PPNDS inhibits murine Norovirus RNA-dependent RNA-polymerase mimicking two RNA stacking bases.
Croci, R., Tarantino, D., Milani, M., Pezzullo, M., Rohayem, J., Bolognesi, M., Mastrangelo, E.(2014) FEBS Lett 588: 1720-1725
- PubMed: 24657439 
- DOI: https://doi.org/10.1016/j.febslet.2014.03.021
- Primary Citation of Related Structures:  
4O4R - PubMed Abstract: 
Norovirus (NV) is a major cause of gastroenteritis worldwide. Antivirals against such important pathogens are on demand. Among the viral proteins that orchestrate viral replication, RNA-dependent-RNA-polymerase (RdRp) is a promising drug development target. From an in silico-docking search focused on the RdRp active site, we selected the compound PPNDS, which showed low micromolar IC50vs. murine NV-RdRp in vitro. We report the crystal structure of the murine NV-RdRp/PPNDS complex showing that two molecules of the inhibitor bind in antiparallel stacking interaction, properly oriented to block exit of the newly synthesized RNA. Such inhibitor-binding mode mimics two stacked nucleotide-bases of the RdRp/ssRNA complex.
Organizational Affiliation: 
Department of Biosciences, University of Milano, Via Celoria 26, I-20133 Milano, Italy.