| Assay Method Information | |
| | PARP Mass Spectroscopy Assay |
| Description: | PARP1 enzymatic assays were performed in 384-well plates in a total volume of 20 μL in the assay buffer. For concentration response curves, compounds were serially diluted 3-fold from 2 mM highest concentration 0.1013 mM to generate a 10-point curve, and 125 nL was transferred to the assay plate using the Echo acoustic dispenser for a final concentration range of 26.6 μM to 1.35 μM in 10 μL reaction. Five microliters of 10 nM PARP1 enzyme and 100 nM core histones (2×) mix were added to the assay plates and pre-incubated for 30 mins at room temperature (RT). The reaction was initiated by the addition of a 5 μL of 10 uM β-NAD plus 0.02 mg/mL activated DNA (2×) mix. The reaction is incubated for 60 min at RT. The final concentration of the PARP1 enzyme and substrate concentrations were 5 nM and 5 uM, respectively. The positive control (high signal) and negative control (low signal) wells had 125 nL of DMSO in place of compounds. After the incubation is complete, the reaction is stopped by the addition of 10 μL of 10 uM of the 3ABA PARP1 inhibitor, incubated for 5 min at RT, and placed in the −80 C freezer for shipment to the Valo Health site in Branford Connecticut where mass spectrometry will be used to directly detect quantities of nicotinamide (NAM). |
| Affinity data for this assay | |
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