1
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Nakatani T, Koga A, Goto S, Inoue M, Shigedomi K, Seki K, Araki K, Taira J, Kodama H, Osada S. Importance of isoleucine residue in ion channel formation ability of 11-residue peptaibols. Bioorg Med Chem 2024; 110:117839. [PMID: 39029438 DOI: 10.1016/j.bmc.2024.117839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2024] [Revised: 07/10/2024] [Accepted: 07/11/2024] [Indexed: 07/21/2024]
Abstract
Peptaibols are a class of short peptides, typically 7 to 20 amino acids long, characterized by noncanonical amino acid residues such as aminoisobutyric acid (Aib). Although the helix length is shorter than the membrane thickness, the 11-residue peptaibol trichorovin-XII (TV-XII) can form ion channels in membranes. Assuming that a higher proportion of isoleucine (Ile) relative to leucine (Leu) residues is crucial for maintaining the ion channel activity of TV-XII, peptide analogs of TV-XII with varying Ile content were designed, synthesized, and evaluated. The secondary structure of all derivatives under hydrophobic conditions was confirmed by CD measurement as an α-helix-like β-bend ribbon spiral structure. The most stable ion channel activity was found in compound 4a with maximum Ile. Furthermore, the C-terminal Ile analog showed greater ion channel activity compared to the Leu analog. This suggests that the choice between Leu and Ile can influence the expression of ion channel activity, which will be crucial for the de novo designed functional peptides.
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Affiliation(s)
- Taiki Nakatani
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Ami Koga
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Shogo Goto
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Marina Inoue
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Keita Shigedomi
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Kiyohiko Seki
- Department of Applied Biochemistry and Food Science, Faculty of Agriculture, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Kaoru Araki
- Health Care Center, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Junichi Taira
- Department of Bioscience and Bioinformatics, Graduate School of Computer Science and Systems Engineering, Kyushu Institute of Technology, Iizuka 820-8502, Japan
| | - Hiroaki Kodama
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan
| | - Satoshi Osada
- Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, 1 Honjo-machi, Saga 840-8502, Japan.
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2
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Tang Y, Zhang Y, Zhang D, Liu Y, Nussinov R, Zheng J. Exploring pathological link between antimicrobial and amyloid peptides. Chem Soc Rev 2024. [PMID: 39041297 DOI: 10.1039/d3cs00878a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/24/2024]
Abstract
Amyloid peptides (AMYs) and antimicrobial peptides (AMPs) are considered as the two distinct families of peptides, characterized by their unique sequences, structures, biological functions, and specific pathological targets. However, accumulating evidence has revealed intriguing pathological connections between these peptide families in the context of microbial infection and neurodegenerative diseases. Some AMYs and AMPs share certain structural and functional characteristics, including the ability to self-assemble, the presence of β-sheet-rich structures, and membrane-disrupting mechanisms. These shared features enable AMYs to possess antimicrobial activity and AMPs to acquire amyloidogenic properties. Despite limited studies on AMYs-AMPs systems, the cross-seeding phenomenon between AMYs and AMPs has emerged as a crucial factor in the bidirectional communication between the pathogenesis of neurodegenerative diseases and host defense against microbial infections. In this review, we examine recent developments in the potential interplay between AMYs and AMPs, as well as their pathological implications for both infectious and neurodegenerative diseases. By discussing the current progress and challenges in this emerging field, this account aims to inspire further research and investments to enhance our understanding of the intricate molecular crosstalk between AMYs and AMPs. This knowledge holds great promise for the development of innovative therapies to combat both microbial infections and neurodegenerative disorders.
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Affiliation(s)
- Yijing Tang
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Ohio 44325, USA.
| | - Yanxian Zhang
- Division of Endocrinology and Diabetes, Department of Pediatrics, School of Medicine, Stanford University, Palo Alto, CA 94304, USA
| | - Dong Zhang
- The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, Georgia 30332, USA
| | - Yonglan Liu
- Cancer Innovation Laboratory, National Cancer Institute, Frederick, MD 21702, USA
| | - Ruth Nussinov
- Computational Structural Biology Section, Frederick National Laboratory for Cancer Research, Frederick, MD 21702, USA.
- Department of Human Molecular Genetics and Biochemistry Sackler School of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
| | - Jie Zheng
- Department of Chemical, Biomolecular, and Corrosion Engineering, The University of Akron, Ohio 44325, USA.
