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Translational autocontrol of the Escherichia coli hfq RNA chaperone gene

BRANISLAV VEEREK, ISABELLA MOLL and UDO BLÄSI

Max F. Perutz Laboratories, Department of Microbiology and Immunobiology, University Departments at the Vienna Biocenter, 1030 Vienna, Austria

Reprint requests to: Udo Bläsi, Max F. Perutz Laboratories, Department of Microbiology and Immunobiology, University Departments at the Vienna Biocenter, Dr. Bohrgasse 9/4, 1030 Vienna, Austria; e-mail: Udo. Blaesi{at}univie.ac.at; fax: 43-1-4277-9546.

The conserved bacterial RNA chaperone Hfq has been shown to play an important role in post-transcriptional regulation. Here, we demonstrate that Hfq synthesis is autoregulated at the translational level. We have mapped two Hfq binding sites in the 5'-untranslated region of hfq mRNA and show that Hfq binding inhibits formation of the translation initiation complex. In vitro translation and in vivo studies further revealed that Hfq binding to both sites is required for efficient translational repression of hfq mRNA.

Keywords: Hfq; translation; autogenous repression

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