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  • Title: Terminal structure of hypovirulence-associated dsRNAs in the chestnut blight fungus Endothia parasitica.
    Author: Hiremath S, L'Hostis B, Ghabrial SA, Rhoads RE.
    Journal: Nucleic Acids Res; 1986 Dec 22; 14(24):9877-96. PubMed ID: 3808956.
    Abstract:
    The 3'- and 5'-terminal sequences of the five large double-stranded RNA species (L-dsRNA; 4.5-6.0 X 10(6) daltons) of EP713, a hypovirulent strain of Endothia parasitica, were determined by mobility-shift and enzymatic methods. All the L-dsRNAs appeared to have identical terminal sequences. A heteropolymer sequence was found at one 3'-terminus and a poly(A) sequence of variable length at the other. It was possible to label only one 5'-terminus using polynucleotide kinase and [gamma-32P]ATP, and this was shown to be a poly(U) sequence of variable length. We propose that the dsRNAs have the following structure, where X represents a blocking group: (Formula: see text). A recombinant plasmid containing dsRNA-related sequences was constructed. Hybridization analysis using the recombinant probe indicated that the sequence homology among the L-dsRNAs extended beyond these terminal regions and was also shared by small dsRNAs (0.3-0.45 X 10(6) daltons).
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