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In order to evaluate the isoform selectivity of novel inhibitors within the c-Jun N-terminal kinase (JNK) family, a fluorescence polarization-based competition binding assay, previously developed for JNK3, was extended to the other isoforms JNK1 and JNK2. The assay is based on the displacement of a versatile fluorescent pyridinylimidazole-based probe and was validated by testing the precursor of the...
Two fluorescein-labeled pyridinylimidazoles were synthesized and evaluated as probes for the binding affinity determination of potential kinase inhibitors to the c-Jun N-terminal kinase 3 (JNK3) and p38α mitogen-activated protein kinase (MAPK). Fluorescence polarization (FP)-based competition binding assays were developed for both enzymes using 1-(3′,6′-dihydroxy-3-oxo-3H-spiro[isobenzofuran-1,9′-xanthen]-5-yl)-3-(4-((4-(4-(4-fluorophenyl)-2-(methylthio)-1H-imidazol-5-yl)pyridin-2-yl)amino)phenyl)thiourea...
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