Originating from our nucleos(t)ide discovery capabilities, bemnifosbuvir (AT-527) is an oral direct-acting antiviral being evaluated in SUNRISE-3, a global Phase 3 registrational trial for the treatment of COVID-19. Bemnifosbuvir targets the SARS-CoV-2 RNA polymerase (nsp12), a highly conserved enzyme that is unlikely to change as the virus mutates and new variants continue to emerge. This enzyme is responsible for both transcription and replication of SARS-CoV-2. Bemnifosbuvir has a unique mechanism of action, with dual targets consisting of inhibition of RNA dependent RNA polymerase (RdRp) and nucleotityltransferase (NiRAN) inhibition, which has the potential to create a high barrier to resistance.
Bemnifosbuvir + ruzasvir
In addition to COVID-19, bemnifosbuvir is also being developed in a Phase 2 clinical trial in combination with ruzasvir, an NS5A inhibitor, for the treatment of hepatitis C virus (HCV). As single agents, both bemnifosbuvir and ruzasvir have demonstrated potent pan-genotypic antiviral activity against HCV.