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3
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Shigedomi K, Osada S, Jelokhani-Niaraki M, Kodama H. Systematic Design and Validation of Ion Channel Stabilization of Amphipathic α-Helical Peptides Incorporating Tryptophan Residues. ACS OMEGA 2021; 6:723-732. [PMID: 33553860 PMCID: PMC7853622 DOI: 10.1021/acsomega.0c05254] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Accepted: 12/17/2020] [Indexed: 05/27/2023]
Abstract
Aromatic interactions such as π-π interaction and cation-π interaction are present in membrane proteins and play important roles in both structure and function. To systematically investigate the effect of aromatic residues on the structural stability and ion permeability of peptide-formed ion channels, we designed several peptides with one or two tryptophan (Trp) residues incorporated at different positions in amphipathic α-helical peptides. Circular dichroism (CD) studies revealed the preferable position of Trp residues for self-association in these designed peptides. Systematically designed di-substituted peptides with two Trps at each helix termini demonstrated intermolecular Trp-Trp interactions caused by aggregation. In the presence of liposomes, Trp on the hydrophilic face of the peptide enhanced interaction with the lipid membrane to increase the amphipathic α-helical contents. Appropriate incorporation and positioning of Trp enabled peptides to form more stable channels and had notable effects with Trp di-substituted peptides. The ion channel forming capability of a series of these peptides showed that the cation-π interactions between Trp and Lys residues in adjacent transmembrane helices contribute to remarkable stabilization of the channel structure.
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Affiliation(s)
- Keita Shigedomi
- Department
of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan
| | - Satoshi Osada
- Department
of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan
| | - Masoud Jelokhani-Niaraki
- Department
of Chemistry and Biochemistry, Wilfrid Laurier
University, Waterloo, Ontario N2L3C5, Canada
| | - Hiroaki Kodama
- Department
of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan
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4
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Niu X, Thaochan N, Hu Q. Diversity of Linear Non-Ribosomal Peptide in Biocontrol Fungi. J Fungi (Basel) 2020; 6:E61. [PMID: 32408496 PMCID: PMC7345191 DOI: 10.3390/jof6020061] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 04/27/2020] [Accepted: 05/09/2020] [Indexed: 12/16/2022] Open
Abstract
Biocontrol fungi (BFs) play a key role in regulation of pest populations. BFs produce multiple non-ribosomal peptides (NRPs) and other secondary metabolites that interact with pests, plants and microorganisms. NRPs-including linear and cyclic peptides (L-NRPs and C-NRPs)-are small peptides frequently containing special amino acids and other organic acids. They are biosynthesized in fungi through non-ribosomal peptide synthases (NRPSs). Compared with C-NRPs, L-NRPs have simpler structures, with only a linear chain and biosynthesis without cyclization. BFs mainly include entomopathogenic and mycoparasitic fungi, that are used to control insect pests and phytopathogens in fields, respectively. NRPs play an important role of in the interactions of BFs with insects or phytopathogens. On the other hand, the residues of NRPs may contaminate food through BFs activities in the environment. In recent decades, C-NRPs in BFs have been thoroughly reviewed. However, L-NRPs are rarely investigated. In order to better understand the species and potential problems of L-NRPs in BFs, this review lists the L-NRPs from entomopathogenic and mycoparasitic fungi, summarizes their sources, structures, activities and biosynthesis, and details risks and utilization prospects.
