9hwk

Structural highlights

Function

CYOB_ECO57 Cytochrome bo(3) ubiquinol oxidase is the terminal enzyme in the aerobic respiratory chain of E.coli that predominates when cells are grown at high aeration. Catalyzes the four-electron reduction of O2 to water, using a ubiquinol as a membrane soluble electron donor for molecular oxygen reduction; ubiquinol-8 is the natural substrate for E.coli. Has proton pump activity across the membrane in addition to electron transfer, pumping 2 protons/electron and generating a proton motive force. All the redox centers of this enzyme complex are located within the largest subunit, subunit I. Protons are probably pumped via D- and K- channels found in this subunit.[UniProtKB:P0ABI8]