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[Study of the interaction of Na+ and K+-ATPase of erythrocytes with ouabain. Effect of acetyl phosphate and p-nitrophenyl phosphate].

Effects of ATP, acetyl phosphate (AcP) and p-nitrophenyl phosphate (p-NPP) on the inhibition of the Na+, K+-ATPase activity were studied. ATP, AcP and p-NPP were found to facilitate the ouabain-induced inhibition of the enzyme activity only after the injection of these phosphorylyzing agents into the erythrocyte ghosts. Inside the ghosts Na+ ions enhanced the effects of the phosphorylyzing agents. K+ ions in the environment removed the stimulating effects of ATP, AcP and p-NPP on the ouabain-induced inhibition of Na+, K+-ATPase activity. It is concluded that the sites of AcP and p-NPP hydrolysis as well as the active center for ATP are localized on the inner surface of the cell membrane.