1
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Thurber KR, Yau WM, Tycko R. Structure of Amyloid Peptide Ribbons Characterized by Electron Microscopy, Atomic Force Microscopy, and Solid-State Nuclear Magnetic Resonance. J Phys Chem B 2024; 128:1711-1723. [PMID: 38348474 PMCID: PMC11423861 DOI: 10.1021/acs.jpcb.3c07867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Polypeptides often self-assemble to form amyloid fibrils, which contain cross-β structural motifs and are typically 5-15 nm in width and micrometers in length. In many cases, short segments of longer amyloid-forming protein or peptide sequences also form cross-β assemblies but with distinctive ribbon-like morphologies that are characterized by a well-defined thickness (on the order of 5 nm) in one lateral dimension and a variable width (typically 10-100 nm) in the other. Here, we use a novel combination of data from solid-state nuclear magnetic resonance (ssNMR), dark-field transmission electron microscopy (TEM), atomic force microscopy (AFM), and cryogenic electron microscopy (cryoEM) to investigate the structures within amyloid ribbons formed by residues 14-23 and residues 11-25 of the Alzheimer's disease-associated amyloid-β peptide (Aβ14-23 and Aβ11-25). The ssNMR data indicate antiparallel β-sheets with specific registries of intermolecular hydrogen bonds. Mass-per-area values are derived from dark-field TEM data. The ribbon thickness is determined from AFM images. For Aβ14-23 ribbons, averaged cryoEM images show a periodic spacing of β-sheets. The combined data support structures in which the amyloid ribbon growth direction is the direction of intermolecular hydrogen bonds between β-strands, the ribbon thickness corresponds to the width of one β-sheet (i.e., approximately the length of one molecule), and the variable ribbon width is a variable multiple of the thickness of one β-sheet (i.e., a multiple of the repeat distance in a stack of β-sheets). This architecture for a cross-β assembly may generally exist within amyloid ribbons.
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Affiliation(s)
- Kent R Thurber
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, United States
| | - Wai-Ming Yau
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, United States
| | - Robert Tycko
- Laboratory of Chemical Physics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland 20892-0520, United States
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2
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Yoshida M, Inaba T, Shibuya Y, Igarashi M, Kigoshi H. Concise Total Synthesis and Biological Evaluation of Pargamicin A and its Diastereomer, Piperazic Acid-containing Cyclopeptides. Chempluschem 2023; 88:e202300339. [PMID: 37492977 DOI: 10.1002/cplu.202300339] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2023] [Revised: 07/25/2023] [Accepted: 07/26/2023] [Indexed: 07/27/2023]
Abstract
We have accomplished the total synthesis, structure determination, and biological evaluation of pargamicin A and one of its diastereomers. Two key tripeptide segments were synthesized using a linear peptide elongation process that includes the direct coupling of a poorly nucleophilic piperazic acid derivative. The resulting tripeptides were coupled using triphosgene/collidine at ambient temperature leading to a precursor for the final cyclization step. T3P-promoted macrolactamization under high-dilution conditions, followed by the removal of the benzyl protecting group was used to furnish two putative structures of pargamicin A. Comparison of the 1 H and 13 C NMR spectra and the antibacterial activity of the natural and synthetic products successfully revealed that the absolute configuration of the N-hydroxy-Ile residue of pargamicin A is 2S,3S. A biological evaluation of synthetically obtained pargamicin A and its diastereomer suggested that the stereostructure of the cyclic peptide scaffold of the natural product plays a crucial role in determining the strength of its antibacterial activity.
