Crl, a low temperature-induced protein in Escherichia coli that binds directly to the stationary phase sigma subunit of RNA polymerase. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Biological Chemistry Année : 2004

Crl, a low temperature-induced protein in Escherichia coli that binds directly to the stationary phase sigma subunit of RNA polymerase.

Résumé

The alternative sigma factor sigma(S) (RpoS) of Escherichia coli RNA polymerase regulates the expression of stationary phase and stress-response genes. sigma(S) is also required for the transcription of the cryptic genes csgBA that encode the subunits of the curli proteins. The expression of the csgBA genes is regulated in response to a multitude of physiological signals. In stationary phase, these genes are transcribed by the sigma(S) factor, and expression of the operon is enhanced by the small protein Crl. It has been shown that Crl stimulates the activity of sigma(S), leading to an increased transcription rate of a subset of genes of the rpoS regulon in stationary phase. However, the underlying molecular mechanism has remained elusive. We show here that Crl interacts directly with sigma(S) and that this interaction promotes binding of the sigma(S) holoenzyme (Esigma(S)) to the csgBA promoter. Expression of Crl is increased during the transition from growing to stationary phase. Crl accumulates in stationary phase cells at low temperature (30 degrees C) but not at 37 degrees C. We therefore propose that Crl is a second thermosensor, besides DsrA, controlling sigma(S) activity.

Dates et versions

hal-00173294 , version 1 (19-09-2007)

Identifiants

Citer

Alexandre Bougdour, Cécile Lelong, Johannes Geiselmann. Crl, a low temperature-induced protein in Escherichia coli that binds directly to the stationary phase sigma subunit of RNA polymerase.. Journal of Biological Chemistry, 2004, 279 (19), pp.19540-50. ⟨10.1074/jbc.M314145200⟩. ⟨hal-00173294⟩

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