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Protein

Insulin receptor substrate 2

Gene

IRS2

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

May mediate the control of various cellular processes by insulin.

GO - Molecular functioni

GO - Biological processi

  • brain development Source: Ensembl
  • cell proliferation Source: Ensembl
  • cellular response to glucose stimulus Source: Ensembl
  • cellular response to insulin stimulus Source: BHF-UCL
  • glucose metabolic process Source: ProtInc
  • insulin receptor signaling pathway Source: BHF-UCL
  • lipid homeostasis Source: BHF-UCL
  • mammary gland development Source: Ensembl
  • MAPK cascade Source: Reactome
  • negative regulation of B cell apoptotic process Source: BHF-UCL
  • negative regulation of kinase activity Source: BHF-UCL
  • negative regulation of plasma membrane long-chain fatty acid transport Source: BHF-UCL
  • phosphatidylinositol-mediated signaling Source: Reactome
  • positive regulation of B cell proliferation Source: BHF-UCL
  • positive regulation of cell migration Source: Ensembl
  • positive regulation of cell proliferation Source: BHF-UCL
  • positive regulation of fatty acid beta-oxidation Source: BHF-UCL
  • positive regulation of glucose import Source: BHF-UCL
  • positive regulation of glucose metabolic process Source: BHF-UCL
  • positive regulation of glycogen biosynthetic process Source: BHF-UCL
  • positive regulation of insulin secretion Source: BHF-UCL
  • positive regulation of mesenchymal cell proliferation Source: Ensembl
  • regulation of lipid metabolic process Source: BHF-UCL
  • regulation of phosphatidylinositol 3-kinase signaling Source: Reactome
  • response to glucose Source: BHF-UCL
  • signal transduction Source: ProtInc
Complete GO annotation...

Keywords - Molecular functioni

Transducer

Enzyme and pathway databases

BioCyciZFISH:G66-31355-MONOMER.
ReactomeiR-HSA-109704. PI3K Cascade.
R-HSA-112412. SOS-mediated signalling.
R-HSA-1257604. PIP3 activates AKT signaling.
R-HSA-198203. PI3K/AKT activation.
R-HSA-2219530. Constitutive Signaling by Aberrant PI3K in Cancer.
R-HSA-2428928. IRS-related events triggered by IGF1R.
R-HSA-2586552. Signaling by Leptin.
R-HSA-5673001. RAF/MAP kinase cascade.
R-HSA-6811558. PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling.
R-HSA-74713. IRS activation.
R-HSA-74749. Signal attenuation.
R-HSA-8853659. RET signaling.
R-HSA-982772. Growth hormone receptor signaling.
SignaLinkiQ9Y4H2.
SIGNORiQ9Y4H2.

Names & Taxonomyi

Protein namesi
Recommended name:
Insulin receptor substrate 2
Short name:
IRS-2
Gene namesi
Name:IRS2
OrganismiHomo sapiens (Human)
Taxonomic identifieri9606 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
Proteomesi
  • UP000005640 Componenti: Chromosome 13

Organism-specific databases

HGNCiHGNC:6126. IRS2.

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cytoplasm

Pathology & Biotechi

Organism-specific databases

DisGeNETi8660.
MalaCardsiIRS2.
OpenTargetsiENSG00000185950.
PharmGKBiPA375.

Polymorphism and mutation databases

BioMutaiIRS2.
DMDMi62298062.

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00000842391 – 1338Insulin receptor substrate 2Add BLAST1338

