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Related Experiment Videos

Plasmid shuttle vector with two insertionally inactivable markers for coryneform bacteria.

J Nesvera1, M Pátek, J Hochmannová

  • 1Department of Microbial Genetics, Czechoslovak Academy of Sciences, Prague.

Folia Microbiologica
|January 1, 1990
PubMed
Summary

A novel shuttle vector, pCEM500, was developed for Escherichia coli and Brevibacterium flavum. This engineered vector facilitates gene transfer into B. flavum, an important amino-acid-producing bacterium.

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Area of Science:

  • Molecular Biology
  • Microbial Genetics
  • Biotechnology

Background:

  • Brevibacterium flavum is a key industrial microorganism for amino acid production.
  • Efficient genetic manipulation tools are crucial for strain improvement in B. flavum.
  • Shuttle vectors enable gene expression and manipulation across different bacterial hosts.

Purpose of the Study:

  • To construct a novel shuttle vector for use in both Escherichia coli and Brevibacterium flavum.
  • To create a versatile tool for gene cloning and transfer into B. flavum.
  • To develop a system for genetic modification of amino-acid-producing coryneform bacteria.

Main Methods:

  • Construction of the pCEM500 shuttle vector.
  • Incorporation of dual antibiotic resistance markers (Kmr/Gmr and Smr/Spr) for selection.

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  • Verification of vector replication and stable maintenance in E. coli and B. flavum.
  • Demonstration of gene inactivation via unique restriction sites within resistance markers.

    • Main Results:

    • The pCEM500 shuttle vector was successfully constructed and validated.
    • Dual antibiotic resistance determinants were efficiently expressed in both E. coli and B. flavum.
    • The vector demonstrated stable maintenance in B. flavum.
    • Unique restriction sites within the antibiotic resistance genes allow for DNA insertion and gene inactivation.

    Conclusions:

    • The pCEM500 shuttle vector is a functional and stable tool for genetic engineering in B. flavum.
    • This vector facilitates the transfer and cloning of genes into this industrially relevant bacterium.
    • pCEM500 offers a valuable platform for the further development of amino-acid-producing B. flavum strains.