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Accueil > Départements > Biologie Cellulaire > Nathalie BONNEFOY : Biogenèse et fonctionnement des complexes OXPHOS mitochondriaux chez les levures et les mammifères

Publications de l’équipe


  • A. M. Hartley, N. Lukoyanova, Y. Zhang, A. Cabrera-Orefice, S. Arnold, B. Meunier, N. Pinotsis, et A. Maréchal, « Structure of yeast cytochrome c oxidase in a supercomplex with cytochrome bc1 », Nature Structural & Molecular Biology, vol. 26, nᵒ 1, p. 78-83, janv. 2019.
    Résumé : Cytochrome c oxidase (complex IV, CIV) is known in mammals to exist independently or in association with other respiratory proteins to form supercomplexes (SCs). In Saccharomyces cerevisiae, CIV is found solely in an SC with cytochrome bc1 (complex III, CIII). Here, we present the cryogenic electron microscopy (cryo-EM) structure of S. cerevisiae CIV in a III2IV2 SC at 3.3 Å resolution. While overall similarity to mammalian homologs is high, we found notable differences in the supernumerary subunits Cox26 and Cox13; the latter exhibits a unique arrangement that precludes CIV dimerization as seen in bovine. A conformational shift in the matrix domain of Cox5A-involved in allosteric inhibition by ATP-may arise from its association with CIII. The CIII-CIV arrangement highlights a conserved interaction interface of CIII, albeit one occupied by complex I in mammalian respirasomes. We discuss our findings in the context of the potential impact of SC formation on CIV regulation.
    Mots-clés : architecture, BIOCELL, BIOMIT, isoforms, kinetics, mechanisms, mitochondrial complex, phosphorylation, purification, respiration, subunit, system.

  • S. Jiang, C. Koolmeister, J. Misic, S. Siira, I. Kühl, E. S. Ramos, M. Miranda, M. Jiang, V. Posse, O. Lytovchenko, I. Atanassov, F. A. Schober, R. Wibom, K. Hultenby, D. Milenkovic, C. M. Gustafsson, A. Filipovska, et N. - G. Larsson, « TEFM regulates both transcription elongation and RNA processing in mitochondria », EMBO reports, vol. 20, nᵒ 6, p. e48101, avr. 2019.
    Résumé : Regulation of replication and expression of mitochondrial DNA (mtDNA) is essential for cellular energy conversion via oxidative phosphorylation. The mitochondrial transcription elongation factor (TEFM) has been proposed to regulate the switch between transcription termination for replication primer formation and processive, near genome-length transcription for mtDNA gene expression. Here, we report that Tefm is essential for mouse embryogenesis and that levels of promoter-distal mitochondrial transcripts are drastically reduced in conditional Tefm-knockout hearts. In contrast, the promoter-proximal transcripts are much increased in Tefm knockout mice, but they mostly terminate before the region where the switch from transcription to replication occurs, and consequently, de novo mtDNA replication is profoundly reduced. Unexpectedly, deep sequencing of RNA from Tefm knockouts revealed accumulation of unprocessed transcripts in addition to defective transcription elongation. Furthermore, a proximity-labeling (BioID) assay showed that TEFM interacts with multiple RNA processing factors. Our data demonstrate that TEFM acts as a general transcription elongation factor, necessary for both gene transcription and replication primer formation, and loss of TEFM affects RNA processing in mammalian mitochondria.
    Mots-clés : BIOCELL, BIOMIT, dna-replication, granules, hybrid, identification, maintenance, mtDNA replication, polymerase, ribosomal-protein l12, RNA processing, site, stability, transcription elongation, translation.

  • K. Keatley, S. Stromei-Cleroux, T. Wiltshire, N. Rajala, G. Burton, W. V. Holt, D. T. J. Littlewood, A. G. Briscoe, J. Jung, K. Ashkan, S. J. Heales, G. J. Pilkington, B. Meunier, J. E. McGeehan, I. P. Hargreaves, et R. E. McGeehan, « Integrated Approach Reveals Role of Mitochondrial Germ-Line Mutation F18L in Respiratory Chain, Oxidative Alterations, Drug Sensitivity, and Patient Prognosis in Glioblastoma », International Journal of Molecular Sciences, vol. 20, nᵒ 13, juill. 2019.
    Résumé : Glioblastoma is the most common and malignant primary brain tumour in adults, with a dismal prognosis. This is partly due to considerable inter- and intra-tumour heterogeneity. Changes in the cellular energy-producing mitochondrial respiratory chain complex (MRC) activities are a hallmark of glioblastoma relative to the normal brain, and associate with differential survival outcomes. Targeting MRC complexes with drugs can also facilitate anti-glioblastoma activity. Whether mutations in the mitochondrial DNA (mtDNA) that encode several components of the MRC contribute to these phenomena remains underexplored. We identified a germ-line mtDNA mutation (m. 14798T > C), enriched in glioblastoma relative to healthy controls, that causes an amino acid substitution F18L within the core mtDNA-encoded cytochrome b subunit of MRC complex III. F18L is predicted to alter corresponding complex III activity, and sensitivity to complex III-targeting drugs. This could in turn alter reactive oxygen species (ROS) production, cell behaviour and, consequently, patient outcomes. Here we show that, despite a heterogeneous mitochondrial background in adult glioblastoma patient biopsy-derived cell cultures, the F18L substitution associates with alterations in individual MRC complex activities, in particular a 75% increase in MRC complex II_III activity, and a 34% reduction in CoQ10, the natural substrate for MRC complex III, levels. Downstream characterisation of an F18L-carrier revealed an 87% increase in intra-cellular ROS, an altered cellular distribution of mitochondrial-specific ROS, and a 64% increased sensitivity to clomipramine, a repurposed MRC complex III-targeting drug. In patients, F18L-carriers that received the current standard of care treatment had a poorer prognosis than non-carriers (373 days vs. 415 days, respectively). Single germ-line mitochondrial mutations could predispose individuals to differential prognoses, and sensitivity to mitochondrial targeted drugs. Thus, F18L, which is present in blood could serve as a useful non-invasive biomarker for the stratification of patients into prognostically relevant groups, one of which requires a lower dose of clomipramine to achieve clinical effect, thus minimising side-effects.
    Mots-clés : BIOCELL, BIOMIT, clomipramine, CoQ10, glioblastoma, mitochondria, mtDNA, mutation, OXPHOS, prognosis, ROS.
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  • A. Malkamäki, B. Meunier, M. Reidelbach, P. R. Rich, et V. Sharma, « The H channel is not a proton transfer path in yeast cytochrome c oxidase », Biochimica Et Biophysica Acta. Bioenergetics, vol. 1860, nᵒ 9, p. 717-723, juill. 2019.
    Résumé : Cytochrome c oxidases (CcOs) in the respiratory chains of mitochondria and bacteria are primary consumers of molecular oxygen, converting it to water with the concomitant pumping of protons across the membrane to establish a proton electrochemical gradient. Despite a relatively well understood proton pumping mechanism of bacterial CcOs, the role of the H channel in mitochondrial forms of CcO remains debated. Here, we used site-directed mutagenesis to modify a central residue of the lower span of the H channel, Q413, in the genetically tractable yeast Saccharomyces cerevisiae. Exchange of Q413 to several different amino acids showed no effect on rates and efficiencies of respiratory cell growth, and redox potential measurements indicated minimal electrostatic interaction between the 413 locus and the nearest redox active component heme a. These findings clearly exclude a primary role of this section of the H channel in proton pumping in yeast CcO. In agreement with the experimental data, atomistic molecular dynamics simulations and continuum electrostatic calculations on wildtype and mutant yeast CcOs highlight potential bottlenecks in proton transfer through this route. Our data highlight the preference for neutral residues in the 413 locus, precluding sufficient hydration for formation of a proton conducting wire.
    Mots-clés : BIOCELL, BIOMIT, Cell respiration, Electron transfer, MD simulations, Mitochondria, Proton pumping.

  • P. Mounkoro, T. Michel, R. Benhachemi, G. Surpateanu, B. I. Iorga, N. Fisher, et B. Meunier, « Mitochondrial complex III Qi -site inhibitor resistance mutations found in laboratory selected mutants and field isolates », Pest Management Science, vol. 75, nᵒ 8, p. 2107-2114, août 2019.
    Résumé : BACKGROUND: Complex III inhibitors targeting the Qi -site have been known for decades; some are used or being developed as antimicrobial compounds. Target site resistance mutations have been reported in laboratory-selected mutants and in field isolates. Here, we present a brief overview of mutations found in laboratory-selected resistant mutants. We also provide a study of mutations observed in field isolates of Plasmopara viticola, in particular the ametoctradin resistance substitution, S34L that we analysed in the yeast model. RESULTS: A survey of laboratory mutants showed that resistance could be caused by a large number of substitutions in the Qi -site. Four residues seemed key in term of resistance: N31, G37, L198 and K228. Using yeast, we analysed the effect of the ametoctradin resistance substitution S34L reported in field isolates of P. viticola. We showed that S34L caused a high level of resistance combined with a loss of complex III activity and growth competence. CONCLUSION: Use of single site Qi -site inhibitors is expected to result in the selection of resistant mutants. However, if the substitution is associated with a fitness penalty, as may be the case with S34L, resistance development might not be an insuperable obstacle, although careful monitoring is required. © 2018 Society of Chemical Industry.
    Mots-clés : bc1 complex, BIOCELL, BIOMIT, fungicides, QiI, resistance, target site mutation, yeast model.

