ID   Q6R701_HUMAN            Unreviewed;       119 AA.
AC   Q6R701;
DT   05-JUL-2004, integrated into UniProtKB/TrEMBL.
DT   05-JUL-2004, sequence version 1.
DT   27-MAR-2024, entry version 93.
DE   RecName: Full=Cytochrome b {ECO:0000256|ARBA:ARBA00013531};
DE   AltName: Full=Complex III subunit 3 {ECO:0000256|ARBA:ARBA00031681};
DE   AltName: Full=Complex III subunit III {ECO:0000256|ARBA:ARBA00032600};
DE   AltName: Full=Cytochrome b-c1 complex subunit 3 {ECO:0000256|ARBA:ARBA00029812};
DE   AltName: Full=Ubiquinol-cytochrome-c reductase complex cytochrome b subunit {ECO:0000256|ARBA:ARBA00032818};
DE   Flags: Fragment;
GN   Name=cytb {ECO:0000313|EMBL:AAS75185.1};
OS   Homo sapiens (Human).
OG   Mitochondrion {ECO:0000313|EMBL:AAS75185.1}.
OC   Eukaryota; Metazoa; Chordata; Craniata; Vertebrata; Euteleostomi; Mammalia;
OC   Eutheria; Euarchontoglires; Primates; Haplorrhini; Catarrhini; Hominidae;
OC   Homo.
OX   NCBI_TaxID=9606 {ECO:0000313|EMBL:AAS75185.1};
RN   [1] {ECO:0000313|EMBL:AAS75185.1}
RP   NUCLEOTIDE SEQUENCE.
RC   STRAIN=HOSA {ECO:0000313|EMBL:AAS75185.1};
RX   PubMed=16119557; DOI=10.1603/0022-2585(2005)042[0657:IOMBSB]2.0.CO;2;
RA   Meece J.K., Reynolds C.E., Stockwell P.J., Christensen J.E., Reed K.D.;
RT   "Identification of mosquito bloodmeal source by terminal restriction
RT   fragment length polymorphism profile analysis of the cytochrome B gene.";
RL   J. Med. Entomol. 42:657-667(2005).
RN   [2] {ECO:0000313|EMBL:AII19504.1}
RP   NUCLEOTIDE SEQUENCE.
RA   Senanayake S.C., Karunaweera N.D., Dotson E.M.;
RT   "Characteristics of phlebotomine sandflies in selected areas of Sri
RT   Lanka.";
RL   Submitted (MAY-2014) to the EMBL/GenBank/DDBJ databases.
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:0000256|ARBA:ARBA00002566}.
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:0000256|ARBA:ARBA00011088}.
CC   -!- SUBCELLULAR LOCATION: Membrane {ECO:0000256|ARBA:ARBA00004141}; Multi-
CC       pass membrane protein {ECO:0000256|ARBA:ARBA00004141}. Mitochondrion
CC       inner membrane {ECO:0000256|ARBA:ARBA00004448}; Multi-pass membrane
CC       protein {ECO:0000256|ARBA:ARBA00004448}.
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DR   EMBL; AY509658; AAS75185.1; -; Genomic_DNA.
DR   EMBL; KJ801974; AII19504.1; -; Genomic_DNA.
DR   AlphaFoldDB; Q6R701; -.
DR   PeptideAtlas; Q6R701; -.
DR   ChiTaRS; CYTB; human.
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; cd00284; Cytochrome_b_N; 1.
DR   InterPro; IPR005797; Cyt_b/b6_N.
DR   InterPro; IPR027387; Cytb/b6-like_sf.
DR   InterPro; IPR048259; Cytochrome_b_N_euk/bac.
DR   InterPro; IPR016174; Di-haem_cyt_TM.
DR   PANTHER; PTHR19271; CYTOCHROME B; 1.
DR   PANTHER; PTHR19271:SF16; CYTOCHROME B; 1.
DR   Pfam; PF00033; Cytochrome_B; 1.
DR   SUPFAM; SSF81342; Transmembrane di-heme cytochromes; 1.
DR   PROSITE; PS51002; CYTB_NTER; 1.
PE   4: Predicted;
KW   Electron transport {ECO:0000256|ARBA:ARBA00022982};
KW   Heme {ECO:0000256|ARBA:ARBA00022617}; Iron {ECO:0000256|ARBA:ARBA00023004};
KW   Membrane {ECO:0000256|ARBA:ARBA00023136, ECO:0000256|SAM:Phobius};
KW   Metal-binding {ECO:0000256|ARBA:ARBA00022723};
KW   Mitochondrion {ECO:0000256|ARBA:ARBA00023128, ECO:0000313|EMBL:AAS75185.1};
KW   Mitochondrion inner membrane {ECO:0000256|ARBA:ARBA00022792};
KW   Respiratory chain {ECO:0000256|ARBA:ARBA00022660};
KW   Transmembrane {ECO:0000256|ARBA:ARBA00022692, ECO:0000256|SAM:Phobius};
KW   Transmembrane helix {ECO:0000256|ARBA:ARBA00022989,
KW   ECO:0000256|SAM:Phobius}; Transport {ECO:0000256|ARBA:ARBA00022448};
KW   Ubiquinone {ECO:0000256|ARBA:ARBA00023075}.
FT   TRANSMEM        6..33
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|SAM:Phobius"
FT   TRANSMEM        54..75
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|SAM:Phobius"
FT   TRANSMEM        90..110
FT                   /note="Helical"
FT                   /evidence="ECO:0000256|SAM:Phobius"
FT   DOMAIN          1..119
FT                   /note="Cytochrome b/b6 N-terminal region profile"
FT                   /evidence="ECO:0000259|PROSITE:PS51002"
FT   NON_TER         1
FT                   /evidence="ECO:0000313|EMBL:AAS75185.1"
FT   NON_TER         119
FT                   /evidence="ECO:0000313|EMBL:AAS75185.1"
SQ   SEQUENCE   119 AA;  13345 MW;  2D61E731D1A63536 CRC64;
     PSNISAWWNF GSLLGACLIL QITTGLFLAM HYSPDASTAF SSIAHITRDV NYGWIIRYLH
     ANGASMFFIC LFLHIGRGLY YGSFLYSETW NIGIILLLAT MATAFMGYVL PWGQMSFWG
//