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Abstract

Orchid fleck virus (OFV) has an unusual bipartite negative-sense RNA genome with clear sequence similarities to those of nucleorhabdoviruses. The OFV genome consists of two single-stranded RNA molecules, RNA1 and RNA2 that are 6413 and 6001 nt long, respectively, with open reading frame (ORF) information in the complementary sense. RNA1 encodes 49 (ORF1), 26 (ORF2), 38 (ORF3), 20 (ORF4) and 61 kDa (ORF5) proteins, and RNA2 encodes a single protein of 212 kDa (ORF6). ORF1, ORF5 and ORF6 proteins had significant similarities (21–38 % identity) to the nucleocapsid protein (N), glycoprotein (G) and polymerase (L) gene products, respectively, of other rhabdoviruses, especially nucleorhabdoviruses, whereas ORF2, ORF3 and ORF4 proteins had no significant similarities to other proteins in the international databases. Similarities between OFV and rhabdoviruses were also found in the sequence complementarity at both termini of each RNA segment (the common terminal sequences are 3′-UGUGUC---GACACA-5′), the conserved intergenic sequences and in being negative sense. It was proposed that a new genus in the family of the order should be established with OFV as its prototype member and type species.

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2006-08-01
2019-11-21
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