Tombusvirus
| Tombusvirus | |
|---|---|
| Virus classification | |
| Group: |
Group IV ((+)ssRNA)
|
| Family: | |
| Genus: |
Tombusvirus
|
| Type Species | |
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Tombusvirus is a genus of viruses, in the family Tombusviridae. Plants serve as natural hosts. There are currently 17 species in this genus including the type species Tomato bushy stunt virus. Symptoms associated with this genus include: mosaic.[1][2] The name of the genus comes from the type species: Tomato bushy shunt virus.
Taxonomy
Group: ssRNA(+)
-
Family: Tombusviridae
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Genus: Tombusvirus
- Artichoke mottled crinkle virus
- Carnation Italian ringspot virus
- Cucumber Bulgarian virus
- Cucumber necrosis virus
- Cymbidium ringspot virus
- Eggplant mottled crinkle virus
- Grapevine Algerian latent virus
- Havel River virus
- Lato River virus
- Limonium flower distortion virus
- Moroccan pepper virus
- Neckar River virus
- Pelargonium leaf curl virus
- Pelargonium necrotic spot virus
- Petunia asteroid mosaic virus
- Sitke waterborne virus
- Tomato bushy stunt virus
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Structure
Viruses in Tombusvirus are non-enveloped, with icosahedral and Spherical geometries, and T=3 symmetry. The diameter is around 28-34 nm. Genomes are linear and non-segmented, positive sense, single-stranded RNA, around 4-5.4kb in length.[1] These virions have a regular surface structure and are composed of 17% nucleic acid.
| Genus | Structure | Symmetry | Capsid | Genomic Arrangement | Genomic Segmentation |
|---|---|---|---|---|---|
| Tombusvirus | Icosahedral | T=3 | Non-Enveloped | Linear | Monopartite |
Life Cycle
Viral replication is cytoplasmic, and is lysogenic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded rna virus transcription, using the premature termination model of subgenomic RNA transcription is the method of transcription. Translation takes place by suppression of termination. The virus exits the host cell by tubule-guided viral movement. Plants serve as the natural host. Transmission routes are mechanical, seed borne, and contact.[1]
| Genus | Host Details | Tissue Tropism | Entry Details | Release Details | Replication Site | Assembly Site | Transmission |
|---|---|---|---|---|---|---|---|
| Tombusvirus | Plants | None | Viral movement; mechanical innoculation | Viral movement | Cytoplasm | Cytoplasm | Mechanical: contact; seed |
The virus uses the cis-regulatory elements, Tombus virus defective interfering (DI) RNA region 3 and Tombusvirus 5' UTR to control expression of defective interfering RNAs and viral RNA replication.[3][4]
References
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