Pospiviroidae

The Pospiviroidae[1] are a family of viroids, including the first viroid to be discovered, PSTVd. Their secondary structure is key to their biological activity. The classification of this family is based on differences in the conserved central region sequence.[2] The genome consists (in this order) of an LH terminal domain, a pathogenic domain, conserved central region (pospiviroid RY motif stem loop), variable domain, and an RH terminal domain.[3] Pospiviroidae replication occurs in an asymmetric fashion via host cell RNA polymerase, RNase, and RNA ligase.

Pospiviroidae
Virus classification
(unranked):	Virus
Realm:	incertae sedis
Kingdom:	incertae sedis
Phylum:	incertae sedis
Class:	incertae sedis
Order:	incertae sedis
Family:	Pospiviroidae
Genera
Pospiviroid Hostuviroid Cocadviroid Apscaviroid Coleviroid

Taxonomy

• Family Pospiviroidae
  • Genus Pospiviroid; type species: Potato spindle tuber viroid
  • Genus Hostuviroid; type species: Hop stunt viroid
  • Genus Cocadviroid; type species: Coconut cadang-cadang viroid
  • Genus Apscaviroid; type species: Apple scar skin viroid
  • Genus Coleviroid; type species: Coleus blumei viroid 1

References

1. Di Serio, F; Owens, RA; Li, SF; Matoušek, J; Pallás, V; Randles, JW; Sano, T; Verhoeven, JTJ; Vidalakis, G; Flores, R; ICTV Report Consortium (17 December 2020). "ICTV Virus Taxonomy Profile: Pospiviroidae". The Journal of General Virology. doi:10.1099/jgv.0.001543. PMID 33331814.
2. "ICTV Report Pospiviroidae".
3. Giguère, Tamara; Perreault, Jean-Pierre; Melcher, Ulrich (4 August 2017). "Classification of the Pospiviroidae based on their structural hallmarks". PLOS ONE. 12 (8): e0182536. doi:10.1371/journal.pone.0182536. PMID 28783761. Most of the members of the Pospiviroidae fold into a rod-like structure which includes five regions: the terminal left (TL), the pathogenic (P), the central (C), the variable (V) and the terminal right (TR).

External links

• ICTV Report: Pospiviroidae
• – extensive information on pospivirioidae and viroids.