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Flexibility in the protoxin composition of Bacillus thuringiensis

A I Aronson1

  • 1Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907.

FEMS Microbiology Letters
|March 15, 1994
PubMed
Summary

Bacillus thuringiensis bacteria use unstable plasmids to rapidly alter their toxin genes. This plasmid instability allows bacteria to quickly change their insecticidal properties and adapt their toxicity profiles.

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Area of Science:

  • Microbiology
  • Genetics
  • Molecular Biology

Background:

  • Bacillus thuringiensis (Bt) possesses multiple protoxin genes, primarily located on plasmids.
  • These genes encode insecticidal crystal proteins (Cry proteins).
  • Plasmid composition and stability influence Bt's insecticidal activity.

Purpose of the Study:

  • To investigate the role of plasmid instability in modulating Bt's insecticidal profiles.
  • To understand how changes in protoxin gene complement affect toxicity.

Main Methods:

  • Analysis of protoxin gene distribution on plasmids in Bacillus thuringiensis subspecies.
  • Monitoring plasmid stability and maintenance mechanisms (e.g., cell mating).
  • Assessing changes in protoxin gene transcription and protein inclusion characteristics upon plasmid loss.

Main Results:

  • Specific protoxin genes, like cryIA(b), reside on unstable plasmids.
  • Loss of these plasmids is compensated by increased transcription of remaining protoxin genes.
  • Resulting protein inclusions exhibit altered insecticidal toxicity and solubility compared to parental strains.

Conclusions:

  • Plasmid instability is a key mechanism for Bacillus thuringiensis to rapidly diversify its protoxin gene repertoire.
  • This genetic plasticity allows for swift adaptation of insecticidal activity and toxicity profiles.
  • The findings highlight a dynamic evolutionary strategy in Bt for enhanced pest control efficacy.

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