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Pahan S, Dey S, George G, Mahapatra SP, Puneeth Kumar DRGKR, Gopi HN. Design of Chiral β-Double Helices from γ-Peptide Foldamers. Angew Chem Int Ed Engl 2024; 63:e202316309. [PMID: 38009917 DOI: 10.1002/anie.202316309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/24/2023] [Accepted: 11/24/2023] [Indexed: 11/29/2023]
Abstract
Chirality is ubiquitous in nature, and homochirality is manifested in many biomolecules. Although β-double helices are rare in peptides and proteins, they consist of alternating L- and D-amino acids. No peptide double helices with homochiral amino acids have been observed. Here, we report chiral β-double helices constructed from γ-peptides consisting of alternating achiral (E)-α,β-unsaturated 4,4-dimethyl γ-amino acids and chiral (E)-α,β-unsaturated γ-amino acids in both single crystals and in solution. The two independent strands of the same peptide intertwine to form a β-double helix structure, and it is stabilized by inter-strand hydrogen bonds. The peptides with chiral (E)-α,β-unsaturated γ-amino acids derived from α-L-amino acids adopt a (P)-β-double helix, whereas peptides consisting of (E)-α,β-unsaturated γ-amino acids derived from α-D-amino acids adopt an (M)-β-double helix conformation. The circular dichroism (CD) signature of the (P) and (M)-β-double helices and the stability of these peptides at higher temperatures were examined. Furthermore, ion transport studies suggested that these peptides transport ions across membranes. Even though the structural analogy suggests that these new β-double helices are structurally different from those of the α-peptide β-double helices, they retain ion transport activity. The results reported here may open new avenues in the design of functional foldamers.
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Affiliation(s)
- Saikat Pahan
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Sanjit Dey
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Gijo George
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Souvik Panda Mahapatra
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - DRGKoppalu R Puneeth Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
| | - Hosahudya N Gopi
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
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2
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He L, Zhang T, Zhu C, Yan T, Liu J. Crown Ether-Based Ion Transporters in Bilayer Membranes. Chemistry 2023; 29:e202300044. [PMID: 36723493 DOI: 10.1002/chem.202300044] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 01/28/2023] [Accepted: 01/30/2023] [Indexed: 02/02/2023]
Abstract
Bilayer membranes that enhance the stability of the cell are essential for cell survival, separating and protecting the interior of the cell from its external environment. Membrane-based channel proteins are crucial for sustaining cellular activities. However, dysfunction of these proteins would induce serial channelopathies, which could be substituted by artificial ion channel analogs. Crown ethers (CEs) are widely studied in the area of artificial ion channels owing to their intrinsic host-guest interaction with different kinds of organic and inorganic ions. Other advantages such as lower price, chemical stability, and easier modification also make CE a research hotspot in the field of synthetic transmembrane nanopores. And numerous CEs-based membrane-active synthetic ion channels were designed and fabricated in the past decades. Herein, the recent progress of CEs-based synthetic ion transporters has been comprehensively summarized in this review, including their design principles, functional mechanisms, controllable properties, and biomedical applications. Furthermore, this review has been concluded by discussing the future opportunities and challenges facing this research field. It is anticipated that this review could offer some inspiration for the future fabrication of novel CEs-derived ion transporters with more advanced structures, properties, and practical applications.
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Affiliation(s)
- Lei He
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, 311121, Hangzhou, P. R. China
| | - Tianlong Zhang
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, 311121, Hangzhou, P. R. China
| | - Canhong Zhu
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, 311121, Hangzhou, P. R. China
| | - Tengfei Yan
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, 311121, Hangzhou, P. R. China
| | - Junqiu Liu
- College of Material, Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Key Laboratory of Organosilicon Material Technology of Zhejiang Province, Hangzhou Normal University, 311121, Hangzhou, P. R. China
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3
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Abstract
Several life-threatening diseases, also known as 'Channelopathies' are linked to irregularities in ion transport proteins. Significant research efforts have fostered the development of artificial transport systems that facilitates to restore the functions of impaired natural transport proteins. Indeed, a few of these artificial ionophores demonstrate the rare combination of transmembrane ion transport and important biological activity, offering early promises of suitability in 'channel replacement therapy'. In this review, structural facets and functions of both cationophores and anionophores are discussed. Ionophores that are toxic to various bacteria and yeast, could be exploited as antimicrobial agent. Nevertheless, few non-toxic ionophores offer the likelihood of treating a wide range of genetic diseases caused by the gene mutations. In addition, their ability to disrupt cellular homeostasis and to alter lysosomal pH endow ionophores as promising candidates for cancer treatment. Overall, critically outlining the advances in artificial ionophores in terms of in vitro ion transport, possible modes of action and biological activities enables us to propose possible future roadmaps in this research area.
