Ourmiavirus (taxid:186783)

VIRION

Non-enveloped capsids with T=1 icosahedral symmetry. Capsids are often bacilliform with a diameter of 18nm, and length varies from 30nm to 62 nm depending on the number of supplemental capsid discs.

GENOME

Segmented, linear, ssRNA(+) genome. The three segments are 0.9kb, 1.0kb and 2.8kb in size respectively.

GENE EXPRESSION

Genomic RNAs serve as messenger RNAs.

ENZYMES

• RNA-directed RNA polymerase [RdRp]

REPLICATION

CYTOPLASMIC

1. Virus penetrates into the host cell.
2. Uncoating, and release of the viral genomic RNA into the cytoplasm.
3. The viral RNAs are translated to produce the three viral proteins.
4. Replication takes place in cytoplasmic viral factories. A dsRNA genome is synthesized from the genomic ssRNA(+).
5. The dsRNA genome is transcribed/replicated thereby providing viral mRNAs/new ssRNA(+) genomes.
6. Virus assembly, each segment is encapsidated possibly individually.
7. Viral movement protein probably mediates virion cell-to-cell transfer.