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Entry version 135 (23 Feb 2022)
Sequence version 1 (01 Nov 1998)
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Protein

Squalene epoxidase 2, mitochondrial

Gene

SQE2

Organism
Arabidopsis thaliana (Mouse-ear cress)
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

Catalyzes the stereospecific oxidation of squalene to (S)-2,3-epoxysqualene, and is considered to be a rate-limiting enzyme in steroid biosynthesis. Produces primarily oxidosqualene.

1 Publication

<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

FADBy similarity

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section describes the metabolic pathway(s) associated with a protein.<p><a href='/help/pathway' target='_top'>More...</a></p>Pathwayi: lanosterol biosynthesis

This protein is involved in step 2 of the subpathway that synthesizes lanosterol from farnesyl diphosphate. This subpathway is part of the pathway lanosterol biosynthesis, which is itself part of Terpene metabolism.
View all proteins of this organism that are known to be involved in the subpathway that synthesizes lanosterol from farnesyl diphosphate, the pathway lanosterol biosynthesis and in Terpene metabolism.

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 sitei160FADBy similarity1
<p>This subsection describes interesting single amino acid sites on the sequence that are not defined in any other subsection. This subsection can be displayed in different sections ('Function', 'PTM / Processing', 'Pathology and Biotech') according to its content.<p><a href='/help/site' target='_top'>More...</a></p>Sitei194Important for enzyme activityBy similarity1
Binding sitei231FADBy similarity1
Binding sitei247FAD; via amide nitrogen and carbonyl oxygenBy similarity1
Binding sitei409FADBy similarity1
Binding sitei422FAD; via amide nitrogenBy similarity1

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 bindingi132 – 133FADBy similarity2
Nucleotide bindingi152 – 153FADBy similarity2

<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

Enzyme and pathway databases

BRENDA Comprehensive Enzyme Information System

More...
BRENDAi
1.14.14.17, 399

UniPathway: a resource for the exploration and annotation of metabolic pathways

More...
UniPathwayi
UPA00767;UER00752

<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:
Squalene epoxidase 2, mitochondrial (EC:1.14.14.171 Publication)
Short name:
AtSQE2
<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:SQE2
Ordered Locus Names:At2g22830
ORF Names:T20K9.4
<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>OrganismiArabidopsis thaliana (Mouse-ear cress)
<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 identifieri3702 [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 lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliopsidaeudicotyledonsGunneridaePentapetalaerosidsmalvidsBrassicalesBrassicaceaeCamelineaeArabidopsis
<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
  • UP000006548 <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 2

Organism-specific databases

Arabidopsis Information Portal

More...
Araporti
AT2G22830

The Arabidopsis Information Resource

More...
TAIRi
locus:2059196, AT2G22830

<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>Transmembranei70 – 90HelicalSequence analysisAdd BLAST21
Transmembranei493 – 513HelicalSequence analysisAdd BLAST21
Transmembranei520 – 540HelicalSequence analysisAdd BLAST21
Transmembranei545 – 565HelicalSequence analysisAdd BLAST21

Keywords - Cellular componenti

Membrane, Mitochondrion

<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 transit peptide.<p><a href='/help/transit' target='_top'>More...</a></p>Transit peptidei1 – 45MitochondrionSequence analysisAdd BLAST45
<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_000042276446 – 585Squalene epoxidase 2, mitochondrialAdd BLAST540

Proteomic databases

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

More...
PaxDbi
O81000

ProteomicsDB: a multi-organism proteome resource

More...
ProteomicsDBi
220574

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

<p>This subsection of the 'Expression' section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms. By default, the information is derived from experiments at the mRNA level, unless specified 'at protein level'.<br></br>Examples: <a href="http://www.uniprot.org/uniprot/P92958#expression">P92958</a>, <a href="http://www.uniprot.org/uniprot/Q8TDN4#expression">Q8TDN4</a>, <a href="http://www.uniprot.org/uniprot/O14734#expression">O14734</a><p><a href='/help/tissue_specificity' target='_top'>More...</a></p>Tissue specificityi

Expressed mainly in inflorescences. Detected in seedlings, leaves, stems, and siliques.1 Publication

Gene expression databases

ExpressionAtlas, Differential and Baseline Expression

More...
ExpressionAtlasi
O81000, baseline and differential

Genevisible search portal to normalized and curated expression data from Genevestigator

More...
Genevisiblei
O81000, AT

<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

Protein-protein interaction databases

STRING: functional protein association networks

More...
STRINGi
3702.AT2G22830.1

<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
O81000

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 squalene monooxygenase family.Curated

Keywords - Domaini

Transit peptide, Transmembrane, Transmembrane helix

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
KOG1298, Eukaryota

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
CLU_026390_1_0_1

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
O81000

Identification of Orthologs from Complete Genome Data

More...
OMAi
DRKDDAN

Database of Orthologous Groups

More...
OrthoDBi
583514at2759

Database for complete collections of gene phylogenies

More...
PhylomeDBi
O81000

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
3.50.50.60, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR036188, FAD/NAD-bd_sf
IPR013698, Squalene_epoxidase
IPR040125, Squalene_monox

The PANTHER Classification System

More...
PANTHERi
PTHR10835, PTHR10835, 1 hit

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF08491, SE, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF51905, SSF51905, 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.

