cis-Acting ompF mutations that result in OmpR-dependent constitutive expression

J. M. Slauch, T. J. Silhavy

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141 Scopus citations


OmpR and EnvZ differentially control the transcription of the major outer membrane porin genes, ompF and ompC, in Escherichia coli in response to the osmolarity of the medium. We have previously provided evidence that OmpR works both positively and negatively at the ompF promoter to give the characteristic switch from OmpF to OmpC production with increasing osmolarity. Here, we describe the isolation of cis-acting ompF mutations that affect negative regulation by OmpR by affecting the three-dimensional structure of the promoter region as measured by agarose gel mobility. These results further clarify the mechanism by which OmpR negatively regulates ompF expression, suggesting a model in which OmpR forms a repressive loop in the ompF promoter region.

Original languageEnglish (US)
Pages (from-to)4039-4048
Number of pages10
JournalJournal of bacteriology
Issue number13
StatePublished - 1991
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Molecular Biology
  • Microbiology


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