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Cytochrome b (Complex III subunit 3) (Complex III subunit III) (Cytochrome b-c1 complex subunit 3) (Ubiquinol-cytochrome-c reductase complex cytochrome b subunit)

 CYB_DASAL               Reviewed;         381 AA.
Q34289;
15-JUL-1998, integrated into UniProtKB/Swiss-Prot.
01-JUN-1998, sequence version 2.
18-JAN-2017, entry version 82.
RecName: Full=Cytochrome b;
AltName: Full=Complex III subunit 3;
AltName: Full=Complex III subunit III;
AltName: Full=Cytochrome b-c1 complex subunit 3;
AltName: Full=Ubiquinol-cytochrome-c reductase complex cytochrome b subunit;
Name=MT-CYB; Synonyms=COB, CYTB, MTCYB;
Dasyurus albopunctatus (Native cat) (New Guinean quoll).
Mitochondrion.
Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
Mammalia; Metatheria; Dasyuromorphia; Dasyuridae; Dasyurus.
NCBI_TaxID=32545;
[1]
NUCLEOTIDE SEQUENCE [GENOMIC DNA].
Krajewski C., Painter J., Buckley L., Westerman M.;
"Phylogenetic structure of the marsupial family Dasyuridae based on
cytochrome-b DNA sequences.";
J. Mammal. Evol. 2:25-35(1994).
-!- FUNCTION: Component of the ubiquinol-cytochrome c reductase
complex (complex III or cytochrome b-c1 complex) that is part of
the mitochondrial respiratory chain. The b-c1 complex mediates
electron transfer from ubiquinol to cytochrome c. Contributes to
the generation of a proton gradient across the mitochondrial
membrane that is then used for ATP synthesis.
{ECO:0000250|UniProtKB:P00157}.
-!- COFACTOR:
Name=heme; Xref=ChEBI:CHEBI:30413;
Evidence={ECO:0000250|UniProtKB:P00157};
Note=Binds 2 heme groups non-covalently.
{ECO:0000250|UniProtKB:P00157};
-!- SUBUNIT: The cytochrome bc1 complex contains 11 subunits: 3
respiratory subunits (MT-CYB, CYC1 and UQCRFS1), 2 core proteins
(UQCRC1 and UQCRC2) and 6 low-molecular weight proteins
(UQCRH/QCR6, UQCRB/QCR7, UQCRQ/QCR8, UQCR10/QCR9, UQCR11/QCR10 and
a cleavage product of UQCRFS1). This cytochrome bc1 complex then
forms a dimer. {ECO:0000250|UniProtKB:P00157}.
-!- SUBCELLULAR LOCATION: Mitochondrion inner membrane
{ECO:0000250|UniProtKB:P00157}; Multi-pass membrane protein
{ECO:0000250|UniProtKB:P00157}.
-!- MISCELLANEOUS: Heme 1 (or BL or b562) is low-potential and absorbs
at about 562 nm, and heme 2 (or BH or b566) is high-potential and
absorbs at about 566 nm. {ECO:0000250}.
-!- SIMILARITY: Belongs to the cytochrome b family.
{ECO:0000255|PROSITE-ProRule:PRU00967, ECO:0000255|PROSITE-
ProRule:PRU00968}.
-!- CAUTION: The full-length protein contains only eight transmembrane
helices, not nine as predicted by bioinformatics tools.
{ECO:0000250|UniProtKB:P00157}.
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EMBL; U07580; AAB88758.1; -; Genomic_DNA.
ProteinModelPortal; Q34289; -.
HOVERGEN; HBG017694; -.
GO; GO:0005743; C:mitochondrial inner membrane; IEA:UniProtKB-SubCell.
GO; GO:0045275; C:respiratory chain complex III; IEA:InterPro.
GO; GO:0009055; F:electron carrier activity; IEA:InterPro.
GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
GO; GO:0008121; F:ubiquinol-cytochrome-c reductase activity; IEA:InterPro.
GO; GO:0006122; P:mitochondrial electron transport, ubiquinol to cytochrome c; IEA:InterPro.
CDD; cd00290; cytochrome_b_C; 1.
CDD; cd00284; Cytochrome_b_N; 1.
Gene3D; 1.20.810.10; -; 1.
InterPro; IPR005798; Cyt_b/b6_C.
InterPro; IPR005797; Cyt_b/b6_N.
InterPro; IPR027387; Cytb/b6-like.
InterPro; IPR030689; Cytochrome_b.
InterPro; IPR016174; Di-haem_cyt_TM.
Pfam; PF00032; Cytochrom_B_C; 1.
Pfam; PF00033; Cytochrome_B; 1.
PIRSF; PIRSF038885; COB; 1.
SUPFAM; SSF81342; SSF81342; 1.
SUPFAM; SSF81648; SSF81648; 1.
PROSITE; PS51003; CYTB_CTER; 1.
PROSITE; PS51002; CYTB_NTER; 1.
3: Inferred from homology;
Electron transport; Heme; Iron; Membrane; Metal-binding;
Mitochondrion; Mitochondrion inner membrane; Respiratory chain;
Transmembrane; Transmembrane helix; Transport; Ubiquinone.
CHAIN 1 381 Cytochrome b.
/FTId=PRO_0000060861.
TRANSMEM 33 53 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 77 98 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 113 133 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 178 198 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 226 246 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 288 308 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 320 340 Helical. {ECO:0000250|UniProtKB:P00157}.
TRANSMEM 347 367 Helical. {ECO:0000250|UniProtKB:P00157}.
METAL 83 83 Iron 1 (heme b562 axial ligand).
{ECO:0000250|UniProtKB:P00157}.
METAL 97 97 Iron 2 (heme b566 axial ligand).
{ECO:0000250|UniProtKB:P00157}.
METAL 182 182 Iron 1 (heme b562 axial ligand).
{ECO:0000250|UniProtKB:P00157}.
METAL 196 196 Iron 2 (heme b566 axial ligand).
{ECO:0000250|UniProtKB:P00157}.
BINDING 201 201 Ubiquinone.
{ECO:0000250|UniProtKB:P00157}.
SEQUENCE 381 AA; 42888 MW; 194E4ED975C43C44 CRC64;
MINMRKTHPL LKIINHSFID LPAPSNISAW WNFGSLLGVC LIIQILTGLF LAMHYTSDTL
TAFSSVAHIC RDVNHGWLLR NLHANGASMF FMCLFLHVGR GIYYGSYLYK ETWNIGVILL
LTVMATAFVG YVLPWGQMSF WGATVITNLL SAIPYIGTTL AEWIWGGFAV DKATLTRFFA
FHFILPFIIM ALAIVHLLFL HETGSNNPSG INPDSDKIPF HPYYTIKDAL GFMLLLLMLL
LLALFSPDLL GDPDNFSPAN PLNTPPHIKP EWYFLFAYAI LRSIPNKLGG VLALLASILI
LLIIPLLHTA NQRSMMFRPI SQTLFWILTA NLITLTWIGG QPVEQPFIII GQLASMLYFT
LILILMPLAG LFENYMLKPK W


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