Fig. 4
From: Homologous bd oxidases share the same architecture but differ in mechanism
Water densities within bd oxidase. a A chain of water molecules at the subunit interface was identified providing a proton path from the cytosol to Asp58 on CydB. Protons can be transferred from this residue to the propionate of heme d. b A density between Glu99 and Glu74 close to heme d could be caused by the substrate dioxygen or the product water. CydA is shown in dark blue, CydB in light blue and CydX in orange. Densities of water are shown as meshes
