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Related Experiment Videos

Ouabain binding to phospholipid-dependent adenosine triphosphatase.

S L Goodman, K P Wheeler

    The Biochemical Journal
    |February 1, 1978
    PubMed
    Summary

    Phospholipids are crucial for ouabain binding to the sodium-potassium pump (Na+ + K+-ATPase). Reconstituting the enzyme with phosphatidylserine restored ouabain binding, highlighting the role of lipids in this process.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Membrane Protein Research

    Background:

    • The (Na+ + K+)-dependent adenosine triphosphatase, commonly known as the sodium-potassium pump, plays a vital role in cellular ion transport.
    • Phospholipids are integral components of cell membranes and are known to influence the activity and structure of membrane-bound enzymes.
    • Ouabain is a cardiac glycoside that specifically inhibits the sodium-potassium pump, making it a valuable tool for studying enzyme function.

    Purpose of the Study:

    • To investigate the specific role of phospholipids in the binding of ouabain to the (Na+ + K+)-dependent adenosine triphosphatase.
    • To determine how phospholipid removal and reconstitution affect ouabain binding kinetics and affinity.

    Main Methods:

    • Rabbit kidney enzyme preparations were treated with Lubrol WX to delipidate the (Na+ + K+)-dependent adenosine triphosphatase.
    • Reconstitution of the enzyme was achieved by adding phosphatidylserine, forming an active lipid-protein complex.
    • Ouabain binding was quantified using 3H-labelled ouabain under equilibrium conditions across a range of ouabain concentrations (0.01-1 µM).

    Main Results:

    • (Mg2+ + Pi) and (Mg2+ + ATP) promoted ouabain binding only in reconstituted enzyme samples, not in delipidated ones.
    • Sodium (Na+) presence modulated ouabain binding in a concentration-dependent manner, primarily affecting the reconstituted enzyme.
    • The reconstituted enzyme exhibited a higher affinity for Na+ compared to the delipidated enzyme, especially under conditions with (Mg2+ + ATP).

    Conclusions:

    • Phospholipids are essential for the proper functioning of the ouabain binding site on the (Na+ + K+)-dependent adenosine triphosphatase.
    • The lipid environment significantly influences the enzyme's conformational states and its interaction with ligands like ouabain and Na+.
    • Reconstitution with phosphatidylserine restores the enzyme's ability to bind ouabain, underscoring the critical role of specific lipids in enzyme activity.

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