| Assay Method Information | |
| | Binding Assay |
| Description: | Human eIF4E (aa 28-217) with a C-terminal His tag (HH-eIF4E) was expressed in E. coli in inclusion bodies. The protein was solubilized with 8 M urea and purified under denaturing conditions using nickel-charged HisTrap HP columns (GE Healthcare). The protein was refolded by diluting to approximately 0.25 mg/mL with 6 M urea, 20 mM Hepes pH 7.0, 500 mM NaCl, 1 mM DTT, 1 mM EDTA, and 0.5 M arginine HCl, and then dialyzing overnight into the same buffer without the urea. The protein was further dialyzed into 20 mM Hepes pH 6.5, 50 mM NaCl, 1 mM EDTA, and 1 mM DTT, filtered, and then concentrated using Hitrap SP sepharose FF columns (GE Healthcare). The protein was dialyzed into 20 mM Hepes pH 7.0, 500 mM NaCl, 5 mM DTT, and 10% glycerol and stored at -80 °C until use. Test compounds (1.6 mM stock in DMSO) were diluted 3 fold in series in DMSO. Compound solutions were diluted 4 fold in Assay Buffer (50 mM sodium phosphate, pH 6.5, 50 mM KC1, 1 mM DTT and 0.5 mg/mL gammaglobulin). |
| Affinity data for this assay | |
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