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Affiliation(s)
- Xiaoyan Niu
- Key Laboratory of Bio-Pesticide Innovation and Application of Guangdong Province, College of Agriculture, South China Agricultural University, Guangzhou 510642, China;
| | - Narit Thaochan
- Pest Management Biotechnology and Plant Physiology Laboratory, Faculty of Natural Resources, Prince of Songkla University, Hat Yai, Songkhla 90110, Thailand;
| | - Qiongbo Hu
- Key Laboratory of Bio-Pesticide Innovation and Application of Guangdong Province, College of Agriculture, South China Agricultural University, Guangzhou 510642, China;
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5
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Das S, Ben Haj Salah K, Djibo M, Inguimbert N. Peptaibols as a model for the insertions of chemical modifications. Arch Biochem Biophys 2018; 658:16-30. [DOI: 10.1016/j.abb.2018.09.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Revised: 09/05/2018] [Accepted: 09/18/2018] [Indexed: 12/13/2022]
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6
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Pike SJ, Diemer V, Raftery J, Webb SJ, Clayden J. Designing foldamer-foldamer interactions in solution: the roles of helix length and terminus functionality in promoting the self-association of aminoisobutyric acid oligomers. Chemistry 2014; 20:15981-90. [PMID: 25280242 DOI: 10.1002/chem.201403626] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Indexed: 12/11/2022]
Abstract
The biological activity of antibiotic peptaibols has been linked to their ability to aggregate, but the structure-activity relationship for aggregation is not well understood. Herein, we report a systematic study of a class of synthetic helical oligomer (foldamer) composed of aminoisobutyric acid (Aib) residues, which mimic the folding behavior of peptaibols. NMR spectroscopic analysis was used to quantify the dimerization constants in solution, which showed hydrogen-bond donors at the N terminus promoted aggregation more effectively than similar modifications at the C terminus. Elongation of the peptide chain also favored aggregation. The geometry of aggregation in solution was investigated by means of titrations with [D6]DMSO and 2D NOE NMR spectroscopy, which allowed the NH protons most involved in intermolecular hydrogen bonds in solution to be identified. X-ray crystallography studies of two oligomers allowed a comparison of the inter- and intramolecular hydrogen-bonding interactions in the solid state and in solution and gave further insight into the geometry of foldamer-foldamer interactions. These solution-based and solid-state studies indicated that the preferred geometry for aggregation is through head-to-tail interactions between the N and C termini of adjacent Aib oligomers.
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Affiliation(s)
- Sarah J Pike
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL (UK), Fax: (+44) 161-275-4939
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7
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Yamaguchi H, Kodama H, Osada S, Kato F, Jelokhani-Niaraki M, Kondo M. Effect of α,α-Dialkyl Amino Acids on the Protease Resistance of Peptides. Biosci Biotechnol Biochem 2014; 67:2269-72. [PMID: 14586119 DOI: 10.1271/bbb.67.2269] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A tryptic [EC 3.4.21.4] digestion assay of 2-aminoisobutyric acid (Aib)-containing peptides was carried out to investigate the effect of alpha,alpha-dialkyl amino acid residues on the protease resistance. The introduction of Aib residues to the P1' positions exhibited a 19-fold higher protease resistance than the peptide with Aib residues introduced to the P2 position or the non-Aib peptide. The peptide having Aib residues introduced to the P1' and P2 positions resulted in complete resistance.
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Affiliation(s)
- Hiroshi Yamaguchi
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga, Japan
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8
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Ben Haj Salah K, Inguimbert N. Efficient Microwave-Assisted One Shot Synthesis of Peptaibols Using Inexpensive Coupling Reagents. Org Lett 2014; 16:1783-5. [DOI: 10.1021/ol5003253] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Khoubaib Ben Haj Salah
- Université de Perpignan Via Domitia, Centre de Recherche Insulaire
et Observatoire de l’Environnement (CRIOBE) USR CNRS 3278,
Centre de Phytopharmacie, batiment T, 58 avenue P. Alduy, 66860 Perpignan, France
| | - Nicolas Inguimbert
- Université de Perpignan Via Domitia, Centre de Recherche Insulaire
et Observatoire de l’Environnement (CRIOBE) USR CNRS 3278,
Centre de Phytopharmacie, batiment T, 58 avenue P. Alduy, 66860 Perpignan, France
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9
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Pellegrino S, Contini A, Clerici F, Gori A, Nava D, Gelmi ML. 1H-Azepine-4-amino-4-carboxylic acid: a new α,α-disubstituted ornithine analogue capable of inducing helix conformations in short Ala-Aib pentapeptides. Chemistry 2012; 18:8705-15. [PMID: 22689465 DOI: 10.1002/chem.201104023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Revised: 03/30/2012] [Indexed: 11/08/2022]
Abstract
A very efficient synthesis of orthogonally protected 1H-azepine-4-amino-4-carboxylic acid, abbreviated as Azn, a conformationally restricted analogue of ornithine, was realized. It was obtained on a gram scale in good overall yield in five steps, three of which did not require isolation of the intermediates, starting from the readily available 1-amino-4-oxo-cyclohexane-4-carboxylic acid. Both enantiomers were used for the preparation of pentapeptide models containing Ala, Aib, and Azn. Conformational studies using both spectroscopic techniques (NMR, CD) and molecular dynamics on model 5-mer peptides showed that the (R)-Azn isomer possesses a marked helicogenic effect.
