VIRION
No true virion, no structural proteins. Genomes are associated with their RdRp in the cytoplasm with the exception of Ourmiavirus having a non-enveloped capsids with T=1 icosahedral symmetry.
GENOME
Monopartite or segmented (3), linear, ssRNA(+) genome. Each segments are 1 to 3 kb in size.
GENE EXPRESSION
Genomic RNAs serve as messenger RNAs.
ENZYMES
REPLICATION
CYTOPLASMIC
- Virus penetrates into the host cell.
- Uncoating, and release of the viral genomic RNA into the cytoplasm.
- The viral RNAs are translated to produce the three viral proteins.
- Replication takes place in cytoplasmic viral factories. A dsRNA genome is synthesized from the genomic ssRNA(+).
- The dsRNA genome is transcribed/replicated thereby providing viral mRNAs/new ssRNA(+) genomes.
- Virus assembly, each segment is encapsidated possibly individually.
- Viral movement protein probably mediates virion cell-to-cell transfer.