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Assay Method Information |
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| | Binding Assay (BRD4-1) |
| Description: | The bromodomain binding assays were performed by Reaction Biology Corp., Malvern, Pa., USA (www.reactionbiology.com). The BET binding assays were conducted in 384 well microplates in assay buffer (50 mM HEPES-HCl, pH 7.5, 100 mM NaCl, 1 mg/ml BSA, 0.05% CHAPS, and 0.5% DMSO) with compounds added as DMSO stocks at a single concentration or with 10-point dose response titrations. BET protein (20 nM for BRD4) or assay buffer were delivered to the appropriate wells of the microplate. Test compound (20 nM) was then delivered by acoustic technology via a Labcyte Echo550 liquid handler. The microplate was centrifuged for 5 min and pre-incubated for 30 min at RT with gentle shaking. The ligand (histone H4 peptide (1-21) K5/8/12/16Ac-biotin) was delivered and the microplate was again centrifuged for 5 min and allowed to incubate for 30 min at RT with gentle shaking. Donor beads were then added in the absence of light and the microplate was centrifuged and gently shaken. After 5 min, acceptor beads were added in the absence of light and the microplate was centrifuged and gently shaken in the dark for 60 min. The microplate was read using a Perkin Elmer EnSpire Alpha plate reader (λ Ex/λ Em=680/520-620 nm). Percent inhibition was calculated relative to positive and negative controls on a per plate basis. |
| Affinity data for this assay | |
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