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| | Inhibition by Candidate Inhibitors (Low) |
| Description: | Fluorescently-labeled inhibitor probe was synthesized and tagged with BODIPY FL (Example 46). Cbl-b displacement assays were performed in a 384-well plate at room temperature in a 10 μL reaction volume by pre-incubating 0.125 nM Cbl-b in an assay buffer containing 20 mM HEPES pH 7.5, 150 mM NaCl, 0.01% Triton X-100, 0.01% BSA, and 0.5 mM TCEP in the presence of a candidate compound in 1% DMSO (final concentration) for 1 hour. After incubation in the presence of the candidate compound, the plate was incubated for an additional 1 hour in the presence of an approximate EC40 binding saturation consisting of 150 nM fluorescently-labeled inhibitor probe and 2 nM Streptavidin-Terbium (Cisbio) (final concentrations). Following the 1 hour incubation, the plates were read for TR-FRET signal at 520/620 nM using an Envision plate reader (Perkin Elmer). The presence of a TR-FRET signal indicated that the probe was not displaced from Cbl-b by the compound candidate. The absence of a FRET signal indicated that the probe was displaced from Cbl-b by the compound candidate. |
| Affinity data for this assay | |
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