| Assay Method Information | |
| | Inhibition Assay |
| Description: | Specific high-throughput screening assays were developed for KHK-C and KHK-A using recombinant proteins. Purified human recombinant KHK-C and KHK-A were produced using the Bio-Rad Profinity eXact Fusion-Tag System and Profinia protein purification instrument. The assays consist of a 3-step, coupled-enzyme process involving fructokinase (KHK), pyruvate kinase (PK) and lactate dehydrogenase (LDH). 1,2 The disappearance of NADH is measured kinetically by A340 at 37 ° C. The enzymatic assay was carried out in a total reaction volume of 200 ul containing 50 mM PIPES, 6 mM MgCl2, 100 mM KCl, 100 uM-5 mM ATP, 2 mM phosphoenolpyruvate, 0.3 mM NADH, 15 U of pyruvate kinase, 15 U of lactate dehydrogenase, and 75-1000 ng KHKC. 1 mM fructose was added to the reactions, except for the no fructose controls which utilized water. The high-throughput assay was used to identify inhibitors that have an IC50 value <5 M for KHK-C.5 The '559 pub also sets forth a KHK assay for testing inhibition activity of potential KHK inhibitors. |
| Affinity data for this assay | |
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