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  • Title: Dengue virus NS3 serine protease. Crystal structure and insights into interaction of the active site with substrates by molecular modeling and structural analysis of mutational effects.
    Author: Murthy HM, Clum S, Padmanabhan R.
    Journal: J Biol Chem; 1999 Feb 26; 274(9):5573-80. PubMed ID: 10026173.
    Abstract:
    The mosquito-borne dengue viruses are widespread human pathogens causing dengue fever, dengue hemorrhagic fever, and dengue shock syndrome, placing 40% of the world's population at risk with no effective treatment. The viral genome is a positive strand RNA that encodes a single polyprotein precursor. Processing of the polyprotein precursor into mature proteins is carried out by the host signal peptidase and by NS3 serine protease, which requires NS2B as a cofactor. We report here the crystal structure of the NS3 serine protease domain at 2.1 A resolution. This structure of the protease combined with modeling of peptide substrates into the active site suggests identities of residues involved in substrate recognition as well as providing a structural basis for several mutational effects on enzyme activity. This structure will be useful for development of specific inhibitors as therapeutics against dengue and other flaviviral proteases.
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