| Assay Method Information | |
| | AlphaScreen Assay |
| Description: | The PI3K AlphaScreen assay (PerkinElmer, Waltham, Mass.) measures the activity of a panel of four phosphoinositide 3-kinases: PI3Kα, PI3Kβ, PI3Kγ, and PI3Kδ. Each of these enzymes phosphorylates the 3′-hydroxyl group on phosphatidylinositiol (4,5)-bisphosphate (PIP2) to produce phosphatidylinositol (3,4,5)-trisphosphate (PIP3). This phosphorylation activity is measured using a GST-tagged PIP3 binding protein (Echelon Biosciences, Salt Lake City, Utah), an anti-GST-tagged Acceptor bead, and streptavidin-Donor bead. The interaction of biotinylated-PIP3 analog (IP4) and the PIP3 binding protein brings both Acceptor and Donor beads together producing, upon excitation of the Donor beads at 680 nm, a singlet oxygen species leading to the luminescent AlphaScreen signal. When PIP3 is produced via phosphorylation of PIP2 by a PI3K, PIP3 competes with biotinylated-PIP3 analog (IP4) for binding to the PIP3 binding protein. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |