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THE PLANT CELL, Vol 2, Issue 12 1283-1290, Copyright © 1990 by American Society of Plant Biologists

RESEARCH ARTICLES

RNA Editing of Wheat Mitochondrial ATP Synthase Subunit 9: Direct Protein and cDNA Sequencing

D. Begu, P. V. Graves, C. Domec, G. Arselin, S. Litvak and A. Araya
Institut de Biochimie Cellulaire et Neurochimie du Centre National de la Recherche Scientifique, 1, rue Camille Saint-Saens, 33077 Bordeaux Cedex, France

RNA editing of subunit 9 of the wheat mitochondrial ATP synthase has been studied by cDNA and protein sequence analysis. Most of the cDNA clones sequenced (95%) showed that editing by C-to-U transitions occurred at eight positions in the coding region. Consequently, 5 amino acids were changed in the protein when compared with the sequence predicted from the gene. Two edited codons gave no changes (silent editing). One of the C-to-U transitions generated a stop codon by modifying the arginine codon CGA to UGA. Thus, the protein produced is 6 amino acids shorter than that deduced from the genomic sequence. Minor forms of cDNA with partial or overedited sequences were also found. Protein sequence and amino acid composition analyses confirmed the results obtained by cDNA sequencing and showed that the major form of edited atp9 mRNA is translated.


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Copyright © 1990 by the American Society of Plant Biologists