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Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria
12:57

Isolation and Chemical Characterization of Lipid A from Gram-negative Bacteria

Published on: September 16, 2013

Modification of cell membrane lipids in Micrococcus lysodeikticus induced by pantoyl lactone

J H Johnson, E A Grula, R Staerkel

    The Journal of Membrane Biology
    |August 21, 1980
    PubMed

    Insights

    Pantoyl lactone alters bacterial cell membrane lipids in Micrococcus lysodeikticus, affecting phospholipid composition and fatty acids. However, these altered cells maintain normal amino acid transport after washing, indicating resilience.

    Area of Science:

    • Microbiology
    • Biochemistry
    • Cell Biology

    Background:

    • Cell membrane lipid composition is crucial for bacterial function.
    • Micrococcus lysodeikticus is a model organism for studying bacterial membrane dynamics.
    • Pantoyl lactone is a known modulator of bacterial growth.

    Purpose of the Study:

    • To investigate the effects of pantoyl lactone on the cell membrane lipids of Micrococcus lysodeikticus.
    • To determine the impact of these lipid alterations on cellular transport functions.

    Main Methods:

    • Culturing Micrococcus lysodeikticus in the presence of pantoyl lactone.
    • Analyzing changes in phospholipid and fatty acid composition of cell membranes.
    • Utilizing differential scanning calorimetry to assess physical alterations in membrane structure.
    • Conducting transport assays for specific amino acids (D-alanine, L-glutamic, L-aspartic acid).

    Main Results:

    • Pantoyl lactone induced qualitative and quantitative changes in cell membrane lipids, including conversion of major phospholipids to lyso forms.
    • Significant alterations were observed in phospholipid fatty acid profiles.
    • Differential scanning calorimetry confirmed physical changes in the cell membrane.
    • While growth and transport were inhibited by pantoyl lactone, washed cells with altered membranes exhibited normal amino acid transport.

    Conclusions:

    • Pantoyl lactone significantly modifies the lipid profile and physical properties of Micrococcus lysodeikticus cell membranes.
    • Despite membrane alterations and growth inhibition, the fundamental transport mechanisms for key amino acids remain functional in the absence of pantoyl lactone.
    • This suggests a degree of resilience or adaptability in bacterial membrane transport systems.

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