| Assay Method Information | |
| | AlphaLISA Assay |
| Description: | Inhibition of the MCL1 and Bim interaction was measured in the following AlphaLISA assay.Recombinant human MCL1 protein (C-terminal 6×His Tagged MCL1 containing residues 171-327) was generated at Gilead Sciences, Inc. (Foster City, Calif.). A biotinylated peptide derived from human Bim (residues 51-76) was purchased from CPC Scientific (Sunnyvale, Calif.). (CPC 834113). AlphaLISA anti-6His- acceptor beads (AL128R), AlphaScreen Streptavidin donor beads (6760002B), and Proxiplate-384 Plus (6008289) were purchased from PerkinElmer. Methods: The AlphaLISA assay was performed in a 384-well Proxiplate in a total volume of 40 μL. The reaction mixture contained 0.0625 nM 6×His-MCL1 (171-327), 0.0625 nM biotinylated-Bim peptide, 10 μg/mL AlphaLISA anti-6×His-AlphaLISA acceptor beads, 40 μg/mL AlphaScreen streptavidin donor beads, and serially diluted test compounds in the binding buffer (20 mM Hepes, pH 7.5 (Teknova H1035); 150 mM NaCl (Promega V4221); 0.002% Brij 35 (Thermo Scientific 20150); 1 mM Dithiothreitol (DTT) Solution (Affymetrix 70726); 0.01% BSA (BioLabs B9000S)). 1,000× test compounds were pre-spotted onto 384-well Proxiplate (Labcyte Echo) by Echo 555 Liquid Handler (Labcyte Inc., San Jose, Calif.) followed by incubation of 5 μL MCL1(171-327) for 1 hour. Then 5 μL Bim (51-76) was added and incubated for 2 hours. Five μL AlphaLISA anti-6His-AlphaLISA acceptor beads were then added for 1 hour followed by addition of 5 μL AlphaScreen streptavidin donor beads for 1 hour. The reaction plates were then read on an Envision multimode reader (PerkinElmer) using AlphaScreen settings |
| Affinity data for this assay | |
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