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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

The double-stranded RNA genome of yeast virus L-A encodes its own putative RNA polymerase by fusing two open reading frames.

The L-A double-stranded RNA virus of Saccharomyces cerevisiae encodes its major coat protein (80 kDa) and a minor single-stranded RNA binding protein (180 kDa) that has immunological cross-reactivity with the major coat protein. The sequence of L-A cDNA clones revealed two open reading frames (ORF), ORF1 and ORF2. These two reading frames overlap by 130 base pairs and ORF2 is in the -1 reading frame with respect to ORF1. Although the major coat protein of the viral particles is encoded by ORF1, the 180-kDa protein is derived from the entire double-stranded RNA genome by fusing ORF1 and ORF2, probably by a -1 translational frameshift. Within the overlapping region is a sequence similar to that producing a -1 frameshift by "simultaneous slippage" in retroviruses. The coding sequence of ORF2 shows a pattern characteristic of viral RNA-dependent RNA polymerases of icosahedral (+)-strand RNA viruses. Thus, the 180-kDa protein is analogous to gag-pol fusion proteins.[1]


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