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The decrease of guanine nucleotides initiates sporulation of Bacillus subtilis.

J M Lopez, C L Marks, E Freese

    Biochimica Et Biophysica Acta
    |October 4, 1979
    PubMed
    Summary
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    Bacillus subtilis sporulation is triggered by a reduction in guanine nucleotides. This finding is consistent across various conditions that initiate massive sporulation in bacteria.

    Area of Science:

    • Microbiology
    • Bacterial Physiology
    • Molecular Biology

    Background:

    • Bacillus subtilis sporulation is a complex developmental process.
    • Sporulation is typically initiated by nutrient limitation.
    • Alternative pathways for sporulation induction exist.

    Purpose of the Study:

    • To investigate the role of intracellular nucleotide concentrations in Bacillus subtilis sporulation.
    • To identify the specific nucleotide changes that trigger sporulation.
    • To elucidate the signaling mechanism initiating bacterial sporulation.

    Main Methods:

    • Induction of sporulation in Bacillus subtilis under various growth conditions.
    • Measurement of intracellular nucleotide concentrations.
    • Analysis of nucleotide synthesis inhibition and purine deprivation effects.

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    Main Results:

    • Sporulation can be induced in growing cultures by inhibiting nucleotide synthesis or through purine deprivation.
    • All tested sporulation-inducing conditions led to a decrease in intracellular guanosine di- and tri-phosphates.
    • A partial reduction in guanine nucleotides, not uracil nucleotides alone, was sufficient to initiate sporulation.

    Conclusions:

    • A decrease in intracellular guanine nucleotides is a critical signal for initiating Bacillus subtilis sporulation.
    • This guanine nucleotide reduction appears to be a universal trigger for massive sporulation.
    • Understanding this mechanism provides insights into bacterial development and differentiation.