ID   COX1_TRYBB              Reviewed;         549 AA.
AC   P04371;
DT   20-MAR-1987, integrated into UniProtKB/Swiss-Prot.
DT   20-MAR-1987, sequence version 1.
DT   22-FEB-2023, entry version 111.
DE   RecName: Full=Cytochrome c oxidase subunit 1;
DE            EC=7.1.1.9;
DE   AltName: Full=Cytochrome c oxidase polypeptide I;
GN   Name=COXI; Synonyms=COI;
OS   Trypanosoma brucei brucei.
OG   Mitochondrion.
OC   Eukaryota; Discoba; Euglenozoa; Kinetoplastea; Metakinetoplastina;
OC   Trypanosomatida; Trypanosomatidae; Trypanosoma.
OX   NCBI_TaxID=5702;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=6093040; DOI=10.1093/nar/12.19.7327;
RA   Hensgens L.A.M., Brakenhoff J., de Vries B.F., Sloof P., Tromp M.C.,
RA   van Boom J.H., Benne R.;
RT   "The sequence of the gene for cytochrome c oxidase subunit I, a frameshift
RT   containing gene for cytochrome c oxidase subunit II and seven unassigned
RT   reading frames in Trypanosoma brucei mitochondrial maxi-circle DNA.";
RL   Nucleic Acids Res. 12:7327-7344(1984).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 1-402.
RC   STRAIN=EATRO 164;
RX   PubMed=2989684; DOI=10.1016/0166-6851(85)90117-3;
RA   Payne M., Rothwell V., Jasmer D.P., Feagin J.E., Stuart K.;
RT   "Identification of mitochondrial genes in Trypanosoma brucei and homology
RT   to cytochrome c oxidase II in two different reading frames.";
RL   Mol. Biochem. Parasitol. 15:159-170(1985).
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:P00401}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=4 Fe(II)-[cytochrome c] + 8 H(+)(in) + O2 = 4 Fe(III)-
CC         [cytochrome c] + 4 H(+)(out) + 2 H2O; 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:P00401};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:11437;
CC         Evidence={ECO:0000250|UniProtKB:P00401};
CC   -!- COFACTOR:
CC       Name=heme; Xref=ChEBI:CHEBI:30413;
CC         Evidence={ECO:0000250|UniProtKB:P00401};
CC       Note=Binds 2 heme A groups non-covalently per subunit.
CC       {ECO:0000250|UniProtKB:P00401};
CC   -!- COFACTOR:
CC       Name=Cu cation; Xref=ChEBI:CHEBI:23378;
CC         Evidence={ECO:0000250|UniProtKB:P00401};
CC       Note=Binds a copper B center. {ECO:0000250|UniProtKB:P00401};
CC   -!- PATHWAY: Energy metabolism; oxidative phosphorylation.
CC       {ECO:0000250|UniProtKB:P00401}.
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:P00401}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC       {ECO:0000250|UniProtKB:P00401}; Multi-pass membrane protein
CC       {ECO:0000250|UniProtKB:P00401}.
CC   -!- SIMILARITY: Belongs to the heme-copper respiratory oxidase family.
CC       {ECO:0000305}.
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DR   EMBL; X01094; CAB57806.1; -; Genomic_DNA.
DR   EMBL; M14820; AAB59223.1; -; Genomic_DNA.
DR   PIR; A00471; ODUTMB.
DR   AlphaFoldDB; P04371; -.
DR   SMR; P04371; -.
DR   UniPathway; UPA00705; -.
DR   GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0070469; C:respirasome; IEA:UniProtKB-KW.
DR   GO; GO:0004129; F:cytochrome-c oxidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0020037; F:heme binding; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0006119; P:oxidative phosphorylation; IEA:UniProtKB-UniPathway.
DR   Gene3D; 1.20.210.10; Cytochrome c oxidase-like, subunit I domain; 1.
DR   InterPro; IPR023616; Cyt_c_oxase-like_su1_dom.
DR   InterPro; IPR036927; Cyt_c_oxase-like_su1_sf.
DR   InterPro; IPR000883; Cyt_C_Oxase_1.
DR   InterPro; IPR023615; Cyt_c_Oxase_su1_BS.
DR   PANTHER; PTHR10422; CYTOCHROME C OXIDASE SUBUNIT 1; 1.
