Inhibition of Tel-fused FGFR4 (unknown origin) expressed in mouse BA/F3 cells after 48 hrs by luciferase reporter gene assay in absence of recombinant mouse IL3
ADP-Glo Kinase Assay: In this assay, the inhibitory activity of a test substance against the tyrosine kinase activity of FGFR4 protein is measured.To each well of a flat bottom 96 well white plate (Sumitomo Bakelite Co., Ltd., MS-8496W), 10 ul FGFR4 protein (Carna Biosciences, Inc., 08-136) solution diluted to 1 ug/mL with an assay buffer (20 mM HEPES-NaOH, 0.01% Triton X-100, 2 mM DTT, 5 mM MgCl2 and 2 mM MnCl2), 10 uL of an assay buffer solution containing CSK-tide substrate (Ana Spec Inc., 63843) in a final concentration of 1000 nM and ATP (Promega Corporation, V9102) in a final concentration of 75 uM, and 5 ul of a test substance diluted with the assay buffer were added and the reaction was performed at room temperature for 2 hours (kinase reaction). For measuring kinase activity, ADP-Glo Kinase Assay (Promega Corporation, V9102) was used.
Inhibition Assay: Purified recombinant human FGFR4 protein was purchased from Carna Biosciences, Inc. When setting conditions for the measurement of the inhibitory effect of the compounds on FGFR4 kinase activity, a biotinylated peptide (biotin-EEPLYWSFPAKKK) was synthesized for use as a substrate by utilizing the amino acid sequence of FL-Peptide 22 (Caliper Life Sciences, Inc.) with biotin. The purified recombinant human FGFR4 protein used in the test was purchased from Carna Biosciences, Inc. In the measurement of the inhibitory effect of the compounds, first, a test compound was gradually diluted with dimethylsulfoxide (DMSO) to a concentration 20 times higher than the final concentration. Next, the purified human FGFR4 protein, substrate peptide (final concentration: 250 nM), magnesium chloride (final concentration: 5 mM), ATP (final concentration: 190 .mu.M), and the test compound DMSO solution (final concentration of DMSO: 5%) were added to a reaction buffer.
Inhibition of N-terminal His6-tagged recombinant human FGFR4 expressed in baculovirus infected insect Sf9 cells assessed as remaining activity at 1 uM relative to control
Inhibition of recombinant human His-tagged cytoplasmic FGFR4 (781 to 1338 residues) expressed in baculovirus expression system at 1 uM relative to control
Inhibition of recombinant human N-terminal His6-tagged FGFR4 (442 to 755 residues) expressed in baculovirus infected Sf21 cells at 1 uM by radiometric assay relative to control