Kinase Assay: The kinase assays were conducted in a 20 μl volume using 384-well plates (Greiner). The reaction mixture consists of compound or vehicle (1% DMSO), 0.08 ng/μl TNIK_N, 1 μM FITC-labeled substrate peptides, including ε-aminocaproic acid and 7 amino acids (described as SEQ ID NO. 3 in "Kinase assay of TEST EXAMPLE 1" of WO 2010/064111(P.31)), 20 mM Hepes, pH 7.5, 0.01% Triton X-100, 5 mM MgCl2, 25 μM ATP and 2 mM DTT. As blank, TNIK_N was excluded from the reaction mixture of vehicle (1% DMSO). The kinase reaction was carried out 1 h at room temperature and terminated by addition of 60 μl of the termination buffer (127 mM Hepes, pH 7.5, 26.7 mM EDTA, 0.01% Triton X-100, 1% DMSO and 0.13% Coating Reagent 3 (Caliper Life Sciences)). The amount of unphosphorylated and phosphorylated FITC-labeled substrate peptides was detected by Mobility Shift Micro Fluidic Technology (Caliper LC3000 System, Caliper Life Sciences).
Inhibition of TNIK in human NCI-H1703 cells transfected with lentiviral vector 7TFP assessed as reduction of GSK3 inhibitor X activated TNIK-mediated Wnt/TCF/beta-catenin-dependent transcription at 10 uM after 24 hrs by luciferase reporter assay