| Assay Method Information | |
| | Enzymatic Assay |
| Description: | Methods: A peptide mobility shift assay was used to quantify the phosphorylation of the JAKtide (JAK-2 and JAK-3) or the IRS-1 peptide (JAK-1 and Tyk-2). Reactions were carried out in a 384-well plate (Matrical MP-101) in a 10 microliter total volume. Reaction mixtures contained 20 mM HEPES, pH 7.4, 10 mM magnesium chloride, 0.01% bovine serum albumin (BSA), 0.0005% Tween-20, ATP (4 micromolar for JAK-2 and JAK-3, 40 micromolar for JAK-1 and 7 micromolar for Tyk-2)), 2% DMSO and 1 micromolar peptide substrate (JAKtide for JAK-2 and JAK-3 or IRS-1 peptide for JAK-1 and Tyk-2). Compounds were diluted serially in 100% dimethyl sulfoxide and tested in an 11 point dose response in duplicate or quadruplicate (200 nl of compound/DMSO was added per 10 microliter reaction). The reactions were initiated by the addition of enzyme to the final concentration of 2 nM JAK-2, 1 nM JAK-3, 7 nM Tyk2 or 20 nM JAK-1. The assay was run for 240 minutes for JAK-1, 150 minutes for JAK-2, 90 minutes for JAK-3. |
| Affinity data for this assay | |
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