Produces ATP from ADP in the presence of a sodium ion gradient across the membrane. The alpha chain is a regulatory subunit. ATP + H2O + 4 Na(+)(in) = ADP + H(+) + 4 Na(+)(out) + phosphate Inhibited by nitrate. F-type ATPases have 2 components, CF(1) - the catalytic core - and CF(0) - the membrane proton channel. CF(1) has five subunits: alpha(3), beta(3), gamma(1), delta(1), epsilon(1). CF(0) has three main subunits: a, b and c. Belongs to the ATPase alpha/beta chains family.