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Related Experiment Videos

Copy-control tightly regulated expression vectors based on pBAC/oriV.

Jadwiga Wild1, Waclaw Szybalski

  • 1McArdle Laboratory for Cancer Research, University of Wisconsin Medical School, Madison, USA.

Methods in Molecular Biology (Clifton, N.J.)
|July 23, 2004
PubMed
Summary

This study introduces novel copy-control expression vectors for tightly regulated gene expression in E. coli. These vectors allow single-copy maintenance when uninduced, minimizing background expression of toxic genes.

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Copy-control pBAC/oriV vectors for genomic cloning.

Methods in molecular biology (Clifton, N.J.)·2004

Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genetic Engineering

Background:

  • Conventional expression vectors often suffer from high background expression, complicating the study of toxic genes.
  • Tight regulation of both plasmid copy number and gene expression is crucial for efficient recombinant protein production.

Purpose of the Study:

  • To develop novel expression vectors with dual regulation of plasmid copy number and gene expression.
  • To enable tightly controlled gene expression and high-level protein production in E. coli.

Main Methods:

  • Construction of copy-control expression vectors based on pBAC/oriV plasmids.
  • Utilizing inducible promoters such as l-arabinose-inducible Para (araC-PBAD) and rhamnose-inducible Prha (rhaS-Prha).
  • Demonstrating simultaneous induction of plasmid amplification and cloned gene expression.

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Main Results:

  • Achieved up to a 50,000-fold increase in cloned gene expression upon induction.
  • Maintained single-copy plasmid status when uninduced, resulting in very low background expression.
  • Demonstrated utility in most E. coli hosts.

Conclusions:

  • The novel copy-control expression vectors offer superior regulation for gene expression.
  • These vectors are advantageous for maintaining toxic genes and achieving high yields of recombinant proteins.
  • The developed system provides a versatile platform for various E. coli expression applications.