Mode of inhibition by G05 compound. (a) Naïve Huh7 cells were treated with various concentrations (up to 100 μM) of G05 compound and the viability was measured with standard MTT assay. (b) Huh7 cells harboring the HCV subgenomic replicon were treated with G05 compound at a concentration of 5 15 or 30 μM. After 72 hours of incubation the amounts of (+) and (-) sense replicon RNA were measured using a real-time RT-PCR. (b) [32P]-UMP incorporation measured after 90 minutes of incubation in the presence of G05 at 0 1.7 and 13.5 μM in concentration. (c) The same assay with G05 at 0.1 0.25 and 0.5 μM in concentration and displayed as a Lineweaver-Burk plot. [I] concentration of G05 compound.