paljudest erinevatest alaühikutest koosnev valguline kompleks, mis sünteesib ADPst ja Pi-st (fosfaadist) ATPd, kasutades prootonite elektrokeemilise potentsiaali gradiendi energiat, ATP synthase is an enzyme that creates the energy storage molecule adenosine triphosphate (ATP). ATP synthase consists of two main subunits, FO and F1, which has a rotational motor mechanism allowing for ATP production. ATP is the most commonly used "energy currency" of cells for most organisms. It is formed from adenosine diphosphate (ADP) and inorganic phosphate (Pi).