The complete genome sequence of a novel dsRNA virus isolated from Rhizoctonia fumigata AG-Ba isolate C-314 Baishi (designated as Rhizoctonia fumigata virus 1, RfV1) was determined. The RfV1 genome was 9,907 bp in length and contained two open reading frames (ORFs). ORF1 potentially coded for a 198.10-kDa protein (P1). P1 shared low but significant amino acid sequence similarity to the putative protein encoded by Lentinula edodes mycovirus (LeV) ORF1. P1 contained a NUDIX domain, which was also present in the putative proteins encoded by the ORF1s of LeV and Phlebiopsis gigantea large virus 1 (PgLV-1). ORF2 potentially coded for a 146.72-kDa protein (P2) that contained the conserved motifs of the RNA-dependent RNA polymerase (RdRp). ORF1 and ORF2 were overlapping, and it was predicted that ORF2 could be translated as a fusion with ORF1 via a ribosomal -1 frameshifting mechanism. Phylogenetic analysis indicated that RfV1 clustered with PgLV-1, LeV and Rosellinia necatrix megabirnavirus 1 (RnMBV1) in a separate clade independent of other virus genera. We propose that RfV1, along with PgLV-1 and LeV, should be grouped into a new viral genus related to the family Megabirnaviridae. This is the first report of the full-length genome sequence of a novel mycovirus isolated from R. fumigata.
Archives of Virology – Springer Journals
Published: Jul 3, 2015
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