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. Author manuscript; available in PMC: 2022 Jun 13.
Published in final edited form as: Nat Rev Microbiol. 2021 Jun 28;19(12):774–785. doi: 10.1038/s41579-021-00583-y

Fig. 2. O2-dependent respiration in anaerobes.

Fig. 2

Two types of oxygen (O2)-directed respiration are found in anaerobes. The membrane-bound cytochrome bd oxidase (Cyd) receives electrons from menaquinone (MQ) and upstream dehydrogenases; and the soluble rubredoxin:oxygen oxidoreductase (ROO) obtains electrons from reduced rubredoxin. NDH, NADH dehydrogenase; NROR, NADH:rubredoxin oxidoreductase; Rd, rubredoxin.