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De San Nicolas N, Asokan A, Rosa RD, Voisin SN, Travers MA, Rocha G, Dantan L, Dorant Y, Mitta G, Petton B, Charrière GM, Escoubas JM, Boulo V, Pouzadoux J, Meudal H, Loth K, Aucagne V, Delmas AF, Bulet P, Montagnani C, Destoumieux-Garzón D. Functional Diversification of Oyster Big Defensins Generates Antimicrobial Specificity and Synergy against Members of the Microbiota. Mar Drugs 2022; 20:md20120745. [PMID: 36547892 PMCID: PMC9786018 DOI: 10.3390/md20120745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 11/18/2022] [Accepted: 11/22/2022] [Indexed: 11/29/2022] Open
Abstract
Big defensins are two-domain antimicrobial peptides (AMPs) that have highly diversified in mollusks. Cg-BigDefs are expressed by immune cells in the oyster Crassostrea gigas, and their expression is dampened during the Pacific Oyster Mortality Syndrome (POMS), which evolves toward fatal bacteremia. We evaluated whether Cg-BigDefs contribute to the control of oyster-associated microbial communities. Two Cg-BigDefs that are representative of molecular diversity within the peptide family, namely Cg-BigDef1 and Cg-BigDef5, were characterized by gene cloning and synthesized by solid-phase peptide synthesis and native chemical ligation. Synthetic peptides were tested for antibacterial activity against a collection of culturable bacteria belonging to the oyster microbiota, characterized by 16S sequencing and MALDI Biotyping. We first tested the potential of Cg-BigDefs to control the oyster microbiota by injecting synthetic Cg-BigDef1 into oyster tissues and analyzing microbiota dynamics over 24 h by 16S metabarcoding. Cg-BigDef1 induced a significant shift in oyster microbiota β-diversity after 6 h and 24 h, prompting us to investigate antimicrobial activities in vitro against members of the oyster microbiota. Both Cg-BigDef1 and Cg-BigDef5 were active at a high salt concentration (400 mM NaCl) and showed broad spectra of activity against bacteria associated with C. gigas pathologies. Antimicrobial specificity was observed for both molecules at an intra- and inter-genera level. Remarkably, antimicrobial spectra of Cg-BigDef1 and Cg-BigDef5 were complementary, and peptides acted synergistically. Overall, we found that primary sequence diversification of Cg-BigDefs has generated specificity and synergy and extended the spectrum of activity of this peptide family.
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Affiliation(s)
- Noémie De San Nicolas
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Aromal Asokan
- Centre de Biophysique Moléculaire UPR4301 CNRS, 45071 Orléans, France
| | - Rafael D. Rosa
- Laboratory of Immunology Applied to Aquaculture, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, Florianópolis 88040-900, SC, Brazil
| | | | - Marie-Agnès Travers
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Gustavo Rocha
- Laboratory of Immunology Applied to Aquaculture, Department of Cell Biology, Embryology and Genetics, Federal University of Santa Catarina, Florianópolis 88040-900, SC, Brazil
| | - Luc Dantan
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Yann Dorant
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Guillaume Mitta
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
- Ifremer, IRD, ILM, Université de Polynésie Française, UMR EIO, Vairao 98179, French Polynesia
| | - Bruno Petton
- Ifremer, CNRS, IRD, Ifremer, LEMAR UMR 6539, Université de Bretagne Occidentale, 29840 Argenton-en-Landunvez, France
| | - Guillaume M. Charrière
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Jean-Michel Escoubas
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Viviane Boulo
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Juliette Pouzadoux
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Hervé Meudal
- Centre de Biophysique Moléculaire UPR4301 CNRS, 45071 Orléans, France
| | - Karine Loth
- Centre de Biophysique Moléculaire UPR4301 CNRS, 45071 Orléans, France
- UFR ST, Université d’Orléans, 45067 Orléans, France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire UPR4301 CNRS, 45071 Orléans, France
| | - Agnès F. Delmas
- Centre de Biophysique Moléculaire UPR4301 CNRS, 45071 Orléans, France
| | - Philippe Bulet
- Plateforme BioPark d’Archamps, Archparc, 74160 Archamps, France
- CR UGA, IAB, INSERM U1209, CNRS UMR5309, 74160 La Tronche-Archamps, France
| | - Caroline Montagnani
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
| | - Delphine Destoumieux-Garzón
- IHPE, University Montpellier, CNRS, Ifremer, University Perpignan Via Domitia, 34090 Montpellier, France
- Correspondence: ; Tel.: +33-467144625
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Loth K, Parisot N, Paquet F, Terrasson H, Sivignon C, Rahioui I, Ribeiro Lopes M, Gaget K, Duport G, Delmas AF, Aucagne V, Heddi A, Calevro F, da Silva P. Aphid BCR4 Structure and Activity Uncover a New Defensin Peptide Superfamily. Int J Mol Sci 2022; 23:ijms232012480. [PMID: 36293341 PMCID: PMC9604261 DOI: 10.3390/ijms232012480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2022] [Revised: 10/11/2022] [Accepted: 10/12/2022] [Indexed: 11/24/2022] Open
Abstract
Aphids (Hemiptera: Aphidoidea) are among the most detrimental insects for agricultural plants, and their management is a great challenge in agronomical research. A new class of proteins, called Bacteriocyte-specific Cysteine-Rich (BCR) peptides, provides an alternative to chemical insecticides for pest control. BCRs were initially identified in the pea aphid Acyrthosiphon pisum. They are small disulfide bond-rich proteins expressed exclusively in aphid bacteriocytes, the insect cells that host intracellular symbiotic bacteria. Here, we show that one of the A. pisum BCRs, BCR4, displays prominent insecticidal activity against the pea aphid, impairing insect survival and nymphal growth, providing evidence for its potential use as a new biopesticide. Our comparative genomics and phylogenetic analyses indicate that BCRs are restricted to the aphid lineage. The 3D structure of BCR4 reveals that this peptide belongs to an as-yet-unknown structural class of peptides and defines a new superfamily of defensins.
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Affiliation(s)
- Karine Loth
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans, France
- UFR Sciences et Techniques, Université d’Orléans, 45071 Orléans, France
| | - Nicolas Parisot
- Univ Lyon, INSA Lyon, INRAE, BF2I, UMR 203, 69621 Villeurbanne, France
| | - Françoise Paquet
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans, France
| | - Hugo Terrasson
- Univ Lyon, INSA Lyon, INRAE, BF2I, UMR 203, 69621 Villeurbanne, France
| | | | - Isabelle Rahioui
- Univ Lyon, INRAE, INSA Lyon, BF2I, UMR 203, 69621 Villeurbanne, France
| | | | - Karen Gaget
- Univ Lyon, INRAE, INSA Lyon, BF2I, UMR 203, 69621 Villeurbanne, France
| | - Gabrielle Duport
- Univ Lyon, INRAE, INSA Lyon, BF2I, UMR 203, 69621 Villeurbanne, France
| | - Agnès F. Delmas
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans, France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire, CNRS UPR 4301, 45071 Orléans, France
| | - Abdelaziz Heddi
- Univ Lyon, INSA Lyon, INRAE, BF2I, UMR 203, 69621 Villeurbanne, France
| | - Federica Calevro
- Univ Lyon, INRAE, INSA Lyon, BF2I, UMR 203, 69621 Villeurbanne, France
| | - Pedro da Silva
- Univ Lyon, INSA Lyon, INRAE, BF2I, UMR 203, 69621 Villeurbanne, France
- Correspondence:
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Loth K, Largillière J, Coste F, Culard F, Landon C, Castaing B, Delmas AF, Paquet F. New protein-DNA complexes in archaea: a small monomeric protein induces a sharp V-turn DNA structure. Sci Rep 2019; 9:14253. [PMID: 31582767 PMCID: PMC6776556 DOI: 10.1038/s41598-019-50211-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Accepted: 09/05/2019] [Indexed: 01/02/2023] Open
Abstract
MC1, a monomeric nucleoid-associated protein (NAP), is structurally unrelated to other DNA-binding proteins. The protein participates in the genome organization of several Euryarchaea species through an atypical compaction mechanism. It is also involved in DNA transcription and cellular division through unknown mechanisms. We determined the 3D solution structure of a new DNA-protein complex formed by MC1 and a strongly distorted 15 base pairs DNA. While the protein just needs to adapt its conformation slightly, the DNA undergoes a dramatic curvature (the first two bend angles of 55° and 70°, respectively) and an impressive torsional stress (dihedral angle of 106°) due to several kinks upon binding of MC1 to its concave side. Thus, it adopts a V-turn structure. For longer DNAs, MC1 stabilizes multiple V-turn conformations in a flexible and dynamic manner. The existence of such V-turn conformations of the MC1-DNA complexes leads us to propose two binding modes of the protein, as a bender (primary binding mode) and as a wrapper (secondary binding mode). Moreover, it opens up new opportunities for studying and understanding the repair, replication and transcription molecular machineries of Archaea.
