Biology:Narnavirus
Narnavirus is a genus of positive-strand RNA viruses in the family Narnaviridae. Fungi serve as natural hosts. There are two species in this genus.[1][2] Member viruses have been shown to be required for sexual reproduction of Rhizopus microsporus ("Narnaviruses decrease asexual reproduction, but together with Mycetohabitans, are required for sexual reproductive success. This fungal–bacterial-viral system represents an outstanding model to investigate three-way microbial symbioses and their evolution.").[3] Narnaviruses have a naked RNA genome without a virion and derive their name from this feature.[4]
Virology
Structure
Narnaviruses have no true virion. They do not have structural proteins or a capsid.[5]
Genome
Narnaviruses have nonsegmented, linear, positive-sense, single-stranded RNA genomes. The genome has one open reading frame which encodes the RNA-dependent RNA polymerase (RdRp). The genome is associated with the RdRp in the cytoplasm of the fungi host and forms a naked ribonucleoprotein complex.[2]
Replication cycle
Viral replication is cytoplasmic. Replication follows the positive-strand RNA virus replication model. Positive-strand RNA virus transcription is the method of transcription. The virus exits the host cell by cell-to-cell movement. Fungi serve as the natural host. Transmission routes are parental and sexual.[2]
Taxonomy
The genus has the following species, listed by scientific name and followed by the exemplar virus of the species:[1][6]
- Narnavirus saccharomaior, Saccharomyces 23S RNA narnavirus
- Narnavirus saccharominor, Saccharomyces 20S RNA narnavirus
References
- ↑ 1.0 1.1 "Virus Taxonomy: 2024 Release". International Committee on Taxonomy of Viruses. https://ictv.global/taxonomy.
- ↑ 2.0 2.1 2.2 "Viral Zone". ExPASy. http://viralzone.expasy.org/all_by_species/303.html.
- ↑ Espino-Vázquez AN; Bermúdez-Barrientos JR; Cabrera-Rangel JF; Córdova-López G; Cardoso-Martínez F; Martínez-Vázquez A; Camarena-Pozos DA; Mondo SJ et al. (2020). "Narnaviruses: Novel players in fungal–bacterial symbioses". The ISME Journal 14 (7): 1743–1754. doi:10.1038/s41396-020-0638-y. PMID 32269378.
- ↑ "Narnaviridae - Positive Sense RNA Viruses - Positive Sense RNA Viruses (2011) - ICTV". https://talk.ictvonline.org/ictv-reports/ictv_9th_report/positive-sense-rna-viruses-2011/w/posrna_viruses/267/narnaviridae.
- ↑ Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 978-0-470-01617-6.
- ↑ "Rename all species in the family to comply with the ICTV-mandated binomial format (Wolframvirales: Narnaviridae)" (docx). International Committee on Taxonomy of Viruses. April 2023. https://ictv.global/ictv/proposals/2023.003F.Narnaviridae_spren.zip.
External links
Wikidata ☰ Q18819842 entry
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