Аннотация:Calcium transporting ATPase performs the active transport of calcium ions across the biomembranes thereby allowing the cell to maintain low calcium concentration in the cell (10-7 M) inspite of comparatively high concentration(3ґ10-3M) of these ions outside the cell and inside intracellular vesicular depots. The main steps of the enzyme functioning are revealed and now it is clear how the energy of ATP hydrolysis is being spend to transport Ca2+.