Download MendeleyThe structure of the mammalian bornavirus polymerase complex.
Carrique, L., Gunl, F., Deng, A., Grimes, J.M., Keown, J.R.(2025) Nat Commun 16: 7508-7508
- PubMed: 40804239
- DOI: https://doi.org/10.1038/s41467-025-62906-4
- Primary Citation of Related Structures:
9H1G, 9H1Q, 9H1Y - PubMed Abstract:
Borna disease virus 1 (BoDV-1) is a non-segmented RNA virus with one of the smallest known RNA virus genomes. BoDV-1 replicates in the nucleus of infected cells using a virally encoded polymerase complex composed of the large protein and phosphoprotein. Here, we present the BoDV-1 polymerase complex at resolutions up to 2.8 Å, describing the fully ordered large polymerase protein bound to tetrameric phosphoprotein. The complex is maintained through the ordered C-terminal region of one copy of the phosphoprotein. Analysis of the model reveals a conserved methyltransferase domain, though key S-adenosyl methionine binding residues are missing. While no RNA is observed in our models, analysis of a sample under reaction conditions induces an opening and closing of the template entry and exit channels, respectively. Higher-order polymerase assemblies suggest oligomerisation as a conserved feature of negative strand RNA virus polymerases. We provide a molecular framework to investigate bornavirus replication and transcription.
- Division of Structural Biology, Centre for Human Genetics, University of Oxford, Oxford, UK.
Organizational Affiliation:
