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13 results on '"Equipe de Chimie Organique et Biologie Structurale (ECOBS)"'

1. Peptidoglycan potentiates the membrane disrupting effect of the carboxyamidated form of DMS-DA6, a Gram-positive selective antimicrobial peptide isolated from Pachymedusa dacnicolor skin

Author

Cardon, Sébastien, Sachon, Emmanuelle, Carlier, Ludovic, Drujon, Thierry, Walrant, Astrid, Alemán-Navarro, Estefanía, Martínez-Osorio, Verónica, Guianvarc'H, Dominique, Sagan, Sandrine, Fleury, Yannick, Marquant, Rodrigue, Piesse, Christophe, Rosenstein, Yvonne, Auvynet, Constance, Lacombe, Claire, Analyse, Interactions Moléculaires et Cellulaires (LBM-E2), Laboratoire des biomolécules (LBM UMR 7203), Université Pierre et Marie Curie - Paris 6 (UPMC)-Département de Chimie - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Département de Chimie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Pierre et Marie Curie - Paris 6 (UPMC), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA), University of Cambridge [UK] (CAM), Synthèse, Structure et Fonction de Molécules Bioactives (SSFMB), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Universitaire de Biodiversité et Ecologie Microbienne (LUBEM), Université de Brest (UBO), Peptides, glycoconjugués et métaux en biologie (LBM-E1), Ingénierie des protéines, PCR, Interaction Moléculaires [IBPS] (IBPS-IPIM), Institut de Biologie Paris Seine (IBPS), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS), Protéines : biochimie structurale et fonctionnelle (PBSF), Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Laboratoire de Recherche Moléculaire sur les Antibiotiques, Université Pierre et Marie Curie - Paris 6 (UPMC)-IFR58-Université Paris Descartes - Paris 5 (UPD5)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Département de Chimie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Département de Chimie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Département de Chimie - ENS Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Chimie Moléculaire de Paris Centre (FR 2769), Institut de Chimie du CNRS (INC)-École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Paris - Chimie ParisTech-PSL (ENSCP), Université Paris sciences et lettres (PSL)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Département de Chimie - ENS Paris, École normale supérieure - Paris (ENS Paris)-École normale supérieure - Paris (ENS Paris)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), Chimie Moléculaire de Paris Centre (FR 2769), Université Pierre et Marie Curie - Paris 6 (UPMC)-ESPCI ParisTech-Ecole Nationale Supérieure de Chimie de Paris- Chimie ParisTech-PSL (ENSCP)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Université Pierre et Marie Curie - Paris 6 (UPMC)-ESPCI ParisTech-Ecole Nationale Supérieure de Chimie de Paris- Chimie ParisTech-PSL (ENSCP)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris)-Département de Chimie - ENS Paris, and École normale supérieure - Paris (ENS Paris)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Magnetic Resonance Spectroscopy, Polymers, Staphylococcus, [SDV]Life Sciences [q-bio], Enterococcus faecium, lcsh:Medicine, Pathology and Laboratory Medicine, Biochemistry, Medicine and Health Sciences, Staphylococcus Aureus, lcsh:Science, Materials, Phospholipids, Skin, Antimicrobials, Circular Dichroism, Gram Positive Bacteria, Eukaryota, Drugs, Drug Synergism, Lipids, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biomolecules [q-bio.BM], Bacterial Pathogens, [SDV.BBM.BP]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biophysics, Chemistry, Macromolecules, Medical Microbiology, Physical Sciences, Vertebrates, Frogs, Anura, Pathogens, Cellular Structures and Organelles, Research Article, Materials Science, Microbial Sensitivity Tests, Peptidoglycan, Microbiology, Amphibian Proteins, Amphibians, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Microbial Control, Animals, Humans, Vesicles, [SDV.BBM.BC]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Biochemistry [q-bio.BM], Microbial Pathogens, Pharmacology, Membranes, Bacteria, lcsh:R, Organisms, Biology and Life Sciences, Bacteriology, Cell Biology, Peptidoglycans, Polymer Chemistry, A549 Cells, Antibacterials, lcsh:Q, Antimicrobial Cationic Peptides
Abstract

International audience; The occurrence of nosocomial infections has been on the rise for the past twenty years. Notably, infections caused by the Gram-positive bacteria Staphylococcus aureus represent a major clinical problem, as an increase in antibiotic multi-resistant strains has accompanied this rise. There is thus a crucial need to find and characterize new antibiotics against Gram-positive bacteria, and against antibiotic-resistant strains in general. We identified a new der-maseptin, DMS-DA6, produced by the skin of the Mexican frog Pachymedusa dacnicolor, with specific antibacterial activity against Gram-positive bacteria. This peptide is particularly effective against two multiple drug-resistant strains Enterococcus faecium BM4147 and Staphylococcus aureus DAR5829, and has no hemolytic activity. DMS-DA6 is naturally produced with the C-terminal carboxyl group in either the free or amide forms. By using Gram-positive model membranes and different experimental approaches, we showed that both forms of the peptide adopt an α-helical fold and have the same ability to insert into, and to disorganize a membrane composed of anionic lipids. However, the bactericidal capacity of DMS-DA6-NH 2 was consistently more potent than that of DMS-DA6-OH. Remarkably, rather than resulting from the interaction with the negatively charged lipids of the membrane, or from a more stable conformation towards proteolysis, the increased capacity to permeabi-lize the membrane of Gram-positive bacteria of the carboxyamidated form of DMS-DA6 was found to result from its enhanced ability to interact with peptidoglycan. PLOS ONE | https://doi.org/10.1371/journal.pone.

