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Published on: September 17, 2016

Regulation and self-inhibition of Microsporum gypseum Macroconidia germination

W J Page, J J Stock

    Journal of Bacteriology
    |October 1, 1971
    PubMed

    Insights

    Microsporum gypseum macroconidia germination is regulated by alkaline protease and inorganic phosphate release. Phosphate accumulation inhibits protease activity, controlling fungal growth.

    Area of Science:

    • Medical Mycology
    • Fungal Physiology
    • Biochemistry

    Background:

    • Microsporum gypseum is a dermatophyte causing superficial fungal infections.
    • Fungal spore germination is a critical process for infection establishment and requires precise regulation.
    • Understanding germination regulation is key to developing antifungal strategies.

    Purpose of the Study:

    • To investigate the regulatory mechanisms governing Microsporum gypseum macroconidia germination.
    • To identify key molecules involved in the control of germination rate and extent.
    • To elucidate the role of alkaline protease and inorganic phosphate in germination.

    Main Methods:

    • Monitoring macroconidia germination rates and morphological changes over time.
    • Quantifying the release of alkaline protease, calcium ions, and inorganic phosphate.
    • Analyzing the interaction between released substances and their effect on germination.
    • Utilizing a germination-defective mutant strain to study specific regulatory pathways.
    • Supplementing mutant cultures with calcium ions to assess its protective effects.

    Main Results:

    • Macroconidia germination released alkaline protease, calcium ions, and inorganic phosphate.
    • Germination rate peaked early and declined as inorganic phosphate accumulated.
    • Inorganic phosphate interacted with and inactivated alkaline protease, reducing germination.
    • Spore density influenced germination via the phosphate-to-protease ratio.
    • A mutant strain exhibited excessive phosphate release and failed to germinate properly.
    • Calcium ions stabilized mutant macroconidia, prevented protease inactivation, and restored germination.

    Conclusions:

    • Macroconidia germination is regulated by the release of inorganic phosphate, which inhibits alkaline protease.
    • The ratio of phosphate to protease is a critical factor in controlling germination percentage.
    • Calcium ions play a protective role, stabilizing spores and maintaining protease activity.
    • These findings offer insights into novel targets for antifungal therapies against Microsporum infections.

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