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A nonhyperbolic kinetics of sodium potassium atpase a new viewpoints


, : A nonhyperbolic kinetics of sodium potassium atpase a new viewpoints. Biokhimiya 56(3): 494-499

The kinetics of the 130 kDa monomer obtained by treatment of duck salt gland Na,K-ATPase with C12E8 was compared with that of the membrane-bound enzyme. The shapes of the substrate-velocity curves for the membrane-bound and solubilized forms were quite different: a hyperbolic one for the monomeric Na,K-ATPase and a nonhyperbolic one for the native enzyme. A reaction scheme for ATP hydrolysis based on a comparative analysis of kinetic properties of these two forms is proposed. Experimental evidence in favour of this hypothesis is presented.

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