| Assay Method Information | |
| | ITK Enzyme Assay |
| Description: | 1.0 M HEPES Buffer pH 7.5 solution was prepared as follows: 238.3 g HEPES free acid (Sigma) and 800 mL of water were combined, and the mixture was stirred until complete dissolution. The pH was adjusted to 7.5 via titration with 5N NaOH and the volume adjusted to 1000 mL. The solution was filtered and sterilized.ITK assay buffer was prepared as follows: 50 mL of HPLC-grade water was treated with 2 mL of 1.0 M HEPES Buffer, 500 μL of 2% Gelatin (Sigma), 1.0 mL of aqueous MgCl2 solution (1.0 M), and 1.0 mL of aqueous glutathione solution (0.5 M), and the solution was mixed. The solution was brought to 99 mL in a graduated cylinder by addition of water and sterilized through a 0.2 μm filter. 0.1 mL of Brij-35 Surfact-Amps Detergent Solution (10% w/v aqueous solution, ThermoFisher) and 1.0 mL of ATP (Teknova,100 mM) were added and the solution was mixed.Preparation of 1.33 ITK enzyme solution was as follows: 49.99 mL of ITK assay buffer was treated with 4.1 μL of ITK enzyme (ITK FL (N-Flag and C-His tagged, −72 kDa) Lake Pharma, 0.25 mg/ml in a buffer containing 25 mM Tris pH 7.8, 150 mM NaCl, 10% glycerol and 2 mM TCEP) and the mixture was gently agitated. The resulting solution was stored on ice. 30 Minutes prior to use, the enzyme solution was removed from ice and equilibrated to RT by incubation in a RT water bath. |
| Affinity data for this assay | |
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