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Modified residuei306PhosphoserineCombined sources1
Modified residuei346PhosphoserineCombined sources1
Modified residuei350PhosphothreonineCombined sources1
Modified residuei365PhosphoserineCombined sources1
Modified residuei384PhosphoserineCombined sources1
Modified residuei388PhosphoserineCombined sources1
Modified residuei391PhosphoserineCombined sources1
Modified residuei412Omega-N-methylarginineCombined sources1
Modified residuei520PhosphothreonineCombined sources1
Modified residuei523PhosphoserineCombined sources1
Modified residuei527PhosphothreonineCombined sources1
Modified residuei540Phosphotyrosine; by INSRBy similarity1
Modified residuei560PhosphoserineCombined sources1
Modified residuei577PhosphoserineCombined sources1
Modified residuei579PhosphothreonineCombined sources1
Modified residuei580PhosphothreonineCombined sources1
Modified residuei594PhosphoserineCombined sources1
Modified residuei608PhosphoserineCombined sources1
Modified residuei620PhosphoserineCombined sources1
Modified residuei653Phosphotyrosine; by INSRBy similarity1
Modified residuei675Phosphotyrosine; by INSRCombined sources1
Modified residuei679PhosphoserineCombined sources1
Modified residuei682PhosphoserineCombined sources1
Modified residuei735PhosphoserineCombined sources1
Modified residuei736PhosphoserineCombined sources1
Modified residuei770PhosphoserineCombined sources1
Modified residuei779PhosphothreonineCombined sources1
Modified residuei805PhosphoserineCombined sources1
Modified residuei828PhosphoserineCombined sources1
Modified residuei915PhosphoserineCombined sources1
Modified residuei919Phosphotyrosine; by INSRBy similarity1
Modified residuei973PhosphoserineCombined sources1
Modified residuei978Phosphotyrosine; by INSRBy similarity1
Modified residuei1082PhosphothreonineCombined sources1
Modified residuei1100PhosphoserineCombined sources1
Modified residuei1159PhosphothreonineCombined sources1
Modified residuei1162PhosphoserineCombined sources1
Modified residuei1174PhosphoserineCombined sources1
Modified residuei1176PhosphoserineCombined sources1
Modified residuei1186PhosphoserineCombined sources1
Modified residuei1203PhosphoserineCombined sources1
Modified residuei1253Phosphotyrosine; by INSRBy similarity1

Keywords - PTMi

Methylation, Phosphoprotein

Proteomic databases

EPDiQ9Y4H2.
MaxQBiQ9Y4H2.
PaxDbiQ9Y4H2.
PeptideAtlasiQ9Y4H2.
PRIDEiQ9Y4H2.

PTM databases

iPTMnetiQ9Y4H2.
PhosphoSitePlusiQ9Y4H2.

Miscellaneous databases

PMAP-CutDBQ9Y4H2.

Expressioni

Gene expression databases

BgeeiENSG00000185950.
CleanExiHS_IRS2.
GenevisibleiQ9Y4H2. HS.

Organism-specific databases

HPAiCAB016944.
HPA054664.

Interactioni

Subunit structurei

Interacts with PHIP.By similarity

Binary interactionsi

WithEntry#Exp.IntActNotes
PIK3R1P279863EBI-1049582,EBI-79464
SIRT1Q96EB62EBI-1049582,EBI-1802965
YWHAZP631042EBI-1049582,EBI-347088

GO - Molecular functioni

Protein-protein interaction databases

BioGridi114209. 41 interactors.
IntActiQ9Y4H2. 14 interactors.
MINTiMINT-156306.
STRINGi9606.ENSP00000365016.

Structurei

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
3FQWX-ray1.93C1097-1105[»]
3FQXX-ray1.70C1097-1105[»]
ProteinModelPortaliQ9Y4H2.
SMRiQ9Y4H2.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ9Y4H2.

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Domaini16 – 144PHPROSITE-ProRule annotationAdd BLAST129
Domaini194 – 298IRS-type PTBPROSITE-ProRule annotationAdd BLAST105

Motif

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Motifi540 – 543YXXM motif 14
Motifi598 – 601YXXM motif 24
Motifi653 – 656YXXM motif 34
Motifi675 – 678YXXM motif 44
Motifi742 – 745YXXM motif 54
Motifi823 – 826YXXM motif 64
Motifi1072 – 1075YXXM motif 74

Compositional bias

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Compositional biasi19 – 28Poly-Asn10
Compositional biasi371 – 380Poly-Ala10
Compositional biasi447 – 452Poly-Ser6
Compositional biasi460 – 467Poly-Pro8
Compositional biasi533 – 537Poly-Gly5
Compositional biasi642 – 645Poly-Ser4
Compositional biasi694 – 701Poly-Ala8
Compositional biasi944 – 947Poly-Ser4
Compositional biasi1031 – 1038Poly-Pro8
Compositional biasi1265 – 1278Poly-ProAdd BLAST14

Sequence similaritiesi

Contains 1 IRS-type PTB domain.PROSITE-ProRule annotation
Contains 1 PH domain.PROSITE-ProRule annotation

Phylogenomic databases

eggNOGiENOG410IXEK. Eukaryota.
ENOG410Z9EP. LUCA.
GeneTreeiENSGT00530000063420.
HOVERGENiHBG000542.
InParanoidiQ9Y4H2.
KOiK07187.
OMAiWYRALTD.
OrthoDBiEOG091G02EF.
PhylomeDBiQ9Y4H2.
TreeFamiTF325994.

