Qubevirus

Qubevirus
TEM of Bacteriophage Qβ attached to the pilus of E. coli and its genome
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Orthornavirae
Phylum: Lenarviricota
Class: Leviviricetes
Order: Norzivirales
Family: Fiersviridae
Genus: Qubevirus

Qubevirus is a genus of positive-strand RNA viruses, in the family Fiersviridae. Enterobacteria serve as natural hosts.[1] There are two species in this genus.[2] In 2020, the genus was renamed from Allolevivirus to its current name.[3]

Structure

Viruses in Qubevirus are non-enveloped, with icosahedral and spherical geometries, and T=3 symmetry. The diameter is around 26 nm.[1]

Genome

Qubeviruses have a positive-sense, single-stranded RNA genome. The genome is linear and non-segmented and around 4kb in length. The genome codes for four proteins, which are the coat, replicase, maturation, and lysis protein.[1]

Life cycle

Entry into the host cell is achieved by adsorption into the host cell. Replication follows the positive-strand RNA virus replication model. Positive-strand RNA virus transcription is the method of transcription. Translation takes place by suppression of termination. The virus exits the host cell by bacteria lysis. Enterobacteria serve as the natural host.[1]

Taxonomy

The genus Qubevirus has the following two species:[2]

  • Qubevirus durum, commonly called bacteriophage Qbeta
  • Qubevirus faecium

References

  1. 1 2 3 4 "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. 1 2 "Virus Taxonomy: 2020 Release". International Committee on Taxonomy of Viruses (ICTV). March 2021. Retrieved 16 May 2021.
  3. ↑ "ICTV Taxonomy history: Qubevirus". International Committee on Taxonomy of Viruses (ICTV). Retrieved 16 May 2021.
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