Published
2018
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2. Synthesis and structural characterization of a liquid polyisoprene bearing amidoxime end groups

Author

Vitaly Boiko, Claude Bunel, Fabrice Burel, V. K. Grishchenko, Antonina Barantsova, Hassan Oulyadi, Natalya Busko, Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Polymères, biopolymères, membranes (PBM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), and Normandie Université (NU)

Subjects
Steric effects, Materials science, Polymers and Plastics, Radical polymerization, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, Gel permeation chromatography, chemistry.chemical_compound, [CHIM.ANAL]Chemical Sciences/Analytical chemistry, Polymer chemistry, Materials Chemistry, Organic chemistry, ComputingMilieux_MISCELLANEOUS, Isoprene, chemistry.chemical_classification, Organic Chemistry, Polymer, 021001 nanoscience & nanotechnology, 0104 chemical sciences, Characterization (materials science), [CHIM.POLY]Chemical Sciences/Polymers, chemistry, Liquid rubber, 0210 nano-technology, Two-dimensional nuclear magnetic resonance spectroscopy
Abstract

Azo-bis(isobutyroamidoxime) was synthesized and used as functionalized initiator to prepare a liquid isoprene bearing amidoxime end groups via radical polymerization. The polymer was characterized by FT-IR, Gel Permeation Chromatography and NMR. In particular, the structure of the polymer was investigated using 1D and 2D NMR techniques. The distribution of the different isoprene units (1,4-trans, 1,4-cis, 1,2 and 3,4), as well as the structure of the amidoxime end-groups was determined. It was found that the structure of the end groups was governed by the steric hindrance of the initiator. Only 1,4 and 4,1 functionalized end units were evidenced, with a majority of 4,1 end units.

Published
2011
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3. Structure–activity relationships of urotensin II and URP

Author

Hubert Vaudry, David Chatenet, Daniel Davoust, Pierre Pacaud, Christophe Dubessy, Laure Guilhaudis, Alain Fournier, Bruno Pfeiffer, Hassan Oulyadi, Marie-Christine Tonon, Jérôme Leprince, Pierre Renard, Elizabeth Scalbert, Isabelle Ségalas-Milazzo, Neuroendocrinologie cellulaire et moléculaire, Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Différenciation et communication neuronale et neuroendocrine (DC2N), Institut Armand Frappier (INRS-IAF), Institut National de la Recherche Scientifique [Québec] (INRS)-Réseau International des Instituts Pasteur (RIIP), Montreal Heart Institute (MONTREAL HEART INSTITUTE), Les Laboratoires SERVIER, Institut de Recherche Servier, unité de recherche de l'institut du thorax UMR1087 UMR6291 (ITX), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université de Nantes - UFR de Médecine et des Techniques Médicales (UFR MEDECINE), Université de Nantes (UN)-Université de Nantes (UN), Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)

Subjects
Protein Conformation, Physiology, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Peptide Hormones, Peptide, Endogeny, MESH: Amino Acid Sequence, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, Biochemistry, MESH: Tyrosine, chemistry.chemical_compound, MESH: Protein Conformation, MESH: Structure-Activity Relationship, 0302 clinical medicine, Endocrinology, [SDV.BC.IC]Life Sciences [q-bio]/Cellular Biology/Cell Behavior [q-bio.CB], MESH: Animals, Disulfides, MESH: Peptide Fragments, Receptor, chemistry.chemical_classification, 0303 health sciences, Alanine, Molecular Structure, Biological activity, 3. Good health, Amino acid, MESH: Alanine, Urotensins, MESH: Molecular Structure, Molecular Sequence Data, MESH: Sequence Alignment, Structure-Activity Relationship, 03 medical and health sciences, Cellular and Molecular Neuroscience, Animals, Humans, Structure–activity relationship, MESH: Disulfides, Amino Acid Sequence, Cysteine, 030304 developmental biology, MESH: Humans, MESH: Molecular Sequence Data, MESH: Urotensins, Rational design, MESH: Cysteine, Peptide Fragments, chemistry, [SDV.SP.PHARMA]Life Sciences [q-bio]/Pharmaceutical sciences/Pharmacology, MESH: Peptide Hormones, Tyrosine, Urotensin-II, Sequence Alignment, 030217 neurology & neurosurgery
Abstract

International audience; Urotensin II (U-II) and urotensin II-related peptide (URP) are the endogenous ligands for the orphan G-protein-coupled receptor GPR14 now renamed UT. At the periphery, U-II and/or URP exert a wide range of biological effects on cardiovascular tissues, airway smooth muscles, kidney and endocrine glands, while central administration of U-II elicits various behavioral and cardiovascular responses. There is also evidence that U-II and/or URP may be involved in a number of pathological conditions including heart failure, atherosclerosis, renal dysfunction and diabetes. Because of the potential involvement of the urotensinergic system in various physiopathological processes, there is need for the rational design of potent and selective ligands for the UT receptor. Structure-activity relationship studies have shown that the minimal sequence required to retain full biological activity is the conserved U-II(4-11) domain, in particular the Cys5 and Cys10 residues involved in the disulfide bridge, and the Phe6, Lys8 and Tyr9 residues. Free alpha-amino group and C-terminal COOH group are not necessary for the biological activity, and modifications of these radicals may even increase the stability of the analogs. Punctual substitution of native amino acids, notably Phe6 and Trp7, by particular residues generates analogs with antagonistic properties. These studies, which provide crucial information regarding the structural and conformational requirements for ligand-receptor interactions, will be of considerable importance for the design of novel UT ligands with increased selectivity, potency and stability, that may eventually lead to the development of innovative drugs.

