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The sequence of the 3'-terminal 2077 nucleotides of genomic RNA 1 and the complete sequence of genomic RNA 2 of tobacco rattle virus (TRV, strain PSG) has been deduced. RNA 2 (1905 nucleotides) contains a single open reading frame for the viral coat protein (209 amino acids), flanked by 5'- and 3'-noncoding regions of 570 and 708 nucleotides, respectively. A subgenomic RNA (RNA 4) was found to lack the 5'-terminal 474 nucleotides of RNA 2 and is the putative messenger for coat protein. The deduced RNA 1 sequence contains the 3'-terminal part of a reading frame that probably corresponds to the TRV 170K protein and reading frames for a 29K protein and a 16K protein. Proteins encoded by the first two reading frames show significant amino acid sequence homology with corresponding proteins encoded by tobacco mosaic virus. Subgenomic RNAs 3 (1.6 kb) and 5 (0.7 kb) were identified as the putative messengers for the 29K and 16K proteins, respectively. At their 3'-termini all PSG-RNAs have an identical sequence of 497 nucleotides; at the 5'-termini homology is limited to 5 to 10 bases.

Analysis of the genome structure of tobacco rattle virus strain PSG