A multisubunit ATPase transporter found in some halophilic or alkalophilic bacteria that functions in maintaining sodium homeostasis. The enzyme is similar to EC
7.1.2.2 (H+-transporting two-sector ATPase) but pumps Na+ rather than H+. By analogy to EC
7.1.2.2, it is likely that the enzyme pumps 4 sodium ions for every ATP molecule that is hydrolysed. cf. EC
7.2.2.3, P-type Na+ transporter and EC
7.2.2.4, ABC-type Na+ transporter.