Characterization of Adenosine Triphosphatase in Erythrocyte Membranes of the Cow

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Abstract
The cow red cell membrane was demonstrated to possess a Mg-dependent adenosine triphosphatase (Mg-ATPase) and a Na-K-dependent ATPase (Na-K-ATPase), the activity of which was completely abolished by the presence of ouabain. The pH optimum, the optimum Mg2+:ATP concentration ratio, the Km ATP for the enzyme, and the ouabain concentration required for inhibition of activity were similar to those of the membrane ATPase of human erythrocytes. The cow enzyme was also sensitive to the medium Na+:K+ concentration ratio. The cow red cell membrane, like that of other species, was confirmed to possess an enzyme system with the characteristics of a transport ATPase.

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