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Lettuce big-vein virus (LBVV) is the type species of the genus Varicosavirus and is a two-segmented negative-sense single-stranded RNA virus. The larger LBVV genome segment (RNA1) consists of 6797 nt and encodes an L polymerase that resembles that of rhabdoviruses. Here, the nucleotide sequence of the second LBVV genome segment (RNA2) is reported. LBVV RNA2 consisted of 6081 nt and contained antisense information for five major ORFs: ORF1 (nt 210-1403 on the viral RNA), ORF2 (nt 1493-2494), ORF3 (nt 2617-3489), ORF4 (nt 3843-4337) and ORF5 (nt 4530-5636), which had coding capacities of 44, 36, 32, 19 and 41 kDa, respectively. The gene at the 3' end of the viral RNA encoded a coat protein, while the other four genes encoded proteins of unknown functions. The 3'-terminal 11 nt of LBVV RNA2 were identical to those of LBVV RNA1, and the 5'-terminal regions of LBVV RNA1 and RNA2 contained a long common nucleotide stretch of about 100 nt. Northern blot analysis using probes specific to the individual ORFs revealed that LBVV transcribes monocistronic RNAs. Analysis of the terminal sequences, and primer extension and RNase H digestion analysis of LBVV mRNAs, suggested that LBVV utilizes a transcription termination/initiation strategy comparable with that of rhabdoviruses.

journal of general virology

Nucleotide sequence of RNA2 of Lettuce big-vein virus and evidence for a possible transcription termination/initiation strategy similar to that of rhabdoviruses