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Consensus Sequence for Escherichia coli Heat Shock Gene Promoters

Deborah W. Cowing, James C. A. Bardwell, Elizabeth A. Craig, Carol Woolford, Roger W. Hendrix and Carol A. Gross
Proceedings of the National Academy of Sciences of the United States of America
Vol. 82, No. 9 (May 1, 1985), pp. 2679-2683
Stable URL: http://www.jstor.org/stable/25240
Page Count: 5
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Consensus Sequence for Escherichia coli Heat Shock Gene Promoters
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Abstract

We have identified promoters for the Escherichia coli heat shock operons dnaK and groE and the gene encoding heat shock protein C62.5. Transcription from each promoter is heat-inducible in vivo, and each is recognized in vitro by RNA polymerase containing σ 32, the σ factor encoded by rpoH (htpR) but not by RNA polymerase containing σ 70. We compared the sequences of the heat shock promoters and propose a consensus promoter sequence, having T-N-t-C-N-C-c-C-T-T-G-A-A in the -35 region and C-C-C-C-A-T-t-T-a in the -10 region. These sequences differ from the consensus sequence recognized by holoenzyme containing σ 70, the major σ in E. coli. We suggest that the accumulated consensus sequences of promoters recognized by alternate forms of holoenzyme are compatible with a model in which σ recognizes only the -10 region of the promoter.

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