Family and domain databases

CDDicd01204. PTB_IRS. 1 hit.
Gene3Di2.30.29.30. 2 hits.
InterProiIPR002404. IRS_PTB.
IPR011993. PH_dom-like.
IPR001849. PH_domain.
[Graphical view]
PfamiPF02174. IRS. 1 hit.
PF00169. PH. 1 hit.
[Graphical view]
PRINTSiPR00628. INSULINRSI.
SMARTiSM00233. PH. 1 hit.
SM00310. PTBI. 1 hit.
[Graphical view]
SUPFAMiSSF50729. SSF50729. 2 hits.
PROSITEiPS51064. IRS_PTB. 1 hit.
PS50003. PH_DOMAIN. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Q9Y4H2-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MASPPRHGPP GPASGDGPNL NNNNNNNNHS VRKCGYLRKQ KHGHKRFFVL
60 70 80 90 100
RGPGAGGDEA TAGGGSAPQP PRLEYYESEK KWRSKAGAPK RVIALDCCLN
110 120 130 140 150
INKRADAKHK YLIALYTKDE YFAVAAENEQ EQEGWYRALT DLVSEGRAAA
160 170 180 190 200
GDAPPAAAPA ASCSASLPGA LGGSAGAAGA EDSYGLVAPA TAAYREVWQV
210 220 230 240 250
NLKPKGLGQS KNLTGVYRLC LSARTIGFVK LNCEQPSVTL QLMNIRRCGH
260 270 280 290 300
SDSFFFIEVG RSAVTGPGEL WMQADDSVVA QNIHETILEA MKALKELFEF
310 320 330 340 350
RPRSKSQSSG SSATHPISVP GARRHHHLVN LPPSQTGLVR RSRTDSLAAT
360 370 380 390 400
PPAAKCSSCR VRTASEGDGG AAAGAAAAGA RPVSVAGSPL SPGPVRAPLS
410 420 430 440 450
RSHTLSGGCG GRGSKVALLP AGGALQHSRS MSMPVAHSPP AATSPGSLSS
460 470 480 490 500
SSGHGSGSYP PPPGPHPPLP HPLHHGPGQR PSSGSASASG SPSDPGFMSL
510 520 530 540 550
DEYGSSPGDL RAFCSHRSNT PESIAETPPA RDGGGGGEFY GYMTMDRPLS
560 570 580 590 600
HCGRSYRRVS GDAAQDLDRG LRKRTYSLTT PARQRPVPQP SSASLDEYTL
610 620 630 640 650
MRATFSGSAG RLCPSCPASS PKVAYHPYPE DYGDIEIGSH RSSSSNLGAD
660 670 680 690 700
DGYMPMTPGA ALAGSGSGSC RSDDYMPMSP ASVSAPKQIL QPRAAAAAAA
710 720 730 740 750
AVPSAGPAGP APTSAAGRTF PASGGGYKAS SPAESSPEDS GYMRMWCGSK
760 770 780 790 800
LSMEHADGKL LPNGDYLNVS PSDAVTTGTP PDFFSAALHP GGEPLRGVPG
810 820 830 840 850
CCYSSLPRSY KAPYTCGGDS DQYVLMSSPV GRILEEERLE PQATPGPSQA
860 870 880 890 900
ASAFGAGPTQ PPHPVVPSPV RPSGGRPEGF LGQRGRAVRP TRLSLEGLPS
910 920 930 940 950
LPSMHEYPLP PEPKSPGEYI NIDFGEPGAR LSPPAPPLLA SAASSSSLLS
960 970 980 990 1000
ASSPASSLGS GTPGTSSDSR QRSPLSDYMN LDFSSPKSPK PGAPSGHPVG
1010 1020 1030 1040 1050
SLDGLLSPEA SSPYPPLPPR PSASPSSSLQ PPPPPPAPGE LYRLPPASAV
1060 1070 1080 1090 1100
ATAQGPGAAS SLSSDTGDNG DYTEMAFGVA ATPPQPIAAP PKPEAARVAS
1110 1120 1130 1140 1150
PTSGVKRLSL MEQVSGVEAF LQASQPPDPH RGAKVIRADP QGGRRRHSSE
1160 1170 1180 1190 1200
TFSSTTTVTP VSPSFAHNPK RHNSASVENV SLRKSSEGGV GVGPGGGDEP
1210 1220 1230 1240 1250
PTSPRQLQPA PPLAPQGRPW TPGQPGGLVG CPGSGGSPMR RETSAGFQNG
1260 1270 1280 1290 1300
LNYIAIDVRE EPGLPPQPQP PPPPLPQPGD KSSWGRTRSL GGLISAVGVG
1310 1320 1330
STGGGCGGPG PGALPPANTY ASIDFLSHHL KEATIVKE
Length:1,338
Mass (Da):137,334
Last modified:March 29, 2005 - v2
Checksum:i58E569E8BDBAF3D7
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti28N → NN in AAD21531 (PubMed:10077005).Curated1
Sequence conflicti39 – 41KQK → NEE in AAD21531 (PubMed:10077005).Curated3
Sequence conflicti59E → K in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti81K → N in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti107A → P in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti171L → V in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti371A → R in AAD21531 (PubMed:10077005).Curated1
Sequence conflicti379 – 382GARP → AQRL in AAD21531 (PubMed:10077005).Curated4
Sequence conflicti406S → I in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti410 – 419GGRGSKVALL → RAAGTKWHCF in BAA24500 (PubMed:9312143).Curated10
Sequence conflicti424A → G in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti436 – 438AHS → EHL in BAA24500 (PubMed:9312143).Curated3
Sequence conflicti453G → D in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti456S → W in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti468P → L in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti662L → F in AAD21531 (PubMed:10077005).Curated1
Sequence conflicti704S → F in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti714S → F in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti848S → T in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti872P → R in AAD21531 (PubMed:10077005).Curated1
Sequence conflicti875 – 878GRPE → RRS in AAD21531 (PubMed:10077005).Curated4
Sequence conflicti956S → L in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti1252N → K in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti1303G → R in BAA24500 (PubMed:9312143).Curated1
Sequence conflicti1314 – 1338LPPAN…TIVKE → PAPCPTTYAQH in BAA24500 (PubMed:9312143).CuratedAdd BLAST25