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Affiliation(s)
- Karine Loth
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France. .,UFR Collegium Sciences et Techniques, Université d'Orléans, rue de Chartres, 45100, Orléans, France.
| | - Justine Largillière
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France
| | - Franck Coste
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France
| | - Françoise Culard
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France
| | - Céline Landon
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France
| | - Bertrand Castaing
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France
| | - Françoise Paquet
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique UPR 4301, rue Charles Sadron, F-45071, Orléans, Cedex 2, France.
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Wartenberg M, Saidi A, Galibert M, Joulin-Giet A, Burlaud-Gaillard J, Lecaille F, Scott CJ, Aucagne V, Delmas AF, Lalmanach G. Imaging of extracellular cathepsin S activity by a selective near infrared fluorescence substrate-based probe. Biochimie 2019; 166:84-93. [PMID: 30914255 DOI: 10.1016/j.biochi.2019.03.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Accepted: 03/19/2019] [Indexed: 02/05/2023]
Abstract
We designed a near-infrared fluorescent substrate-based probe (SBP), termed MG101, for monitoring extracellular cathepsin S (CatS) activity. We conceived a fused peptide hairpin loop-structure, combining a CatS recognition domain, an electrostatic zipper (with complementary charges of a polyanionic (D-Glu)5 segment and a polycationic (D-Arg)5 motif, as well as a N and C terminal Förster resonance energy transfer pair (donor: AlexaFluor680; quencher: BHQ3) to facilitate activity-dependent imaging. MG101 showed excellent stability since no fluorescence release corresponding to a self-dequenching was observed in the presence of either 2 M NaCl or after incubation at a broad range of pH (2.2-8.2). Cathepsins B, D, G, H, and K, neutrophil elastase and proteinase 3 did not cleave MG101, while CatS, and to a lesser extent CatL, hydrolysed MG101 at pH 5.5. However MG101 was fully selective for CatS at pH 7.4 (kcat/Km = 140,000 M-1 s-1) and sensitive to low concentration of CatS (<1 nM). The selectivity of MG101 was successfully endorsed ex vivo, as it was hydrolysed in cell lysates derived from wild-type but not knockout CatS murine spleen. Furthermore, application of the SBP probe with confocal microscopy confirmed the secretion of active CatS from THP-1 macrophages, which could be abrogated by pharmacological CatS inhibitors. Taken together, present data highlight MG101 as a novel near-infrared fluorescent SBP for the visualization of extracellular active CatS from macrophages and other cell types.
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Affiliation(s)
- Mylène Wartenberg
- Université de Tours, Tours, France; INSERM, UMR 1100, Research Center for Respiratory Diseases (CEPR), Team: "Proteolytic Mechanisms in Inflammation", Tours, France
| | - Ahlame Saidi
- Université de Tours, Tours, France; INSERM, UMR 1100, Research Center for Respiratory Diseases (CEPR), Team: "Proteolytic Mechanisms in Inflammation", Tours, France
| | - Mathieu Galibert
- CNRS UPR 4301, Center for Molecular Biophysics (CBM), Team: "Molecular, Structural and Chemical Biology", Orléans, France
| | - Alix Joulin-Giet
- Université de Tours, Tours, France; INSERM, UMR 1100, Research Center for Respiratory Diseases (CEPR), Team: "Proteolytic Mechanisms in Inflammation", Tours, France
| | - Julien Burlaud-Gaillard
- Université de Tours, Tours, France; Plateforme IBiSA de Microscopie Electronique, Université de Tours, Tours, France
| | - Fabien Lecaille
- Université de Tours, Tours, France; INSERM, UMR 1100, Research Center for Respiratory Diseases (CEPR), Team: "Proteolytic Mechanisms in Inflammation", Tours, France
| | - Christopher J Scott
- Centre for Cancer Research and Cell Biology, School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, Northern Ireland, UK
| | - Vincent Aucagne
- CNRS UPR 4301, Center for Molecular Biophysics (CBM), Team: "Molecular, Structural and Chemical Biology", Orléans, France
| | - Agnès F Delmas
- CNRS UPR 4301, Center for Molecular Biophysics (CBM), Team: "Molecular, Structural and Chemical Biology", Orléans, France
| | - Gilles Lalmanach
- Université de Tours, Tours, France; INSERM, UMR 1100, Research Center for Respiratory Diseases (CEPR), Team: "Proteolytic Mechanisms in Inflammation", Tours, France.
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Cieslikiewicz-Bouet M, Eliseeva SV, Aucagne V, Delmas AF, Gillaizeau I, Petoud S. Near-infrared emitting lanthanide(iii) complexes as prototypes of optical imaging agents with peptide targeting ability: a methodological approach. RSC Adv 2019; 9:1747-1751. [PMID: 35518044 PMCID: PMC9059771 DOI: 10.1039/c8ra09419e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Accepted: 01/08/2019] [Indexed: 01/08/2023] Open
Abstract
A methodological approach to design prototypes of specific near-infrared emitting imaging agents based on a small molecular compound combining a lanthanide(iii) ion, the cyclen derivative as a coordinating unit and the azo-dye as a sensitizer with a Arg-Gly-Asp cyclopeptide as a targeting moiety, is presented here. NIR Ln(iii) complexes combining a cyclen derivative, azo-dye as a sensitizer and a cRGD peptide as a targeting moiety.![]()
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Affiliation(s)
| | | | - Vincent Aucagne
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans Cedex 2
- France
| | - Agnès F. Delmas
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans Cedex 2
- France
| | - Isabelle Gillaizeau
- Institut de Chimie Organique et Analytique
- UMR CNRS 7311
- Université d’Orléans
- 45100 Orléans
- France
| | - Stéphane Petoud
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans Cedex 2
- France
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Galibert M, Wartenberg M, Lecaille F, Saidi A, Mavel S, Joulin-Giet A, Korkmaz B, Brömme D, Aucagne V, Delmas AF, Lalmanach G. Substrate-derived triazolo- and azapeptides as inhibitors of cathepsins K and S. Eur J Med Chem 2018; 144:201-210. [DOI: 10.1016/j.ejmech.2017.12.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 11/15/2017] [Accepted: 12/03/2017] [Indexed: 12/17/2022]
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Eyraud V, Balmand S, Karaki L, Rahioui I, Sivignon C, Delmas AF, Royer C, Rahbé Y, Da Silva P, Gressent F. The interaction of the bioinsecticide PA1b (Pea Albumin 1 subunit b) with the insect V-ATPase triggers apoptosis. Sci Rep 2017; 7:4902. [PMID: 28687751 PMCID: PMC5501856 DOI: 10.1038/s41598-017-05315-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2017] [Accepted: 05/26/2017] [Indexed: 11/30/2022] Open
Abstract
PA1b (Pea Albumin 1, subunit b) peptide is an entomotoxin, extracted from Legume seeds, with a lethal activity towards several insect pests, such as mosquitoes, some aphids and cereal weevils. This toxin acts by binding to the subunits c and e of the plasma membrane H+-ATPase (V-ATPase) in the insect midgut. In this study, two cereal weevils, the sensitive Sitophilus oryzae strain WAA42, the resistance Sitophilus oryzae strain ISOR3 and the insensitive red flour beetle Tribolium castaneum, were used in biochemical and histological experiments to demonstrate that a PA1b/V-ATPase interaction triggers the apoptosis mechanism, resulting in insect death. Upon intoxication with PA1b, apoptotic bodies are formed in the cells of the insect midgut. In addition, caspase-3 enzyme activity occurs in the midgut of sensitive weevils after intoxication with active PA1b, but not in the midgut of resistant weevils. These biochemical data were confirmed by immuno-histochemical detection of the caspase-3 active form in the midgut of sensitive weevils. Immuno-labelling experiments also revealed that the caspase-3 active form and V-ATPase are close-localized in the insect midgut. The results concerning this unique peptidic V-ATPase inhibitor pave the way for the utilization of PA1b as a promising, more selective and eco-friendly insecticide.
