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Assay Method Information

Assay Name:  Enzyme Inhibition Assay
Description:  The enzyme inhibitory activity of compound was determined by FRET using synthetic peptides labelled with both donor and acceptor fluorophores (Z-LYTE, Invitrogen Ltd., Paisley, UK). Recombinant, phosphorylated p38 MAPK γ (MAPK12:Millipore) was diluted in HEPES buffer, mixed with compound at desired final concentrations and incubated for two hours at room temperature. The FRET peptide (2 μM) and ATP (100 μM) were next added to the enzyme/compound mixture and incubated for 1 hr. Development reagent (protease) was added for 1 hr prior to detection in a fluorescence microplate reader (Varioskan Flash, ThermoFisher Scientific). The site-specific protease cleaves only non-phosphorylated peptide and eliminates the FRET signal. Phosphorylation levels of each reaction were calculated using the ratio of coumarin emission (donor) over fluorescein emission (acceptor) with high ratios indicating high phosphorylation and low ratios, low phosphorylation levels. The percentage inhibition of each reaction was calculated relative to non-inhibited control, and the 50% inhibitory concentration (IC50 value) then calculated from the concentration-response curve.
Affinity data for this assay
 

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Last update November 1, 2007
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