A multisubunit ATPase transporter found in some halophilic or alkalophilic bacteria that functions in maintaining sodium homeostasis. The enzyme is similar to EC 220.127.116.11
(H+-transporting two-sector ATPase) but pumps Na+ rather than H+. By analogy to EC 18.104.22.168
, it is likely that the enzyme pumps 4 sodium ions for every ATP molecule that is hydrolysed. cf. EC 22.214.171.124
, P-type Na+ transporter and EC 126.96.36.199
, ABC-type Na+ transporter.