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Affiliation(s)
- Vanessa Eyraud
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
| | - Séverine Balmand
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
| | - Lamis Karaki
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
| | - Isabelle Rahioui
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
| | - Catherine Sivignon
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071, Orléans, Cedex 2, France
| | - Corinne Royer
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
| | - Yvan Rahbé
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France
- Univ Lyon, INRA, INSA-Lyon, CNRS UMR 5240 MAP, F-69622, Villeurbanne, France
| | - Pedro Da Silva
- Univ Lyon, INSA-Lyon, INRA, BF2I, UMR0203, F-69621, Villeurbanne, France.
| | - Frédéric Gressent
- Laboratoire des Symbioses Tropicales et Méditerranéennes (LSTM), UMR IRD/SupAgro/INRA/UM2/CIRAD, F-34398, Montpellier, France
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Terrier VP, Delmas AF, Aucagne V. Efficient synthesis of cysteine-rich cyclic peptides through intramolecular native chemical ligation of N-Hnb-Cys peptide crypto-thioesters. Org Biomol Chem 2017; 15:316-319. [DOI: 10.1039/c6ob02546c] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
We herein introduce a straightforward synthetic route to cysteine-containing cyclic peptides. It is based on the intramolecular native chemical ligation of thioesters generated in situ from N-Hnb-Cys crypto-thioesters. The strategy is applied to a representative range of natural cyclic disulfide-rich peptide sequences.
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Affiliation(s)
- Victor P. Terrier
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans Cedex 2
- France
| | - Agnès F. Delmas
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans Cedex 2
- France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans Cedex 2
- France
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Loth K, Alami SAI, Habès C, Garrido S, Aucagne V, Delmas AF, Moreau T, Zani ML, Landon C. Complete 1H, 15N and 13C assignment of trappin-2 and 1H assignment of its two domains, elafin and cementoin. Biomol NMR Assign 2016; 10:223-226. [PMID: 26878852 DOI: 10.1007/s12104-016-9671-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 02/05/2016] [Indexed: 06/05/2023]
Abstract
Trappin-2 is a serine protease inhibitor with a very narrow inhibitory spectrum and has significant anti-microbial activities. It is a 10 kDa cationic protein composed of two distinct domains. The N-terminal domain (38 residues) named cementoin is known to be intrinsically disordered when it is not linked to the elafin. The C-terminal domain (57 residues), corresponding to elafin, is a cysteine-rich domain stabilized by four disulfide bridges and is characterized by a flat core and a flexible N-terminal part. To our knowledge, there is no structural data available on trappin-2. We report here the complete (1)H, (15)N and (13)C resonance assignment of the recombinant trappin-2 and the (1)H assignments of cementoin and elafin, under the same experimental conditions. This is the first step towards the 3D structure determination of the trappin-2.
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Affiliation(s)
- Karine Loth
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique (CNRS) UPR 4301, Université d'Orléans, rue Charles Sadron, 45071, Orléans Cedex 2, France.
| | - Soha Abou Ibrahim Alami
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique (CNRS) UPR 4301, Université d'Orléans, rue Charles Sadron, 45071, Orléans Cedex 2, France
| | - Chahrazed Habès
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique (CNRS) UPR 4301, Université d'Orléans, rue Charles Sadron, 45071, Orléans Cedex 2, France
| | - Solène Garrido
- Pathologies Respiratoires: Protéolyse et Aérosolthérapie, Faculté de Médecine, INSERM U1100, 10 Bd Tonnellé, 37032, Tours Cedex, France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique (CNRS) UPR 4301, Université d'Orléans, rue Charles Sadron, 45071, Orléans Cedex 2, France
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique (CNRS) UPR 4301, Université d'Orléans, rue Charles Sadron, 45071, Orléans Cedex 2, France
| | - Thierry Moreau
- Pathologies Respiratoires: Protéolyse et Aérosolthérapie, Faculté de Médecine, INSERM U1100, 10 Bd Tonnellé, 37032, Tours Cedex, France
| | - Marie-Louise Zani
- Pathologies Respiratoires: Protéolyse et Aérosolthérapie, Faculté de Médecine, INSERM U1100, 10 Bd Tonnellé, 37032, Tours Cedex, France
| | - Céline Landon
- Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique (CNRS) UPR 4301, Université d'Orléans, rue Charles Sadron, 45071, Orléans Cedex 2, France
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10
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Lelièvre D, Terrier VP, Delmas AF, Aucagne V. Native Chemical Ligation Strategy to Overcome Side Reactions during Fmoc-Based Synthesis of C-Terminal Cysteine-Containing Peptides. Org Lett 2016; 18:920-3. [DOI: 10.1021/acs.orglett.5b03612] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Dominique Lelièvre
- Centre de Biophysique
Moléculaire,
CNRS UPR 4301, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Victor P. Terrier
- Centre de Biophysique
Moléculaire,
CNRS UPR 4301, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Agnès F. Delmas
- Centre de Biophysique
Moléculaire,
CNRS UPR 4301, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Vincent Aucagne
- Centre de Biophysique
Moléculaire,
CNRS UPR 4301, Rue Charles Sadron, 45071 Orléans Cedex 2, France
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11
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Terrier VP, Adihou H, Arnould M, Delmas AF, Aucagne V. A straightforward method for automated Fmoc-based synthesis of bio-inspired peptide crypto-thioesters. Chem Sci 2015; 7:339-345. [PMID: 29861986 PMCID: PMC5952550 DOI: 10.1039/c5sc02630j] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Accepted: 09/22/2015] [Indexed: 01/19/2023] Open
Abstract
A bio-inspired method for the synthesis of peptide thioester surrogates for native chemical ligation was developed. The process can be fully automated and does not require postsynthetic steps.
Despite recent advances, the direct Fmoc-based solid phase synthesis of peptide α-thioesters for the convergent synthesis of proteins via native chemical ligation (NCL) remains a challenge in the field. We herein report a simple and general methodology, enabling access to peptide thioester surrogates. A novel C-terminal N-(2-hydroxybenzyl)cysteine thioesterification device based on an amide-to-thioester rearrangement was developed, and the resulting peptide crypto-thioesters can be directly used in NCL reactions with fast N → S shift kinetics at neutral pH. These fast kinetics arise from our bio-inspired design, via intein-like intramolecular catalysis. Due to a well-positioned phenol moiety, an impressive >50 fold increase in the kinetic rate is observed compared to an O-methylated derivative. Importantly, the synthesis of this new device can be fully automated using inexpensive commercially available materials and does not require any post-synthetic steps prior to NCL. We successfully applied this new method to the synthesis of two long naturally-occurring cysteine-rich peptide sequences.
