In vivo testing of a tobacco plastid DNA segment for guide RNA function in psbL editing

Ralph Bock, Pal Maliga

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


A C-to-U RNA editing event creates a functional initiation codon for translation of the psbL mRNA in tobacco plastids. Small trans-acting guide RNAs (gRNAs) have been shown to be involved in editing site selection in kinetoplastid mitochondria. A computer search of the tobacco plastid genome (ptDNA) identified such a putative gRNA, a 14-nucleotide sequence motif that is complementary to the psbL mRNA, including the A nucleotide required to direct the C-to-U change. The critical A nucleotide of the putative gRNA gene was changed to G by plastid transformation. We report here that the introduced mutation did not abolish psbL editing. Since no other region of the plastid genome contains significant complementarity to the psbL editing site we suggest that, if gRNAs serve as trans-acting factors for plastid psbL mRNA editing, they either have only a limited complementarity to the editing site, or are encoded in the nuclear genome.

Original languageEnglish (US)
Pages (from-to)439-443
Number of pages5
JournalMgg Molecular & General Genetics
Issue number4
StatePublished - Jul 1995

All Science Journal Classification (ASJC) codes

  • Genetics


  • Guide RNA
  • Plastid transformation
  • RNA editing
  • Trans-acting factor
  • psbL gene


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