Produces ATP from ADP in the presence of a proton gradient across the membrane. 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. Induced by a decrease in external pH from 7.5 to 5.7. Belongs to the ATPase epsilon chain family.