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A model for ganglioside behaviour in cell membranes.

F J Sharom, C W Grant

    Biochimica Et Biophysica Acta
    |February 21, 1978
    PubMed
    Summary

    Spin-labeled gangliosides reveal their physical behavior in membranes. These molecules interact via hydrogen bonds and are condensed by Ca2+/Mg2+ ions, influencing cell surface properties.

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    Area of Science:

    • Biophysics
    • Membrane Biology
    • Glycobiology

    Background:

    • Gangliosides are crucial glycosphingolipids in eukaryotic cell membranes.
    • Their physical behavior and interactions within membranes are not fully understood.

    Purpose of the Study:

    • To investigate the physical nature and interactions of gangliosides within lipid bilayers.
    • To explore the influence of ions and other molecules on ganglioside behavior.

    Main Methods:

    • Spin-labeling of beef brain gangliosides with different attaching groups.
    • Electron Paramagnetic Resonance (EPR) spectroscopy to study ganglioside dynamics and interactions.
    • Investigating interactions with phosphatidylcholine bilayers, Ca2+, Mg2+, glycophorin, and BHK cells.

    Main Results:

    • Ganglioside oligosaccharide chains exhibit mobility and cooperative interactions, likely through hydrogen bonding.
    • Divalent cations (Ca2+, Mg2+) condense ganglioside headgroups by complexing sialic acid residues.
    • Ionic strength has minimal effect on headgroup interactions.
    • Ganglioside headgroups do not significantly penetrate hydrophobic lipid regions.
    • Interactions with glycophorin and BHK cells suggest a role in cell surface glycocalyx formation.

    Conclusions:

    • Gangliosides possess distinct physical behaviors in membranes, driven by sugar-sugar interactions and cation binding.
    • These interactions are important for the structure and function of the cell glycocalyx.
    • Lateral mobility and clustering of carbohydrate-bearing cell surface components are predicted.

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