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Novel cloning vectors for Bacillus thuringiensis.

J A Baum1, D M Coyle, M P Gilbert

  • 1Ecogen Inc., Langhorne, Pennsylvania 19047-1810.

Applied and Environmental Microbiology
|November 1, 1990
PubMed
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New shuttle vectors were developed for Bacillus thuringiensis, enhancing genetic studies and microbial pesticide development. These stable vectors facilitate the expression of insecticidal genes, improving pest control capabilities.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Bacillus thuringiensis (Bt) is a key entomopathogen used as a microbial pesticide.
  • Genetic manipulation of Bt is crucial for enhancing its insecticidal efficacy and spectrum.
  • Development of stable and versatile genetic tools is essential for Bt research and application.

Purpose of the Study:

  • To clone and characterize replication origins from Bt plasmids.
  • To construct stable shuttle vectors for gene expression in Bt.
  • To demonstrate the utility of these vectors for producing insecticidal proteins and improving Bt strains.

Main Methods:

  • Cloning of seven replication origins from Bt plasmids into Escherichia coli.
  • Construction of three compatible shuttle vectors (pEG597, pEG853, pEG854) using selected origins.

Related Experiment Videos

  • Insertion of cryIA(c) and cryIIA insecticidal protein genes into the shuttle vectors.
  • Transformation of Bt strains and assessment of vector stability and protein production.

    • Main Results:

    • Three stable shuttle vectors (pEG597, pEG853, pEG854) were successfully constructed and demonstrated structural and segregational stability in Bt.
    • The vectors allowed for the expression of cryIA(c) and cryIIA insecticidal protein genes.
    • A recombinant Bt strain with enhanced insecticidal activity against Spodoptera exigua was developed by introducing a cloned cryIA(c) gene.

    Conclusions:

    • The developed shuttle vectors are stable and versatile tools for genetic engineering of Bacillus thuringiensis.
    • These vectors facilitate the production of insecticidal proteins and can be used to create improved Bt strains for microbial pesticides.
    • The findings support the future use of these vectors in genetic studies and the development of novel Bt-based biopesticides.