| Assay Method Information | |
| | Diamine Oxidase (DAO) Selectivity Assay |
| Description: | ReagentsPromega ROS-Glo H2O2 Assay Kit, 50 ml. Cat No. G8821Inhibitors (Test Compounds):10 mM stock diluted to 10, 3, 1, 0.3, 0.1, 0.03, 0.01, 0.003, 0.001, and 0.0003 mM in drug plate, resulting in a concentration of 100, 30, 10, 3, 1, 0.3, 0.1, 0.03, 0.01, and 0.003 uM in the assay.Positive Control (Aminoguanidine):1 mM stock diluted to 1 to 0.0001 and 0.00003 mM in drug plate, resulting in a concentration of 3 to 0.001 and 0.0003 uM in the assay.DAO:DAO batch is obtained from Sigma Enzyme is reconstituted in sodium phosphate buffer at 10 mg/mLAssay Plates: 96 well white polystyrene, flat bottom plates: Fisher, Cat No. DPS-134-050AProcedure:1. Dilute 400 ul DAO enzyme in 4 mL Assay Buffer (enough for one plate). Add 40 ul DAO enzyme to all wells (excluding G+H 12, assay buffer only)3. Add 0.5 μl test compound serial dilutions, in duplicate4. Add 0.5 μl serial dilutions of Aminoguanidine down column 11 and to E+F 125. Add 0.5 μl DMSO (100% activity control) to C+D 126. Cover plate and incubate for 20 minutes at room temp on a plate shaker7. Prepare Start Mix: Volume Reagent 1 × plate 2 × plate Final ConcnAssay Buffer 2 ml 3 ml —8.5M Cadaverine 23 μl 34.5 μl 97.8 mMH2O2 Substrate (1:80) 25 μl 37.5 μl 125 μM8. Add 10 μl Start Mix to all wells9. Incubate for 60 min at room temp on a plate shaker10. Prepare Detection Reagent: Volume Reagent 1 × plate 2 × plate Luciferin 5 ml 10 ml D-cysteine (1:100) 50 μl 100 μl Signal Enhancer (1:100) 50 μl 100 μl11. Add 50 μl Detection Regent to each well EXCEPT No Luciferin controls (A+B 12, add 50 μl assay buffer)12. Incubate for 20 min at room temp on a plate shaker, protected from light13. Measure luminescence using a plate reader (integration 500 ms)Values for the blank (no DAO controls) are subtracted from all samples. DMSO controls are set as 100% activity and samples are calculated as a % of the DMSO control. Data is plotted using Graphpad Prism software, and a non-linear regression line is calculated using a variable slope sigmoidal dose response equation.:Y=Bottom+(Top-Bottom)/(1+10{circumflex over ( )}((LogIC50−X)*HillSlope)).Where X is the logarithm of concentration and Y is the response. The IC50 is the concentration of the drug that produces a percentage control fluorescence value midway between the saturation and zero effect plateaus. Two independent assays are usually performed, and the mean IC50 is reported. |
| Affinity data for this assay | |
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