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Affiliation(s)
- Sara Pellegrino
- DISMAB, Sezione di Chimica Organica A. Marchesini, Facoltà di Farmacia, Università degli Studi Milano, Via Venezian 21, 20133 Milano, Italy.
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10
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Taira J, Kida Y, Yamaguchi H, Kuwano K, Higashimoto Y, Kodama H. Modifications on amphiphilicity and cationicity of unnatural amino acid containing peptides for the improvement of antimicrobial activity against pathogenic bacteria. J Pept Sci 2011; 16:607-12. [PMID: 20648478 DOI: 10.1002/psc.1270] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The widespread natural sources-derived cationic peptides have been reported to reveal bacterial killing and/or growth-inhibiting properties. Correspondingly, a number of artificial peptides have been designed to understand antibacterial mechanism of the cationic peptides. These peptides are expected to be an alternative antibiotic against drug-resistant pathogenic bacteria because major antimicrobial mechanism of cationic peptides involves bacterial membrane disorder, although those availabilities have not been well evaluated. In this study, cationic peptides containing Aib were prepared to evaluate the availability as an antimicrobial agent, especially against representative pathogenic bacteria. Among them, BRBA20, consisting of five repeated Aib-Arg-Aib-Ala sequences, showed strong antibacterial activity against both Gram-negative and Gram-positive bacteria, including methicillin-resistant Staphylococcus aureus. Additionally, growth of Serratia marcescens and multidrug-resistant Pseudomonas aeruginosa, known as proteases-secreting pathogenic bacteria, were also completely inhibited by BRBA20 under 20 µg/ml peptide concentrations. Our results suggested availabilities of Aib-derived amphiphilicity and protease resistance in the design of artificial antimicrobial peptides. Comparing BRBA20 with BKBA20, it was also concluded that Arg residue is the preferred cationic source than Lys for antimicrobial action of amphiphilic helices.
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Affiliation(s)
- Junichi Taira
- Department of Chemistry, Kurume University School of Medicine, Kurume 830-0011, Japan
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11
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Taira J, Osada S, Hayashi R, Ueda T, Jelokhani-Niaraki M, Aoyagi H, Kodama H. Trans-Bilayer Ion Conduction by Proline Containing Cyclic Hexapeptides and Effects of Amino Acid Substitutions on Ion Conducting Properties. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20090272] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Abstract
During molecular recognition of proteins in biological systems, helices, reverse turns, and beta-sheets are dominant motifs. Often there are therapeutic reasons for blocking such recognition sites, and significant progress has been made by medicinal chemists in the design and synthesis of semirigid molecular scaffolds on which to display amino acid side chains. The basic premise is that preorganization of the competing ligand enhances the binding affinity and potential selectivity of the inhibitor. In this chapter, current progress in these efforts is reviewed.
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13
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Conformational Effects of Cyclic Hexapeptides for Ion Channel Properties. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 611:321-2. [DOI: 10.1007/978-0-387-73657-0_143] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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14
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Taira J, Osada S, Jelokhani-Niaraki M, Ehara T, Kodama H. Ion Channel Formation of Dimeric Peptide Enhanced by Electrostatic Inter-Helical Interactions. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 611:337-8. [DOI: 10.1007/978-0-387-73657-0_150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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15
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Taira J, Jelokhani-Niaraki M, Osada S, Kato F, Kodama H. Ion-Channel Formation Assisted by Electrostatic Interhelical Interactions in Covalently Dimerized Amphiphilic Helical Peptides. Biochemistry 2008; 47:3705-14. [DOI: 10.1021/bi702371e] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Junichi Taira
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan, Department of Chemistry, Faculty of Science, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada, and Department of Applied Biological Science, Faculty of Agriculture, Saga University, Saga 840-8502, Japan
| | - Masoud Jelokhani-Niaraki
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan, Department of Chemistry, Faculty of Science, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada, and Department of Applied Biological Science, Faculty of Agriculture, Saga University, Saga 840-8502, Japan
| | - Satoshi Osada
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan, Department of Chemistry, Faculty of Science, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada, and Department of Applied Biological Science, Faculty of Agriculture, Saga University, Saga 840-8502, Japan
| | - Fumio Kato
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan, Department of Chemistry, Faculty of Science, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada, and Department of Applied Biological Science, Faculty of Agriculture, Saga University, Saga 840-8502, Japan
| | - Hiroaki Kodama
