COX6A2
COX6A2 (Cytochrome C Oxidase Subunit 6A2) is a Protein Coding gene.
Full Name
Cytochrome C Oxidase Subunit 6A2
Function
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 subunit 2 and heme A of subunit 1 to the active site in subunit 1, a binuclear center (BNC) formed by heme A3 and copper B (CU(B)). The BNC reduces molecular oxygen to 2 water molecules unsing 4 electrons from cytochrome c in the IMS and 4 protons from the mitochondrial matrix. Plays a role in the assembly and stabilization of complex IV (PubMed:31155743).
Biological Process
Generation of precursor metabolites and energy Source: ProtInc
Mitochondrial electron transport, cytochrome c to oxygen Source: GO_Central
Cellular Location
Mitochondrion inner membrane
Involvement in disease
Mitochondrial complex IV deficiency, nuclear type 18 (MC4DN18):
An autosomal recessive, muscle-specific, mitochondrial disorder with onset in infancy. MC4DN18 is characterized by hypotonia, limb and facial muscle weakness, and high arched palate. Some patients have respiratory insufficiency at birth and cardiomyopathy. Patient skeletal muscle shows decreased levels and activity of mitochondrial respiratory complex IV.
Topology
Mitochondrial matrix: 13-24
Helical: 25-49
Mitochondrial intermembrane: 50-97