Assay Method Information

Assay Name:  MALT1 Inhibition Assay
Description:  The standard reagent formulations used in this assay were prepared and stored as follows. A 1.1 M solution of sodium citrate (161.3 g, 500 mL) was prepared and stored at room temperature. A 10% (w/v) CHAPS solution (2.0 g, 20 mL) was prepared and stored at 4° C. A 500 mM HEPES solution having pH of 6.89 was prepared from 200 mL of a 1 M HEPES solution having a pH of 7.5 using concentrated hydrochloric acid and brought to a final volume of 400 mL with MILLI-QR H2O. The substrate, 10 mM Ac-LRSR-AMC Peptide, was prepared (10 mg, 1.370 mL DMSO) and stored at −20° C.Compounds were plated to provide a 2% DMSO final concentration using a ProxiPlate-384 Plus F Black 384-shallow well microplate. The assay-ready plates were equilibrated to room temperature. A reaction buffer (30 mL total volume) was prepared by combining HEPES (pH 6.89, 25 mM, 1.5 mL), sodium citrate (660 mM, 18.0 mL), T-CEP (1 mM, 0.06 mL), EDTA (0.1 mM, 0.06 mL), CHAPS (0.05%, 0.15 mL), DMSO (2%, 0.6 mL), and MILLI-QR H2O (10.23 mL; 9.63 mL when backfilled to 2% DMSO) followed by thorough mixing. DMSO was added only when compound plates had not been DMSO-backfilled to 2%.MALT-1 was thawed and kept on ice. Peptide substrate was thawed on the bench under ambient conditions. A MALT-1 enzyme working stock was prepared from Avi-tagged FL MALT-1 (40 nM in a prepared reagent volume of 16.5 μL) and the reaction buffer (13.0 mL). MALT1 working stock (5 μL) was added to each well of the microplate. MALT-1 was pre-incubated with compounds for 30 minutes at room temperature.
Affinity data for this assay
 

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