We have analyzed the role of RNA editing in the correction of mismatched base pairs in tRNA secondary structures in mitochondria of the flowering plant Oenothera berteriana. Comparison of genomic and cDNA sequences from unprocessed primary transcripts of the newly characterized genes for tRNA(Cys), tRNA(Asn) and tRNA(Ile) and the previously described gene for tRNA(Phe) revealed single nucleotide discrepancies in the tRNA(Cys) and tRNA(Phe) sequences. While the change in the anticodon stem of tRNA(Cys) alters a C-T to a T-T mismatch, the nucleotide transition in the tRNA(Phe) restores a conventional T-A Watson-Crick base pair, replacing a C-A mismatch in the acceptor stem. Since both nucleotide alterations are conversions from genomic cytidines to thymidines in the cDNA (uridines in the tRNAs), they are attributed to RNA editing, which is observed in nearly all mRNAs from plant mitochondria.
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