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Affiliation(s)
- Masahito Yoshida
- Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan
| | - Tetsuya Inaba
- Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan
| | - Yuko Shibuya
- Institute of Microbial Chemistry (BIKAKEN), 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo, 141-0021, Japan
| | - Masayuki Igarashi
- Institute of Microbial Chemistry (BIKAKEN), 3-14-23 Kamiosaki, Shinagawa-ku, Tokyo, 141-0021, Japan
| | - Hideo Kigoshi
- Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan
- Department of Chemistry, Faculty of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan
- Alliance for Research on the Mediterranean and North Africa (ARENA), University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki, 305-8571, Japan
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3
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Fraczyk A, Janczewski L, Wasko J, Rozniakowski K, Galecki K, Kaminski ZJ, Kolesinska B. Non-Aggregating Amylin Fragments as an Inhibitors of the Aggregation Process of Susceptible to Aggregation Fragments 18-22, 23-27, and 33-37 of Hormone. Chem Biodivers 2021; 18:e2100034. [PMID: 33687147 DOI: 10.1002/cbdv.202100034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 02/18/2021] [Indexed: 11/10/2022]
Abstract
Amylin aggregation is one of the factors in the development of diabetes mellitus, which is classified as a civilization disease. The aim of this research was to find whether non-aggregating fragments 1-7, 8-12, 13-17 and 28-32 of amylin would inhibit the aggregation of the amyloidogenic cores 18-22, 23-27, 33-37 of hormone. In the study of the inhibitory potential of non-aggregating amylin fragments, a set of independent methods were used to study aggregation properties (spectroscopic and fluorescence studies with the use of indicators, microscopic studies, circular dichroism studies) and the method of prediction of aggregation properties. The performed research allowed to select the cyclic fragment (1-7) H-KCNTATC-OH with disulfide bond as an inhibitor capable of inhibiting the aggregation of all amyloidogenic cores 18-22, 23-27, 33-37 of the hormone. Additionally, it was found that this peptide inhibits insulin hot spot aggregation, which may indicate its universal utility in inhibiting the process of aggregation of hormones regulating carbohydrate metabolism directly related to the development of diabetes. Research on the possibility of the extensive use of the cyclic fragment (1-7) of H-KCNTATC-OH as a peptide inhibitor of the polypeptide/protein aggregation process is ongoing.
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Affiliation(s)
- Andrzej Fraczyk
- Institute of Applied Computer Science, Lodz University of Technology, Stefanowskiego Łódź, 18/22, 90-537, Lodz, Poland
| | - Lukasz Janczewski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924, Lodz, Poland
| | - Joanna Wasko
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924, Lodz, Poland
| | - Kamil Rozniakowski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924, Lodz, Poland
| | - Krystian Galecki
- Institute of General Food Chemistry, Faculty of Biotechnology and Food Sciences, Lodz University of Technology, Stefanowskiego 4/10, 90-924, Lodz, Poland
| | - Zbigniew J Kaminski
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924, Lodz, Poland
| | - Beata Kolesinska
- Institute of Organic Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924, Lodz, Poland
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4
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Howitz WJ, Wierzbicki M, Cabanela RW, Saliba C, Motavalli A, Tran N, Nowick JS. Interpenetrating Cubes in the X-ray Crystallographic Structure of a Peptide Derived from Medin 19-36. J Am Chem Soc 2020; 142:15870-15875. [PMID: 32816461 DOI: 10.1021/jacs.0c06143] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Amyloidogenic peptides and proteins are rich sources of supramolecular assemblies. Sequences derived from well-known amyloids, including Aβ, human islet amyloid polypeptide, and tau have been found to assemble as fibrils, nanosheets, ribbons, and nanotubes. The supramolecular assembly of medin, a 50-amino acid peptide that forms fibrillary deposits in aging human vasculature, has not been heavily investigated. In this work, we present an X-ray crystallographic structure of a cyclic β-sheet peptide derived from the 19-36 region of medin that assembles to form interpenetrating cubes. The edge of each cube is composed of a single peptide, and each vertex is occupied by a divalent metal ion. This structure may be considered a metal-organic framework (MOF) containing a large peptide ligand. This work demonstrates that peptides containing Glu or Asp that are preorganized to adopt β-hairpin structures can serve as ligands and assemble with metal ions to form MOFs.
