Assay Method Information

Assay Name:  Amplified Luminescent Proximity Homogeneous Assay
Description:  Compounds were tested in biochemical protein-protein interaction assays to determine if they can specifically block the interaction between the extracellular domains of PD-1/PD-L1 or CTLA/CD80. Binding of the protein pairs is measured using a bead based Amplified Luminescent Proximity Homogeneous Assay (ALPHA) platform. Binding of each protein pair results in proximity of the donor and acceptor beads which leads to an increase in ALPHA signal. Disruption of the protein-protein interaction with a test compound results in a decrease in ALPHA signal. Assays are performed in 25 mM Hepes (pH 7.4), 150 mM NaCl, 3.4 mM EDTA, 0.005% Tween 20, and 0.01% BSA. Final protein concentration in the assays were 0.3 nM (His tagged PD-L1), 2.5 nM (biotinylated Fc-PD-1), 1 nM (His tagged CTLA4) and 1 nM (biotinylated CD80). After an assay reaction time of 60 minutes at 25° C., binding was measured with addition of 20 μg/mL ALPHA assay acceptor beads (anti-His coated) and 20 μg/mL ALPHA assay donor beads (streptavidin coated).
Affinity data for this assay
 

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