| Assay Method Information | |
| | Kinetic Biochemical Assay |
| Description: | Compounds that inhibit the hGYS1 enzyme and, subsequently, the downstream conversion of NADH to NAD+, were tested using assay ready plates (black, clear bottom 384 well plates) in a final DMSO reaction volume of 2.5% DMSO. The Assay Buffer contained 50 mM Tris pH 7.5, 2 mM MgCl2, and 100 mM KCl. Fresh stocks of BSA at a final concentration of 0.02% and TCEP at 1 mM were added before splitting buffer into hGYS1 buffer and substrate buffer. To the hGYS1 buffer, rabbit liver glycogen was added at a final concentration of 0.2% glycogen. Glucose-6-Phosphate was added at 1 mM, recombinant hGYS1/GN1 protein was added at 50 nM to the substrate buffer, phosphoenolpyruvate (PEP) was added at 2 mM, UDP-Glucose was added at 0.8 mM, NADH) was added at 0.6 mM, and Pyruvate Kinase/Lactate Dehydrogenase was added at 20 units/mL. The reaction was initiated by mixing hGYS1 buffer and substrate buffer at a 1:1 ratio. Both buffers were plated using a liquid dispensing device with hGYS1 buffer plated first followed by the substrate buffer. Plates were spun briefly to eliminate air bubbles and are immediately read in continuous mode at an absorbance of 340 nm, for 10 time points in one-minute increments, for a total of 10 minutes. The slope from these 10 time points was normalized to the positive and negative control wells. The duplicate % inhibition values are then averaged and fit to a Hill equation for dose response according to the Levenberg-Marquardt algorithm with the Hill equation maximum set to 100 and the minimum set to 0. |
| Affinity data for this assay | |
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