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| | EPX Bromination Assay |
| Description: | EPX bromination activity was measured in 100 mM KPi (pH 7.4) by monitoring the H2O2 catalyzed formation of 3-bromo tyrosine from tyrosine and potassium bromide. A 50 μl mixture of 0.6 μM EPX (Lee Biosolutions Cat. #342-60) was added to 100 nL inhibitor in 100% DMSO in a 384 well REMP plate. Enzyme and compound were preincubated for ten minutes at room temperature.After the ten minute preincubation of enzyme and inhibitor, 25 μL of a mixture containing 400 μM tyrosine and 1200 μM potassium bromide was added to the plate containing enzyme and inhibitor, followed by the addition of 25 μl of 20 μM H2O2. The reaction was allowed to proceed for 15 minutes, at which time it was quenched with 10 μL of 20% TCA. The final concentrations of all components were 0.3 μM EPX, 100 μM tyrosine, 400 μM potassium bromide, 5 μM H2O2, 0.1% DMSO, 2.0% TCA. |
| Affinity data for this assay | |
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