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  • Title: A novel putative virus of Gremmeniella abietina type B (Ascomycota: Helotiaceae) has a composite genome with endornavirus affinities.
    Author: Tuomivirta TT, Kaitera J, Hantula J.
    Journal: J Gen Virol; 2009 Sep; 90(Pt 9):2299-305. PubMed ID: 19494051.
    Abstract:
    Ascospore and mycelial isolates of Gremmeniella abietina type B were found to contain three different dsRNA molecules with approximate lengths of 11, 5 and 3 kb. The 11 kb dsRNA encoded the genome of a putative virus and is named Gremmeniella abietina type B RNA virus XL (GaBRV-XL). GaBRV-XL probably exists in an unencapsulated state. We identified two distinct dsRNAs (10 374 and 10 375 bp) of GaBRV-XL, both of which coded for the same putative polyprotein (3249 amino acids) and contained four regions similar to putative viral methyltransferases, DExH box helicases, viral RNA helicase 1 and RNA-dependent RNA polymerases. While a cysteine-rich region with several CxCC motifs in GaBRV-XL was similar to that of putative endornaviruses, cluster analyses of conserved regions revealed GaBRV-XL to be distinct from a broad range of viral taxa but most closely related to Discula destructiva virus 3. Collectively, these findings suggest that GaBRV-XL represents a novel virus group related to endornaviruses.
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