Produces ATP from ADP in the presence of a proton gradient across the membrane. The gamma chain is believed to be important in regulating ATPase activity and the flow of protons through the CF(0) complex. F-type ATPases have 2 components, CF(1) - the catalytic core - and CF(0) - the membrane proton channel. CF(1) has five subunits: alpha(3), beta(3), gamma(1), delta(1), epsilon(1). CF(0) has three main subunits: a, b and c (By similarity). In this bacterium the a and b subunits are transcribed but do not seem to be translated, thus the ATP synthase consists of the alpha, beta, gamma, delta, epsilon and c subunits. Belongs to the ATPase gamma chain family.