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Related Experiment Videos

Gene expression enhancement due to plasmid maintenance

J C Diaz-Ricci1, J Bode, J I Rhee

  • 1Departamento de Bioquímica de la Nutrición, Instituto Superior de Investigaciones Biológicas (CONICET-UNT), Tucumán, Argentina.

Journal of Bacteriology
|November 1, 1995
PubMed
Summary

Plasmid maintenance in Escherichia coli boosts gene expression and glucose uptake by increasing cyclic AMP (cAMP) levels. This suggests a cAMP-mediated release of the glucose effect, independent of plasmid specifics.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • Gene expression regulation in bacteria is complex.
  • The glucose effect impacts bacterial metabolic pathways.
  • Plasmids can influence host cell physiology.

Purpose of the Study:

  • To investigate the effect of plasmid maintenance on gene expression in Escherichia coli.
  • To determine the role of cyclic AMP (cAMP) in plasmid-mediated gene enhancement.
  • To explore the impact of plasmids on glucose uptake and the glucose effect.

Main Methods:

  • Analysis of chromosomic beta-galactosidase activity in E. coli strains with and without plasmids.
  • Measurement of intracellular cyclic AMP (cAMP) concentrations.
  • Assessment of specific glucose uptake rates.

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Main Results:

  • Plasmid maintenance significantly enhances beta-galactosidase gene expression.
  • Gene enhancement correlates with a small increase in intracellular cAMP concentration.
  • Cells with plasmids exhibit higher specific glucose uptake rates.
  • These effects suggest a cAMP-mediated alleviation of the glucose effect.

Conclusions:

  • Plasmid maintenance enhances gene expression and glucose uptake in E. coli.
  • The observed effects are mediated by increased intracellular cAMP levels.
  • The plasmid-induced release of the glucose effect is independent of host and plasmid type/number.