| Assay Method Information | |
| | DNA-PK Assay for Biochemical Enzymatic Inhibition |
| Description: | A biochemical assay was performed to identify IC50 values against DNA-PK activity in a two-step reaction with a kinase reaction followed by ADP Glo™ Kinase assay Kit (Promega V9102). Three-fold serial dilutions of compounds in DMSO were prepared in kinase assay buffer (50 mM HEPES pH 7.5, 20 mM MgCl2, 100 mM KCl, 50 μM DTT, 10 μg/ml calf thymus DNA, 0.01% Tween 20). Kinase assay buffer was used to prepare compound treatments to 0.02% DMSO (dimethyl sulphoxide) content. DMSO controls were prepared to produce a maximum and minimum luminescence signal for normalization. Substrate (Anaspec, AS-60210-5) and ATP (Promega V9102) and ATP mix was prepared by dilution in kinase assay buffer for 434.4 μM and 64.4 μM final assay concentrations, respectively. Compounds and control were added to 25 ng DNA-PK enzyme (Invitrogen, PR9107A) diluted in kinase buffer in assay plate (Corning 267459) and incubated for 15 minutes at room temperature prior to addition of substrate and ATP mix. Throughout the assay, each time a reagent was added to the microplate, it was centrifuged for 1 minute at 1300 rcf. All reagents were added, and incubations carried out at room temperature. The reaction was then incubated for 60 minutes. ADP-ATP standards at 0, 4, 10, 40, 80, and 100% ADP (prepared as specified in the ADP Glo™ Kinase assay kit) were also added to the microplate at a volume equal to the total kinase reaction. The ADP Glo™ Kinase Assay kit was then used to quantify DNA-PK activity: following the 60-minute incubation, a 1:1 volume of ADP Glo reagent was added to all wells, then following a further 45-minute incubation, a 1:1 volume of Kinase Detection Reagent was added to all wells. After this two-step assay, plates were incubated in a Synergy-Neo2 plate reader for 30 minutes with gentle shaking, followed by endpoint luminescent read Luminescence data was normalized by subtracting the background signal and expressing all background-adjusted values as a percentage of the average maximum signal. |
| Affinity data for this assay | |
|---|---|
| If you find an error in this entry please send us an E-mail | |