Pathway candidateNCBI-verifiedprotein-coding

MT-CO3

cytochrome c oxidase subunit III

NCBI Gene: 4514 GeneCards UniProt: P00414

Pathway candidate — not linked to PFS or PSSD by any record here

MT-CO3 is in the library because it belongs to the mitochondria & energy family. No study, report or commentary in the corpus names it, so a variant in MT-CO3 is not, by itself, evidence of anything related to post-drug syndromes.

Gene summary

A protein-coding gene on chromosome MT (mitochondrial) (mitochondrial function and energy). Predicted to enable electron transfer activity. Predicted to contribute to cytochrome-c oxidase activity.

Source: NCBI Gene, accessed 2026-10-07.

Protein reference (UniProt)

Protein: Cytochrome c oxidase subunit 3
Function (excerpt): 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)).
Subcellular location: Mitochondrion inner membrane.
Associated conditions: Leber hereditary optic neuropathy (LHON); Mitochondrial complex IV deficiency (MT-C4D); Recurrent myoglobinuria mitochondrial (RM-MT).

Source: UniProtKB/Swiss-Prot P00414, release 2026_03, licensed CC BY 4.0. This is the protein’s normal biology, not evidence about post-drug syndromes; associated conditions are inherited disorders of the gene, not PFS, PSSD or PRSD.

Why its pathway is in the library

Mitochondrial dysfunction and oxidative stress are reported in PFS/PSSD patient work; energy failure plausibly contributes to fatigue, cognitive, and sexual symptoms.

Written for the whole mitochondria & energy family, not for MT-CO3 specifically.

Mentioned in 0 corpus records

No corpus record names MT-CO3 directly yet. It is in the library because it sits in a pathway the corpus tracks (Mitochondria & energy).

Also in mitochondrial function and energy

All 33 genes

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Protein reference (UniProt)

Protein: Cytochrome c oxidase subunit 3
Function (excerpt): 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)).
Subcellular location: Mitochondrion inner membrane.
Associated conditions: Leber hereditary optic neuropathy (LHON); Mitochondrial complex IV deficiency (MT-C4D); Recurrent myoglobinuria mitochondrial (RM-MT).