Biology:Bacilladnavirus
| Bacilladnavirus | |
|---|---|
| Virus classification | |
| Group: | Group II (ssDNA)
|
| Order: | Unassigned
|
| Family: | Bacilladnaviridae
|
| Genus: | Bacilladnavirus
|
| Type species | |
|
Chaetoceros salsugineum DNA virus 01 | |
Bacilladnavirus is a genus of single stranded DNA viruses. Species in this genus infect diatoms.[1] The name is derived from the phrase: ssDNA virus infecting Bacillariophytes.[2] Although other single-stranded DNA viruses which infect diatoms have been discovered (Chaetoceros debilis DNA virus (CdebDNAV), C. tenuissimus DNA virus (CtenDNAV), C. lorenzianus DNA virus (ClorDNAV), C. sp. strain TG07-C28 DNA virus (Csp05DNAV), C. setoensis DNA virus (CsetDNAV), and Thalassionema nitzschioides DNA virus (TnitDNAV)), the only species officially classified in this genus is Chaetoceros salsugineum DNA virus 01 (CsalDNAV01.)[2][3][4] In addition, 4 genomes of uncultured bacilladnaviruses have been sequenced directly from environmental samples.[5][6] It was suggested that the family Bacilladnaviridae be used to classify these viruses. This was accepted by the International Committee on Taxonomy of Viruses with its Master Species List (MSL) as of fall 2018.[7][5]
Genome
The genome of these viruses appears to be unique. It consists of a single molecule of covalently closed circular single stranded DNA of 4.5-6 kilobases as well as a segment of linear ssDNA of ~1 kilobase. The linear segment is complementary to a portion of the closed circle creating a partially double stranded region.
There are at least three major open reading frames. Similar to other eukaryotic ssDNA viruses, bacilladnaviruses are likely to replicate their genomes by the rolling-circle mechanism, initiated by the virus-encoded endonuclease (Rep). However, the latter protein of bacilladnaviruses displays unique conserved motifs and in phylogenetic trees forms a monophyletic clade separated from other groups of ssDNA viruses.[5] The capsid protein of bacilladnaviruses has the jelly-roll fold and is most closely related to the corresponding proteins from members of the family Nodaviridae, which have ssRNA genomes.[5]
Virology
These viruses have been isolated from diatoms of the genus Chaetoceros.[8][1]
The virions are ~34 nanometers (nm) in diameter.
The virions accumulate in the nucleus.
Mature virions are released by lysis of the host.
References
- ↑ 1.0 1.1 Tomaru, Y; Takao, Y; Suzuki, H; Nagumo, T; Koike, K; Nagasaki, K (2011). "Isolation and Characterization of a Single-Stranded DNA Virus Infecting Chaetoceros lorenzianus Grunow". Applied and Environmental Microbiology 77 (15): 5285–5293. doi:10.1128/AEM.00202-11. PMID 21666026.
- ↑ 2.0 2.1 ICTV proposals 2009.002a-fF et al., Yuji Tomaru, Keizo Nagasaki. Accessed on line Nov. 20, 2015.
- ↑ ICTV Virus Taxonomy 2014 , accessed on line Nov. 20, 2015.
- ↑ Kimura, K; Tomaru, Y (2013). "Isolation and Characterization of a Single-Stranded DNA Virus Infecting the Marine Diatom Chaetoceros sp. Strain SS628-11 Isolated from Western JAPAN". PLoS ONE 8 (12): e82013. doi:10.1371/journal.pone.0082013. PMID 24358139. Bibcode: 2013PLoSO...882013K.
- ↑ 5.0 5.1 5.2 5.3 Kazlauskas, D; Dayaram, A; Kraberger, S; Goldstien, S; Varsani, A; Krupovic, M (2017). "Evolutionary history of ssDNA bacilladnaviruses features horizontal acquisition of the capsid gene from ssRNA nodaviruses.". Virology 504: 114–121. doi:10.1016/j.virol.2017.02.001. PMID 28189969.
- ↑ McDaniel, LD; Rosario, K; Breitbart, M; Paul, JH (February 2014). "Comparative metagenomics: natural populations of induced prophages demonstrate highly unique, lower diversity viral sequences.". Environmental Microbiology 16 (2): 570–85. doi:10.1111/1462-2920.12184. PMID 23879711.
- ↑ ICTV Virus Taxonomy 2018, accessed on line Apr. 2019.
- ↑ Nagasaki, K; Tomaru, Y; Takao, Y; Nishida, K; Shirai, Y; Suzuki, H; Nagumo, T (2005). "Previously Unknown Virus Infects Marine Diatom". Applied and Environmental Microbiology 71 (7): 3528–3535. doi:10.1128/AEM.71.7.3528-3535.2005. PMID 16000758.
Wikidata ☰ Q4838939 entry
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