| 词条 | Schizot4virus | ||||||||||||||||||||||||||||
| 释义 |
| image = | image_alt = | image_caption = | taxon = Schizot4virus | authority = | synonyms =
| synonyms_ref = [1] | type_species = Vibrio virus KVP40 | subdivision_ranks = Species[2] | subdivision =
}}Schizot4virus{{Pronunciation needed|date=January 2019}} is a genus of viruses in the order Caudovirales, in the family Myoviridae, in the subfamily Tevenvirinae. Bacteria serve as natural hosts. There are currently three species in this genus, including the type species Vibrio virus KVP40.[3][4][5] TaxonomyThe following list is a map of T4virus species according to ICTV Master Species List (MSL) 2018a v1:[5] Group: dsDNA
StructureSchizot4viruses are nonenveloped, with a head and tail. The head is a prolate spheroid approximately 140 nm in length and 70 nm in width. The tail is around 140 nm long, has 6 long terminal fibers, 6 short spikes, and a small base plate. The tail is enclosed in a sheath, which loosens and slides around the tail core upon contraction.[3]
GenomeGenomes are linear.[3] All three species have been fully sequenced. They range between 244k and 248k nucleotides, with 381 to 405 proteins. The complete genomes are available from National Center for Biotechnology Information ([https://www.ncbi.nlm.nih.gov/genomes/GenomesGroup.cgi?opt=phage&taxid=1198137 NCBI]), along with the complete genome for Vibrio phage VH7D, an unclassified virus strain.[6] Life cycleViral replication is cytoplasmic. The virus attaches to the host cell using its terminal fibers, and uses viral exolysin to degrade the cell wall enough to eject 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.[3]
HistoryAccording to ICTV's 2010–11 report, the genus Schizot4likevirus was first accepted as a new genus, at the same time as its type species Vibrio phage KVP40, as well as its containing subfamily Tevenvirinae. At the same time, Vibrio phage nt-1 was moved into the genus from its previous classification in T4-like viruses (now T4virus). This proposal is available here.[7] In 2015, the genus was renamed to Schizot4virus.[4] References1. ^{{cite web |title=ICTV Taxonomy history: Schizot4virus |url=https://talk.ictvonline.org/taxonomy/p/taxonomy-history?taxnode_id=20180313 |website=International Committee on Taxonomy of Viruses (ICTV) |accessdate=29 January 2019 |language=en |format=html}} 2. ^{{cite web |title=Virus Taxonomy: 2018 Release |url=https://talk.ictvonline.org/taxonomy/ |website=International Committee on Taxonomy of Viruses (ICTV) |accessdate=29 January 2019 |language=en |format=html |date=October 2018}} 3. ^1 2 3 {{cite web|title=Viral Zone|url=http://viralzone.expasy.org/all_by_species/2820.html|publisher=ExPASy|accessdate=1 July 2015}} 4. ^1 {{cite web|last1=ICTV|title=Virus Taxonomy: 2015 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=4 March 2017}} 5. ^https://talk.ictvonline.org/files/master-species-lists/m/msl/7992 ICTV MSL 2018a v1] 6. ^1 {{cite web|last1=NCBI|title=Schizot4virus Complete Genomes|url=https://www.ncbi.nlm.nih.gov/genomes/GenomesGroup.cgi?opt=phage&taxid=1198137|accessdate=13 February 2015}} 7. ^{{cite web|last1=ICTV|title=Virus Taxonomy: 2013 Release|url=http://ictvonline.org/virusTaxonomy.asp|accessdate=13 February 2015}} External links
3 : Myoviridae|Caudovirales|Tevenvirinae |
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