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Related Experiment Videos

A membrane-associated lipomannan in micrococci.

D A Powell, M Duckworth, J Baddiley

    The Biochemical Journal
    |November 1, 1975
    PubMed
    Summary

    Micrococcus bacteria membranes contain acidic lipomannans, not lipoteichoic acids. These lipomannans, with fatty acids and glycerol, anchor the cell membrane.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Cell Biology

    Background:

    • Micrococcus species are Gram-positive bacteria.
    • Bacterial cell membranes contain various complex lipids.
    • Lipoteichoic acids are common membrane components in some Gram-positive bacteria.

    Purpose of the Study:

    • To investigate the membrane composition of Micrococcus lysodeikticus, Micrococcus flavus, and Micrococcus sodonensis.
    • To determine if lipomannans replace lipoteichoic acids in these species.
    • To characterize the structure and membrane association of these lipomannans.

    Main Methods:

    • Chemical analysis of bacterial membrane components.
    • Structural elucidation of isolated polymers.
    • Investigation of polymer-membrane interactions.

    Main Results:

    • Acidic lipomannans were identified in M. lysodeikticus, M. flavus, and M. sodonensis.
    • Lipoteichoic acids were absent in these species.
    • Lipomannans contain glycerol, fatty acids, and succinic acid, conferring hydrophobic and charged properties.
    • The M. lysodeikticus mannan structure was elucidated, showing a hexose chain linked to a lipid-rich glycerol moiety.
    • Succinic acid residues facilitate Mg2+ binding, and fatty acids anchor the lipomannan to the cytoplasmic membrane.

    Conclusions:

    • Lipomannans likely substitute for lipoteichoic acids in Micrococcus species.
    • The unique structure of these lipomannans facilitates strong association with the cytoplasmic membrane.
    • This finding provides insight into the diversity of membrane structures in Gram-positive bacteria.

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