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| | Enzymatic Assay |
| Description: | Activity of unphosphorylated c-FMS kinase (uFMS, Seq. ID no. 1) was determined by following the production of ADP from the FMS kinase reaction with ATP and poly E4Y as substrates through coupling with the pyruvate kinase/lactate dehydrogenase system (e.g., Schindler et al. Science (2000) 289: 1938-1942). In this assay, the oxidation of NADH (thus the decrease at A340 nm) was continuously monitored spectrophometrically. The reaction mixture (100 .mu.L) contained FMS (purchased from Millipore) (10 nM), polyE4Y (1 mg/mL), MgCl.sub.2 (10 mM), pyruvate kinase (4 units), lactate dehydrogenase (0.7 units), phosphoenol pyruvate (1 mM), NADH (0.28 mM) and ATP (500 .mu.M) in 90 mM Tris buffer containing 0.2% octyl-glucoside and 1% DMSO, pH 7.5. The inhibition reaction was started by mixing serial diluted test compound with the above reaction mixture. The absorption at 340 nm was monitored continuously for 4 hours at 30.degree. C. on Synergy 2 plate reader. |
| Affinity data for this assay | |
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