Pbunavirus

Pbunavirus (synonyms: Pb1likevirus, Pbunalikevirus) is a genus of viruses in the order Caudovirales, in the family Myoviridae. Bacteria serve as natural hosts. There are currently seven species in this genus, including the type species Pseudomonas phage PB1.[1][2][3]

Pbunavirus
Virus classification
(unranked): Virus
Realm: Duplodnaviria
Kingdom: Heunggongvirae
Phylum: Uroviricota
Class: Caudoviricetes
Order: Caudovirales
Family: Myoviridae
Genus: Pbunavirus
Type species
Pseudomonas virus PB1

Taxonomy

The following species are recognized:[2]

  • Burkholderia virus BcepF1
  • Pseudomonas virus 141
  • Pseudomonas virus Ab28
  • Pseudomonas virus CEBDP1
  • Pseudomonas virus DL60
  • Pseudomonas virus DL68
  • Pseudomonas virus E215
  • Pseudomonas virus E217
  • Pseudomonas virus F8
  • Pseudomonas virus JG024
  • Pseudomonas virus KPP12
  • Pseudomonas virus KTN6
  • Pseudomonas virus LBL3
  • Pseudomonas virus LMA2
  • Pseudomonas virus NH4
  • Pseudomonas virus PA5
  • Pseudomonas virus PB1
  • Pseudomonas virus PS44
  • Pseudomonas virus SN

Structure

Pbunaviruses are nonenveloped, with a head and tail. The head has a diameter of about 75  nm. The tail is around 140 nm long displaying a criss-cross pattern, has a small baseplate, and is contractile.[1]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
PbunavirusHead-TailNon-envelopedLinearMonopartite

Genome

Genomes are linear, around 65-75kb in length. The genome codes for 90 to 130 proteins.[1] All seven species have been fully sequenced and are available from ICTV. They range between 64k and 73k nucleotides, with 88 to 127 proteins. The complete genomes are available from here.[3]

Life cycle

Viral replication is cytoplasmic. 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. 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 routes are passive diffusion.[1]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
PbunavirusBacteriaNoneInjectionLysisCytoplasmCytoplasmPassive diffusion

History

According to the ICTV's 2010–11 report, the genus Pb1likevirus was first accepted as a new genus, at the same time as all of its contained species. This proposal is available here. The following year (2012), the name was changed to Pbunalikevirus. This proposal is available here.[2] The genus was later renamed to Pbunavirus.

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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. "Pbunalikevirus Complete Genomes". Retrieved 17 February 2015.

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