ATP synthase subunit beta; part of the gene cluster that mediates the biosynthesis of citreoviridin, an inhibitor of the of F1-ATPase beta-subunit (PubMed:26954888). Mitochondrial membrane ATP synthase (F(1)F(0) ATP synthase or Complex V) produces ATP from ADP in the presence of a proton gradient across the membrane which is generated by electron transport complexes of the respiratory chain (By similarity). Whereas ctvA to ctvD constitute the core biosynthetic gene cluster, ctvE acts as a self-resistance gene (PubMed:26954888). ATP + 4 H(+)(in) + H2O = ADP + 5 H(+)(out) + phosphate 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). Peripheral membrane protein (By similarity). Belongs to the ATPase alpha/beta chains family.