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| | Inhibitory Effect on HER2-Phosphorylating Activity (In Vitro) |
| Description: | For setting the conditions for the method for measuring the in vitro inhibitory activity of a compound against HER2-phosphorylating activity, ProfilerPro Peptide 22 from PerkinElmer Inc. was used as a substrate on the basis of the report (PLoS One, 6 (7), e21487, 2011) on HER2 kinase reaction using, as a substrate, a peptide having the same sequence (5-FAM-EEPLYWSFPAKKK-CONH2) as that of ProfilerPro Peptide 22. The purified recombinant human HER2 protein used in the test was purchased from Carna Biosciences, Inc.For the inhibitory activity measurement of each compound, the synthesis example compound was first serially diluted with dimethyl sulfoxide (DMSO). Next, the HER2 protein, the substrate peptide (final concentration: 0.5 μM), manganese chloride (final concentration: 10 mM), ATP (final concentration: 6 μM), and the solution of the synthesis example compound in DMSO (final concentration of DMSO: 5%) were added into a buffer solution for kinase reaction (15 mM Tris (pH 7.5), 2 mM dithiothreitol, and 0.01% Tween 20), and the mixture was incubated at 25° C. for 40 minutes for kinase reaction. The reaction was terminated by adding EDTA (final concentration: 30 mM) thereto. Finally, the unphosphorylated substrate peptide (S) and the phosphorylated peptide (P) were separated and detected by microcapillary electrophoresis using LabChip EZ Reader II (PerkinElmer Inc.). |
| Affinity data for this assay | |
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