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502, Japan, Department of Chemistry, Faculty of Science, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada, and Department of Applied Biological Science, Faculty of Agriculture, Saga University, Saga 840-8502, Japan
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16
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Nakatani K, Morita T, Kimura S. Vertical and directional insertion of helical peptide into lipid bilayer membrane. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:7170-7. [PMID: 17516669 DOI: 10.1021/la7002723] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A novel helical hexadecapeptide carrying a poly(ethylene glycol) (PEG) chain at the N terminal was synthesized. The N and C terminals of the compound are labeled with a fluorescein isothiocyanate (FITC) group and an N-ethylcarbazolyl group (ECz), respectively. An octapeptide carrying the same groups and a hexadecapeptide without a PEG chain were also synthesized and used as control. A mixture of the peptide and dimyristoylphosphatidylcholine was sonicated in a buffer to prepare the liposome. The orientation as well as direction of the helical segment in the lipid bilayer were analyzed by quenching experiments of the FITC and the ECz fluorescence. The results clearly indicated that the helical segment of the peptide penetrated into the lipid bilayer with vertical orientation in both the gel and liquid crystalline states of the lipid bilayer. Notably, the bulky N terminal was left behind in the outer aqueous phase of liposome, meaning that the C terminal of the peptide points to the inner aqueous phase of liposome. The insertion mode of the helical peptide into a bilayer membrane is therefore well-regulated in terms of the orientation and the directionality by designing the balance between the PEG chain and the helix length. The methodology presented here will initiate a way to construct artificial functional molecular systems that can induce vectorial transport phenomena as seen in biological systems.
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Affiliation(s)
- Koji Nakatani
- Department of Material Chemistry, Graduate School of Engineering, Kyoto University, Kyoto-Daigaku-Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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17
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Zikou S, Koukkou AI, Mastora P, Sakarellos-Daitsiotis M, Sakarellos C, Drainas C, Panou-Pomonis E. Design and synthesis of cationic Aib-containing antimicrobial peptides: conformational and biological studies. J Pept Sci 2007; 13:481-6. [PMID: 17559058 DOI: 10.1002/psc.876] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Development of antimicrobial peptides has attracted considerable attention in recent years due to the excessive use of antibiotics, which has led to multiresistant bacteria. Cationic amphiphilic Aib-containing peptide models Ac-(Aib-Arg-Aib-Leu)(n)-NH2, n = 1-4, and sequential cationic polypeptides (Arg-X-Gly)(n), X = Ala, Val, Leu, were prepared and studied for their antimicrobial and hemolytic activity, as well as for their proteolytic stability. Ac-(Aib-Arg-Aib-Leu)(n)-NH2, n = 2, 3 and the polypeptide (Arg-Leu-Gly)(n) exhibited significant antimicrobial activity, and they were nontoxic at their MIC values and resistant, in particular the Aib-peptide models, to enzymatic degradation. The conformational characteristics of the peptide models were studied by circular dichroism (CD). Structure-activity relationship studies revealed the importance of the amphipathic alpha-helical conformation of the reported peptides in inducing antimicrobial effects. It is concluded that peptide models comprising cationic amino acids (Arg), helicogenic and noncoding residues (Aib) and/or hydrophobic and helix-promoting components (Leu) may lead to the development of antimicrobial therapeutics.
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Affiliation(s)
- Sofia Zikou
- Department of Chemistry, University of Ioannina, 45110 Ioannina, Greece
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18
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Hayashi R, Osada S, Yoshiki M, Sugiyama D, Fujita I, Hamasaki Y, Kodama H. Superoxide production in human neutrophils is enhanced by treatment with transmembrane peptides derived from human formyl peptide receptor. J Biochem 2006; 139:981-8. [PMID: 16788048 DOI: 10.1093/jb/mvj117] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Formyl peptide receptor (FPR) mediates a number of important host defense functions. Although studies have been performed on the ligand binding site of FPR, FPR dynamic behavior such as receptor dimerization on the cell surface remains unknown. Recently, peptides derived from the transmembrane (TM) domains of GPCRs were shown to disrupt dimer formation by receptors and to result in specific regulation of receptor function. To reveal the function of FPR TM domains, hFPRTM peptides derived from FPR were synthesized, and their biological activities were evaluated with human neutrophils. Synthetic peptides did not exhibit agonistic or antagonistic activity toward superoxide anion production. However, Neutrophils treated with hFPRTM4 produced 4-fold superoxide anion compared with untreated cells when stimulated with FPR agonist fMLP. Short peptide fragments derived from the fourth TM region of FPR did not enhance superoxide anion production, which suggests that hFPRTM4 did not behave as a ligand. CD and fluorescence spectra suggested that hFPRTM peptides were inserted into the membrane. The addition of hFPRTM4 increased the intracellular calcium concentration, which meant the peptide activated some membrane protein on the cell surface. The present study suggests that the fourth TM domain of FPR has a function related to a priming effect.
