Crinivirus

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Crinivirus
Virus classification
Group:
Group IV ((+)ssRNA)
Family:
Closteroviridae
Genus:
Crinivirus
Type Species

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3'-terminal pseudoknot in SPCSV
200px
Predicted secondary structure of the 3'-terminal pseudoknot in SPCSV
Identifiers
Symbol  ?
Rfam RF01091
Other data
RNA type Cis-reg
Domain(s) Crinivirus

Crinivirus, formerly the lettuce infectious yellows virus group, is a genus of viruses , in the family Closteroviridae. They are linear, single-stranded positive sense RNA viruses (and are therefore group IV).[1] There are currently 13 species in this genus including the type species Lettuce infectious yellows virus. Diseases associated with this genus include: yellowing and necrosis, particularly affecting the phloem.[2][3]

Examples of species whose entire genomes have been sequenced that are currently classified into the genus include the Sweet potato chlorotic stunt virus (SPCSV) and the Lettuce infectious yellows virus (LIYV).[4][5]

Genetics

The viruses of this genus have segmented, bipartite genomes that add up to 7,500–19,500 nucleotides in length. Their genomes also code for proteins that do not form part of the virion particles as well as structural proteins. The Universal Virus Database describes that their genome sequences near their 3'-ends are capable of hairpin-loop formation and also believe that their 5'-ends may have methylated caps.[5] Each of the viral RNA molecules contains four hair-pin structures and a pseudoknot in the 3'UTR. The pseudoknot is unusual in that it contains a small stem-loop structure inside loop L1.[6] In the related genus Closterovirus, these secondary structures have been found to be important in viral RNA replication.[7]

Structure

Viruses in Crinivirus are non-enveloped, with bipartite filamentous geometries. The diameter is around 10-13 nm, with a length of 700-900 nm. Genomes are linear and bipartite, around 17.6kb in length.[2]

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation
Crinivirus Filamentous Non-Enveloped Linear Monopartite

Life Cycle

Viral replication is cytoplasmic. 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 is the method of transcription. The virus exits the host cell by tubule-guided viral movement. Plants serve as the natural host. The virus is transmitted via a vector (bemisia tabaci). Transmission route is mechanical.[2]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
Crinivirus Plants None Viral movement; mechanical innoculation Viral movement Cytoplasm Cytoplasm Mechanical innoculation: insects

Taxonomy

Group: ssRNA(+)

Order: Unassigned

[3]

References

  1. ↑ ICTVdB Management (2006). 00.017.0.02. Crinivirus. In: ICTVdB—The Universal Virus Database, version 4. Büchen-Osmond, C. (Ed), Columbia University, New York, USA
  2. ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ Journal of Virology. 2002 September; 76(18): 9260–9270
  5. ↑ 5.0 5.1 ICTVdB Management (2006)
  6. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links

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