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Affiliation(s)
- William J Howitz
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Michał Wierzbicki
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Rudy William Cabanela
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Cindy Saliba
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Ariana Motavalli
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
| | - Ngoctran Tran
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
| | - James S Nowick
- Department of Chemistry and Department of Pharmaceutical Sciences, University of California, Irvine, Irvine, California 92697-2025, United States
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5
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Eckes K, Baek K, Suggs LJ. Design and Evaluation of Short Self-Assembling Depsipeptides as Bioactive and Biodegradable Hydrogels. ACS OMEGA 2018; 3:1635-1644. [PMID: 30023812 PMCID: PMC6044717 DOI: 10.1021/acsomega.7b01641] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2017] [Accepted: 01/04/2018] [Indexed: 05/08/2023]
Abstract
Described herein is the design of a cell-adherent and degradable hydrogel. Our goal was to create a self-assembling, backbone ester-containing analogue of the cell adhesion motif, arginine-glycine-aspartic acid (RGD). Two depsipeptides containing Fmoc (N-(fluorenyl)-9-methoxycarbonyl), Fmoc-FR-Glc-D, and Fmoc-F-Glc-RGD (where "Glc" is glycolic acid) were designed based on the results of integrin-binding affinity and cell interaction analyses. Two candidate molecules were synthesized, and their gelation characteristics, degradation profiles, and ability to promote cell attachment were analyzed. We found that ester substitution within the RGD sequence significantly decreases the integrin-binding affinity and subsequent cell attachment, but when the ester moiety flanks the bioactive sequence, the molecule can maintain its integrin-binding function while permitting nonenzymatic hydrolytic degradation. A self-assembled Fmoc-F-Glc-RGD hydrogel showed steady, linear degradation over 60 days, and when mixed with Fmoc-diphenylalanine (Fmoc-FF) for improved mechanical stiffness, the depsipeptide gel exhibited improved cell attachment and viability. Though the currently designed depsipeptide has several inherent limitations, our results indicate the potential of depsipeptides as the basis for biologically functional and degradable self-assembling hydrogel materials.
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Affiliation(s)
- Kevin
M. Eckes
- Department of Biomedical
Engineering, The University of Texas at
Austin, Austin, Texas 78712, United States
| | - Kiheon Baek
- Department of Biomedical
Engineering, The University of Texas at
Austin, Austin, Texas 78712, United States
| | - Laura J. Suggs
- Department of Biomedical
Engineering, The University of Texas at
Austin, Austin, Texas 78712, United States
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6
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Obasse I, Taylor M, Fullwood NJ, Allsop D. Development of proteolytically stable N-methylated peptide inhibitors of aggregation of the amylin peptide implicated in type 2 diabetes. Interface Focus 2017; 7:20160127. [PMID: 29147551 DOI: 10.1098/rsfs.2016.0127] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Islet amyloid polypeptide, also known as amylin, is the main component of the amyloid deposits present in approximately 90% of people with type 2 diabetes mellitus (T2DM). In this disease, amylin aggregates into multimeric β-pleated sheet structures which cause damage to pancreatic islet β-cells. Inhibitors of early-stage amylin aggregation could therefore provide a disease-modifying treatment for T2DM. In this study, overlapping peptides were designed to target the 'binding' region (RLANFLVHSS, residues 11-20) of human amylin, and their effects on amyloid fibril formation were determined by thioflavin-T assay. The first generation peptides showed less than 50% inhibition of aggregation, but a second generation peptide (H2N-RGANFLVHGR-CONH2) showed strong inhibitory effects on amylin aggregation, and this was confirmed by negative stain electron microscopy. Cytotoxicity studies revealed that this peptide protected human pancreatic 1.4E7 (ECACC 10070102) insulin-secreting cells from the toxic effects of human amylin. Unlike the retro-inverso version of this peptide, which stimulated aggregation, two N-methylated peptides (H2N-RGAmNFmLVmHGR-CONH2 and H2N-RGANmFLmVHmR-CONH2) gave very clear dose-dependent inhibition of fibril formation. These two peptides were also stable against a range of different proteolytic enzymes, and in human plasma. These N-methylated peptides could provide a novel treatment for slowing progression of T2DM.
