Notes on Genus: Labyrnavirus


Type member: Aurantiochytrium single-stranded RNA virus 01


General Description

This genus is not currently assigned to a family but is placed within the order Picornavirales. It is named because it contains ssRNA viruses that infect Labyrinthulids (marine fungoid protists).


Virions are isometric (icosahedral) and about 25 nm in diameter.


Monopartite, single-stranded, positive-sense RNA of about 9kb and with a polyA tail at the 3'-end.

Genus Genomic Organization

There are two major polyprotein ORFs encoding the non-structual and structural proteins and a smaller third ORF of unknown function.

Type Member Genomic Organization

  1. Replication polyprotein of 175 kDa
  2. Structural polyprotein of 127 kDa (there are known to be three major structural proteins)
  3. 24 kDa ORF of unknown function, partly overlapping ORF2