Fig. 3
(The figure was modified from Nakagawa et al. [40])
Central metabolism and solute transport in methanogenic digester ε-Proteobacterium G1. The closest cultured relative of G1, i.e., deep-sea vent Sulfurovum sp. NBC37-1, was used for comparison. Metabolic pathways for which enzymes are not encoded in either G1 or NBC37-1 but in other deep-sea vent ε-Proteobacteria are filled in grey. IM inner membrane, OM outer membrane, Fd ferredoxin, Cyt cytochrome, H 2 ase hydrogenase, Sqr sulfide–quinone oxidoreductases, Fcc flavocytochrome c sulfide dehydrogenase, Nif nitrogen-fixing proteins, Nar membrane-bound nitrate reductase, Nap periplasmic nitrate reductase, cdNir cytochrome cd1nitrite reductase, Nor nitric oxide reductase, Nos nitrous oxide reductase, Mdh malate dehydrogenase, Sdh succinate dehydrogenase