ID   Q5MCM5_MOUSE            Unreviewed;        42 AA.
AC   Q5MCM5;
DT   01-FEB-2005, integrated into UniProtKB/TrEMBL.
DT   01-FEB-2005, sequence version 1.
DT   24-JAN-2024, entry version 92.
DE   RecName: Full=Cytochrome c oxidase subunit 3 {ECO:0000256|ARBA:ARBA00015944, ECO:0000256|RuleBase:RU003375};
DE   Flags: Fragment;
GN   Name=COX3 {ECO:0000313|EMBL:AAW21322.1};
OS   Mus musculus (Mouse).
OG   Mitochondrion {ECO:0000313|EMBL:AAW21322.1}.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Glires; Rodentia; Myomorpha; Muroidea; Muridae;
OC   Murinae; Mus; Mus.
OX   NCBI_TaxID=10090 {ECO:0000313|EMBL:AAW21322.1};
RN   [1] {ECO:0000313|EMBL:AAW21322.1}
RP   NUCLEOTIDE SEQUENCE.
RC   STRAIN=129/Ola {ECO:0000313|EMBL:AAW21322.1};
RA   Menzorov A.G., Matveeva N.M., Larkin D.M., Zaykin D.V., Serov O.L.;
RT   "Fate of Parental Mitochondria in Embryonic Stem Hybrid Cells.";
RL   Cell and Tissue Biol. 2:393-399(2008).
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:0000256|RuleBase:RU003375}.
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:0000256|ARBA:ARBA00029331};
CC       PhysiologicalDirection=left-to-right; Xref=Rhea:RHEA:11437;
CC         Evidence={ECO:0000256|ARBA:ARBA00029331};
CC   -!- SUBCELLULAR LOCATION: Membrane {ECO:0000256|ARBA:ARBA00004141}; Multi-
CC       pass membrane protein {ECO:0000256|ARBA:ARBA00004141}.
CC   -!- SIMILARITY: Belongs to the cytochrome c oxidase subunit 3 family.
CC       {ECO:0000256|ARBA:ARBA00010581, ECO:0000256|RuleBase:RU003375}.
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DR   EMBL; AY836751; AAW21322.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q5MCM5; -.
DR   ChiTaRS; mt-Co3; mouse.
DR   GO; GO:0016020; C:membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0005739; C:mitochondrion; IEA:UniProtKB-KW.
DR   GO; GO:0004129; F:cytochrome-c oxidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0019646; P:aerobic electron transport chain; IEA:InterPro.
DR   Gene3D; 1.20.120.80; Cytochrome c oxidase, subunit III, four-helix bundle; 1.
DR   InterPro; IPR024791; Cyt_c/ubiquinol_Oxase_su3.
DR   InterPro; IPR000298; Cyt_c_oxidase-like_su3.
DR   InterPro; IPR035973; Cyt_c_oxidase_su3-like_sf.
DR   InterPro; IPR013833; Cyt_c_oxidase_su3_a-hlx.
DR   PANTHER; PTHR11403:SF7; CYTOCHROME C OXIDASE SUBUNIT 3; 1.
DR   PANTHER; PTHR11403; CYTOCHROME C OXIDASE SUBUNIT III; 1.
DR   Pfam; PF00510; COX3; 1.
DR   SUPFAM; SSF81452; Cytochrome c oxidase subunit III-like; 1.
DR   PROSITE; PS50253; COX3; 1.
PE   3: Inferred from homology;
KW   Membrane {ECO:0000256|ARBA:ARBA00023136, ECO:0000256|SAM:Phobius};
KW   Mitochondrion {ECO:0000256|RuleBase:RU003375, ECO:0000313|EMBL:AAW21322.1};
KW   Translocase {ECO:0000256|ARBA:ARBA00022967};
KW   Transmembrane {ECO:0000256|ARBA:ARBA00022692,
KW   ECO:0000256|RuleBase:RU003375};
KW   Transmembrane helix {ECO:0000256|ARBA:ARBA00022989,
KW   ECO:0000256|SAM:Phobius}.
FT   TRANSMEM        21..41
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|SAM:Phobius"
FT   DOMAIN          1..42
FT                   /note="Heme-copper oxidase subunit III family profile"
FT                   /evidence="ECO:0000259|PROSITE:PS50253"
FT   NON_TER         1
FT                   /evidence="ECO:0000313|EMBL:AAW21322.1"
SQ   SEQUENCE   42 AA;  5307 MW;  7AE6983DB513FAEE CRC64;
     LRQLKFHFTS KHHFGFEAAA WYWHFVDVVW LFLYVSIYWW GS
//