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Affiliation(s)
- Ryo Hayashi
- Department of Chemistry, Faculty of Science and Engineering, Saga University, Saga 840-8502
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19
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Detergent-like actions of linear amphipathic cationic antimicrobial peptides. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2006; 1758:1529-39. [PMID: 16928357 DOI: 10.1016/j.bbamem.2006.07.001] [Citation(s) in RCA: 429] [Impact Index Per Article: 23.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2006] [Revised: 06/30/2006] [Accepted: 07/06/2006] [Indexed: 12/25/2022]
Abstract
Antimicrobial peptides have raised much interest as pathogens become resistant against conventional antibiotics. We review biophysical studies that have been performed to better understand the interactions of linear amphipathic cationic peptides such as magainins, cecropins, dermaseptin, delta-lysin or melittin. The amphipathic character of these peptides and their interactions with membranes resemble the properties of detergent molecules and analogies between membrane-active peptide and detergents are presented. Several models have been suggested to explain the pore-forming, membrane-lytic and antibiotic activities of these peptides. Here we suggest that these might be 'special cases' within complicated phase diagrams describing the morphological plasticity of peptide/lipid supramolecular assemblies.
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Yamaguchi H, Jelokhani-Niaraki M, Kodama H. Second transmembrane domain of human uncoupling protein 2 is essential for its anion channel formation. FEBS Lett 2004; 577:299-304. [PMID: 15527803 DOI: 10.1016/j.febslet.2004.09.070] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2004] [Revised: 09/22/2004] [Accepted: 09/24/2004] [Indexed: 10/26/2022]
Abstract
Uncoupling proteins (UCP) are known to transport anions, such as Cl-, in addition to H+ transport. Although H+ transport by UCP is clearly involved in thermogenesis, the mechanism of its anion transport is not clearly understood. In this study, we examined the anion channel characteristics of the six individual helical transmembrane (TM) domains of the human UCP2. The second TM domain peptide (TM2) forms multi-state channels by assemblies of conductive oligomers. Furthermore, the TM2 exhibited voltage-dependent anion channels with properties comparable to those of UCP1 chloride channel. However, the other five TM peptides did not form UCP1-like channels. Moreover, an analog of TM2 in which two Arg residues were substituted by Ala residues did not form stable channels, implying the significance of Arg residues for anion transport. These results suggest that the anion channel structure of UCP2 protein is oligomeric and the second TM domain is essential for the voltage-dependence of this anion channel.
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Affiliation(s)
- Hiroshi Yamaguchi
- Department of Chemistry, Faculty of Science and Engineering, Saga University, 840-8502, Japan
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21
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Tan LT, Cheng XC, Jensen PR, Fenical W. Scytalidamides A and B, new cytotoxic cyclic heptapeptides from a marine fungus of the genus Scytalidium. J Org Chem 2004; 68:8767-73. [PMID: 14604342 DOI: 10.1021/jo030191z] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two new cyclic heptapeptides have been isolated from the culture broth of a marine fungus, Scytalidium sp., collected from the Bahamas. The planar structures of scytalidamides A (1) and B (2) were assigned on the basis of 1D and 2D NMR spectroscopic techniques, while the absolute configuration of the amino acid residues in both molecules was determined by application of the advanced Marfey's method. The absolute stereochemistry of the uncommon 3-methylproline moiety in scytalidamide B (2) was confirmed by isolation and CD measurements, as well as application of the advanced Marfey's method. Scytalidamides A (1) and B (2) showed moderate in vitro cytotoxicity toward HCT-116 human colon adenocarcinoma with IC(50) values of 2.7 and 11.0 microM, respectively.