  • P. Mounkoro, T. Michel, S. Blandin, M. - P. Golinelli-Cohen, E. Davioud-Charvet, et B. Meunier, « Investigating the mode of action of the redox-active antimalarial drug plasmodione using the yeast model », Free Radical Biology & Medicine, vol. 141, p. 269-278, juin 2019.
    Résumé : Malaria is caused by protozoan parasites and remains a major public health issue in subtropical areas. Plasmodione (3-[4-(trifluoromethyl)benzyl]-menadione) is a novel early lead compound displaying fast-acting antimalarial activity. Treatment with this redox active compound disrupts the redox balance of parasite-infected red blood cells. In vitro, the benzoyl analogue of plasmodione can act as a subversive substrate of the parasite flavoprotein NADPH-dependent glutathione reductase, initiating a redox cycling process producing ROS. Whether this is also true in vivo remains to be investigated. Here, we used the yeast model to investigate the mode of action of plasmodione and uncover enzymes and pathways involved in its activity. We showed that plasmodione is a potent inhibitor of yeast respiratory growth, that in drug-treated cells, the ROS-sensitive aconitase was impaired and that cells with a lower oxidative stress defence were highly sensitive to the drug, indicating that plasmodione may act via an oxidative stress. We found that the mitochondrial respiratory chain flavoprotein NADH-dehydrogenases play a key role in plasmodione activity. Plasmodione and metabolites act as substrates of these enzymes, the reaction resulting in ROS production. This in turn would damage ROS-sensitive enzymes leading to growth arrest. Our data further suggest that plasmodione is a pro-drug whose activity is mainly mediated by its benzhydrol and benzoyl metabolites. Our results in yeast are coherent with existing data obtained in vitro and in Plasmodium falciparum, and provide additional hypotheses that should be investigated in parasites.
    Mots-clés : Antimalarial drug, BIOCELL, BIOMIT, Drug mode of action, Mitochondrial respiratory chain, Oxidative stress, Yeast model.

  • E. S. Ramos, E. Motori, C. Brüser, I. Kühl, A. Yeroslaviz, B. Ruzzenente, J. H. K. Kauppila, J. D. Busch, K. Hultenby, B. H. Habermann, S. Jakobs, N. - G. Larsson, et A. Mourier, « Mitochondrial fusion is required for regulation of mitochondrial DNA replication », PLOS Genetics, vol. 15, nᵒ 6, p. e1008085, 2019.
    Résumé : Mitochondrial dynamics is an essential physiological process controlling mitochondrial content mixing and mobility to ensure proper function and localization of mitochondria at intracellular sites of high-energy demand. Intriguingly, for yet unknown reasons, severe impairment of mitochondrial fusion drastically affects mtDNA copy number. To decipher the link between mitochondrial dynamics and mtDNA maintenance, we studied mouse embryonic fibroblasts (MEFs) and mouse cardiomyocytes with disruption of mitochondrial fusion. Super-resolution microscopy revealed that loss of outer mitochondrial membrane (OMM) fusion, but not inner mitochondrial membrane (IMM) fusion, leads to nucleoid clustering. Remarkably, fluorescence in situ hybridization (FISH), bromouridine labeling in MEFs and assessment of mitochondrial transcription in tissue homogenates revealed that abolished OMM fusion does not affect transcription. Furthermore, the profound mtDNA depletion in mouse hearts lacking OMM fusion is not caused by defective integrity or increased mutagenesis of mtDNA, but instead we show that mitochondrial fusion is necessary to maintain the stoichiometry of the protein components of the mtDNA replisome. OMM fusion is necessary for proliferating MEFs to recover from mtDNA depletion and for the marked increase of mtDNA copy number during postnatal heart development. Our findings thus link OMM fusion to replication and distribution of mtDNA.
    Mots-clés : BIOCELL, BIOMIT, Confocal microscopy, DNA replication, Heart, Membrane fusion, Mitochondria, Mitochondrial DNA, Point mutation, Southern blot.
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  • A. Dreinert, A. Wolf, T. Mentzel, B. Meunier, et M. Fehr, « The cytochrome bc1 complex inhibitor Ametoctradin has an unusual binding mode », Biochimica et Biophysica Acta (BBA) - Bioenergetics, vol. 1859, nᵒ 8, p. 567-576, avr. 2018.
    Résumé : Ametoctradin is an agricultural fungicide that selectively inhibits the cytochrome bc1 complex of oomycetes. Previous spectrophotometric studies using the purified cytochrome bc1 complex from Pythium sp. showed that Ametoctradin binds to the Qo-site of the enzyme. However, as modeling studies suggested a binding mode like that of the substrate ubiquinol, the possibility for a dual Qo- and Qi-site binding mode was left open. In this work, binding studies and enzyme assays with mitochondrial membrane preparations from Pythium sp. and an S. cerevisiae strain with a modified Qi-site were used to investigate further the binding mode of Ametoctradin. The results obtained argue that the compound could bind to both the Qo- and Qi-sites of the cytochrome bc1 complex and that its position or binding pose in the Qi-site differs from that of Cyazofamid and Amisulbrom, the two Qi-site-targeting, anti-oomycetes compounds. Furthermore, the data support the argument that Ametoctradin prefers binding to the reduced cytochrome bc1 complex. Thus, Ametoctradin has an unusual binding mode and further studies with this compound may offer the opportunity to better understand the catalytic cycle of the cytochrome bc1 complex.
    Mots-clés : Ametoctradin, Amisulbrom, BIOCELL, BIOMIT, Cyazofamid, Cytochrome bc(1) complex, Initium, Oomycetes, Respiration inhibitor, Respiratory complex III.

