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- W2100060608 abstract "ABSTRACT Escherichia coli , a facultative aerobe, expresses two distinct respiratory nitrate reductases. The periplasmic NapABC enzyme likely functions during growth in nitrate-limited environments, whereas the membrane-bound NarGHI enzyme functions during growth in nitrate-rich environments. Maximal expression of the napFDAGHBC operon encoding periplasmic nitrate reductase results from synergistic transcription activation by the Fnr and phospho-NarP proteins, acting in response to anaerobiosis and nitrate or nitrite, respectively. Here, we report that, during anaerobic growth with no added nitrate, less-preferred carbon sources stimulated napF operon expression by as much as fourfold relative to glucose. Deletion analysis identified a cyclic AMP receptor protein (Crp) binding site upstream of the NarP and Fnr sites as being required for this stimulation. The napD and nrfA operon control regions from Shewanella spp. also have apparent Crp and Fnr sites, and expression from the Shewanella oneidensis nrfA control region cloned in E. coli was subject to catabolite repression. In contrast, the carbon source had relatively little effect on expression of the narGHJI operon encoding membrane-bound nitrate reductase under any growth condition tested. Carbon source oxidation state had no influence on synthesis of either nitrate reductase. The results suggest that the Fnr and Crp proteins may act synergistically to enhance NapABC synthesis during growth with poor carbon sources to help obtain energy from low levels of nitrate." @default.
- W2100060608 created "2016-06-24" @default.
- W2100060608 creator A5000226146 @default.
- W2100060608 creator A5045138056 @default.
- W2100060608 creator A5054984781 @default.
- W2100060608 creator A5089420945 @default.
- W2100060608 date "2009-02-01" @default.
- W2100060608 modified "2023-10-07" @default.
- W2100060608 title "Catabolite Repression Control of<i>napF</i>(Periplasmic Nitrate Reductase) Operon Expression in<i>Escherichia coli</i>K-12" @default.
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- W2100060608 doi "https://doi.org/10.1128/jb.00873-08" @default.
- W2100060608 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2632075" @default.
- W2100060608 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/19060147" @default.
- W2100060608 hasPublicationYear "2009" @default.
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