependent nar operon promoter. This requirement of IHF for transcriptional activation had been noted for several sigma 54-dependent promoters." @default.
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- W2079660114 date "1992-09-15" @default.
- W2079660114 modified "2023-10-16" @default.
- W2079660114 title "In vivo requirement of integration host factor for nar (nitrate reductase) operon expression in Escherichia coli K-12." @default.
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- W2079660114 doi "https://doi.org/10.1073/pnas.89.18.8701" @default.
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