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Affiliation(s)
- Victor P Terrier
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Hélène Adihou
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Mathieu Arnould
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
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12
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Galibert M, Piller V, Piller F, Aucagne V, Delmas AF. Combining triazole ligation and enzymatic glycosylation on solid phase simplifies the synthesis of very long glycoprotein analogues. Chem Sci 2015; 6:3617-3623. [PMID: 30155000 PMCID: PMC6085731 DOI: 10.1039/c5sc00773a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 04/12/2015] [Indexed: 01/01/2023] Open
Abstract
The solid-phase chemical assembly of a protein through iterative chemoselective ligation of unprotected peptide segments can be followed with chemical and/or enzymatic transformations of the resulting immobilized protein, the latter steps thus benefitting from the advantages provided by the solid support. We demonstrate here the usefulness of this strategy for the chemo-enzymatic synthesis of glycoprotein analogues. A linker was specifically designed for application to the synthesis of O-glycoproteins: this new linker is readily cleaved under mild aqueous conditions compatible with very sensitive glycosidic bonds, but is remarkably stable under a wide range of chemical and biochemical conditions. It was utilized for solid-supported N-to-C peptidomimetic triazole ligation followed by enzymatic glycosylation, ultimately leading to a very large MUC1-derived glycoprotein containing 160 amino acid residues, 24 α-GalNAc moieties linked to Ser and Thr, and 3 triazoles as peptide bond mimetics.
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Affiliation(s)
- Mathieu Galibert
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Véronique Piller
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Friedrich Piller
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire , CNRS UPR 4301 , Rue Charles Sadron , 45071 Orléans Cedex 2 , France .
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13
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Beltramo M, Robert V, Galibert M, Madinier JB, Marceau P, Dardente H, Decourt C, De Roux N, Lomet D, Delmas AF, Caraty A, Aucagne V. Rational design of triazololipopeptides analogs of kisspeptin inducing a long-lasting increase of gonadotropins. J Med Chem 2015; 58:3459-70. [PMID: 25811530 DOI: 10.1021/jm5019675] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
New potent and selective KISS1R agonists were designed using a combination of rational chemical modifications of the endogenous neuropeptide kisspeptin 10 (KP10). Improved resistance to degradation and presumably reduced renal clearance were obtained by introducing a 1,4-disubstituted 1,2,3-triazole as a proteolysis-resistant amide mimic and a serum albumin-binding motif, respectively. These triazololipopeptides are highly potent full agonists of KISS1R and are >100 selective over the closely related NPFF1R. When injected in ewes with a quiescent reproductive system, the best compound of our series induced a much prolonged increase of luteinizing hormone release compared to KP10 and increased follicle-stimulating hormone plasma concentration. Hence, this KISS1R agonist is a new valuable pharmacological tool to explore the potential of KP system in reproduction control. Furthermore, it represents the first step to develop drugs treating reproductive system disorders due to a reduced activity of the hypothalamo-pituitary-gonadal axis such as delayed puberty, hypothalamic amenorrhea, and hypogonadotropic hypogonadism.
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Affiliation(s)
- Massimiliano Beltramo
- †UMR Physiologie de la Reproduction et des Comportements (INRA, UMR85; CNRS, UMR7247; Université François Rabelais Tours; IFCE), F-37380 Nouzilly, France
| | - Vincent Robert
- †UMR Physiologie de la Reproduction et des Comportements (INRA, UMR85; CNRS, UMR7247; Université François Rabelais Tours; IFCE), F-37380 Nouzilly, France
| | - Mathieu Galibert
- ‡Centre de Biophysique Moléculaire (CNRS UPR4301), Rue Charles Sadron, F-45071 Orléans Cedex 2, France
| | - Jean-Baptiste Madinier
- ‡Centre de Biophysique Moléculaire (CNRS UPR4301), Rue Charles Sadron, F-45071 Orléans Cedex 2, France
| | - Philippe Marceau
- ‡Centre de Biophysique Moléculaire (CNRS UPR4301), Rue Charles Sadron, F-45071 Orléans Cedex 2, France
| | - Hugues Dardente
- †UMR Physiologie de la Reproduction et des Comportements (INRA, UMR85; CNRS, UMR7247; Université François Rabelais Tours; IFCE), F-37380 Nouzilly, France
| | - Caroline Decourt
- †UMR Physiologie de la Reproduction et des Comportements (INRA, UMR85; CNRS, UMR7247; Université François Rabelais Tours; IFCE), F-37380 Nouzilly, France
| | | | - Didier Lomet
- †UMR Physiologie de la Reproduction et des Comportements (INRA, UMR85; CNRS, UMR7247; Université François Rabelais Tours; IFCE), F-37380 Nouzilly, France
| | - Agnès F Delmas
- ‡Centre de Biophysique Moléculaire (CNRS UPR4301), Rue Charles Sadron, F-45071 Orléans Cedex 2, France
| | - Alain Caraty
- †UMR Physiologie de la Reproduction et des Comportements (INRA, UMR85; CNRS, UMR7247; Université François Rabelais Tours; IFCE), F-37380 Nouzilly, France
| | - Vincent Aucagne
- ‡Centre de Biophysique Moléculaire (CNRS UPR4301), Rue Charles Sadron, F-45071 Orléans Cedex 2, France
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14
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Meindre F, Lelièvre D, Loth K, Mith O, Aucagne V, Berthomieu P, Marquès L, Delmas AF, Landon C, Paquet F. The Nuclear Magnetic Resonance Solution Structure of the Synthetic AhPDF1.1b Plant Defensin Evidences the Structural Feature within the γ-Motif. Biochemistry 2014; 53:7745-54. [DOI: 10.1021/bi501285k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Fanny Meindre
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
| | - Dominique Lelièvre
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
| | - Karine Loth
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
| | - Oriane Mith
- Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, INRA/SupAgro, 2 Place P. Viala, 34060 Montpellier Cedex 2, France
| | - Vincent Aucagne
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
| | - Pierre Berthomieu
- Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, INRA/SupAgro, 2 Place P. Viala, 34060 Montpellier Cedex 2, France
| | - Laurence Marquès
- Laboratoire de Biochimie & Physiologie Moléculaire des Plantes, INRA/SupAgro, 2 Place P. Viala, 34060 Montpellier Cedex 2, France
| | - Agnès F. Delmas
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
| | - Céline Landon
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
| | - Françoise Paquet
- Centre
de Biophysique Moléculaire, CNRS UPR4301, Rue Charles
Sadron, 45071 Orléans Cedex 2, France
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15
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Muench SP, Rawson S, Eyraud V, Delmas AF, Da Silva P, Phillips C, Trinick J, Harrison MA, Gressent F, Huss M. PA1b inhibitor binding to subunits c and e of the vacuolar ATPase reveals its insecticidal mechanism. J Biol Chem 2014; 289:16399-408. [PMID: 24795045 PMCID: PMC4047407 DOI: 10.1074/jbc.m113.541250] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Revised: 04/14/2014] [Indexed: 12/03/2022] Open
Abstract
The vacuolar ATPase (V-ATPase) is a 1MDa transmembrane proton pump that operates via a rotary mechanism fuelled by ATP. Essential for eukaryotic cell homeostasis, it plays central roles in bone remodeling and tumor invasiveness, making it a key therapeutic target. Its importance in arthropod physiology also makes it a promising pesticide target. The major challenge in designing lead compounds against the V-ATPase is its ubiquitous nature, such that any therapeutic must be capable of targeting particular isoforms. Here, we have characterized the binding site on the V-ATPase of pea albumin 1b (PA1b), a small cystine knot protein that shows exquisitely selective inhibition of insect V-ATPases. Electron microscopy shows that PA1b binding occurs across a range of equivalent sites on the c ring of the membrane domain. In the presence of Mg·ATP, PA1b localizes to a single site, distant from subunit a, which is predicted to be the interface for other inhibitors. Photoaffinity labeling studies show radiolabeling of subunits c and e. In addition, weevil resistance to PA1b is correlated with bafilomycin resistance, caused by mutation of subunit c. The data indicate a binding site to which both subunits c and e contribute and inhibition that involves locking the c ring rotor to a static subunit e and not subunit a. This has implications for understanding the V-ATPase mechanism and that of inhibitors with therapeutic or pesticidal potential. It also provides the first evidence for the position of subunit e within the complex.
