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Entry version 125 (17 Jun 2020)
Sequence version 1 (01 Nov 1999)
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Protein

Cytochrome bc1 complex cytochrome b subunit

Gene

qcrB

Organism
Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)
Status
Reviewed-Annotation score:

Annotation score:3 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
-Protein inferred from homologyi <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Cytochrome b subunit of the cytochrome bc1 complex, an essential component of the respiratory electron transport chain required for ATP synthesis. The bc1 complex catalyzes the oxidation of ubiquinol and the reduction of cytochrome c in the respiratory chain. The bc1 complex operates through a Q-cycle mechanism that couples electron transfer to generation of the proton gradient that drives ATP synthesis. The cytochrome b subunit contains two ubiquinol reactive sites: the oxidation (QP) site and the reduction (QN) site.By similarity

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

<p>This subsection of the 'Function' section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

hemeBy similarityNote: Binds 2 heme groups non-covalently per subunit.By similarity

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section indicates at which position the protein binds a given metal ion. The nature of the metal is indicated in the 'Description' field.<p><a href='/help/metal' target='_top'>More...</a></p>Metal bindingi118Iron (heme 1 axial ligand)PROSITE-ProRule annotation1
Metal bindingi132Iron (heme 2 axial ligand)PROSITE-ProRule annotation1
Metal bindingi219Iron (heme 1 axial ligand)PROSITE-ProRule annotation1
Metal bindingi234Iron (heme 2 axial ligand)PROSITE-ProRule annotation1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

GO - Biological processi

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionTranslocase
Biological processElectron transport, Respiratory chain, Transport
LigandHeme, Iron, Metal-binding

Protein family/group databases

Transport Classification Database

More...
TCDBi
3.D.3.5.4 the proton-translocating quinol:cytochrome c reductase (qcr) superfamily

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Cytochrome bc1 complex cytochrome b subunit (EC:7.1.1.8By similarity)
Alternative name(s):
Cytochrome bc1 reductase complex subunit QcrB
Ubiquinol--cytochrome c reductase cytochrome b subunit
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:qcrB
Ordered Locus Names:SCO2148
ORF Names:SC6G10.21c
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiStreptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri100226 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiBacteriaActinobacteriaStreptomycetalesStreptomycetaceaeStreptomycesStreptomyces albidoflavus group
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000001973 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Topology

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/subcellular%5Flocation%5Fsection">'Subcellular location'</a> section describes the extent of a membrane-spanning region of the protein. It denotes the presence of both alpha-helical transmembrane regions and the membrane spanning regions of beta-barrel transmembrane proteins.<p><a href='/help/transmem' target='_top'>More...</a></p>Transmembranei54 – 74HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei122 – 142HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei150 – 170HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei182 – 202HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei220 – 240HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei269 – 289HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei335 – 355HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei385 – 405HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei413 – 433HelicalPROSITE-ProRule annotationAdd BLAST21

GO - Cellular componenti

Keywords - Cellular componenti

Cell membrane, Membrane

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00000619281 – 545Cytochrome bc1 complex cytochrome b subunitAdd BLAST545

Proteomic databases

PRoteomics IDEntifications database

More...
PRIDEi
Q9X806

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

The cytochrome bc1 complex is composed of a cytochrome b (QcrB), the Rieske iron-sulfur protein (QcrA) and a diheme cytochrome c (QcrC) subunit.

By similarity

Protein-protein interaction databases

STRING: functional protein association networks

More...
STRINGi
100226.SCO2148

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the cytochrome b family.PROSITE-ProRule annotation

Keywords - Domaini

Transmembrane, Transmembrane helix

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG4105DJ5 Bacteria
COG1290 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
CLU_031114_2_0_11

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
Q9X806

KEGG Orthology (KO)

More...
KOi
K03891

Identification of Orthologs from Complete Genome Data

More...
OMAi
NYGPYDP

Database for complete collections of gene phylogenies

More...
PhylomeDBi
Q9X806

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
1.20.810.10, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR005797 Cyt_b/b6_N
IPR027387 Cytb/b6-like_sf
IPR016174 Di-haem_cyt_TM