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Natural variantiVAR_033992789H → Y.Corresponds to variant rs35223808dbSNPEnsembl.1
Natural variantiVAR_021557879G → S.1 PublicationCorresponds to variant rs549588978dbSNPEnsembl.1
Natural variantiVAR_021558882G → A.1 PublicationCorresponds to variant rs201499247dbSNPEnsembl.1
Natural variantiVAR_033993999V → M.Corresponds to variant rs35927012dbSNPEnsembl.1
Natural variantiVAR_0148571057G → D.1 PublicationCorresponds to variant rs1805097dbSNPEnsembl.1

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB000732 Genomic DNA. Translation: BAA24500.1.
AF073310 mRNA. Translation: AAD21531.1.
AF322115, AF322114 Genomic DNA. Translation: AAG50013.1.
AL162497 Genomic DNA. Translation: CAH72369.1.
AF288517 Genomic DNA. Translation: AAK83053.1.
CCDSiCCDS9510.1.
RefSeqiNP_003740.2. NM_003749.2.
UniGeneiHs.442344.

Genome annotation databases

EnsembliENST00000375856; ENSP00000365016; ENSG00000185950.
GeneIDi8660.
KEGGihsa:8660.
UCSCiuc001vqv.4. human.

Keywords - Coding sequence diversityi

Polymorphism

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AB000732 Genomic DNA. Translation: BAA24500.1.
AF073310 mRNA. Translation: AAD21531.1.
AF322115, AF322114 Genomic DNA. Translation: AAG50013.1.
AL162497 Genomic DNA. Translation: CAH72369.1.
AF288517 Genomic DNA. Translation: AAK83053.1.
CCDSiCCDS9510.1.
RefSeqiNP_003740.2. NM_003749.2.
UniGeneiHs.442344.

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
3FQWX-ray1.93C1097-1105[»]
3FQXX-ray1.70C1097-1105[»]
ProteinModelPortaliQ9Y4H2.
SMRiQ9Y4H2.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi114209. 41 interactors.
IntActiQ9Y4H2. 14 interactors.
MINTiMINT-156306.
STRINGi9606.ENSP00000365016.

