| Assay Method Information | |
| | Protein-Protein Interaction Assay |
| Description: | BCL-XL/Bad BH3 Peptide (BCL-XL Assay): The assay was initiated by addition of 2 μl of a 2.5-fold concentrated His-BCL-XL solution (usually for a 1 nM end concentration in 5 μl reaction volume) in aqueous assay buffer [50 mM Tris/HCl pH 7, 100 mM sodium chloride (NaCl), 50 mM potassium fluoride (KF), 0.005% Tween-20, 2 mM DTT, 0.1% bovine gamma globulin (BGG)] to the compounds in the assay plate. This was followed by a 10-minute incubation step at 22° C. for pre-equilibration of the putative complex between His-BCL-XL and the compounds. After that, 3 μl of a 1.67-fold concentrated solution (in assay buffer) consisting of Bad BH3-derived peptide (1 nM end concentration) and TR-FRET detection reagents [1.67 nM anti-His-Eu cryptate and 1.67 nM streptavidin-XL665 (both from Cisbio Bioassays, Codolet, France)], were added.The mixture was incubated in the dark for one hour at 22° C. and then overnight at 4° C. The formation of BCL-XL/Bad complexes was determined by measuring the resonance energy transfer of the anti-His- Eu-cryptate antibody to the streptavidin-XL665 present in the reaction. For that purpose, the fluorescence emission at 620 nm and 665 nm after excitation at 330-350 nm was measured in a TR-FRET measuring instrument, for instance a Rubystar or a Pherastar (both from BMG Lab Technologies, Offenburg, Germany) or a Viewlux (Perkin-Elmer). The ratio of the emission at 665 nm and at 622 nm was used as indicator of the amount of BCL-XL/Bad complexes present. |
| Affinity data for this assay | |
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