Does the Conformation of Mg-Atpase (Spectrin-Dependent Atpase) Influence the Passive Permeability to K+?

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Abstract
The processing of human erythrocytes disclosed changes in Mg-ATPase activity following action of Pb2+ and Nile blue, and changes of permeability of K+ after treatment with Nile blue. The obtained results and those from previous papers can be summarized as follows: Substances decreasing the activity of stimulated membrane Mg-ATPase (spectrin-dependent ATPase) in red blood cells increase the passive permeability to K+, and substances increasing the stimulated Mg-ATPase activity decrease the passive permeability to K. A hypothesis is proposed that the conformation of Mg-ATPase is secondarily reflected in the state of the proper path for K+ transport through the membrane, thus the rate of passive permeability to K+ is influenced.

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