| HGNC Family | Mitochondrial respiratory chain complexes |
| Name | cytochrome c oxidase subunit I |
| Description | Contributes to cytochrome-c oxidase activity. Predicted to be involved in aerobic respiration; positive regulation of vasoconstriction; and respiratory electron transport chain. Located in mitochondrion. Part of mitochondrial membrane and respiratory chain complex IV. [provided by Alliance of Genome Resources, Mar 2025] |
| Summary |
{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nMitochondrial cytochrome‐c oxidase subunit 1 (MT‐CO1) is the principal mitochondrially encoded catalytic core of complex IV of the respiratory chain. It is responsible for accepting electrons from cytochrome c and for helping to pump protons across the inner mitochondrial membrane—a process that generates the electrochemical gradient necessary for ATP synthesis. Proper incorporation of MT‐CO1 into the holoenzyme requires a coordinated assembly with both its nuclear‐encoded partner subunits and several dedicated assembly factors; any disturbances in these interactions or in the biogenic pathway can compromise electron transfer and cellular energy production (see, for example."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its central role in oxidative phosphorylation, MT‐CO1 is subject to tight regulation by intracellular signaling and post‐translational modifications. For instance, exposure to pro‐inflammatory factors like tumor necrosis factor α (TNFα) induces tyrosine phosphorylation of MT‐CO1—modifying enzyme activity and reducing ATP output—which, in turn, makes cells susceptible to energy paucity. MT‐CO1 also interacts with various macromolecules such as amyloid‐β peptides and redox regulators, thereby modulating its function and the formation of respiratory supercomplexes. Mutations and deleterious sequence variations in the MT‐CO1 gene—from missense and truncating mutations to large rearrangements—have been linked to a wide range of pathologies including neurodegenerative disorders, cardiac dysfunction from carbon monoxide poisoning, certain cancers, sensorineural hearing loss, reproductive defects, and sepsis. Moreover, studies have linked decreased MT‐CO1 gene amplification with cognitive impairment as observed in Alzheimer’s disease, while other reports highlight that mutation‐triggered deregulation elevates reactive oxygen species and perturbs apoptotic pathways. Collectively, these findings demonstrate that both quantitative and qualitative changes in MT‐CO1 critically influence mitochondrial respiration and cellular homeostasis (e.g.."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "5", "end_ref": "31"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAlterations in MT‐CO1 expression and sequence integrity not only disrupt mitochondrial bioenergetics but also serve as valuable indicators for disease progression and therapeutic response. Changes in transcript and protein levels upon exposure to regulatory cytokines (such as TGFβ) and during aging can influence overall electron transport efficiency and redox balance. Furthermore, the analysis of MT‐CO1 alterations has prognostic significance in several clinical settings, including endometrial and colorectal cancers, as well as in neurological, cardiovascular, and metabolic disorders. These observations underscore the importance of maintaining MT‐CO1 functionality for cellular homeostasis and highlight its potential as a biomarker for mitochondrial dysfunction in diverse human diseases (e.g.."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "32", "end_ref": "39"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Siôn L Williams, Isabelle Valnot, Pierre Rustin, et al. 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| Synonyms | COX1, COI, MTCO1 |
| Proteins | COX1_HUMAN |
| NCBI Gene ID | 4512 |
| API | |
| Download Associations | |
| Predicted Functions |
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| Co-expressed Genes |
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| Expression in Tissues and Cell Lines |
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MT-CO1 has 58 functional associations with biological entities spanning 1 categories (chemical) extracted from 1 datasets.
Click the + buttons to view associations for MT-CO1 from the datasets below.
If available, associations are ranked by standardized value
| Dataset | Summary | |
|---|---|---|
| DeepCoverMOA Drug Mechanisms of Action | small molecule perturbations with high or low expression of MT-CO1 protein relative to other small molecule perturbations from the DeepCoverMOA Drug Mechanisms of Action dataset. | |