ATP synthase epsilon chain ATPE_ENTHR F-ATPase epsilon subunit 140 atpC Produces ATP from ADP in the presence of a proton gradient across the membrane. ATP synthase F1 sector epsilon subunit MDQYLTVNVVTPDGLVYDHHAAIVVARTTAGEIGILPKHAPIIVPLTIDEVRVKRTDSDTHVDWIAVNGGIMEVRDNVVSIVADSAERERDIDVSRAERAKQRAERQIAEAKEKEDTNELKRATVALHRAINRIKVSKHS