PTM databases

iPTMnetiQ9Y4H2.
PhosphoSitePlusiQ9Y4H2.

Polymorphism and mutation databases

BioMutaiIRS2.
DMDMi62298062.

Proteomic databases

EPDiQ9Y4H2.
MaxQBiQ9Y4H2.
PaxDbiQ9Y4H2.
PeptideAtlasiQ9Y4H2.
PRIDEiQ9Y4H2.

Protocols and materials databases

DNASUi8660.
Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsembliENST00000375856; ENSP00000365016; ENSG00000185950.
GeneIDi8660.
KEGGihsa:8660.
UCSCiuc001vqv.4. human.

Organism-specific databases

CTDi8660.
DisGeNETi8660.
GeneCardsiIRS2.
HGNCiHGNC:6126. IRS2.
HPAiCAB016944.
HPA054664.
MalaCardsiIRS2.
MIMi600797. gene.
neXtProtiNX_Q9Y4H2.
OpenTargetsiENSG00000185950.
PharmGKBiPA375.
GenAtlasiSearch...

Phylogenomic databases

eggNOGiENOG410IXEK. Eukaryota.
ENOG410Z9EP. LUCA.
GeneTreeiENSGT00530000063420.
HOVERGENiHBG000542.
InParanoidiQ9Y4H2.
KOiK07187.
OMAiWYRALTD.
OrthoDBiEOG091G02EF.
PhylomeDBiQ9Y4H2.
TreeFamiTF325994.

Enzyme and pathway databases

BioCyciZFISH:G66-31355-MONOMER.
ReactomeiR-HSA-109704. PI3K Cascade.
R-HSA-112412. SOS-mediated signalling.
R-HSA-1257604. PIP3 activates AKT signaling.
R-HSA-198203. PI3K/AKT activation.
R-HSA-2219530. Constitutive Signaling by Aberrant PI3K in Cancer.
R-HSA-2428928. IRS-related events triggered by IGF1R.
R-HSA-2586552. Signaling by Leptin.
R-HSA-5673001. RAF/MAP kinase cascade.
R-HSA-6811558. PI5P, PP2A and IER3 Regulate PI3K/AKT Signaling.
R-HSA-74713. IRS activation.
R-HSA-74749. Signal attenuation.
R-HSA-8853659. RET signaling.
R-HSA-982772. Growth hormone receptor signaling.
SignaLinkiQ9Y4H2.
SIGNORiQ9Y4H2.

Miscellaneous databases

ChiTaRSiIRS2. human.
EvolutionaryTraceiQ9Y4H2.
GeneWikiiIRS2.
GenomeRNAii8660.
PMAP-CutDBQ9Y4H2.
PROiQ9Y4H2.
SOURCEiSearch...

Gene expression databases

BgeeiENSG00000185950.
CleanExiHS_IRS2.
GenevisibleiQ9Y4H2. HS.

Family and domain databases

CDDicd01204. PTB_IRS. 1 hit.
Gene3Di2.30.29.30. 2 hits.
InterProiIPR002404. IRS_PTB.
IPR011993. PH_dom-like.
IPR001849. PH_domain.
[Graphical view]
PfamiPF02174. IRS. 1 hit.
PF00169. PH. 1 hit.
[Graphical view]
PRINTSiPR00628. INSULINRSI.
SMARTiSM00233. PH. 1 hit.
SM00310. PTBI. 1 hit.
[Graphical view]
SUPFAMiSSF50729. SSF50729. 2 hits.
PROSITEiPS51064. IRS_PTB. 1 hit.
PS50003. PH_DOMAIN. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiIRS2_HUMAN
AccessioniPrimary (citable) accession number: Q9Y4H2
Secondary accession number(s): Q96RR2, Q9BZG0, Q9Y6I5
Entry historyi
Integrated into UniProtKB/Swiss-Prot: May 30, 2000
Last sequence update: March 29, 2005
Last modified: November 30, 2016
This is version 150 of the entry and version 2 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Miscellaneousi

Keywords - Technical termi

3D-structure, Complete proteome, Reference proteome

Documents

  1. Human chromosome 13
    Human chromosome 13: entries, gene names and cross-references to MIM
  2. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  3. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  4. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  5. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  6. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.