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Related Experiment Videos

Bacillus thuringiensis: from biodiversity to biotechnology

D L Prieto-Samsónov1, R I Vázquez-Padrón, C Ayra-Pardo

  • 1Laboratory of Environmental Biotechnology, Centre for Genetic Engineering and Biotechnology (CIGB), Havana, Cuba.

Journal of Industrial Microbiology & Biotechnology
|January 7, 1998
PubMed
Summary

Bacillus thuringiensis bacteria produce crystal proteins (Cry and Cyt) toxic to invertebrates, used as biopesticides. Expressing these toxin genes in plants offers effective crop protection.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Agricultural Science

Background:

  • Bacillus thuringiensis (Bt) is a Gram-positive bacterium utilized globally as a biological pesticide.
  • Its insecticidal properties stem from parasporal protein inclusions, known as crystals.
  • These crystals contain delta-endotoxins, specifically Cry and Cyt proteins, which exhibit toxicity towards various invertebrate species.

Purpose of the Study:

  • To summarize the properties and applications of Bacillus thuringiensis crystal proteins.
  • To discuss the mode of action of Cry proteins against insect pests.
  • To highlight the potential of cry gene expression in transgenic plants for crop protection.

Main Methods:

  • Review of existing literature on Bacillus thuringiensis and its delta-endotoxins.

Related Experiment Videos

  • Analysis of the biochemical composition and mode of action of Cry and Cyt proteins.
  • Examination of studies involving the expression of cry genes in heterologous systems, including plants.

    • Main Results:

    • Bacillus thuringiensis crystal proteins are selectively toxic to arthropods, nematodes, flatworms, and protozoa.
    • The insecticidal mechanism involves the binding of activated Cry toxins to specific receptors in the insect midgut, leading to cell lysis.
    • The cry genes have been successfully expressed in various organisms, demonstrating their potential for genetic engineering.

    Conclusions:

    • Bacillus thuringiensis offers a safe and effective biological control agent for agriculture.
    • Understanding the mode of action of Cry proteins is crucial for optimizing their efficacy.
    • Transgenic expression of cry genes in plants represents a significant advancement in sustainable crop protection strategies.