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CYB_GARIS
ID   CYB_GARIS               Reviewed;         308 AA.
AC   P16363; Q37059;
DT   01-AUG-1990, integrated into UniProtKB/Swiss-Prot.
DT   01-APR-1993, sequence version 2.
DT   03-AUG-2022, entry version 110.
DE   RecName: Full=Cytochrome b;
DE   AltName: Full=Complex III subunit 3;
DE   AltName: Full=Complex III subunit III;
DE   AltName: Full=Cytochrome b-c1 complex subunit 3;
DE   AltName: Full=Ubiquinol-cytochrome-c reductase complex cytochrome b subunit;
DE   Flags: Fragment;
GN   Name=MT-CYB; Synonyms=COB, CYTB, MTCYB;
OS   Garritornis isidorei (Papuan babbler) (Pomatostomus isidorei).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Archelosauria; Archosauria; Dinosauria; Saurischia; Theropoda;
OC   Coelurosauria; Aves; Neognathae; Passeriformes; Pomatostomidae;
OC   Garritornis.
OX   NCBI_TaxID=9175;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=1676522; DOI=10.1098/rspb.1991.0017;
RA   Edwards S.V., Arctander P., Wilson A.C.;
RT   "Mitochondrial resolution of a deep branch in the genealogical tree for
RT   perching birds.";
RL   Proc. R. Soc. B 243:99-107(1991).
RN   [2]
RP   ERRATUM OF PUBMED:1676522.
RX   PubMed=8920253; DOI=10.1098/rspb.1996.0049;
RA   Edwards S.V., Arctander P.;
RL   Proc. R. Soc. B 263:323-323(1996).
RN   [3]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 5-98.
RC   TISSUE=Liver;
RX   PubMed=1979038; DOI=10.1093/genetics/126.3.695;
RA   Edwards S.V., Wilson A.C.;
RT   "Phylogenetically informative length polymorphism and sequence variability
RT   in mitochondrial DNA of Australian songbirds (Pomatostomus).";
RL   Genetics 126:695-711(1990).
RN   [4]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA] OF 15-93.
RX   PubMed=2762322; DOI=10.1073/pnas.86.16.6196;
RA   Kocher T.D., Thomas W.K., Meyer A., Edwards S.V., Paeaebo S.,
RA   Villablanca F.X., Wilson A.C.;
RT   "Dynamics of mitochondrial DNA evolution in animals: amplification and
RT   sequencing with conserved primers.";
RL   Proc. Natl. Acad. Sci. U.S.A. 86:6196-6200(1989).
CC   -!- FUNCTION: Component of the ubiquinol-cytochrome c reductase complex
CC       (complex III or cytochrome b-c1 complex) that is part of the
CC       mitochondrial respiratory chain. The b-c1 complex mediates electron
CC       transfer from ubiquinol to cytochrome c. Contributes to the generation
CC       of a proton gradient across the mitochondrial membrane that is then
CC       used for ATP synthesis. {ECO:0000250|UniProtKB:P00157}.
CC   -!- COFACTOR:
CC       Name=heme b; Xref=ChEBI:CHEBI:60344;
CC         Evidence={ECO:0000250|UniProtKB:P00157};
CC       Note=Binds 2 heme b groups non-covalently.
CC       {ECO:0000250|UniProtKB:P00157};
CC   -!- SUBUNIT: The cytochrome bc1 complex contains 11 subunits: 3 respiratory
CC       subunits (MT-CYB, CYC1 and UQCRFS1), 2 core proteins (UQCRC1 and
CC       UQCRC2) and 6 low-molecular weight proteins (UQCRH/QCR6, UQCRB/QCR7,
CC       UQCRQ/QCR8, UQCR10/QCR9, UQCR11/QCR10 and a cleavage product of
CC       UQCRFS1). This cytochrome bc1 complex then forms a dimer.
CC       {ECO:0000250|UniProtKB:P00157}.
CC   -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC       {ECO:0000250|UniProtKB:P00157}; Multi-pass membrane protein
CC       {ECO:0000250|UniProtKB:P00157}.
CC   -!- MISCELLANEOUS: Heme 1 (or BL or b562) is low-potential and absorbs at
CC       about 562 nm, and heme 2 (or BH or b566) is high-potential and absorbs
CC       at about 566 nm. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the cytochrome b family. {ECO:0000255|PROSITE-
CC       ProRule:PRU00967, ECO:0000255|PROSITE-ProRule:PRU00968}.
