PMID:8152423

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Citation

Levinthal, M, Lejeune, P and Danchin, A (1994) The H-NS protein modulates the activation of the ilvIH operon of Escherichia coli K12 by Lrp, the leucine regulatory protein. Mol. Gen. Genet. 242:736-43

Abstract

The H-NS protein, the product of the hns gene, plays a central role in the cellular response of bacteria to environmental stresses such as modification of osmolarity and temperature. The leucine regulatory protein (Lrp) controls a wide array of operons both as an activator (e.g. ilvIH) and as a repressor. We demonstrate that H-NS can decrease the activity of Lrp in stationary phase and under conditions of high osmolarity. Strains containing hns mutations have higher levels of Lrp-activated ilvIH transcription, while strains carrying the hns+ allele on a pBR322 plasmid have lower activity of Lrp-directed ilvIH gene expression.

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Keywords

Alleles; Bacterial Outer Membrane Proteins/genetics; Bacterial Proteins/genetics; DNA-Binding Proteins/genetics; Escherichia coli/genetics; Escherichia coli/growth & development; Escherichia coli/metabolism; Escherichia coli Proteins; Gene Expression Regulation, Bacterial; Genes, Bacterial; Leucine-Responsive Regulatory Protein; Multigene Family; Mutation; Operon; Regulon; Transcription Factors; Transcription, Genetic; Transcriptional Activation; Water-Electrolyte Balance/genetics

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