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CYB_PYTRG
ID   CYB_PYTRG               Reviewed;         371 AA.
AC   O48109;
DT   01-JUN-2001, integrated into UniProtKB/Swiss-Prot.
DT   01-JUN-1998, sequence version 1.
DT   03-AUG-2022, entry version 93.
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   Python regius (Ball python) (Boa regia).
OG   Mitochondrion.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi;
OC   Lepidosauria; Squamata; Bifurcata; Unidentata; Episquamata; Toxicofera;
OC   Serpentes; Henophidia; Pythonidae; Python.
OX   NCBI_TaxID=51751;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RA   Campbell B.N.;
RT   "Hic Sunt Serpentes -- molecular phylogenetics and the Boidae (Serpentes:
RT   Booidea).";
RL   Thesis (1997), Queen's University / Kingston, Canada.
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 3 respiratory subunits
CC       (MT-CYB, CYC1 and UQCRFS1), 2 core proteins (UQCRC1 and UQCRC2) and
CC       probably 6 low-molecular weight proteins.
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; U69856; AAC01890.1; -; Genomic_DNA.
DR   AlphaFoldDB; O48109; -.
DR   SMR; O48109; -.
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..371
FT                   /note="Cytochrome b"
FT                   /id="PRO_0000061477"
FT   TRANSMEM        25..45
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        69..90
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        105..125
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        170..190
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        218..238
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        280..300
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        312..332
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   TRANSMEM        339..358
FT                   /note="Helical"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
FT   BINDING         75
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         89
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         174
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         188
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         193
FT                   /ligand="a ubiquinone"
FT                   /ligand_id="ChEBI:CHEBI:16389"
FT                   /evidence="ECO:0000250|UniProtKB:P00157"
SQ   SEQUENCE   371 AA;  41826 MW;  8FBEE4CE229F3D3B CRC64;
     MPHHYILTLF GLLPVATNIS TWWNFGSMLL TCLMLQVLTG FFLAVHYTAN INLAFSSIIH
     ITRDVPYGWL MQNLHAIGAS MFFICIYIHI ARGLYYGSHL NKETWMSGIT LLITLIATAF
     FGYVLPGGQM SFRAATGITN LLTAVPYLGA TMTTWLWGGF AINDPTLTRF FALHFILPFA
     IISLSSLHII LLHEEGSSNP LGTNPDIDKI PFHPYHSYKD LLLLTLMLLT LMITVSFFPD
     IFNDPDNFSK ANPLVTPQHI KPEWYFLFAY GILRSIPNKL GGALALVMSI MILLTAPLTH
     TAHLRPMTFR PLSQLMFWTL ISTFITITWA ATKPVEPPYI IISQTTATLY FTFFISTPIL
     GWIENKMMNS C
 
 
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