First High-Resolution Structure of BoDV-1 Mapped
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- Kyoto University, Osaka Dental University, and Osaka Metropolitan University researchers used cryo-electron microscopy to generate the first detailed 3D structure of the BoDV-1 nucleoprotein-RNA complex, published in Science Advances (2026)
- BoDV-1 is an extremely rare zoonotic virus that almost always causes fatal encephalitis in humans and belongs to the order Mononegavirales, alongside Ebola, measles, and rabies
- First author Yukihiko Sugita described bornaviruses as "the last major unresolved case" for nucleoprotein-RNA structural analysis among human-infecting mononegaviruses
- The structural analysis revealed ring-like nucleoprotein assemblies with viral RNA bound in an inner groove, and showed that each nucleoprotein subunit accommodates 8 RNA nucleotides in a binding mode distinct from other related viruses
- Mutational and functional assays demonstrated that RNA-binding mutations disrupt viral RNA synthesis, yet nucleoprotein assemblies can form even without RNA, supporting an incremental model in which assembly and RNA engagement are separate but coordinated
- The study provides a molecular framework for systematic comparison of Bornaviridae architecture with other mononegaviruses and lays groundwork for future antivirals targeting nucleoprotein-RNA interactions
Why it matters: The work delivers the first molecular map of the BoDV-1 nucleoprotein-RNA complex, giving antiviral researchers a concrete structural target in a virus family where none existed. Because nearly every human BoDV-1 infection ends in fatal brain inflammation, even a foundational structural blueprint is a step toward drugs that could one day disrupt viral replication at the RNA-nucleoprotein interface.
