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Marie Sissler, Ligia Elena González-Serrano, Eric Westhof
Dysfunctions in mitochondria - the powerhouses of the cell - lead to several human pathologies. Because mitochondria integrate nuclear and mitochondrial genetic systems, they are richly intertwined with cellular activities. The nucleus-encoded mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs) are key components of the mitochondrial translation apparatus. Mutations in these enzymes predominantly affect the central nervous system (CNS) but also target other organs. Comparable mutations in mt-aaRSs can lead to vastly diverse diseases, occurring at different stages in life, and within different tissues; this represents a confounding issue...
July 14, 2017: Trends in Molecular Medicine
Luc Moulinier, Raymond Ripp, Gaston Castillo, Olivier Poch, Marie Sissler
Numerous mutations in each of the mitochondrial aminoacyl-tRNA synthetases (aaRSs) have been implicated in human diseases. The mutations are autosomal and recessive and lead mainly to neurological disorders, although with pleiotropic effects. The processes and interactions that drive the etiology of the disorders associated with mitochondrial aaRSs (mt-aaRSs) are far from understood. The complexity of the clinical, genetic, and structural data requires concerted, interdisciplinary efforts to understand the molecular biology of these disorders...
October 2017: Human Mutation
Christine Carapito, Lauriane Kuhn, Loukmane Karim, Magali Rompais, Thierry Rabilloud, Hagen Schwenzer, Marie Sissler
Human mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs) are encoded in the nucleus, synthesized in the cytosol and targeted for importation into mitochondria by a N-terminal mitochondrial targeting sequence. This targeting sequence is presumably cleaved upon entry into the mitochondria, following a process still not fully deciphered in human, despite essential roles for the mitochondrial biogenesis. Maturation processes are indeed essential both for the release of a functional enzyme and to route correctly the protein within mitochondria...
January 15, 2017: Methods: a Companion to Methods in Enzymology
Marie Sissler
No abstract text is available yet for this article.
September 2016: BioEssays: News and Reviews in Molecular, Cellular and Developmental Biology
Claude Sauter, Bernard Lorber, Agnès Gaudry, Loukmane Karim, Hagen Schwenzer, Frank Wien, Pierre Roblin, Catherine Florentz, Marie Sissler
Mutations in human mitochondrial aminoacyl-tRNA synthetases are associated with a variety of neurodegenerative disorders. The effects of these mutations on the structure and function of the enzymes remain to be established. Here, we investigate six mutants of the aspartyl-tRNA synthetase correlated with leukoencephalopathies. Our integrated strategy, combining an ensemble of biochemical and biophysical approaches, reveals that mutants are diversely affected with respect to their solubility in cellular extracts and stability in solution, but not in architecture...
2015: Scientific Reports
Mariella Simon, Elodie M Richard, Xinjian Wang, Mohsin Shahzad, Vincent H Huang, Tanveer A Qaiser, Prasanth Potluri, Sarah E Mahl, Antonio Davila, Sabiha Nazli, Saege Hancock, Margret Yu, Jay Gargus, Richard Chang, Nada Al-Sheqaih, William G Newman, Jose Abdenur, Arnold Starr, Rashmi Hegde, Thomas Dorn, Anke Busch, Eddie Park, Jie Wu, Hagen Schwenzer, Adrian Flierl, Catherine Florentz, Marie Sissler, Shaheen N Khan, Ronghua Li, Min-Xin Guan, Thomas B Friedman, Doris K Wu, Vincent Procaccio, Sheikh Riazuddin, Douglas C Wallace, Zubair M Ahmed, Taosheng Huang, Saima Riazuddin
Here we demonstrate association of variants in the mitochondrial asparaginyl-tRNA synthetase NARS2 with human hearing loss and Leigh syndrome. A homozygous missense mutation ([c.637G>T; p.Val213Phe]) is the underlying cause of nonsyndromic hearing loss (DFNB94) and compound heterozygous mutations ([c.969T>A; p.Tyr323*] + [c.1142A>G; p.Asn381Ser]) result in mitochondrial respiratory chain deficiency and Leigh syndrome, which is a neurodegenerative disease characterized by symmetric, bilateral lesions in the basal ganglia, thalamus, and brain stem...
March 2015: PLoS Genetics
Jonathan L Huot, Ludovic Enkler, Cyrille Megel, Loukmane Karim, Daphné Laporte, Hubert D Becker, Anne-Marie Duchêne, Marie Sissler, Laurence Maréchal-Drouard
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 coupled to electron transport and translation of mitochondrial proteins are the two common functions retained in all mitochondrial DNAs...