Published
2008
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4. Structure of the MutL$\alpha$ C-terminal domain reveals how Mlh1 contributes to Pms1 endonuclease site

Author

Bernard Gilquin, Floriana Londino, Josan A Márquez, Pierre Bonnesoeur, Claudine Dherin, Serge Boiteux, Marie-Hélène Le Du, Carine Tellier-Lebegue, Muriel Gondry, Jean-Baptiste Charbonnier, Pierre Legrand, Mireille Moutiez, Cathy Quemener, Emeric Gueneau, Laboratoire de Biologie Structurale et Radiobiologie (LBSR), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Radiobiologie moléculaire et cellulaire (RMC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), Synchrotron SOLEIL (SSOLEIL), Centre National de la Recherche Scientifique (CNRS), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Systèmes membranaires, photobiologie, stress et détoxification (SMPSD - UMR 8221), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut de Biologie et de Technologies de Saclay (IBITECS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de biophysique moléculaire (CBM), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), European Project: 227764,EC:FP7:INFRA,FP7-INFRASTRUCTURES-2008-1,PCUBE(2009), Université d'Orléans (UO)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), and Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)

Subjects
Models, Molecular, congenital, hereditary, and neonatal diseases and abnormalities, HMG-box, Saccharomyces cerevisiae, MLH1, Protein Structure, Secondary, 03 medical and health sciences, Endonuclease, 0302 clinical medicine, Protein structure, MutL Proteins, Structural Biology, Humans, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology, Molecular Biology, neoplasms, Adaptor Proteins, Signal Transducing, 030304 developmental biology, Genetics, 0303 health sciences, biology, Chemistry, Nuclear Proteins, nutritional and metabolic diseases, Endonucleases, biology.organism_classification, digestive system diseases, DNA Repair Enzymes, 030220 oncology & carcinogenesis, biology.protein, MutL Protein Homolog 1, Homologous recombination
Abstract

International audience; Mismatch-repair factors have a prominent role in surveying eukaryotic DNA-replication fidelity and in ensuring correct meiotic recombination. These functions depend on MutL-homolog heterodimers with Mlh1. In humans, MLH1 mutations underlie half of hereditary nonpolyposis colorectal cancers (HNPCCs). Here we report crystal structures of the MutLα (Mlh1-Pms1 heterodimer) C-terminal domain (CTD) from $Saccharomyces\ cerevisiae$, alone and in complex with fragments derived from Mlh1 partners. These structures reveal structural rearrangements and additional domains in MutLα as compared to the bacterial MutL counterparts and show that the strictly conserved C terminus of Mlh1 forms part of the Pms1 endonuclease site. The structures of the ternary complexes between MutLα(CTD) and Exo1 or Ntg2 fragments reveal the binding mode of the MIP-box motif shared by several Mlh1 partners. Finally, the structures provide a rationale for the deleterious impact of MLH1 mutations in HNPCCs.

Published
2013
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5. The C-terminal domain of the Uup protein is a DNA-binding coiled coil motif

Author

Olivier Lequin, Elie Dassa, A. Sander Haase, Ludovic Carlier, Monica Y. Burgos Zepeda, Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Université Pierre et Marie Curie - Paris 6 (UPMC), Membranes bactériennes, Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS), Synthèse, Structure et Fonction de Molécules Bioactives (SSFMB), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS)

Subjects
DNA, Bacterial, Models, Molecular, Subfamily, Magnetic Resonance Spectroscopy, Stereochemistry, 030303 biophysics, Molecular Sequence Data, Biology, Antiparallel (biochemistry), DNA-binding protein, Protein Structure, Secondary, 03 medical and health sciences, chemistry.chemical_compound, Structural Biology, Escherichia coli, A-DNA, Amino Acid Sequence, 030304 developmental biology, Coiled coil, 0303 health sciences, Binding Sites, [CHIM.ORGA]Chemical Sciences/Organic chemistry, C-terminus, Escherichia coli Proteins, Protein Structure, Tertiary, DNA-Binding Proteins, Biochemistry, chemistry, Structural Homology, Protein, ATP-Binding Cassette Transporters, CTD, Hydrophobic and Hydrophilic Interactions, Sequence Alignment, DNA, Protein Binding
Abstract

