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Related Experiment Videos

A direct-selection vector derived from pColE3-CA38 and adapted for foreign gene expression.

T Vernet, P C Lau, S A Narang

    Gene
    |January 1, 1985
    PubMed
    Summary

    A new plasmid vector, pVT25, enables direct selection of transformed cells by inactivating lethal colicin E3. This system, when complemented by pVT26, also regulates human proinsulin gene expression for biotechnological applications.

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    Area of Science:

    • Molecular Biology
    • Biotechnology
    • Genetic Engineering

    Background:

    • Plasmid vectors are essential tools in molecular biology for gene cloning and expression.
    • Efficient selection methods for transformed cells are crucial for successful genetic manipulation.
    • Regulating gene expression is key for controlled protein production in biotechnological applications.

    Purpose of the Study:

    • To construct a novel plasmid vector, pVT25, for efficient and direct selection of transformed cells.
    • To demonstrate the utility of pVT25 in regulating the expression of a foreign gene, specifically the human proinsulin gene.
    • To establish a system for controlled production of proinsulin C-peptide.

    Main Methods:

    • Construction of the pVT25 plasmid by fusing elements from pBR327 and pColE3-CA38.

    Related Experiment Videos

  • Complementation of pVT25 with pVT26 to ensure cell viability and plasmid maintenance.
  • Fusion of the synthetic human proinsulin gene to the colE3 gene within pVT25.
  • Monitoring proinsulin C-peptide production using radioimmunoassay.

    • Main Results:

    • pVT25 allows positive selection based on the inactivation of lethal colicin E3 upon foreign DNA insertion.
    • The pVT25/pVT26 system maintains plasmid stability in Escherichia coli.
    • Expression of the human proinsulin gene is successfully regulated by the inducible colE3 promoter.
    • Proinsulin C-peptide production was detected and quantified, confirming gene expression.

    Conclusions:

    • The pVT25 plasmid vector provides an efficient and direct selection system for recombinant DNA technology.
    • This vector system offers a controllable platform for the regulated expression of therapeutic proteins like human proinsulin.
    • The developed system has significant potential for applications in protein production and biotechnology.