FEATURES

FAMILY

DESCRIPTION

Also known as COX5A_YEAST, COX5A. Component of the cytochrome c oxidase, the last enzyme in the mitochondrial electron transport chain which drives oxidative phosphorylation. The respiratory chain contains 3 multisubunit complexes succinate dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to transfer electrons derived from NADH and succinate to molecular oxygen, creating an electrochemical gradient over the inner membrane that drives transmembrane transport and the ATP synthase. Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Electrons originating from reduced cytochrome c in the intermembrane space (IMS) are transferred via the dinuclear copper A center (CU(A)) of COX2 and heme A of COX1 to the active site in COX1, a binuclear center (BNC) formed by heme A3 and copper B (CU(B)). The BNC reduces molecular oxygen to 2 water molecules using 4 electrons from cytochrome c in the IMS and 4 protons from the mitochondrial matrix. Component of the cytochrome c oxidase (complex IV, CIV), a multisubunit enzyme composed of 12 subunits. The complex is composed of a catalytic core of 3 subunits COX1, COX2 and COX3, encoded in the mitochondrial DNA, and 9 supernumerary subunits COX4, COX5A (or COX5B), COX6, COX7, COX8, COX9, COX12, COX13 and COX26, which are encoded in the nuclear genome (PubMed:7851399, PubMed:30598556, PubMed:30598554). COX5A is the predominant subunit V during aerobic/normoxic growth, it gets replaced by COX5B under anaerobic/hypoxic conditions (PubMed:2546055). The complex exists as a monomer or a dimer and forms supercomplexes (SCs) in the inner mitochondrial membrane with a dimer of ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII), resulting in 2 different assemblies (supercomplexes III(2)IV and III(2)IV(2)) (PubMed:10775262, PubMed:10764779, PubMed:30598556, PubMed:30598554). COX5A interacts with COR1, CYT1 and QCR6 at the CIII-CIV interface (PubMed:30598556, PubMed:30598554).

EXTERNAL LINKS

COX5A

Cytochrome c oxidase subunit 5A, mitochondrial

COX5A

Molecular Synopsis