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Bio-energetics Investigation of Candida albicans Using Real-time Extracellular Flux Analysis
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The role of metabolic energy in the lethal action of basic proteins on Candida albicans

V L Olson, R L Hansing, D O McClary

    Canadian Journal of Microbiology
    |February 1, 1977
    PubMed

    Insights

    Basic proteins are less destructive to respiration-impaired Candida albicans. Impairing cellular respiration, through mutation or chemical uncouplers, reduces yeast cell vulnerability to these proteins, suggesting metabolic energy

    Area of Science:

    • Microbiology
    • Biochemistry
    • Cell Biology

    Background:

    • Basic proteins can exert destructive effects on microbial cells.
    • Candida albicans is a common opportunistic fungal pathogen.
    • Cellular respiration is crucial for yeast energy production and survival.

    Purpose of the Study:

    • To investigate the destructive effects of basic proteins on Candida albicans.
    • To compare the susceptibility of wild-type Candida albicans to respiration-impaired mutants when exposed to basic proteins.
    • To elucidate the role of metabolic energy in the destructive action of basic proteins on yeast cells.

    Main Methods:

    • Comparative analysis of basic protein effects on wild-type Candida albicans and its respiration-impaired mutants.
    • Direct plate counts to determine survivor numbers.
    • Quantitative ultraviolet spectrophotometry to measure released cellular constituents.
    • Assessment of basic protein effects in the presence of oxidative phosphorylation uncouplers (sodium azide, 2,4-dinitrophenol, salicylanide).

    Main Results:

    • Respiration-impaired Candida albicans mutants exhibited reduced vulnerability to basic proteins compared to wild-type cells.
    • The presence of oxidative phosphorylation uncouplers significantly decreased the lethal effects and release of cellular substances from wild-type cells.
    • Effects observed with uncouplers on wild-type cells were comparable to those on untreated oxidative phosphorylation mutants.

    Conclusions:

    • Impairment of the respiratory system, either through mutation or chemical intervention, enhances yeast cell resistance to basic proteins.
    • Metabolic energy derived from cellular respiration plays a significant role in the destructive action of basic proteins on yeast cells.
    • These findings highlight the importance of cellular energy status in antifungal protein interactions.

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