International audience; The bacterial Uup protein belongs to the REG subfamily of soluble ATP-binding cassette (ABC) ATPases, and is implicated in precise excision of transposons. In Escherichia coli, the uup gene encodes a 72kDa polypeptide that comprises two ABC domains, separated by a linker region, and a 12kDa C-terminal domain (CTD). Uup binds double-stranded DNA with no sequence specificity, and we previously demonstrated that the CTD domain is a crucial region that participates in DNA-binding activity. We report herein the NMR structure of Uup CTD, consisting of an intramolecular antiparallel two-stranded coiled coil motif. Structural comparison with analogous coiled coil domains reveals that Uup CTD contains an atypical 3(10)-helix in the α-hairpin region that contributes to the hydrophobic core. Using NMR titration experiments, we identified residues of the CTD domain involved in the binding to double-stranded DNA. These residues are located on two opposite surfaces at the base of the coiled coil, formed by the N- and C-terminal extremities, where a strictly conserved proline residue induces an overwinding of the coiled coil. Finally, preliminary analysis of NMR spectra recorded on distinct Uup constructs precludes a fully flexible positioning of the CTD domain in full-length Uup. These structural data are the first reported for a non-ATPase domain within ABC REG subfamily.

Published
2012
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6. Secondary structure and NMR resonance assignments of the C-terminal DNA-binding domain of Uup protein

Author

Ludovic Carlier, Elie Dassa, Monica Y. Burgos Zepeda, A. Sander Haase, Olivier Lequin, Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Université Pierre et Marie Curie - Paris 6 (UPMC), Membranes bactériennes, Institut Pasteur [Paris] (IP)-Centre National de la Recherche Scientifique (CNRS), Synthèse, Structure et Fonction de Molécules Bioactives (SSFMB), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Institut Pasteur [Paris]-Centre National de la Recherche Scientifique (CNRS)

Subjects
DNA repair, Biology, Biochemistry, Protein Structure, Secondary, 03 medical and health sciences, chemistry.chemical_compound, Structural Biology, ATP hydrolysis, Tn10, Amino Acid Sequence, Nuclear Magnetic Resonance, Biomolecular, Protein secondary structure, 030304 developmental biology, Coiled coil, 0303 health sciences, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Escherichia coli Proteins, 030302 biochemistry & molecular biology, DNA-binding domain, Nuclear magnetic resonance spectroscopy, Protein Structure, Tertiary, DNA-Binding Proteins, chemistry, ATP-Binding Cassette Transporters, DNA
Abstract

International audience; ATP-binding cassette (ABC) systems belong to a large superfamily of proteins that couple the energy released from ATP hydrolysis to a wide variety of cellular processes, including not only transport of various molecules, but also gene regulation, and DNA repair. Mutations in the bacterial uup gene, which encodes a cytosolic ABC ATPase, lead to an increase in the frequency of precise excision of transposons Tn10 and Tn5, suggesting a role of the Uup protein in DNA metabolism. Uup is a 72 kDa polypeptide which comprises two ABC domains, separated by a 75-residue linker, and a C-terminal domain (CTD) of unknown function. The Uup protein from Escherichia coli has been shown to bind DNA in vitro, and the CTD domain contributes to the DNA-binding affinity. We have produced and purified uniformly labeled (15)N- and (15)N/(13)C Uup CTD domain (region 528-635), and assigned backbone and side-chains resonances using heteronuclear NMR spectroscopy. Secondary structure evaluation based on backbone chemical shifts is consistent with the presence of three α-helices, including two long ones (residues 564-590 and 601-632), suggesting that Uup CTD may fold as an intramolecular coiled coil motif. This work provides the starting point towards determining the first atomic structure of a non-ATPase domain within the vast REG subfamily of ABC soluble ATPases.

Published
2012
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7. NMR resonance assignments of NarE, a putative ADP-ribosylating toxin from Neisseria meningitidis

Author

Carlier, L.P.A., Köhler, Christian, Veggi, D., Pizza, M., Soriani, M., Boelens, R., Bonvin, A.M.J.J., NMR Spectroscopy, Sub NMR Spectroscopy, Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Université Pierre et Marie Curie - Paris 6 (UPMC), NMR Spectroscopy, and Sub NMR Spectroscopy

Subjects
030303 biophysics, Bacterial Toxins, Molecular Sequence Data, ADP Ribose Transferases, Biology, Neisseria meningitidis, medicine.disease_cause, Biochemistry, Protein Structure, Secondary, Article, 03 medical and health sciences, chemistry.chemical_compound, Structural Biology, medicine, NarE, Meningitis, Amino Acid Sequence, Peptide sequence, Nuclear Magnetic Resonance, Biomolecular, 030304 developmental biology, 0303 health sciences, Adenosine Diphosphate Ribose, Adenosine diphosphate ribose, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Nuclear magnetic resonance spectroscopy, NMR, Heteronuclear molecule, chemistry, ADP ribosylation, ADP-ribosylation, Pathogenic bacteria, Target protein
Abstract

International audience; NarE is a 16 kDa protein identified from Neisseria meningitidis, one of the bacterial pathogens responsible for meningitis. NarE belongs to the ADP-ribosyltransferase family and catalyses the transfer of ADP-ribose moieties to arginine residues in target protein acceptors. Many pathogenic bacteria utilize ADP-ribosylating toxins to modify and alter essential functions of eukaryotic cells. NarE was proposed to bind iron through a Fe-S center which is supposed to be implied in catalysis. We have produced and purified uniformly labeled (15)N- and (15)N/(13)C-NarE and assigned backbone and side-chain resonances using multidimensional heteronuclear NMR spectroscopy. These assignments provide the starting point for the three-dimensional structure determination of NarE and the characterization of the role of the Fe-S center in the catalytic mechanism.

