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Paquet-Côté PA, Fillion M, Provencher MÈ, Otis F, Dionne J, Cardinal S, Collignon B, Bürck J, Lagüe P, Ulrich AS, Auger M, Voyer N. Crown ether modified peptide interactions with model membranes‡. Supramol Chem 2019. [DOI: 10.1080/10610278.2019.1574349] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | - Matthieu Fillion
- Département de chimie, PROTEO, CERMA and CQMF, Université Laval, Québec, Canada
| | | | - François Otis
- Département de chimie and PROTEO, Université Laval, Québec, Canada
| | - Justine Dionne
- Département de chimie, PROTEO, CERMA and CQMF, Université Laval, Québec, Canada
| | | | - Barbara Collignon
- Département de biochimie, de microbiologie et de bio-informatique and PROTEO, Université Laval, Québec, Canada
| | - Jochen Bürck
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Patrick Lagüe
- Département de biochimie, de microbiologie et de bio-informatique and PROTEO, Université Laval, Québec, Canada
| | - Anne S. Ulrich
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany
| | - Michèle Auger
- Département de chimie, PROTEO, CERMA and CQMF, Université Laval, Québec, Canada
| | - Normand Voyer
- Département de chimie and PROTEO, Université Laval, Québec, Canada
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Auger M, Lefèvre T, Otis F, Voyer N, Auger M. Lipid membrane interactions of a fluorinated peptide with potential ion channel-forming ability. Pept Sci (Hoboken) 2019. [DOI: 10.1002/pep2.24051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Maud Auger
- Regroupement québécois de Recherche sur la Fonction, l'Ingénierie et les Applications des Protéines (PROTEO), Centre de Recherche sur les Matériaux Avancés (CERMA), Centre Québécois sur les Matériaux Fonctionnels (CQMF), Département de Chimie, Université Laval, 1045 avenue de la Médecine; Québec QC Canada G1V 0A6
| | - Thierry Lefèvre
- Regroupement québécois de Recherche sur la Fonction, l'Ingénierie et les Applications des Protéines (PROTEO), Centre de Recherche sur les Matériaux Avancés (CERMA), Centre Québécois sur les Matériaux Fonctionnels (CQMF), Département de Chimie, Université Laval, 1045 avenue de la Médecine; Québec QC Canada G1V 0A6
| | - François Otis
- PROTEO, Département de chimie; Université Laval, 1045 avenue de la Médecine; Québec QC Canada G1V 0A6
| | - Normand Voyer
- PROTEO, Département de chimie; Université Laval, 1045 avenue de la Médecine; Québec QC Canada G1V 0A6
| | - Michèle Auger
- Regroupement québécois de Recherche sur la Fonction, l'Ingénierie et les Applications des Protéines (PROTEO), Centre de Recherche sur les Matériaux Avancés (CERMA), Centre Québécois sur les Matériaux Fonctionnels (CQMF), Département de Chimie, Université Laval, 1045 avenue de la Médecine; Québec QC Canada G1V 0A6
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3
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Dionne U, Chartier FJM, López de Los Santos Y, Lavoie N, Bernard DN, Banerjee SL, Otis F, Jacquet K, Tremblay MG, Jain M, Bourassa S, Gish GD, Gagné JP, Poirier GG, Laprise P, Voyer N, Landry CR, Doucet N, Bisson N. Direct Phosphorylation of SRC Homology 3 Domains by Tyrosine Kinase Receptors Disassembles Ligand-Induced Signaling Networks. Mol Cell 2018; 70:995-1007.e11. [PMID: 29910111 PMCID: PMC6014926 DOI: 10.1016/j.molcel.2018.05.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 03/20/2018] [Accepted: 05/10/2018] [Indexed: 11/23/2022]
Abstract
Phosphotyrosine (pTyr) signaling has evolved into a key cell-to-cell communication system. Activated receptor tyrosine kinases (RTKs) initiate several pTyr-dependent signaling networks by creating the docking sites required for the assembly of protein complexes. However, the mechanisms leading to network disassembly and its consequence on signal transduction remain essentially unknown. We show that activated RTKs terminate downstream signaling via the direct phosphorylation of an evolutionarily conserved Tyr present in most SRC homology (SH) 3 domains, which are often part of key hub proteins for RTK-dependent signaling. We demonstrate that the direct EPHA4 RTK phosphorylation of adaptor protein NCK SH3s at these sites results in the collapse of signaling networks and abrogates their function. We also reveal that this negative regulation mechanism is shared by other RTKs. Our findings uncover a conserved mechanism through which RTKs rapidly and reversibly terminate downstream signaling while remaining in a catalytically active state on the plasma membrane.
