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Proposed peroxidase-like activity of cytochrome bd-I from E. coli. Shown is the scheme for the enzyme arrangement in the E. coli membrane bilayer based on the solved bd-I structure [28,29]. The oxidase consists of four different subunits, CydA, CydB, CydX, and CydH. CydA carries three hemes (b558, b595, d) and the quinol binding site at which the electron donor dQH2) is likely bound.
