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Flaviviruses are small, enveloped RNA viruses which cause a variety of diseases into animals and man. Despite the existence of licensed vaccines, yellow fever, Japanese encephalitis and tick-borne encephalitis also claim many thousands of victims each year across their vast endemic areas. A number of studies have already revealed that the non-structural NS3 serine protease is required for the maturation of the viral polyprotein and thus is a promising target for the development of antiviral inhibitors. Hence, the 3D structure of NS3 protein was modeled using homology modeling by MODELLER 9v7. Validation of the constructed NS3 protein models were done by PROCHECK, VERYFY3D and through ProSA calculations. Ligands for the catalytic triad (H51, D75, and S135) were designed using LIGBUILDER. The NS3 protein's catalytic triad was explored to find out the interactions pattern for inhibitor binding using molecular docking methodology using AUTODOCK Vina. The interactions of complex NS3protein-ligand conformations, including hydrogen bonds and the bond lengths were analyzed using Accelrys DS Visualizer software. Hence, from this observation, the novel molecule designed was observed to be the best ligand against the NS3 protein of flavivirus. This molecule may prove to be a potential identity in modulating disease manifestation for all the selected flavivirus members.

In silico modeling of ligand molecule for non structural 3 (NS3) protein target of flaviviruses