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. A stretch of the chloroplast genome is duplicated within chromosomes 1 and 6, resulting in the duplication of the gene. The expression of these duplicated genes (Os01g0790900 and Os06g0120500 respectively) has not been demonstrated. Belongs to the ATPase epsilon chain family.