LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 24

Search options

  1. Article ; Online: The DEAD-Box RNA Helicase Ded1 Is Associated with Translating Ribosomes

    Yeter-Alat, Hilal / Belgareh-Touzé, Naïma / Huvelle, Emmeline / Banroques, Josette / Tanner, N. Kyle

    Genes (Basel). 2023 July 31, v. 14, no. 8

    2023  

    Abstract: DEAD-box RNA helicases are ATP-dependent RNA binding proteins and RNA-dependent ATPases that possess weak, nonprocessive unwinding activity in vitro, but they can form long-lived complexes on RNAs when the ATPase activity is inhibited. Ded1 is a yeast ... ...

    Abstract DEAD-box RNA helicases are ATP-dependent RNA binding proteins and RNA-dependent ATPases that possess weak, nonprocessive unwinding activity in vitro, but they can form long-lived complexes on RNAs when the ATPase activity is inhibited. Ded1 is a yeast DEAD-box protein, the functional ortholog of mammalian DDX3, that is considered important for the scanning efficiency of the 48S pre-initiation complex ribosomes to the AUG start codon. We used a modified PAR-CLIP technique, which we call quicktime PAR-CLIP (qtPAR-CLIP), to crosslink Ded1 to 4-thiouridine-incorporated RNAs in vivo using UV light centered at 365 nm. The irradiation conditions are largely benign to the yeast cells and to Ded1, and we are able to obtain a high efficiency of crosslinking under physiological conditions. We find that Ded1 forms crosslinks on the open reading frames of many different mRNAs, but it forms the most extensive interactions on relatively few mRNAs, and particularly on mRNAs encoding certain ribosomal proteins and translation factors. Under glucose-depletion conditions, the crosslinking pattern shifts to mRNAs encoding metabolic and stress-related proteins, which reflects the altered translation. These data are consistent with Ded1 functioning in the regulation of translation elongation, perhaps by pausing or stabilizing the ribosomes through its ATP-dependent binding.
    Keywords DEAD-box RNA helicases ; RNA ; adenosinetriphosphatase ; crosslinking ; irradiation ; mammals ; ribosomes ; start codon ; ultraviolet radiation ; yeasts
    Language English
    Dates of publication 2023-0731
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article ; Online
    ZDB-ID 2527218-4
    ISSN 2073-4425
    ISSN 2073-4425
    DOI 10.3390/genes14081566
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  2. Article ; Online: The DEAD-Box RNA Helicase Ded1 Is Associated with Translating Ribosomes.

    Yeter-Alat, Hilal / Belgareh-Touzé, Naïma / Huvelle, Emmeline / Banroques, Josette / Tanner, N Kyle

    Genes

    2023  Volume 14, Issue 8

    Abstract: DEAD-box RNA helicases are ATP-dependent RNA binding proteins and RNA-dependent ATPases that possess weak, nonprocessive unwinding activity in vitro, but they can form long-lived complexes on RNAs when the ATPase activity is inhibited. Ded1 is a yeast ... ...

    Abstract DEAD-box RNA helicases are ATP-dependent RNA binding proteins and RNA-dependent ATPases that possess weak, nonprocessive unwinding activity in vitro, but they can form long-lived complexes on RNAs when the ATPase activity is inhibited. Ded1 is a yeast DEAD-box protein, the functional ortholog of mammalian DDX3, that is considered important for the scanning efficiency of the 48S pre-initiation complex ribosomes to the AUG start codon. We used a modified PAR-CLIP technique, which we call quicktime PAR-CLIP (qtPAR-CLIP), to crosslink Ded1 to 4-thiouridine-incorporated RNAs in vivo using UV light centered at 365 nm. The irradiation conditions are largely benign to the yeast cells and to Ded1, and we are able to obtain a high efficiency of crosslinking under physiological conditions. We find that Ded1 forms crosslinks on the open reading frames of many different mRNAs, but it forms the most extensive interactions on relatively few mRNAs, and particularly on mRNAs encoding certain ribosomal proteins and translation factors. Under glucose-depletion conditions, the crosslinking pattern shifts to mRNAs encoding metabolic and stress-related proteins, which reflects the altered translation. These data are consistent with Ded1 functioning in the regulation of translation elongation, perhaps by pausing or stabilizing the ribosomes through its ATP-dependent binding.
    MeSH term(s) Animals ; Saccharomyces cerevisiae/genetics ; Ribosomes/genetics ; Ribosomal Proteins ; RNA ; RNA, Messenger ; Fungal Proteins ; Heat-Shock Proteins ; DEAD-box RNA Helicases/genetics ; Adenosine Triphosphate/genetics ; Mammals
    Chemical Substances Ribosomal Proteins ; RNA (63231-63-0) ; RNA, Messenger ; Fungal Proteins ; Heat-Shock Proteins ; DEAD-box RNA Helicases (EC 3.6.4.13) ; Adenosine Triphosphate (8L70Q75FXE)
    Language English
    Publishing date 2023-07-31
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2527218-4
    ISSN 2073-4425 ; 2073-4425
    ISSN (online) 2073-4425
    ISSN 2073-4425
    DOI 10.3390/genes14081566
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: Mitofusin-mediated contacts between mitochondria and peroxisomes regulate mitochondrial fusion.

