Identification of a novel mycovirus isolated from Rhizoctonia solani (AG 2-2 IV) provides further information about genome plasticity within the order Tymovirales

Identification of a novel mycovirus isolated from Rhizoctonia solani (AG 2-2 IV) provides further... The complete genome of a novel mycovirus, named Rhizoctonia solani flexivirus 1 (RsFV-1), which infects an avirulent strain of Rhizoctonia solani AG 2-2 IV, was sequenced and analyzed. Its RNA genome consists of 10,621 nucleotides, excluding the poly-A tail, and encodes a single protein of 3477 amino acids. The identification of conserved motifs of methyltransferase, helicase and RNA-dependent RNA polymerase revealed its relatedness to members of the alphavirus-like superfamily of positive-strand RNA viruses. Phylogenetic analysis of these fused domains suggested that this virus should be assigned to the order Tymovirales. The recently described Fusarium graminearum deltaflexivirus 1 was found to be its closest relative. However, the whole genome, as well as the encoded protein of RsFV-1, is larger than that of other known members of the order Tymovirales, and unlike all other viruses belonging to this order, its methyltransferase domain is not located at the N-terminus of the replicase. Although genome diversity, as a result of recombination and gene loss, is a well-documented trait in members of the order Tymovirales, no related virus with a comparable genome alteration has been reported before. For these reasons, RsFV-1 broadens our perception about genome plasticity and diversity within the order Tymovirales. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Archives of Virology Springer Journals

Identification of a novel mycovirus isolated from Rhizoctonia solani (AG 2-2 IV) provides further information about genome plasticity within the order Tymovirales

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Publisher
Springer Vienna
Copyright
Copyright © 2016 by Springer-Verlag Wien
Subject
Biomedicine; Virology; Medical Microbiology; Infectious Diseases
ISSN
0304-8608
eISSN
1432-8798
D.O.I.
10.1007/s00705-016-3085-3
Publisher site
See Article on Publisher Site

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