This magnesium-dependent enzyme catalyzes the hydrolysis of ATP coupled with the transport of sodium or lithium ions to allow salt tolerance. ATP + H2O + Na(+)(in) = ADP + H(+) + Na(+)(out) + phosphate Present with 606 molecules/cell in log phase SD medium. Belongs to the cation transport ATPase (P-type) (TC 3.A.3) family. Type IID subfamily.