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By definition, cytosolic aminoacyl-tRNA synthetases (aaRSs) should be restricted to the cytosol of eukaryotic cells where they supply translating ribosomes with their aminoacyl-tRNA substrates. However, it has been shown that other translationally-active compartments like mitochondria and plastids can simultaneously contain the cytosolic aaRS and its corresponding organellar ortholog suggesting that...
In eukaryotic cells, oxidative phosphorylation involves multisubunit complexes of mixed genetic origin. Assembling these complexes requires an organelle-independent synchronizing system for the proper expression of nuclear and mitochondrial genes. Here we show that proper expression of the F1FO ATP synthase (complex V) depends on a cytosolic complex (AME) made of two aminoacyl-tRNA synthetases (cERS...
Aminoacyl-tRNA synthetases (aaRSs) are ubiquitous and ancient enzymes, mostly known for their essential role in generating aminoacylated tRNAs. During the last two decades, many aaRSs have been found to perform additional and equally crucial tasks outside translation. In metazoans, aaRSs have been shown to assemble, together with non-enzymatic assembly proteins called aaRSs-interacting multifunctional...
Mitochondria originate from the α-proteobacterial domain of life. Since this unique event occurred, mitochondrial genomes of protozoans, fungi, plants and metazoans have highly derived and diverged away from the common ancestral DNA. These resulting genomes highly differ from one another, but all present-day mitochondrial DNAs have a very reduced coding capacity. Strikingly however, ATP production...
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