| Assay Method Information | |
| | PLK4 Biochemical Assay |
| Description: | Activity of human recombinant PLK4 (ThermoFisher, cat #PV6396) was measured by quantification of adenosine diphosphate (ADP) using the ADP-Glo Kinase Assay Kit (Promega, cat #V9102). Test compounds were solubilized in dimethyl sulfoxide (DMSO) and dispensed into 384-well white polystyrene nonbinding plates (Greiner, cat #781094) using the Echo acoustic dispenser (Labcyte Inc.) in a 11-point 3-fold titration in duplicates. 5 無 of 1.0 nM PLK4 protein in assay buffer (50 mM HEPES, pH 7.5, 0.01% Brij-35, 0.01% BSA, 10 mM MgCl2, 1 mM EGTA, 1 mM DTT) was added to the plates. Test compounds and PLK4 were incubated for 15 minutes at room temperature (RT). Then 5 無 of a 16 然 adenosine triphosphate (ATP) (Promega, cat #V915B) and 9.3 然 Myelin Basic Protein (MBP) (SignalChem, cat #M42-51N) substrate solution in assay buffer was added and the reaction mixture was incubated for 6 hours at RT. The final concentration of PLK4, ATP and MBP in the reactions were 0.5 nM, 8.0 然 and 4.7 然, respectively. Reactions were stopped and the remaining ATP depleted by adding 10 無 of ADP-Glo reagent (Promega, cat#V912B) and incubating for 40 minutes at RT. The simultaneous conversion of the remaining ADP to ATP and measurement of the newly synthesized ATP was achieved by addition of 20 無 Kinase Detection reagent (Promega, cat #V914B), incubation for 30 min at RT, and luminescence detection using the EnVision plate reader (PerkinElmer). Reactions lacking PLK4 were used as 100% inhibition controls. Reactions containing DMSO alone were used as 0% inhibition controls. The IC50 values reported in Table 2 were determined using four parameter non-linear regression curve fit. |
| Affinity data for this assay | |
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