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TitleCapsid structure of a fungal dsRNA megabirnavirus reveals its previously unidentified surface architecture.
Journal, issue, pagesPLoS Pathog, Vol. 19, Issue 2, Page e1011162, Year 2023
Publish dateFeb 27, 2023
AuthorsHan Wang / Lakha Salaipeth / Naoyuki Miyazaki / Nobuhiro Suzuki / Kenta Okamoto /
PubMed AbstractRosellinia 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 ...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.
External linksPLoS Pathog / PubMed:36848381 / PubMed Central
MethodsEM (single particle)
Resolution3.2 - 3.3 Å
Structure data

15855

8b4z

EMDB-15855, PDB-8b4z:
Rosellinia necatrix megabirnavirus 1-W779 full capsid
Method: EM (single particle) / Resolution: 3.2 Å

EMDB-15857: Rosellinia necatrix megabirnavirus 1-W779 empty capsid
Method: EM (single particle) / Resolution: 3.2 Å

15859

8b59

EMDB-15859: Rosellinia necatrix megabirnavirus 1-W779 full capsid with Crown protein
PDB-8b59: Rosellinia necatrix megabirnavirus 1-W779 Crown protein
Method: EM (single particle) / Resolution: 3.3 Å

Source
  • rosellinia necatrix megabirnavirus 1/w779
KeywordsVIRUS / viruses / dsRNA / capsid / cryo-EM / fungus / Megabirnaviridae / mycoviruses

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