PMID:9006049
| Citation |
Free, A and Dorman, CJ (1997) The Escherichia coli stpA gene is transiently expressed during growth in rich medium and is induced in minimal medium and by stress conditions. J. Bacteriol. 179:909-18 |
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| Abstract |
The transcriptional regulation of the stpA gene, encoding the Escherichia coli H-NS-like protein StpA, has been studied as a function of a variety of environmental conditions, and its response to trans-acting factors has been characterized. Chromosomally located stpA is expressed primarily from a promoter immediately upstream of the gene which is severely repressed by the homologous nucleoid-associated protein H-NS. However, we show here that even in a strain containing functional H-NS, stpA is transiently induced during growth of a batch culture in rich medium. It can also be induced strongly by osmotic shock and, to a lesser extent, by an increase in growth temperature. Moreover, when cells are grown in minimal medium, we observe a more sustained induction of stpA which is dependent on the leucine-responsive regulatory protein (Lrp). This enhanced level of stpA transcription is virtually abolished in an H-NS-independent manner when the culture undergoes carbon starvation. A sensitivity of the stpA promoter to DNA topology may contribute to some of these responses. Results reported here show that cloned fragments of the stpA promoter region can confer H-NS and Lrp responsiveness upon a lacZ reporter gene and suggest that several hundred base pairs of DNA upstream of the transcriptional start may be required for regulation by these two proteins. |
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| Keywords |
Bacterial Outer Membrane Proteins/genetics; Bacterial Outer Membrane Proteins/metabolism; Bacterial Proteins/biosynthesis; Carbon/metabolism; Carrier Proteins/metabolism; Chromosomes, Bacterial; Culture Media; DNA, Bacterial/chemistry; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; Escherichia coli/genetics; Escherichia coli Proteins; Gene Expression Regulation, Bacterial; Genes, Bacterial; Hot Temperature; Integration Host Factors; Low Density Lipoprotein Receptor-Related Protein-1; Molecular Chaperones; Mutation; Nucleic Acid Conformation; Osmotic Pressure; Promoter Regions, Genetic; Receptors, Immunologic/genetics; Receptors, Immunologic/metabolism; Recombinant Fusion Proteins/biosynthesis; Starvation; Suppression, Genetic; Time Factors |
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