This is the catalytic component of the active enzyme, which catalyzes the hydrolysis of ATP coupled with the exchange of sodium and potassium ions across the plasma membrane. This action creates the electrochemical gradient of sodium and potassium ions, providing the energy for active transport of various nutrients.
Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IIC subfamily.
Phosphorylation on Tyr-10 modulates pumping activity.
Cell membrane. Melanosome. Identified by mass spectrometry in melanosome fractions from stage I to stage IV.