Notes on Genus: Avenavirus


Type member: Oat chlorotic stunt virus


General Description

The genus Avenavirus is one of 11 genera in the family Tombusviridae. The name is based on Avena, the scientific name of oat (the host of the type member). All the genera are morphologically similar, with icosahedral particles and small, (usually) monopartite ss RNA genomes. The single member of this genus has the largest coat protein of any member of the family (48.2 kDa) and four (rather than the usual five or six) open reading frames. The coat protein region shows most similarity with members of the genus Tombusvirus whilst the size and predicted strategy of the genome seem to be intermediate between that of the Carmovirus and Tombusvirus genera.


Virions isometric (icosahedral), not enveloped, 35 nm in diameter.


Monopartite, linear, single stranded, positive sense RNA approx. 4.4 kb in size. The 3' terminus has no poly(A) tract.

Genus Genomic Organization

The RNA is translated into three or four putative products.

Type Member Genomic Organization

The RNA is translated into three or perhaps four products:
1. 23 kDaputative polymerase
2. 84 kDapolymerase, produced by readthrough of 1
3. 48 kDacoat protein
4. 8 kDapossible ORF of unknown function