Published
2011
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8. Structural and pharmacological characteristics of chimeric peptides derived from peptide E and beta-endorphin reveal the crucial role of the C-terminal YGGFL and YKKGE motifs in their analgesic properties

Author

Jérôme Leprince, Hubert Vaudry, Karine Courchay, Catherine Mayer, Jean-Claude do Rego, Jean Costentin, Daniel Davoust, Eric Condamine, Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), Différenciation et communication neuronale et neuroendocrine (DC2N), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)

Subjects
Male, Circular dichroism, Magnetic Resonance Spectroscopy, Physiology, Amino Acid Motifs, Molecular Sequence Data, Pain, Peptide, 010402 general chemistry, 01 natural sciences, Biochemistry, 03 medical and health sciences, Cellular and Molecular Neuroscience, Mice, Structure-Activity Relationship, Endocrinology, Proopiomelanocortin, Animals, Amino Acid Sequence, Opioid peptide, Receptor, Peptide sequence, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, Analgesics, biology, Chemistry, [CHIM.ORGA]Chemical Sciences/Organic chemistry, Circular Dichroism, beta-Endorphin, Enkephalins, Random coil, 0104 chemical sciences, biology.protein, Peptides, Alpha helix
Abstract

International audience; Peptide E (a 25-amino acid peptide derived from proenkephalin A) and beta-endorphin (a 31-amino acid peptide derived from proopiomelanocortin) bind with high affinity to opioid receptors and share structural similarities but induce analgesic effects of very different intensity. Indeed, whereas they possess the same N-terminus Met-enkephalin message sequence linked to a helix by a flexible spacer and a C-terminal part in random coil conformation, in contrast with peptide E, beta-endorphin produces a profound analgesia. To determine the key structural elements explaining this very divergent opioid activity, we have compared the structural and pharmacological characteristics of several chimeric peptides derived from peptide E and beta-endorphin. Structures were obtained under the same experimental conditions using circular dichroism, computational estimation of helical content and/or nuclear magnetic resonance spectroscopy (NMR) and NMR-restrained molecular modeling. The hot-plate and writhing tests were used in mice to evaluate the antinociceptive effects of the peptides. Our results indicate that neither the length nor the physicochemical profile of the spacer plays a fundamental role in analgesia. On the other hand, while the functional importance of the helix cannot be excluded, the last 5 residues in the C-terminal part seem to be crucial for the expression or absence of the analgesic activity of these peptides. These data raise the question of the true function of peptides E in opioidergic systems.

Published
2009
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9. Molecular and conformational determinants of pituitary adenylate cyclase-activating polypeptide (PACAP) for activation of the PAC1 receptor

Author

David Vaudry, Steve Bourgault, Marc Laburthe, Isabelle Ségalas-Milazzo, Alain Couvineau, Laure Guilhaudis, Alain Fournier, Hubert Vaudry, Neuroendocrinologie cellulaire et moléculaire, Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut Fédératif de Recherches Multidisciplinaires sur les Peptides (IFRMP 23), Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre de Lutte Contre le Cancer Henri Becquerel Normandie Rouen (CLCC Henri Becquerel)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-CHU Rouen, Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Institut Armand Frappier (INRS-IAF), Institut National de la Recherche Scientifique [Québec] (INRS)-Réseau International des Instituts Pasteur (RIIP), International Associated laboratory Samuel de Champlain, Institut National de la Santé et de la Recherche Médicale (INSERM)-Institut National de la Recherche Scientifique [Québec] (INRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU), Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Centre de recherche biomédicale Bichat-Beaujon (CRB3), Université Paris Diderot - Paris 7 (UPD7)-Institut National de la Santé et de la Recherche Médicale (INSERM), and This work was supported by the Institut National de la Recherche Scientifique, the Institut National de la Santé et de la Recherche Médicale (INSERM U413), the Conseil Régional de Haute-Normandie, the IREB, the IRME, the ANR, and a scientific exchange program from INSERM and the Fonds de la Recherche en Sante' du Que'bec (FRSQ). Parts of these studies were performed with the support of the Platform for Cell Imaging of Haute-Normandie (PRIMACEN). NMR and molecular modeling software facilities were provided by the Centre de Ressources Informatiques de Haute-Normandie

Subjects
Agonist, Magnetic Resonance Spectroscopy, MESH: Amino Acids, Protein Conformation, medicine.drug_class, Adenylate kinase, MESH: Cricetinae, CHO Cells, Cyclase, Turn (biochemistry), Structure-Activity Relationship, 03 medical and health sciences, chemistry.chemical_compound, Cricetulus, 0302 clinical medicine, MESH: Structure-Activity Relationship, MESH: Protein Conformation, MESH: Cricetulus, MESH: CHO Cells, Cricetinae, Drug Discovery, Peptide synthesis, medicine, Animals, MESH: Protein Binding, MESH: Animals, Amino Acids, 030304 developmental biology, G protein-coupled receptor, 0303 health sciences, MESH: Magnetic Resonance Spectroscopy, MESH: Pituitary Adenylate Cyclase-Activating Polypeptide, Pituitary adenylate cyclase-activating peptide, chemistry, Biochemistry, [SDV.TOX]Life Sciences [q-bio]/Toxicology, MESH: Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I, Pituitary Adenylate Cyclase-Activating Polypeptide, Molecular Medicine, Pharmacophore, 030217 neurology & neurosurgery, Protein Binding, Receptors, Pituitary Adenylate Cyclase-Activating Polypeptide, Type I
Abstract