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Affiliation(s)
- Stephen P Muench
- From the School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, LS2 9JT Leeds, West Yorkshire, United Kingdom,
| | - Shaun Rawson
- From the School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, LS2 9JT Leeds, West Yorkshire, United Kingdom
| | - Vanessa Eyraud
- Institut National de la Recherche Agronomique, Institut National des Sciences Appliquées-Lyon, Université de Lyon, IFR 41, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Batiment Louis-Pasteur 20, avenue Albert Einstein, F-69621 Villeurbanne, France
| | - Agnès F Delmas
- the Centre de Biophysique Moléculaire, Centre National de la Recherche Scientifique Unité Propre de Recherche 4301, Rue Charles Sadron, 45071 Orléans cedex 2, France
| | - Pedro Da Silva
- Institut National de la Recherche Agronomique, Institut National des Sciences Appliquées-Lyon, Université de Lyon, IFR 41, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Batiment Louis-Pasteur 20, avenue Albert Einstein, F-69621 Villeurbanne, France
| | - Clair Phillips
- From the School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, LS2 9JT Leeds, West Yorkshire, United Kingdom
| | - John Trinick
- the School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, LS2 9JT Leeds, West Yorkshire, United Kingdom, and
| | - Michael A Harrison
- From the School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, LS2 9JT Leeds, West Yorkshire, United Kingdom
| | - Frédéric Gressent
- Institut National de la Recherche Agronomique, Institut National des Sciences Appliquées-Lyon, Université de Lyon, IFR 41, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Batiment Louis-Pasteur 20, avenue Albert Einstein, F-69621 Villeurbanne, France
| | - Markus Huss
- Abteilung Tierphysiologie, Fachbereich Biologie/Chemie Universität Osnabrück, 49069 Osnabrück, Germany
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16
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Hervé V, Meudal H, Labas V, Réhault-Godbert S, Gautron J, Berges M, Guyot N, Delmas AF, Nys Y, Landon C. Three-dimensional NMR structure of Hen Egg Gallin (Chicken Ovodefensin) reveals a new variation of the β-defensin fold. J Biol Chem 2014; 289:7211-7220. [PMID: 24443564 DOI: 10.1074/jbc.m113.507046] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Gallin is a 41-residue protein, first identified as a minor component of hen egg white and found to be antimicrobial against Escherichia coli. Gallin may participate in the protection of the embryo during its development in the egg. Its sequence is related to antimicrobial β-defensin peptides. In the present study, gallin was chemically synthesized 1) to further investigate its antimicrobial spectrum and 2) to solve its three-dimensional NMR structure and thus gain insight into structure-function relationships, a prerequisite to understanding its mode(s) of action. Antibacterial assays confirmed that gallin was active against Escherichia coli, but no additional antibacterial activity was observed against the other Gram-positive or Gram-negative bacteria tested. The three-dimensional structure of gallin, which is the first ovodefensin structure to have been solved to date, displays a new five-stranded arrangement. The gallin three-dimensional fold contains the three-stranded antiparallel β-sheet and the disulfide bridge array typical of vertebrate β-defensins. Gallin can therefore be unambiguously classified as a β-defensin. However, an additional short two-stranded β-sheet reveals that gallin and presumably the other ovodefensins form a new structural subfamily of β-defensins. Moreover, gallin and the other ovodefensins calculated by homology modeling exhibit atypical hydrophobic surface properties, compared with the already known vertebrate β-defensins. These specific structural features of gallin might be related to its restricted activity against E. coli and/or to other yet unknown functions. This work provides initial understanding of a critical sequence-structure-function relationship for the ovodefensin family.
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Affiliation(s)
- Virginie Hervé
- From Institut National de la Recherche Agronomique (INRA), UR83 Recherches Avicoles, Fonction et Régulation des Protéines de l'œuf, F-37380 Nouzilly, France; Université François Rabelais, UMR 1100, F-37032 Tours, France; INSERM, Centre d'Etude des Pathologies Respiratoires, UMR 1100/EA6305, F-37032 Tours, France
| | - Hervé Meudal
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Valérie Labas
- Plate-forme d'Analyse Intégrative des Biomolécules UMR INRA 85-CNRS 7247, Université François Rabelais, Institut Français du Cheval et de l'Équitation (IFCE), F-37380 Nouzilly, France
| | - Sophie Réhault-Godbert
- From Institut National de la Recherche Agronomique (INRA), UR83 Recherches Avicoles, Fonction et Régulation des Protéines de l'œuf, F-37380 Nouzilly, France
| | - Joël Gautron
- From Institut National de la Recherche Agronomique (INRA), UR83 Recherches Avicoles, Fonction et Régulation des Protéines de l'œuf, F-37380 Nouzilly, France
| | - Magali Berges
- From Institut National de la Recherche Agronomique (INRA), UR83 Recherches Avicoles, Fonction et Régulation des Protéines de l'œuf, F-37380 Nouzilly, France
| | - Nicolas Guyot
- From Institut National de la Recherche Agronomique (INRA), UR83 Recherches Avicoles, Fonction et Régulation des Protéines de l'œuf, F-37380 Nouzilly, France
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, Rue Charles Sadron, 45071 Orléans Cedex 2, France
| | - Yves Nys
- From Institut National de la Recherche Agronomique (INRA), UR83 Recherches Avicoles, Fonction et Régulation des Protéines de l'œuf, F-37380 Nouzilly, France.
| | - Céline Landon
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Université d'Orléans, Rue Charles Sadron, 45071 Orléans Cedex 2, France.
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Decostaire IE, Lelièvre D, Aucagne V, Delmas AF. Solid phase oxime ligations for the iterative synthesis of polypeptide conjugates. Org Biomol Chem 2014; 12:5536-43. [DOI: 10.1039/c4ob00760c] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
All on-resin! An efficient C-to-N iterative strategy for solid phase chemical ligations (SPCL).
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Affiliation(s)
| | - Dominique Lelièvre
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans cedex 2, France
| | - Vincent Aucagne
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans cedex 2, France
| | - Agnès F. Delmas
- Centre de Biophysique Moléculaire
- CNRS UPR 4301
- 45071 Orléans cedex 2, France
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18
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Senille V, Lelievre D, Paquet F, Garnier N, Lamb N, Legrand A, Delmas AF, Landon C. The addressing fragment of mitogaligin: first insights into functional and structural properties. Chembiochem 2013; 14:711-20. [PMID: 23532929 DOI: 10.1002/cbic.201200715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2012] [Indexed: 11/07/2022]
Abstract
Mitogaligin is a mitochondrion-targeting protein involved in cell death. The sequence of the protein is unrelated to that of any known pro- or antiapoptotic protein. Mitochondrial targeting is controlled by an internal sequence from residues 31 to 53, and although this sequence is essential and sufficient to provoke cell death, the precise mechanism of action at the mitochondrial membrane remains to be elucidated. Here, by focusing on the [31-53] fragment, we first assessed and confirmed its cell cytotoxicity by microinjection. Subsequently, with the aid of membrane models, we evaluated the impact of the membrane environment on the 3D structure of the peptide and on how the peptide is embedded and oriented within membranes. The fragment is well organized, even though it does not contain a canonical secondary structure, and adopts an interfacial location. Structural comparison with other membrane-interacting Trp-rich peptides demonstrated similarities with the antimicrobial peptide tritrpcidin.
