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Journal of Bacteriology, January 1999, p. 401-410, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Heat-Induced Synthesis of sigma 32 in Escherichia coli: Structural and Functional Dissection of rpoH mRNA Secondary Structure

Miyo Morita, Masaaki Kanemori, Hideki Yanagi, and Takashi Yura*

HSP Research Institute, Kyoto Research Park, Kyoto 600-8813, Japan

Received 18 June 1998/Accepted 6 November 1998

The heat shock response in Escherichia coli depends primarily on the increased synthesis and stabilization of otherwise scarce and unstable sigma 32 (rpoH gene product), which is required for the transcription of heat shock genes. The heat-induced synthesis of sigma 32 occurs at the level of translation, and genetic evidence has suggested the involvement of a secondary structure at the 5' portion (nucleotides -19 to +247) of rpoH mRNA in regulation. We now present evidence for the mRNA secondary structure model by means of structure probing of RNA with chemical and enzymatic probes. A similar analysis of several mutant RNAs with a mutation predicted to alter a base pairing or with two compensatory mutations revealed altered secondary structures consistent with the expression and heat inducibility of the corresponding fusion constructs observed in vivo. These findings led us to assess the possible roles of each of the stem-loop structures by analyzing an additional set of deletions and base substitutions. The results indicated not only the primary importance of base pairings between the translation initiation region of ca. 20 nucleotides (the AUG initiation codon plus the "downstream box") and the internal region of rpoH mRNA but also the requirement of appropriate stability of mRNA secondary structures for characteristic thermoregulation, i.e., repression at a low temperature and induction upon a temperature upshift.

* Corresponding author. Mailing address: HSP Research Institute, Kyoto Research Park, Kyoto 600-8813, Japan. Phone: (81)-75-315-8619. Fax: (81)-75-315-8659. E-mail: tyura{at}hsp.co.jp.

Journal of Bacteriology, January 1999, p. 401-410, Vol. 181, No. 2
0021-9193/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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