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Related Experiment Videos

cis-acting ompF mutations that result in OmpR-dependent constitutive expression.

J M Slauch1, T J Silhavy

  • 1Department of Molecular Biology, Lewis Thomas Laboratory, Princeton University, New Jersey 08544-1014.

Journal of Bacteriology
|July 1, 1991
PubMed
Summary

The OmpR protein negatively regulates the ompF gene in Escherichia coli by forming a loop structure in the promoter region. This finding clarifies how OmpR controls outer membrane porin gene expression in response to environmental osmolarity.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Genetics

Background:

  • The transcription of major outer membrane porin genes (ompF and ompC) in Escherichia coli is controlled by OmpR and EnvZ in response to medium osmolarity.
  • OmpR is known to act both positively and negatively at the ompF promoter, mediating the switch from OmpF to OmpC production as osmolarity increases.

Purpose of the Study:

  • To investigate the mechanism of negative regulation of ompF expression by OmpR.
  • To identify specific mutations affecting OmpR's negative regulatory function.

Main Methods:

  • Isolation of cis-acting ompF mutations.
  • Assessment of the three-dimensional structure of the ompF promoter region using agarose gel mobility assays.

Main Results:

Related Experiment Videos

  • Identified ompF mutations that impair negative regulation by OmpR.
  • Demonstrated that these mutations alter the three-dimensional structure of the ompF promoter region.
  • Provided evidence that OmpR negatively regulates ompF by forming a repressive loop structure.

Conclusions:

  • OmpR negatively regulates ompF expression through a mechanism involving the formation of a DNA loop.
  • The structural changes in the promoter region caused by mutations affect this negative regulation.
  • This study enhances the understanding of bacterial gene regulation in response to environmental cues.