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Mol Cell. 2013 Oct 24;52(2):184-92. doi: 10.1016/j.molcel.2013.08.042. Epub 2013 Oct 3.

Unusual noncanonical intron editing is important for tRNA splicing in Trypanosoma brucei.

Author information

1
Department of Microbiology and The Center for RNA Biology, The Ohio State University, Columbus, OH 43210, USA.

Abstract

In cells, tRNAs are synthesized as precursor molecules bearing extra sequences at their 5' and 3' ends. Some tRNAs also contain introns, which, in archaea and eukaryotes, are cleaved by an evolutionarily conserved endonuclease complex that generates fully functional mature tRNAs. In addition, tRNAs undergo numerous posttranscriptional nucleotide chemical modifications. In Trypanosoma brucei, the single intron-containing tRNA (tRNA(Tyr)GUA) is responsible for decoding all tyrosine codons; therefore, intron removal is essential for viability. Using molecular and biochemical approaches, we show the presence of several noncanonical editing events, within the intron of pre-tRNA(Tyr)GUA, involving guanosine-to-adenosine transitions (G to A) and an adenosine-to-uridine transversion (A to U). The RNA editing described here is required for proper processing of the intron, establishing the functional significance of noncanonical editing with implications for tRNA processing in the deeply divergent kinetoplastid lineage and eukaryotes in general.

PMID:
24095278
PMCID:
PMC3825838
DOI:
10.1016/j.molcel.2013.08.042
[Indexed for MEDLINE]
Free PMC Article

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