Notes on Genus: Okavirus

enveloped bacilliform

Type member: Gill-associated virus

Contents

Members of this Genus
General Description
Morphology
Electron Micrograph
Genome
Genus Genomic Organization
Genome Map
Type Member Genomic Organization
Curated Sequences

General Description

This is currently the only genus in the family Roniviridae (rod-shaped nidoviruses) and is named after the crustacean lymphoid organ (oka) in which the viruses are commonly found.

Morphology

Virions enveloped and bacilliform, 150-200 nm x 40-60 nm.

Genome

Monopartite positive sense single-stranded RNA of size about 26kb and with a 3'-polyA tail.

Genus Genomic Organization

Two large, overlapping ORFs at the 5'-end of the genome encode the major non-structural proteins and are expressed as a fusion protein by ribosomal frameshift. Downstream are about 4 other genes, encoding structural proteins, and these are expressed from a 3'-coterminal nested set of subgenomic RNAs.

Type Member Genomic Organization

The RNA of 26.2kb is translated into the following products: