Recombinant Human Cytochrome c oxidase subunit 5A, mitochondrial (COX5A)

Uniprot Id

P20674

Target Species

Human

Target Name

COX5A

Target Full Name

Cytochrome c oxidase subunit 5A, mitochondrial

Target 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 using 4 electrons from cytochrome c in the IMS and 4 protons from the mitochondrial matrix.

Target Involvement

Mitochondrial complex IV deficiency is a rare condition caused by mutation in COX5A that lead to pulmonary arterial hypertension (PAH), failure to thrive and lactic acidemia.

Target Subcellular Location

Mitochondrion inner membrane; Peripheral membrane protein; Matrix side.

Target Protein Families

Cytochrome c oxidase subunit 5A family

Target Research Area

Metabolism

Target Synonyms

COX; COX VA; COX5A; COX5A_HUMAN; Cytochrome c oxidase polypeptide Va; Cytochrome c oxidase polypeptide; mitochondrial; Cytochrome c oxidase subunit 5A; Cytochrome c oxidase subunit 5A; mitochondrial; Cytochrome c oxidase subunit Va; mitochondrial; Mitochondrial cytochrome c oxidase subunit Va; VA

Target Background

Cytochrome c oxidase (COX) is the terminal enzyme of the mitochondrial respiratory chain. It is a multi-subunit enzyme complex that couples the transfer of electrons from cytochrome c to molecular oxygen and contributes to a proton electrochemical gradient across the inner mitochondrial membrane. The complex consists of 13 mitochondrial- and nuclear-encoded subunits. The mitochondrially-encoded subunits perform the electron transfer of proton pumping activities. The functions of the nuclear-encoded subunits are unknown but they may play a role in the regulation and assembly of the complex. This gene encodes the nuclear-encoded subunit Va of the human mitochondrial respiratory chain enzyme. A pseudogene COX5AP1 has been found in chromosome 14q22.