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Affiliation(s)
- Violette Senille
- Centre de Biophysique Moléculaire, CNRS UPR4301 affiliated to the University of Orléans, Rue Charles Sadron, 45071 Orléans cedex 2, France
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Raibaut L, Adihou H, Desmet R, Delmas AF, Aucagne V, Melnyk O. Highly efficient solid phase synthesis of large polypeptides by iterative ligations of bis(2-sulfanylethyl)amido (SEA) peptide segments. Chem Sci 2013. [DOI: 10.1039/c3sc51824h] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
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20
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Aucagne V, Valverde IE, Marceau P, Galibert M, Dendane N, Delmas AF. Towards the Simplification of Protein Synthesis: Iterative Solid-Supported Ligations with Concomitant Purifications. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206428] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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21
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Aucagne V, Valverde IE, Marceau P, Galibert M, Dendane N, Delmas AF. Towards the Simplification of Protein Synthesis: Iterative Solid-Supported Ligations with Concomitant Purifications. Angew Chem Int Ed Engl 2012; 51:11320-4. [DOI: 10.1002/anie.201206428] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Indexed: 12/25/2022]
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22
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Tavel L, Jaquillard L, Karsisiotis AI, Saab F, Jouvensal L, Brans A, Delmas AF, Schoentgen F, Cadene M, Damblon C. Ligand binding study of human PEBP1/RKIP: interaction with nucleotides and Raf-1 peptides evidenced by NMR and mass spectrometry. PLoS One 2012; 7:e36187. [PMID: 22558375 PMCID: PMC3338619 DOI: 10.1371/journal.pone.0036187] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Accepted: 04/02/2012] [Indexed: 01/07/2023] Open
Abstract
Background Human Phosphatidylethanolamine binding protein 1 (hPEBP1) also known as Raf kinase inhibitory protein (RKIP), affects various cellular processes, and is implicated in metastasis formation and Alzheimer's disease. Human PEBP1 has also been shown to inhibit the Raf/MEK/ERK pathway. Numerous reports concern various mammalian PEBP1 binding ligands. However, since PEBP1 proteins from many different species were investigated, drawing general conclusions regarding human PEBP1 binding properties is rather difficult. Moreover, the binding site of Raf-1 on hPEBP1 is still unknown. Methods/Findings In the present study, we investigated human PEBP1 by NMR to determine the binding site of four different ligands: GTP, FMN, and one Raf-1 peptide in tri-phosphorylated and non-phosphorylated forms. The study was carried out by NMR in near physiological conditions, allowing for the identification of the binding site and the determination of the affinity constants KD for different ligands. Native mass spectrometry was used as an alternative method for measuring KD values. Conclusions/Significance Our study demonstrates and/or confirms the binding of hPEBP1 to the four studied ligands. All of them bind to the same region centered on the conserved ligand-binding pocket of hPEBP1. Although the affinities for GTP and FMN decrease as pH, salt concentration and temperature increase from pH 6.5/NaCl 0 mM/20°C to pH 7.5/NaCl 100 mM/30°C, both ligands clearly do bind under conditions similar to what is found in cells regarding pH, salt concentration and temperature. In addition, our work confirms that residues in the vicinity of the pocket rather than those within the pocket seem to be required for interaction with Raf-1.
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Affiliation(s)
- Laurette Tavel
- Department of Chemistry, University of Liège, Liège, Belgium
| | | | | | - Fabienne Saab
- CBM, CNRS, Orléans, France
- Institut de Chimie Organique et Analytique (ICOA), University of Orléans, CNRS FR 2708, UMR 7311, Orléans, France
| | | | | | | | | | | | - Christian Damblon
- Department of Chemistry, University of Liège, Liège, Belgium
- * E-mail:
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Gaulier C, Hospital A, Legeret B, Delmas AF, Aucagne V, Cisnetti F, Gautier A. A water soluble CuI–NHC for CuAAC ligation of unprotected peptides under open air conditions. Chem Commun (Camb) 2012; 48:4005-7. [DOI: 10.1039/c2cc30515a] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Derache C, Meudal H, Aucagne V, Mark KJ, Cadène M, Delmas AF, Lalmanach AC, Landon C. Initial insights into structure-activity relationships of avian defensins. J Biol Chem 2011; 287:7746-55. [PMID: 22205704 DOI: 10.1074/jbc.m111.312108] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Numerous β-defensins have been identified in birds, and the potential use of these peptides as alternatives to antibiotics has been proposed, in particular to fight antibiotic-resistant and zoonotic bacterial species. Little is known about the mechanism of antibacterial activity of avian β-defensins, and this study was carried out to obtain initial insights into the involvement of structural features or specific residues in the antimicrobial activity of chicken AvBD2. Chicken AvBD2 and its enantiomeric counterpart were chemically synthesized. Peptide elongation and oxidative folding were both optimized. The similar antimicrobial activity measured for both L- and D-proteins clearly indicates that there is no chiral partner. Therefore, the bacterial membrane is in all likelihood the primary target. Moreover, this work indicates that the three-dimensional fold is required for an optimal antimicrobial activity, in particular for gram-positive bacterial strains. The three-dimensional NMR structure of chicken AvBD2 defensin displays the structural three-stranded antiparallel β-sheet characteristic of β-defensins. The surface of the molecule does not display any amphipathic character. In light of this new structure and of the king penguin AvBD103b defensin structure, the consensus sequence of the avian β-defensin family was analyzed. Well conserved residues were highlighted, and the potential strategic role of the lysine 31 residue of AvBD2 was emphasized. The synthetic AvBD2-K31A variant displayed substantial N-terminal structural modifications and a dramatic decrease in activity. Taken together, these results demonstrate the structural as well as the functional role of the critical lysine 31 residue in antimicrobial activity.
