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Two birds with one stone: genes that encode products targeted to two or more compartments
Authors:Small  Ian  Wintz  Henri  Akashi  Kinya  Mireau  Hakim
Institution:(1) Station de Génétique et Amélioration des Plantes, INRA, Route de St-Cyr, 78026 Versailles Cedex, France (author for correspondence;(2) Institut de Biologie Moléculaire des Plantes, 12 Rue du Général Zimmer, 67084 Strasbourg Cedex, France;(3) Present address: Section of Genetics and Development, Cornell University, Biotechnology Building, Ithaca, NY 14853, USA
Abstract:Eukaryotic cells are divided into multiple membrane-bound compartments, all of which contain proteins. A large subset of these proteins perform functions that are required in more than one compartment. Although in most cases proteins carrying out the same function in different compartments are encoded by different genes, this is not always true. Numerous examples have now been found where a single gene encodes proteins (or RNAs) found in two (or more) cell organelles or membrane systems. Some particularly clear examples come from protein synthesis itself: plant cells contain three protein-synthesizing compartments, the cytosol, the mitochondrial matrix and the plastid stroma. All three compartments thus require tRNAs and aminoacyl-tRNA synthetases. Some mitochondrial tRNAs and their aminoacyl-tRNA synthetases are identical to their cytosolic counterparts and they are encoded by the same genes. Similarly, some mitochondrial and plastid aminoacyl-tRNA synthetases are encoded by the same nuclear genes. The various ways in which differentially targeted products can be generated from single genes is discussed.
Keywords:protein import  tRNA import  organelles  dual-targeting
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