Bixzunavirus

Bixzunavirus (synonyms: I3-likeviruses and I3likevirus) is a genus of viruses in the order Caudovirales, in the family Myoviridae. Bacteria serve as natural hosts, with transmission achieved through passive diffusion. There are currently eight species in this genus, including the type species Mycobacterium virus I3.[1][2][3]

Bixzunavirus
Virus classification
(unranked): Virus
Realm: Duplodnaviria
Kingdom: Heunggongvirae
Phylum: Uroviricota
Class: Caudoviricetes
Order: Caudovirales
Family: Myoviridae
Genus: Bixzunavirus
Type species
Mycobacterium virus I3

Taxonomy

The following species are recognized:[2]

  • Mycobacterium virus Alice
  • Mycobacterium virus Bxz1
  • Mycobacterium virus Dandelion
  • Mycobacterium virus HyRo
  • Mycobacterium virus I3
  • Mycobacterium virus Lukilu
  • Mycobacterium virus Nappy
  • Mycobacterium virus Sebata

Structure

Bixzunaviruses are nonenveloped, with a head and tail. The head has a diameter between 75 and 95  nm, with a length of 80 nm. The tail is around 53 nm long.[1]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
BixzunavirusHead-TailNon-envelopedLinearMonopartite

Genome

The sequence for Mycobacterium phage I3 is not available from ICTV. Fifteen similar but unclassified viruses are available, ranging between 153k and 158k nucleotides, with 218 to 241 proteins. The complete genomes are available here.[3]

Life cycle

The virus attaches to the host cell using its terminal fibers, and ejects the viral DNA into the host cytoplasm via contraction of its tail sheath. Viral replication is cytoplasmic. DNA-templated transcription is the method of transcription. Once the viral genes have been replicated, the procapsid is assembled and packed. The tail is then assembled and the mature virions are released via lysis. Bacteria serve as the natural host. Transmission route is passive diffusion.[1]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
BixzunavirusBacteriaNoneInjectionLysisCytoplasmCytoplasmPassive diffusion

History

According to the ICTV's 2009 report, the genus I3-like viruses was first accepted as a new genus, at the same time as its type species.[4] In 2012, the name was changed to I3likevirus.[5][6] The genus was later renamed to Bixzunavirus.

References
  1. "Viral Zone". ExPASy. Retrieved 1 July 2015.
  2. "Virus Taxonomy: 2019 Release". talk.ictvonline.org. International Committee on Taxonomy of Viruses. Retrieved 3 May 2020.
  3. NCBI. "I3likevirus Complete Genomes". Retrieved 17 February 2015.
  4. "Template for Taxonomic Proposal to the ICTV Executive Committee - To create a new Genus in an existing Family" (PDF). ICTV. Retrieved 1 May 2016.
  5. "Taxonomic Proposal" (PDF). ICTV. Archived from the original (PDF) on 11 February 2015. Retrieved 1 May 2016.
  6. "Virus Taxonomy: 2013 Release". ICTV. Retrieved 17 February 2015.

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