Nucleotide sequence of both genomic RNAs of a North American tobacco rattle virus isolate

Nucleotide sequence of both genomic RNAs of a North American tobacco rattle virus isolate The complete sequence of a North American tobacco rattle virus (TRV) isolate, ‘Oregon yellow’ (ORY), was determined from cDNA and RT-PCR clones derived from the two genomic RNAs of this isolate. The RNA-1 is 6790 bases and RNA-2 is 3261 bases. The sequence of TRV-ORY RNA-1 was similar to RNA-1 of TRV isolate SYM, and differs in 48 nucleotides. TRV-ORY RNA-1 was one base shorter than -SYM, and had 47 base substitutions resulting in 12 amino acid substitutions of which 4 were conservative. The RNA-2 of TRV-ORY was distinct from RNA-2 of other characterized TRV isolates and contained three open reading frames (ORFs) that could potentially code for proteins of MW 22.4 kDa, 37.6 kDa and 17.9 kDa. Based on the homology of the predicted amino acid sequence with those of other tobraviruses, ORF1 of RNA-2 encodes the coat protein (CP). The protein sequence of ORF2 had regions of limited similarity with those of ORF2 of two other TRV isolates and pea early browning tobravirus. The ORF3 was unique to TRV-ORY. Phylogenetic analysis of tobravirus CPs indicated that TRV-ORY was most closely related to pepper ringspot tobravirus and TRV-TCM. The relationship of tobravirus CPs to other rod-shaped tubular plant viruses vis also discussed. Archives of Virology Springer Journals

Nucleotide sequence of both genomic RNAs of a North American tobacco rattle virus isolate

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