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Affiliation(s)
- Chrystelle Derache
- Centre de Biophysique Moléculaire, CNRS UPR4301, rue Charles Sadron, 45071 Orléans, France
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Valverde IE, Lecaille F, Lalmanach G, Aucagne V, Delmas AF. Synthesis of a Biologically Active Triazole-Containing Analogue of Cystatin A Through Successive Peptidomimetic Alkyne-Azide Ligations. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201107222] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Valverde IE, Lecaille F, Lalmanach G, Aucagne V, Delmas AF. Synthesis of a biologically active triazole-containing analogue of cystatin A through successive peptidomimetic alkyne-azide ligations. Angew Chem Int Ed Engl 2011; 51:718-22. [PMID: 22144344 DOI: 10.1002/anie.201107222] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2011] [Revised: 11/08/2011] [Indexed: 12/18/2022]
Affiliation(s)
- Ibai E Valverde
- Centre de Biophysique Moléculaire, CNRS UPR 4301, Rue Charles Sadron, 45071 Orléans cedex 2, France
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Buré C, Marceau P, Meudal H, Delmas AF. Synthesis and analytical investigation of C-terminally modified peptide aldehydes and ketone: application to oxime ligation. J Pept Sci 2011; 18:147-54. [DOI: 10.1002/psc.1429] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2011] [Revised: 10/11/2011] [Accepted: 10/14/2011] [Indexed: 11/11/2022]
Affiliation(s)
- Corinne Buré
- Centre de Biophysique Moléculaire CNRS UPR4301; affiliated to the University of Orléans and INSERM; rue Charles Sadron 45071 Orléans cedex 2 France
- Present address: Chimie et Biologie des Membranes et des Nanoobjets (CBMN) - UMR 5248 Centre de Génomique Fonctionnelle BP 68; Université Bordeaux 2 Victor Segalen; 146, rue Léo Saignat 33076 Bordeaux Cedex France
| | - Philippe Marceau
- Centre de Biophysique Moléculaire CNRS UPR4301; affiliated to the University of Orléans and INSERM; rue Charles Sadron 45071 Orléans cedex 2 France
| | - Hervé Meudal
- Centre de Biophysique Moléculaire CNRS UPR4301; affiliated to the University of Orléans and INSERM; rue Charles Sadron 45071 Orléans cedex 2 France
| | - Agnès F. Delmas
- Centre de Biophysique Moléculaire CNRS UPR4301; affiliated to the University of Orléans and INSERM; rue Charles Sadron 45071 Orléans cedex 2 France
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Hardouin J, Cremer AG, Delmas AF. Investigation of in-source decay of oxime-linked peptide by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Rapid Commun Mass Spectrom 2011; 25:2106-2112. [PMID: 21698695 DOI: 10.1002/rcm.5071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Da Silva P, Rahioui I, Laugier C, Jouvensal L, Meudal H, Chouabe C, Delmas AF, Gressent F. Molecular requirements for the insecticidal activity of the plant peptide pea albumin 1 subunit b (PA1b). J Biol Chem 2010; 285:32689-32694. [PMID: 20660598 PMCID: PMC2963353 DOI: 10.1074/jbc.m110.147199] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Revised: 07/07/2010] [Indexed: 11/06/2022] Open
Abstract
PA1b (pea albumin 1, subunit b) is a small and compact 37-amino acid protein, isolated from pea seeds (Pisum sativum), that adopts a cystine knot fold. It acts as a potent insecticidal agent against major pests in stored crops and vegetables, making it a promising bioinsecticide. Here, we investigate the influence of individual residues on the structure and bioactivity of PA1b. A collection of 13 PA1b mutants was successfully chemically synthesized in which the residues involved in the definition of PA1b amphiphilic and electrostatic characteristics were individually replaced with an alanine. The three-dimensional structure of PA1b was outstandingly tolerant of modifications. Remarkably, receptor binding and insecticidal activities were both dependent on common well defined clusters of residues located on one single face of the toxin, with Phe-10, Arg-21, Ile-23, and Leu-27 being key residues of the binding interaction. The inactivity of the mutants is clearly due to a change in the nature of the side chain rather than to a side effect, such as misfolding or degradation of the peptide, in the insect digestive tract. We have shown that a hydrophobic patch is the putative site of the interaction of PA1b with its binding site. Overall, the mutagenesis data provide major insights into the functional elements responsible for PA1b entomotoxic properties and give some clues toward a better understanding of the PA1b mode of action.
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Affiliation(s)
- Pedro Da Silva
- From the Institut National de la Recherche Agronomique (INRA), Institut National des Sciences Appliquées de Lyon (INSA-Lyon), IFR-41, UMR203 BF2I, Biologie Fonctionnelle, Insectes et Interactions, Université de Lyon, Bâtiment Louis Pasteur, F-69621 Villeurbanne.
| | - Isabelle Rahioui
- From the Institut National de la Recherche Agronomique (INRA), Institut National des Sciences Appliquées de Lyon (INSA-Lyon), IFR-41, UMR203 BF2I, Biologie Fonctionnelle, Insectes et Interactions, Université de Lyon, Bâtiment Louis Pasteur, F-69621 Villeurbanne
| | - Christian Laugier
- From the Institut National de la Recherche Agronomique (INRA), Institut National des Sciences Appliquées de Lyon (INSA-Lyon), IFR-41, UMR203 BF2I, Biologie Fonctionnelle, Insectes et Interactions, Université de Lyon, Bâtiment Louis Pasteur, F-69621 Villeurbanne
| | - Laurence Jouvensal
- Centre de Biophysique Moléculaire, UPR 4301 CNRS, University of Orléans and INSERM, rue Charles Sadron, 45071 Orléans Cedex 2
| | - Hervé Meudal
- Centre de Biophysique Moléculaire, UPR 4301 CNRS, University of Orléans and INSERM, rue Charles Sadron, 45071 Orléans Cedex 2
| | - Christophe Chouabe
- CNRS UMR 5123, Physiologie des Régulations Energétiques, Cellulaires et Moléculaires, Campus de la Doua, Université de Lyon 1, 69622 Villeurbanne, France
| | - Agnès F Delmas
- Centre de Biophysique Moléculaire, UPR 4301 CNRS, University of Orléans and INSERM, rue Charles Sadron, 45071 Orléans Cedex 2
| | - Frédéric Gressent
- From the Institut National de la Recherche Agronomique (INRA), Institut National des Sciences Appliquées de Lyon (INSA-Lyon), IFR-41, UMR203 BF2I, Biologie Fonctionnelle, Insectes et Interactions, Université de Lyon, Bâtiment Louis Pasteur, F-69621 Villeurbanne
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Valverde IE, Delmas AF, Aucagne V. Click à la carte: robust semi-orthogonal alkyne protecting groups for multiple successive azide/alkyne cycloadditions. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.06.093] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Buré C, Maget R, Delmas AF, Pichon C, Midoux P. Histidine-rich peptide: evidence for a single zinc-binding site on H5WYG peptide that promotes membrane fusion at neutral pH. J Mass Spectrom 2009; 44:81-89. [PMID: 18698560 DOI: 10.1002/jms.1473] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The histidine-rich peptide H5WYG (GLFHAIAHFIHGGWHGLIHGWYG) was found to induce membrane fusion at physiologic pH in the presence of zinc chloride. In this study, we examined the ion selectivity of the interaction of Zn(2+) with H5WYG. This investigation was conducted by using adsorption at air/water interface and mass spectrometry. We found that a peptide-metal complex is formed with Zn(2+) ions. Electrospray ionisation-mass spectrometry (ESI-MS) reveals that the [H5WYG + Zn + 2H](4+), [H5WYG + Zn + H](3+) and [H5WYG + Zn](2+) ions, appearing by increasing the amount of Zn(2+) equivalent, correspond to a monomolecular H5WYG - Zn(2+) complex. Tandem mass spectrometry (MS/MS) provides evidence for the binding of the single Zn(2+) ion to the H(11) and H(19) and probably H(15) residues.
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Affiliation(s)
- Corinne Buré
- Centre de Biophysique Moléculaire CNRS UPR4301 affiliated to the University of Orléans and Inserm, Orléans cedex 2, France.
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Da Silva P, Strzepa A, Jouvensal L, Rahioui I, Gressent F, Delmas AF. A folded and functional synthetic PA1b: an interlocked entomotoxic miniprotein. Biopolymers 2009; 92:436-44. [PMID: 19399851 DOI: 10.1002/bip.21217] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
PA1b (Pea Albumin 1, subunit b) is a hydrophobic, 37-amino acid miniprotein isolated from pea seeds (Pivum sativum), crosslinked by three interlocked disulfide bridges, signature of the ICK (inhibitory cystine-knot) family. It acts as an entomotoxic factor against major insect pests in stored crops and vegetables, making it a promising bioinsecticide. Here we report an efficient and simple protocol for the production of large quantities of highly pure, biologically active synthetic PA1b. The features of PA1b oxidative refolding revealed the off-pathway products and competitive aggregation processes. The efficiency of the oxidative folding can be significantly improved by using hydrophobic alcoholic cosolvents and decreasing the temperature. The homogeneity of the synthetic oxidized PA1b was established by reversed-phase HPLC. The correct pairing of the three disulfide bridges, as well as the three-dimensional structure of synthetic PA1b was assessed by NMR. Synthetic PA1b binds to microsomal proteins from Sitophilus oryzae with a Kd of 8 nM, a figure quite similar to that determined for PA1b extracted from its natural source. Moreover, the synthetic miniprotein was as potent as the extracted one towards the sensitive strains of weevils. Our findings will open the way to the production of PA1b analogues by chemical means to an in-depth understanding of the PA1b mechanism of action.