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Affiliation(s)
- Ugo Dionne
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada
| | - François J M Chartier
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada
| | - Yossef López de Los Santos
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; INRS-Institut Armand-Frappier, Université du Québec, Laval, QC, Canada
| | - Noémie Lavoie
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada
| | - David N Bernard
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; INRS-Institut Armand-Frappier, Université du Québec, Laval, QC, Canada
| | - Sara L Banerjee
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada
| | - François Otis
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; Département de Chimie, Université Laval, Québec, QC, Canada
| | - Kévin Jacquet
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada
| | - Michel G Tremblay
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada
| | - Mani Jain
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; Département de Biologie, Département de Biochimie, Microbiologie et Bio-informatique and Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec, QC, Canada
| | - Sylvie Bourassa
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada
| | - Gerald D Gish
- Lunenfeld-Tanenbaum Research Institute, Mount Sinai Hospital, Joseph and Wolf Lebovic Health Complex, Toronto, ON, Canada
| | - Jean-Philippe Gagné
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada
| | - Guy G Poirier
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Université Laval, Québec, QC, Canada
| | - Patrick Laprise
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Université Laval, Québec, QC, Canada
| | - Normand Voyer
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; Département de Chimie, Université Laval, Québec, QC, Canada
| | - Christian R Landry
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; Département de Biologie, Département de Biochimie, Microbiologie et Bio-informatique and Institut de Biologie Intégrative et des Systèmes, Université Laval, Québec, QC, Canada
| | - Nicolas Doucet
- PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; INRS-Institut Armand-Frappier, Université du Québec, Laval, QC, Canada
| | - Nicolas Bisson
- Centre de Recherche du Centre Hospitalier Universitaire (CHU) de Québec-Université Laval, Axe Oncologie, Québec, QC, Canada; Centre de Recherche sur le Cancer de l'Université Laval, Québec, QC, Canada; PROTEO-Quebec Network for Research on Protein Function, Engineering, and Applications, Québec, QC, Canada; Département de Biologie Moléculaire, Biochimie Médicale et Pathologie, Université Laval, Québec, QC, Canada.
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Pham VH, Maaroufi H, Balg C, Blais SP, Messier N, Roy PH, Otis F, Voyer N, Lapointe J, Chênevert R. Inhibition ofHelicobacter pyloriGlu-tRNAGlnamidotransferase by novel analogues of the putative transamidation intermediate. FEBS Lett 2016; 590:3335-3345. [DOI: 10.1002/1873-3468.12380] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 08/25/2016] [Accepted: 08/26/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Van Hau Pham
- Département de Biochimie, de Microbiologie et de Bio-informatique, Faculté des Sciences et de Génie; Université Laval; Québec Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS); Université Laval; Québec Canada
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
| | - Halim Maaroufi
- Institut de Biologie Intégrative et des Systèmes (IBIS); Université Laval; Québec Canada
| | - Christian Balg
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
- Département de Chimie, Faculté des Sciences et de Génie; Université Laval; Québec Canada
| | - Sébastien P. Blais
- Département de Biochimie, de Microbiologie et de Bio-informatique, Faculté des Sciences et de Génie; Université Laval; Québec Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS); Université Laval; Québec Canada
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
| | - Nancy Messier
- CHU de Québec; Centre de Recherche en Infectiologie; Université Laval; Québec Canada
| | - Paul H. Roy
- CHU de Québec; Centre de Recherche en Infectiologie; Université Laval; Québec Canada
| | - François Otis
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
- Département de Chimie, Faculté des Sciences et de Génie; Université Laval; Québec Canada
| | - Normand Voyer
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
- Département de Chimie, Faculté des Sciences et de Génie; Université Laval; Québec Canada
| | - Jacques Lapointe
- Département de Biochimie, de Microbiologie et de Bio-informatique, Faculté des Sciences et de Génie; Université Laval; Québec Canada
- Institut de Biologie Intégrative et des Systèmes (IBIS); Université Laval; Québec Canada
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
| | - Robert Chênevert
- The Quebec Network for Research on Protein Function, Structure and Engineering (PROTEO); Université Laval; Québec Canada
- Département de Chimie, Faculté des Sciences et de Génie; Université Laval; Québec Canada
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Savoie JD, Otis F, Bürck J, Ulrich AS, Voyer N. Crown ether helical peptides are preferentially inserted in lipid bilayers as a transmembrane ion channels. Biopolymers 2016; 104:427-33. [PMID: 25753314 DOI: 10.1002/bip.22633] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [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: 01/07/2015] [Revised: 02/18/2015] [Accepted: 02/23/2015] [Indexed: 11/08/2022]
Abstract
Oriented circular dichroism was used to study the alignment crown ether-modified peptides. The influence of different N- and C-functionalities was assessed using at variable peptide:lipid ratios from 1:20 to 1:200. Neither the functionalities nor the concentration had any major effect on the orientation. The alignment of the 21-mer peptides was also examined with lipid membranes of different bilayer thickness. The use of synchrotron radiation as light source allowed the study of peptide:lipid molar ratios from 1:20 to 1:1000. For all conditions studied, the peptides were found to be predominantly incorporated as a transmembrane helix into the membrane, especially at low peptide concentration, but started to aggregate on the membrane surface at higher peptide:lipid ratios. The structural information on the preferred trans-bilayer alignment of the crown ether functional groups explains their ion conductivity and is useful for the further development of membrane-active nanochemotherapeutics.
