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Phospholipids as ionophores.

C A Tyson, H Vande Zande, D E Green

    The Journal of Biological Chemistry
    |March 10, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Phospholipids like cardiolipin and phosphatidic acid act as ionophores, facilitating cation transport across membranes. Their activity can be modulated, suggesting potential physiological roles in ion transport.

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    Area of Science:

    • Biochemistry
    • Membrane Biophysics
    • Lipid Chemistry

    Background:

    • Phospholipids are key components of biological membranes.
    • Ionophores are molecules that facilitate ion transport across lipid bilayers.
    • Understanding phospholipid ion transport is crucial for cell physiology.

    Purpose of the Study:

    • To investigate the ionophoretic capabilities of various phospholipids.
    • To compare phospholipid ionophore activity with known ionophores.
    • To explore factors modulating phospholipid-mediated ion translocation.

    Main Methods:

    • Direct measurement of cation translocation in a Pressman cell.
    • Utilizing an organic phase separating two aqueous phases.
    • Testing various phospholipids, including cardiolipin and phosphatidic acid.

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    Main Results:

    • Cardiolipin and phosphatidic acid exhibited significant ionophore activity, comparable to X537A for divalent cations.
    • Cardiolipin translocated monovalent and divalent cations at similar rates.
    • Modulators like butacaine, cytochrome c, ruthenium red, and lanthanum affected cardiolipin's ionophoretic activity.
    • Complexation with reduced cytochrome c enhanced ionophoretic capability of phospholipid mixtures by an order of magnitude.

    Conclusions:

    • Specific phospholipids possess potent ionophoretic properties.
    • Phospholipid ion transport is pH-independent within a physiological range.
    • Complexation with cytochrome c creates polyionophore-like properties.
    • These findings suggest a significant, previously unrecognized role for phospholipids in physiological ion transport.