Orally active fusion inhibitor of respiratory syncytial virus.

Academic Article


  • BMS-433771 was found to be a potent inhibitor of respiratory syncytial virus (RSV) replication in vitro. It exhibited excellent potency against multiple laboratory and clinical isolates of both group A and B viruses, with an average 50% effective concentration of 20 nM. Mechanism-of-action studies demonstrated that BMS-433771 inhibits the fusion of lipid membranes during both the early virus entry stage and late-stage syncytium formation. After isolation of resistant viruses, resistance was mapped to a series of single amino acid mutations in the F1 subunit of the fusion protein. Upon oral administration, BMS-433771 was able to reduce viral titers in the lungs of mice infected with RSV. This new class of orally active RSV fusion inhibitors offers potential for clinical development.
  • Published In


  • Animals, Antiviral Agents, Benzimidazoles, Chromosome Mapping, Cloning, Molecular, DNA, Complementary, Drug Resistance, Viral, Genotype, Giant Cells, Mice, Mice, Inbred BALB C, Molecular Sequence Data, Respiratory Syncytial Virus Infections, Respiratory Syncytial Viruses, Temperature, Viral Fusion Proteins, Viral Plaque Assay, Viral Proteins
  • Digital Object Identifier (doi)

    Author List

  • Cianci C; Yu K-L; Combrink K; Sin N; Pearce B; Wang A; Civiello R; Voss S; Luo G; Kadow K
  • Start Page

  • 413
  • End Page

  • 422
  • Volume

  • 48
  • Issue

  • 2