Screening anti-TMV agents targeting tobacco mosaic virus helicase protein

Tobacco mosaic virus helicase (TMV-Hel) plays important roles in viral multiplication. TMV-Hel is a potential target of anti-TMV agents. Our previous studies expressed and purified TMV-Hel as target protein for cytosinpeptidemycin. In this study, we preform molecular docking to study the binding sites of commercial antiviral agents with TMV-Hel. Then we verify the interactions between the potential anti-TMV agents and TMV-Hel in vitro using Microscale Thermophoresis experiment and study the inhibiting expression of TMV-Hel with the potential anti-TMV agents in vivo using Western-blot (WB) method. The results showed that ribavirin bound to TMV-Hel with a dissociation constant of 1.55 μM by direct interaction with eight binding sites, which was consistent with the docking studies. Ribavirin inhibited the expression of TMV-Hel in Nicotiana benthamiana. Docking studies combined Microscale Thermophoresis and WB experiment provided a new method to screen anti-TMV agents targeting TMV-Hel.