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Abstract
Expression of the ompF gene coding for a major outer membrane protein of Escherichia coli is regulated by osmolarity of the medium. The ompF expression is controlled by a transcriptional activation mechanism which requires the ompR gene product acting on a region located upstream from the canonical −35 and −10 regions of the ompF gene. Evidence is presented that the upstream region of the ompF promoter contains a static bend of DNA having two sets of oligo (dA · dT) tracts with periodical spacing. It was demonstrated that the bending region overlaps with the recognition site for the activator protein, OmpR.
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