| Assay Method Information | |
| | Alphascreen Preincubation Assay |
| Description: | AlphaScreen was conducted with 10 g/mL of glutathione donor beads (PerkinElmer, Waltham, MA) and nickel chelate acceptor beads (PerkinElmer) in 10 mM Bis-Tris (pH 7.0), 1 mM TCEP, 0.02% casein, and 0.1% Tween-20. Compounds were plated first followed by addition of one the proteins at 600 nM and incubation for 30 min. The second protein was added and incubated for 30 mn, then the beads were added simultaneously and the final mixture was incubated for 2 hours. Experiments were conducted in 384-well plates (6007290; PerkinElmer) and results were read on a PHERAstar plate reader (BMG Labtech, Cary, NC).h. Isothermal Titration CalorimetryPurified full-length Tau and FynSH3 were dialyzed into 20 mM Tris and 150 mM NaCl, pH 8.0 with Slide-A-Lyzer G2 Dialysis Cassettes with 10K MWCO (ThermoFisher #87729). Cassettes were hydrated in buffer for 2 minutes before purified protein was injected using an 18-gauge needle. Cassettes were placed in 500 mL buffer with a stir bar and stirred for two hours. Buffer was discarded and replaced for two more hours then replaced again and the samples were dialyzed overnight, all at 4° C. Protein concentrations were measured on a Nanodrop2000 (ThermoFisher) based on absorbance at 280 nm. Before ITC, solutions were brought to 5% DMSO to match amount needed for compound no. 69 preparation.ITC experiments were performed on an Auto-iTC200 system (Malvern Instruments, Westborough, MA). ITC sample cell contained ˜120 μM full-length Tau, FynSH3, or Tau-PxxP5/6 (titrand), and the syringe contained 1 mM compound no. 69 (titrant). Each titration experiment consisted of 16 injections of 2.5 ELL of titrant into titrand at 25° C. Background mixing heat was determined from injections of titrant into the same buffer without titrand. |
| Affinity data for this assay | |
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