| Assay Method Information | |
| | Cell Free Mcl-1: Bim Affinity Assay (Mcl-1 HTRF) |
| Description: | The inhibition of the Mcl-1/Bim interaction was measured using a time-resolved fluorescence resonance energy transfer (TR-FRET) assay. The recombinant human Mcl-1 (C-terminally 6×His tagged Mcl-1 containing residues 171-327) was generated at Amgen Inc (Thousand Oaks, Calif.). A biotinylated peptide derived from human Bim (residues 51-76) was purchased from CPC Scientific (San Jose, Calif.). The TR-FRET assay was conducted in a 384-well white OptiPlate (PerkinElmer, Waltham, Mass.) in a total volume of 40 μL. The reaction mixture contained 0.1 nM Mcl-1(171-327), 0.05 nM biotin-Bim(51-76), 0.05 nM LANCER Eu-W1024 Anti-6×His (PerkinElmer), 0.072 nM Streptavidin-Xlent (Cisbio, Bedford, Mass.), and serially diluted test compounds in the binding buffer of 20 mM Hepes, pH 7.5, 150 mM NaCl, 0.016 mM Brij 35, and 1 mM dithiothreitol. Test compounds were pre-incubated with Mcl-1(171-327) and biotin-Bim (51-76) for 60 min before addition of the detection mixture (LANCE Eu-W1024 Anti-6×His and Streptavidin-Xlent). The reaction plates were further incubated overnight and then were read on an Envision multimode reader (PerkinElmer). Fluorescence signals were measured at 620 nm (40-nm bandwidth) and 665 nm (7.5-nm bandwidth) with a 60 μs delay after excitation at 320 nm (75-nm bandwidth). The signal ratio at 665/620 nm corresponded to the Mcl-1/Bim interaction and was used in all data analyses. The IC50 values of test compounds were determined from duplicate data by analyzing competition curves using a four-parameter sigmoidal model in GraphPad Prism (GraphPad Software, San Diego, Calif.) or in Genedata Screener (Genedata, Basel, Switzerland). |
| Affinity data for this assay | |
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