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Assay Method Information

Assay Name:  Kinase Assay
Description:  The compounds of the invention were tested for inhibitory activity of JAK targets according to the following in vitro assay described in Park et al., Analytical Biochemistry 1999, 269, 94-104. The catalytic domains of human JAK1 (a.a. 837-1142), JAK2 (a.a. 828-1132) and JAK3 (a.a. 781-1124) with an N-terminal His tag were expressed using baculovirus in insect cells and purified. The catalytic activity of JAK1, JAK2 or JAK3 was assayed by measuring the phosphorylation of a biotinylated peptide. The phosphorylated peptide was detected by homogenous time resolved fluorescence (HTRF). IC50 was measured for each kinase in the 40 uL reactions that contain the enzyme, ATP and 500 nM peptide in 50 mM Tris (pH 7.8) buffer with 100 mM NaCl, 5 mM DTT, and 0.1 mg/mL (0.01%) BSA. The ATP concentration in the reactions was 90 uM for Jak1, 30 uM for Jak2 and 3 uM for Jak3. Reactions were carried out at room temperature for 1 hr and then stopped with 20 uL 45 mM EDTA.
Affinity data for this assay
 

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Last update November 1, 2007
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