This review is devoted to the discussion of the sizes and molecular structure of the minimal functional unit of Na, K-ATPase. Special attention is paid to the data obtained by radiation inactivation method and studies on ligand binding. The model for the stepwise radiation inactivation of Na, K-ATPase is proposed. The conclusion is drawn that Na, K-ATPase has a dimeric structure, the interactions between its alpha-subunits stabilize the quaternary structure of the pump. Functionally, each alpha-subunit in a stabilized structure possesses a full hydrolytic activity.

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