In vivo testing of a tobacco plastid DNA segment for guide RNA function in psbL editing |
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Authors: | Ralph Bock and Pal Maliga |
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Institution: | (1) Waksman Institute, Rutgers, The State University of New Jersey, P.O. Box 759, 08855-0759 Piscataway, NJ, USA;(2) Present address: Institut für Biologic III, Universität Freiburg, Schänzlestr. 1, D-79104 Freiburg, Germany |
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Abstract: | 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. |
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Keywords: | RNA editing Trans-acting factor Guide RNA psbL gene Plastid transformation |
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