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Affiliation(s)
- Arundhati Roy
- Department of Pharmacy, Ludwig-Maximilians-Universität München, Butenandtstraße 5-13, 81377, Munich, Germany
| | - Pinaki Talukdar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411008, India
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4
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Crown ether modified peptides: Length and crown ring size impact on membrane interactions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2020; 1862:183261. [DOI: 10.1016/j.bbamem.2020.183261] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 02/28/2020] [Accepted: 03/04/2020] [Indexed: 11/24/2022]
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5
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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] [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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6
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Faggi E, Luis SV, Alfonso I. Sensing, Transport and Other Potential Biomedical Applications of Pseudopeptides. Curr Med Chem 2018; 26:4065-4097. [PMID: 29493442 DOI: 10.2174/0929867325666180301091040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Revised: 01/17/2018] [Accepted: 01/20/2018] [Indexed: 11/22/2022]
Abstract
Pseudopeptides are privileged synthetic molecules built from the designed combination of peptide-like and abiotic artificial moieties. Consequently, they are benefited from the advantages of both families of chemical structures: modular synthesis, chemical and functional diversity, tailored three-dimensional structure, usually high stability in biological media and low non-specific toxicity. Accordingly, in the last years, these compounds have been used for different biomedical applications, ranging from bio-sensing, ion transport, the molecular recognition of biologically relevant species, drug delivery or gene transfection. This review highlights a selection of the most remarkable and recent advances in this field.
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Affiliation(s)
- Enrico Faggi
- Department of Biological Chemistry and Molecular Modelling, Institute of Advanced Chemistry of Catalonia, Consejo Superior de Investigaciones Cientificas, Barcelona, Spain
| | - Santiago V Luis
- Department of Inorganic and Organic Chemistry, Universitat Jaume I, Castellon, Spain
| | - Ignacio Alfonso
- Department of Biological Chemistry and Molecular Modelling, Institute of Advanced Chemistry of Catalonia, Consejo Superior de Investigaciones Cientificas, Barcelona, Spain
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7
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Synthesis and spectral properties of new ethylene glycol bridged oxazol-5-ones: High Stokes' shift fluorophores sensitive to solvent polarity. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.092] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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8
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Paquet-Côté PA, Tuck KL, Paradis JP, Graham B, Voyer N. Modulating the activity of membrane-active peptides through Zn(II) complexation. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.10.066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Affiliation(s)
| | - Normand Voyer
- Département de chimie and PROTEO, Université Laval , Québec, Canada
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10
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Jóźwiak M, Tyczyńska M, Bald A. The physicochemical properties and viscosity behavior of crown ether 18C6 in the mixture of water with N,N -dimethylformamide. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.12.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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11
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Calvelo M, Vázquez S, García-Fandiño R. Molecular dynamics simulations for designing biomimetic pores based on internally functionalized self-assembling α,γ-peptide nanotubes. Phys Chem Chem Phys 2016; 17:28586-601. [PMID: 26443433 DOI: 10.1039/c5cp04200c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
A molecular dynamics study on internally functionalized peptide nanotubes composed of α- and γ-amino acids self-assembled in lipid bilayers is presented. One of the main advantages of peptide nanotubes composed of γ-amino acids is that the properties of their inner cavities can be tuned by introducing different functions on β-carbon of the γ-amino acid. In the work described here we studied the effect of the presence of different numbers of hydroxyl groups in different positions in the lumen of these channels when they are inserted into a lipid bilayer and assessed how they affect the structural and dynamic behavior of the modified peptide nanotubes as well as the transmembrane transport of different ions. The results provided atomic information about the effect of polar groups on the dynamic, structural and transport properties of this type of peptidic channel upon insertion into lipid bilayers, projecting a promising future for their use as biomimetic channels when properly inner-derivatized. Furthermore, the chemical versatility of the hydroxyl groups in the lumen of the peptide nanotubes would enable appealing applications for these channels, such as a controlled method for the activation/inactivation of the transmembrane transport along the nanopore.
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Affiliation(s)
- Martín Calvelo
- Department of Organic Chemistry, Center for Research in Biological Chemistry and Molecular Materials, Campus Vida, Santiago de Compostela University, E-15782 Santiago de Compostela, Spain.
| | - Saulo Vázquez
- Department of Physical Chemistry, Center for Research in Biological Chemistry and Molecular Materials, Campus Vida, Santiago de Compostela University, E-15782 Santiago de Compostela, Spain
| | - Rebeca García-Fandiño
- Department of Organic Chemistry, Center for Research in Biological Chemistry and Molecular Materials, Campus Vida, Santiago de Compostela University, E-15782 Santiago de Compostela, Spain.
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12
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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] [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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13
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Tripathi G, Ramanathan G. Structures and conformation of a benzo-12-crown-4 containing dipeptide. Biopolymers 2015; 104:148-55. [PMID: 25645572 DOI: 10.1002/bip.22614] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 01/10/2015] [Accepted: 01/20/2015] [Indexed: 11/08/2022]
Abstract
Crystal structures of the dipeptide Boc-12-Crown-4-L-DOPA-Gly-OMe (chi) and Boc-12-Crown-4-D/L-DOPA-Gly-OMe (rac) were solved by single crystal X-ray diffraction. Analysis of the packing differences in the crystal reveals that the presence of a water molecule in chi enables intermolecular contacts with the solvent that result in a different conformation of the dipeptide backbone itself. An uncommon N-H…N interaction stabilizes the peptide in its solid state.
