PMID:15066043
| Citation |
Dole, S, Nagarajavel, V and Schnetz, K (2004) The histone-like nucleoid structuring protein H-NS represses the Escherichia coli bgl operon downstream of the promoter. Mol. Microbiol. 52:589-600 |
|---|---|
| Abstract |
Specificity of repression by the histone-like nucleoid structuring protein and pleiotropic regulator, H-NS, is exceptionally high in case of the Escherichia coli bgl (beta-glucoside) operon. Here we present evidence that H-NS represses the operon at two levels. The binding of H-NS to an upstream silencer results in an approximately threefold repression of the catabolite gene regulator protein (CRP) dependent bgl promoter. In addition, H-NS binds to a silencer region located approximately 600-700 base pairs downstream of the promoter, within the coding region of first gene, bglG, resulting in a approximately sevenfold further decrease of expression. Repression by H-NS at the downstream silencer requires termination factor Rho and is reduced by translation of the bglG mRNA, but is independent of the promoter. This suggests that H-NS induces polarity of transcription by acting as a roadblock to the elongating RNA polymerase. The control of the bgl operon by H-NS at two levels results in a highly specific repression. |
| Links |
PubMed Online version:10.1111/j.1365-2958.2004.04001.x |
| Keywords |
Bacterial Proteins/genetics; Bacterial Proteins/metabolism; DNA-Binding Proteins/genetics; DNA-Binding Proteins/metabolism; Escherichia coli/genetics; Gene Expression Regulation, Bacterial; Glucosides/genetics; Glucosides/metabolism; Models, Genetic; Operon; Promoter Regions, Genetic; Transcription, Genetic |
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