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Affiliation(s)
- Lik Tong Tan
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California-San Diego, La Jolla, CA 92093-0204, USA
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22
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Zhang Y, Futaki S, Kiwada T, Sugiura Y. Detection of protein-ligand interaction on the membranes using C-terminus biotin-tagged alamethicin. Bioorg Med Chem 2002; 10:2635-9. [PMID: 12057652 DOI: 10.1016/s0968-0896(02)00105-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
C-terminal biotin-tagged alamethicin, which has several alpha-aminoisobutyric acid (Aib) residues in its sequence, was synthesized by the preparation of the protected peptide segment using the 2-chlorotrityl resin, followed by conjugation with biotin hydrazide. Suppression of the channel current of the biotin-tagged alamethicin by the addition of streptavidin to the electrolyte was monitorable in real time using the planar lipid-bilayer method. The system was also applicable to the detection of interaction of the biotin-tagged alamethicin with the anti-biotin antibody.
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Affiliation(s)
- Y Zhang
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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23
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Yamaguchi H, Kodama H, Osada S, Jelokhani-Niaraki M, Kato F, Kondo M. The Position of Aib Residues Defines the Antimicrobial Activity of Aib-Containing Peptides. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2002. [DOI: 10.1246/bcsj.75.1563] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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Corzo G, Villegas E, Gómez-Lagunas F, Possani LD, Belokoneva OS, Nakajima T. Oxyopinins, large amphipathic peptides isolated from the venom of the wolf spider Oxyopes kitabensis with cytolytic properties and positive insecticidal cooperativity with spider neurotoxins. J Biol Chem 2002; 277:23627-37. [PMID: 11976325 DOI: 10.1074/jbc.m200511200] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Five amphipathic peptides with antimicrobial, hemolytic, and insecticidal activity were isolated from the crude venom of the wolf spider Oxyopes kitabensis. The peptides, named oxyopinins, are the largest linear cationic amphipathic peptides from the venom of a spider that have been chemically characterized at present. According to their primary structure Oxyopinin 1 is composed of 48 amino acid residues showing extended sequence similarity to the ant insecticidal peptide ponericinL2 and to the frog antimicrobial peptide dermaseptin. Oxyopinins 2a, 2b, 2c, and 2d have highly similar sequences. At least 27 out of 37 amino acid residues are conserved. They also show a segment of sequence similar to ponericinL2. Circular dichroism analyses showed that the secondary structure of the five peptides is essentially alpha-helical. Oxyopinins showed disrupting activities toward both biological membranes and artificial vesicles, particularly to those rich in phosphatidylcholine. Electrophysiological recordings performed on insect cells (Sf9) showed that the oxyopinins produce a drastic reduction of cell membrane resistance by opening non-selective ion channels. Additionally, a new paralytic neurotoxin named Oxytoxin 1 was purified from the same spider venom. It contains 69 amino acid residue cross-linked by five disulfide bridges. Application of mixtures containing oxyopinins and Oxytoxin 1 to insect larvae showed a potentiation phenomenon, by which an increase lethality effect is observed. These results suggest that the linear amphipathic peptides in spider venoms and neuropeptides cooperate to capture insects efficiently.
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Affiliation(s)
- Gerardo Corzo
- Suntory Institute for Bioorganic Research, Mishima-Gun, Shimamoto-Cho, Wakayamadai 1-1-1, Osaka 618-8503, Japan.
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25
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Landreau A, Pouchus YF, Sallenave-Namont C, Biard JF, Boumard MC, Robiou du Pont T, Mondeguer F, Goulard C, Verbist JF. Combined use of LC/MS and a biological test for rapid identification of marine mycotoxins produced by Trichoderma koningii. J Microbiol Methods 2002; 48:181-94. [PMID: 11777568 DOI: 10.1016/s0167-7012(01)00322-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Trichoderma koningii Oudemans, a strain isolated from a shellfish farming area, was selected for its high frequency in samples and its ability to produce metabolites when cultured in natural seawater. Combined use of LC/MS and a biological test on blowfly larvae allowed the characterization of four compounds after purification in only two steps (VLC and HPLC). ESI/MS, a powerful tool for rapid identification and sequence determination of peptides, confirmed that these compounds were peptide, alpha-aminoisobutyric acid and amino alcohol (peptaibols), the usual metabolites of Trichoderma.
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Affiliation(s)
- Anne Landreau
- ISOMer, SMAB-URM11 (Toxinologie marine), Faculté de Pharmacie, Université de Nantes, BP 53508, 44035 Nantes Cedex 01, France.