  • A. Maréchal, A. M. Hartley, T. P. Warelow, B. Meunier, et P. R. Rich, « Comparison of redox and ligand binding behaviour of yeast and bovine cytochrome c oxidases using FTIR spectroscopy », Biochimica et Biophysica Acta (BBA) - Bioenergetics, mai 2018.
    Résumé : Redox and CO photolysis FTIR spectra of yeast cytochrome c oxidase WT and mutants are compared to those from bovine and P. denitrificans CcOs in order to establish common functional features. All display changes that can be assigned to their E242 (bovine numbering) equivalent and to weakly H-bonded water molecules. The additional redox-sensitive band reported at 1736 cm-1 in bovine CcO and previously assigned to D51 is absent from yeast CcO and couldn't be restored by introduction of a D residue at the equivalent position of the yeast protein. Redox spectra of yeast CcO also show much smaller changes in the amide I region, which may relate to structural differences in the region around D51 and the subunit I/II interface.
    Mots-clés : BIOCELL, BIOMIT, Carboxyl groups, Cytochrome c oxidase, Infrared spectroscopy, Mitochondria, Oxidoreduction, Site-directed mutagenesis.

  • D. Naquin, C. Panozzo, G. Dujardin, E. van Dijk, Y. D'Aubenton-Carafa, et C. Thermes, « Complete Sequence of the Intronless Mitochondrial Genome of the Saccharomyces cerevisiae Strain CW252 », Microbiology Resource Announcements, vol. 6, nᵒ 17, p. UNSP e00219-18, avr. 2018.
    Résumé : The mitochondrial genomes of Saccharomyces cerevisiae strains contain up to 13 introns. An intronless recombinant genome introduced into the nuclear background of S. cerevisiae strain W303 gave the S. cerevisiae CW252 strain, which is used to model mitochondrial respiratory pathologies. The complete sequence of this mitochondrial genome was obtained using a hybrid assembling methodology.
    Mots-clés : BIOCELL, BIOMIT, NGS, PF.

  • Z. Song, B. I. Iorga, P. Mounkoro, N. Fisher, et B. Meunier, « The antimalarial compound ELQ-400 is an unusual inhibitor of the <i>bc</i> <sub>1</sub> complex, targeting both <i>Q</i> <sub>o</sub> and <i>Q</i> <sub>i</sub> sites », FEBS Letters, mars 2018.


  • A. Glatigny, P. Gambette, A. Bourand-Plantefol, G. Dujardin, et M. - H. Mucchielli-Giorgi, « Development of an in silico method for the identification of subcomplexes involved in the biogenesis of multiprotein complexes in Saccharomyces cerevisiae », BMC systems biology, vol. 11, nᵒ 1, p. 67, juill. 2017.
    Résumé : BACKGROUND: Large sets of protein-protein interaction data coming either from biological experiments or predictive methods are available and can be combined to construct networks from which information about various cell processes can be extracted. We have developed an in silico approach based on these information to model the biogenesis of multiprotein complexes in the yeast Saccharomyces cerevisiae. RESULTS: Firstly, we have built three protein interaction networks by collecting the protein-protein interactions, which involved the subunits of three complexes, from different databases. The protein-protein interactions come from different kinds of biological experiments or are predicted. We have chosen the elongator and the mediator head complexes that are soluble and exhibit an architecture with subcomplexes that could be functional modules, and the mitochondrial bc 1 complex, which is an integral membrane complex and for which a late assembly subcomplex has been described. Secondly, by applying a clustering strategy to these networks, we were able to identify subcomplexes involved in the biogenesis of the complexes as well as the proteins interacting with each subcomplex. Thirdly, in order to validate our in silico results for the cytochrome bc1 complex we have analysed the physical interactions existing between three subunits by performing immunoprecipitation experiments in several genetic context. CONCLUSIONS: For the two soluble complexes (the elongator and mediator head), our model shows a strong clustering of subunits that belong to a known subcomplex or module. For the membrane bc 1 complex, our approach has suggested new interactions between subunits in the early steps of the assembly pathway that were experimentally confirmed. Scripts can be downloaded from the site: .
    Mots-clés : BIM, BIOCELL, BIOMIT, Complex assembly, DBG, Graph clustering, PPI network, Protein complex, Protein-protein interactions, Subcomplex.

