Narnaviridae
| Narnaviridae | |
|---|---|
| Virus classification | |
| Group: | Group IV ((+)ssRNA) |
| Order: | Unassigned |
| Family: | Narnaviridae |
| Genera | |
| |
Narnaviridae is a family of positive single stranded RNA viruses. Members of this family have no capsid.[1]
Virology
The genome of these viruses is unipartate and between 2.3 and 3.5 kilobases in length. It encodes a single gene—the RNA dependent RNA polymerase. This protein is associated with the genome in the cytoplasm of the host.[2] The viruses do not have a capsid or envelop and do not form any infectious viral particles except lipid vesicles.[3]
They infect fungi (including yeast) and oomycetes.[4] Mitovirues appear to be among the most common fungi viruses.[3]
Taxonomy
Two genera have been recognised to date. Mitoviruses infect the mitochondria of fungi while narnaviruses remain within the cytoplasm of the host cell.[3]
- Genus Narnavirus; type species: Saccharomyces cerevisiae 20SRNA narnavirus
- Genus Mitovirus; type species: Cryphonectria parasitica mitovirus-1 NB631
Other members of the Mitovirus are OnuMV1c and OnuMV7.
Their closest relatives among RNA viruses are plant-infecting viruses of genus Ourmiavirus, which, however, have a capsid and a number of other proteins. Other close relatives are bacteriophages of the family Leviviridae.[3]
References
- ↑ Dolja, V. V.; Koonin, E. V. (2012). "Capsid-Less RNA Viruses". ELS. doi:10.1002/9780470015902.a0023269. ISBN 0470016175.
- ↑ Solorzano A, Rodríguez-Cousiño N, Esteban R, Fujimura T (2000) Persistent yeast single-stranded RNA viruses exist in vivo as genomic RNA. RNA polymerase complexes in 1:1 stoichiometry. J Biol Chem 275(34):26428–35
- ↑ 3.0 3.1 3.2 3.3 Hillman, B. I.; Cai, G. (2013). "The Family Narnaviridae". Mycoviruses. Advances in Virus Research 86. p. 149. doi:10.1016/B978-0-12-394315-6.00006-4. ISBN 9780123943156.
- ↑ Cai G, Myers K, Fry WE, Hillman BI (2011) A member of the virus family Narnaviridae from the plant pathogenic oomycete Phytophthora infestans. Arch Virol