| Assay Method Information | |
| | Biochemical Assay for uKIT |
| Description: | Activity of c-KIT kinase (SEQ. ID NO. 1 or SEQ. ID NO. 2) was determined spectroscopically using a coupled pyruvate kinase/lactate dehydrogenase assay that continuously monitors the ATP hydrolysis-dependent oxidation of NADH (e.g., Schindler et al. Science (2000) 289: 1938-1942). Assays were conducted in 384-well plates (100 μL final volume) using 16 nM (Decode, SEQ ID No. 1) or 4.36 nM (Signal Chem, SEQ. ID No. 2), 0.7 mg/mL PE4Y substrate, 1.5 units pyruvate kinase, 2.1 units lactate dehydrogenase, 1 mM phosphoenol pyruvate, 0.28 mM NADH and 1 mM ATP in assay buffer (100 mM Tris, pH 7.5, 15 mM MgCl2, 0.5 mM DTT, 0.1% octyl-glucoside, 0.002% (w/v) BSA, and 0.002% Triton X-100). Inhibition of KIT was measured by adding serial diluted test compound (final assay concentration of 1% DMSO). A decrease in absorption at 340 nm was monitored continuously for 6 h at 30° C. on a multi-mode microplate reader (BioTek). The reaction rate was calculated using the 2-3 h time frame. The reaction rate at each concentration of compound was converted to percent inhibition using controls (i.e., reaction with no test compound and reaction with a known inhibitor) and IC50 values were calculated using software routines in Prism (GraphPad software). |
| Affinity data for this assay | |
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