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| | Biochemical Assay |
| Description: | Compounds of the present invention were evaluated for potency against PI3-Kalpha using an in vitro kinase assay. PI3-Kalpha activity is measured in vitro by determining the level of phosphorylation of the substrate PI(4,5)P2. The formation of product PI(3,4,5)P3 is monitored by binding to the Grip1 PH domain in a ligand displacement fluorescence polarization (FP) assay, in which the TAMRA-labeled PI(3,4,5)P3 complexed with Grip1 PH domain is displaced by PI(3,4,5)P3 formed in the PI3-Kalpha reaction resulting in a decrease in FP signal. Mouse PI3-Kalpha P110 and P85 subunits were co-expressed in insect cells and co-purified to homogeneity. PI(4,5)P2 were obtained from Cayman. TAMRA-labeled PI(3,4,5)P3 were from Echelon, Grip1 PH domain from Dundee and other reagents were from Sigma. All assays were performed in a Corning solid black 96-well half area plate using LJL Analyst (Molecular Devices) at room temperature. The assay buffer contained 50 mM HEPES, pH 7.4, 150 mM NaCl. |
| Affinity data for this assay | |
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