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Biochemical characterization of cholesterol-reducing Eubacterium.

G E Mott, A W Brinkley, C L Mersinger

    Applied and Environmental Microbiology
    |December 1, 1980
    PubMed
    Summary
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    Two Eubacterium isolates were studied for cholesterol reduction. These bacteria utilize specific lipids and steroids, reducing them to 3 beta-ol, 5 beta-H products, indicating their metabolic capabilities.

    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Eubacterium species are known for their metabolic diversity.
    • Understanding microbial cholesterol metabolism is crucial for various biotechnological applications.

    Purpose of the Study:

    • To characterize two cholesterol-reducing Eubacterium isolates.
    • To identify specific sterols and glycerolipids that support the growth of these Eubacterium strains.

    Main Methods:

    • Conventional biochemical tests were performed.
    • Growth factor utilization (sterols and glycerolipids) was assessed.
    • Steroid reduction products were analyzed.

    Main Results:

    • Both isolates exhibited beta-glycosidase activity, hydrolyzing esculin.

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  • Growth was supported by plasmenylethanolamine and five other alkenyl ether-containing lipids.
  • Cholesterol, cholest-4-en-3-one, allocholesterol, and androst-5-en-3 beta-ol-17-one supported growth and were reduced to 3 beta-ol, 5 beta-H products.
  • Epicholesterol and 22,23-bisnor-5-cholenic acid-3-beta-ol did not support growth.

    • Conclusions:

    • The characterized Eubacterium isolates possess specific metabolic pathways for utilizing certain lipids and steroids.
    • These bacteria demonstrate a capacity for cholesterol reduction, converting specific sterols into 3 beta-ol, 5 beta-H products.