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Affiliation(s)
- Garima Tripathi
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, India, 208016
| | - Gurunath Ramanathan
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, India, 208016
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14
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Abstract
Seventeen derivatives of α- and β-cyclodextrins were prepared from the cyclodextrin per-6-azide by "click" cyclization with terminal alkynes. Sixteen of these "half-channel" compounds showed significant activity as ion channels in planar bilayer members as assessed by the voltage-clamp technique. Activity ranged from persistent square-top openings to highly erratic conductance; mixed behaviours were evident in virtually all data recorded. Some of the erratic behaviours were shown to follow an apparent power-law distribution of open duration times. The activities observed for the suite were summarized using a model-free activity grid method which displays conductance, duration, and opening behaviour. The overall activity shows the clustering of conductance-duration indicating that activity arises from system properties rather that solely as a property of the compound. The activity grids also support an analysis of structure-activity relationships as they apply to the global behaviour of the compounds and reveal the complexity of a single structure change in controlling the distribution of concurrent conductance behaviours. Transient blockage of channel activity by the hydrophobic guest of the cyclodextrin (1-adamantyl carboxylate) is consistent with the formation of an end-to-end dimer channel among several other competing and interconverting structures.
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Affiliation(s)
- Jonathan K W Chui
- Department of Chemistry, University of Victoria, PO Box 3065, Victoria, BC, Canada V8W 3P6.
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15
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Fillion M, Noël M, Lorin A, Voyer N, Auger M. Investigation of the mechanism of action of novel amphipathic peptides: insights from solid-state NMR studies of oriented lipid bilayers. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2173-9. [PMID: 24508758 DOI: 10.1016/j.bbamem.2014.01.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 01/26/2014] [Accepted: 01/29/2014] [Indexed: 12/12/2022]
Abstract
We have investigated in the present study the effect of both non-selective and selective cationic 14-mer peptides on the lipid orientation of DMPC bilayers by (31)P solid-state nuclear magnetic resonance (NMR) spectroscopy. Depending on the position of substitution, these peptides adopt mainly either an α-helical structure able to permeabilize DMPC and DMPG vesicles (non-selective peptides) or an intermolecular β-sheet structure only able to permeabilize DMPG vesicles (selective peptides). Several systems have been investigated, namely bilayers mechanically oriented between glass plates as well as bicelles oriented with their normal perpendicular or parallel to the external magnetic field. The results have been compared with spectral simulations with the goal of elucidating the difference in the interaction of these two types of peptides with zwitterionic lipid bilayers. The results indicate that the perturbation induced by selective peptides is much greater than that induced by non-selective peptides in all the lipid systems investigated, and this perturbation has been associated to the aggregation of the selective β-sheet peptides in these systems. On the other hand, the oriented lipid spectra obtained in the presence of non-selective peptides suggest the presence of toroidal pores. This article is part of a Special Issue entitled: Interfacially Active Peptides and Proteins. Guest Editors: William C. Wimley and Kalina Hristova.
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Affiliation(s)
- Matthieu Fillion
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, la structure et l'ingénierie des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC G1V 0A6, Canada
| | - Mathieu Noël
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, la structure et l'ingénierie des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC G1V 0A6, Canada
| | - Aurélien Lorin
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, la structure et l'ingénierie des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC G1V 0A6, Canada
| | - Normand Voyer
- Department of Chemistry, PROTEO, Université Laval, Québec, QC G1V 0A6, Canada
| | - Michèle Auger
- Department of Chemistry, Regroupement québécois de recherche sur la fonction, la structure et l'ingénierie des protéines (PROTEO), Centre de recherche sur les matériaux avancés (CERMA), Centre québécois sur les matériaux fonctionnels (CQMF), Université Laval, Québec, QC G1V 0A6, Canada.
