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. 2020 Nov 17;3(6):1352–1360. doi: 10.1021/acsptsci.0c00161

Table 2. Detailed TruHits AlphaLISA Counterassay Protocol.

step no. process notes
1 Compounds and controls (20 nL) were predispensed into 1536-well plates. Compound transfer was performed using an ECHO 650 acoustic dispenser (LabCyte). Compounds in doses were dispensed to columns 5–48, and controls were dispensedto columns 1 using 1536-well plates (catalog no. EWB010000A, Aurora Microplates).
2 Dispensed 3 μL of biotin-BSA acceptor beads to all wells, except column 2. 2× biotin-BSA acceptor beads (0.02 mg/mL, TruHits kit catalog no. 6760627, PerkinElmer) in PBS (catalog no. 10010–031, ThermoFisher) + 0.05 mg/mL BSA (catalog no. BP1600-1, Fisher Scientific)
3 Incubated at RT for 30 min and 200 rpm shaking. incubation of Biotin-BSA acceptor beads with test compounds
4 Dispensed 3 μL of streptavidin donor beads to wells, except column 3. 2× streptavidin donor beads (0.02 mg/mL, TruHits kit catalog no. 6760627, PerkinElmer) in PBS (catalog no. 10010–031, ThermoFisher) in PBS + 0.05 mg/mL BSA
5 Incubated at RT for 30 min and 200 rpm shaking. Streptavidin–biotin complex formation. Final assay conditions: 10 μg/mL streptavidin donor beads, 10 μg/mL Biotin-BSA acceptor beads in PBS + 0.05 mg/mL BSA
6 Read on PHERAstar FSX (BMG Labtech). Fastest read settings, AlphaLISA Module (680 nm excitation, 615 nm emission) (catalog no. 1802H1, BMG Labtech)