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Related Experiment Videos

Potassium binding to the (Na+ + K+)-ATPase.

D Hastings, J C Skou

    Biochimica Et Biophysica Acta
    |September 18, 1980
    PubMed
    Summary

    The study quantified potassium (K+) binding to the sodium-potassium pump ((Na+ + K+)-ATPase), finding 5.1 K+ ions bound per site. Ion concentration significantly influenced K+ binding affinity and selectivity.

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    Area of Science:

    • Biochemistry
    • Membrane Transport
    • Ion Pumps

    Background:

    • The (Na+ + K+)-ATPase is a crucial ion pump in cell membranes.
    • Understanding ion binding is essential for elucidating pump function.

    Purpose of the Study:

    • To quantify the number of potassium (K+) ions bound to the (Na+ + K+)-ATPase.
    • To determine the binding affinity (K'D) for K+ and sodium (Na+) under varying ionic conditions.

    Main Methods:

    • Differential-titration technique used to measure ion binding.
    • Equilibrium conditions were maintained throughout the experiments.

    Main Results:

    • 5.1 K+ ions were found to bind per 32P-labelling site.
    • K+ binding affinity (K'D) was influenced by choline and Na+ concentrations.
    • Calculated K+ : choline selectivity was 2564:1 and K+ : Na+ selectivity was 54:1.

    Conclusions:

    • The (Na+ + K+)-ATPase exhibits specific binding for K+ ions.
    • Ionic strength and the presence of other ions (Na+, ATP) modulate K+ binding affinity.

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