LIVIVO - The Search Portal for Life Sciences

zur deutschen Oberfläche wechseln
Advanced search

Search results

Result 1 - 10 of total 19

Search options

  1. Article: Phosphorylation and

    Cantrelle, François-Xavier / Loyens, Anne / Trivelli, Xavier / Reimann, Oliver / Despres, Clément / Gandhi, Neha S / Hackenberger, Christian P R / Landrieu, Isabelle / Smet-Nocca, Caroline

    Frontiers in molecular neuroscience

    2021  Volume 14, Page(s) 661368

    Abstract: Phosphorylation of the neuronal microtubule-associated Tau protein plays a critical role in the aggregation process leading to the formation of insoluble intraneuronal fibrils within Alzheimer's disease (AD) brains. In recent years, other ... ...

    Abstract Phosphorylation of the neuronal microtubule-associated Tau protein plays a critical role in the aggregation process leading to the formation of insoluble intraneuronal fibrils within Alzheimer's disease (AD) brains. In recent years, other posttranslational modifications (PTMs) have been highlighted in the regulation of Tau (dys)functions. Among these PTMs, the
    Language English
    Publishing date 2021-06-17
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2452967-9
    ISSN 1662-5099
    ISSN 1662-5099
    DOI 10.3389/fnmol.2021.661368
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  2. Article ; Online: Semi-synthesis of a tag-free O-GlcNAcylated tau protein by sequential chemoselective ligation.

    Schwagerus, Sergej / Reimann, Oliver / Despres, Clement / Smet-Nocca, Caroline / Hackenberger, Christian P R

    Journal of peptide science : an official publication of the European Peptide Society

    2016  Volume 22, Issue 5, Page(s) 327–333

    Abstract: In this paper, the first semi-synthesis of the Alzheimer-relevant tau protein carrying an O-GlcNAcylation is demonstrated by using sequential chemoselective ligation. The 52-amino acid C-terminus of tau was obtained by native chemical ligation between ... ...

    Abstract In this paper, the first semi-synthesis of the Alzheimer-relevant tau protein carrying an O-GlcNAcylation is demonstrated by using sequential chemoselective ligation. The 52-amino acid C-terminus of tau was obtained by native chemical ligation between two synthetic peptide fragments, one carrying the O-GlcNAc moiety on Ser400, which has recently been demonstrated to inhibit tau phosphorylation and to hinder tau oligomerization, and the other equipped with a photocleavable biotin handle. After desulfurization to deliver a native alanine at the ligation junction, the N-terminal cysteine was unmasked, and the peptide was further used for expressed protein ligation to generate the full-length tau protein, which was purified by a photocleavable biotin tag. We thus provide a synthetic route to obtain a homogenous tag-free O-GlcNAcylated tau protein that can further help to elucidate the significance of posttranslational modification on the tau protein and pave the way for evaluating possible drug targets in Alzheimer's disease. Copyright © 2016 European Peptide Society and John Wiley & Sons, Ltd.
    MeSH term(s) Acetylglucosamine/chemistry ; Alzheimer Disease/metabolism ; Chemistry Techniques, Synthetic ; Humans ; Molecular Structure ; Peptides/chemistry ; Protein Processing, Post-Translational ; Serine/chemistry ; tau Proteins/chemical synthesis ; tau Proteins/chemistry
    Chemical Substances Peptides ; tau Proteins ; Serine (452VLY9402) ; Acetylglucosamine (V956696549)
    Language English
    Publishing date 2016-05
    Publishing country England
    Document type Journal Article
    ZDB-ID 1234416-3
    ISSN 1099-1387 ; 1075-2617
    ISSN (online) 1099-1387
    ISSN 1075-2617
    DOI 10.1002/psc.2870
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  3. Article ; Online: The Study of Posttranslational Modifications of Tau Protein by Nuclear Magnetic Resonance Spectroscopy: Phosphorylation of Tau Protein by ERK2 Recombinant Kinase and Rat Brain Extract, and Acetylation by Recombinant Creb-Binding Protein.

    Qi, Haoling / Despres, Clément / Prabakaran, Sudhakaran / Cantrelle, François-Xavier / Chambraud, Béatrice / Gunawardena, Jeremy / Lippens, Guy / Smet-Nocca, Caroline / Landrieu, Isabelle

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

    2017  Volume 1523, Page(s) 179–213

    Abstract: Nuclear magnetic resonance (NMR) spectroscopy can be used as an analytical tool to investigate posttranslational modifications of protein. NMR is a valuable tool to map the interaction regions of protein partners. Here, we present protocols that have ... ...