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26
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Futaki S, Fukuda M, Omote M, Yamauchi K, Yagami T, Niwa M, Sugiura Y. Alamethicin-leucine zipper hybrid peptide: a prototype for the design of artificial receptors and ion channels. J Am Chem Soc 2001; 123:12127-34. [PMID: 11734010 DOI: 10.1021/ja011166i] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this report, we describe a novel concept of extramembrane control of channel peptide assembly and the eventual channel current modulation. Alamethicin is a peptide antibiotic, which usually forms ion channels in various association states. By introducing an extramembrane leucine zipper segment (Alm-LeuZ), the association number of alamethicin was effectively controlled to produce a single predominant channel open state. The assembly was estimated to be a tetramer, by comparison of the channel conductance with that of the template-assembled Alm-LeuZ tetramer, which was prepared by the conjugation of a maleimide-functionalized peptide template with cysteine-derivatized Alm-LeuZ segments. Employment of an extramembrane segment of a random conformation provided higher levels of channel conductance. The result exemplified the possibility of channel current control by a conformational switch of the extramembrane segments.
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Affiliation(s)
- S Futaki
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan.
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27
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The lipid bilayer concept and its experimental realization: from soap bubbles, kitchen sink, to bilayer lipid membranes. J Memb Sci 2001. [DOI: 10.1016/s0376-7388(01)00394-5] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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28
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Ishida H, Qi Z, Sokabe M, Donowaki K, Inoue Y. Molecular design and synthesis of artificial ion channels based on cyclic peptides containing unnatural amino acids. J Org Chem 2001; 66:2978-89. [PMID: 11325262 DOI: 10.1021/jo001079t] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A series of novel cyclic peptides composed of 3 to 5 dipeptide units with alternating natural-unnatural amino acid units, have been designed and synthesized, employing 5-(N-alkanoylamino)-3-aminobenzoic acid with a long alkanoyl chain as the unnatural amino acid. All cyclic peptides with systematically varying pore size, shape, and lipophilicity are found to form ion channels with a conductance of ca. 9 pS in aqueous KCl (500 mM) upon examination by the voltage clamp method. These peptide channels are cation selective with the permeability ratio P(Cl(-))/P(K(+)) of around 0.17. The ion channels formed by the neutral, cationic, and anionic cyclic peptides containing L-alanine, L-lysine, and L-aspartate, respectively, show the monovalent cation selectivity with the permeability ratio P(Na(+))/P(K(+)) of ca. 0.39. On the basis of structural information provided by voltage-dependent blockade of the single channel current of all the tested peptides by Ca(2+), we inferred that each channel is formed from a dimer of the peptide with its peptide ring constructing the channel entrance and its alkanoyl chains lining across the membrane to build up the channel pore. The experimental results are consistent with an idea that the rate of ion conduction is determined by the nature of the hydrophobic alkanoyl chain region, which is common to all the channels.
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Affiliation(s)
- H Ishida
- Inoue Photochirogenesis Project, ERATO, Japan Science and Technology, 4-6-3 Kamishinden, Toyonaka, Osaka 560-0085, Japan.
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Futaki S, Youjun Z, Sugiura Y. Detecting a tag on a channel opening: blockage of the biotinylated channels by streptavidin. Tetrahedron Lett 2001. [DOI: 10.1016/s0040-4039(00)02287-5] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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30
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Bechinger B. The structure, dynamics and orientation of antimicrobial peptides in membranes by multidimensional solid-state NMR spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1462:157-83. [PMID: 10590307 DOI: 10.1016/s0005-2736(99)00205-9] [Citation(s) in RCA: 368] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Linear peptide antibiotics have been isolated from amphibians, insects and humans and used as templates to design cheaper and more potent analogues for medical applications. Peptides such as cecropins or magainins are < or = 40 amino acids in length. Many of them have been prepared by solid-phase peptide synthesis with isotopic labels incorporated at selected sites. Structural analysis by solid-state NMR spectroscopy and other biophysical techniques indicates that these peptide antibiotics strongly interact with lipid membranes. In bilayer environments they exhibit amphipathic alpha-helical conformations and alignments of the helix axis parallel to the membrane surface. This contrasts the transmembrane orientations observed for alamethicin or gramicidin A. Models that have been proposed to explain the antibiotic and pore-forming activities of membrane-associated peptides, as well as other experimental results, include transmembrane helical bundles, wormholes, carpets, detergent-like effects or the in-plane diffusion of peptide-induced bilayer instabilities.
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Affiliation(s)
- B Bechinger
- Max Planck Institute for Biochemistry, Am Klopferspitz 18A, 82152, Martinsried, Germany.
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