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Abstract
Ion channels provide a conductance pathway for the passive transport of ions across membranes. These functional molecules perform key tasks in biological systems such as neuronal signaling, muscular control, and sensing. Recently, function-oriented synthesis researchers began to focus on ion channels with the goal of modifying the function of existing ion channels (ion selectivity, gating) or creating new channels with novel functions. Both approaches, ion channel engineering and de novo design, have involved synthetic chemists, biochemists, structural biologists, and neurochemists. Researchers characterize the function of ion channels by measuring their conductance in samples of biological membranes (patch clamp) or artificial membranes (planar lipid bilayers). At the single molecule level, these measurements require special attention to the purity of the sample, a challenge that synthetic chemists should be aware of. Ideally, researchers study the function of channels while also acquiring structural data (X-ray, NMR) to understand and predict how synthetic modifications alter channel function. Long-term oriented researchers would like to apply synthetic ion channels to single molecule sensing and to implantat these synthetic systems in living organisms as tools or for the treatment of channelopathies. In this Account, we discuss our own work on synthetic ion channels and explain the shift of our research focus from a de novo design of oligo-THFs and oligo-THF-amino acids to ion channel engineering. We introduce details about two biological lead structures for ion channel engineering: the gramicidin β(6,3) helix as an example of a channel with a narrow ion conductance pathway and the outer membrane porins (OmpF, OmpG) with their open β-barrel structure. The increase and the reversal of ion selectivity of these systems and the hydrophobic match/mismatch of the channel with the phospholipid bilayer are of particular interest. For engineering ion channels, we need to supplement the single-point attachment of a synthetic modulator with the synthesis of a more challenging two-point attachment. The successful function-oriented synthesis of ion channels will require interdisciplinary efforts that include new electrophysiology techniques, efficient synthesis (peptide/protein/organic), and good structural analysis.
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Affiliation(s)
- Philipp Reiß
- Fachbereich Chemie, Philipps-Universität Marburg, Hans Meerwein Strasse, 35032 Marburg, Germany
| | - Ulrich Koert
- Fachbereich Chemie, Philipps-Universität Marburg, Hans Meerwein Strasse, 35032 Marburg, Germany
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17
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Otis F, Auger M, Voyer N. Exploiting peptide nanostructures to construct functional artificial ion channels. Acc Chem Res 2013; 46:2934-43. [PMID: 23627544 DOI: 10.1021/ar400044k] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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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18
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Jradi FM, El-Ballouli AO, Al-Sayah MH, Kaafarani BR. Synthesis and binding investigations of novel crown-ether derivatives of phenanthro[4,5-abc]phenazine and quinoxalino[2′,3′:9,10]phenanthro[4,5-abc]phenazine. Supramol Chem 2013. [DOI: 10.1080/10610278.2013.817577] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Fadi M. Jradi
- Department of Chemistry, American University of Beirut, Beirut, 1107-2020, Lebanon
| | - Ala'a O. El-Ballouli
- Department of Chemistry, American University of Beirut, Beirut, 1107-2020, Lebanon
| | - Mohammad H. Al-Sayah
- Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, P.O. Box: 26666, Sharjah, United Arab Emirates
| | - Bilal R. Kaafarani
- Department of Chemistry, American University of Beirut, Beirut, 1107-2020, Lebanon
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19
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Rydberg J, Baltzer L, Sarojini V. Intrinsically unstructured proteins by design-electrostatic interactions can control binding, folding, and function of a helix-loop-helix heterodimer. J Pept Sci 2013; 19:461-9. [PMID: 23813758 DOI: 10.1002/psc.2520] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2013] [Revised: 04/16/2013] [Accepted: 04/19/2013] [Indexed: 11/10/2022]
Abstract
Intrinsically disordered proteins that exist as unordered monomeric structures in aqueous solution at pH 7 but fold into four-helix bundles upon binding to recognized polypeptide targets have been designed. NMR and CD spectra of the monomeric polypeptides show the hallmarks of unordered structures, whereas in the bound state they are highly helical. Analytical ultracentrifugation data shows that the polypeptides bind to their targets to form exclusively heterodimers at neutral pH. To demonstrate the relationship between binding, folding, and function, a catalytic site for ester hydrolysis was introduced into an unordered and largely inactive monomer, but that was structured and catalytically active in the presence of a specific polypeptide target. Electrostatic interactions between surface-exposed residues inhibited the binding and folding of the monomers at pH 7. Charge-charge repulsion between ionizable amino acids was thus found to be sufficient to disrupt binding between polypeptide chains despite their inherent propensities for structure formation and may be involved in the folding and function of inherently disordered proteins in biology.
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Affiliation(s)
- Johan Rydberg
- Department of Chemistry-IFM, Linköping University, 581 83, Linköping, Sweden
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20
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Alfonso I, Quesada R. Biological activity of synthetic ionophores: ion transporters as prospective drugs? Chem Sci 2013. [DOI: 10.1039/c3sc50882j] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
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21
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Muraoka T, Shima T, Hamada T, Morita M, Takagi M, Tabata KV, Noji H, Kinbara K. Ion permeation by a folded multiblock amphiphilic oligomer achieved by hierarchical construction of self-assembled nanopores. J Am Chem Soc 2012; 134:19788-94. [PMID: 23145887 DOI: 10.1021/ja308342g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A multiblock amphiphilic molecule 1, with a tetrameric alternating sequence of hydrophilic and hydrophobic units, adopts a folded structure in a liposomal membrane like a multipass transmembrane protein, and is able to transport alkali metal cations through the membrane. Hill's analysis and conductance measurements, analyzed by the Hille equation, revealed that the tetrameric assembly of 1 forms a 0.53 nm channel allowing for permeation of cations. Since neither 3, bearing flexible hydrophobic units and forming no stacked structures in the membrane, nor 2, a monomeric version of 1, is able to transport cations, the folded conformation of 1 in the membrane is likely essential for realizing its function. Thus, function and hierarchically formed higher-order structures of 1, is strongly correlated with each other like proteins and other biological macromolecules.
