Abstract:
:The complete genome sequence of Nootka lupine vein-clearing virus (NLVCV) was determined to be 4,172 nucleotides in length containing four open reading frames (ORFs) with a similar genetic organization of virus species in the genus Carmovirus, family Tombusviridae. The order and gene product size, starting from the 5'-proximal ORF consisted of: (1) polymerase/replicase gene, ORF1 (p27) and ORF1RT (readthrough) (p87), (2) movement proteins ORF2 (p7) and ORF3 (p9), and, (3) the 3'-proximal coat protein ORF4, (p37). The genomic 5'- and 3'-proximal termini contained a short (59 nt) and a relatively longer 405 nt untranslated region, respectively. The longer replicase gene product contained the GDD motif common to RNA-dependent RNA polymerases. Phylogenetically, NLVCV formed a subgroup with the following four carmoviruses when separately comparing the amino acids of the coat protein or replicase protein: Angelonia flower break virus (AnFBV), Carnation mottle virus (CarMV), Pelargonium flower break virus (PFBV), and Saguaro cactus virus (SgCV). Whole genome nucleotide analysis (percent identities) among the carmoviruses with NLVCV suggested a similar pattern. The species demarcation criteria in the genus Carmovirus for the amino acid sequence identity of the polymerase (<52%) and coat (<41%) protein genes restricted NLVCV as a distinct species, and instead, placed it as a tentative strain of CarMV, PFBV, or SgCV when both the polymerase and CP were used as the determining factors. In contrast, the species criteria that included different host ranges with no overlap and lack of serology relatedness between NLVCV and the carmoviruses, suggested that NLVCV was a distinct species. The relatively low cutoff percentages allowed for the polymerase and CP genes to dictate the inclusion/exclusion of a distinct carmovirus species should be reevaluated. Therefore, at this time we have concluded that NLVCV should be classified as a tentative new species in the genus Carmovirus, family Tombusviridae.
journal_name
Virus Genesjournal_title
Virus genesauthors
Robertson NL,Côté F,Paré C,Leblanc E,Bergeron MG,Leclerc Ddoi
10.1007/s11262-007-0139-3subject
Has Abstractpub_date
2007-12-01 00:00:00pages
807-14issue
3eissn
0920-8569issn
1572-994Xjournal_volume
35pub_type
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