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Assay Method Information |
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| | Inhibition Assay |
| Description: | Using a 96 well plate (#3915, Costar), a test compound (25 μL), 400 mM Tris-HCl buffer (pH 8.0, 25 μL) and 0.5 mg/mL fluorescence enzyme substrate (Gly-Asp-Asp-Asp-Asp-Lys-β-Naphtylamide, 25 μL) were mixed, and recombinant human enteropeptidase (R&D Systems, Inc., 25 μL) was added. Using a fluorescence plate reader fmax (Molecular Devices, Inc.), the reaction rate was measured from the time-course changes at excitation wavelength 320 nm and fluorescence wavelength 405 nm. The Ki value was calculated from the concentration of the test compound, reciprocal of reaction rate, and Km value of the enzyme substrate, and by using Dixon plot. |
| Affinity data for this assay | |
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