Phospho-(Tyr) p85 PI3K Binding Motif Antibody #3821

Phosphoinositide 3 kinase (PI3K) is a lipid kinase that catalyzes the phosphorylation of PI(4,5)P2 at the D3 position of the inositol ring. The resulting product, PI(3,4,5)P3, can be recognized by PH domain-containing signaling molecules, including various kinases and their regulators, and activates the corresponding cell signaling pathways, eventually leading to cell growth, survival and cellular movement (1). PI3K is a heterodimer with a p85 regulatory subunit and p110 catalytic subunit. The p85 subunit has two SH2 domains that bind to phospho-tyrosine with the consensus motif (Y*XXM), where X denotes any amino acid and Y* is phosphorylated tyrosine. This motif exists in many of the receptor tyrosine kinases and their substrates, including EGFR, FGFR, IRS-1, BCAP and GAB1 (2,3). The docking of PI3K in the vicinity of the plasma membrane through p85 recognition of the receptor phosphorylated YXXM activates the PI3K pathway. Phospho-(Tyr) p85 PI3K Binding Motif Antibody specifically recognizes PI3K binding targets at their phosphorylated YXXM motif, providing a powerful new tool for PI3K binding protein discovery and characterization as well as HTS drug screening for potential regulators.