  • C. H. He, D. S. Black, C. M. Allan, B. Meunier, S. Rahman, et C. F. Clarke, « Human COQ9 Rescues a coq9 Yeast Mutant by Enhancing Coenzyme Q Biosynthesis from 4-Hydroxybenzoic Acid and Stabilizing the CoQ-Synthome », Frontiers in Physiology, vol. 8, p. 463, 2017.
    Résumé : Coq9 is required for the stability of a mitochondrial multi-subunit complex, termed the CoQ-synthome, and the deamination step of Q intermediates that derive from para-aminobenzoic acid (pABA) in yeast. In human, mutations in the COQ9 gene cause neonatal-onset primary Q10 deficiency. In this study, we determined whether expression of human COQ9 could complement yeast coq9 point or null mutants. We found that expression of human COQ9 rescues the growth of the temperature-sensitive yeast mutant, coq9-ts19, on a non-fermentable carbon source and increases the content of Q6, by enhancing Q biosynthesis from 4-hydroxybenzoic acid (4HB). To study the mechanism for the rescue by human COQ9, we determined the steady-state levels of yeast Coq polypeptides in the mitochondria of the temperature-sensitive yeast coq9 mutant expressing human COQ9. We show that the expression of human COQ9 significantly increased steady-state levels of yeast Coq4, Coq6, Coq7, and Coq9 at permissive temperature. Human COQ9 polypeptide levels persisted at non-permissive temperature. A small amount of the human COQ9 co-purified with tagged Coq6, Coq6-CNAP, indicating that human COQ9 interacts with the yeast Q-biosynthetic complex. These findings suggest that human COQ9 rescues the yeast coq9 temperature-sensitive mutant by stabilizing the CoQ-synthome and increasing Q biosynthesis from 4HB. This finding provides a powerful approach to studying the function of human COQ9 using yeast as a model.
    Mots-clés : BIOCELL, BIOMIT, coenzyme Q, human homolog, Immunoprecipitation, mitochondrial metabolism, Saccharomyces cerevisiae, temperature-sensitive mutant.

  • O. Khalimonchuk, M. Bestwick, B. Meunier, T. C. Watts, et D. R. Winge, « Correction for Khalimonchuk et al., "Formation of the Redox Cofactor Centers during Cox1 Maturation in Yeast Cytochrome Oxidase" », Molecular and Cellular Biology, vol. 37, nᵒ 11, juin 2017.

  • I. Kühl, M. Miranda, I. Atanassov, I. Kuznetsova, Y. Hinze, A. Mourier, A. Filipovska, et N. - G. Larsson, « Transcriptomic and proteomic landscape of mitochondrial dysfunction reveals secondary coenzyme Q deficiency in mammals », eLife, vol. 6, nov. 2017.
    Résumé : Dysfunction of the oxidative phosphorylation (OXPHOS) system is a major cause of human disease and the cellular consequences are highly complex. Here, we present comparative analyses of mitochondrial proteomes, cellular transcriptomes and targeted metabolomics of five knockout mouse strains deficient in essential factors required for mitochondrial DNA gene expression, leading to OXPHOS dysfunction. Moreover, we describe sequential protein changes during post-natal development and progressive OXPHOS dysfunction in time course analyses in control mice and a middle lifespan knockout, respectively. Very unexpectedly, we identify a new response pathway to OXPHOS dysfunction in which the intra-mitochondrial synthesis of coenzyme Q (ubiquinone, Q) and Q levels are profoundly decreased, pointing towards novel possibilities for therapy. Our extensive omics analyses provide a high-quality resource of altered gene expression patterns under severe OXPHOS deficiency comparing several mouse models, that will deepen our understanding, open avenues for research and provide an important reference for diagnosis and treatment.
    Mots-clés : BIOCELL, biochemistry, BIOMIT, cell biology, Cellular transcriptome, Coenzyme Q biosynthesis, Mitochondrial gene expression, Mitoproteome, mouse, One-carbon pathway, OXPHOS dysfunction.