May 2014: Biochimie
Hagen Schwenzer, Gert C Scheper, Nathalie Zorn, Luc Moulinier, Agnès Gaudry, Emmanuelle Leize, Franck Martin, Catherine Florentz, Olivier Poch, Marie Sissler
Mammalian mitochondrial aminoacyl-tRNA synthetases are nuclear-encoded enzymes that are essential for mitochondrial protein synthesis. Due to an endosymbiotic origin of the mitochondria, many of them share structural domains with homologous bacterial enzymes of same specificity. This is also the case for human mitochondrial aspartyl-tRNA synthetase (AspRS) that shares the so-called bacterial insertion domain with bacterial homologs. The function of this domain in the mitochondrial proteins is unclear. Here, we show by bioinformatic analyses that the sequences coding for the bacterial insertion domain are less conserved in opisthokont and protist than in bacteria and viridiplantae...
May 2014: Biochimie
Hagen Schwenzer, Joffrey Zoll, Catherine Florentz, Marie Sissler
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...
2014: Topics in Current Chemistry
Anne Neuenfeldt, Bernard Lorber, Eric Ennifar, Agnès Gaudry, Claude Sauter, Marie Sissler, Catherine Florentz
In the mammalian mitochondrial translation apparatus, the proteins and their partner RNAs are coded by two genomes. The proteins are nuclear-encoded and resemble their homologs, whereas the RNAs coming from the rapidly evolving mitochondrial genome have lost critical structural information. This raises the question of molecular adaptation of these proteins to their peculiar partner RNAs. The crystal structure of the homodimeric bacterial-type human mitochondrial aspartyl-tRNA synthetase (DRS) confirmed a 3D architecture close to that of Escherichia coli DRS...
February 1, 2013: Nucleic Acids Research
Laura van Berge, Josta Kevenaar, Emiel Polder, Agnès Gaudry, Catherine Florentz, Marie Sissler, Marjo S van der Knaap, Gert C Scheper
The autosomal recessive white matter disorder LBSL (leukoencephalopathy with brain stem and spinal cord involvement and lactate elevation) is caused by mutations in DARS2, coding for mtAspRS (mitochondrial aspartyl-tRNA synthetase). Generally, patients are compound heterozygous for mutations in DARS2. Many different mutations have been identified in patients, including several missense mutations. In the present study, we have examined the effects of missense mutations found in LBSL patients on the expression, enzyme activity, localization and dimerization of mtAspRS, which is important for understanding the cellular defect underlying the pathogenesis of the disease...
March 1, 2013: Biochemical Journal
Agnès Gaudry, Bernard Lorber, Anne Neuenfeldt, Claude Sauter, Catherine Florentz, Marie Sissler
Mitochondrial aminoacyl-tRNA synthetases are key enzymes in translation. They are encoded by the nuclear genome, synthesized as precursors in the cytosol and imported. Most are matured by cleavage of their N-terminal targeting sequence. The poor expression of mature proteins in prokaryotic systems, along with their low solubility and stability after purification are major obstacles for biophysical and crystallographic studies. The purpose of the present work was to analyze the influence of additives on a slightly soluble aspartyl-tRNA synthetase and of the N-terminal sequence of the protein on its expression and solubility...
September 2012: Protein Engineering, Design & Selection: PEDS
Aurélie Fender, Agnès Gaudry, Frank Jühling, Marie Sissler, Catherine Florentz
Many mammalian mitochondrial aminoacyl-tRNA synthetases are of bacterial-type and share structural domains with homologous bacterial enzymes of the same specificity. Despite this high similarity, synthetases from bacteria are known for their inability to aminoacylate mitochondrial tRNAs, while mitochondrial enzymes do aminoacylate bacterial tRNAs. Here, the reasons for non-aminoacylation by a bacterial enzyme of a mitochondrial tRNA have been explored. A mutagenic analysis performed on in vitro transcribed human mitochondrial tRNA(Asp) variants tested for their ability to become aspartylated by Escherichia coli aspartyl-tRNA synthetase, reveals that full conversion cannot be achieved on the basis of the currently established tRNA/synthetase recognition rules...
May 2012: Biochimie
Marie Messmer, Catherine Florentz, Hagen Schwenzer, Gert C Scheper, Marjo S van der Knaap, Laurence Maréchal-Drouard, Marie Sissler
Mutations in the nuclear gene coding for the mitochondrial aspartyl-tRNA synthetase, a key enzyme for mitochondrial translation, are correlated with leukoencephalopathy. A Ser⁴⁵ to Gly⁴⁵ mutation is located in the predicted targeting signal of the protein. We demonstrate in the present study, by in vivo and in vitro approaches, that this pathology-related mutation impairs the import process across mitochondrial membranes.