    Alsayyah, Cynthia / Singh, Manish K / Morcillo-Parra, Maria Angeles / Cavellini, Laetitia / Shai, Nadav / Schmitt, Christine / Schuldiner, Maya / Zalckvar, Einat / Mallet, Adeline / Belgareh-Touzé, Naïma / Zimmer, Christophe / Cohen, Mickaël M

    PLoS biology

    2024  Volume 22, Issue 4, Page(s) e3002602

    Abstract: Mitofusins are large GTPases that trigger fusion of mitochondrial outer membranes. Similarly to the human mitofusin Mfn2, which also tethers mitochondria to the endoplasmic reticulum (ER), the yeast mitofusin Fzo1 stimulates contacts between Peroxisomes ... ...

    Abstract Mitofusins are large GTPases that trigger fusion of mitochondrial outer membranes. Similarly to the human mitofusin Mfn2, which also tethers mitochondria to the endoplasmic reticulum (ER), the yeast mitofusin Fzo1 stimulates contacts between Peroxisomes and Mitochondria when overexpressed. Yet, the physiological significance and function of these "PerMit" contacts remain unknown. Here, we demonstrate that Fzo1 naturally localizes to peroxisomes and promotes PerMit contacts in physiological conditions. These contacts are regulated through co-modulation of Fzo1 levels by the ubiquitin-proteasome system (UPS) and by the desaturation status of fatty acids (FAs). Contacts decrease under low FA desaturation but reach a maximum during high FA desaturation. High-throughput genetic screening combined with high-resolution cellular imaging reveal that Fzo1-mediated PerMit contacts favor the transit of peroxisomal citrate into mitochondria. In turn, citrate enters the TCA cycle to stimulate the mitochondrial membrane potential and maintain efficient mitochondrial fusion upon high FA desaturation. These findings thus unravel a mechanism by which inter-organelle contacts safeguard mitochondrial fusion.
    Language English
    Publishing date 2024-04-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2126776-5
    ISSN 1545-7885 ; 1544-9173
    ISSN (online) 1545-7885
    ISSN 1544-9173
    DOI 10.1371/journal.pbio.3002602
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article ; Online: Exploring selective autophagy events in multiple biologic models using LC3-interacting regions (LIR)-based molecular traps.

    Quinet, Grégoire / Génin, Pierre / Ozturk, Oznur / Belgareh-Touzé, Naima / Courtot, Lilas / Legouis, Renaud / Weil, Robert / Cohen, Mickael M / Rodriguez, Manuel S

    Scientific reports

    2022  Volume 12, Issue 1, Page(s) 7652

    Abstract: Autophagy is an essential cellular pathway that ensures degradation of a wide range of substrates including damaged organelles or large protein aggregates. Understanding how this proteolytic pathway is regulated would increase our comprehension on its ... ...

    Abstract Autophagy is an essential cellular pathway that ensures degradation of a wide range of substrates including damaged organelles or large protein aggregates. Understanding how this proteolytic pathway is regulated would increase our comprehension on its role in cellular physiology and contribute to identify biomarkers or potential drug targets to develop more specific treatments for disease in which autophagy is dysregulated. Here, we report the development of molecular traps based in the tandem disposition of LC3-interacting regions (LIR). The estimated affinity of LC3-traps for distinct recombinant LC3/GABARAP proteins is in the low nanomolar range and allows the capture of these proteins from distinct mammalian cell lines, S. cerevisiae and C. elegans. LC3-traps show preferences for GABARAP/LGG1 or LC3/LGG2 and pull-down substrates targeted to proteaphagy and mitophagy. Therefore, LC3-traps are versatile tools that can be adapted to multiple applications to monitor selective autophagy events in distinct physiologic and pathologic circumstances.
    MeSH term(s) Animals ; Autophagy ; Caenorhabditis elegans/metabolism ; Macroautophagy ; Mammals/metabolism ; Microtubule-Associated Proteins/metabolism ; Models, Biological ; Protein Binding ; Saccharomyces cerevisiae/metabolism
    Chemical Substances Microtubule-Associated Proteins
    Language English
    Publishing date 2022-05-10
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-022-11417-z
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Analysis of ATG8 Family Members Using LC3-Interacting Regions (LIR)-Based Molecular Traps.

