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Open AccessCommunication
Int. J. Mol. Sci. 2016, 17(5), 641;

Two Novel Relative Double-Stranded RNA Mycoviruses Infecting Fusarium poae Strain SX63

State Key Laboratory for Biology of Plant Disease and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Author to whom correspondence should be addressed.
Academic Editor: Patrick C. Y. Woo
Received: 1 March 2016 / Revised: 14 April 2016 / Accepted: 19 April 2016 / Published: 30 April 2016
(This article belongs to the Special Issue Microbial Genomics and Metabolomics)
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Two novel double-stranded RNA (dsRNA) mycoviruses, termed Fusarium poae dsRNA virus 2 (FpV2) and Fusarium poae dsRNA virus 3 (FpV3), were isolated from the plant pathogenic fungus, Fusarium poae strain SX63, and molecularly characterized. FpV2 and FpV3, with respective genome sequences of 9518 and 9419 base pairs (bps), are both predicted to contain two discontinuous open reading frames (ORFs), ORF1 and ORF2. A hypothetical polypeptide (P1) and a RNA-dependent RNA polymerase (RdRp) are encoded by ORF1 and ORF2, respectively. Phytoreo_S7 domain (pfam07236) homologs were detected downstream of the RdRp domain (RdRp_4; pfam02123) of the ORF2-coded proteins of both FpV2 and FpV3. The same shifty heptamers (GGAAAAC) were both found immediately before the stop codon UAG of ORF1 in FpV2 and FpV3, which could mediate programmed –1 ribosomal frameshifting (–1 PRF). Phylogenetic analysis based on RdRp sequences clearly place FpV2 and FpV3 in a taxonomically unassigned dsRNA mycovirus group. Together, with a comparison of genome organization, a new taxonomic family termed Fusagraviridae is proposed to be created to include FpV2- and FpV3-related dsRNA mycoviruses, within which FpV2 and FpV3 would represent two distinct virus species. View Full-Text
Keywords: novel mycovirus; Fusarium poae; dsRNA virus; Fusagraviridae; FpV2; FpV3 novel mycovirus; Fusarium poae; dsRNA virus; Fusagraviridae; FpV2; FpV3

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Wang, L.; Zhang, J.; Zhang, H.; Qiu, D.; Guo, L. Two Novel Relative Double-Stranded RNA Mycoviruses Infecting Fusarium poae Strain SX63. Int. J. Mol. Sci. 2016, 17, 641.

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