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Related Experiment Videos

Multiple cis-acting sites positively regulate Escherichia coli nrd expression

B A Jacobson1, J A Fuchs

  • 1Department of Biochemistry, University of Minnesota, St. Paul 55108, USA.

Molecular Microbiology
|July 29, 1998
PubMed
Summary

Regulation of nrd expression in Escherichia coli involves multiple upstream sites acting independently. These cis-acting elements control nrd gene expression across different growth phases and DNA synthesis inhibition.

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Area of Science:

  • Molecular Biology
  • Microbial Genetics
  • Gene Regulation

Background:

  • The regulation of nrd gene expression in Escherichia coli (E. coli) is crucial for DNA synthesis and cell cycle progression.
  • Previous understanding suggested simpler regulatory mechanisms for nrd expression.
  • Identifying cis-acting elements involved in nrd regulation is key to understanding its complex control.

Purpose of the Study:

  • To investigate the complex regulatory mechanisms of nrd expression in Escherichia coli.
  • To identify and characterize the cis-acting elements that positively regulate nrd expression.
  • To determine if these regulatory sites control nrd expression during different physiological states, including cell cycle and DNA synthesis inhibition.

Main Methods:

  • Utilized site-directed mutagenesis to create double mutants defective in identified upstream regulatory sites.

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  • Analyzed nrd gene expression levels in wild-type and mutant strains under various conditions (exponential growth, DNA synthesis inhibition).
  • Compared nrd expression patterns to assess the independence and function of regulatory sites.

    • Main Results:

    • Identified at least five upstream cis-acting elements positively regulating nrd expression: a Fis binding site, a DnaA binding site, an AT-rich region, an inverted repeat, and a 10 bp site.
    • Demonstrated that these regulatory sites act independently in controlling nrd expression, as shown by double mutant analysis.
    • Found that nrd expression is regulated by the same mechanism in exponentially growing and DNA synthesis-inhibited cultures, and that cell cycle regulation is controlled by these identified sites.

    Conclusions:

    • The regulation of nrd expression in E. coli is more complex than previously thought, involving multiple independent cis-acting elements.
    • These regulatory sites are essential for both basal nrd expression and its induction during DNA synthesis inhibition and cell cycle progression.
    • The study clarifies the role of specific sites, such as the Fis binding site and AT-rich region, in nrd regulation.