CHEMBL3888965

Surface Plasmon Resonance (SPR)-Based Assay: All measurements were performed on a Biacore T100 instrument (GE Healthcare). The purified HIS6-tagged NS5BΔC21 polymerases were immobilized using non-covalent capturing to an NTA sensor chip (GE Healthcare) in immobilization buffer (20 mM MOPS pH 7.4, 500 mM NaCl, 0.005% Tween-P20, 1 mM DTT, 50 μM EDTA). Interaction studies were all performed at 25° C. Inhibitors were serially diluted in running buffer (20 mM Tris-HCl pH 7.4, 150 mM NaCl, 50 μM EDTA, 1 mM DTT, 0.005% Tween-P20) containing 5% dimethyl sulfoxide (DMSO). Single-cycle kinetics were used, in which 5 increasing concentrations of compound were injected for a period of 300 s each in 1 single cycle, and dissociation was monitored for a period of 1200 s. The sensor surface was completely regenerated in between the cycles.