ATP Synthase is a large protein structure that converts ADP to ATP. The engine drives the formation of fuel for the cells of the body. By using an electrical gradient, this machine crushes the ADP with another phosphate molecule to the ADP. This machine is quite remarkable. It spins and has an axle. Along with a retaining ring to keep it in place. This is the slow motion of this machine. The real thing spins at 21,000 RPM. It spins as fast as a Formula 1 engine. It matches the rotation of the fastest car on earth.