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| | Biochemical TR-FRET Assay |
| Description: | To identify novel antagonists of RORgammaT, an assay was developed which employs the interaction of RORgammaT with its co-activator peptide SRC1_2. This peptide mimics the recruitment of co-activators to RORgammaT through its interaction with the LXXLL (SEQ ID NO:1) (e.g., NR box) motifs (Xie et al., J. Immunol. 175: 3800-09, 2005; Kurebayashi et al., Biochem. Biophys. Res. Commun. 315: 919-27, 2004; Jin et al., Mol. Endocrinology 24:923-29, 2010). The RORγ-Ligand Binding Domain TR-FRET Assay was run according to the following protocol.HIS-tagged RORγ-LBD protein was recombinantly expressed in Escherichia coli. The RORγ-LBD protein was purified by Ni2+-affinity resin. Purified protein was then diluted in assay buffer (50 mM Tris pH 7.0, 50 mM KCl, 1 mM EDTA, 0.1 mM DTT, 100 μg/mL bovine serum albumin, delipidated) to obtain a RORγ-LBD final concentration of 3 nM. Europium tagged anti-HIS antibody was also added to this solution (1.25 nM). Separately, SF9 cells not expressing any recombinant protein were lysed (32,000 cells per μl in 25 mM Tris, 50 mM NaCl) and the previously frozen lysate was added to the diluted RORγ-LBD solution at a ratio of 0.75 μl SF9 lysate per 15 μl of diluted RORγ-LBD. |
| Affinity data for this assay | |
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