|Application ||WB, IHC, IF|
|Calculated MW||83598 Da|
|Other Names||Phosphatidylinositol 3-kinase regulatory subunit alpha, PI3-kinase regulatory subunit alpha, PI3K regulatory subunit alpha, PtdIns-3-kinase regulatory subunit alpha, Phosphatidylinositol 3-kinase 85 kDa regulatory subunit alpha, PI3-kinase subunit p85-alpha, PtdIns-3-kinase regulatory subunit p85-alpha, PIK3R1, GRB1|
|Target/Specificity||A synthetic peptide corresponding to residues in the C-term of human PI3-K 85 alpha was used as an immunogen.|
|Format||50 mM Tris-Glycine (pH 7.4), 0.15 M NaCl, 40% Glycerol, 0.01% sodium azide and 0.05% BSA.|
|Storage||Maintain refrigerated at 2-8°C for up to 6 months. For long term storage store at -20°C in small aliquots to prevent freeze-thaw cycles.|
|Precautions||PI3-kinase (p85) Antibody (subunit alpha) (C-term) is for research use only and not for use in diagnostic or therapeutic procedures.|
|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).|
|Tissue Location||Isoform 2 is expressed in skeletal muscle and brain, and at lower levels in kidney and cardiac muscle. Isoform 2 and isoform 4 are present in skeletal muscle (at protein level)|
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Provided below are standard protocols that you may find useful for product applications.
PI3-Kinases (PI3-Ks) are a family of lipid kinases that are implicated in signal transduction. PI3-K consists of two subunits; the regulatory subunit p85 and the catalytic subunit p110 (1-2). In quiescent cells p85 maintains p110 in a low activity state. Upon growth factor stimulation, p85 directly interacts with phosphotyrosine residues of activated growth factor receptors or adaptor proteins leading to activation of p110. p85 exists in two isoforms: p85 , including two short forms termed p50 and p55/AS53 and p85 including short form p55 PIK/p55 (3). The p85 adaptor protein uses the inter-SH2 (iSH2) region to bind p110 and employs SH3 and SH2 domains, phosphotyrosine residues, and proline-rich motifs to interact with activated tyrosine kinases such as BCR/ABL and NPM/ALK or adaptor proteins including Shc, c-Cbl, Crk-L, and Gab2 (4-5).
1. Otsu et al. (1992) Cell 65, 91-104
2. Hiles et al. (1991) Cell 70, 419-429
3. Inukai et al. (1997) J. Biol. Chem. 272, 7873-7882
4. Klippel, A., J. A. Escobedo, Q. Hu, and L. T. Williams. Mol. Cell. Biol. 13:5560-5566.
5. Jain, S. K., W. Y. Langdon, and L. Varticovski. 1997.Oncogene 14:2217-2228
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