| Assay Method Information | |
| | Biochemical Assay |
| Description: | 384-well (Greiner #784075) (or 1536-well [Greiner #782075]) plates containing 60 nl (or 20 nl for 1536-well) of compound in 100% DMSO (10 concentrations serially diluted 3.16-fold) were prepared. Two copies of plates were used one for the GCN2 assay and a second for an artifact plate. Working reagents were prepared as follows reaction buffer: Tris pH 7.5 20 mM, MgCl2 5 mM, DTT 1 mM, Brij-35 0.005%, EGTA 0.5 mM in water; 2 enzyme solution: GCN2 (produced in-house) 1.6 nM in reaction buffer; 2 substrate solution: GFP-eIFS1 (Thermo Fisher Scientific, PV4809) 50 nM, ATP 0.2 mM, tRNA 0.4 mg/ml in reaction buffer; p-GFP-eIF2S1 (artifact) solution: p-GFP-eIFS1 (produced by incubation of 100 nM GFP-eIF2S1 in reaction buffer with 100 uM ATP and 1 nM PERK KD enzyme for 3 hr at room temperature) 2 nM in reaction buffer; 3 stop/antibody solution: p-GFP-EIF2S1 Th-Ab (Thermo Fisher Scientific, PV4816) 6 nM, AZ13933939 3 uM, BSA 3% in reaction buffer. Reagents were loaded onto a liquid dispenser (Certus FLEX, Trajan Scientific and Medical), and 3 ul (1 ul for 1536-well) of 2 enzyme solution, followed by 3 ul (1 ul for 1536-well) of 2 substrate solution was added to the plates. When small numbers of plates were processed, the enzyme solution was added first to all plates, then the valve used for the substrate solution was primed immediately prior to use. Plates were tapped or spun 1 min/1K/RT to ensure proper mixing, followed by incubation at room temperature for 70 mins, covered/stacked in the dark. |
| Affinity data for this assay | |
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