  • C. Panozzo, A. Laleve, D. Tribouillard-Tanvier, J. Ostojić, C. Sellem, G. Friocourt, A. Bourand-Plantefol, A. Burg, A. Delahodde, M. Blondel, et G. Dujardin, « Chemicals or mutations that target mitochondrial translation can rescue the respiratory deficiency of yeast bcs1 mutants », Biochimica Et Biophysica Acta, sept. 2017.
    Résumé : Bcs1p is a chaperone that is required for the incorporation of the Rieske subunit within complex III of the mitochondrial respiratory chain. Mutations in the human gene BCS1L (BCS1-like) are the most frequent nuclear mutations resulting in complex III-related pathologies. In yeast, the mimicking of some pathogenic mutations causes a respiratory deficiency. We have screened chemical libraries and found that two antibiotics, pentamidine and clarithromycin, can compensate two bcs1 point mutations in yeast, one of which is the equivalent of a mutation found in a human patient. As both antibiotics target the large mtrRNA of the mitoribosome, we focused our analysis on mitochondrial translation. We found that the absence of non-essential translation factors Rrf1 or Mif3, which act at the recycling/initiation steps, also compensates for the respiratory deficiency of yeast bcs1 mutations. At compensating concentrations, both antibiotics, as well as the absence of Rrf1, cause an imbalanced synthesis of respiratory subunits which impairs the assembly of the respiratory complexes and especially that of complex IV. Finally, we show that pentamidine also decreases the assembly of complex I in nematode mitochondria. It is well known that complexes III and IV exist within the mitochondrial inner membrane as supramolecular complexes III2/IV in yeast or I/III2/IV in higher eukaryotes. Therefore, we propose that the changes in mitochondrial translation caused by the drugs or by the absence of translation factors, can compensate for bcs1 mutations by modifying the equilibrium between illegitimate, and thus inactive, and active supercomplexes.
    Mots-clés : Antibiotics, Bcs1 protein, BIOCELL, BIOMIT, FDMITO, mitochondria, Respiratory chain, translation, Yeast.


  • T. Delerue, F. Khosrobakhsh, M. Daloyau, L. J. Emorine, A. Dedieu, C. J. Herbert, N. Bonnefoy, L. Arnauné-Pelloquin, et P. Belenguer, « Loss of Msp1p in Schizosaccharomyces pombe induces a ROS-dependent nuclear mutator phenotype that affects mitochondrial fission genes », FEBS Letters, vol. 590, nᵒ 20, p. 3544-3558, 2016.
    Mots-clés : BIOCELL, BIOMIT, mitochondrial DNA, mitochondrial fission and fusion, Schizosaccharomyces pombe.

  • A. Lalève, C. Vallières, M. - P. Golinelli-Cohen, C. Bouton, Z. Song, G. Pawlik, S. M. Tindall, S. V. Avery, J. Clain, et B. Meunier, « The antimalarial drug primaquine targets Fe–S cluster proteins and yeast respiratory growth », Redox Biology, vol. 7, p. 21-29, 2016.
    Mots-clés : Aconitase, Aconitate Hydratase, Antimalarials, ATP-Binding Cassette Transporters, BIOCELL, BIOMIT, Cytochrome-B(5) Reductase, Gene Expression Regulation, Fungal, Gene Knockout Techniques, Malaria, mitochondria, Molecular Chaperones, oxidative stress, Primaquine, Saccharomyces cerevisiae, Saccharomyces cerevisiae Proteins, Sod2, Superoxide Dismutase, Yeast model.

  • J. Ostojić, C. Panozzo, A. Bourand-Plantefol, C. J. Herbert, G. Dujardin, et N. Bonnefoy, « Ribosome recycling defects modify the balance between the synthesis and assembly of specific subunits of the oxidative phosphorylation complexes in yeast mitochondria », Nucleic Acids Research, vol. 44, nᵒ 12, p. 5785-5797, juill. 2016.

  • Z. Song, A. Laleve, C. Vallières, J. E. McGeehan, R. E. Lloyd, et B. Meunier, « Human Mitochondrial Cytochrome b Variants Studied in Yeast: Not All Are Silent Polymorphisms », Human Mutation, vol. 37, nᵒ 9, p. 933-941, sept. 2016.
    Résumé : Variations in mitochondrial DNA (mtDNA) cytochrome b (mt-cyb) are frequently found within the healthy population, but also occur within a spectrum of mitochondrial and common diseases. mt-cyb encodes the core subunit (MT-CYB) of complex III, a central component of the oxidative phosphorylation system that drives cellular energy production and homeostasis. Despite significant efforts, most mt-cyb variations identified are not matched with corresponding biochemical data, so their functional and pathogenic consequences in humans remain elusive. While human mtDNA is recalcitrant to genetic manipulation, it is possible to introduce human-associated point mutations into yeast mtDNA. Using this system, we reveal direct links between human mt-cyb variations in key catalytic domains of MT-CYB and significant changes to complex III activity or drug sensitivity. Strikingly, m.15257G>A (p.Asp171Asn) increased the sensitivity of yeast to the antimalarial drug atovaquone, and m.14798T>C (p.Phe18Leu) enhanced the sensitivity of yeast to the antidepressant drug clomipramine. We demonstrate that while a small number of mt-cyb variations had no functional effect, others have the capacity to alter complex III properties, suggesting they could play a wider role in human health and disease than previously thought. This compendium of new mt-cyb-biochemical relationships in yeast provides a resource for future investigations in humans.
    Mots-clés : Atovaquone, BIOCELL, BIOMIT, clomipramine, mitochondrial DNA, MT-CYB, Yeast model.


