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  • Title: Ionics and conformational transitions of Na,K-ATPase.
    Author: Grell E, Warmuth R, Lewitzki E, Ruf H.
    Journal: Acta Physiol Scand Suppl; 1992; 607():213-21. PubMed ID: 1333153.
    Abstract:
    Equilibrium binding studies have been carried out by spectrofluorometric precision titrations on FITC-Na,K-ATPase and employing the styryl dye RH-421 to obtain equilibrium constants and stoichiometric coefficients together with information related to competition between different binding equilibria. A new interpretation concerning the assignment of spectral properties and cation complex formation equilibria, as well as the involvement of conformational transitions, is suggested, based on a differentiation between selective and unselective alkali ion binding. The kinetics of K+ binding to the FITC-enzyme have been studied by employing a new microvolume technique consisting of flash photolysis of caged-K+.
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