1887

Abstract

The complete nucleotide sequence (6043 nt) of RNA 1 from (PMTV-Sw), the type member of the genus , was determined. The first (5′-terminal) open reading frame (ORF 1) encodes a predicted protein of 148 kDa. ORF 2 extends through the opal stop codon of ORF 1 producing a predicted readthrough protein of 206 kDa which resembles the RNA-dependent RNA polymerases (RdRp) of other fungal-transmitted viruses. It includes a methyltransferase, a helicase and a GDD RdRp motif, respectively. Phylogenetic analyses of RdRps indicated that PMTV is most closely related to (genus), (genus) and (genus), and is more distantly related to the other viruses of the former furovirus group. The 5′ and 3′ termini of RNA 1 in PMTV contained untranslated regions (UTR) of 114 nt and 489 nt, respectively. The 3′-UTR of RNA 1 contained a tRNA-like structure, which has previously been reported in the 3′-UTR of RNA 2 but not RNA 3. However, in this study, the tRNA-like structure was also found in the 3′-UTR of RNA 3, which confirms its presence in the 3′-UTRs of all three RNAs of PMTV.

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1999-10-01
2019-12-11
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