Answer:
mitochondria
Step-by-step explanation:
ATP synthase is a type of respiratory mitochondrial enzyme that is located in the inner membrane.a proton gradient is created through electron transport chain in the mitochondria which leads to the production of ATP from ADP and Phosphate through phosphorylation. The process is driven by an influx in the proton on the inside leading to a concentration gradient. The protons are pumped from the positive side to the negative side generating ATP.