Bullavirinae

Bullavirinae is a subfamily of viruses in the family Microviridae. Enterobacteria serve as natural hosts. There are currently 14 species in this subfamily, organized into three genera.[1]

Bullavirinae
Virus classification
(unranked): Virus
Realm: Monodnaviria
Kingdom: Sangervirae
Phylum: Phixviricota
Class: Malgrandaviricetes
Order: Petitvirales
Family: Microviridae
Subfamily: Bullavirinae
Genera
  • Alphatrevirus
  • Gequatrovirus
  • Sinsheimervirus

Taxonomy

The following genera and species are recognized:[1]

  • Genus: Alphatrevirus; species:
    • Escherichia virus alpha3, the type species
    • Escherichia virus ID21
    • Escherichia virus ID32
    • Escherichia virus ID62
    • Escherichia virus NC28
    • Escherichia virus NC29
    • Escherichia virus NC35
    • Escherichia virus phiK
    • Escherichia virus St1
    • Escherichia virus WA45
  • Genus: Gequatrovirus; species:
  • Genus: Sinsheimervirus; species:

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, around 6.1kb in length.[2]

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.[2]

References
  1. "Virus Taxonomy: 2019 Release". talk.ictvonline.org. International Committee on Taxonomy of Viruses. Retrieved 29 April 2020.
  2. "Viral Zone". ExPASy. Retrieved 15 June 2015.
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