| 词条 | Spbetalikevirus | ||||||||||||||||||||||||||||
| 释义 |
| virus_group = i | ordo = Caudovirales | familia = Siphoviridae | subfamilia = Unassigned | genus = Spbetalikevirus | type_species = Bacillus phage SPbeta }}Spbetalikevirus (synonym SPbeta-like viruses) is a genus of viruses in the order Caudovirales, in the family Siphoviridae. Bacteria serve as natural hosts. There is currently only one species in this genus: the type species Bacillus phage SPbeta.[1][2][3] TaxonomyGroup: dsDNA{{Collapsible list|title= Order: Caudovirales|1={{Collapsible list| framestyle=border:none; padding:1.0em;|title=Family: Siphoviridae |1={{hidden begin|title=Genus: Spbetalikevirus}}
}} }}[2] StructureSpbetalikeviruses are nonenveloped, with a head and tail. The head is about 81 nm in diameter. The tail is long, but fairly rigid, at about 355 nm long, 10 nm wide. It has six club-shaped terminal fibers and no collar.[1]
GenomeGenomes are linear, around 134kb in length.[1] The type species, Bacillus phage SPbeta, has been fully sequenced. It has about 134k nucleotides, with 185 proteins. The complete genome is available [https://www.ncbi.nlm.nih.gov/genomes/GenomesGroup.cgi?taxid=680116 here][3] Life cycleViral replication is cytoplasmic. The virus attaches to the host cell's adhesion receptors using its terminal fiber, and degrades the cell wall using viral exolysin enough to eject the viral DNA into the host cytoplasm via long flexible tail ejection system. Replication follows the replicative transposition model. 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]
HistoryAccording to ICTV's ninth report, the genus Spbetalikevirus was first accepted under the name SPbeta-like viruses, assigned to family Siphoviridae, order Caudovirales. The genus was renamed to Spbetalikevirus in 2012.[4] References1. ^1 2 3 {{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/790.html|publisher=ExPASy|accessdate=1 July 2015}} 2. ^1 {{cite web|last1=ICTV|title=Virus Taxonomy: 2014 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=1 July 2015}} 3. ^1 {{cite web|last1=NCBI|title=Spbetalikevirus Complete Genomes|url=https://www.ncbi.nlm.nih.gov/genomes/GenomesGroup.cgi?taxid=680116 |accessdate=18 February 2015}} 4. ^{{cite web|last1=ICTV|title=Virus Taxonomy: 2013 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=18 February 2015}} External links
3 : Siphoviridae|Caudovirales|Bacillus phages |
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