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Positive-selection vector for direct protein expression.

Andreas F Haag1, Christian Ostermeier

  • 1Department of Biotechnology & Bioinformatics, Weihenstephan University of Applied Sciences, Freising, Germany.

Biotechniques
|June 2, 2009
PubMed
Summary
This summary is machine-generated.

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A new RHP-AmpS vector enables seamless cloning and high-level protein expression in E. coli. It uses a novel positive-selection system based on beta-lactamase (Bla) gene restoration for ampicillin resistance.

Area of Science:

  • Molecular Biology
  • Biotechnology
  • Microbiology

Background:

  • Traditional cloning methods often involve laborious screening processes to identify recombinant clones.
  • Efficient gene cloning and high-level protein expression are crucial for various biotechnological applications.

Purpose of the Study:

  • To develop a novel positive-selection vector for seamless cloning and high-level protein expression in Escherichia coli.
  • To create a single vector that combines a positive-selection system with an expression cassette.

Main Methods:

  • A positive-selection system was engineered by inactivating the beta-lactamase (Bla) gene with a stop codon.
  • Reconstruction of the Bla gene's C-terminal codon upon target gene insertion restored ampicillin resistance for positive selection.

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  • This selection cassette was integrated into a T7 polymerase-based expression vector (pET28a) for high-level protein production.

    • Main Results:

    • The RHP-AmpS vector successfully enabled positive selection of recombinant clones on ampicillin-containing agar plates.
    • The vector facilitates seamless cloning, streamlining the cloning process.
    • High-level protein expression was achieved directly from the single vector.

    Conclusions:

    • The RHP-AmpS vector represents a significant advancement in cloning technology by offering true positive selection.
    • This novel vector simplifies and enhances the efficiency of generating recombinant proteins in E. coli.
    • It is the first vector to combine direct, high-level expression with a true positive-selection cloning system.