• Title/Summary/Keyword: Gene regulation

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Control of Acetate Production Rate in Escherichia coli by Regulating Expression of Single-Copy pta Using $lacI^Q$ in Multicopy Plasmid

  • Lee, Sun-Gu;Liao, James C
    • Journal of Microbiology and Biotechnology
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    • v.18 no.2
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    • pp.334-337
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    • 2008
  • A tightly regulated gene expression system composed of a single-copy target gene under the control of a lac promoter derivative and lacI gene in a multicopy plasmid is proposed, and its ability to control the flux of a metabolic pathway is demonstrated. A model system to control the flux of acetyl-CoA to acetyl phosphate was constructed by integrating pta, a gene encoding phosphotransacetylase, under a tac promoter into the chromosome of E. coli with a pta-negative background and transforming a multicopy plasmid containing the $lacI^Q$ gene into the strain. The production rate of acetate was shown to be tightly controlled when varying the concentration of the inducer (IPTG) in he model system.