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| | SPR Assay to Determine Binding Affinity to FKBP51 |
| Description: | Biotinylated avi-FKBP51 was immobilized on a streptavidin chip (Cytiva Series S SA) using a Biacore 8K or 8 k+ (Cytiva). To achieve an immobilization level of 2000 RU, 3 μg/ml biotinylated avi-FKBP51 were injected for 360 sec at a flow rate of 10 μl/min. Rapalogs were diluted in DMSO to 100× working concentration. Each Rapalog was 100-fold diluted in 50 mM HEPES pH 7.5, 150 mM NaCl, 2 mM MgCl2, 1 mM DTT, 0.05% Tween-20 and a serial dilution prepared (8 concentrations, 3-fold dilutions, 0.5-1000 nM). Rapamycin was used as reference sample (8 concentrations, 3-fold dilutions, 0.5-1000 nM). The compound dilutions were then injected at 100 uL/min for 120 seconds contact time and with 3600 seconds dissociation time with increasing concentrations. 50 mM HEPES pH 7.5, 150 mM NaCl, 2 mM MgCl2, 1 mM DTT, 0.05% Tween-20, 1% DMSO was used as running buffer. Multi-cycle kinetics data were fit to a 1:1 binding model to measure the association rate ka (1/Ms), the dissociation rate kd (1/s) and the affinity Kd (M). |
| Affinity data for this assay | |
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