CHEMBL3706090

Inhibition Assay: Zero point five μL of the test compounds (dissolved in N,N′-dimethylsulfoxide) were incubated with 48.5 μL of the fluorescence-quenched peptide substrate solution (Biotin-XSEVNLDAEFRHDSGC-Eu: X=εe-amino-n-capronic acid,Eu=Europium cryptate) and 1 μL of recombinant human BACE-1 protein (R&D systems) for 3 h at 30° C. in the 96 well half-area plate (black color plate,Costar). The substrate peptide was synthesized by reacting with Biotin-XSEVNLDAEFRHDSGC (Peptide Institute) and Cryptate TBPCOOH mono SMP (CIS bio international). The final concentration of the substrate peptide and recombinant human BACE-1 protein were 18 nM and 7.4 nM, respectively. The enzymatic reaction was performed in sodium acetate buffer (50 mM sodium acetate (pH 5.0), 0.008% Triton X-100). After the reaction, a 50 μL of 8.0 μg/mL Streptavidin-XL665 (CIS bio international) dissolved in phosphate buffer (150 mM K2HPO4KH2PO4 (pH 7.0), 0.008% Triton X-100, 0.8 M KF) was added.