Search Results
Overview
| Uniprot ID | P13073 |
|---|---|
| Protein Name | Cytochrome c oxidase subunit 4 isoform 1, mitochondrial |
| Gene Name | COX4I1 |
| Organism | Homo sapiens |
Kla Sites from experimental identification
| Position | Flanking peptide |
|---|---|
| 149 | TKRMLDMKVNPIQGL |
| 29 | RAHESVVKSEDFSLP |
| 53 | LPEVAHVKHLSASQK |
| 60 | KHLSASQKALKEKEK |
| 67 | KALKEKEKASWSSLS |
| 87 | ELYRIKFKESFAEMN |
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
Protein Sequence
Gene Ontology
| Classification | GO ID | Description |
|---|---|---|
| Cellular Component | GO:0005829 | cytosol |
| Cellular Component | GO:0016020 | membrane |
| Cellular Component | GO:0005743 | mitochondrial inner membrane |
| Cellular Component | GO:0005758 | mitochondrial intermembrane space |
| Cellular Component | GO:0031966 | mitochondrial membrane |
| Cellular Component | GO:0005739 | mitochondrion |
| Cellular Component | GO:0045277 | respiratory chain complex IV |
| Molecular Function | GO:0004129 | cytochrome-c oxidase activity |
| Biological Process | GO:0045333 | cellular respiration |
| Biological Process | GO:0006091 | generation of precursor metabolites and energy |
| Biological Process | GO:0006123 | mitochondrial electron transport, cytochrome c to oxygen |
| Biological Process | GO:0007584 | response to nutrient |
Reference
[1] Yang Z, Yan C, Ma J, Peng P, Ren X et al.. Lactylome analysis suggests lactylation-dependent mechanisms of metabolic adaptation in hepatocellular carcinoma.. Nat Metab 5(1):61-79. 2023 Jan. PMID: 36593272.
[2] Yang YH, Wang QC, Kong J, Yang JT, Liu JF. Global profiling of lysine lactylation in human lungs.. Proteomics 23(15):e2200437. 2023 Aug. PMID: 37170646.
[3] Shi CM, Wang QC, Li XL, Yang YH, Tang XY et al.. Global Profiling of Protein Lactylation in Human Hippocampi.. Proteomics Clin Appl 19(2):e202400061. 2025 Mar. PMID: 39610256.
[4] He J, Lai T, Zhou Z, Yang H, Lei Z et al.. Multiomics profiling reveals the involvement of protein lactylation in nonhomologous end joining pathway conferring radioresistance in lung adenocarcinoma cell.. Sci Rep 15(1):24651. 2025 Jul 9. PMID: 40634431.
[5] Wu Q, Li Z, Gong T, Zheng X, Zhou X et al.. Porphyromonas gingivalis infection induces lysine lactylation reprogramming in human umbilical vein endothelial cells.. Front Cell Infect Microbiol 16:1706727. 2026. PMID: 41696360.