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Affiliation(s)
- Takahiro Muraoka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan.
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22
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Lorin A, Noël M, Provencher MÈ, Turcotte V, Cardinal S, Lagüe P, Voyer N, Auger M. Determining the mode of action involved in the antimicrobial activity of synthetic peptides: a solid-state NMR and FTIR study. Biophys J 2012; 103:1470-9. [PMID: 23062339 DOI: 10.1016/j.bpj.2012.08.055] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Revised: 08/20/2012] [Accepted: 08/28/2012] [Indexed: 10/27/2022] Open
Abstract
We have previously shown that leucine to lysine substitution(s) in neutral synthetic crown ether containing 14-mer peptide affect the peptide structure and its ability to permeabilize bilayers. Depending on the substitution position, the peptides adopt mainly either a α-helical structure able to permeabilize dimyristoylphosphatidylcholine (DMPC) and dimyristoylphosphatidylglycerol (DMPG) vesicles (nonselective peptides) or an intermolecular β-sheet structure only able to permeabilize DMPG vesicles (selective peptides). In this study, we have used a combination of solid-state NMR and Fourier transform infrared spectroscopy to investigate the effects of nonselective α-helical and selective intermolecular β-sheet peptides on both types of bilayers. (31)P NMR results indicate that both types of peptides interact with the headgroups of DMPC and DMPG bilayers. (2)H NMR and Fourier transform infrared results reveal an ordering of the hydrophobic core of bilayers when leakage is noted, i.e., for DMPG vesicles in the presence of both types of peptides and DMPC vesicles in the presence of nonselective peptides. However, selective peptides have no significant effect on the ordering of DMPC acyl chains. The ability of these 14-mer peptides to permeabilize lipid vesicles therefore appears to be related to their ability to increase the order of the bilayer hydrophobic core.
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Affiliation(s)
- Aurélien Lorin
- Département de chimie, PROTEO (Regroupement Québécois de Recherche sur la Fonction, la Structure et l'Ingénierie des Protéines), CERMA (Centre de Recherche sur les Matériaux Avancés), Université Laval, Québec, Québec, Canada
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23
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Chénard S, Barberis C, Otis F, Paquin JF, Martel J, Banville C, Voyer N. Synthesis of an anion-binding amino acid. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.11.057] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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24
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Chui JKW, Fyles TM. Ionic conductance of synthetic channels: analysis, lessons, and recommendations. Chem Soc Rev 2012; 41:148-75. [DOI: 10.1039/c1cs15099e] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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25
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Lorin A, Noël M, Provencher MÈ, Turcotte V, Masson C, Cardinal S, Lagüe P, Voyer N, Auger M. Revisiting peptide amphiphilicity for membrane pore formation. Biochemistry 2011; 50:9409-20. [PMID: 21942823 DOI: 10.1021/bi201335t] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
It has previously been shown that an amphipathic de novo designed peptide made of 10 leucines and four phenylalanines substituted with crown ethers induces vesicle leakage without selectivity. To gain selectivity against negatively charged dimyristoylphosphatidylglycerol (DMPG) bilayers, one or two leucines of the peptide were substituted with positively charged residues at each position. All peptides induce significant calcein leakage of DMPG vesicles. However, some peptides do not induce significant leakage of zwitterionic dimyristoylphosphatidylcholine vesicles and are thus active against only bacterial model membranes. The intravesicular leakage is induced by pore formation instead of membrane micellization. Nonselective peptides are mostly helical, while selective peptides mainly adopt an intermolecular β-sheet structure. This study therefore demonstrates that the position of the lysine residues significantly influences the secondary structure and bilayer selectivity of an amphipathic 14-mer peptide, with β-sheet peptides being more selective than helical peptides.
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Affiliation(s)
- Aurélien Lorin
- Département de chimie, Regroupement québécois de recherche sur la fonction, la structure et l'ingénierie des protéines, Centre de recherche sur les matériaux avancés, Université Laval, Québec, Québec, Canada G1V 0A6
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26
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Two polymorphs of phenanthro[4,5-abc]phenazine-18-crown-6: Preparation, X-ray diffraction and DFT studies. J Mol Struct 2011. [DOI: 10.1016/j.molstruc.2011.04.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Otis F, Racine-Berthiaume C, Voyer N. How Far Can a Sodium Ion Travel within a Lipid Bilayer? J Am Chem Soc 2011; 133:6481-3. [DOI: 10.1021/ja110336s] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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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28
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Abstract
In recent years there has been an abundance of research into the potential of helical peptides to influence cell function. These peptides have been used to achieve a variety of different outcomes from cell repair to cell death, depending upon the peptide sequence and the nature of its interactions with cell membranes and membrane proteins. In this critical review, we summarise several mechanisms by which helical peptides, acting as either transporters, inhibitors, agonists or antibiotics, can have significant effects on cell membranes and can radically affect the internal mechanisms of the cell. The various approaches to peptide design are discussed, including the role of naturally-occurring proteins in the design of these helical peptides and current breakthroughs in the use of non-natural (and therefore more stable) peptide scaffolds. Most importantly, the current successful applications of these peptides, and their potential uses in the field of medicine, are reviewed (131 references).