International audience; PAC1 receptor is abundant in the CNS and plays an important role in neuronal survival. To identify the molecular determinants and the conformational components responsible for the activation of the PAC1 receptor, we performed a SAR study focusing on the N-terminal domain of its endogenous ligand, PACAP. This approach revealed that residues Asp(3) and Phe(6) are key elements of the pharmacophore of the PAC1 receptor. This study, supported by NMR structural analyses, suggests that the N-terminal tail of PACAP (residues 1 to 4) adopts a specific conformation similar to a turn when it activates the PAC1 receptor. Moreover, the integrity of the alpha-helix conformation observed at positions 5 to 7 appears crucial to allow the binding of PACAP. Characterization of analogues led to the identification of several superagonists, such as [Bip(6)]PACAP27, and of a new potent PAC1 receptor antagonist, [Sar(4)]PACAP38. The bioactive conformation inferred from this SAR study could constitute an appropriate molecular scaffold supporting the design of nonpeptidic PAC1 receptor agonists.

Published
2009
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10. Characterization of urotensin-II receptor structural domains involved in the recognition of U-II, URP, and urantide

Author

Stéphane Boivin, Isabelle Milazzo, Laure Guilhaudis, Alain Fournier, Daniel Davoust, Hassan Oulyadi, Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Institut Armand Frappier (INRS-IAF), Réseau International des Instituts Pasteur (RIIP)-Institut National de la Recherche Scientifique [Québec] (INRS), and Financial support was obtained from the Canadian Institutes for Health Research (CIHR), the Ministère de l'Education du Québec, and the Région de la Haute Normandie

Subjects
Circular dichroism, Stereochemistry, Peptide Hormones, Urotensins, Molecular Sequence Data, MESH: Protein Structure, Secondary, Peptide, MESH: Amino Acid Sequence, MESH: Receptors, G-Protein-Coupled, Urotensin-II receptor, Biochemistry, Micelle, Protein Structure, Secondary, MESH: Circular Dichroism, Receptors, G-Protein-Coupled, 03 medical and health sciences, Extracellular, Amino Acid Sequence, Surface plasmon resonance, MESH: Peptide Fragments, Receptor, Micelles, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, MESH: Molecular Sequence Data, MESH: Urotensins, Circular Dichroism, 030302 biochemistry & molecular biology, MESH: Micelles, Intracellular Signaling Peptides and Proteins, Surface Plasmon Resonance, Peptide Fragments, MESH: Surface Plasmon Resonance, Transmembrane domain, chemistry, [SDV.TOX]Life Sciences [q-bio]/Toxicology, MESH: Peptide Hormones
Abstract

International audience; Urotensin-II (U-II) and urotensin-II-related peptide (URP) are potent vasoconstrictors, and this action is mediated through a G protein-coupled receptor identified as UT. This receptor is expressed abundantly in the mammalian cardiovasculature, and the effects of U-II and URP can be blocked with urantide, a selective antagonist. Thus, we carried out a study with the aim to characterize the conformational arrangement of the three extracellular loops of UT as well as the transmembrane domains III and IV. Secondary structures of the synthetic receptor fragments were determined using circular dichroism (CD) spectroscopy in a variety of solvent and micelle conditions. Spectra showed that all receptor segments but not the extracellular loop I exhibited a propensity for adopting the alpha-helix folding. Furthermore, using surface plasmon resonance (SPR) technology, we measured the binding affinities of the ligands, U-II, URP, and urantide toward the UT extracellular segments. SPR data showed that both U-II and URP bind extracellular loops II and III with similar affinities, whereas none of these two ligands were able to interact with the extracellular loop I. Moreover, the binding of urantide was observed only with the second extracellular loop. These results imply that U-II and URP but not urantide would bind to UT according to a common pattern. Also, the correlation of the CD spectral information with the affinity data suggested that the adoption of a helical geometry in UT, by extracellular loops II and III, might be essential for favoring the binding of ligands.

