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pubmed-article:21504904pubmed:abstractTextIn plant organelles, RNA editing is a post-transcriptional mechanism that converts specific cytidines to uridines in RNA of both mitochondria and plastids, altering the information encoded by the gene. The cytidine to be edited is determined by a cis-element surrounding the editing site that is specifically recognized and bound by a trans-acting factor. All the trans-acting editing factors identified so far in plant organelles are members of a large protein family, the pentatricopeptide repeat (PPR) proteins. We have identified the Organelle Transcript Processing 87 (OTP87) gene, which is required for RNA editing of the nad7-C24 and atp1-C1178 sites in Arabidopsis mitochondria. OTP87 encodes an E-subclass PPR protein with an unusually short E-domain. The recombinant protein expressed in Escherichia coli specifically binds to RNAs comprising 30 nucleotides upstream and 10 nucleotides downstream of the nad7-C24 and atp1-C1178 editing sites. The loss-of-function of OTP87 results in small plants with growth and developmental delays. In the otp87 mutant, the amount of assembled respiratory complex V (ATP synthase) is highly reduced compared with the wild type suggesting that the amino acid alteration in ATP1 caused by loss of editing at the atp1-C1178 site affects complex V assembly in mitochondria.lld:pubmed
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pubmed-article:21504904pubmed:articleTitleThe pentatricopeptide repeat protein OTP87 is essential for RNA editing of nad7 and atp1 transcripts in Arabidopsis mitochondria.lld:pubmed
pubmed-article:21504904pubmed:affiliationAustralian Research Council Centre of Excellence in Plant Energy Biology, University of Western Australia, Crawley 6009 Western Australia, Australia. khammani@uoregon.edulld:pubmed
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