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Affiliation(s)
- Andrew J Beevers
- Department of Chemistry, University of Warwick, Coventry, CV4 7AL, UK
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29
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Lodeiro C, Capelo JL, Mejuto JC, Oliveira E, Santos HM, Pedras B, Nuñez C. Light and colour as analytical detection tools: A journey into the periodic table using polyamines to bio-inspired systems as chemosensors. Chem Soc Rev 2010; 39:2948-76. [DOI: 10.1039/b819787n] [Citation(s) in RCA: 178] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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30
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Wicklein A, Lang A, Muth M, Thelakkat M. Swallow-Tail Substituted Liquid Crystalline Perylene Bisimides: Synthesis and Thermotropic Properties. J Am Chem Soc 2009; 131:14442-53. [DOI: 10.1021/ja905260c] [Citation(s) in RCA: 199] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- André Wicklein
- Department of Macromolecular Chemistry I, Applied Functional Polymers, Universität Bayreuth, Universitätsstraβe 30, 95440 Bayreuth, Germany
| | - Andreas Lang
- Department of Macromolecular Chemistry I, Applied Functional Polymers, Universität Bayreuth, Universitätsstraβe 30, 95440 Bayreuth, Germany
| | - Mathis Muth
- Department of Macromolecular Chemistry I, Applied Functional Polymers, Universität Bayreuth, Universitätsstraβe 30, 95440 Bayreuth, Germany
| | - Mukundan Thelakkat
- Department of Macromolecular Chemistry I, Applied Functional Polymers, Universität Bayreuth, Universitätsstraβe 30, 95440 Bayreuth, Germany
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31
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Ouellet M, Voyer N, Auger M. Membrane interactions and dynamics of a 21-mer cytotoxic peptide: a solid-state NMR study. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1798:235-43. [PMID: 19703408 DOI: 10.1016/j.bbamem.2009.07.029] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2009] [Revised: 07/06/2009] [Accepted: 07/30/2009] [Indexed: 11/29/2022]
Abstract
We have investigated the membrane interactions and dynamics of a 21-mer cytotoxic model peptide that acts as an ion channel by solid-state NMR spectroscopy. To shed light on its mechanism of membrane perturbation, (31)P and (2)H NMR experiments were performed on 21-mer peptide-containing bicelles. (31)P NMR results indicate that the 21-mer peptide stabilizes the bicelle structure and orientation in the magnetic field and perturbs the lipid polar head group conformation. On the other hand, (2)H NMR spectra reveal that the 21-mer peptide orders the lipid acyl chains upon binding. (15)N NMR experiments performed in DMPC bilayers stacked between glass plates also reveal that the 21-mer peptide remains at the bilayer surface. (15)N NMR experiments in perpendicular DMPC bicelles indicate that the 21-mer peptide does not show a circular orientational distribution in the bicelle planar region. Finally, (13)C NMR experiments were used to study the 21-mer peptide dynamics in DMPC multilamellar vesicles. By analyzing the (13)CO spinning sidebands, the results show that the 21-mer peptide is immobilized upon membrane binding. In light of these results, we propose a model of membrane interaction for the 21-mer peptide where it lies at the bilayer surface and perturbs the lipid head group conformation.
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Affiliation(s)
- Marise Ouellet
- Département de Chimie, PROTEO (Regroupement Québécois de Recherche sur la Fonction, la Structure et l'Ingénierie des Protéines), CERMA (Centre de Recherche sur les Matériaux Avancés), Université Laval, Québec, Québec, Canada G1V 0A6
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32
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Kralj M, Tusek-Bozić L, Frkanec L. Biomedical potentials of crown ethers: prospective antitumor agents. ChemMedChem 2009; 3:1478-92. [PMID: 18683175 DOI: 10.1002/cmdc.200800118] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Crown ethers are of enormous interest and importance in chemistry, biochemistry, materials science, catalysis, separation, transport and encapsulated processes, as well as in the design and synthesis of various synthetic systems with specific properties, diverse capabilities, and programmable functions. Classical crown ethers are macrocyclic polyethers that contain 3-20 oxygen atoms separated from each other by two or more carbon atoms. They are exceptionally versatile in selectively binding a range of metal ions and a variety of organic neutral and ionic species. Crown ethers are currently being studied and used in a variety of applications beyond their traditional place in chemistry. This review presents additional applications and the ever-increasing biomedical potentials of these intriguing compounds, with particular emphasis on the prospects of their relevance as anticancer agents. We believe that further research in this direction should be encouraged, as crown compounds could either induce toxicities that are different from those of conventional antitumor drugs, or complement drugs in current use, thereby providing a valuable adjunct to therapy.
