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Entry version 119 (26 Feb 2020)
Sequence version 1 (01 Aug 1998)
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Protein

Sulfide-quinone reductase

Gene

sqr

Organism
Aquifex aeolicus (strain VF5)
Status
Reviewed-Annotation score:

Annotation score:5 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

Catalyzes the oxidation of hydrogen sulfide, with the help of a quinone. Consecutive reaction cycles lead to the accumulation of a polysulfide product on the active site Cys residues; these products are released when they exceed a critical length, typically as cyclooctasulfur.2 Publications

<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

FAD1 PublicationNote: Binds 1 FAD per subunit.1 Publication

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei105FAD; via carbonyl oxygen1 Publication1
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section is used for enzymes and indicates the residues directly involved in catalysis.<p><a href='/help/act_site' target='_top'>More...</a></p>Active sitei156Cysteine persulfide intermediate1 PublicationBy similarity1
Binding sitei294FAD; via amide nitrogen1 Publication1
Binding sitei314FAD; via amide nitrogen1 Publication1
Binding sitei346Quinone; via carbonyl oxygen1 Publication1
Active sitei347Cysteine persulfide intermediate1 PublicationBy similarity1
Binding sitei382FAD1 Publication1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.<p><a href='/help/np_bind' target='_top'>More...</a></p>Nucleotide bindingi9 – 13FAD1 Publication5
Nucleotide bindingi34 – 36FAD1 Publication3
Nucleotide bindingi42 – 43FAD1 Publication2

<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 functionOxidoreductase
LigandFAD, Flavoprotein, Nucleotide-binding

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...
BioCyci
AAEO224324:G1G15-1562-MONOMER

BRENDA Comprehensive Enzyme Information System

More...
BRENDAi
1.8.5.4 396

<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:
Sulfide-quinone reductase (EC:1.8.5.42 Publications)
Short name:
SQR
Alternative name(s):
Sulfide:quinone oxidoreductase2 Publications
<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:sqrImported
Ordered Locus Names:aq_2186Imported
<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>OrganismiAquifex aeolicus (strain VF5)Imported
<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 identifieri224324 [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 lineageiBacteriaAquificaeAquificalesAquificaceaeAquifex
<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
  • UP000000798 <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

GO - Cellular componenti

Keywords - Cellular componenti

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

Chemistry databases

Drug and drug target database

More...
DrugBanki
DB07640 2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione

<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_00004308241 – 430Sulfide-quinone reductaseAdd BLAST430

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the PTM / Processing":/help/ptm_processing_section section describes the positions of cysteine residues participating in disulfide bonds.<p><a href='/help/disulfid' target='_top'>More...</a></p>Disulfide bondi280 ↔ 4221 Publication
Disulfide bondi419 ↔ 4301 Publication

Keywords - PTMi

Disulfide bond, Quinone

<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

Homotrimer.

1 Publication

<p>This subsection of the '<a href="http://www.uniprot.org/help/interaction%5Fsection%27">Interaction</a> section provides information about binary protein-protein interactions. The data presented in this section are a quality-filtered subset of binary interactions automatically derived from the <a href="http://www.ebi.ac.uk/intact/">IntAct database</a>. It is updated on a monthly basis. Each binary interaction is displayed on a separate line.<p><a href='/help/binary_interactions' target='_top'>More...</a></p>Binary interactionsi

WithEntry#Exp.IntActNotes
itself2EBI-15785206,EBI-15785206

GO - Molecular functioni

Protein-protein interaction databases

Database of interacting proteins

More...
DIPi
DIP-48896N

STRING: functional protein association networks

More...
STRINGi
224324.aq_2186

<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

Secondary structure

1430
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

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

More...
SMRi
O67931

Database of comparative protein structure models

More...
ModBasei
Search...

