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TitleThe infectious particle of insect-borne totivirus-like Omono River virus has raised ridges and lacks fibre complexes.
Journal, issue, pagesSci Rep, Vol. 6, Page 33170, Year 2016
Publish dateSep 12, 2016
AuthorsKenta Okamoto / Naoyuki Miyazaki / Daniel S D Larsson / Daisuke Kobayashi / Martin Svenda / Kerstin Mühlig / Filipe R N C Maia / Laura H Gunn / Haruhiko Isawa / Mutsuo Kobayashi / Kyoko Sawabe / Kazuyoshi Murata / Janos Hajdu /
PubMed AbstractOmono River virus (OmRV) is a double-stranded RNA virus isolated from Culex mosquitos, and it belongs to a group of unassigned insect viruses that appear to be related to Totiviridae. This paper ...Omono River virus (OmRV) is a double-stranded RNA virus isolated from Culex mosquitos, and it belongs to a group of unassigned insect viruses that appear to be related to Totiviridae. This paper describes electron cryo-microscopy (cryoEM) structures for the intact OmRV virion to 8.9 Å resolution and the structure of the empty virus-like-particle, that lacks RNA, to 8.3 Å resolution. The icosahedral capsid contains 120-subunits and resembles another closely related arthropod-borne totivirus-like virus, the infectious myonecrosis virus (IMNV) from shrimps. Both viruses have an elevated plateau around their icosahedral 5-fold axes, surrounded by a deep canyon. Sequence and structural analysis suggests that this plateau region is mainly composed of the extended C-terminal region of the capsid proteins. In contrast to IMNV, the infectious form of OmRV lacks extensive fibre complexes at its 5-fold axes as directly confirmed by a contrast-enhancement technique, using Zernike phase-contrast cryo-EM. Instead, these fibre complexes are replaced by a short "plug" structure at the five-fold axes of OmRV. OmRV and IMNV have acquired an extracellular phase, and the structures at the five-fold axes may be significant in adaptation to cell-to-cell transmission in metazoan hosts.
External linksSci Rep / PubMed:27616740 / PubMed Central
MethodsEM (single particle)
Resolution8.3 - 8.9 Å
Structure data

EMDB-3350:
Electron cryo-microscopy of an dsRNA-empty totivirus-like Omono River virus (OmRV)
Method: EM (single particle) / Resolution: 8.3 Å

EMDB-3351:
Electron cryo-microscopy of an dsRNA-full Omono River virus (OmRV)
Method: EM (single particle) / Resolution: 8.9 Å

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