  • J. - P. Lasserre, A. Dautant, R. S. Aiyar, R. Kucharczyk, A. Glatigny, D. Tribouillard-Tanvier, J. Rytka, M. Blondel, N. Skoczen, P. Reynier, L. Pitayu, A. Rotig, A. Delahodde, L. M. Steinmetz, G. Dujardin, V. Procaccio, et J. - P. di Rago, « Yeast as a system for modeling mitochondrial disease mechanisms and discovering therapies », Disease Models & Mechanisms, vol. 8, nᵒ 6, p. 509-526, juin 2015.
    Mots-clés : Animals, BIM, BIOCELL, BIOMIT, DBG, DNA, Fungal, Drug screening, FDMITO, Genetic suppressors, Humans, mitochondria, Mitochondrial disease, Mitochondrial Diseases, Models, Biological, OXPHOS, Saccharomyces cerevisiae, Translational Medical Research, Yeast.

  • R. E. Lloyd, K. Keatley, D. T. J. Littlewood, B. Meunier, W. V. Holt, Q. An, S. C. Higgins, S. Polyzoidis, K. F. Stephenson, K. Ashkan, H. L. Fillmore, G. J. Pilkington, et J. E. McGeehan, « Identification and functional prediction of mitochondrial complex III and IV mutations associated with glioblastoma », Neuro-Oncology, vol. 17, nᵒ 7, p. 942-952, juill. 2015.
    Mots-clés : Adolescent, Adult, Aged, BIOCELL, BIOMIT, Brain Neoplasms, DNA, Mitochondrial, Electron Transport Complex III, Electron Transport Complex IV, Female, functional prediction, glioblastoma, Humans, Male, Middle Aged, mitochondrial DNA (mtDNA) mutation, Molecular Docking Simulation, Mutation, structural analysis, subgrouping.

  • C. Nesti, M. C. Meschini, B. Meunier, M. Sacchini, S. Doccini, A. Romano, S. Petrillo, I. Pezzini, N. Seddiki, A. Rubegni, F. Piemonte, M. A. Donati, G. Brasseur, et F. M. Santorelli, « Additive effect of nuclear and mitochondrial mutations in a patient with mitochondrial encephalomyopathy », Human Molecular Genetics, vol. 24, nᵒ 11, p. 3248-3256, juin 2015.
    Mots-clés : Adenosine Triphosphate, Adult, Amino Acid Sequence, Base Sequence, BIOCELL, BIOMIT, Diagnosis, Differential, DNA Mutational Analysis, Female, Humans, Mitochondrial Encephalomyopathies, Molecular Diagnostic Techniques, Molecular Sequence Data, Mutation, Missense, Polymorphism, Restriction Fragment Length, Saccharomyces cerevisiae.

  • Z. Song, J. Clain, B. I. Iorga, C. Vallières, A. Lalève, N. Fisher, et B. Meunier, « Interplay between the hinge region of iron sulphur protein and the Qo site in the bc1 complex — Analysis of Plasmodium-like mutations in the yeast enzyme », Biochimica et Biophysica Acta (BBA) - Bioenergetics, vol. 1847, nᵒ 12, p. 1487-1494, 2015.
    Mots-clés : Amino Acid Sequence, Animals, BIOCELL, BIOMIT, Catalysis, Cytochrome b Group, Genetics, Iron-Sulfur Proteins, Malaria parasite, Models, Molecular, Molecular Sequence Data, Plasmodium falciparum, Respiratory complex III, Sequence Homology, Amino Acid, Superoxide production, Superoxides, Yeast model.

