ID   COX3_ALKPO              Reviewed;         206 AA.
AC   Q04442; D3FU48;
DT   01-FEB-1994, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1994, sequence version 1.
DT   03-AUG-2022, entry version 116.
DE   RecName: Full=Cytochrome c oxidase subunit 3;
DE            EC=7.1.1.9;
DE   AltName: Full=Cytochrome aa3 subunit 3;
DE   AltName: Full=Cytochrome c oxidase polypeptide III;
GN   Name=ctaE; OrderedLocusNames=BpOF4_00905;
OS   Alkalihalophilus pseudofirmus (strain ATCC BAA-2126 / JCM 17055 / OF4)
OS   (Bacillus pseudofirmus).
OC   Bacteria; Firmicutes; Bacilli; Bacillales; Bacillaceae; Alkalihalophilus.
OX   NCBI_TaxID=398511;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=7678007; DOI=10.1016/s0021-9258(18)54205-8;
RA   Quirk P.G., Hicks D.B., Krulwich T.A.;
RT   "Cloning of the cta operon from alkaliphilic Bacillus firmus OF4 and
RT   characterization of the pH-regulated cytochrome caa3 oxidase it encodes.";
RL   J. Biol. Chem. 268:678-685(1993).
RN   [2]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-2126 / JCM 17055 / OF4;
RX   PubMed=21951522; DOI=10.1111/j.1462-2920.2011.02591.x;
RA   Janto B., Ahmed A., Ito M., Liu J., Hicks D.B., Pagni S., Fackelmayer O.J.,
RA   Smith T.A., Earl J., Elbourne L.D., Hassan K., Paulsen I.T., Kolsto A.B.,
RA   Tourasse N.J., Ehrlich G.D., Boissy R., Ivey D.M., Li G., Xue Y., Ma Y.,
RA   Hu F.Z., Krulwich T.A.;
RT   "Genome of alkaliphilic Bacillus pseudofirmus OF4 reveals adaptations that
RT   support the ability to grow in an external pH range from 7.5 to 11.4.";
RL   Environ. Microbiol. 13:3289-3309(2011).
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   -!- SUBCELLULAR LOCATION: Cell membrane; Multi-pass membrane protein.
CC   -!- SIMILARITY: Belongs to the cytochrome c oxidase subunit 3 family.
CC       {ECO:0000305}.
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DR   EMBL; M94110; AAA22366.1; -; Genomic_DNA.
DR   EMBL; CP001878; ADC48250.1; -; Genomic_DNA.
DR   RefSeq; WP_012959532.1; NC_013791.2.
DR   AlphaFoldDB; Q04442; -.
DR   SMR; Q04442; -.
DR   STRING; 398511.BpOF4_00905; -.
DR   EnsemblBacteria; ADC48250; ADC48250; BpOF4_00905.
DR   KEGG; bpf:BpOF4_00905; -.
DR   eggNOG; COG1845; Bacteria.
DR   HOGENOM; CLU_044071_3_2_9; -.
DR   OMA; FLDLLWV; -.
DR   OrthoDB; 1502742at2; -.
DR   Proteomes; UP000001544; Chromosome.
DR   GO; GO:0016021; C:integral component of membrane; IEA:UniProtKB-KW.
DR   GO; GO:0005886; C:plasma membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0004129; F:cytochrome-c oxidase activity; IEA:UniProtKB-EC.
DR   GO; GO:0019646; P:aerobic electron transport chain; IEA:InterPro.
DR   CDD; cd02863; Ubiquinol_oxidase_III; 1.
DR   Gene3D; 1.20.120.80; -; 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   InterPro; IPR033946; Ubiquinol_oxase_su3_dom.
DR   PANTHER; PTHR11403; PTHR11403; 1.
DR   Pfam; PF00510; COX3; 1.
DR   SUPFAM; SSF81452; SSF81452; 1.
DR   PROSITE; PS50253; COX3; 1.
PE   3: Inferred from homology;
KW   Cell membrane; Membrane; Reference proteome; Translocase; Transmembrane;
KW   Transmembrane helix.
FT   CHAIN           1..206
FT                   /note="Cytochrome c oxidase subunit 3"
FT                   /id="PRO_0000183875"
FT   TRANSMEM        26..46
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        68..88
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        97..117
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        143..163
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
FT   TRANSMEM        185..205
FT                   /note="Helical"
FT                   /evidence="ECO:0000255"
SQ   SEQUENCE   206 AA;  22856 MW;  B30CA3D359FC4483 CRC64;
     MAGAVDTSKG LPSHPERATL EGKNKFLGFW FFLGGETILF ATFFGTFLGL RGGTADGPTS
     ADLVALDLVF IMTMLLLTSS LTSVLAMFAM KKNNFKAMMI WMWITVVLGL AFLGFEIYEF
     HHYVVDYQFG FSTSAFASAF YSLVGLHGAH VAFGLSWIIV LLIRYRKSGI TLTNAPKFYV
     AGLYWHFIDV VWVFIFTVVY LMGVGG