    Abstract Nuclear magnetic resonance (NMR) spectroscopy can be used as an analytical tool to investigate posttranslational modifications of protein. NMR is a valuable tool to map the interaction regions of protein partners. Here, we present protocols that have been developed in the course of our studies of the neuronal Tau protein. Tau is found aggregated in the neurons of Alzheimer's disease patients. Development of the disease is accompanied by increased, abnormal phosphorylation and acetylation of Tau. We have used NMR to investigate how these posttranslational modifications of Tau affect the interactions with its partners. We present here detailed protocols of in vitro phosphorylation of Tau by recombinant kinase, ERK2, or kinase activity of rat brain extracts, and acetylation by recombinant Creb-binding protein (CBP) acetyltransferase. The analytical characterization of the modified Tau by NMR spectroscopy is additionally described.
    Language English
    Publishing date 2017
    Publishing country United States
    Document type Journal Article
    ISSN 1940-6029
    ISSN (online) 1940-6029
    DOI 10.1007/978-1-4939-6598-4_11
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  4. Article: Dendrogenin A synergizes with Cytarabine to Kill Acute Myeloid Leukemia Cells In Vitro and In Vivo.

    Serhan, Nizar / Mouchel, Pierre-Luc / Medina, Philippe de / Segala, Gregory / Mougel, Aurélie / Saland, Estelle / Rives, Arnaud / Lamaziere, Antonin / Despres, Gaëtan / Sarry, Jean-Emmanuel / Larrue, Clément / Vergez, François / Largeaud, Laetitia / Record, Michel / Récher, Christian / Silvente-Poirot, Sandrine / Poirot, Marc

    Cancers

    2020  Volume 12, Issue 7

    Abstract: Dendrogenin A (DDA) is a mammalian cholesterol metabolite that displays potent antitumor properties on acute myeloid leukemia (AML). DDA triggers lethal autophagy in cancer cells through a biased activation of the oxysterol receptor LXRβ, and the ... ...

    Abstract Dendrogenin A (DDA) is a mammalian cholesterol metabolite that displays potent antitumor properties on acute myeloid leukemia (AML). DDA triggers lethal autophagy in cancer cells through a biased activation of the oxysterol receptor LXRβ, and the inhibition of a sterol isomerase. We hypothesize that DDA could potentiate the activity of an anticancer drug acting through a different molecular mechanism, and conducted in vitro and in vivo combination tests on AML cell lines and patient primary tumors. We report here results from tests combining DDA with antimetabolite cytarabine (Ara-C), one of the main drugs used for AML treatment worldwide. We demonstrated that DDA potentiated and sensitized AML cells, including primary patient samples, to Ara-C in vitro and in vivo. Mechanistic studies revealed that this sensitization was LXRβ-dependent and was due to the activation of lethal autophagy. This study demonstrates a positive in vitro and in vivo interaction between DDA and Ara-C, and supports the clinical evaluation of DDA in combination with Ara-C for the treatment of AML.
    Language English
    Publishing date 2020-06-29
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2527080-1
    ISSN 2072-6694
    ISSN 2072-6694
    DOI 10.3390/cancers12071725
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  5. Article ; Online: Nuclear Magnetic Resonance Spectroscopy for the Identification of Multiple Phosphorylations of Intrinsically Disordered Proteins.

    Danis, Clément / Despres, Clément / Bessa, Luiza M / Malki, Idir / Merzougui, Hamida / Huvent, Isabelle / Qi, Haoling / Lippens, Guy / Cantrelle, François-Xavier / Schneider, Robert / Hanoulle, Xavier / Smet-Nocca, Caroline / Landrieu, Isabelle

    Journal of visualized experiments : JoVE

    2016  , Issue 118

    Abstract: Aggregates of the neuronal Tau protein are found inside neurons of Alzheimer's disease patients. Development of the disease is accompanied by increased, abnormal phosphorylation of Tau. In the course of the molecular investigation of Tau functions and ... ...