DR   PANTHER; PTHR10422:SF18; CYTOCHROME C OXIDASE SUBUNIT 1; 1.
DR   Pfam; PF00115; COX1; 1.
DR   PRINTS; PR01165; CYCOXIDASEI.
DR   SUPFAM; SSF81442; Cytochrome c oxidase subunit I-like; 1.
DR   PROSITE; PS50855; COX1; 1.
DR   PROSITE; PS00077; COX1_CUB; 1.
PE   3: Inferred from homology;
KW   Calcium; Copper; Electron transport; Heme; Iron; Magnesium; Membrane;
KW   Metal-binding; Mitochondrion; Mitochondrion inner membrane;
KW   Respiratory chain; Translocase; Transmembrane; Transmembrane helix;
KW   Transport.
FT   CHAIN           1..549
FT                   /note="Cytochrome c oxidase subunit 1"
FT                   /id="PRO_0000183428"
FT   TRANSMEM        18..38
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        59..79
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        100..120
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        148..168
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        181..201
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        237..257
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        279..299
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        310..330
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        340..360
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        379..399
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        410..430
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        460..480
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        495..515
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        527..547
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   BINDING         41
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         46
FT                   /ligand="Ca(2+)"
FT                   /ligand_id="ChEBI:CHEBI:29108"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         64
FT                   /ligand="Fe(II)-heme a"
FT                   /ligand_id="ChEBI:CHEBI:61715"
FT                   /ligand_note="low-spin"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         243
FT                   /ligand="Cu cation"
FT                   /ligand_id="ChEBI:CHEBI:23378"
FT                   /ligand_label="B"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         247
FT                   /ligand="O2"
FT                   /ligand_id="ChEBI:CHEBI:15379"
FT                   /evidence="ECO:0000250|UniProtKB:P00396"
FT   BINDING         292
FT                   /ligand="Cu cation"
FT                   /ligand_id="ChEBI:CHEBI:23378"
FT                   /ligand_label="B"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         293
FT                   /ligand="Cu cation"
FT                   /ligand_id="ChEBI:CHEBI:23378"
FT                   /ligand_label="B"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         370
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_note="ligand shared with subunit 2"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         371
FT                   /ligand="Mg(2+)"
FT                   /ligand_id="ChEBI:CHEBI:18420"
FT                   /ligand_note="ligand shared with subunit 2"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         378
FT                   /ligand="heme a3"
FT                   /ligand_id="ChEBI:CHEBI:83282"
FT                   /ligand_note="high-spin"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   BINDING         380
FT                   /ligand="Fe(II)-heme a"
FT                   /ligand_id="ChEBI:CHEBI:61715"
FT                   /ligand_note="low-spin"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
FT   CROSSLNK        243..247
FT                   /note="1'-histidyl-3'-tyrosine (His-Tyr)"
FT                   /evidence="ECO:0000250|UniProtKB:P00401"
SQ   SEQUENCE   549 AA;  63348 MW;  966050DDB7FFC2F0 CRC64;
     MFFLCLVCLS VSHKMIGICY LLVAILCGFI GYIYSLFIRL ELSLIGCGVL FGDYQFYNVL
     ITSHGLIMVF AFIMPITMGG FTNYFAPVMV GFPDMVFPRI NNMSFWMFIG GFGCLVSGFL
     TEEGMGVGWT LYPTLICIDF HSSLACDFII FSVHFLGISS ILNSINVVGT IFCCRRKYFS
     FLIWTLFIWG ALLTSILLII TLPVLAGGVT LLLCDRNFNT SFYDVVGGGD LVLFQHLFWF
     FGHPEVYIII LPVFGLVSTI IEVTSFRCVF SSVAMIYSML LISVLGMFVW AHHMFVVGMD
     VDSRAYFGSI TVLIGLPTCI KLFNWIYSFL FTDMCICFEI YFIYMFILMF LAGGLTGLFL
     SNVGIDILMH DTYFVVAHFH YVLSLGAVVG VFGGFFHFLM KWIPIELHTF WLFFFISTLW
     FGSNMVFFPL HSLGMFAFPR RISDYPISFL FWSAFTLYGM LLLTFLVIFC CCLFNVILFW
     DYCLFFINLF TYSLSIFFYF YTWVPVCMAI YLLVIDFAHI ILDYLLIILC FCFVFYIFFW
     QAFLLFFYI
//