Published
2006
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11. Structure and functions of the novel hypothalamic RFamide neuropeptides R-RFa and 26RFa in vertebrates

Author

Chartrel, Nicolas, BRUZZONE, FEDERICA, Leprince, Jérôme, Tollemer, Hélène, Anouar, Youssef, Do-Régo, Jean, Ségalas-Milazzo, Isabelle, Guilhaudis, Laure, Cosette, Pascal, Jouenne, Thierry, Simonnet, Guy, VALLARINO, MAURO, Beauvillain, Jean, Costentin, Jean, Vaudry, Hubert, Do-Régo, Jean-Claude, Beauvillain, Jean-Claude, Différenciation et communication neuronale et neuroendocrine (DC2N), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Neuroendocrinologie cellulaire et moléculaire, Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Polymères Biopolymères Surfaces (PBS), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Polymères, biopolymères, membranes (PBM), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU), UMR 5287, Homéostasie-Allostasie-Pathologie-Réhabilitation, Centre National de la Recherche Scientifique (CNRS), Neuropsycho-pharmacologie expérimentale, Centre National de la Recherche Scientifique (CNRS)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU), Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer - U1172 Inserm - U837 (JPArc), Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Lille Nord de France (COMUE)-Université de Lille, Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Jean-Pierre AUBERT Neurosciences et Cancer - U837 (JPArc), and Université Lille Nord de France (COMUE)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université de Lille

Subjects
Central Nervous System, Receptors, Neuropeptide, Amphibian, Ranidae, Physiology, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Central nervous system, Hypothalamus, Neuropeptide, Peptide, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, MESH: Neuropeptides, Biochemistry, 03 medical and health sciences, Cellular and Molecular Neuroscience, 0302 clinical medicine, Endocrinology, biology.animal, [SDV.BC.IC]Life Sciences [q-bio]/Cellular Biology/Cell Behavior [q-bio.CB], medicine, Animals, Humans, MESH: Central Nervous System, MESH: Animals, Receptor, 030304 developmental biology, chemistry.chemical_classification, 0303 health sciences, MESH: Humans, biology, MESH: Ranidae, MESH: Receptors, Neuropeptide, Neuropeptides, Protein primary structure, Vertebrate, MESH: Hypothalamus, Cell biology, medicine.anatomical_structure, chemistry, MESH: Oligopeptides, [SDV.SP.PHARMA]Life Sciences [q-bio]/Pharmaceutical sciences/Pharmacology, Oligopeptides, Neuroscience, 030217 neurology & neurosurgery
Abstract

International audience; A number of RFamide peptides have been characterized in invertebrate species and these peptides have been found to exert a broad spectrum of biological activities. In contrast, in vertebrates, our knowledge on RFamide peptides is far more limited and only a few members of the RFamide peptide family have been identified in various vertebrate classes during the last years. The present review focuses on two novel RFamide peptides, Rana RFamide (R-RFa) and 26RFa, that have been recently isolated from the amphibian brain. R-RFa shares the C-terminal LPLRFamide motif with other RFamide peptides previously identified in mammals, birds and fish. The distribution of R-RFa in the frog brain exhibits strong similarities with those of other LPLRFamide peptides, notably in the periventricular region of the hypothalamus. There is also evidence that the physiological functions of R-RFa and other LPLRFamide peptides have been conserved from fish to mammals; in particular, all these peptides appear to be involved in the control of pituitary hormone secretion. 26RFa does not exhibit any significant structural identity with other RFamide peptides and this peptide is the only member of the family that possesses an FRFamide motif at its C-terminus. The strong conservation of the primary structure of 26RFa from amphibians to mammals suggests that this RFamide peptide is involved in important biological functions in vertebrates. As for several other RFamide peptides, 26RFa-containing neurons are present in the hypothalamus, notably in two nuclei involved in the control of feeding behavior. Indeed, 26RFa is a potent stimulator of appetite in mammals. Concurrently, recent data suggest that 26RFa exerts various neuroendocrine regulatory activities at the pituitary and adrenal level.

Published
2006
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12. Structure–activity relationships and structural conformation of a novel urotensin II-related peptide

Author

Hassan Oulyadi, Cédric Boularan, Pierre Renard, Pierre Pacaud, Isabelle Ségalas-Milazzo, Laure Guilhaudis, Isabelle Lihrmann, David Chatenet, Jérôme Leprince, Christophe Dubessy, Bruno Pfeiffer, Hubert Vaudry, Daniel Davoust, Ludovic Carlier, Elizabeth Scalbert, Marie-Christine Tonon, Institut Armand Frappier (INRS-IAF), Institut National de la Recherche Scientifique [Québec] (INRS)-Réseau International des Instituts Pasteur (RIIP), Différenciation et communication neuronale et neuroendocrine (DC2N), Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Normandie Université (NU)-Institut National de la Santé et de la Recherche Médicale (INSERM), Neuroendocrinologie cellulaire et moléculaire, Université de Nantes (UN), Université de Picardie Jules Verne (UPJV), Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Institut de recherches Servier (INSTITUT DE RECHERCHES SERVIER), INSTITUT SERVIER, Les Laboratoires SERVIER, Institut de Recherche Servier, Institut du thorax, and Université de Nantes (UN)-IFR26-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
Models, Molecular, Protein Conformation, Physiology, Stereochemistry, Peptide Hormones, [SDV.NEU.NB]Life Sciences [q-bio]/Neurons and Cognition [q-bio.NC]/Neurobiology, Molecular Sequence Data, Peptide, MESH: Amino Acid Sequence, [CHIM.THER]Chemical Sciences/Medicinal Chemistry, Urotensin-II receptor, Biochemistry, 03 medical and health sciences, Cellular and Molecular Neuroscience, chemistry.chemical_compound, 0302 clinical medicine, Endocrinology, MESH: Protein Conformation, [SDV.BC.IC]Life Sciences [q-bio]/Cellular Biology/Cell Behavior [q-bio.CB], Animals, Humans, MESH: Animals, Amino Acid Sequence, Receptor, MESH: Peptide Fragments, MESH: Organ Specificity, 030304 developmental biology, chemistry.chemical_classification, Alanine, 0303 health sciences, MESH: Humans, MESH: Molecular Sequence Data, Intracellular Signaling Peptides and Proteins, Rational design, Antagonist, Biological activity, Peptide Fragments, 3. Good health, chemistry, Organ Specificity, [SDV.SP.PHARMA]Life Sciences [q-bio]/Pharmaceutical sciences/Pharmacology, MESH: Peptide Hormones, Urotensin-II, 030217 neurology & neurosurgery, MESH: Models, Molecular
Abstract