    Abstract Aggregates of the neuronal Tau protein are found inside neurons of Alzheimer's disease patients. Development of the disease is accompanied by increased, abnormal phosphorylation of Tau. In the course of the molecular investigation of Tau functions and dysfunctions in the disease, nuclear magnetic resonance (NMR) spectroscopy is used to identify the multiple phosphorylations of Tau. We present here detailed protocols of recombinant production of Tau in bacteria, with isotopic enrichment for NMR studies. Purification steps that take advantage of Tau's heat stability and high isoelectric point are described. The protocol for in vitro phosphorylation of Tau by recombinant activated ERK2 allows for generating multiple phosphorylations. The protein sample is ready for data acquisition at the issue of these steps. The parameter setup to start recording on the spectrometer is considered next. Finally, the strategy to identify phosphorylation sites of modified Tau, based on NMR data, is explained. The benefit of this methodology compared to other techniques used to identify phosphorylation sites, such as immuno-detection or mass spectrometry (MS), is discussed.
    MeSH term(s) Alzheimer Disease ; Humans ; Intrinsically Disordered Proteins/chemistry ; Magnetic Resonance Spectroscopy ; Phosphorylation ; Recombinant Proteins/biosynthesis ; Recombinant Proteins/chemistry ; tau Proteins/chemistry
    Chemical Substances Intrinsically Disordered Proteins ; Recombinant Proteins ; tau Proteins
    Language English
    Publishing date 2016-12-27
    Publishing country United States
    Document type Journal Article ; Video-Audio Media
    ISSN 1940-087X
    ISSN (online) 1940-087X
    DOI 10.3791/55001
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  6. Article ; Online: NMR Meets Tau: Insights into Its Function and Pathology.

    Lippens, Guy / Landrieu, Isabelle / Smet, Caroline / Huvent, Isabelle / Gandhi, Neha S / Gigant, Benoît / Despres, Clément / Qi, Haoling / Lopez, Juan

    Biomolecules

    2016  Volume 6, Issue 2

    Abstract: In this review, we focus on what we have learned from Nuclear Magnetic Resonance (NMR) studies on the neuronal microtubule-associated protein Tau. We consider both the mechanistic details of Tau: the tubulin relationship and its aggregation process. ... ...

    Abstract In this review, we focus on what we have learned from Nuclear Magnetic Resonance (NMR) studies on the neuronal microtubule-associated protein Tau. We consider both the mechanistic details of Tau: the tubulin relationship and its aggregation process. Phosphorylation of Tau is intimately linked to both aspects. NMR spectroscopy has depicted accurate phosphorylation patterns by different kinases, and its non-destructive character has allowed functional assays with the same samples. Finally, we will discuss other post-translational modifications of Tau and its interaction with other cellular factors in relationship to its (dys)function.
    MeSH term(s) Intrinsically Disordered Proteins/chemistry ; Intrinsically Disordered Proteins/metabolism ; Nuclear Magnetic Resonance, Biomolecular ; Protein Processing, Post-Translational ; Tubulin/chemistry ; Tubulin/metabolism ; tau Proteins/chemistry ; tau Proteins/metabolism
    Chemical Substances Intrinsically Disordered Proteins ; Tubulin ; tau Proteins
    Language English
    Publishing date 2016-06-07
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Review
    ZDB-ID 2701262-1
    ISSN 2218-273X ; 2218-273X
    ISSN (online) 2218-273X
    ISSN 2218-273X
    DOI 10.3390/biom6020028
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  7. Article ; Online: NMR Meets Tau

    Guy Lippens / Isabelle Landrieu / Caroline Smet / Isabelle Huvent / Neha S. Gandhi / Benoît Gigant / Clément Despres / Haoling Qi / Juan Lopez

    Biomolecules, Vol 6, Iss 2, p

    Insights into Its Function and Pathology

    2016  Volume 28

    Abstract: In this review, we focus on what we have learned from Nuclear Magnetic Resonance (NMR) studies on the neuronal microtubule-associated protein Tau. We consider both the mechanistic details of Tau: the tubulin relationship and its aggregation process. ... ...

    Abstract In this review, we focus on what we have learned from Nuclear Magnetic Resonance (NMR) studies on the neuronal microtubule-associated protein Tau. We consider both the mechanistic details of Tau: the tubulin relationship and its aggregation process. Phosphorylation of Tau is intimately linked to both aspects. NMR spectroscopy has depicted accurate phosphorylation patterns by different kinases, and its non-destructive character has allowed functional assays with the same samples. Finally, we will discuss other post-translational modifications of Tau and its interaction with other cellular factors in relationship to its (dys)function.
    Keywords Tau ; NMR spectroscopy ; intrinsically disordered protein ; tubulin ; aggregation ; phosphorylation ; protein/protein interactions ; Biology (General) ; QH301-705.5 ; Science ; Q
    Language English
    Publishing date 2016-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    More links

    Kategorien

  8. Article ; Online: The relationship between adiposopathy and glucose-insulin homeostasis is not affected by moderate-intensity aerobic training in healthy women with obesity.

