Narnaviridae

Narnaviridae
Virus classification
Group:	Group IV ((+)ssRNA)
Family:	Narnaviridae
Genera
Narnavirus Mitovirus

The Narnaviridae are a family of positive single stranded RNA viruses. Uniquely among viruses they lack a protein coat.

Virology

The genome 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.^[1]

They infect fungi and oomycetes.^[2] These viruses are commonly found infecting yeast.

Taxonomy

Two genera have been recognised to date. The Mitoviruses infect the mitochondria of fungi while the Narnaviruses remain within the cytoplasm of the host.

• Genus Narnavirus; type species: Saccharomyces cerevisiae 20SRNA narnavirus
• Genus Mitovirus; type species: Cryphonectria parasitica mitovirus-1 NB631

(Note that although the Narnaviridae are now treated with other (+)ssRNA viruses, they were previously given their own group).

References

1. ^ 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):26428-26435
2. ^ 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

External links

• Viralzone: Narnaviridae