| Assay Method Information | |
| | Cbl-b and C-cbl LCK Ub TR-FRET Assay |
| Description: | Compounds were 3-fold serially diluted in DMSO in a 384-well polypropylene plate (#P-05525-BC; Labcyte) to generate a source plate with 10 concentrations of each compound, top concentration=2 mM. 80 nL of DMSO or compounds were transferred to each well of a black 384-well ProxiPlate (#6008260; PerkinElmer) using a Labcyte Echo. 1× assay buffer (50 mM HEPES pH7.0, 100 mM NaCl, 0.01% BSA, 0.01% Triton-X100, 1 mM DTT), 2× enzyme solution (16 nM Biotin-Cbl-b or 12 nM Biotin-c-Cbl in 1× assay buffer), 2× kinase mixture (120 nM His-LCK, 1 mM ATP, 10 mM MgCl2 in assay buffer) and 2.33× detection mixture (4.66× solution 1: 163 nM Anti-HA-D2 antibody (#610HADAB; PerkinElmer), 27.96 nM Streptavidin-EU (#AD0062; PerkinElmer), 1.398 mM EDTA in 1× assay buffer+4.66× solution 2: 2.796 μM UBE2D2/Methylated-HA-Ubiquitin thioester adduct (BostonBiochem) in 1× assay buffer) were prepared. 4 μL of 2× enzyme solution was added to each well containing compound, briefly centrifuged to mix, and incubated for 60 min at room temperature. 4 μL of 2× kinase mixture was added, briefly centrifuged to mix, and incubated for 90 min. at room temperature. 6 μL of detection mixture was added to all wells and briefly centrifuged before incubating for 20 min at room temperature. Plates were read for TR-FRET using an Envision at excitation 340 nm, emission at 615 and 665 nm, 4 flashes per well. IC50 was generated using no LCK as the low control and DMSO as the high control. |
| Affinity data for this assay | |
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