    Quinet, Grégoire / Génin, Pierre / Belgareh-Touzé, Naima / Ozturk, Oznur / Weil, Robert / Cohen, Mickael M / Legouis, Renaud / Rodriguez, Manuel S

    Methods in molecular biology (Clifton, N.J.)

    2022  Volume 2602, Page(s) 191–204

    Abstract: The ATG8 family of proteins regulates the autophagy process from the autophagosome maturation and cargo recruitment up to degradation. Autophagy dysfunction is involved in the development of multiple diseases. The LC3 interacting region (LIR)-based ... ...

    Abstract The ATG8 family of proteins regulates the autophagy process from the autophagosome maturation and cargo recruitment up to degradation. Autophagy dysfunction is involved in the development of multiple diseases. The LC3 interacting region (LIR)-based molecular traps have been designed to isolate endogenous ATG8 proteins and their interactors in order to facilitate the study of selective autophagy events. Here, we summarize protocols describing LC3 traps and sample preparation as well as adaptations for the analysis of ATG8 proteins in different biological models. This protocol was optimized to prepare affinity columns, reduce background, and improve the protein recovery to be analyzed by immunodetection with antibodies recognizing proteins of interest.
    MeSH term(s) Autophagy-Related Protein 8 Family/genetics ; Macroautophagy ; Acclimatization ; Antibodies ; Autophagy
    Chemical Substances Autophagy-Related Protein 8 Family ; Antibodies
    Language English
    Publishing date 2022-11-29
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-0716-2859-1_14
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article: The regulation of mitochondrial homeostasis by the ubiquitin proteasome system

    Alsayyah, Cynthia / Ozturk, Oznur / Cavellini, Laetitia / Belgareh-Touzé, Naïma / Cohen, Mickael M

    Biochimica et biophysica acta. 2020 Dec. 01, v. 1861, no. 12

    2020  

    Abstract: From mitochondrial quality control pathways to the regulation of specific functions, the Ubiquitin Proteasome System (UPS) could be compared to a Swiss knife without which mitochondria could not maintain its integrity in the cell. Here, we review the ... ...

    Abstract From mitochondrial quality control pathways to the regulation of specific functions, the Ubiquitin Proteasome System (UPS) could be compared to a Swiss knife without which mitochondria could not maintain its integrity in the cell. Here, we review the mechanisms that the UPS employs to regulate mitochondrial function and efficiency. For this purpose, we depict how Ubiquitin and the Proteasome participate in diverse quality control pathways that safeguard entry into the mitochondrial compartment. A focus is then achieved on the UPS-mediated control of the yeast mitofusin Fzo1 which provides insights into the complex regulation of this particular protein in mitochondrial fusion. We ultimately dissect the mechanisms by which the UPS controls the degradation of mitochondria by autophagy in both mammalian and yeast systems. This organization should offer a useful overview of this abundant but fascinating literature on the crosstalks between mitochondria and the UPS.
    Keywords autophagy ; homeostasis ; mammals ; mitochondria ; proteasome endopeptidase complex ; quality control ; ubiquitin ; yeasts
    Language English
    Dates of publication 2020-1201
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 282711-6
    ISSN 0005-2728 ; 0304-4173
    ISSN 0005-2728 ; 0304-4173
    DOI 10.1016/j.bbabio.2020.148302
    Database NAL-Catalogue (AGRICOLA)

    More links

    Kategorien

  7. Article ; Online: The regulation of mitochondrial homeostasis by the ubiquitin proteasome system.

    Alsayyah, Cynthia / Ozturk, Oznur / Cavellini, Laetitia / Belgareh-Touzé, Naïma / Cohen, Mickael M

    Biochimica et biophysica acta. Bioenergetics

    2020  Volume 1861, Issue 12, Page(s) 148302

    Abstract: From mitochondrial quality control pathways to the regulation of specific functions, the Ubiquitin Proteasome System (UPS) could be compared to a Swiss knife without which mitochondria could not maintain its integrity in the cell. Here, we review the ... ...