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Affiliation(s)
- Jean-Daniel Savoie
- Faculté des Sciences et de Génie, Département de chimie and PROTEO, Université Laval, Québec, QC, G1V 0A6, Canada.,Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), POB 3640, 76021, Karlsruhe, Germany
| | - François Otis
- Faculté des Sciences et de Génie, Département de chimie and PROTEO, Université Laval, Québec, QC, G1V 0A6, Canada
| | - Jochen Bürck
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), POB 3640, 76021, Karlsruhe, Germany
| | - Anne S Ulrich
- Institute of Biological Interfaces (IBG-2), Karlsruhe Institute of Technology (KIT), POB 3640, 76021, Karlsruhe, Germany
| | - Normand Voyer
- Faculté des Sciences et de Génie, Département de chimie and PROTEO, Université Laval, Québec, QC, G1V 0A6, Canada
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Voyer N, Godbout R, Légaré S, Auger MS, Otis F, Carpentier C, Lagüe P, Auger M. Self-Assembling and Ion Transport Properties of Membrane Active Peptides Driven by Formation of a Fluorous Interface. Biophys J 2016. [DOI: 10.1016/j.bpj.2015.11.2256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Robert É, Fillion M, Otis F, Voyer N, Auger M. Understanding How the Antimicrobial Peptide Thanatin Interacts with the Lipid Bilayer of Cell Walls Using Model Membranes. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Voyer N, Otis F, Biron E, Racine-Berthiaume C, Auger M, Hartwick K, Ouellet M. Development of Functional Artificial Ion Channels using Peptide Nanostructures. Biophys J 2014. [DOI: 10.1016/j.bpj.2013.11.2489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Abstract
Natural ion channel proteins possess remarkable properties that researchers could exploit to develop nanochemotherapeutics and diagnostic devices. Unfortunately, the poor stability, limited availability, and complexity of these structures have precluded their use in practical devices. One solution to these limitations is to develop simpler molecular systems through chemical synthesis that mimic the salient properties of artificial ion channels. Inspired by natural channel proteins, our group has developed a family of peptide nanostructures thatcreate channels for ions by aligning crown ethers on top of each other when they adopt an α-helical conformation. Advantages to this crown ether/peptide framework approach include the ease of synthesis, the predictability of their conformations, and the ability to fine-tune and engineer their properties. We have synthesized these structures using solid phase methods from artificial crown ether amino acids made from L-DOPA. Circular dichroism and FTIR spectroscopy studies in different media confirmed that the nanostructures adopt the predicted α-helical conformation. Fluorescence studies verified the crown ether stacking arrangement. We confirmed the channel activity by single-channel measurements using a modified patch-clamp technique, planar lipid bilayer (PLB) assays, and various vesicle experiments. From the results, we estimate that a 6 Å distance between two relays is ideal for sodium cation transport, but relatively efficient ion transport can still occur with an 11 Å distance between two crown ethers. Biophysical studies demonstrated that peptide channels operate as monomers in an equilibrium between adsorption at the surface and an active, transmembrane orientation. Toward practical applications of these systems, we have prepared channel analogs that bear a biotin moiety, and we have used them as nanotransducers successfully to detect avidin. Analogs of channel peptide nanostructures showed cytotoxicity against breast and leukemia cancer cells. Overall, we have prepared well-defined nanostructures with designed properties, demonstrated their transport abilities, and described their mechanism of action. We have also illustrated the advantages and the versatility of polypeptides for the construction of functional nanoscale artificial ion channels.
