CYB_ASPFM
ID CYB_ASPFM Reviewed; 145 AA.
AC P56630;
DT 15-DEC-1998, integrated into UniProtKB/Swiss-Prot.
DT 15-DEC-1998, sequence version 1.
DT 03-AUG-2022, entry version 96.
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=cob; Synonyms=cytB;
OS Neosartorya fumigata (Aspergillus fumigatus).
OG Mitochondrion.
OC Eukaryota; Fungi; Dikarya; Ascomycota; Pezizomycotina; Eurotiomycetes;
OC Eurotiomycetidae; Eurotiales; Aspergillaceae; Aspergillus;
OC Aspergillus subgen. Fumigati.
OX NCBI_TaxID=746128;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC STRAIN=IFM 40804, IFM 40806, IFM 40807, IFM 40819, IFM 41206, IFM 41392,
RC IFM 45916, IFM 45917, IFM 46890, and IFM 5355;
RX PubMed=9776828; DOI=10.1080/02681219880000231;
RA Wang L., Yokoyama K., Miyaji M., Nishimura K.;
RT "The identification and phylogenetic relationship of pathogenic species of
RT Aspergillus based on the mitochondrial cytochrome b gene.";
RL Med. Mycol. 36:153-164(1998).
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:P00163}.
CC -!- COFACTOR:
CC Name=heme b; Xref=ChEBI:CHEBI:60344;
CC Evidence={ECO:0000250|UniProtKB:P00163};
CC Note=Binds 2 heme b groups non-covalently.
CC {ECO:0000250|UniProtKB:P00163};
CC -!- SUBUNIT: Fungal cytochrome b-c1 complex contains 10 subunits; 3
CC respiratory subunits, 2 core proteins and 5 low-molecular weight
CC proteins. Cytochrome b-c1 complex is a homodimer.
CC {ECO:0000250|UniProtKB:P00163}.
CC -!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
CC {ECO:0000250|UniProtKB:P00163}; Multi-pass membrane protein
CC {ECO:0000250|UniProtKB:P00163}.
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 protein contains only eight transmembrane helices, not
CC nine as predicted by bioinformatics tools.
CC {ECO:0000250|UniProtKB:P00163}.
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DR EMBL; AB000566; BAA34133.2; -; Genomic_DNA.
DR EMBL; AB000567; BAA34134.2; -; Genomic_DNA.
DR EMBL; AB000586; BAA34151.1; -; Genomic_DNA.
DR EMBL; AB000587; BAA34152.1; -; Genomic_DNA.
DR EMBL; AB000588; BAA34153.1; -; Genomic_DNA.
DR EMBL; AB000589; BAA34154.1; -; Genomic_DNA.
DR EMBL; AB000590; BAA34155.1; -; Genomic_DNA.
DR EMBL; AB000591; BAA34156.1; -; Genomic_DNA.
DR EMBL; AB000592; BAA34157.1; -; Genomic_DNA.
DR EMBL; AB000593; BAA34158.1; -; Genomic_DNA.
DR AlphaFoldDB; P56630; -.
DR SMR; P56630; -.
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 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..>145
FT /note="Cytochrome b"
FT /id="PRO_0000061736"
FT TRANSMEM 38..58
FT /note="Helical"
FT /evidence="ECO:0000250|UniProtKB:P00163"
FT TRANSMEM 85..105
FT /note="Helical"
FT /evidence="ECO:0000250|UniProtKB:P00163"
FT BINDING 42
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:0000255|PROSITE-ProRule:PRU00968"
FT BINDING 56
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:0000255|PROSITE-ProRule:PRU00968"
FT BINDING 61
FT /ligand="a ubiquinone"
FT /ligand_id="ChEBI:CHEBI:16389"
FT /evidence="ECO:0000250|UniProtKB:P00157"
FT NON_TER 1
FT NON_TER 145
SQ SEQUENCE 145 AA; 16295 MW; 376A89A0C8F6FA7D CRC64;
WGATVITNLM SAIPWIGQDI VEFIWGGFSV NNATLNRFFA LHFLLPFVLA ALVIMHLIAM
HDTVGSGNPL GISGNYDRLP FAPYFVFKDL VTVFIFFIVL SVFVFFMPNA LGDSENYVMA
NPMQTPPAIV PEWYLLPFYA ILRSI