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Entry version 29 (18 Sep 2019)
Sequence version 1 (16 Apr 2014)
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Protein

Cytochrome bc1 complex cytochrome b subunit

Gene

qcrB

Organism
Mycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
Status
Reviewed-Annotation score:

Annotation score:4 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>
-Experimental evidence at protein leveli <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.Curated

Miscellaneous

Was identified as a high-confidence drug target.1 Publication

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section describes regulatory mechanisms for enzymes, transporters or microbial transcription factors, and reports the components which regulate (by activation or inhibition) the reaction.<p><a href='/help/activity_regulation' target='_top'>More...</a></p>Activity regulationi

Inhibited by the anti-tuberculous drug Q203, an optimized imidazopyridine amide (IPA) compound. Q203 triggers a rapid ATP depletion in M.tuberculosis grown under an aerobic or anaerobic atmosphere (PubMed:23913123). Also inhibited by LPZS (lansoprazole sulfide), a metabolite of LPZ (lansoprazole) generated by intracellular sulfoxide reduction into the host cytoplasm; LPZS is a potent anti-mycobacterial agent that inhibits growth of intracellular M.tuberculosis with good activity against drug-resistant isolates. The inhibition of QcrB by LPZS leads to disruption of the mycobacterial respiratory chain and massive and rapid ATP depletion (PubMed:26158909). Both compounds target the same active site in QcrB (the ubiquinol oxidation QP site), but they have distinct drug-binding mechanisms (PubMed:26158909).2 Publications

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">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 bindingi114Iron (heme 1 axial ligand)PROSITE-ProRule annotation1
Metal bindingi128Iron (heme 2 axial ligand)PROSITE-ProRule annotation1
Metal bindingi216Iron (heme 1 axial ligand)PROSITE-ProRule annotation1
Metal bindingi231Iron (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

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...
BioCyci
MTBH37RV:G185E-6406-MONOMER

<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_and_taxonomy_section">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:7.1.1.8Curated)
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_and_taxonomy_section">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:Rv2196
ORF Names:MTCY190.07
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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>OrganismiMycobacterium tuberculosis (strain ATCC 25618 / H37Rv)
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 identifieri83332 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 lineageiBacteriaActinobacteriaCorynebacterialesMycobacteriaceaeMycobacteriumMycobacterium tuberculosis complex
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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
  • UP000001584 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes_manual">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

Organism-specific databases

Mycobacterium tuberculosis strain H37Rv genome database

More...
TubercuListi
Rv2196

<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_location_section">'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>Transmembranei45 – 65HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei118 – 138HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei146 – 166HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei189 – 209HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei217 – 237HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei266 – 286HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei335 – 355HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei381 – 401HelicalPROSITE-ProRule annotationAdd BLAST21
Transmembranei418 – 438HelicalPROSITE-ProRule annotationAdd BLAST21

GO - Cellular componenti

Keywords - Cellular componenti

Cell membrane, Membrane

<p>This section provides information on the disease(s) and phenotype(s) associated with a protein.<p><a href='/help/pathology_and_biotech_section' target='_top'>More...</a></p>Pathology & Biotechi

Mutagenesis

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/manual/pathology_and_biotech_section">'Pathology and Biotech'</a> section describes the effect of the experimental mutation of one or more amino acid(s) on the biological properties of the protein.<p><a href='/help/mutagen' target='_top'>More...</a></p>Mutagenesisi176L → P: Confers resistance to LPZS. Remains susceptible to IPA. 1 Publication1
Mutagenesisi313T → A: Confers resistance to Q203 and IPA. Remains susceptible to LPZS. 2 Publications1

<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.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00000619271 – 549Cytochrome bc1 complex cytochrome b subunitAdd BLAST549

Proteomic databases

PaxDb, a database of protein abundance averages across all three domains of life

More...
PaxDbi
P9WP37

<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_section">'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_section">'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.

Curated

Protein-protein interaction databases

STRING: functional protein association networks

More...
STRINGi
83332.Rv2196

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...
SMRi
P9WP37

Database of comparative protein structure models

More...
ModBasei
Search...

<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

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
P9WP37

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_length">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_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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.

P9WP37-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MSPKLSPPNI GEVLARQAED IDTRYHPSAA LRRQLNKVFP THWSFLLGEI
60 70 80 90 100
ALYSFVVLLI TGVYLTLFFD PSMVDVTYNG VYQPLRGVEM SRAYQSALDI
110 120 130 140 150
SFEVRGGLFV RQIHHWAALM FAAAIMVHLA RIFFTGAFRR PRETNWVIGS
160 170 180 190 200
LLLILAMFEG YFGYSLPDDL LSGLGLRAAL SSITLGMPVI GTWLHWALFG
210 220 230 240 250
GDFPGTILIP RLYALHILLL PGIILALIGL HLALVWFQKH TQFPGPGRTE
260 270 280 290 300
HNVVGVRVMP VFAFKSGAFF AAIVGVLGLM GGLLQINPIW NLGPYKPSQV
310 320 330 340 350
SAGSQPDFYM MWTEGLARIW PPWEFYFWHH TIPAPVWVAV IMGLVFVLLP
360 370 380 390 400
AYPFLEKRFT GDYAHHNLLQ RPRDVPVRTA IGAMAIAFYM VLTLAAMNDI
410 420 430 440 450
IALKFHISLN ATTWIGRIGM VILPPFVYFI TYRWCIGLQR SDRSVLEHGV
460 470 480 490 500
ETGIIKRLPH GAYIELHQPL GPVDEHGHPI PLQYQGAPLP KRMNKLGSAG
510 520 530 540
SPGSGSFLFA DSAAEDAALR EAGHAAEQRA LAALREHQDS IMGSPDGEH
Length:549
Mass (Da):61,014
Last modified:April 16, 2014 - 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:i0E75E0BCAA46B3A7
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
AL123456 Genomic DNA Translation: CCP44973.1

Protein sequence database of the Protein Information Resource

More...
PIRi
E70784

NCBI Reference Sequences

More...
RefSeqi
NP_216712.1, NC_000962.3
WP_003899212.1, NZ_NVQJ01000008.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
CCP44973; CCP44973; Rv2196

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
887400

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
mtu:Rv2196
mtv:RVBD_2196

<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
AL123456 Genomic DNA Translation: CCP44973.1
PIRiE70784
RefSeqiNP_216712.1, NC_000962.3
WP_003899212.1, NZ_NVQJ01000008.1

3D structure databases

SMRiP9WP37
ModBaseiSearch...

Protein-protein interaction databases

STRINGi83332.Rv2196

Proteomic databases

PaxDbiP9WP37

Genome annotation databases

EnsemblBacteriaiCCP44973; CCP44973; Rv2196
GeneIDi887400
KEGGimtu:Rv2196
mtv:RVBD_2196

Organism-specific databases

TubercuListiRv2196

Phylogenomic databases

eggNOGiENOG4105DJ5 Bacteria
COG1290 LUCA
KOiK03891
OMAiNYGPYDP
PhylomeDBiP9WP37

Enzyme and pathway databases

BioCyciMTBH37RV:G185E-6406-MONOMER

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_MYCTU
<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: P9WP37
Secondary accession number(s): L0TAG7, P63885, Q10388
<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_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: April 16, 2014
Last sequence update: April 16, 2014
Last modified: September 18, 2019
This is version 29 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

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families
  2. Mycobacterium tuberculosis strains ATCC 25618 / H37Rv and CDC 1551 / Oshkosh
    Mycobacterium tuberculosis strains ATCC 25618 / H37Rv and CDC 1551 / Oshkosh: entries and gene names
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