This animation of PDB 2ZXE/3B8E explains the ion transport capacity of the Sodium Potassium ATPase. The enzyme, which is present in most cells of the body, spans cellular membranes and has both extracellular and cytosolic projections.
This cellular pump (presented in this animation) is powered by ATP hydrolysis. Utilizing cellular ATP permits the passage of small cations through the pump.
For each ATP hydrolyzed, 2K+ ions move into the cell and 3 Na+ ions move out of the cell.
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