COX1_ACACA
ID COX1_ACACA Reviewed; 873 AA.
AC Q37370;
DT 30-MAY-2000, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1996, sequence version 1.
DT 03-AUG-2022, entry version 127.
DE RecName: Full=Cytochrome c oxidase subunit 1+2;
DE EC=7.1.1.9;
DE AltName: Full=Cytochrome c oxidase polypeptide I+II;
GN Name=COX1/2;
OS Acanthamoeba castellanii (Amoeba).
OG Mitochondrion.
OC Eukaryota; Amoebozoa; Discosea; Longamoebia; Centramoebida;
OC Acanthamoebidae; Acanthamoeba.
OX NCBI_TaxID=5755;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC STRAIN=ATCC 30010 / Neff;
RX PubMed=7844823; DOI=10.1006/jmbi.1994.0043;
RA Burger G., Plante I., Lonergan K.M., Gray M.W.;
RT "The mitochondrial DNA of the amoeboid protozoon, Acanthamoeba castellanii:
RT complete sequence, gene content and genome organization.";
RL J. Mol. Biol. 245:522-537(1995).
RN [2]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=8632465; DOI=10.1006/jmbi.1996.0220;
RA Lonergan K.M., Gray M.W.;
RT "Expression of a continuous open reading frame encoding subunits 1 and 2 of
RT cytochrome c oxidase in the mitochondrial DNA of Acanthamoeba
RT castellanii.";
RL J. Mol. Biol. 257:1019-1030(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: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: In the N-terminal section; belongs to the heme-copper
CC respiratory oxidase family. {ECO:0000305}.
CC -!- SIMILARITY: In the C-terminal section; belongs to the cytochrome c
CC oxidase subunit 2 family. {ECO:0000305}.
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DR EMBL; U12386; AAD11820.1; -; Genomic_DNA.
DR PIR; S53828; S53828.
DR RefSeq; NP_042527.1; NC_001637.1.
DR AlphaFoldDB; Q37370; -.
DR SMR; Q37370; -.
DR GeneID; 1734020; -.
DR UniPathway; UPA00705; -.
DR GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR GO; GO:0045277; C:respiratory chain complex IV; IEA:InterPro.
DR GO; GO:0005507; F:copper ion binding; IEA:InterPro.
DR GO; GO:0004129; F:cytochrome-c oxidase activity; IEA:UniProtKB-EC.
DR GO; GO:0020037; F:heme binding; IEA:InterPro.
DR GO; GO:0006119; P:oxidative phosphorylation; IEA:UniProtKB-UniPathway.
DR CDD; cd13912; CcO_II_C; 1.
DR CDD; cd01663; Cyt_c_Oxidase_I; 1.
DR Gene3D; 1.10.287.90; -; 1.
DR Gene3D; 1.20.210.10; -; 1.
DR Gene3D; 2.60.40.420; -; 1.
DR InterPro; IPR002429; CcO_II-like_C.
DR InterPro; IPR034210; CcO_II_C.
DR InterPro; IPR001505; Copper_CuA.
DR InterPro; IPR008972; Cupredoxin.
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 InterPro; IPR033944; Cyt_c_oxase_su1_dom.
DR InterPro; IPR014222; Cyt_c_oxidase_su2.
DR InterPro; IPR011759; Cyt_c_oxidase_su2_TM_dom.
DR InterPro; IPR036257; Cyt_c_oxidase_su2_TM_sf.
DR PANTHER; PTHR10422; PTHR10422; 1.
DR Pfam; PF00115; COX1; 1.
DR Pfam; PF00116; COX2; 2.
DR Pfam; PF02790; COX2_TM; 2.
DR PRINTS; PR01165; CYCOXIDASEI.
DR SUPFAM; SSF49503; SSF49503; 1.
DR SUPFAM; SSF81442; SSF81442; 1.
DR SUPFAM; SSF81464; SSF81464; 1.
DR TIGRFAMs; TIGR02866; CoxB; 1.
DR PROSITE; PS50855; COX1; 1.
DR PROSITE; PS00077; COX1_CUB; 1.