CC   -!- CAUTION: The full-length protein contains only eight transmembrane
CC       helices, not nine as predicted by bioinformatics tools.
CC       {ECO:0000250|UniProtKB:P00157}.
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DR   EMBL; X60938; CAA43273.1; -; Genomic_DNA.
DR   EMBL; X54913; CAA38685.1; -; Genomic_DNA.
DR   EMBL; X54886; CAA38659.1; -; Genomic_DNA.
DR   EMBL; X54887; CAA38660.1; -; Genomic_DNA.
DR   EMBL; M25689; AAA32140.1; -; Genomic_DNA.
DR   PIR; S22928; S22928.
DR   AlphaFoldDB; P16363; -.
DR   SMR; P16363; -.
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:0009055; F:electron transfer activity; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0022904; P:respiratory electron transport chain; IEA:InterPro.
DR   CDD; cd00290; cytochrome_b_C; 1.
DR   CDD; cd00284; Cytochrome_b_N; 1.
DR   Gene3D; 1.20.810.10; -; 1.
DR   InterPro; IPR005798; Cyt_b/b6_C.
DR   InterPro; IPR036150; Cyt_b/b6_C_sf.
DR   InterPro; IPR005797; Cyt_b/b6_N.
DR   InterPro; IPR027387; Cytb/b6-like_sf.
DR   InterPro; IPR016174; Di-haem_cyt_TM.
DR   Pfam; PF00032; Cytochrom_B_C; 1.
DR   Pfam; PF00033; Cytochrome_B; 1.
DR   SUPFAM; SSF81342; SSF81342; 1.
DR   SUPFAM; SSF81648; SSF81648; 1.
DR   PROSITE; PS51003; CYTB_CTER; 1.
DR   PROSITE; PS51002; CYTB_NTER; 1.
PE   3: Inferred from homology;
KW   Electron transport; Heme; Iron; Membrane; Metal-binding; Mitochondrion;
KW   Mitochondrion inner membrane; Respiratory chain; Transmembrane;
KW   Transmembrane helix; Transport; Ubiquinone.
FT   CHAIN           <1..>308
FT                   /note="Cytochrome b"
FT                   /id="PRO_0000061426"
FT   TRANSMEM        1..21
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        45..66
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        81..101
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        146..166
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        194..214
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        256..276
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        288..308
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         51
FT                   /ligand="heme b"
FT                   /ligand_id="ChEBI:CHEBI:60344"
FT                   /ligand_label="b562"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         65
FT                   /ligand="heme b"
FT                   /ligand_id="ChEBI:CHEBI:60344"
FT                   /ligand_label="b566"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         150
FT                   /ligand="heme b"
FT                   /ligand_id="ChEBI:CHEBI:60344"
FT                   /ligand_label="b562"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         164
FT                   /ligand="heme b"
FT                   /ligand_id="ChEBI:CHEBI:60344"
FT                   /ligand_label="b566"
FT                   /ligand_part="Fe"
FT                   /ligand_part_id="ChEBI:CHEBI:18248"
FT                   /note="axial binding residue"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         169
FT                   /ligand="a ubiquinone"
FT                   /ligand_id="ChEBI:CHEBI:16389"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   CONFLICT        7
FT                   /note="M -> I (in Ref. 3; CAA38685/CAA38659/CAA38660)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        16
FT                   /note="G -> A (in Ref. 4; AAA32140)"
FT                   /evidence="ECO:0000305"
FT   CONFLICT        90
FT                   /note="A -> T (in Ref. 4; AAA32140)"
FT                   /evidence="ECO:0000305"
FT   NON_TER         1
FT   NON_TER         308
SQ   SEQUENCE   308 AA;  34013 MW;  5BF01EA2B0DDDBDC CRC64;
     SGSLLGMCLI VRIITGLFLA AHYTADTSLA FNSVAHTCRN VQFGWLIRNL HANGASLFFI
     CIYLHIGRGL YYGSYLNKET WNIGVILLLA LMATAFVGYV LPWGQMSFWG ATVITNLFSA
     IPYIGQTLVE WAWGGFSVDN PTLTRFFALH FLLPFVIAGL TLVHLTFLHE TGSNNPLGIP
     SDCDKIPFHP YYSTKDVLGF ALLLTPLIAL ALFSPNLLGD PENFTPANPL ATPPHIKPEW
     YFLFAYAILR SIPNKLGGVL ALAASVLVLF LIPLLHNSKL RSMTFRPLSQ ILFWALVANL
     LVLTWVGS
 
 
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