  • Z. Song, J. Clain, B. I. Iorga, Z. Yi, N. Fisher, et B. Meunier, « Saccharomyces cerevisiae-based mutational analysis of the bc1 complex Qo site residue 279 to study the trade-off between atovaquone resistance and function », Antimicrobial Agents and Chemotherapy, vol. 59, nᵒ 7, p. 4053-4058, juill. 2015.
    Résumé : The bc1 complex is central to mitochondrial bioenergetics and the target of the antimalarial drug atovaquone that binds in the quinol oxidation (Qo) site of the complex. Structural analysis has shown that the Qo site residue Y279 (Y268 in Plasmodium falciparum) is key for atovaquone binding. Consequently, atovaquone resistance can be acquired by mutation of that residue. In addition to the probability of amino acid substitution, the level of atovaquone resistance and the loss of bc1 complex activity that are associated with the novel amino acid would restrict the nature of resistance-driven mutations occurring on atovaquone exposure in native parasite populations. Using the yeast model, we characterized the effect of all the amino acid replacements resulting from a single nucleotide substitution at codon 279: Y279C, Y279D, Y279F, Y279H, Y279N, and Y279S (Y279C, D, F, H, N, and S). Two residue changes that required a double nucleotide substitution, Y279A and W, were added to the series. We found that mutations Y279A, C, and S conferred high atovaquone resistance but decreased the catalytic activity. Y279F had wild-type enzymatic activity and sensitivity to atovaquone, while the other substitutions caused a dramatic respiratory defect. The results obtained with the yeast model were examined in regard to atomic structure and compared to the reported data on the evolution of acquired atovaquone resistance in P. falciparum.
    Mots-clés : Amino Acid Substitution, Antimalarials, Atovaquone, BIOCELL, Biological Evolution, BIOMIT, Catalysis, Codon, DNA Mutational Analysis, Drug Resistance, Electron Transport Complex III, Hydroquinones, Ligands, Models, Molecular, Mutation, Oxidation-Reduction, Plasmodium falciparum, Saccharomyces cerevisiae.
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Principales publications 2011-2014

  • Ostojić, J., Glatigny, A., Herbert, C. J., Dujardin, G. and Bonnefoy, N. (2014) Does the study of genetic interactions help predict the function of mitochondrial proteins in Saccharomyces cerevisiae ? Biochimie 100, 27–37.
  • Dujeancourt, L., Richter, R., Chrzanowska-Lightowlers, Z. M., Bonnefoy, N. and Herbert, C. J. (2013) Interactions between peptidyl tRNA hydrolase homologs and the ribosomal release factor Mrf1 in S. pombe mitochondria. Mitochondrion 13, 871–80.
  • Herbert, C. J., Golik, P. and Bonnefoy, N. (2013) Yeast PPR proteins, watchdogs of mitochondrial gene expression. RNA Biol. 10, 1477–94.
  • Ostojić, J., Panozzo, C., Lasserre, J.-P., Nouet, C., Courtin, F., Blancard, C., di Rago, J.-P. and Dujardin, G. (2013) The energetic state of mitochondria modulates complex III biogenesis through the ATP-dependent activity of Bcs1. Cell Metab. 18, 567–77.
  • Herrmann, J.M., Wöllhaf, M.W. and Bonnefoy, N. (2013) Control of protein synthesis in yeast mitochondria : The concept of translational activators. Biochim Biophys Acta, 1833, 286-294.
  • -* Vallières, C., Fisher, N. and Meunier, B. (2013). Reconstructing the Qo site of Plasmodium falciparum bc1 complex in the yeast enzyme. PLoS One. 12, e71726.
  • Kühl, I., Fox, T.D. and Bonnefoy, N. (2012) Schizosaccharomyces pombe homologs of the Saccharomyces cerevisiae mitochondrial proteins Cbp6 and Mss51 function at a post-translational step of respiratory complex biogenesis. Mitochondrion 12, 381-390.
  • Vallières, C., Fisher, N., Antoine, T., Al-Helal, M., Stocks, P., Berry, N., Lawrenson, A.S., Ward, S.A., O’ Neill, P.M., Biagini, G.A. and Meunier, B. (2012). HDQ, a potent inhibitor of Plasmodium falciparum proliferation targeting the Qi site of the bc1 complex. Antimicrob. Agents Chemother. 56, 3739-3747.
  • Vallières, C., Fisher,N., Lemoine, M., Pamlard, O., Beaupierre, S., Guillou, C. and Meunier, B. (2012). A rapid in vivo colorimetric library screen for inhibitors of microbial respiration. ACS Chem. Biol.7, 1659-65.
  • Kühl, I., Dujeancourt, L., Gaisne, M., Herbert, C. J. and Bonnefoy, N. (2011) A genome wide study in fission yeast reveals nine PPR proteins that regulate mitochondrial gene expression. Nucleic Acids Res. 39, 8029–41.
  • Vallières, C., Trouillard, M., Dujardin, G. and Meunier, B. (2011) Deleterious effect of the Qo inhibitor compound resistance-conferring mutation G143A in the intron-containing cytochrome b gene and mechanisms for bypassing it. Appl. Environ. Microbiol. 77, 2088–93.

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