Sequence dependence of tRNA(Gly) import into tobacco mitochondria |
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Authors: | Salinas Thalia Schaeffer Cécile Maréchal-Drouard Laurence Duchêne Anne-Marie |
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Institution: | Institut de Biologie Moléculaire des Plantes, UPR du CNRS no. 2357, Université Louis Pasteur, 12, rue du Général Zimmer, 67000 Strasbourg, France. |
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Abstract: | Plant mitochondrial genomes lack a number of tRNA genes and the corresponding tRNAs, which are nuclear-encoded, are imported from the cytosol. We show that specific import of tRNA(Gly) isoacceptors occurs in tobacco mitochondria: tRNA(Gly)(UCC) and tRNA(Gly)(CCC) are cytosolic and mitochondrial, while tRNA(Gly)(GCC) is found only in the cytosol. Exchange of sequences between tRNA(Gly)(UCC) and tRNA(Gly)(GCC) shows that the anticodon and D-domain are essential for tRNA(Gly)(UCC) import. However the reverse mutations in tRNA(Gly)(GCC) are not sufficient to promote its import into tobacco mitochondria. |
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