Abstract
Phylogenetic studies of the yeast mitochondrial proteome have shown a complex evolutionary scenario, in which proteins of bacterial origin form complexes with proteins of eukaryotic origin. Exciting new results from whole-genome microarray studies of subcellular mRNA localizations have shown that mRNAs that are of putative bacterial origin are mainly translated on polysomes that are associated with the mitochondrion, whereas those of eukaryotic origin are generally translated on free cytosolic polysomes. Understanding these newly discovered relationships promises insights into old questions about organelle origins and mRNA localization in the eukaryotic cell.
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