| Narnavirus | |
|---|---|
) | |
){kind=small} | |
| Narnaviruses have no capsid or viral envelope, RNA genome and RdRp form a naked ribonucleoprotein complex | |
Virus classification  | |
| (unranked): | Virus |
| Realm: | Riboviria |
| Kingdom: | Orthornavirae |
| Phylum: | Lenarviricota |
| Class: | Amabiliviricetes |
| Order: | Wolframvirales |
| Family: | Narnaviridae |
| Genus: | Narnavirus |
| Type species | |
| Saccharomyces 20S RNA narnavirus[1] | |
| Species | |
| |
Narnavirus is a genus of positive-strand RNA viruses, in the family Narnaviridae. Fungi serve as natural hosts. There are currently two species in this genus including the type species Saccharomyces 20S RNA narnavirus.[1][2] Narnaviruses have been shown to be required for sexual reproduction of Rhizopus microsporus.[3]
Structure
Narnaviruses have no true virion. They do not have structural proteins or a capsid.[4]
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]
Life 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 two species:
- Narnaviridae
- Narnavirus
- Saccharomyces 20S RNA narnavirus
- Saccharomyces 23S RNA narnavirus
- Narnavirus
References
- ^ a b ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
- ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015.
- ^ Espino-Vázquez AN, Bermúdez-Barrientos JR, Cabrera-Rangel JF, Córdova-López G, Cardoso-Martínez F, Martínez-Vázquez A, Camarena-Pozos DA, Mondo SJ, Pawlowska TE, Abreu-Goodger C, Partida-Martínez LP. (2020). "Narnaviruses: Novel players in fungal–bacterial symbioses". The ISME Journal. doi:10.1038/s41396-020-0638-y.
- ^ Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 978-0470016176.