Urotensin II (UII) has been described as the most potent vasoconstrictor peptide and recognized as the endogenous ligand of the orphan G protein-coupled receptor GPR14. Recently, a UII-related peptide (URP) has been isolated from the rat brain and its sequence has been established as H-Ala- Cys-Phe-Trp-Lys-Tyr-Cys- Val-OH. In order to study the structure–function relationships of URP, we have synthesized a series of URP analogs and measured their binding affinity on h GPR14-transfected cells and their contractile activity in a rat aortic ring bioassay. Alanine substitution of each residue of URP significantly reduced the binding affinity and the contractile activity of the peptides, except for the Ala 8 -substituted analog that retained biological activity. Most importantly, d -scan of URP revealed that [ d -Trp 4 ]URP abrogated and [ d -Tyr 6 ]URP partially suppressed the UII-evoked contractile response. [Orn 5 ]URP, which had very low agonistic efficacy, was the most potent antagonist in this series. The solution structure of URP has been determined by 1 H NMR spectroscopy and molecular dynamics. URP exhibited a single conformation characterized by an inverse γ-turn comprising residues Trp-Lys-Tyr which plays a crucial role in the biological activity of URP. These pharmacological and structural data should prove useful for the rational design of non-peptide ligands as potential GPR14 agonists and antagonists.

Published
2004
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13. A NMR and Theoretical Study of the Aggregates between Alkyllithium and Chiral Lithium Amides: Control of the Topology through a Single Asymmetric Center

Author

Henri Houte, Stéphanie Desjardins, Anne Harrison-Marchand, Catherine Fressigné, Daniel Davoust, Hassan Oulyadi, Jean-Yves Valnot, Jacques Maddaluno, Marie-Claire Lasne, Aline Corruble, Claude Giessner-Prettre, Chimie Organique et Bioorganique : Réactivité et Analyse (COBRA), Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Université de Rouen Normandie (UNIROUEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie Organique Fine (IRCOF), Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Equipe de Chimie Organique et Biologie Structurale (ECOBS), Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Normandie Université (NU), Laboratoire de chimie théorique (LCT), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de chimie moléculaire et thioorganique (LCMT), Centre National de la Recherche Scientifique (CNRS)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Normandie Université (NU), Institut de Chimie Organique Fine (IRCOF), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Université de Rouen Normandie (UNIROUEN), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Centre National de la Recherche Scientifique (CNRS)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Université Le Havre Normandie (ULH), Normandie Université (NU)-Institut national des sciences appliquées Rouen Normandie (INSA Rouen Normandie), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université de Caen Normandie (UNICAEN), Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut Normand de Chimie Moléculaire Médicinale et Macromoléculaire (INC3M), Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Université Le Havre Normandie (ULH), and Institut National des Sciences Appliquées (INSA)-Normandie Université (NU)-Institut National des Sciences Appliquées (INSA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
010405 organic chemistry, Stereochemistry, Isotopes of lithium, Enantioselective synthesis, Diastereomer, chemistry.chemical_element, General Chemistry, Alkylation, 010402 general chemistry, Ring (chemistry), Topology, 01 natural sciences, Biochemistry, Catalysis, Pyrrolidine, 0104 chemical sciences, chemistry.chemical_compound, Colloid and Surface Chemistry, chemistry, [CHIM]Chemical Sciences, Lithium, Methyllithium
Abstract

International audience; The complexes between methyllithium and chiral 3-aminopyrrolidine (3-AP) lithium amides bearing a second asymmetric center on their lateral amino group were studied using multinuclear (1H, 6Li, 13C, 15N) low-temperature NMR spectroscopies in tetrahydrofuran-d8. The results indicate that lithium chelation forces the pyrrolidine ring of the 3-AP to adopt a norbornyl-like conformation and that robust 1:1 noncovalent complexes between methyllithium and 3-AP lithium amides form in the medium. A set of 1H-1H and 1H-6Li NMR cross-coupling correlations shows that the binding of methyllithium can take place along the “exo” or the “endo” face of this puckered structure, depending on the relative configuration of the lateral chiral group. This aggregation step renders the nitrogen of the 3-amino group chiral, the “exo” and “endo” topologies corresponding to the (S) and (R) configurations, respectively, of this atom. Density functional theory calculations show that the “exo” and “endo” arrangements are, for both diastereomers, almost isoenergetic even when solvent is taken into account. This result suggests that the formation of the mixed aggregates is under strict kinetic control. A relationship between the topology of these complexes and the sense of induction in the enantioselective alkylation of aromatic aldehydes by alkyllithiums is proposed.

Published
2002
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