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Assay Method Information

Assay Name:  RET Kinase Enzymatic Assay
Description:  Human RET kinase cytoplasmic domain (amino acids 658-1114 of accession number NP_000314.1) was expressed as an N-terminal GST-fusion protein using a baculovirus expression system. GST-RET was purified using glutathione sepharose chromatography. The RET kinase enzymatic assay was performed in a total volume of 10 uL with increasing concentrations of RET kinase inhibitor as a singlet in a 384 well format as follows: RET inhibitor compound plates are prepared by adding 100 nL of RET inhibitor at different concentrations to a 384-well plate. 5 μL/well of a 2x enzyme mix (50 mM HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid); 1 mM CHAPS (3-[(3-cholamidopropyl)dimethylammonio]-1-propane sulfonate); 0.1 mg/mL BSA (bovine serum albumin); 1 mM DTT (dithiothreitol); 0.2 nM RET kinase) was added to the 384-well plate and incubated for 30 minutes at 23 C. 5 μL/well of a 2 substrate mix (50 mM HEPES; 1 mM CHAPS; 0.1 mg/mL BSA; 20 μM adenosine triphosphate; 20 mM MgCl2 and 1 μM biotinylated peptide substrate) was added and incubated for 1 hour at 23 C. 10 μL/well of 2x stop/detection mix (50 mM HEPES; 0.1% BSA; 800 mM Potassium Fluoride; 50 mM EDTA (Ethylenediaminetetraacetic acid); 200 dilution of Europium Cryptate labeled anti-phosphotyrosine antibody; 62.5 nM Streptavidin-XL665) incubated for 1 hour at 23 C. and read on a Homogenous Time-Resolved Fluorescence reader. IC50s were fitted using GraphPad Prism to a sigmoidal dose response.
Affinity data for this assay
 

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Last update November 1, 2007
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