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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. 相似文献
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AEF1/MPR25 is implicated in RNA editing of plastid atpF and mitochondrial nad5, and also promotes atpF splicing in Arabidopsis and rice 下载免费PDF全文
Aaron Yap Peter Kindgren Catherine Colas des Francs‐Small Tomohiko Kazama Sandra K. Tanz Kinya Toriyama Ian Small 《The Plant journal : for cell and molecular biology》2015,81(5):661-669
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