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The complete nucleotide sequence of rice dwarf virus (RDV) genome segment 4 was determined. Genome segment 4 was 2468 nucleotides long and had a long open reading frame initiating at nucleotides 64 to 66 and terminating at 2245 to 2247. The deduced polypeptide contained 727 amino acid residues with an M r of 79·8K. Amino acid sequences similar to a ‘zinc- finger’ and purine NTP-binding motifs were present in the deduced polypeptide. Considerable amino acid sequence homology was detected between genome segment 4 of RDV and wound tumor virus (WTV). One of the sequences similar to the ‘zinc-finger’ motif was present in a conserved region of the polypeptide of both viruses. However, the sequence similar to the purine NTP-binding motif was not present in the polypeptide encoded by genome segment 4 of WTV.
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