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Related Experiment Videos

Uncoupling the red cell sodium pump by proteolysis.

W J Harvey, R Blostein

    The Journal of Biological Chemistry
    |February 5, 1986
    PubMed
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    Proteolysis of the sodium-potassium pump (Na,K-ATPase) uncouples ion transport from ATP hydrolysis. Specific enzyme cleavage alters the reaction sequence, impacting ion binding and release.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Membrane Transport

    Background:

    • The Na,K-ATPase is a crucial transmembrane protein responsible for maintaining electrochemical gradients.
    • Understanding the enzyme's reaction mechanism and conformational changes is vital for cellular function.

    Purpose of the Study:

    • To investigate the effects of in situ proteolysis on Na,K-ATPase activity and its reaction mechanism.
    • To determine if specific enzyme cleavage uncouples cation translocation from ATP hydrolysis.

    Main Methods:

    • Utilized inside-out red cell membrane vesicles to study Na,K-ATPase.
    • Employed trypsin and chymotrypsin for in situ proteolysis.
    • Assessed enzyme activity by measuring cation translocation (22Na+ influx, Na+/K+ exchange) and ATP hydrolysis (Na-ATPase, (Na+ + K+)-activated ATPase).

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    Main Results:

    • Proteolysis inactivated cation translocation more significantly than ATP hydrolysis.
    • This uncoupling effect was observed in both Na-ATPase and Na+/K+ exchange assays.
    • Oligomycin and thimerosal inhibited conformational steps but did not cause uncoupling.

    Conclusions:

    • Specific cleavage sites on Na,K-ATPase alter the normal reaction sequence.
    • Ion binding and release occur without complete conformational transitions post-cleavage.
    • Trypsinized Na,K-ATPase shows K+-stimulated hydrolytic activity, supporting altered reaction kinetics.