doi: 10.1093/nar/21.16.3667.
Sigma s-dependent promoters in Escherichia coli are located in DNA regions with intrinsic curvature
Affiliations
- PMID: 8367283
- PMCID: PMC309863
- DOI: 10.1093/nar/21.16.3667
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Sigma s-dependent promoters in Escherichia coli are located in DNA regions with intrinsic curvature
Nucleic Acids Res.
.
Free PMC article
Abstract
Expression of a number of genes during stationary phase in Escherichia coli is controlled by the alternative sigma factor sigma s (KatF). Promoters recognized by sigma s do not present a well-defined consensus sequence in their -10 and -35 regions. By polyacrylamide gel electrophoresis of DNA fragments performed at different temperatures, and by computer prediction analyses, we have found that sigma s-regulated promoters are located in regions where DNA shows intrinsic curvatures. This feature does not appear in a stationary-phase-induced promoter which is not controlled by sigma s. We propose that DNA bending may help in recognition and/or binding of sigma s to stationary-phase-induced promoters.
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