imported>Lcovelli at 12:13, 15 March 2010

2010-03-15T12:13:14Z

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{{Element
|genbank=[http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?db=nucleotide&val=194399158 194399158]
|type=
|genus= Badnavirus
|subfamily= Class 2
|family= Caulimoviridae
|group= LTR retroelements
|description=Although cycad (''Cycas revolute'') is a plant species native to southern Japan, now is one of the most propagated and sold potted plant species in the world, growing outdoors in warm temperate and subtropical regions, or under glass in colder areas. Its common name "Sago Palm" has often originated a misunderstanding on its botanic taxonomy due to the fact that it is not a palm (Angiosperm, Monocotyledon) but it is a Gymnosperm. Recently has been identified the first plant pararetrovirus of ''Badnavirus'' genus in a Gymnosperm. It is infecting cycads from which derives its name ''Cycad leaf necrosis virus'' (CLNV) ([http://www.ncbi.nlm.nih.gov/nuccore/194399158 Lockhart ''et al.'' 2008], unpublished). CLNV belongs to ''Caulimoviridae'' family (''International Committee on the Taxonomy of Viruses'' -ICTV- [[Literature:100589|Fauquet ''et al''. 2005]]) and according to [[Literature:100596|Llorens ''et al''. 2009]] is located within Class 2 of the [[Caulimoviridae|''Caulimoviridae'']] family.

Although CLNV is still an unclassificated badnavirus, it is probably the larger species sequenced among the genus because its bacilliform virions contain a circular dsDNA of about 9 Kb in size (9205 bp long) ([http://www.ncbi.nlm.nih.gov/nuccore/194399158 Lockhart ''et al.'' 2008], unpublished). The genome of CLNV contains the three Open reading frames (ORFs I, II, III) characteristic of ''Badnavirus'' genus which potentially encoded proteins with molecular masses similar to those of the corresponding proteins of other badnavirus species. ORF I potentially encodes a 19.8 kDa protein showing sequence similarity to the ''Caulimoviridae'' virion associated proteins (VAPs) encoded by the corresponding ORFs I. The function of ORFII product (14.1 kDa) is still unknown even if a DNA-binding property has been hypothesized for the ORF II products of some badnaviruses ([[Literature:86820|Borah ''et al.'' 2009]]; [[Literature:100640|Jacquot ''et al.'' 1996]]). As reported for other badnaviruses, the ORF III product is a polyprotein with the typical cell-to-cell movement protein (MOV), viral coat protein (COAT), aspartic protease (PR), reverse transcriptase (RT) and RNase H (RH) domains. It includes a "RNA-binding" motif sequence "C-X-C-X2-C-X4-H-X4-C" and a second large cysteine-rich region "C-X2-C-X11-C-X2-C-X4-C-X2-C" (only observed in Badna- and Tungroviruses) located at the C-terminus of the COAT (gag)-like region and similar to those identified in the nucleocapsid domains of LTR retroelements ([[Literature:100596|Llorens ''et al''. 2009]]).
|structure=CLNV.png
|host=Cycadaceae
|hostpic=Cycadaceae.jpg
|literature=
|picowner=[http://www.biotechvana.com Image, Laura Covelli, Copyright, GyDB, Biotech Vana]

}}
[[Category:Element]]

Element:CLNV - Revision history

imported>Lcovelli at 12:13, 15 March 2010