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Affiliation(s)
- Idira Obasse
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
| | - Mark Taylor
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
| | - Nigel J Fullwood
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
| | - David Allsop
- Division of Biomedical and Life Sciences, Faculty of Health and Medicine, University of Lancaster, Lancaster LA1 4YQ, UK
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7
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Hajiraissi R, Giner I, Grundmeier G, Keller A. Self-Assembly, Dynamics, and Polymorphism of hIAPP(20-29) Aggregates at Solid-Liquid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:372-381. [PMID: 27935715 DOI: 10.1021/acs.langmuir.6b03288] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The misfolding and subsequent assembly of proteins and peptides into insoluble amyloid structures play important roles in the development of numerous diseases. The dynamics of self-assembly and the morphology of the resulting aggregates critically depend on various environmental factors and especially on the presence of interfaces. Here, we show in detail how the presence of surfaces with different physicochemical properties influences the assembly dynamics and especially the aggregate morphology of hIAPP(20-29), an amyloidogenic fragment of the peptide hormone human islet amyloid polypeptide (hIAPP), which is involved in the development of type 2 diabetes. Time-lapse atomic force microscopy is employed to study the assembly dynamics of hIAPP(20-29) and the morphology of the resulting aggregates in bulk solution as well as at hydrophilic and hydrophobic model surfaces. We find that the presence of hydrophilic mica surfaces promotes fibrillation when compared with the assembly in bulk solution and results in a more pronounced polymorphism. Three fibrillar species are found to coexist on the mica surface, that is, straight, coiled, and ribbon-like fibrils, whereas only the straight and coiled fibrils are observed in bulk solution after comparable incubation times. In addition, the straight and coiled fibrils assembled at the mica surface have significantly different dimensions compared with those assembled in bulk solution. The three fibrillar species found on the mica surface most likely form independently by lateral association of arbitrary numbers of protofibrils with about 2 nm height. On hydrophobic hydrocarbon surfaces, fibrillation is retarded but not completely suppressed, in contrast to previous observations for full-length hIAPP(1-37). Our results show that peptide-surface interactions may induce diverse, peptide-specific alterations of amyloid assembly dynamics and fibrillar polymorphism. They may therefore contribute to a deeper understanding of the molecular processes that govern amyloid aggregation at different surfaces.
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Affiliation(s)
- Roozbeh Hajiraissi
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Ignacio Giner
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Guido Grundmeier
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
| | - Adrian Keller
- Technical and Macromolecular Chemistry, Paderborn University , Warburger Strasse 100, 33098 Paderborn, Germany
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8
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Han S, Lee MK, Lim YB. Cell-Penetrating Cross-β Peptide Assemblies with Controlled Biodegradable Properties. Biomacromolecules 2016; 18:27-35. [DOI: 10.1021/acs.biomac.6b01153] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sanghun Han
- Department of Materials Science
and Engineering, Yonsei University, Seoul 03722, Korea
| | - Mun-kyung Lee
- Department of Materials Science
and Engineering, Yonsei University, Seoul 03722, Korea
| | - Yong-beom Lim
- Department of Materials Science
and Engineering, Yonsei University, Seoul 03722, Korea
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9
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Ashwanikumar N, Kumar NA, Saneesh Babu PS, Sivakumar KC, Vadakkan MV, Nair P, Hema Saranya I, Asha Nair S, Vinod Kumar GS. Self-assembling peptide nanofibers containing phenylalanine for the controlled release of 5-fluorouracil. Int J Nanomedicine 2016; 11:5583-5594. [PMID: 27822037 PMCID: PMC5087806 DOI: 10.2147/ijn.s104707] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
The study shows that RADA-F6 peptide with pH-responsive self-assembling nature can be effectively used as a drug delivery system for the sustained release of a potent anticancer drug 5-fluorouracil (5-FU) at basic pH. As 5-FU contains the aromatic pyrimidine ring, RADA-F6 system is suitable for entrapping an aromatic drug due to effective π-π stacking with phenylalanine and be able to show better controlled release behavior. The stability and controlled release nature of RADA-F6 in different conditions followed by 5-FU entrapment at in silico conditions was confirmed by molecular dynamics simulation taking RADA-16 as control. Cytotoxicity of the drug-loaded RADA-F6 was measured by MTT assay and cellular uptake by confocal microscopy. Physicochemical characterization and further Western blot analysis and flow cytometric studies confirm that RADA-F6 can be successfully used as an efficient vector for pH-sensitive, controlled 5-FU delivery system.
