[Na+-ATPase in the gills of bass (Dicentrarchus labrax)].
Copyright policy )[Na+-ATPase in the gills of bass (Dicentrarchus labrax)].
The authors evidence a Mg2+ dependent ATPase activity stimulated by Na+ in absence of K+ in bass gill microsomes. As this stimulated ATPase shows different features from "baseline" activity measured in the absence of both Na+ and K+ ions (Mg2+-ATPase) and from 1mM ouabain sensitive (Na+ + K+)-ATPase, it has been ascribed to a distinct Na+-ATPase. In the present paper the optimal conditions for bass gill Na+-ATPase assay and the temperature dependence of the enzyme are reported. Moreover the Na+-ATPase appears to be insensitive to 1mM ouabain and 100% inhibited by 2,5mM ethacrynic acid. It is suggested a parallel diffusion of Na+- and (Na+ + K+)-ATPase and a possible physiological role of Na+ATPase in osmoregulation.
Adenosine Triphosphatases, Gills, Ethacrynic Acid, Microsomes, Sodium, Fishes, Temperature, Animals, Ca(2+) Mg(2+)-ATPase, Ouabain, Cation Transport Proteins
Adenosine Triphosphatases, Gills, Ethacrynic Acid, Microsomes, Sodium, Fishes, Temperature, Animals, Ca(2+) Mg(2+)-ATPase, Ouabain, Cation Transport Proteins
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