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF13631 Cytochrom_B_N_2, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF81342 SSF81342, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS51002 CYTB_NTER, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

Q9X806-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MSTAANEPSR SRGKAPAGER VADWADGRLG IYSLAKANMR KIFPDHWSFM
60 70 80 90 100
LGEVCLYSFI IIILTGVYLT LFFHPSMAEV EYHGSYVPLQ GQMMSEAYAS
110 120 130 140 150
TLDISFDVRG GLLIRQIHHW AALIFLAGMF VHMMRVFFTG AFRKPREVNW
160 170 180 190 200
LFGFLLLVLG MFTGFTGYSL PDDLLSGTGI RFMEGAILSV PIVGTYISFF
210 220 230 240 250
LFGGEFPGHD FVSRFYSIHI LLLPGIMLGL LVGHLILVFY HKHTQFAGPG
260 270 280 290 300
KTNKNVVGMP LLPVYTAKAG GFFFLVFGVI SVVSAIATIN PIWAIGPYRP
310 320 330 340 350
DQVSTGAQPD WYMGFSEGLI RVMPGWEINA WGHTLVLGVF VPLLIFPLVL
360 370 380 390 400
AAIAVYPFIE SWVTGDKREH HILDRPRNAP TRTAFGVAWL TVYFVLLIGG
410 420 430 440 450
GNDLWATHFH LSINAITWFV RIAFFVGPVV AFIATKRICL GLQRRDKDKV
460 470 480 490 500
LHGRESGIIK RLPHGEFIEV HEPLSQEQLH TLTAHEQYQP AEIGPTVDEN
510 520 530 540
GVERKVSGTQ KLRAKLSESY YGEESQIPKP TVEEYKEITS GHGHH
Length:545
Mass (Da):60,886
Last modified:November 1, 1999 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i313BBB4CA0CDC91F
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

More...
GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
AL939111 Genomic DNA Translation: CAB39875.1

Protein sequence database of the Protein Information Resource

More...
PIRi
T35530

NCBI Reference Sequences

More...
RefSeqi
NP_626404.1, NC_003888.3
WP_011028167.1, NZ_VNID01000001.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
CAB39875; CAB39875; CAB39875

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
1097582

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
sco:SCO2148

Pathosystems Resource Integration Center (PATRIC)

More...
PATRICi
fig|100226.15.peg.2183

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AL939111 Genomic DNA Translation: CAB39875.1
PIRiT35530
RefSeqiNP_626404.1, NC_003888.3
WP_011028167.1, NZ_VNID01000001.1

3D structure databases

Database of comparative protein structure models

More...
ModBasei
Search...

SWISS-MODEL Interactive Workspace

More...
SWISS-MODEL-Workspacei
Submit a new modelling project...

Protein-protein interaction databases

STRINGi100226.SCO2148

Protein family/group databases

TCDBi3.D.3.5.4 the proton-translocating quinol:cytochrome c reductase (qcr) superfamily

Proteomic databases

PRIDEiQ9X806

Genome annotation databases

EnsemblBacteriaiCAB39875; CAB39875; CAB39875
GeneIDi1097582
KEGGisco:SCO2148
PATRICifig|100226.15.peg.2183

Phylogenomic databases

eggNOGiENOG4105DJ5 Bacteria
COG1290 LUCA
HOGENOMiCLU_031114_2_0_11
InParanoidiQ9X806
KOiK03891
OMAiNYGPYDP
PhylomeDBiQ9X806

Family and domain databases

Gene3Di1.20.810.10, 1 hit
InterProiView protein in InterPro
IPR005797 Cyt_b/b6_N
IPR027387 Cytb/b6-like_sf
IPR016174 Di-haem_cyt_TM
PfamiView protein in Pfam
PF13631 Cytochrom_B_N_2, 1 hit
SUPFAMiSSF81342 SSF81342, 1 hit
PROSITEiView protein in PROSITE
PS51002 CYTB_NTER, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiQCRB_STRCO
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: Q9X806
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: May 30, 2000
Last sequence update: November 1, 1999
Last modified: June 17, 2020
This is version 125 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families
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