COX2_ALBTU
ID COX2_ALBTU Reviewed; 224 AA.
AC Q09334;
DT 01-NOV-1995, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1995, sequence version 1.
DT 03-AUG-2022, entry version 108.
DE RecName: Full=Cytochrome c oxidase subunit 2;
DE EC=7.1.1.9;
DE AltName: Full=Cytochrome c oxidase polypeptide II;
GN Name=COII;
OS Albinaria turrita (Door snail) (Clausilia turrita).
OG Mitochondrion.
OC Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Mollusca; Gastropoda;
OC Heterobranchia; Euthyneura; Panpulmonata; Eupulmonata; Stylommatophora;
OC Helicina; Clausilioidea; Clausiliidae; Alopiinae; Albinaria.
OX NCBI_TaxID=27820;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX PubMed=8007005; DOI=10.1007/bf00163154;
RA Lecanidou R., Douris V., Rodakis G.C.;
RT "Novel features of metazoan mtDNA revealed from sequence analysis of three
RT mitochondrial DNA segments of the land snail Albinaria turrita (Gastropoda:
RT Clausiliidae).";
RL J. Mol. Evol. 38:369-382(1994).
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] + 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: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}.
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DR EMBL; X71395; CAA50517.1; -; Genomic_DNA.
DR AlphaFoldDB; Q09334; -.
DR SMR; Q09334; -.
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:0070469; C:respirasome; IEA:UniProtKB-KW.
DR GO; GO:0005507; F:copper ion binding; IEA:InterPro.
DR GO; GO:0004129; F:cytochrome-c oxidase activity; IEA:UniProtKB-EC.
DR CDD; cd13912; CcO_II_C; 1.
DR Gene3D; 1.10.287.90; -; 1.
DR Gene3D; 2.60.40.420; -; 1.
DR InterPro; IPR045187; CcO_II.
DR InterPro; IPR002429; CcO_II-like_C.
DR InterPro; IPR034210; CcO_II_C.
DR InterPro; IPR001505; Copper_CuA.
DR InterPro; IPR008972; Cupredoxin.
DR InterPro; IPR011759; Cyt_c_oxidase_su2_TM_dom.
DR InterPro; IPR036257; Cyt_c_oxidase_su2_TM_sf.
DR PANTHER; PTHR22888; PTHR22888; 1.
DR Pfam; PF00116; COX2; 1.
DR Pfam; PF02790; COX2_TM; 1.
DR SUPFAM; SSF49503; SSF49503; 1.
DR SUPFAM; SSF81464; SSF81464; 1.
DR PROSITE; PS00078; COX2; 1.
DR PROSITE; PS50857; COX2_CUA; 1.
DR PROSITE; PS50999; COX2_TM; 1.
PE 3: Inferred from homology;
KW Copper; Electron transport; Magnesium; Membrane; Metal-binding;
KW Mitochondrion; Mitochondrion inner membrane; Respiratory chain;
KW Translocase; Transmembrane; Transmembrane helix; Transport.
FT CHAIN 1..224
FT /note="Cytochrome c oxidase subunit 2"
FT /id="PRO_0000183488"
FT TOPO_DOM 1..26
FT /note="Mitochondrial intermembrane"
FT /evidence="ECO:0000255"
FT TRANSMEM 27..48
FT /note="Helical"
FT /evidence="ECO:0000305"
FT TOPO_DOM 49..62
FT /note="Mitochondrial matrix"
FT /evidence="ECO:0000255"
FT TRANSMEM 63..82
FT /note="Helical"
FT /evidence="ECO:0000305"
FT TOPO_DOM 83..224
FT /note="Mitochondrial intermembrane"
FT /evidence="ECO:0000255"
FT BINDING 161
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A1"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 196
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A1"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 196
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A2"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 198
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A2"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 198
FT /ligand="Mg(2+)"
FT /ligand_id="ChEBI:CHEBI:18420"
FT /ligand_note="ligand shared with subunit 1"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 200
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A1"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 200
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A2"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 204
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A2"
FT /evidence="ECO:0000250|UniProtKB:P00410"
FT BINDING 207
FT /ligand="Cu cation"
FT /ligand_id="ChEBI:CHEBI:23378"
FT /ligand_label="A1"
FT /evidence="ECO:0000250|UniProtKB:P00410"
SQ SEQUENCE 224 AA; 25091 MW; 5D44CC670932075A CRC64;
MSTWGQMNLM DPASPIQIEM MLFHDHAMAI LIGIFTLVSC LGVKLCFNTL STRTMHEAQL
LETLWTILPA FLLVWLALPS LRLLYLLDEQ SSEGIVLKAI GHQWYWSYEM PSMNVSSIDS
YMIPEDDLKP GEYRLLEVDN RPTVPYGMDI NVIATSADVI HAWALPSMGV KMDAVPGRLN
SMGFHANLPG IYYGQCSEIC GANHSFMPIA IEAVDVKDFI NMCN
