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An analysis by metabolic labelling of the encephalomyocarditis virus ribosomal frameshifting efficiency and stimulators.
Journal of General Virology 2017 August
Programmed -1 ribosomal frameshifting is a mechanism of gene expression whereby specific signals within messenger RNAs direct a proportion of ribosomes to shift -1 nt and continue translating in the new reading frame. Such frameshifting normally depends on an RNA structure stimulator 3'-adjacent to a 'slippery' heptanucleotide shift site sequence. Recently we identified an unusual frameshifting mechanism in encephalomyocarditis virus, where the stimulator involves a trans-acting virus protein. Thus, in contrast to other examples of -1 frameshifting, the efficiency of frameshifting in encephalomyocarditis virus is best studied in the context of virus infection. Here we use metabolic labelling to analyse the frameshifting efficiency of wild-type and mutant viruses. Confirming previous results, frameshifting depends on a G_GUU_UUU shift site sequence and a 3'-adjacent stem-loop structure, but is not appreciably affected by the 'StopGo' sequence present ~30 nt upstream. At late timepoints, frameshifting was estimated to be 46-76 % efficient.
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