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CYB_SMIHI
ID   CYB_SMIHI               Reviewed;         381 AA.
AC   Q9XP81;
DT   31-OCT-2006, integrated into UniProtKB/Swiss-Prot.
DT   01-NOV-1999, sequence version 1.
DT   03-AUG-2022, entry version 80.
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;
GN   Name=MT-CYB; Synonyms=COB, CYTB, MTCYB;
OS   Sminthopsis hirtipes (Hairy-footed dunnart).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Metatheria; Dasyuromorphia; Dasyuridae; Sminthopsis.
OX   NCBI_TaxID=90760;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RX   PubMed=10381317; DOI=10.1006/mpev.1998.0604;
RA   Blacket M.J., Krajewski C., Labrinidis A., Cambron B., Cooper S.,
RA   Westerman M.;
RT   "Systematic relationships within the dasyurid marsupial tribe Sminthopsini
RT   -- a multigene approach.";
RL   Mol. Phylogenet. Evol. 12:140-155(1999).
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; AF088927; AAD38437.1; -; Genomic_DNA.
DR   GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0045275; C:respiratory chain complex III; IEA:InterPro.
DR   GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR   GO; GO:0008121; F:ubiquinol-cytochrome-c reductase activity; IEA:InterPro.
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; IPR030689; Cytochrome_b.
DR   InterPro; IPR016174; Di-haem_cyt_TM.
DR   Pfam; PF00032; Cytochrom_B_C; 1.
DR   Pfam; PF00033; Cytochrome_B; 1.
DR   PIRSF; PIRSF038885; COB; 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..381
FT                   /note="Cytochrome b"
FT                   /id="PRO_0000254862"
FT   TRANSMEM        33..53
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        77..98
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        113..133
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        178..198
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        226..246
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        288..308
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        320..340
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        347..367
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         83
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         97
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         182
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         196
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"
SQ   SEQUENCE   381 AA;  42850 MW;  CA9C81C2A9CD557B CRC64;
     MINLRKTHPL MKIINHSFID LPAXSNISAW WNFGSSLGVC LMIQISTGLF LAMHYTSDTL
     TAFSSVAHIC RDVNYGWIIR NLHANGASMF FMCLFLHIGR GIYYGSYLYK ETWNIGVILL
     LTVMATAFVG YVLPWGQMSF WGATMVTNLL SAIPYIGTTL AEWIWGGFSV DKATLTRFFA
     FHFILPFIIM ALVIVHLLFL QETGSNNPSG INPDSDKIPF HPYYTIKDAL GLMFLLLVLL
     SLALFSPDLL GDPDNFSPAN PLNTPPHIKP EWYFLFAYAI LRSIPNKLGG VLALLASILI
     LLVIPFLHTA NQRSMMFRPI SQTLFWILTA NLITLTWIGG QPVEQPSIII GQLASILYFT
     LILVLMPLAG MFENYMLEPK W
 
 
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