The complete nucleotide sequence of beet necrotic yellow vein virus RNA-1 is presented. The RNA molecule is 6746 nucleotides long excluding the poly(A) tail and has one long open reading frame encoding a polypeptide of 237 389. The 3′ terminal 60 residues of BNYVV RNA-1 display extensive sequence homology with the corresponding portions of BNYVV RNA-2, -3 and -4. Additional 3′ terminal homology exists between RNA-1 and -2. The sequence of the 237 389 RNA-1-encoded polypeptide shares domains of amino acid homology with polypeptides thought to be involved in replication of RNA from tobacco mosaic virus and several other viruses. Amino acid sequence homologies between two open reading frames of BNYVV RNA-2 and two frames of RNA-β from barley stripe mosaic virus have also been detected.


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