ATP-driven Ca(2+) ion pump involved in the maintenance of basal intracellular Ca(2+) levels at the presynaptic terminals ( , ). Uses ATP as an energy source to transport cytosolic Ca(2+) ions across the plasma membrane to the extracellular compartment (, ). May counter-transport protons, but the mechanism and the stoichiometry of this Ca(2+)/H(+) exchange remains to be established (By similarity).
Subcellular locations: Cell membrane, Presynaptic cell membrane
Localized at parallel fiber terminals.
Highly expressed in the cerebellum . Expressed in adrenal glands .