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Affiliation(s)
- Pedro Da Silva
- Université de Lyon, INRA, INSA-Lyon, IFR-41, UMR203 BF2I, Biologie Fonctionnelle Insectes et Interactions, Villeurbanne, France
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Lelièvre D, Barta P, Aucagne V, Delmas AF. Preparation of peptide thioesters using Fmoc strategy through hydroxyl side chain anchoring. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.04.087] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Buré C, Goffinont S, Delmas AF, Cadene M, Culard F. Oxidation-sensitive Residues Mediate the DNA Bending Abilities of the Architectural MC1 Protein. J Mol Biol 2008; 376:120-30. [DOI: 10.1016/j.jmb.2007.11.057] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2007] [Revised: 11/13/2007] [Accepted: 11/13/2007] [Indexed: 11/13/2022]
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Cremer GA, Bureaud N, Piller V, Kunz H, Piller F, Delmas AF. Synthesis and biological evaluation of a multiantigenic Tn/TF-containing glycopeptide mimic of the tumor-related MUC1 glycoprotein. ChemMedChem 2006; 1:965-8. [PMID: 16952141 DOI: 10.1002/cmdc.200600104] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Gaëlle-Anne Cremer
- Centre de Biophysique Moléculaire, UPR 4301 CNRS, Affiliated with the University of Orléans and INSERM rue Charles Sadron, 45071 Orléans Cedex 2, France
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Hardouin J, Hubert-Roux M, Delmas AF, Lange C. Identification of isoenzymes using matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Rapid Commun Mass Spectrom 2006; 20:725-32. [PMID: 16456911 DOI: 10.1002/rcm.2355] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
The identification of isoforms is one of the great challenges in proteomics due to the large number of identical amino acids preventing their separations by two-dimensional electrophoresis. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOFMS) has become a rapid and sensitive tool in proteomics, notably with the new instrumental improvements. In this study, we used several acquisition modes of MALDI-TOFMS to identify isoforms of porcine glutathiones S-transferase. The use of multiple proteases coupled to the different acquisition modes of MALDI-TOFMS (linear, reflectron, post-source decay (PSD) and in-source decay, positive and negative modes) allowed the identification of two sequences. Moreover, a third sequence is pointed out from a PSD study of a tryptic ion revealing the modification of the amino acid tyrosine 146 to phenylalanine.
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Affiliation(s)
- Julie Hardouin
- Laboratoire de Spectrométrie de Masse Bio-Organique, CNRS-UMR 6014, UFR des Sciences, Université de Rouen, 76 821 Mont-Saint-Aignan Cedex, France
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Buré C, Castaing B, Lange C, Delmas AF. Location and base selectivity on fragmentation of brominated oligodeoxynucleotides. J Mass Spectrom 2006; 41:84-90. [PMID: 16317709 DOI: 10.1002/jms.967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Bromine-modified oligodeoxynucleotides (ODNs) were fragmented in the electrospray source to study the influence of brominated bases on fragmentation. Several 13-mer ODNs containing a brominated pyrimidine base, BrdU (5-bromodeoxyuridine) or BrdC (5-bromodeoxycytidine), were analyzed. Low cone voltage fragmentation yields a loss of the brominated base with a preferential loss for the brominated base closer to the 5'-end (2-position > 4-position > 12-position) as well as a preferential loss of BrdU over BrdC. Higher cone voltage produces backbone fragmentation with complementary a(n)-base and w(m) ions close to the brominated base. On the basis of these observations, we located the brominated base in the sequence for all of the ODNs studied.
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Affiliation(s)
- Corinne Buré
- Centre de Biophysique Moléculaire, CNRS UPR 4301, University of Orléans and INSERM, rue Charles Sadron, 45071 Orléans Cedex 02, France.
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Marceau P, Buré C, Delmas AF. Efficient synthesis of C-terminal modified peptide ketones for chemical ligations. Bioorg Med Chem Lett 2005; 15:5442-5. [PMID: 16199157 DOI: 10.1016/j.bmcl.2005.08.105] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2005] [Revised: 08/25/2005] [Accepted: 08/30/2005] [Indexed: 10/25/2022]
Abstract
Synthesis of a C-terminal modified peptide with an alpha-amido methylketone was efficiently carried out using a backbone-amide-type linker loading with a monofunctionalized diamine, provided that no base such as piperidine or diisopropylethylamine or a reducing agent such as triisopopylsilane was used for the synthetic pathway. The ketoxime-forming chemoselective ligation between a methylketone and an aminooxy was quantitative in 5h at pH 2.
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Affiliation(s)
- Philippe Marceau
- Centre de biophysique moléculaire, UPR 4301 CNRS , rue Charles Sadron, 45071 Orléans, Cedex 2, France
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Antonopoulos A, Hardouin J, Favetta P, Helbert W, Delmas AF, Lafosse M. Matrix-assisted laser desorption/ionisation mass spectrometry for the direct analysis of enzymatically digested kappa- iota- and hybrid iota/nu-carrageenans. Rapid Commun Mass Spectrom 2005; 19:2217-26. [PMID: 16015673 DOI: 10.1002/rcm.2051] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Enzymatically digested oligosaccharides of kappa-, iota- and hybrid iota/nu-carrageenans were analysed using matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry in the negative-ion mode. nor-Harmane was used as matrix. Depending on the stock concentration and the laser intensity applied, the oligosaccharides exhibited losses of sulphate units (neutralised by the Na+ ion, and thus non-stable), leaving the primary backbone structure in most cases with only the deprotonated sulphate groups (carrying the negative charge, stable). This meant that kappa- and iota-oligosaccharides could not be easily distinguished from one another since they share the same primary backbone structure. However, for the hybrid iota/nu-oligosaccharides the primary backbone structure could be identified since the nu-carrageenan repeating unit differs from that of the kappa/iota-carrageenan unit. For all types of oligosaccharides, the results indicated cleavage of an anhydrogalactose unit from the non-reducing end. Specifically, for the hybrid oligosaccharides of iota/nu-carrageenans, this type of fragmentation means that the nu-carrageenan unit is not positioned on the non-reducing end of the hybrid oligosaccharides. Dehydration reactions, and exchange reactions of Na+ with K+ and Ca2+, were also observed.
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Affiliation(s)
- Aristotelis Antonopoulos
- UMR CNRS 6005, Institut de Chimie Organique et Analytique, Université d'Orléans, BP 6759, 45067 Orléans Cedex 2, France
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Buré C, Boujard O, Bertrand M, Lange C, Delmas AF. Letter: collision-induced dissociation of peptide thioesters: influence of the peptide length on the fragmentation. Eur J Mass Spectrom (Chichester) 2005; 11:31-4. [PMID: 15947441 DOI: 10.1255/ejms.709] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
Five peptide thioesters of increasing length were fragmented under two processes, in-source and in- collision cell fragmentation, using an electrospray source coupled to a triple quadrupole. Comparison of their fragmentations was made in regard to the length. The two fragmentation conditions show that the peptide length has no influence on structural information and that the fragmentation efficiency is higher for the smallest peptides than for the longest. The particularity of these peptide thioesters consists on the neutral loss of ethanethiol. The absence of the a3 fragment ion and the presence of the (a3-17) ion on the CID mass spectra are noted.
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