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Affiliation(s)
- François Otis
- Département de Chimie and PROTEO, Faculté des Sciences et de Génie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, Canada
| | - Michèle Auger
- Département de Chimie and PROTEO, Faculté des Sciences et de Génie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, Canada
| | - Normand Voyer
- Département de Chimie and PROTEO, Faculté des Sciences et de Génie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, Canada
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Arseneault M, Dumont M, Otis F, Voyer N. Characterization of channel-forming peptide nanostructures. Biophys Chem 2012; 162:6-13. [PMID: 22245249 DOI: 10.1016/j.bpc.2011.12.001] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2011] [Revised: 12/09/2011] [Accepted: 12/18/2011] [Indexed: 10/14/2022]
Abstract
We have prepared fluorescent analogs of known ion-channel-forming synthetic peptide nanostructures. These analogs were designed as probes to gain insight about the mechanism by which self-assembling amphiphilic peptides interact with lipid membranes. Conformational studies demonstrated that the labeled analogs retain their propensity to adopt a strong helical conformation in 2,2,2-trifluoroethanol and lipid bilayers. Attenuated total reflectance results indicated that the fluorescent peptide nanostructures are under an incorporation equilibrium between two forms, adsorbed at the surface or incorporated within the bilayer, similar to their unlabeled counterparts. However, when using a HeLa mimicking membrane, the proportion of peptide nanostructures in the transmembrane orientation decreases significantly. Finally, we were able to show by confocal microscopy studies that fluorescent analogs internalized into HeLa cells and localized into both the membranes of inner organelles and the cell membrane.
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Affiliation(s)
- Mathieu Arseneault
- PROTEO, Quebec Research Network on Protein Structure, Function and Engineering, Université Laval, Quebec City, Canada
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Affiliation(s)
- François Otis
- Département de Chimie and PROTEO, Faculté des Sciences et de Génie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, QC, Canada, G1V 0A6
| | - Charles Racine-Berthiaume
- Département de Chimie and PROTEO, Faculté des Sciences et de Génie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, QC, Canada, G1V 0A6
| | - Normand Voyer
- Département de Chimie and PROTEO, Faculté des Sciences et de Génie, Université Laval, Pavillon Alexandre-Vachon, 1045 avenue de la Médecine, Québec, QC, Canada, G1V 0A6
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Ouellet M, Otis F, Voyer N, Auger M. Biophysical studies of the interactions between 14-mer and 21-mer model amphipathic peptides and membranes: Insights on their modes of action. Biochimica et Biophysica Acta (BBA) - Biomembranes 2006; 1758:1235-44. [PMID: 16579961 DOI: 10.1016/j.bbamem.2006.02.020] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2005] [Revised: 02/16/2006] [Accepted: 02/16/2006] [Indexed: 11/17/2022]
Abstract
We have investigated the interactions between synthetic amphipathic peptides and zwitterionic model membranes. Peptides with 14 and 21 amino acids composed of leucines and phenylalanines modified by the addition of crown ethers have been synthesized. The 14-mer and 21-mer peptides both possess a helical amphipathic structure as revealed by circular dichroism. To shed light on their mechanism of membrane interaction, different complementary biophysical techniques have been used such as circular dichroism, fluorescence, membrane conductivity measurement and NMR spectroscopy. Results obtained by these different techniques show that the 14-mer peptide is a membrane perturbator that facilitate the leakage of species such as calcein and Na ions, while the 21-mer peptide acts as an ion channel. (31)P solid-state NMR experiments on multilamellar vesicles reveal that the dynamics and/or orientation of the polar headgroups are greatly affected by the presence of the peptides. Similar results have also been obtained in mechanically oriented DLPC and DMPC bilayers where different acyl chain lengths seem to play a role in the interaction. On the other hand, (2)H NMR experiments on multilamellar vesicles demonstrate that the acyl chain order is affected differently by the two peptides. Based on these studies, mechanisms of action are proposed for the 14-mer and 21-mer peptides with zwitterionic membranes.
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Affiliation(s)
- Marise Ouellet
- Département de Chimie, Centre de Recherche sur la Fonction, la Structure et l'Ingénierie des Protéines, Centre de Recherche en Sciences et Ingénierie des Macromolécules, Université Laval, Québec, Québec, Canada G1K 7P4
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Biron E, Otis F, Meillon JC, Robitaille M, Lamothe J, Van Hove P, Cormier ME, Voyer N. Design, synthesis, and characterization of peptide nanostructures having ion channel activity. Bioorg Med Chem 2004; 12:1279-90. [PMID: 15018900 DOI: 10.1016/j.bmc.2003.08.037] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [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: 07/17/2003] [Revised: 07/31/2003] [Accepted: 08/01/2003] [Indexed: 11/24/2022]
Abstract
We report the synthesis and the functional studies of multiple crown alpha-helical peptides designed to form artificial ion channels. The approach combines the versatility of solid phase peptide synthesis, the conformational predictability of peptidic molecules, and the solution synthesis of crown ethers with engineerable ion-binding abilities. Several biophysical methods were employed to characterize the activity and the mode of action of these crown peptide nanostructures. The 21 residue peptides bearing six 21-EC-7 turned out to facilitate the translocation of ions in a similar fashion to natural ion channels.
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Affiliation(s)
- Eric Biron
- Département de chimie and Centre de recherche sur la fonction, la structure et l'ingénierie des protéines, Faculté des sciences et de génie, Université Laval, Québec, Canada G1K 7P4
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