February 1, 2011: Biochemical Journal
Marie Messmer, Joern Pütz, Takeo Suzuki, Tsutomu Suzuki, Claude Sauter, Marie Sissler, Florentz Catherine
Primary and secondary structures of mammalian mitochondrial (mt) tRNAs are divergent from canonical tRNA structures due to highly skewed nucleotide content and large size variability of D- and T-loops. The nonconservation of nucleotides involved in the expected network of tertiary interactions calls into question the rules governing a functional L-shaped three-dimensional (3D) structure. Here, we report the solution structure of human mt-tRNA(Asp) in its native post-transcriptionally modified form and as an in vitro transcript...
November 2009: Nucleic Acids Research
Marie Messmer, Sébastien P Blais, Christian Balg, Robert Chênevert, Luc Grenier, Patrick Lagüe, Claude Sauter, Marie Sissler, Richard Giegé, Jacques Lapointe, Catherine Florentz
Human mitochondrial aminoacyl-tRNA synthetases (mt-aaRSs), the enzymes which esterify tRNAs with the cognate specific amino acid, form mainly a different set of proteins than those involved in the cytosolic translation machinery. Many of the mt-aaRSs are of bacterial-type in regard of sequence and modular structural organization. However, the few enzymes investigated so far do have peculiar biochemical and enzymological properties such as decreased solubility, decreased specific activity and enlarged spectra of substrate tRNAs (of same specificity but from various organisms and kingdoms), as compared to bacterial aaRSs...
May 2009: Biochimie
Marie Sissler, Bernard Lorber, Marie Messmer, André Schaller, Joern Pütz, Catherine Florentz
The mammalian mitochondrial (mt) genome codes for only 13 proteins, which are essential components in the process of oxidative phosphorylation of ADP into ATP. Synthesis of these proteins relies on a proper mt translation machinery. While 22 tRNAs and 2 rRNAs are also coded by the mt genome, all other factors including the set of aminoacyl-tRNA synthetases (aaRSs) are encoded in the nucleus and imported. Investigation of mammalian mt aminoacylation systems (and mt translation in general) gains more and more interest not only in regard of evolutionary considerations but also with respect to the growing number of diseases linked to mutations in the genes of either mt-tRNAs, synthetases or other factors...
February 2008: Methods: a Companion to Methods in Enzymology
Joern Pütz, Bruno Dupuis, Marie Sissler, Catherine Florentz
Mamit-tRNA (, a database for mammalian mitochondrial genomes, has been developed for deciphering structural features of mammalian mitochondrial tRNAs and as a helpful tool in the frame of human diseases linked to point mutations in mitochondrial tRNA genes. To accommodate the rapid growing availability of fully sequenced mammalian mitochondrial genomes, Mamit-tRNA has implemented a relational database, and all annotated tRNA genes have been curated and aligned manually. System administrative tools have been integrated to improve efficiency and to allow real-time update (from GenBank Database at NCBI) of available mammalian mitochondrial genomes...
August 2007: RNA
Gert C Scheper, Thom van der Klok, Rob J van Andel, Carola G M van Berkel, Marie Sissler, Joél Smet, Tatjana I Muravina, Sergey V Serkov, Graziella Uziel, Marianna Bugiani, Raphael Schiffmann, Ingeborg Krägeloh-Mann, Jan A M Smeitink, Catherine Florentz, Rudy Van Coster, Jan C Pronk, Marjo S van der Knaap
Leukoencephalopathy with brain stem and spinal cord involvement and lactate elevation (LBSL) has recently been defined based on a highly characteristic constellation of abnormalities observed by magnetic resonance imaging and spectroscopy. LBSL is an autosomal recessive disease, most often manifesting in early childhood. Affected individuals develop slowly progressive cerebellar ataxia, spasticity and dorsal column dysfunction, sometimes with a mild cognitive deficit or decline. We performed linkage mapping with microsatellite markers in LBSL families and found a candidate region on chromosome 1, which we narrowed by means of shared haplotypes...
April 2007: Nature Genetics
Aurélie Fender, Claude Sauter, Marie Messmer, Joern Pütz, Richard Giegé, Catherine Florentz, Marie Sissler
In mammalian mitochondria the translational machinery is of dual origin with tRNAs encoded by a simplified and rapidly evolving mitochondrial (mt) genome and aminoacyl-tRNA synthetases (aaRS) coded by the nuclear genome, and imported. Mt-tRNAs are atypical with biased sequences, size variations in loops and stems, and absence of residues forming classical tertiary interactions, whereas synthetases appear typical. This raises questions about identity elements in mt-tRNAs and adaptation of their cognate mt-aaRSs...
June 9, 2006: Journal of Biological Chemistry
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