Effects of Taurine on the ATPase Activity in the Human Erythrocyte Membrane

Abstract
Effects of taurine on the total ATPase activity inhibited by ouabain were investigated in the human erythrocyte membrane. The enzyme activity was not activated by taurine in the absence of Ca, but was significantly activated by taurine (15-60 mM) in the presence of Ca (5 mM) by which the enzyme is inhibited. Since taurine does not form a chelate complex with Ca2+, this activation may be due to an action of taurine in the presence of Ca through competition with these ions on the membrane.

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