Fig. 5
From: Homologous bd oxidases share the same architecture but differ in mechanism
E. coli bd oxidase features a Q-8 binding site in CydB that has a stabilizing function. a Ubiquinone-8 (shown as sticks) binds to subunit CydB (light blue). It deeply inserts into CydB, involving six TM helices in binding. b A superposition of CydA and CydB shows that in CydB, ubiquinone-8 follows the trace of the heme positions in CydA