<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 in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

O81000-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MKPFVIRNLP RFQSTLRSSL LYTNHRPSSR FSLSTRRFTT GATYIRRWKA
60 70 80 90 100
TAAQTLKLSA VNSTVMMKPA KIALDQFIAS LFTFLLLYIL RRSSNKNKKN
110 120 130 140 150
RGLVVSQNDT VSKNLETEVD SGTDVIIVGA GVAGSALAHT LGKEGRRVHV
160 170 180 190 200
IERDFSEQDR IVGELLQPGG YLKLIELGLE DCVKKIDAQR VLGYVLFKDG
210 220 230 240 250
KHTKLAYPLE TFDSDVAGRS FHNGRFVQRM REKALTLSNV RLEQGTVTSL
260 270 280 290 300
LEEHGTIKGV RYRTKEGNEF RSFAPLTIVC DGCFSNLRRS LCKPKVDVPS
310 320 330 340 350
TFVGLVLENC ELPFANHGHV VLGDPSPILM YPISSSEVRC LVDVPGQKLP
360 370 380 390 400
PIANGEMAKY LKTRVAPQVP TKVREAFITA VEKGNIRTMP NRSMPADPIP
410 420 430 440 450
TPGALLLGDA FNMRHPLTGG GMTVALADIV VLRDLLRPIR NLNDKEALSK
460 470 480 490 500
YIESFYTLRK PVASTINTLA DALYKVFLAS SDEARTEMRE ACFDYLSLGG
510 520 530 540 550
VFSSGPVALL SGLNPRPLSL VLHFFAVAIY AVCRLMLPFP SIESFWLGAR
560 570 580
IISSASSIIF PIIKAEGVRQ MFFPRTIPAI YRAPP
Length:585
Mass (Da):64,792
Last modified:November 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:iD2259095A99B8B3C
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
AC004786 Genomic DNA Translation: AAC32430.1
CP002685 Genomic DNA Translation: AEC07362.1

Protein sequence database of the Protein Information Resource

More...
PIRi
D84617

NCBI Reference Sequences

More...
RefSeqi
NP_179868.1, NM_127848.4

Genome annotation databases

Ensembl plant genome annotation project

More...
EnsemblPlantsi
AT2G22830.1; AT2G22830.1; AT2G22830

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
816814

Gramene; a comparative resource for plants

More...
Gramenei
AT2G22830.1; AT2G22830.1; AT2G22830

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ath:AT2G22830

<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
AC004786 Genomic DNA Translation: AAC32430.1
CP002685 Genomic DNA Translation: AEC07362.1
PIRiD84617
RefSeqiNP_179868.1, NM_127848.4

3D structure databases

SMRiO81000
ModBaseiSearch...

Protein-protein interaction databases

STRINGi3702.AT2G22830.1

Proteomic databases

PaxDbiO81000
ProteomicsDBi220574

Genome annotation databases

EnsemblPlantsiAT2G22830.1; AT2G22830.1; AT2G22830
GeneIDi816814
GrameneiAT2G22830.1; AT2G22830.1; AT2G22830
KEGGiath:AT2G22830

Organism-specific databases

AraportiAT2G22830
TAIRilocus:2059196, AT2G22830

Phylogenomic databases

eggNOGiKOG1298, Eukaryota
HOGENOMiCLU_026390_1_0_1
InParanoidiO81000
OMAiDRKDDAN
OrthoDBi583514at2759
PhylomeDBiO81000

Enzyme and pathway databases

UniPathwayiUPA00767;UER00752
BRENDAi1.14.14.17, 399

Miscellaneous databases

Protein Ontology

More...
PROi
PR:O81000

Gene expression databases

ExpressionAtlasiO81000, baseline and differential
GenevisibleiO81000, AT

Family and domain databases

Gene3Di3.50.50.60, 1 hit
InterProiView protein in InterPro
IPR036188, FAD/NAD-bd_sf
IPR013698, Squalene_epoxidase
IPR040125, Squalene_monox
PANTHERiPTHR10835, PTHR10835, 1 hit
PfamiView protein in Pfam
PF08491, SE, 1 hit
SUPFAMiSSF51905, SSF51905, 1 hit

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 nameiERG15_ARATH
<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: O81000
<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: June 26, 2013
Last sequence update: November 1, 1998
Last modified: February 23, 2022
This is version 135 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 programPlant 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. Arabidopsis thaliana
    Arabidopsis thaliana: entries and gene names
  2. PATHWAY comments
    Index of metabolic and biosynthesis pathways
  3. SIMILARITY comments
    Index of protein domains and families
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