| Assay Method Information | |
| | Fluorometric Assay |
| Description: | The utility of the compounds in accordance with the present invention as inhibitors of dipeptidyl peptidase-IV enzyme activity may be demonstrated by methodology known in the art. Inhibition constants are determined as follows. A continuous fluorometric assay is employed with the substrate Gly-Pro-AMC, which is cleaved by DPP-4 to release the fluorescent AMC leaving group. The kinetic parameters that describe this reaction are as follows: Km=50 uM; kcat=75 s-1; kcat/Km=1.5x106 M-1s-1. A typical reaction contains approximately 50 pM enzyme, 50 uM Gly-Pro-AMC, and buffer (100 mM HEPES, pH 7.5, 0.1 mg/ml BSA) in a total reaction volume of 100 uL. Liberation of AMC is monitored continuously in a 96-well plate fluorometer using an excitation wavelength of 360 nm and an emission wavelength of 460 nm. Under these conditions, approximately 0.8 uM AMC is produced in 30 minutes at 25 degrees C. |
| Affinity data for this assay | |
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