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A tRNA Val(GAC) gene of chloroplast origin in sunflower mitochondria is not transcribed |
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| Authors: | Luigi R Ceci Adolfo Saiardi Luisa Siculella Carla Quagliariello |
| Institution: | (1) Centro Studi Mitocondri e Metabolismo Energetico-C.N.R., Via Corato 17, 70059 Trani, Italy;(2) Dipartimento di Biologia Cellulare, Università della Calabria, 87030 Arcavacata di Rende;(3) Dipartimento di Biologia, Università degli Studi, via Monteroni, 73100 Lecce, Italy |
| Abstract: | A tRNAVal (GAC) gene is located in opposite orientation 552 nucleotides (nt) down-stream of the cytochrome oxidase subunit III (coxIII) gene in sunflower mitochondria. The comparison with the homologous chloroplast DNA revealed that the tRNAVal gene is part of a 417 nucleotides DNA insertion of chloroplast origin in the mitochondrial genome. No tRNAVal is encoded in monocot mitochondrial DNA (mtDNA), whereas two tRNAVal species are coded for by potato mtDNA. The mitochondrial genomes of different plant species thus seem to encode unique sets of tRNAs and must thus be competent in importing the missing differing sets of tRNAs. |
| Keywords: | sunflower mitochondrial DNA chloroplast DNA DNA insertion tRNAVal(GAC) |
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