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Metalloprotease from Bacillus thuringiensis.

E Li, A A Yousten

    Applied Microbiology
    |September 1, 1975
    PubMed
    Summary
    This summary is machine-generated.

    Bacillus thuringiensis var. kurstaki produces an extracellular protease during sporulation. This enzyme

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    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Bacillus thuringiensis var. kurstaki is a bacterium known for its insecticidal properties.
    • Protease production is a key factor in the life cycle and ecological role of many bacteria.

    Purpose of the Study:

    • To investigate the production and characteristics of an extracellular protease from Bacillus thuringiensis var. kurstaki.
    • To determine the factors influencing protease production and stability.

    Main Methods:

    • Culturing Bacillus thuringiensis var. kurstaki in nutrient broth.
    • Assessing protease activity under varying conditions.
    • Investigating the role of metal ions (Mn2+, Ca2+) in protease production and stability.

    Main Results:

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  • An extracellular, metal chelator-sensitive protease was identified during early sporulation.
  • Protease production was enhanced by manganese (Mn2+) or calcium (Ca2+) supplementation.
  • Calcium (Ca2+) was essential for maintaining enzyme stability.

    • Conclusions:

    • Bacillus thuringiensis var. kurstaki synthesizes a unique extracellular protease.
    • Metal ions, particularly calcium, play a critical role in the regulation and stability of this protease.
    • Understanding these factors can provide insights into bacterial sporulation and enzyme function.