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Affiliation(s)
- Marijeta Kralj
- Division of Molecular Medicine, Ruder Bosković Institute, Bijenicka cesta 54, 10002 Zagreb, Croatia.
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33
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Wang W, Li R, Gokel GW. “Aplosspan:” a bilayer-length, ion-selective ionophore that functions in phospholipid bilayers. Chem Commun (Camb) 2009:911-3. [DOI: 10.1039/b816819a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Tsikolia M, Hall AC, Suarez C, Nylander ZO, Wardlaw SM, Gibson ME, Valentine KL, Onyewadume LN, Ahove DA, Woodbury M, Mongare MM, Hall CD, Wang Z, Draghici B, Katritzky AR. Synthesis and characterization of a redox-active ion channel supporting cation flux in lipid bilayers. Org Biomol Chem 2009; 7:3862-70. [DOI: 10.1039/b907350g] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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35
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36
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Elliott EK, Stine KJ, Gokel GW. Air-water interfacial behavior of amphiphilic peptide analogs of synthetic chloride ion transporters. J Memb Sci 2008; 321:43-50. [PMID: 19169376 DOI: 10.1016/j.memsci.2008.01.048] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
A family of heptapeptide-based chloride transporters (called synthetic anion transporters, SATs) were designed to insert into phospholipid membrane bilayers and form pores. Many of these compounds have proved to be chloride selective transporters. The transporters were designed to incorporate hydrophilic heptapeptides that could serves as headgroups and hydrocarbon tails that could serve as hydrophobic membrane anchors. Insertion of the SAT molecules into a bilayer requires approach to and insertion at the aqueous-membrane surface. The studies reported here were conducted to model and understand this process by studying SAT behavior at the air-water interface. A Langmuir trough was used to obtain surface pressure-area isotherm data. These data for amphiphilic SATs were augmented by Brewster angle microscopy (BAM), molecular modeling, and calculations of the hydrophobicity parameter log P. The analyses showed that the heptapeptide (hydrophilic) module of the SAT molecule rested on the water surface while the dialkyl (hydrophobic) tails oriented themselves in the air, perpendicular to the water surface. Brewster angle microscopy visually confirmed a high order of molecular organization. Results from these studies are consistent with the previously proposed mechanism of SAT membrane insertion and pore formation.
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Affiliation(s)
- Elizabeth K Elliott
- Department of Chemistry, Washington University, St. Louis, MO 63130, United States
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37
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Dutot L, Gaucher A, Elkassimi K, Drapeau J, Wakselman M, Mazaleyrat JP, Peggion C, Formaggio F, Toniolo C. Synthesis and Characterisation of Helical β-Peptide Architectures that Contain (S)-β3-HDOPA(Crown Ether) Derivatives. Chemistry 2008; 14:3154-63. [DOI: 10.1002/chem.200701360] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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38
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Wright K, Lohier JF, Wakselman M, Mazaleyrat JP, Formaggio F, Peggion C, De Zotti M, Toniolo C. Synthesis of enantiopure, axially chiral, Cα-tetrasubstituted α-amino acids with binaphthyl-based crowned side chains and 3D-structural analysis of their peptides. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.01.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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39
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Wright K, Anddad R, Lohier JF, Steinmetz V, Wakselman M, Mazaleyrat JP, Formaggio F, Peggion C, De Zotti M, Keiderling TA, Huang R, Toniolo C. Synthesis, Ion Complexation Study, and 3D-Structural Analysis of Peptides Based on Crown-Carrier,Cα-Methyl-L-DOPA Amino Acids. European J Org Chem 2008. [DOI: 10.1002/ejoc.200700917] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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40
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Boudreault PL, Arseneault M, Otis F, Voyer N. Nanoscale tools to selectively destroy cancer cells. Chem Commun (Camb) 2008:2118-20. [DOI: 10.1039/b800528a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Biron E, Voyer N. Towards sequence selective DNA binding: design, synthesis and DNA binding studies of novel bis-porphyrin peptidic nanostructures. Org Biomol Chem 2008; 6:2507-15. [DOI: 10.1039/b803281e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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42
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Abstract
Amphiphilic peptides typically consist of a peptide portion that may be 5-25 (or more) amino acids in length. The hydrophobic portion may be a single fatty acid residue, but can also be more elaborate. The main focus of this article lies on the family of synthetic anion binders (SATs) of the general structure (R(1))(2)N-COCH(2)OCH(2)CO-(Aaa)(n)-OR(3). The most-common R(1) group is the octadecyl (C(18)H(37)) group. The most studied peptide sequence in this family is (Gly)(3)-Pro-(Gly)(3), although different sequences (and longer and shorter peptides) have been prepared as well. The C-terminal ester residue providing the most effective anion release from liposomes is heptyl (C(7)H(15)), although many others have been examined. The compound (C(18)H(37))(2)N-COCH(2)OCH(2)CO-(Gly)(3)-Pro-(Gly)(3)-OBn (Bn=benzyl) was found to mediate Cl(-) transport in mouse epithelial cells.
