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Characterization and structure-activity relationship analysis of a class of antiviral compounds that directly bind dengue virus capsid protein and are incorporated into virions.
Antiviral Research 2018 July
Dengue viruses (DENV) are endemic pathogens of tropical and subtropical regions and cause significant morbidity and mortality worldwide. Although a partially effective vaccine is in use in several countries in which DENV are endemic, no antiviral therapeutics are approved for combating DENV-associated disease. Herein, we report the characterization of novel small molecule inhibitors of DENV replication, VGTI-A3 and VGTI-A3-03, as well as structure-activity relationship analysis of the molecules using a panel of chemical analogs. VGTI-A3 and VGTI-A3-03 are highly virus-specific, with greatest activity against DENV serotype 2. Further analysis revealed that treatment of infected cells with VGTI-A3-03 does not inhibit viral RNA replication or secretion of viral particles. Rather, the infectivity of secreted particles from A3-03 treated cells is significantly diminished compared to particles secreted from control cells. Elicitation of VGTI-A3-03-resistant mutants demonstrated a clear binding pocket in the capsid molecule at the dimerization interface. Additionally, we show that VGTI-A3-03 is incorporated into virus particles released from infected cells. In summary, these data provide detailed analysis of a potentially useful class of anti-DENV inhibitors and further identify a region of the viral capsid protein as a druggable target for other therapeutic approaches.
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