Bullavirinae

Bullavirinae is a subfamily of viruses in the family Microviridae. Enterobacteria serve as natural hosts. There are 14 species in this subfamily, organized into three genera.

Taxonomy

The following genera and species are recognized:

Genus: Alphatrevirus; species:
* Alphatrevirus alpha3
* Alphatrevirus ID21
* Alphatrevirus ID32
* Alphatrevirus ID62
* Alphatrevirus NC28
* Alphatrevirus NC29
* Alphatrevirus NC35
* Alphatrevirus phiK
* Alphatrevirus St1
* Alphatrevirus WA45
Genus: Gequatrovirus; species:
* Gequatrovirus G4
* Gequatrovirus ID52
* Gequatrovirus talmos
Genus: Sinsheimervirus; species:
* ''Sinsheimervirus phiX174''

Structure

Viruses in Bullavirinae are non-enveloped, with icosahedral and round geometries, and T=1 symmetry. The diameter is around 30 nm. Genomes are circular, 4.4 to 6.1kb in length.

Life cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by pilus-mediated adsorption into the host cell. Replication follows the ssDNA rolling circle model. DNA-templated transcription is the method of transcription. The virus exits the host cell by bacteria lysis.
Enterobacteria serve as the natural host. Transmission routes are passive diffusion.