Cystovirus
Cystovirus | |
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Pseudomonas phage phi6 particle, reconstruction, and genome
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Virus classification | |
(unranked): | Virus |
Realm: | Riboviria |
Kingdom: | Orthornavirae |
Phylum: | Duplornaviricota |
Class: | Vidaverviricetes |
Order: | Mindivirales |
Family: | Cystoviridae |
Genus: | Cystovirus |
Species | |
Cystovirus is a genus of double-stranded RNA viruses which infects bacteria. It is the only genus in the family Cystoviridae. The name of the group cysto derives from Greek kystis which means bladder or sack. There are seven species in this genus.[1][2][3]
Discovery
In 1999, phi7–14 were identified by the laboratory of Leonard Mindich at the Public Health Research Institute associated with
Microbiology
Structure
Cystovirus particles are enveloped, with icosahedral and spherical geometries, and T=13, T=2 symmetry. The virion diameter is around 85 nm. Cystoviruses are distinguished by their outer layer protein and lipid envelope. No other bacteriophage has any lipid in its outer coat, though the Tectiviridae and the Corticoviridae have lipids within their capsids.[1][2]
Genome
Cystoviruses have a tripartite double-stranded RNA genome which is approximately 14 kbp in total length. The genome is linear and segmented, and labeled as large (L) 6.4 kbp, medium (M) 4 kbp, and small (S) 2.9 kb in length. The genome codes for twelve proteins.[1][2]
Life cycle
Cytoviruses enter the bacteria by adsorption on its pilus and then membrane fusion. Viral replication is cytoplasmic. Replication follows the double-stranded RNA virus replication model. Double-stranded RNA virus transcription is the method of transcription. The progeny viruses are released from the cell by lysis.[1][2]
Most identified cystoviruses infect Pseudomonas species, but this is likely biased due to the method of screening and enrichment.[6] There are many proposed members of this family. Pseudomonas viruses φ7, φ8, φ9, φ10, φ11, φ12, and φ13 have been identified and named,[5] but other cystovirus-like viruses have also been isolated.[6] These seven putative relatives are classified as either close (φ7, φ9, φ10, φ11) or distant (φ8, φ12, φ13) relatives to φ6,[5] with the distant relatives thought to infect via the LPS rather than the pili.[7]
However, cystoviruses do not only infect Pseudomonas. But also bacteria of the genera Streptomyces,[8] Microvirgula,[9] Acinetobacter,[10] Lactococcus, Pectobacterium,[11] and possibly other bacterial genera.
Taxonomy
Members of the Cystoviridae appear to be most closely related to the
Other unassigned phages:
- Microvirgula virus phiNY[9]
- Streptomyces virus phi0[8]
- Lactococcus virus phi7-4[11]
- Pectobacterium virus MA14[11]
- Acinetobacter virus CAP3[10]
- Acinetobacter virus CAP4[10]
- Acinetobacter virus CAP5[10]
- Acinetobacter virus CAP6[10]
- Acinetobacter virus CAP7[10]
References
- ^ a b c d e "ICTV Report Cystoviridae".
- ^ a b c d "Viral Zone". ExPASy. Retrieved 15 June 2015.
- ^ "NCBI Taxonomy Browser: Cystoviridae". NCBI. Retrieved 19 June 2016.
- PMID 16789137.
- ^ PMID 10419946.
- ^ PMID 16365305.
- PMID 12033785.
- ^ a b Siddharth R. Krishnamurthy, Andrew B. Janowski,Guoyan Zhao, Dan Barouch, David Wang (2016). Hyperexpansion of RNA Bacteriophage Diversity. PlosOne.
- ^ a b Xiaoyao Cai, Fengjuan Tian, Li Teng, Hongmei Liu, Yigang Tong Tong, Shuai Le, Tingting Zhang (2021). Cultivation of a Lytic Double-Stranded RNA Bacteriophage Infecting Microvirgula aerodenitrificans Reveals a Mutualistic Parasitic Lifestyle. American Society for Microbiology.
- ^ a b c d e f Clay S. Crippen, Bibi Zhou, and Christine M. Szymanski (2021). RNA and Sugars, Unique Properties of Bacteriophages Infecting Multidrug Resistant Acinetobacter radioresistens Strain LH6. NCBI.
- ^ a b c Cystoviridae. NCBI Taxonomy.
- PMID 9250692.
- PMID 25771806.