DR PROSITE; PS00078; COX2; 1.
DR PROSITE; PS50857; COX2_CUA; 1.
DR PROSITE; PS50999; COX2_TM; 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..873
FT /note="Cytochrome c oxidase subunit 1+2"
FT /id="PRO_0000183275"
FT TRANSMEM 29..49
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 70..90
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 91..111
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 114..134
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 159..179
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 197..217
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 248..268
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 280..300
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 323..343
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 351..371
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 390..410
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 427..447
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 469..489
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 536..556
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 585..605
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 656..676
FT /note="Helical"
FT /evidence="ECO:0000255"
FT TRANSMEM 845..865
FT /note="Helical"
FT /evidence="ECO:0000255"
FT REGION 1..474
FT /note="COX1"
FT REGION 475..843
FT /note="COX2"
FT BINDING 52
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 55
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 57
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 75
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 254
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="B"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 258
FT /ligand="O2"
FT /ligand_id="ChEBI:CHEBI:15379"
FT /evidence="ECO:0000250|UniProtKB:P00396"
FT BINDING 303
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="B"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 304
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="B"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 381
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 382
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 389
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 391
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 454
FT /ligand="Ca(2+)"
FT /ligand_id="ChEBI:CHEBI:29108"
FT /evidence="ECO:0000250|UniProtKB:P00401"
FT BINDING 801
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A"
FT /evidence="ECO:0000305"
FT BINDING 836
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A"
FT /evidence="ECO:0000305"
FT BINDING 840
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A"
FT /evidence="ECO:0000305"
FT BINDING 844
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A"
FT /evidence="ECO:0000305"
FT CROSSLNK 254..258
FT /note="1'-histidyl-3'-tyrosine (His-Tyr)"
FT /evidence="ECO:0000250|UniProtKB:P00401"
SQ SEQUENCE 873 AA; 99214 MW; 0BC820F0162B8EB3 CRC64;
MINRLLNNLT SFFTDNRWLF STNHKDIGTL YLIFGGFSGI IGTIFSMIIR LELAAPGSQI
LSGNSQLYNV IITAHAFVMI FFFVMPVMIG GFGNWFVPLM IGAPDMAFPR LNNISFWLLP
PSLFLLLCSS LVEFGAGTGW TVYPPLSSIV AHSGGSVDLA IFSLHLAGIS SLLGAINFIT
TIFNMRVPGL SMHKLPLFVW SVLITAFLLL FSLPVLAGAI TMLLTDRNFN TSFFDPSGGG
DPILYQHLFW FFGHPEVYIL ILPAFGIVSQ IIGTFSNKSI FGYIGMVYAM LSIAVLGFIV
WAHHMYTVGL DVDTRAYFTA ATMMIAVPTG IKIFSWIATL WGGQIVRKTP LLFVIGFLIL
FTLGGLTGIV LSNAGLDIML HDTYYVVAHF HYVLSMGAVF AFFAGFYYWF WKISGYTYNE
MYGNVHFWLM FIGVNLTFFP MHFVGLAGMP RRIPDYPDNY YYWNILSSFG SIISSVSVIV
FFYLIYLAFN NNNTPKLIKL VHSIFAPYIN TLSKNLLTFA SIKSTSDSSF FKFSKFFIFF
MVSLSVLFIF YDSLLCLNDH TNSWKIGFQD PTTPIAYGII KLHDHILFFL AVILFVVGYL
LLSTYKKFYY GSLNNDLPES KRISLFDTLI NTYKENLSFN VTNRTYNINH GTTIEIIWTI
LPAFILLFIA VPSFALLYAM DEIIDPVLTV KVIGHQWYWS YEYSDYSVVY SNRMLDYDSI
DRFAAMEMMY KGMGYLKDRS LLSYLYIPMV IPETTIKFDS YMIHEAELNL GDLRLLKTDM
PLFLPKNTHI RLLITSSDVL HSWAVPSFGV KVDAVPGRLN QTSLYLKNTG TFYGQCSELC
GVNHAFMPIE VYVVNPVYFY NYVYIYFKNF NLI