    Abstract From mitochondrial quality control pathways to the regulation of specific functions, the Ubiquitin Proteasome System (UPS) could be compared to a Swiss knife without which mitochondria could not maintain its integrity in the cell. Here, we review the mechanisms that the UPS employs to regulate mitochondrial function and efficiency. For this purpose, we depict how Ubiquitin and the Proteasome participate in diverse quality control pathways that safeguard entry into the mitochondrial compartment. A focus is then achieved on the UPS-mediated control of the yeast mitofusin Fzo1 which provides insights into the complex regulation of this particular protein in mitochondrial fusion. We ultimately dissect the mechanisms by which the UPS controls the degradation of mitochondria by autophagy in both mammalian and yeast systems. This organization should offer a useful overview of this abundant but fascinating literature on the crosstalks between mitochondria and the UPS.
    MeSH term(s) Animals ; Homeostasis ; Humans ; Mitochondria/metabolism ; Mitophagy ; Proteasome Endopeptidase Complex/metabolism ; Ubiquitin/metabolism ; Ubiquitination
    Chemical Substances Ubiquitin ; Proteasome Endopeptidase Complex (EC 3.4.25.1)
    Language English
    Publishing date 2020-08-27
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 60-7
    ISSN 1879-2650 ; 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618 ; 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    ISSN (online) 1879-2650 ; 1879-2596 ; 1879-260X ; 1872-8006 ; 1879-2642 ; 1879-2618
    ISSN 0006-3002 ; 0005-2728 ; 0005-2736 ; 0304-4165 ; 0167-4838 ; 1388-1981 ; 0167-4889 ; 0167-4781 ; 0304-419X ; 1570-9639 ; 0925-4439 ; 1874-9399
    DOI 10.1016/j.bbabio.2020.148302
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  8. Article ; Online: Ubiquitination of ERMES components by the E3 ligase Rsp5 is involved in mitophagy.

    Belgareh-Touzé, Naïma / Cavellini, Laetitia / Cohen, Mickael M

    Autophagy

    2017  Volume 13, Issue 1, Page(s) 114–132

    Abstract: Mitochondria are dynamic organelles that undergo permanent fission and fusion events. These processes play an essential role in maintaining normal cellular function. In the yeast Saccharomyces cerevisiae, the endoplasmic reticulum-mitochondrial encounter ...

    Abstract Mitochondria are dynamic organelles that undergo permanent fission and fusion events. These processes play an essential role in maintaining normal cellular function. In the yeast Saccharomyces cerevisiae, the endoplasmic reticulum-mitochondrial encounter structure (ERMES) is a marker of sites of mitochondrial division, but it is also involved in a plethora of other mitochondrial functions. However, it remains unclear how these different functions are regulated. We show here that Mdm34 and Mdm12, 2 components of ERMES, are ubiquitinated by the E3 ligase Rsp5. This ubiquitination is not involved in mitochondrial dynamics or in the distribution and turnover of ERMES. Nevertheless, the ubiquitination of Mdm34 and Mdm12 was required for efficient mitophagy. We thus report here the first identification of ubiquitinated substrates participating in yeast mitophagy.
    Language English
    Publishing date 2017-01-02
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2454135-7
    ISSN 1554-8635 ; 1554-8627
    ISSN (online) 1554-8635
    ISSN 1554-8627
    DOI 10.1080/15548627.2016.1252889
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: An ubiquitin-dependent balance between mitofusin turnover and fatty acids desaturation regulates mitochondrial fusion.

    Cavellini, Laetitia / Meurisse, Julie / Findinier, Justin / Erpapazoglou, Zoi / Belgareh-Touzé, Naïma / Weissman, Allan M / Cohen, Mickael M

    Nature communications

    2017  Volume 8, Page(s) 15832

    Abstract: Mitochondrial integrity relies on homotypic fusion between adjacent outer membranes, which is mediated by large GTPases called mitofusins. The regulation of this process remains nonetheless elusive. Here, we report a crosstalk between the ubiquitin ... ...

