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Assay Method Information |
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| | Enzymatic Assay |
| Description: | IRAK4 is a human purified recombinant enzyme (His-TEV-IRAK4 (1-460)). In this assay, IRAK4 hydrolyses ATP, autophosphorylates and phosphorylates a Serine/Threonine generic peptidic substrate (STK: 61ST1BLC from CisBio International). Measurement of IRAK-4 inhibition is performed in 384-well format based on a luminescence assay (ADP-Glo Kinase Assay from Promega). Purified human recombinant IRAK4 (0.3 ug/ml) and serial diluted compounds in DMSO (range of concentration from 10 uM to 0.5 nM) or controls (1% DMSO) are incubated for 15 minutes at RT in assay buffer containing 50 mM Hepes pH 7.0, Fatty acid-free BSA 0.1%, Dithiothreitol (DTT) 2 mM, MgCl2 10 mM, EGTA 0.5 mM, Triton X-100 0.01%, MnCl2 5 mM. The kinase reaction is then initiated by the addition of ATP (2 uM) and the peptidic substrate STK1-biotin peptide (300 nM). After 2 hours of incubation at RT, the reaction is stopped and the unconsumed ATP depleted by the addition of ADP-Glo Reagent according to supplier instructions. After 40 minutes of incubation at RT, the Kinase Detection Reagent is then added to the assay plate according to supplier instructions. After 20 minutes of incubation at RT, the luminescence signal is measured with a plate-reading luminometer (PerkinElmer Envision or equivalent reader). |
| Affinity data for this assay | |
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