Nucleic Acids Research Advance Access published online on September 29, 2008
Nucleic Acids Research, doi:10.1093/nar/gkn629
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Amino acid sequence variations in Nicotiana CRR4 orthologs determine the species-specific efficiency of RNA editing in plastids
1Department of Botany, Graduate School of Science, Kyoto University, Oiwake-cho, Kitashirakawa, Sakyo-ku, Kyoto 606-8502, Japan and 2Graduate School of Agriculture, Kyushu University, 6-10-1, Hakozaki, Higashi-ku, Fukuoka 812-8581, Japan
*To whom correspondence should be addressed. Tel: + 81 75 753 4247; Fax: + 81 75 753 4257; Email: shikanai{at}pmg.bot.kyoto-u.ac.jp
Received August 1, 2008. Revised September 10, 2008. Accepted September 12, 2008.
In flowering plants, RNA editing is a posttranscriptional process that converts specific C to U in organelle mRNAs. Nicotiana tabacum is an allotetraploid species derived from the progenitors of Nicotiana sylvestris and Nicotiana tomentosiformis. These Nicotiana species have been used as a model for understanding the mechanism and evolution of RNA editing in plastids. In Nicotiana species, the ndhD-1 site is edited to create the translational initiation codon of ndhD that encodes a subunit of the NAD(P)H dehydrogenease (NDH) complex. An analysis of this RNA editing revealed that editing efficiency in N. tomentosiformis is lower (15%) than that in N. tabacum (42%) and N. sylvestris (37%). However, this level of editing is sufficient for accumulating the NDH complex and its activity. The heterogous complementation of Arabidopsis crr4-3 mutant, in which RNA editing of ndhD-1 is completely impaired, with CRR4 orthologous genes derived from Nicotiana species suggested that the reduction in editing efficiency in N. tomentosiformis is caused by amino acid variations accumulating in CRR4.
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