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Assay Method Information |
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| | Inhibition Assay |
| Description: | The inhibition of ALK tyrosine kinase activity can be demonstrated using known methods. For example, in one method, compounds can be tested for their ability to inhibit kinase activity of baculovirus-expressed ALK using a modification of the ELISA protocol reported for trkA. Phosphorylation of the substrate, phopholipase C-gamma (PLC-γ) generated as a fusion protein with glutathione-S-transferase (GST) can be detected with europium-labeled anti-phosphotyrosine antibody and measured by time-resolved fluorescence (TRF). In this assay, 96-well plate is coated with 100 μL/well of 10 μg/mL substrate (phospholipase C-γ in tris-buffered saline (TBS). The assay mixture (total volume=100 μL/well) consisting of 20 nM HEPES (pH 7.2, 1 μMATP (Km level), 5 nM MnCl2, 0.1% BSA, 2.5% DMSO, and various concentrations of test compound is then added to the assay plate. The reaction is initiated by adding the enzyme (30 ng/mL ALK) and is allowed to proceed at 37 degrees C. for 15 minutes. Detection of the phosphorylated product can be performed by adding 100 μL/well of Eu-N1 labeled PT66 antibody (Perkim Elmer # AD0041). Incubation at 37° C. for one hour, followed by addition of 100 μL enhancement solution (for example Wallac #1244-10). |
| Affinity data for this assay | |
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