A0A0F6R2D8 · A0A0F6R2D8_9PHAE
- ProteinCytochrome c oxidase subunit 3
- Genecox3
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids202 (go to sequence)
- Protein existenceInferred from homology
- Annotation score2/5
Function
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.
GO annotations
all annotations | all molecular function | virus receptor activity | dna binding | rna binding | cytoskeletal motor activity | catalytic activity | gtpase activity | structural molecule activity | transporter activity | cytoskeletal protein binding | lipid binding | cyclase activity | antioxidant activity | oxidoreductase activity | transferase activity | hydrolase activity | lyase activity | isomerase activity | ligase activity | protein tag activity | cargo receptor activity | histone binding | protein folding chaperone | translation regulator activity | nutrient reservoir activity | receptor ligand activity | molecular transducer activity | molecular adaptor activity | toxin activity | cell adhesion mediator activity | molecular function regulator activity | virus coreceptor activity | catalytic activity, acting on a protein | catalytic activity, acting on dna | catalytic activity, acting on rna | molecular carrier activity | transcription regulator activity | general transcription initiation factor activity | molecular sensor activity | molecular sequestering activity | atp-dependent activity | other molecular function | all biological process | mitotic cell cycle | cytokinesis | cytoplasmic translation | immune system process | muscle system process | circulatory system process | renal system process | respiratory system process | carbohydrate metabolic process | generation of precursor metabolites and energy | dna replication | dna repair | dna recombination | chromatin organization | dna-templated transcription | regulation of dna-templated transcription | trna metabolic process | protein folding | protein glycosylation | amino acid metabolic process | modified amino acid metabolic process | lipid metabolic process | vitamin metabolic process | sulfur compound metabolic process | intracellular protein transport | nucleocytoplasmic transport | autophagy | inflammatory response | mitochondrion organization | cytoskeleton organization | microtubule-based movement | peroxisome organization | lysosome organization | chromosome segregation | cell adhesion | establishment or maintenance of cell polarity | programmed cell death | photosynthesis | mrna metabolic process | snrna metabolic process | vesicle-mediated transport | reproductive process | digestive system process | signaling | cell differentiation | protein catabolic process | extracellular matrix organization | regulatory ncrna-mediated gene silencing | telomere organization | cell junction organization | wound healing | ribosome biogenesis | cilium organization | anatomical structure development | cell motility | nervous system process | endocrine process | protein maturation | transmembrane transport | nucleobase-containing small molecule metabolic process | hepaticobiliary system process | membrane organization | protein-containing complex assembly | cell wall organization or biogenesis | nitrogen cycle metabolic process | protein localization to plasma membrane | defense response to other organism | detoxification | meiotic nuclear division | mitotic nuclear division | mitochondrial gene expression | carbohydrate derivative metabolic process | other biological process | all cellular component | nuclear chromosome | extracellular region | extracellular space | cell wall | nucleus | nuclear envelope | nucleoplasm | chromosome | nucleolus | mitochondrion | lysosome | endosome | vacuole | peroxisome | endoplasmic reticulum | golgi apparatus | lipid droplet | microtubule organizing center | cytosol | ribosome | cytoskeleton | plasma membrane | cilium | plastid | thylakoid | external encapsulating structure | extracellular matrix | cytoplasmic vesicle | organelle | other cellular component | |||
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Aspect | Term | |
---|---|---|
Cellular Component | membrane | |
Cellular Component | mitochondrion | |
Molecular Function | cytochrome-c oxidase activity | |
Biological Process | mitochondrial electron transport, cytochrome c to oxygen |
Keywords
- Molecular function
Names & Taxonomy
Protein names
- Recommended nameCytochrome c oxidase subunit 3
Gene names
Encoded on
- Mitochondrion
Organism names
- Organism
- Taxonomic lineageEukaryota > Sar > Stramenopiles > Ochrophyta > PX clade > Phaeophyceae > Dictyotales > Dictyotaceae > Lobophora
Accessions
- Primary accessionA0A0F6R2D8
Subcellular Location
UniProt Annotation
GO Annotation
Membrane ; Multi-pass membrane protein
Features
Showing features for transmembrane.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Transmembrane | 15-34 | Helical | ||||
Sequence: GGQLLILGIVTVLYVMITWW | ||||||
Transmembrane | 55-78 | Helical | ||||
Sequence: LRLGMILFIVSEVMFFFAFFWAFF | ||||||
Transmembrane | 103-127 | Helical | ||||
Sequence: WGLPLLNTILLLSSGATVTWAHHAI | ||||||
Transmembrane | 139-158 | Helical | ||||
Sequence: LYLTLTFAIYFTTFQLLEYI | ||||||
Transmembrane | 178-200 | Helical | ||||
Sequence: GFHGFHVIIGTIFLTICAIRLYL |
Keywords
- Cellular component
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Domain | 1-202 | Heme-copper oxidase subunit III family profile | ||||
Sequence: LTIGGVMFMHNYSGGGQLLILGIVTVLYVMITWWRDIIREAAFEGQHTSVVQEGLRLGMILFIVSEVMFFFAFFWAFFTSSLTPVFNIGGVWPPVGIEVISPWGLPLLNTILLLSSGATVTWAHHAIVGGLKQEAQTSLYLTLTFAIYFTTFQLLEYIKAPFSISDGVYGSTFFMATGFHGFHVIIGTIFLTICAIRLYLDH |
Sequence similarities
Belongs to the cytochrome c oxidase subunit 3 family.
Keywords
- Domain
Family and domain databases
Sequence
- Sequence statusFragment
- Length202
- Mass (Da)22,489
- Last updated2015-07-22 v1
- ChecksumB971536650545545
Features
Showing features for non-terminal residue.
Type | ID | Position(s) | Description | |||
---|---|---|---|---|---|---|
Non-terminal residue | 1 | |||||
Sequence: L | ||||||
Non-terminal residue | 202 | |||||
Sequence: H |