Produces ATP from ADP in the presence of a proton gradient across the membrane. F-ATPase epsilon subunit ATP synthase epsilon chain, chloroplastic atpE ATP synthase F1 sector epsilon subunit ATPE_HORVU 137 MKLNLYVLTPKRIIWDCEVKEIILSTNSGQIGVLPNHAPINTAVDMGPLRIRLLNDQWLTAVLWSGFARIVNNEIIILGNDAELGSDIDPEEAQKALEIAEANLSKAEGTKDLVEAKLALRRARIRIEAVNWIPPSN