Protein Data Bank in Europe - Knowledge Base

More...
PDBe-KBi
Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...
EvolutionaryTracei
O67931

<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 SQRD family.Curated

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG4107SA8 Bacteria
COG0446 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
CLU_030742_5_2_0

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
O67931

KEGG Orthology (KO)

More...
KOi
K17218

Identification of Orthologs from Complete Genome Data

More...
OMAi
TGFMIES

Database of Orthologous Groups

More...
OrthoDBi
403436at2

Family and domain databases

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR036188 FAD/NAD-bd_sf
IPR023753 FAD/NAD-binding_dom

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF07992 Pyr_redox_2, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF51905 SSF51905, 2 hits

<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.

O67931-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MAKHVVVIGG GVGGIATAYN LRNLMPDLKI TLISDRPYFG FTPAFPHLAM
60 70 80 90 100
GWRKFEDISV PLAPLLPKFN IEFINEKAES IDPDANTVTT QSGKKIEYDY
110 120 130 140 150
LVIATGPKLV FGAEGQEENS TSICTAEHAL ETQKKLQELY ANPGPVVIGA
160 170 180 190 200
IPGVSCFGPA YEFALMLHYE LKKRGIRYKV PMTFITSEPY LGHFGVGGIG
210 220 230 240 250
ASKRLVEDLF AERNIDWIAN VAVKAIEPDK VIYEDLNGNT HEVPAKFTMF
260 270 280 290 300
MPSFQGPEVV ASAGDKVANP ANKMVIVNRC FQNPTYKNIF GVGVVTAIPP
310 320 330 340 350
IEKTPIPTGV PKTGMMIEQM AMAVAHNIVN DIRNNPDKYA PRLSAICIAD
360 370 380 390 400
FGEDAGFFFA DPVIPPRERV ITKMGKWAHY FKTAFEKYFL WKVRNGNIAP
410 420 430
SFEEKVLEIF LKVHPIELCK DCEGAPGSRC
Length:430
Mass (Da):47,449
Last modified:August 1, 1998 - 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:i7489B07FADEAA9A8
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
AE000657 Genomic DNA Translation: AAC07903.1

Protein sequence database of the Protein Information Resource

More...
PIRi
G70487

NCBI Reference Sequences

More...
RefSeqi
NP_214500.1, NC_000918.1
WP_010881436.1, NC_000918.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
AAC07903; AAC07903; aq_2186

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
1193920

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
aae:aq_2186

<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
AE000657 Genomic DNA Translation: AAC07903.1
PIRiG70487
RefSeqiNP_214500.1, NC_000918.1
WP_010881436.1, NC_000918.1

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...
PDBei

Protein Data Bank RCSB

More...
RCSB PDBi

Protein Data Bank Japan

More...
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
3HYVX-ray2.30A/B/C/D/E/F1-430[»]
3HYWX-ray2.00A/B/C/D/E/F1-430[»]
3HYXX-ray2.90A/B/C/D/E/F1-430[»]
SMRiO67931
ModBaseiSearch...
PDBe-KBiSearch...

Protein-protein interaction databases

DIPiDIP-48896N
STRINGi224324.aq_2186

Chemistry databases

DrugBankiDB07640 2-decyl-5,6-dimethoxy-3-methylcyclohexa-2,5-diene-1,4-dione

Genome annotation databases

EnsemblBacteriaiAAC07903; AAC07903; aq_2186
GeneIDi1193920
KEGGiaae:aq_2186

Phylogenomic databases

eggNOGiENOG4107SA8 Bacteria
COG0446 LUCA
HOGENOMiCLU_030742_5_2_0
InParanoidiO67931
KOiK17218
OMAiTGFMIES
OrthoDBi403436at2

Enzyme and pathway databases

BioCyciAAEO224324:G1G15-1562-MONOMER
BRENDAi1.8.5.4 396

Miscellaneous databases

EvolutionaryTraceiO67931

Family and domain databases

InterProiView protein in InterPro
IPR036188 FAD/NAD-bd_sf
IPR023753 FAD/NAD-binding_dom
PfamiView protein in Pfam
PF07992 Pyr_redox_2, 1 hit
SUPFAMiSSF51905 SSF51905, 2 hits

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 nameiSQRD_AQUAE
<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: O67931
<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: October 29, 2014
Last sequence update: August 1, 1998
Last modified: February 26, 2020
This is version 119 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

3D-structure, Reference proteome

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families
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