PIK3R1 | Phosphatidylinositol 3-kinase regulatory subunit alpha
 
image/svg+xmlExtracellular space Cytosol Plasma membrane Cytoskeleton Lysosome Endosome Peroxisome ER Golgi Apparatus Nucleus Mitochondrion None Substrate Localization legend

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Sequence Viewer
Gene
Synonyms
GRB1
Protein Name
Phosphatidylinositol 3-kinase regulatory subunit alpha
UniProt ID
P27986 [go to UniProt ] [go to PDBe-KB ]
Ensembl Gene ID
NCBI Gene ID
Molecular Weight
83598
Protein Length
724
Protein Domain
3D Structure
(PDB ID : 5m6u)
Target by Small Molecules
Protein-protein Interaction Database
Gene Expression
Drugs and Diseases
Enzyme Class
-
Catalytic Site
Catalytic Activity
-
Localization
Function
Binds to activated (phosphorylated) protein-Tyr kinases, through its SH2 domain, and acts as an adapter, mediating the association of the p110 catalytic unit to the plasma membrane. Necessary for the insulin-stimulated increase in glucose uptake and glycogen synthesis in insulin-sensitive tissues. Plays an important role in signaling in response to FGFR1, FGFR2, FGFR3, FGFR4, KITLG/SCF, KIT, PDGFRA and PDGFRB. Likewise, plays a role in ITGB2 signaling (PubMed:17626883, PubMed:19805105, PubMed:7518429). Modulates the cellular response to ER stress by promoting nuclear translocation of XBP1 isoform 2 in a ER stress- and/or insulin-dependent manner during metabolic overloading in the liver and hence plays a role in glucose tolerance improvement (PubMed:20348923).
Gene Ontology
GO:0005911; GO:0005801; GO:0005737; GO:0005829; GO:0016020; GO:0005634; GO:1990578; GO:0005942; GO:0005943; GO:0005886; GO:0016303; GO:0046935; GO:0043125; GO:0043559; GO:0005158; GO:0043560; GO:0005159; GO:0005168; GO:0043548; GO:0035014; GO:0036312; GO:0046934; GO:0001784; GO:0046982; GO:0019903; GO:0008134; GO:0005068; GO:0007411; GO:0030183; GO:0001678; GO:0032869; GO:0034644; GO:0019221; GO:0007173; GO:0038128; GO:0008625; GO:0038095; GO:0038096; GO:0007186; GO:0060396; GO:0008286; GO:0048009; GO:0008630; GO:0050900; GO:0043066; GO:0001953; GO:0045671; GO:0014065; GO:0046854; GO:0048015; GO:0030168; GO:0030335; GO:1900103; GO:0046326; GO:0014068; GO:0042307; GO:0051897; GO:1903078; GO:0033120; GO:0045944; GO:0032760; GO:0006606; GO:0006468; GO:0050821; GO:0046626; GO:0043551; GO:0051492; GO:0034976; GO:0031295; GO:0050852; GO:0048010; GO:0016032
 
Gene Ontology