| Assay Method Information | |
| | In Vitro PI3K Alpha Binding Assay |
| Description: | N-terminally His-tagged PI3K alpha (Cat. No. PV4789; 0.49 mg/ml), Alexa Fluor 647 labeled kinase Tracer 314 (Cat. No. PV6087), Biotin anti-His Tag antibody (Cat. No PV6089) and LanthaScreen Eu-Streptavidin (Cat. No. PV5899) were purchased from Life Technologies. The 1× Kinase Buffer A consists of 50 mM HEPES pH 7.5, 10 mM MgCl2, 1 mM EGTA, and 0.01% (v/v) Brij-35 (Sigma Cat. No. B4184-100ML).A 4-fold serial dilution of each compound to be tested was prepared in DMSO (master dilution) in a 96-well polystyrene plate (Falcon Cat. No. 353072, flat bottom) with the highest concentration at 1000 μM and the lowest at 0.004 μM. The master dilution series were diluted further 33.3-fold into Kinase Buffer A by transferring 5 μl of each concentration of diluted compound to 162 μl Kinase Buffer A in a new 96-well plate resulting to a 3-fold serially compound dilution. Based on a Tracer 314 titration experiment a working concentration of 20 nM was chosen. Therefore a 60 nM Tracer 314 solution in Kinase Buffer A was prepared resulting in a 3-fold concentrated solution. A 3-fold concentrated kinase/antibody solution at 15 nM kinase, 6 nM antibody and 6 nM Eu-Streptavidin was prepared in Kinase Buffer A. Five μl of each 3× serially diluted compound were dispensed in a 384-well plate in duplicate. Then to each well 5 μl of 3× kinase/antibody mixture was added followed by the addition of 5 μl 3× Tracer 314 solution. After 1 h incubation at rt, time-resolved FRET was measured with a Synergy 4 multi-mode microplate reader (Biotek Instruments) using the following settings: 100 μs delay before data collection, 200 μs time for data collection, 10 measurements per data point. Emission filter: 665 nm/8 nm with sensitivity set to 163 and 620 nm/10 nm with sensitivity set to 135; Excitation filter: 340 nm/30 nm; Dichroic mirror 400 nm. |
| Affinity data for this assay | |
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