Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 98:1261-1263 (1992)
© 1992 American Society of Plant Biologists

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Molecular Biology and Gene Regulation

RNA Editing of Cytochrome Oxidase Subunit III in Sunflower Mitochondria 1

Adolfo Saiardi and Carla Quagliariello

Dipartimento di Biologia Cellulare, Università della Calabria, 87030 Arcavacata di Rende, Italy

Direct sequencing of cytochrome oxidase subunit III (coxIII) mRNA with a specific primer confirms RNA editing in sunflower (Helianthus annus) mitochondria. Six instances of mRNA editing could be verified, one of these specific to this species. All the editing events involve C to U transitions in the coxIII mRNA causing codon changes that lead to amino acids better conserved in evolution than those encoded in the genomic DNA. This observation confirms RNA editing to be widespread in higher plant mitochondria.

1 Supported by the Ministero della Ricerca Scientifica e Technologica (M.U.R.S.T., 60% and 40% Funds).






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