Inhibition of the helicase activity of HCVNTPase/helicase by 1-beta-D-ribofuranosyl-1,2,4-triazole-3-carboxamide-5 '-triphosphate (ribavirin-TP)

In the presented study the ribavirin-TP - an established inhibitor of the N TPase activity of the superfamily NTPase/helicases II - was investigated as an inhibitor of the unwinding activity of the hepatitis C virus (HCV) NTPa se/helicase. The kinetics of the reaction revealed that ribavirin-TP reduce s the turnover number of the helicase reaction by a mechanism that does not correspond to that of the inhibition of the NTPase activity. Our results s uggest that derivatives of ribavirin-TP with enhanced stability towards hyd rolytic attack may be effective inhibitors of the enzyme.