Biology:Narnavirus

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Short description: Genus of viruses


Narnavirus
Narnaviridae virion.jpg
Viruses-11-00233-g006b-top.png
Narnaviruses have no capsid or viral envelope, RNA genome and RdRp form a naked ribonucleoprotein complex
Virus classification e
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Lenarviricota
Class: Amabiliviricetes
Order: Wolframvirales
Family: Narnaviridae
Genus: Narnavirus
Species
See text

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.[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 two species:[1]

  • Saccharomyces 20S RNA narnavirus
  • Saccharomyces 23S RNA narnavirus

References

  1. 1.0 1.1 "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. https://ictv.global/taxonomy. 
  2. 2.0 2.1 2.2 "Viral Zone". ExPASy. http://viralzone.expasy.org/all_by_species/303.html. 
  3. 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. 
  4. "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. [|permanent dead link|dead link}}]
  5. Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 978-0-470-01617-6. 

External links

Wikidata ☰ Q18819842 entry