Protein: Cytochrome c oxidase subunit 9, mitochondrial (O94705)
Organism: Schizosaccharomyces pombe (strain 972 / ATCC 24843) (Fission yeast)
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
Subcellular location: Mitochondrion inner membrane ; Single-pass membrane protein
InterPro domains:
- IPR014368: Cytochrome c oxidase, subunit VIIa, fungal (family) [1-58]
Sequence:
MAVGPVTGMFKRRIVTDFSVTMILGTLGACYWWFGYHKPAARQREEFYVKLAAEKNAE
Predicted GO terms:
Molecular Function (MF): GO:0003674 (molecular function), GO:0003824 (catalytic activity), GO:0005215 (transporter activity), GO:0022857 (transmembrane transporter activity), GO:0016491 (oxidoreductase activity), GO:0009055 (electron transfer activity), GO:0015075 (monoatomic ion transmembrane transporter activity), GO:0015318 (inorganic molecular entity transmembrane transporter activity), GO:0016675 (oxidoreductase activity, acting on a heme group of donors), GO:0022804 (active transmembrane transporter activity), GO:0015399 (primary active transmembrane transporter activity), GO:0022890 (inorganic cation transmembrane transporter activity), GO:0022853 (active monoatomic ion transmembrane transporter activity), GO:0004129 (cytochrome-c oxidase activity), GO:0008324 (monoatomic cation transmembrane transporter activity), GO:0015453 (oxidoreduction-driven active transmembrane transporter activity), GO:0015078 (proton transmembrane transporter activity)
Biological Process (BP): GO:0008150 (biological process), GO:0008152 (metabolic process), GO:0009987 (cellular process), GO:0044237 (cellular metabolic process), GO:0006091 (generation of precursor metabolites and energy), GO:0015980 (energy derivation by oxidation of organic compounds), GO:0022900 (electron transport chain), GO:0022904 (respiratory electron transport chain), GO:0045333 (cellular respiration), GO:0019646 (aerobic electron transport chain), GO:0009060 (aerobic respiration), GO:0042773 (ATP synthesis coupled electron transport), GO:0006123 (mitochondrial electron transport, cytochrome c to oxygen), GO:0042775 (mitochondrial ATP synthesis coupled electron transport), GO:0006119 (oxidative phosphorylation)
Cellular Component (CC): GO:0005575 (cellular component), GO:0110165 (cellular anatomical entity), GO:0005622 (intracellular anatomical structure), GO:0043226 (organelle), GO:0005737 (cytoplasm), GO:0043229 (intracellular organelle), GO:0005739 (mitochondrion), GO:0043227 (membrane-bounded organelle), GO:0043231 (intracellular membrane-bounded organelle)