Phylogenetic relationships of closely related potyviruses infecting sweet potato determined by genomic characterization of Sweet potato virus G and Sweet potato virus 2.

Virus Genes
Fan LiRuhui Li

Abstract

Complete nucleotide sequences of Sweet potato virus G (SPVG) and Sweet potato virus 2 (SPV2) were determined to be 10,800 and 10,731 nucleotides, respectively, excluding the 3'-poly(A) tail. Their genomic organizations are typical of potyviruses, encoding a polyprotein which is likely cleaved into 10 mature proteins by three viral proteinases. Conserved motifs of orthologous proteins of viruses in the genus Potyvirus are found in corresponding positions of both viruses. Pairwise comparisons of individual protein sequences of the two viruses with those of 78 other potyviruses show that P1 protein and coat protein (CP) of both viruses are significantly large, with the SPVG CP as the largest among the all the known species of the genus Potyvirus. The extended N-terminal region of the P1 protein is conserved in the potyviruses and ipomovirus infecting sweet potato. A novel ORF, PISPO, is identified within the P1 region of SPVG, SPV2, Sweet potato feathery mottle virus (SPFMV), and Sweet potato virus C (SPVC). The C-terminal half of CP is highly conserved among SPFMV, SPVC, SPVG, SPV2, and Sweet potato virus-Zimbabwe. Phylogenetic analysis based on the deduced CP amino acid sequences supports the view that these five viruses are gro...Continue Reading

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Citations

Jul 25, 2012·Virus Genes·P E Rodríguez PardinaL Di Feo
Mar 22, 2016·Bioresource Technology·Avtar S MatharuJoseph A Houghton
Jun 4, 2016·Genome Announcements·Solomon MainaRoger A C Jones
Sep 10, 2016·Genome Announcements·Solomon MainaRoger A C Jones
Feb 14, 2013·Avian Diseases·Ana S Gonzalez-Reicheabc, Daniel R Perez

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