ID   COX2_SOLTU              Reviewed;          26 AA.
AC   P80498;
DT   01-FEB-1996, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1996, sequence version 1.
DT   02-SEP-2026, entry version 95.
DE   RecName: Full=Cytochrome c oxidase subunit 2;
DE            EC=7.1.1.9;
DE   AltName: Full=Cytochrome c oxidase polypeptide II;
DE   Flags: Fragment;
GN   Name=COX2; Synonyms=COII, COXII;
OS   Solanum tuberosum (Potato).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   asterids; lamiids; Solanales; Solanaceae; Solanoideae; Solaneae; Solanum.
OX   NCBI_TaxID=4113;
RN   [1]
RP   PROTEIN SEQUENCE.
RC   TISSUE=Tuber;
RX   PubMed=8919912; DOI=10.1046/j.1365-313x.1996.09030357.x;
RA   Jansch L., Kruft V., Schmitz U.K., Braun H.P.;
RT   "New insights into the composition, molecular mass and stoichiometry of the
RT   protein complexes of plant mitochondria.";
RL   Plant J. 9:357-368(1996).
CC   -!- FUNCTION: Component of the cytochrome c oxidase, the last enzyme in the
CC       mitochondrial electron transport chain which drives oxidative
CC       phosphorylation. The respiratory chain contains 3 multisubunit
CC       complexes succinate dehydrogenase (complex II, CII), ubiquinol-
CC       cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III,
CC       CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to
CC       transfer electrons derived from NADH and succinate to molecular oxygen,
CC       creating an electrochemical gradient over the inner membrane that
CC       drives transmembrane transport and the ATP synthase. Cytochrome c
CC       oxidase is the component of the respiratory chain that catalyzes the
CC       reduction of oxygen to water. Electrons originating from reduced
CC       cytochrome c in the intermembrane space (IMS) are transferred via the
CC       dinuclear copper A center (CU(A)) of subunit 2 and heme A of subunit 1
CC       to the active site in subunit 1, a binuclear center (BNC) formed by
CC       heme A3 and copper B (CU(B)). The BNC reduces molecular oxygen to 2
CC       water molecules using 4 electrons from cytochrome c in the IMS and 4
CC       protons from the mitochondrial matrix. {ECO:0000250|UniProtKB:P00410}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=4 Fe(II)-[cytochrome c] + O2 + 8 H(+)(in) = 4 Fe(III)-
CC         [cytochrome c] + 2 H2O + 4 H(+)(out); Xref=Rhea:RHEA:11436,
CC         Rhea:RHEA-COMP:10350, Rhea:RHEA-COMP:14399, ChEBI:CHEBI:15377,
CC         ChEBI:CHEBI:15378, ChEBI:CHEBI:15379, ChEBI:CHEBI:29033,
CC         ChEBI:CHEBI:29034; EC=7.1.1.9;
CC         Evidence={ECO:0000250|UniProtKB:P00410};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:11437;
CC         Evidence={ECO:0000250|UniProtKB:P00410};
CC   -!- COFACTOR:
CC       Name=Cu cation; Xref=ChEBI:CHEBI:23378;
CC         Evidence={ECO:0000250|UniProtKB:P00410};
CC       Note=Binds a dinuclear copper A center per subunit.
CC       {ECO:0000250|UniProtKB:P00410};
CC   -!- SUBUNIT: Component of the cytochrome c oxidase (complex IV, CIV), a
CC       multisubunit enzyme composed of a catalytic core of 3 subunits and
CC       several supernumerary subunits. The complex exists as a monomer or a
CC       dimer and forms supercomplexes (SCs) in the inner mitochondrial
CC       membrane with ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1
CC       complex, complex III, CIII). {ECO:0000250|UniProtKB:P00410}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC       {ECO:0000250|UniProtKB:P00410}; Multi-pass membrane protein
CC       {ECO:0000250|UniProtKB:P00410}.
CC   -!- SIMILARITY: Belongs to the cytochrome c oxidase subunit 2 family.
CC       {ECO:0000305}.
CC   ---------------------------------------------------------------------------
CC   Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms
CC   Distributed under the Creative Commons Attribution (CC BY 4.0) License
CC   ---------------------------------------------------------------------------
DR   AlphaFoldDB; P80498; -.
DR   SMR; P80498; -.
DR   STRING; 4113.P80498; -.
DR   PaxDb; 4113-P80498; -.
DR   InParanoid; P80498; -.
DR   Proteomes; UP000011115; Unassembled WGS sequence.
DR   GO; GO:0005743; C:mitochondrial inner membrane; ISS:UniProtKB.
DR   GO; GO:0004129; F:cytochrome-c oxidase activity; ISS:UniProtKB.
DR   GO; GO:0022900; P:electron transport chain; IEA:InterPro.
DR   Gene3D; 1.10.287.90; -; 1.
DR   InterPro; IPR011759; Cyt_c_oxidase_su2_TM_dom.
DR   InterPro; IPR036257; Cyt_c_oxidase_su2_TM_sf.
DR   Pfam; PF02790; COX2_TM; 1.
DR   SUPFAM; SSF81464; Cytochrome c oxidase subunit II-like, transmembrane region; 1.
PE   1: Evidence at protein level;
KW   Copper; Direct protein sequencing; Electron transport; Membrane;
KW   Mitochondrion; Mitochondrion inner membrane; Reference proteome;
KW   Respiratory chain; Translocase; Transmembrane; Transport.
FT   CHAIN           1..>26
FT                   /note="Cytochrome c oxidase subunit 2"
FT                   /id="PRO_0000183692"
FT   NON_TER         26
SQ   SEQUENCE   26 AA;  2875 MW;  7D83192E6A75426B CRC64;
     DAAEPWQLGF QDAATPIMQG IIDLHH
//