Catalytic activity:ATP + H (2) O + Na (+) (In) + K (+) (Out) = ADP + phosphate + Na (+) (Out) + K (+) (In) . ,Function: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. ,PTM:Phosphorylation on Tyr-10 modulates pumping activity. ,similarity:Belongs to the cation transport ATPase (P-type) family. ,similarity:Belongs to the cation transport ATPase (P-type) family. Type IIC subfamily. ,subcellular location:Identified by mass spectrometry in melanosome fractions from stage I to stage IV. ,subunit:Composed of three subunits: alpha (catalytic) , beta and gamma. Binds the HLA class II histocompatibility antigen , DR1. ,
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