View source for Biology:P2likevirus

{{taxobox
| virus_group  = i
| ordo         = ''[[Biology:Caudovirales|Caudovirales]]''
| familia      = ''[[Biology:Myoviridae|Myoviridae]]''
| subfamilia   = ''[[Biology:Peduovirinae|Peduovirinae]]''
| genus        = '''''P2likevirus'''''
| type_species = ''Enterobacteria phage P2''
}}

'''''P2likevirus''''' (synonyms ''P2-like phages'' and ''P2-like viruses'') is a genus of [[Biology:Virus|virus]]es in the order [[Biology:Caudovirales|Caudovirales]], in the family [[Biology:Myoviridae|Myoviridae]], in the subfamily [[Biology:Peduovirinae|Peduovirinae]]. Bacteria serve as natural hosts, with transmission achieved through passive diffusion. There are currently 13 species in this genus, including the type species Enterobacteria phage P2.<ref name=ViralZone>{{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/506.html|publisher=ExPASy|accessdate=1 July 2015}}</ref><ref name=ICTV>{{cite web|last1=ICTV|title=Virus Taxonomy: 2014 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=1 July 2015}}</ref><ref name=NCBI />

==Taxonomy==
<big>'''Group: dsDNA'''</big>
{{Collapsible list|title= <big>Order: [[Biology:Caudovirales|Caudovirales]]</big>
|1={{Collapsible list| framestyle=border:none; padding:1.0em;|title=Family: [[Biology:Myoviridae|Myoviridae]]
|1={{Collapsible list| framestyle=border:none; padding:1.0em;|title=Sub-Family: [[Biology:Peduovirinae|Peduovirinae]]
|1={{hidden begin|title=<small>Genus: P2likevirus</small>}}
*<small>[[Biology:Burkholderia phage phi52237|Burkholderia phage phi52237]]</small>
*<small>[[Biology:Burkholderia phage phiE202|Burkholderia phage phiE202]]</small>
*<small>[[Biology:Burkholderia phage phiE12-2|Burkholderia phage phiE12-2]]</small>
*<small>[[Biology:Enterobacteria phage 186|Enterobacteria phage 186]]</small>
*<small>'''''Enterobacteria phage P2'''''</small>
*<small>[[Biology:Enterobacteria phage PsP3|Enterobacteria phage PsP3]]</small>
*<small>[[Biology:Enterobacteria phage Wphi|Enterobacteria phage Wphi]]</small>
*<small>[[Biology:Mannheimia phage phiMhaA1-PHL101|Mannheimia phage phiMhaA1-PHL101]]</small>
*<small>[[Biology:Pseudomonas phage phiCTX|Pseudomonas phage phiCTX]]</small>
*<small>[[Biology:Ralstonia phage RSA1|Ralstonia phage RSA1]]</small>
*<small>[[Biology:Salmonella Fels-2|Salmonella Fels-2]]</small>
*<small>[[Biology:Salmonella SopEphi|Salmonella SopEphi]]</small>
*<small>[[Biology:Yersinia phage L-413C|Yersinia phage L-413C]]</small>
{{hidden end}}
}}
}}
}}
<ref name=ICTV />

==Structure==
P2likeviruses are [[Biology:Viral envelope|nonenveloped]], with a head and tail. The icosahedral head is approximately 60&nbsp;nm in diameter and a [[Chirality|dextral]] symmetry (T=7), composed of 72 capsomers. The tail is around 135&nbsp;nm long, 18&nbsp;nm wide, has 6 short, kinked tail fibers. The tail is enclosed in a sheath, which loosens and slides around the tail core upon contraction.<ref name=ViralZone />
{| class="wikitable sortable" style="text-align:center"
|-
! Genus !! Structure || Symmetry !! Capsid !! Genomic arrangement !! Genomic segmentation
|-
|P2likevirus||Head-Tail||T=7 dextro||Non-enveloped||Linear||Monopartite
|}

==Genome==
Nine of the thirteen viruses' genomes have been fully sequenced and are available on NCBI's website (though Salmonella phage Fels-2 is currently listed as unclassified). They range between 30k and 39k nucleotides, with 40 to 51 proteins. All eight complete genomes, as well as several additional "unclassified" virus genomes, are available at [https://www.ncbi.nlm.nih.gov/genomes/GenomesGroup.cgi?opt=phage&taxid=140410]<ref name=NCBI>{{cite web|last1=NCBI|title=P2linkevirus Complete Genomes|url=https://www.ncbi.nlm.nih.gov/genomes/GenomesGroup.cgi?opt=phage&taxid=140410|accessdate=13 February 2015}}</ref>

==Life cycle==
Viral replication is cytoplasmic. The virus attaches to the host cell using its tail 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 and holin/endolysin/spanin proteins.<ref name=ViralZone />
{| class="wikitable sortable" style="text-align:center"
|-
! Genus !! Host details !! Tissue tropism !! Entry details !! Release details !! Replication site !! Assembly site !! Transmission
|-
|P2likevirus||Bacteria||None||Injection||Lysis||Cytoplasm||Cytoplasm||Passive diffusion
|}

==History==
According to [[Organization:International Committee on Taxonomy of Viruses|ICTV]]'s 1996 report, the genus '''''P2likevirus''''' was first accepted under the name ''P2-like phages'' in the family ''[[Biology:Myoviridae|Myoviridae]]'', unassigned to a sub-family. The genus name was changed to ''P2-like viruses'' in the ICTV 7th Report in 1999. It was moved into the subfamily ''[[Biology:Peduovirinae|Peduovirinae]]'' upon its inception in 2010-11. The following year (2012), the genus was renamed to ''P2likevirus''. These reports are available through ICTV here: [http://ictvonline.org/proposals/Ratification_1996.pdf 1996], [http://ictvonline.org/proposals/ICTV%207th%20Report.pdf 1999], [http://ictvonline.org/proposals/2009.012a-qB.A.v3.Peduovirinae.pdf 2010], [http://ictvonline.org/proposals/2011.010aB.A.v2.Caudovirales_genus-ren.pdf 2012].
<ref name=ICTV />

==References==
{{Reflist}}

==External links==
* [http://viralzone.expasy.org/all_by_species/506.html '''Viralzone''': P2likevirus]
* [http://ictvonline.org/virusTaxonomy.asp '''ICTV''']

{{Baltimore classification}}
{{Taxonbar|from=Q12231593}}

[[Category:Caudovirales]]
[[Category:Myoviridae]]
[[Category:Peduovirinae]]

{{Sourceattribution|P2likevirus|1}}