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Assay Method Information |
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| | Kinase Assay |
| Description: | The FLT3 inhibitory activity of the CDK4/6-FLT3 inhibitors was determined with a HTRF kinase assay. The FLT3 enzyme (GST-FLT3 fusion) was purchased from Carna Biosciences. An ULight-labeled synthetic peptide derived from human Janus kinase 1 (aa1015-1027, ULight-JAK1, PerkinElmer) was utilized as the phosphoacceptor substrate. The assay was conducted in a 384-well white OptiPlate (PerkinElmer). The 20 μL reaction mixture contained 50 nM ULight-JAK1, 116 μM ATP, 0.0385 ng/μL FLT3 and dilutions of test compounds in the kinase buffer (50 mM Hepes, pH 7.6, 1 mM EGTA, 10 mM MgCl2, 2 mM DTT, and 0.005% Tween 20). The reaction was allowed to proceed for 1 hour at room temperature and was stopped by adding 20 μL of 10 mM EDTA, 2 nM LANCE Eu-W1024 anti-phospho-tyrosine antibody in LANCE detection buffer (PerkinElmer). The plates were incubated at room temperature for 2 hours after addition of detection reagents and then read on an Envision multimode reader (PerkinElmer). |
| Affinity data for this assay | |
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