Summary Newly emerging or re-emerging viral infections continue to cause significant morbidity and mortality every year worldwide, resulting in serious effects on both health and the global economy. Despite significant drug discovery research against dengue viruses (DENVs) and severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), no fully effective and specific drugs directed against these viruses have been discovered. Here, we examined the anti-DENV activity of tubercidin derivatives from a compound library from Hokkaido University and demonstrated that 5-hydroxymethyltubercidin (HMTU, HUP1108) possessed both potent anti-flavivirus and anti-coronavirus activities at submicromolar levels without significant cytotoxicity. Furthermore, HMTU inhibited viral RNA replication and specifically inhibited replication at the late stages of the SARS-CoV-2 infection process. Finally, we demonstrated that HMTU 5′-triphosphate inhibited RNA extension catalyzed by the viral RNA-dependent RNA polymerase. Our findings suggest that HMTU has the potential of serving as a lead compound for the development of a broad spectrum of antiviral agents, including SARS-CoV-2. Graphical abstract Highlights • We identified tubercidin derivatives as broad-spectrum antiviral compounds • HMTU exhibited potent antiviral activity against flaviviruses and coronaviruses • HMTU specifically inhibited replication at a late stage of the viral infection process • HMTU 5′-triphosphate inhibited RNA extension catalyzed by viral RdRp Drugs; Microbiology; Viral microbiology
【저자키워드】 Microbiology, drugs, Viral microbiology, 【초록키워드】 SARS-CoV-2, viral infection, Drug discovery, cytotoxicity, drug, antiviral activity, RNA, Replication, Health, Antiviral agents, Research, RdRP, RNA-dependent RNA polymerase, morbidity and mortality, Viral RNA, university, Coronavirus-2, acute respiratory syndrome, Abstract, infection process, late stage, extension, derivative, Effect, Antiviral compound, effective, anti-coronavirus activity, resulting, examined, virus, inhibited, exhibited, coronavirus, demonstrated, catalyzed, dengue virus, the SARS-CoV-2, 【제목키워드】 SARS-CoV-2, Coronaviruses, antiviral activity, exhibit,