A Universal Tyrosine Kinase Assay Kit (Takara, Melbourne, Australia) was used to determine the enzymatic activity of rSmFGFRA at different concentrations (100 ng/μl - 0.78 ng/μl) in the presence or absence of 5 μM and 10 μM BIBF 1120 as described (14 (link), 36 (link)), following the manufacturer’s instructions. DMSO (0.1%) was served as negative control. The activity of rSmFGFRA was determined by comparing its absorbance with that of control protein tyrosine kinase (PTK), supplied with the kit, according to the manufacturer’s instructions. Technical duplicates were performed and the experiment was repeated twice.
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