Nepovirus

Nepovirus
Virus classification
Group:	Group IV ((+)ssRNA)
Order:	Picornavirales
Family:	Secoviridae
Subfamily:	Comovirinae
Genus:	Nepovirus
Type species
Tobacco ringspot virus
Species
Apricot latent ringspot virus Arabis mosaic virus Arracacha virus A Artichoke Aegean ringspot virus Artichoke Italian latent virus Artichoke yellow ringspot virus Beet ringspot virus Blackcurrant reversion virus Blueberry leaf mottle virus Cassava American latent virus Cassava green mottle virus Cherry leaf roll virus Chicory yellow mottle virus Cocoa necrosis virus Crimson clover latent virus Cycas necrotic stunt virus Grapevine Anatolian ringspot virus Grapevine Bulgarian latent virus Grapevine chrome mosaic virus Grapevine deformation virus Grapevine fanleaf virus Grapevine Tunisian ringspot virus Hibiscus latent ringspot virus Lucerne Australian latent virus Mulberry ringspot virus Myrobalan latent ringspot virus Olive latent ringspot virus Peach rosette mosaic virus Potato black ringspot virus Potato virus U Raspberry ringspot virus Tobacco ringspot virus Tomato black ring virus Tomato ringspot virus

Nepoviruses or nematode transmitted polyhedral viruses, are a genus of plant viruses of the family Secoviridae and subfamily Comovirinae. Nepoviruses, unlike the other two genera (comovirus and fabavirus) in the subfamily Comovirinae, are transmitted by nematodes.

Genome

Nepoviruses are classified as type IV viruses under the Baltimore classification system, and consequently contain bipartite, linear, single stranded positive sense RNA genomes. The two genome segments are encapsulated separately into two different icosahedral particles. Each of the genome segments produces a different polypeptide, which under goes a series of steps (i.e. proteolysis, and other post-translational modifications) in order to produce a functional protein.

RNA1

The first segment (RNA1) is approximately 8,000 nucleotides in length and appears as a single copy in each B type virion. It encodes the proteins that are important in replication and is the first gene to be activated.

RNA2

The second segment (RNA2) is approximately 4,000–7,000 nucleotides in length and usually appears as a single copy in each M type virion. It encodes the proteins that are important in cell-cell transmission and evasion of cellular defenses.

Species

There are many members of the genus Nepovirus including the species:

• Cherry leaf roll virus
• Grapevine fanleaf virus
• Raspberry ringspot virus
• Tobacco ringspot virus

References

• "Notes on Genus: Nepovirus". http://www.dpvweb.net/notes/showgenus.php?genus=Nepovirus. Retrieved 2007-08-06. 

External links

• Viralzone: Nepovirus

• ICTV Virus Taxonomy 2009 [1]
• UniProt Taxonomy [2]