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Carotenoid formation by Staphylococcus aureus.

R K Hammond, D C White

    Journal of Bacteriology
    |July 1, 1970
    PubMed
    Summary
    This summary is machine-generated.

    Staphylococcus aureus synthesizes various carotenoids, with polar, hydroxylated forms increasing significantly during aerobic growth. Carotenoid synthesis involves sequential desaturation and hydroxylation, independent of light.

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    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Staphylococcus aureus is a common bacterium.
    • Carotenoids are pigments with potential health benefits.
    • Understanding bacterial pigment synthesis is crucial for microbial research.

    Purpose of the Study:

    • To identify and characterize the carotenoid pigments produced by Staphylococcus aureus U-71.
    • To investigate the influence of growth conditions (aerobic vs. anaerobic, light) on carotenoid synthesis.
    • To elucidate the metabolic pathway of carotenoid formation in this bacterium.

    Main Methods:

    • Extraction and saponification of bacterial pigments.
    • Chromatographic separation and spectral analysis for pigment identification.
    • Radioactive labeling with mevalonate-2-(14)C to study synthesis and turnover.

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    Main Results:

    • Identified phytoene, zeta-carotene, delta-carotene, phytofluenol, rubixanthin, and related compounds.
    • Total carotenoids increased significantly under aerobic conditions (45 to 1,000 nmoles/g dry weight), especially polar, hydroxylated forms.
    • Anaerobic growth resulted in lower total carotenoid production (20 to 80 nmoles/g dry weight) with minimal polar carotenoids.
    • Light had no discernible effect on carotenoid synthesis.
    • Radioactive labeling confirmed sequential desaturation and hydroxylation pathways, with stable incorporation and turnover.

    Conclusions:

    • Staphylococcus aureus U-71 produces a diverse range of carotenoids.
    • Aerobic conditions strongly favor the synthesis of polar, hydroxylated carotenoids.
    • Carotenoid biosynthesis involves sequential enzymatic modifications of carotene precursors.
    • The identified carotenoids are synthesized via a pathway involving desaturation and hydroxylation, utilizing mevalonate as a precursor.