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Phospholipids from Bacillus stearothermophilus.

G L Card, C E Georgi, W E Militzer

    Journal of Bacteriology
    |January 1, 1969
    PubMed
    Summary

    Bacillus stearothermophilus lipids were analyzed, revealing phospholipids like diphosphatidyl glycerol, phosphatidyl glycerol, and phosphatidyl ethanolamine as major components. Lipid content varied with cell growth, with higher concentrations in later growth stages.

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    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Bacillus stearothermophilus is a thermophilic bacterium.
    • Understanding bacterial lipid composition is crucial for cell membrane studies.

    Purpose of the Study:

    • To characterize the lipid and phospholipid composition of Bacillus stearothermophilus strain 2184.
    • To investigate lipid distribution within different cellular fractions.

    Main Methods:

    • Lipid extraction using chloroform-methanol.
    • Chromatographic separation on silicic acid columns.
    • Identification via staining, hydrolysis products, and molar ratio analysis.
    • Cell fractionation using sonication and differential centrifugation.

    Main Results:

    • Total extractable lipid was 8% of dry cell weight, with 60-70% being phospholipid.
    • Major phospholipids identified: diphosphatidyl glycerol (23-42%), phosphatidyl glycerol (22-39%), and phosphatidyl ethanolamine (21-32%).
    • Phospholipid concentrations increased with cell age; lipid content was highest in the 105,000 x g particulate fraction (26%).

    Conclusions:

    • The study details the specific phospholipid profile of Bacillus stearothermophilus.
    • Lipid composition changes during bacterial growth and varies across cellular fractions.

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