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Assay Method Information

Assay Name:  Temperature Dependence Fluorescence Assay (TdF)
Description:  The SAR (Structure Activity Relationship) for ERK ligands covered by this invention was interrogated using the TdF (Temperature Dependence Fluorescence) assay or best known as thermal shift assay [1]. The TdF assay was mainly conducted in the 96-well based CHROMO-4 real time fluorescence plate reader (BioRad). The Sypro Orange (Sigma-Aldrich), environmentally sensitive fluorescence dye, was used to monitor the protein folding-unfolding transition. Protein-ligand binding was gauged by the change (or shift) in the unfolding transition temperature (DTm) acquired at protein alone with respect to protein in the presence of ligand of interest.Compound of interest was first prepared in DMSO stock (typical concentration: 10 mM). Sample of 20 uL was then added into the 96-well PCR plate, where it consisted of 3 uM ERK protein and 15, 50 or 100 uM compound (depending on compound's solubility) in buffer (25 mM HEPES, 150 mM NaCl, pH=7.5 and 1 mM DTT).
Affinity data for this assay
 

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Last update November 1, 2007
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