    Clément, Andrée-Anne / Riesco, Eléonor / Tessier, Sébastien / Lacaille, Michel / Pérusse, Francine / Coté, Mélanie / Després, Jean-Pierre / Weisnagel, John / Doré, Jean / Joanisse, Denis R / Mauriège, Pascale

    Journal of physiology and biochemistry

    2018  Volume 74, Issue 4, Page(s) 591–601

    Abstract: The contribution of adiposopathy to glucose-insulin homeostasis remains unclear. This longitudinal study examined the potential relationship between the adiponectin/leptin ratio (A/L, a marker of adiposopathy) and insulin resistance (IR: homeostasis ... ...

    Abstract The contribution of adiposopathy to glucose-insulin homeostasis remains unclear. This longitudinal study examined the potential relationship between the adiponectin/leptin ratio (A/L, a marker of adiposopathy) and insulin resistance (IR: homeostasis model assessment (HOMA)), insulin sensitivity (IS: Matsuda), and insulin response to an oral glucose tolerance test before and after a 16-week walking program, in 29 physically inactive pre- and postmenopausal women with obesity (BMI, 29-35 kg/m
    MeSH term(s) Adiponectin/blood ; Adiposity ; Biomarkers/blood ; Body Mass Index ; Cardiorespiratory Fitness ; Female ; Glucose Tolerance Test ; Humans ; Insulin Resistance ; Leptin/blood ; Longitudinal Studies ; Middle Aged ; Obesity, Metabolically Benign/blood ; Obesity, Metabolically Benign/immunology ; Obesity, Metabolically Benign/metabolism ; Obesity, Metabolically Benign/therapy ; Oxygen Consumption ; Physical Conditioning, Human ; Postmenopause ; Premenopause ; Quebec ; Urban Health ; Walking
    Chemical Substances ADIPOQ protein, human ; Adiponectin ; Biomarkers ; LEP protein, human ; Leptin
    Language English
    Publishing date 2018-04-26
    Publishing country Spain
    Document type Comparative Study ; Journal Article
    ZDB-ID 1325104-1
    ISSN 1877-8755 ; 0034-9402 ; 1138-7548
    ISSN (online) 1877-8755
    ISSN 0034-9402 ; 1138-7548
    DOI 10.1007/s13105-018-0630-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  9. Article ; Online: Native Top-Down Mass Spectrometry and Ion Mobility Spectrometry of the Interaction of Tau Protein with a Molecular Tweezer Assembly Modulator.

    Nshanian, Michael / Lantz, Carter / Wongkongkathep, Piriya / Schrader, Thomas / Klärner, Frank-Gerrit / Blümke, Anika / Despres, Clément / Ehrmann, Michael / Smet-Nocca, Caroline / Bitan, Gal / Loo, Joseph A

    Journal of the American Society for Mass Spectrometry

    2018  Volume 30, Issue 1, Page(s) 16–23

    Abstract: Native top-down mass spectrometry (MS) and ion mobility spectrometry (IMS) were applied to characterize the interaction of a molecular tweezer assembly modulator, CLR01, with tau, a protein believed to be involved in a number of neurodegenerative ... ...

    Abstract Native top-down mass spectrometry (MS) and ion mobility spectrometry (IMS) were applied to characterize the interaction of a molecular tweezer assembly modulator, CLR01, with tau, a protein believed to be involved in a number of neurodegenerative disorders, including Alzheimer's disease. The tweezer CLR01 has been shown to inhibit aggregation of amyloidogenic polypeptides without toxic side effects. ESI-MS spectra for different forms of tau protein (full-length, fragments, phosphorylated, etc.) in the presence of CLR01 indicate a primary binding stoichiometry of 1:1. The relatively high charging of the protein measured from non-denaturing solutions is typical of intrinsically disordered proteins, such as tau. Top-down mass spectrometry using electron capture dissociation (ECD) is a tool used to determine not only the sites of post-translational modifications but also the binding site(s) of non-covalent interacting ligands to biomolecules. The intact protein and the protein-modulator complex were subjected to ECD-MS to obtain sequence information, map phosphorylation sites, and pinpoint the sites of inhibitor binding. The ESI-MS study of intact tau proteins indicates that top-down MS is amenable to the study of various tau isoforms and their post-translational modifications (PTMs). The ECD-MS data point to a CLR01 binding site in the microtubule-binding region of tau, spanning residues K294-K331, which includes a six-residue nucleating segment PHF6 (VQIVYK) implicated in aggregation. Furthermore, ion mobility experiments on the tau fragment in the presence of CLR01 and phosphorylated tau reveal a shift towards a more compact structure. The mass spectrometry study suggests a picture for the molecular mechanism of the modulation of protein-protein interactions in tau by CLR01. Graphical Abstract ᅟ.
    MeSH term(s) Binding Sites ; Bridged-Ring Compounds/chemistry ; Bridged-Ring Compounds/metabolism ; Hydrogen-Ion Concentration ; Ion Mobility Spectrometry/methods ; Organophosphates/chemistry ; Organophosphates/metabolism ; Phosphorylation ; Spectrometry, Mass, Electrospray Ionization/methods ; tau Proteins/chemistry ; tau Proteins/metabolism
    Chemical Substances Bridged-Ring Compounds ; CLR01 compound ; Organophosphates ; tau Proteins
    Language English
    Publishing date 2018-07-30
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1073671-2
    ISSN 1879-1123 ; 1044-0305
    ISSN (online) 1879-1123
    ISSN 1044-0305
    DOI 10.1007/s13361-018-2027-6
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

