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Reference: Karijolich J and Yu YT (2011) Converting nonsense codons into sense codons by targeted pseudouridylation. Nature 474(7351):395-8

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Abstract


All three translation termination codons, or nonsense codons, contain a uridine residue at the first position of the codon. Here, we demonstrate that pseudouridylation (conversion of uridine into pseudouridine (Psi), ref. 4) of nonsense codons suppresses translation termination both in vitro and in vivo. In vivo targeting of nonsense codons is accomplished by the expression of an H/ACA RNA capable of directing the isomerization of uridine to Psi within the nonsense codon. Thus, targeted pseudouridylation represents a novel approach for promoting nonsense suppression in vivo. Remarkably, we also show that pseudouridylated nonsense codons code for amino acids with similar properties. Specifically, PsiAA and PsiAG code for serine and threonine, whereas PsiGA codes for tyrosine and phenylalanine, thus suggesting a new mode of decoding. Our results also suggest that RNA modification, as a naturally occurring mechanism, may offer a new way to expand the genetic code.

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Journal Article
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Karijolich J, Yu YT
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