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| | Amplified Luminescence Proximity Homogeneous Assay |
| Description: | B-Raf (V600E; 4 pM) and biotinylated Mek (kinase dead; 10 nM) were combined at 2× final concentrations in assay buffer (50 mM Tris, pH 7.5, 15 mM MgCl2, 0.01% BSA and 1 mM DTT) and dispensed 10 μl per well in assay plates (Greiner white 384 well assay plates #781207) containing 0.5 μl of 40× of a compound of the invention diluted in 100% DMSO. The plate was incubated for 60 minutes at room temperature.The B-Raf kinase activity reaction was started by the addition of 10 μl per well of 2×ATP (10 μM) diluted in assay buffer. After 3 hours, the reactions were stopped with the addition of 10 μl of stop reagent (60 mM EDTA, 0.01% Tween20). Phosphorylated product was measured using a rabbit anti-p-MEK (Cell Signaling, #9121) antibody and the Alpha Screen IgG (ProteinA) detection Kit (PerkinElmer #6760617R), by the addition of 30 μl to the well of a mixture of the antibody (1:2000 dilution) and detection beads (1:1000 dilution of both beads) in bead buffer (50 mM Tris, pH 7.5, 0.01% Tween20). The additions were carried out under dark conditions to protect the detection beads from light. A lid was placed on top of the plate and the plate was incubated for 1 hour at room temperature. The luminescence was read on a PerkinElmer Envision instrument. The concentration of each compound for 50% inhibition (IC50) was calculated by non-linear regression using XL Fit data analysis software. |
| Affinity data for this assay | |
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