| Assay Method Information | |
| | FGFR1 Enzyme Activity Assay |
| Description: | FGFR1 kinase activity was measured by the Invitrogen LanthaScreen™ Assay technology which directly measures the amount of substrate phosphorylation by Time-resolved fluorescence energy transfer (TR-FRET) using a fluorescently-labeled peptide and Europium-labeled antibody. Briefly, 200 μM His-tagged recombinant human FGFR1 catalytic domain (amino acids 308-731) (Life Technologies Cat. No. PR4660A) was incubated with 100 nM Alexa Fluor® 647-Poly-GT Peptide Substrate (Life Technologies Cat. No. PV5836) and 151.1M ATP along with test compound in a buffer consisting of 250 mM HEPES, 25 mM MgCl2, 0.05% TritonX-100, pH 7.5, and 2% DMSO. Compounds were typically prepared in a threefold serial dilution in DMSO and added to the assay to give the appropriate final concentration. After a 20 minutes incubation at 22° C., an equal volume of 2 nM LanthaScreen® Eu-PY20 Antibody (Life Technologies Cat. No. PV5691) and 10 mM EDTA was added to quench the kinase reaction and start the detection reaction. After an additional 60 minute incubation at 22° C., the reaction was measured using a PerkinElmer EnVision multimode plate reader via TR-FRET dual wavelength detection, and the percent of control (POC) calculated using a ratiometric emission factor. 100 POC was determined using no test compounds and 0 POC was determined using no enzyme. The POC values were fit to a 4-parameter logistic curve as a function of the concentration of the compound, and the IC50 value is the point where the curve crosses 50 POC. |
| Affinity data for this assay | |
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