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| | Bruton's Tyrosine Kinase (BTK) Inhibition Assay |
| Description: | The assay is a capture of radioactive 33P phosphorylated product through filtration. The interactions of BTK, biotinylated SH2 peptide substrate (Src homology), and ATP lead to phosphorylation of the peptide substrate. Biotinylated product is bound streptavidin sepharose beads. All bound, radiolabeled products are detected by scintillation counter.Plates assayed are 96-well polypropylene (Greiner) and 96-well 1.2 μm hydrophilic PVDF filter plates (Millipore). Concentrations reported here are final assay concentrations: 10-100 μM compounds in DMSO (Burdick and Jackson), 5-10 nM BTK enzyme (His-tagged, full-length), 30 μM peptide substrate (Biotin-Aca-AAAEEIYGEI-NH2), 100 μM ATP (Sigma), 8 mM imidazole (Sigma, pH 7.2), 8 mM glycerol-2-phosphate (Sigma), 200 μM EGTA (Roche Diagnostics), 1 mM MnCl2 (Sigma), 20 mM MgCl2 (Sigma), 0.1 mg/ml BSA (Sigma), 2 mM DTT (Sigma), 1 μCi 33P ATP (Amersham), 20% streptavidin sepharose beads (Amersham), 50 mM EDTA (Gibco), 2 M NaCl (Gibco), 2 M NaCl w/1% phosphoric acid (Gibco), microscint-20 (Perkin Elmer). |
| Affinity data for this assay | |
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