Recombinant human Cytochrome c oxidase subunit 5B, mitochondrial protein

Uniprot Id

P10606

Target Species

Human

Target Name

COX5B

Target Full Name

Cytochrome c oxidase subunit 5B, 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 Subcellular Location

Mitochondrion inner membrane; Peripheral membrane protein; Matrix side.

Target Protein Families

Cytochrome c oxidase subunit 5B family

Target Research Area

Metabolism

Target Synonyms

COX 5B; COX5B; COX5B_HUMAN; COXVB; Cytochrome c oxidase polypeptide Vb; Cytochrome c oxidase polypeptide VB mitochondrial; Cytochrome c oxidase subunit 5B; Cytochrome c oxidase subunit 5B mitochondrial; Cytochrome c oxidase subunit Vb; mitochondrial

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 and 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 Vb of the human mitochondrial respiratory chain enzyme.