Abstract
Mitochondria are considered as the powerhouse of eukaryotic cells. They host several central metabolic processes fueling the oxidative phosphorylation pathway (OXPHOS) that produces ATP from its precursors ADP and inorganic phosphate Pi (PPi). The respiratory chain complexes responsible for the OXPHOS pathway are formed from complementary sets of protein subunits encoded by the nuclear genome and the mitochondrial genome, respectively. The expression of the mitochondrial genome requires a specific and fully active translation machinery from which aminoacyl-tRNA synthetases (aaRSs) are key actors. Whilst the macromolecules involved in mammalian mitochondrial translation have been under investigation for many years, there has been an explosion of interest in human mitochondrial aaRSs (mt-aaRSs) since the discovery of a large (and growing) number of mutations in these genes that are linked to a variety of neurodegenerative disorders. Herein we will review the present knowledge on mt-aaRSs in terms of their biogenesis, their connection to mitochondrial respiration, i.e., the respiratory chain (RC) complexes, and to the mitochondrial translation machinery. The pathology-related mutations detected so far are described, with special attention given to their impact on mt-aaRSs biogenesis, functioning, and/or subsequent activities. The collected data to date shed light on the diverse routes that are linking primary molecular possible impact of a mutation to its phenotypic expression. It is envisioned that a variety of mechanisms, inside and outside the translation machinery, would play a role on the heterogeneous manifestations of mitochondrial disorders.
Note: Rigorously, amino acid conversion of a given mutation should be preceded by the letter “p.” to indicate that the protein level is considered. For example, the 172C > G nucleotide change engenders the p.R58G mutation in DARS2 (referencing the gene) or mt-AspRS (referencing the protein). For sake of simplicity, the “p.” is omitted throughout the chapter.
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Abbreviations
- AaRS:
-
Aminoacyl-tRNA synthetase (specificity is indicated by the name of the amino acid (abbreviated in a three-letter code) transferred to the cognate tRNA. As an example, AspRS stands for aspartyl-tRNA synthetase)
- mt:
-
Mitochondrial
- MTS:
-
Mitochondrial targeting sequence
- RC:
-
Respiratory chain
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Acknowledgements
We thank Redmond Smyth for many stylistic improvements of the manuscript. Our work is supported by Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UdS), and the French National Program “Investissement d’Avenir” (Labex MitCross), administered by the “Agence National de la Recherche,” and referenced ANR-10-IDEX-002-02. The ADIRAL association is acknowledged. HS was supported by Région Alsace, Université de Strasbourg, Association Française contre les Mytopathies (AFM) and Fondation des Treilles.
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Schwenzer, H., Zoll, J., Florentz, C., Sissler, M. (2013). Pathogenic Implications of Human Mitochondrial Aminoacyl-tRNA Synthetases. In: Kim, S. (eds) Aminoacyl-tRNA Synthetases in Biology and Medicine. Topics in Current Chemistry, vol 344. Springer, Dordrecht. https://doi.org/10.1007/128_2013_457
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