The function of V-type proton pumping ATPases is basically the same as that of F-type ATPases, except that V-ATPases cannot synthesize ATP from the proton motive force, the reverse reaction of pumping. When pumping, ATP hydrolysis drives a 120 degree rotation of the rotor which leads to movement of three protons into the phagosome (Adachi et al. 2007).
Kinosita K, Jr
proton transmembrane transporter activity of V-ATPase:ATP6AP1 [endosome membrane]