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A more recent version of this article appeared on September 1, 2003
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Submitted on February 7, 2003
Revised on May 12, 2003
Accepted on May 12, 2003
1 Laboratoire de Génétique Moléculaire, (UMR CNRS 8541): Ecole Normale Supérieure, 46 Rue d'Ulm 75230 Paris Cedex 05, France
2 Centre de Génétique Moléculaire du CNRS, Avenue de la Terrasse 91198 Gif-sur-Yvette, France
* Corresponding author. E-mail address: corral{at}biologie.ens.fr.
* Corresponding author. E-mail address: corral{at}biologie.ens.fr.
We recently demonstrated, using yeast DNA microarrays, that mRNAs of polysomes that coisolate with mitochondria code for a subset of mitochondrial proteins. The majority of these mRNAs encode proteins of prokaryotic origin. Here, we show that a similar association occurs between polysomes and mitochondria in human cells. To determine whether mRNA transport machinery is conserved from yeast to human cells, we examined the subcellular localization of human OXA1 mRNA in yeast. Oxa1p is a key component in the biogenesis of mitochondrial inner membrane, and is conserved from bacteria to eucaryotic organelles. The expression of human OXA1 cDNA partially restores the respiratory capacity of yeast oxa1- cells. In this study, we demonstrate that: 1) OXA1 mRNAs are remarkably enriched in mitochondrion-bound polysomes purified from yeast and human cells, 2) The presence of the human OXA1 3'UTR is required for the function of the human Oxa1p inside yeast mitochondria. 3) The accurate sorting of the human OXA1 mRNA to the vicinity of yeast mitochondria is due to the recognition by yeast proteins of the human 3'UTR. Therefore, it appears that the recognition mechanism of OXA1 3'UTR is conserved throughout evolution and is necessary for Oxa1p function.
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