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Affiliation(s)
- Carl R Yamnitz
- Department of Chemistry, Washington University, Saint Louis, MO 63130, USA
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43
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Blanchette JP, Ferland P, Voyer N. Preparation of large macrocyclic peptides using the oxime resin. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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44
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Montero A, Albericio F, Royo M, Herradón B. Synthesis of a 24-Membered Cyclic Peptide-Biphenyl Hybrid. European J Org Chem 2007. [DOI: 10.1002/ejoc.200600833] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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45
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Paradis-Bleau C, Cloutier I, Lemieux L, Sanschagrin F, Laroche J, Auger M, Garnier A, Levesque RC. Peptidoglycan lytic activity of thePseudomonas aeruginosaphage ÏKZ gp144 lytic transglycosylase. FEMS Microbiol Lett 2007; 266:201-9. [PMID: 17233731 DOI: 10.1111/j.1574-6968.2006.00523.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
The gp144 endolysin gene from the Pseudomonas aeruginosa phage phiKZ was cloned and studies of gp144 expression into Escherichia coli showed host cell lysis. The gp144 protein was purified directly from the culture supernatant and from the bacterial cell pellet and showed in vitro antibacterial lytic activity against P. aeruginosa bacteria and degraded purified peptidoglycan of Gram-negative bacteria. MS analysis identified the gp144 peptidoglycan cleavage site and confirmed a lytic transglycosylase enzyme. Studies of gp144 expression in the presence of sodium azide (NaN(3)), an inhibitor of the protein export machinery, and into an E. coli MM52 secA(ts) mutant at permissive and restrictive temperatures showed that gp144 was secreted independently of the Sec system. The solution conformation of purified gp144 analyzed by circular dichroism spectroscopy was 61% in alpha-helical content, and showed a 72% decrease when interacting with dimyristoylphosphatidylglycerol (DMPG), one of the major components of bacterial membranes and less than 10% with dimyristoylphosphatidylcholine (DMPC) found in eukaryotic membranes. Membrane vesicles of DMPG anionic lipids containing calcein indicated that gp144 caused a rapid release of fluorescent calcein when interacting with synthetic membranes. These results indicated that gp144 from phiKZ is a lytic transglycosylase capable of interacting with and disorganizing bacterial membranes and has potential as an antipseudomonal in phage therapy.
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Affiliation(s)
- Catherine Paradis-Bleau
- Département de Biologie Médicale, Faculté de Médecine, Universite Laval, Sainte-Foy, Quebec, Canada
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46
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Martin Boutin J, Richer J, Tremblay M, Bissonette V, Voyer N. Synthesis and characterization of peptide nanostructures chemisorbed on gold. NEW J CHEM 2007. [DOI: 10.1039/b617877d] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Abstract
The compelling chemical goal of modeling protein channel behavior has led to synthetic compounds that are true ion channels. Although they largely lack the selectivity and sophistication of highly evolved proteins, they successfully perform a variety of biological functions. This tutorial review describes these novel structures and their activity in living systems. Different channel structures show antibacterial to anticancer activity when tested against a variety of cell types.
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Affiliation(s)
- George W Gokel
- Department of Chemistry, University of Missouri, Saint Louis, MO 63121, USA.
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48
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Boudreault PL, Voyer N. Synthesis, characterization and cytolytic activity of α-helical amphiphilic peptide nanostructures containing crown ethers. Org Biomol Chem 2007; 5:1459-65. [PMID: 17464417 DOI: 10.1039/b702076g] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Many natural alpha-helical amphiphilic peptides are known to have lytic activity toward different cells. Herein, we describe the synthesis and the characterization of synthetic alpha-helical amphiphilic peptide nanostructures containing crown ethers, as well as the modulation of their cytolytic activity by adding different acidic dipeptide chains at the N- or C-terminus.
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Affiliation(s)
- Pierre-Luc Boudreault
- Département de chimie and Centre de recherche sur la fonction, la structure et l'ingénierie des protéines, Faculté des sciences et génie, Université Laval, Québec, CanadaG1K 7P4
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49
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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-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] [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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Abstract
This critical review covers synthetic ion channels and pores created between January 2004 and December 2005 comprehensively. The discussion of a rich collection of structural motifs may particularly appeal to organic, biological, supramolecular and polymer chemists. Functions addressed include ion selectivity and molecular recognition, as well as responsiveness to light, heat, voltage and membrane composition. The practical applications involved concern certain topics in medicinal chemistry (antibiotics, drug delivery), catalysis and sensing. An introduction to principles and methods is provided for the non-specialist; some new sources of inspiration from fields beyond chemistry are highlighted.
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Affiliation(s)
- Adam L Sisson
- Department of Organic Chemistry, University of Geneva, Geneva, Switzerland
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