Understanding and Harnessing Hydrogenases, Biological Dihydrogen Catalysts - The Metal-Driven Biogeochemistry of Gaseous Compounds in the Environment - page 101

Figure 1 How oxygenic dihydrogen metabolism at a membrane-bound hydrogenase or a cyto-
plasmic bidirectional hydrogenase is coupled to dioxygen reduction at cytochrome oxidase
contributing to the generation of a proton gradient which drives ATP synthesis in Ralstonia
eutropha . The expanded section gives more detail on how the quinone pool mediates membrane
electron transfer, where Q indicates quinone and QH 2 indicates dihydroquinone. Figure is inspired
by [ 81 ] and [ 82 ].