The complete genomic nucleotide sequence and genome structure of Lily symptomless virus (LSV), a lily-infecting carlavirus, have been obtained. The genome of the Korean strain of LSV, LSV-Kr, was 8,394 nucleotides long and contained six open reading frames (ORFs) coding for proteins of Mr 220 kDa (1,948 aa), 25 kDa (228 aa), 12 kDa (106 aa), 7 kDa (64 aa), 32 kDa (291 aa) and 16 kDa (140 aa) from the 5′ to 3′ end, respectively, which is typical of carlaviruses. Genetic heterogeneity was observed in the ORF1 gene. A total of 221 of 5,847 nucleotides (nt) were heterologous in the ORF1 of replicase; 162 nt portions were silent and 59 nt resulted in amino acid changes. This heterogeneity indicates that the LSV-infecting lily plants contained a genetically heterogeneous population of LSV (quasispecies). Overall similarities to those of other carlaviruses for the six ORFs of LSV were from 76.1% to 31.6% and from 87.3% to 13.7%, at nucleotide and amino acid levels, respectively. The ORF1 replicase gene of LSV shares 40.9% to 56.8% and 48.9% and 58.6% identities with that of 5 other carlaviruses at the amino acid and nucleotide levels, respectively. LSV was closest to Blueberry scorch virus (BlScV) in this ORF, among the carlaviruses for which sequence information is available. The three triple gene blocks (ORF2-4), ORF5 (coat protein) and 3′-proximal 16 kDa ORF6 genes were further analyzed, and phylogenetic trees for the coding regions indicate that the LSV was the most closely related to Kalanchoe latent virus and BlScV. This is the first report of the complete nucleotide sequence and genome structure of LSV.
Archives of Virology – Springer Journals
Published: Oct 1, 2003
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