| Assay Method Information | |
| | In Vitro PAD4 BAEE Biochemical Assay |
| Description: | One hundred nanoliters of test compounds dissolved in DMSO at various concentrations were dispensed into a 384-well black OptiPlate using a Labcyte Echo instrument. Ten microliters of a solution of recombinant PAD4 and calcium chloride diluted in PAD4 assay buffer (50 mM MOPS [3-(N-morpholino) propanesulfonic acid], pH 7.6; 50 mM sodium chloride; 0.05% Tween-20; 2 mM dithiothreitol) was added to the compound-containing plate and was incubated for 30 minutes at 25° C. Ten microliters of a solution of BAEE (Sigma-Aldrich #B4500) diluted in PAD4 assay buffer was then added to start the reaction. Final concentrations were 5 nM PAD4, 2 mM calcium chloride, and 3 mM BAEE. The reaction mixture was incubated at 25° C. for 2 hours and was stopped with the addition of 10 microliters of a solution of 75 mM EDTA (Ethylenediaminetetraacetic acid) in PAD4 assay buffer. Thirty microliters of detection solution (5 mM o-phthalaldehyde, 50 mM MOPS [3-(N-morpholino) propanesulfonic acid], pH 7.6; 50 mM sodium chloride; 0.05% Tween-20; 5 mM dithiothreitol) was then added and the reaction was incubated for 1 hour at 25° C. The level of fluorescent thiol-substituted isoindole resulting from the reaction of ammonia, o-phthalaldehyde, and dithiothreitol was measured on an Envision plate reader (PerkinElmer) with 405 nm excitation and 535 nm emission. |
| Affinity data for this assay | |
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