    Abstract Mitochondrial integrity relies on homotypic fusion between adjacent outer membranes, which is mediated by large GTPases called mitofusins. The regulation of this process remains nonetheless elusive. Here, we report a crosstalk between the ubiquitin protease Ubp2 and the ubiquitin ligases Mdm30 and Rsp5 that modulates mitochondrial fusion. Ubp2 is an antagonist of Rsp5, which promotes synthesis of the fatty acids desaturase Ole1. We show that Ubp2 also counteracts Mdm30-mediated turnover of the yeast mitofusin Fzo1 and that Mdm30 targets Ubp2 for degradation thereby inducing Rsp5-mediated desaturation of fatty acids. Exogenous desaturated fatty acids inhibit Ubp2 degradation resulting in higher levels of Fzo1 and maintenance of efficient mitochondrial fusion. Our results demonstrate that the Mdm30-Ubp2-Rsp5 crosstalk regulates mitochondrial fusion by coordinating an intricate balance between Fzo1 turnover and the status of fatty acids saturation. This pathway may link outer membrane fusion to lipids homeostasis.
    MeSH term(s) Endopeptidases/genetics ; Endopeptidases/metabolism ; Endosomal Sorting Complexes Required for Transport/genetics ; Endosomal Sorting Complexes Required for Transport/metabolism ; F-Box Proteins/genetics ; F-Box Proteins/metabolism ; Fatty Acids/metabolism ; GTP Phosphohydrolases/genetics ; GTP Phosphohydrolases/metabolism ; Membrane Proteins/genetics ; Membrane Proteins/metabolism ; Mitochondria/genetics ; Mitochondria/metabolism ; Mitochondrial Dynamics ; Mitochondrial Proteins/genetics ; Mitochondrial Proteins/metabolism ; Saccharomyces cerevisiae/enzymology ; Saccharomyces cerevisiae/genetics ; Saccharomyces cerevisiae/metabolism ; Saccharomyces cerevisiae Proteins/genetics ; Saccharomyces cerevisiae Proteins/metabolism ; Ubiquitin/metabolism ; Ubiquitin-Protein Ligase Complexes/genetics ; Ubiquitin-Protein Ligase Complexes/metabolism
    Chemical Substances Endosomal Sorting Complexes Required for Transport ; F-Box Proteins ; Fatty Acids ; Mdm30 protein, S cerevisiae ; Membrane Proteins ; Mitochondrial Proteins ; Saccharomyces cerevisiae Proteins ; Ubiquitin ; Ubiquitin-Protein Ligase Complexes (EC 2.3.2.23) ; Endopeptidases (EC 3.4.-) ; ubiquitin-Nalpha-protein hydrolase (EC 3.4.99.-) ; FZO1 protein, S cerevisiae (EC 3.6.1.-) ; GTP Phosphohydrolases (EC 3.6.1.-) ; RSP5 protein, S cerevisiae (EC 6.3.2.-)
    Language English
    Publishing date 2017-06-13
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2041-1723
    ISSN (online) 2041-1723
    DOI 10.1038/ncomms15832
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article: Expressing the Erwinia amylovora type III effector DspA/E in the yeast Saccharomyces cerevisiae strongly alters cellular trafficking.

    Siamer, Sabrina / Patrit, Oriane / Fagard, Mathilde / Belgareh-Touzé, Naïma / Barny, Marie-Anne

    FEBS open bio

    2011  Volume 1, Page(s) 23–28

    Abstract: Erwinia amylovora is responsible for fire blight, a necrotic disease of apples and pears. E. amylovora relies on a type III secretion system (T3SS) to induce disease on host plants. DspA/E belongs to the AvrE family of type III effector. Effectors of the ...

    Abstract Erwinia amylovora is responsible for fire blight, a necrotic disease of apples and pears. E. amylovora relies on a type III secretion system (T3SS) to induce disease on host plants. DspA/E belongs to the AvrE family of type III effector. Effectors of the AvrE family are injected via the T3SS in plant cell and are important to promote bacterial growth following infection and to suppress plant defense responses. Their mode of action in the plant cells is unknown. Here we study the physiological effects induced by dspA/E expression in the yeast Saccharomyces cerevisiae. Expression of dspA/E in the yeast inhibits cell growth. This growth inhibition is associated with perturbations of the actin cytoskeleton and endocytosis.
    Language English
    Publishing date 2011-11-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 2651702-4
    ISSN 2211-5463
    ISSN 2211-5463
    DOI 10.1016/j.fob.2011.11.001
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top