Petuvirus

Petuvirus is a genus of viruses, in the family Caulimoviridae order Ortervirales. Plants serve as natural hosts. There is currently only one species in this genus: the type species Petunia vein clearing virus. Diseases associated with this genus include: plants: chlorotic vein clearing, leaf malformation.[1][2]

Petuvirus
Virus classification
(unranked): Virus
Realm: Riboviria
Kingdom: Pararnavirae
Phylum: Artverviricota
Class: Revtraviricetes
Order: Ortervirales
Family: Caulimoviridae
Genus: Petuvirus
Type species
Petunia vein clearing virus

Taxonomy

Group: ssRNA-RT

[2]

Petuviruses (including other members of the Caulimovirusus such as soymoviruses and Cavemoviruses) form isometric particles whereas members of Badnaviruses and Tungroviruses have bacilliform virus particles.

Structure

Viruses in Petuvirus are non-enveloped, with icosahedral geometries, and T=7 symmetry. The diameter is around 45-50 nm. Genomes are circular and non-segmented.[1] Its genome is 7200 nucleotides long and has a guanine + cytosine content of 38.2%. There are terminally redundant sequences on the genome which have direct terminal repeats that are reiterated internally in inverted form. The virus codes for 2 ORFs. Its capsid shells are multilayered. The capsid is round to elongate with icosahedral symmetry and the virus is composed of 16% nucleic acid. Petuviruses have a buoyant density in CsCl of 1.31 g cm-3 and there are 1 sedimenting component(s) found in purified preparations. The sedimentation coefficient is 218–251.5–285 S20w while the thermal inactivation point (TIP) is at 55–57.5–60 °C.[3][4][5]

GenusStructureSymmetryCapsidGenomic arrangementGenomic segmentation
PetuvirusIcosahedralT=7Non-envelopedCircularMonopartite

Life cycle

Viral replication is nuclear/cytoplasmic. Entry into the host cell is achieved by attachment of the viral proteins to host receptors, which mediates endocytosis. Replication follows the dsDNA(RT) replication model. DNA-templated transcription, specifically dsDNA(RT) transcription is the method of transcription. The virus exits the host cell by nuclear pore export, and tubule-guided viral movement. Plants serve as the natural host. Transmission routes are mechanical and grafting.[1]

GenusHost detailsTissue tropismEntry detailsRelease detailsReplication siteAssembly siteTransmission
PetuvirusPlantsNoneViral movement; mechanical inoculationViral movementNucleusCytoplasmGrafting

References
  1. "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
  3. "MicrobiologyBytes.com". Archived from the original on 24 February 2007. Retrieved 16 March 2007.
  4. DPVWeb.net
  5. AseanBiotechnology.info
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