  10. Article ; Online: Major Differences between the Self-Assembly and Seeding Behavior of Heparin-Induced and in Vitro Phosphorylated Tau and Their Modulation by Potential Inhibitors.

    Despres, Clément / Di, Jing / Cantrelle, François-Xavier / Li, Zizheng / Huvent, Isabelle / Chambraud, Béatrice / Zhao, Jing / Chen, Jianle / Chen, Shiguo / Lippens, Guy / Zhang, Fuming / Linhardt, Robert / Wang, Chunyu / Klärner, Frank-Gerrit / Schrader, Thomas / Landrieu, Isabelle / Bitan, Gal / Smet-Nocca, Caroline

    ACS chemical biology

    2019  Volume 14, Issue 6, Page(s) 1363–1379

    Abstract: ... to produce aggregation-competent forms recently have been introduced ( Despres et al. ( 2017 ) Proc. Natl ...

    Abstract Self-assembly of the microtubule-associated protein tau into neurotoxic oligomers, fibrils, and paired helical filaments, and cell-to-cell spreading of these pathological tau species are critical processes underlying the pathogenesis of Alzheimer's disease and other tauopathies. Modulating the self-assembly process and inhibiting formation and spreading of such toxic species are promising strategies for therapy development. A challenge in investigating tau self-assembly in vitro is that, unlike most amyloidogenic proteins, tau does not aggregate in the absence of posttranslational modifications (PTM), aggregation inducers, or preformed seeds. The most common induction method is addition of polyanions, such as heparin; yet, this artificial system may not represent adequately tau self-assembly in vivo, which is driven by aberrant phosphorylation and other PTMs, potentially leading to in vitro data that do not reflect the behavior of tau and its interaction with modulators in vivo. To tackle these challenges, methods for in vitro phosphorylation of tau to produce aggregation-competent forms recently have been introduced ( Despres et al. ( 2017 ) Proc. Natl. Acad. Sci. U.S.A. , 114 , 9080 - 9085 ). However, the oligomerization, seeding, and interaction with assembly modulators of the different forms of tau have not been studied to date. To address these knowledge gaps, we compared here side-by-side the self-assembly and seeding activity of heparin-induced tau with two forms of in vitro phosphorylated tau and tested how the molecular tweezer CLR01, a negatively charged compound, affected these processes. Tau was phosphorylated by incubation either with activated extracellular signal-regulated kinase 2 or with a whole rat brain extract. Seeding activity was measured using a fluorescence-resonance energy transfer-based biosensor-cell method. We also used solution-state NMR to investigate the binding sites of CLR01 on tau and how they were impacted by phosphorylation. Our systematic structure-activity relationship study demonstrates that heparin-induced tau behaves differently from in vitro phosphorylated tau. The aggregation rates of the different forms are distinct as is the intracellular localization of the induced aggregates, which resemble brain-derived tau strains suggesting that heparin-induced tau and in vitro phosphorylated tau have different conformations, properties, and activities. CLR01 inhibits aggregation and seeding of both heparin-induced and in vitro phosphorylated tau dose-dependently, although heparin induction interferes with the interaction between CLR01 and tau.
    MeSH term(s) Alzheimer Disease/metabolism ; Animals ; Heparin/pharmacology ; Humans ; Phosphorylation ; Rats ; tau Proteins/antagonists & inhibitors ; tau Proteins/metabolism
    Chemical Substances tau Proteins ; Heparin (9005-49-6)
    Language English
    Publishing date 2019-05-15
    Publishing country United States
    Document type Journal Article ; Research Support, N.I.H., Extramural ; Research Support, Non-U.S. Gov't
    ISSN 1554-8937
    ISSN (online) 1554-8937
    DOI 10.1021/acschembio.9b00325
    Database MEDical Literature Analysis and Retrieval System OnLINE

    More links

    Kategorien

To top