caaA, Cytochrome c oxidase polypeptide I+III
Enzyme Classification 220.127.116.11
Also Known as
COX13_THET8, caaA, ctaD
Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Subunits 1-3 form the functional core of the enzyme complex. Co I is the catalytic subunit of the enzyme. Electrons originating in cytochrome c are transferred via the copper A center of subunit 2 and heme a of subunit 1 to the bimetallic center formed by heme a3 and copper B. This cytochrome c oxidase shows proton pump activity across the membrane in addition to the electron transfer. Possibly a heterodimer of A-protein (contains: cytochrome c oxidase subunits I and III) and subunit II. The A-protein could also present a precursor form of subunits I and III.