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Plasmenylethanolamine: growth factor for cholesterol-reducing Eubacterium.

G E Mott, A W Brinkley

    Journal of Bacteriology
    |September 1, 1979
    PubMed
    Summary
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    Plasmenylethanolamine, a specific plasmalogen, is essential for the in vitro growth of Eubacterium strains that convert cholesterol to coprostanol. This lipid

    Area of Science:

    • Microbiology
    • Lipid Biochemistry

    Background:

    • Certain Eubacterium strains possess the unique ability to metabolize cholesterol into coprostanol.
    • The specific nutritional requirements for the in vitro cultivation of these cholesterol-reducing Eubacterium strains are not fully understood.

    Purpose of the Study:

    • To identify essential growth factors for cholesterol-metabolizing Eubacterium strains.
    • To investigate the role of plasmalogens in the metabolism of Eubacterium species.

    Main Methods:

    • Isolation of plasmenylethanolamine from calf brain using selective saponification and chromatographic techniques.
    • Cultivation of Eubacterium strains (ATCC 21408 and a baboon fecal isolate) in cholesterol-supplemented thioglycolate broth.
    • Supplementation of growth media with purified plasmenylethanolamine, its derivatives, or other pure lipids.

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    Main Results:

    • Plasmenylethanolamine was successfully isolated and identified as a critical growth factor.
    • Purified plasmenylethanolamine and its 2-lyso derivative significantly supported the in vitro growth of both tested Eubacterium strains.
    • Commercially sourced plasmenylethanolamine also promoted growth, while other tested lipids did not.
    • Evidence suggests metabolism of the alkenyl ether group of plasmenylethanolamine during Eubacterium growth.

    Conclusions:

    • Plasmenylethanolamine is an essential nutrient for the in vitro growth of cholesterol-reducing Eubacterium.
    • This finding highlights the specific lipid requirements for certain microbial metabolic pathways.