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

Unusual noncanonical intron editing is important for tRNA splicing in Trypanosoma brucei.
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DOI:
10.1016/j.molcel.2013.08.042
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发表时间:
2013-10-24
期刊:
影响因子:
16
通讯作者:
Alfonzo, Juan D.
Alfonzo, Juan D.
中科院分区:
生物学1区
文献类型:
--
作者:
Rubio, Mary Anne T.;Paris, Zdenek;Gaston, Kirk W.;Fleming, Ian M. C.;Sample, Paul;Trotta, Christopher R.;Alfonzo, Juan D.

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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 post-transcriptional nucleotide chemical modifications. In Trypanosoma brucei the single intron-containing tRNA (tRNATyrGUA) is responsible for decoding all tyrosine codons; therefore, intron removal is essential for viability. We show by molecular and biochemical approaches the presence of several non-canonical editing events, within the intron of pre-tRNATyrGUA, 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 for the first time the functional significance of non-canonical editing with implications for tRNA processing in the deeply divergent kinetoplastid lineage and eukaryotes in general.
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