Tymoviridae

Tymoviridae
Virus classification
Group:	Group IV ((+)ssRNA)
Order:	Tymovirales
Family:	Tymoviridae
Genera
Maculavirus Marafivirus Tymovirus

Tymoviridae are monopartite single-stranded positive sense RNA plant viruses, belonging to group IV of the Baltimore classification of viruses. The Tymoviridae are a relatively new family, only approved in 2002.

Virology

The virons are non-enveloped and isometric with a diameter of around 30 nm, with an icosahedral structure and a triangulation number (T) = 3.

The linear genome is between of 6-7.5 kilobases in length and encodes one large open reading frame. It is capped at the 5’ terminus. The 3’ terminus may have a tRNA-like structure or a polyA tract, depending upon the species. The genome is relatively cytosine rich.

Taxonomy

The largest of three genera is Tymovirus with 25 species, whereas the other genera, Marafivirus and Maculavirus have 5 and 1 species respectively.

The Tymoviridae family includes the following genera:

• Genus Maculavirus
  • Bombyx mori Macula-like virus
  • Grapevine fleck virus (type species)

• Genus Marafivirus
  • Maize rayado fino virus (type species)

• Genus Tymovirus
  • Asclepias asymptomatic virus
  • Turnip yellow mosaic virus (type species)

Unclassified viruses

• Fig fleck-associated virus
• Olive latent virus 3

References

• Martelli GP. Sabanadzovic S. Abou-Ghanem Sabanadzovic N. Edwards MC. Dreher T. (2002). The family Tymoviridae. Archives of Virology. 147(9):1837-46
• University of Leicester Microbiology
• ICTV Virus Taxonomy 2009 [1]
• UniProt Taxonomy [2]

External links

• Viralzone: Tymoviridae