Download MendeleyCapsid structure of a fungal dsRNA megabirnavirus reveals its previously unidentified surface architecture.
Wang, H., Salaipeth, L., Miyazaki, N., Suzuki, N., Okamoto, K.(2023) PLoS Pathog 19: e1011162-e1011162
- PubMed: 36848381
- DOI: https://doi.org/10.1371/journal.ppat.1011162
- Primary Citation of Related Structures:
8B4Z, 8B59 - PubMed Abstract:
Rosellinia necatrix megabirnavirus 1-W779 (RnMBV1) is a non-enveloped icosahedral double-stranded (ds)RNA virus that infects the ascomycete fungus Rosellinia necatrix, a causative agent that induces a lethal plant disease white root rot. Herein, we have first resolved the atomic structure of the RnMBV1 capsid at 3.2 Å resolution using cryo-electron microscopy (cryo-EM) single-particle analysis. Compared with other non-enveloped icosahedral dsRNA viruses, the RnMBV1 capsid protein structure exhibits an extra-long C-terminal arm and a surface protrusion domain. In addition, the previously unrecognized crown proteins are identified in a symmetry-expanded cryo-EM model and are present over the 3-fold axes. These exclusive structural features of the RnMBV1 capsid could have been acquired for playing essential roles in transmission and/or particle assembly of the megabirnaviruses. Our findings, therefore, will reinforce the understanding of how the structural and molecular machineries of the megabirnaviruses influence the virulence of the disease-related ascomycete fungus.
Organizational Affiliation:
The Laboratory of Molecular Biophysics, Department of Cell and Molecular Biology, Uppsala University, Uppsala, Sweden.