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Affiliation(s)
| | | | | | - Krishnankutty C Sivakumar
- Distributed Information Sub-Centre (Bioinformatics Centre), Rajiv Gandhi Centre for Biotechnology, Poojappura, Thiruvananthapuram, Kerala, India
| | | | - Parvathi Nair
- Chemical Biology, Nano Drug Delivery Systems, Bio-Innovation Center
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10
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Manaviazar S, Nockemann P, Hale KJ. Total Synthesis of the GRP78-Downregulatory Macrolide (+)-Prunustatin A, the Immunosuppressant (+)-SW-163A, and a JBIR-04 Diastereoisomer That Confirms JBIR-04 Has Nonidentical Stereochemistry to (+)-Prunustatin A. Org Lett 2016; 18:2902-5. [DOI: 10.1021/acs.orglett.6b01235] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Soraya Manaviazar
- School of Chemistry & Chemical Engineering and Centre for Cancer Research and Cell Biology (CCRCB), Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Peter Nockemann
- School of Chemistry & Chemical Engineering and Centre for Cancer Research and Cell Biology (CCRCB), Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
| | - Karl J. Hale
- School of Chemistry & Chemical Engineering and Centre for Cancer Research and Cell Biology (CCRCB), Queen’s University Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, United Kingdom
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11
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Adachi H, Hirai Y, Ikeda T, Maeda M, Hori R, Kutsumizu S, Haino T. Photoresponsive Toroidal Nanostructure Formed by Self-Assembly of Azobenzene-Functionalized Tris(phenylisoxazolyl)benzene. Org Lett 2016; 18:924-7. [DOI: 10.1021/acs.orglett.5b03622] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Hiroaki Adachi
- Department
of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Yuko Hirai
- Department
of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Toshiaki Ikeda
- Department
of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
| | - Makoto Maeda
- Natural
Science Center for Basic Research and Development, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8530, Japan
| | - Ryo Hori
- Department
of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
| | - Shoichi Kutsumizu
- Department
of Chemistry and Biomolecular Science, Faculty of Engineering, Gifu University, Yanagido, Gifu 501-1193, Japan
| | - Takeharu Haino
- Department
of Chemistry, Graduate School of Science, Hiroshima University, 1-3-1 Kagamiyama, Higashi-Hiroshima 739-8526, Japan
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12
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Scaffolded multimers of hIAPP20–29 peptide fragments fibrillate faster and lead to different fibrils compared to the free hIAPP20–29 peptide fragment. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:1890-1897. [DOI: 10.1016/j.bbapap.2015.08.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2015] [Revised: 08/07/2015] [Accepted: 08/10/2015] [Indexed: 12/17/2022]
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13
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Fernández-Llamazares AI, Spengler J, Albericio F. Review backboneN-modified peptides: How to meet the challenge of secondary amine acylation. Biopolymers 2015; 104:435-52. [DOI: 10.1002/bip.22696] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Revised: 05/21/2015] [Accepted: 05/26/2015] [Indexed: 12/29/2022]
Affiliation(s)
- Ana I. Fernández-Llamazares
- Institute for Research in Biomedicine; Deparment of Chemistry and Molecular Pharmacology, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
| | - Jan Spengler
- Institute for Research in Biomedicine; Deparment of Chemistry and Molecular Pharmacology, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
| | - Fernando Albericio
- Institute for Research in Biomedicine; Deparment of Chemistry and Molecular Pharmacology, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- CIBER-BBN; Networking Centre on Bioengineering, Biomaterials and Nanomedicine, Barcelona Science Park; Baldiri Reixac 10 Barcelona 08028 Spain
- Department of Organic Chemistry; University of Barcelona; Martí i Franquès 1-11 Barcelona 08028 Spain
- School of Chemistry and Physics; University of KwaZulu-Natal; 4001 Durban South Africa
- School of Life Sciences, Department of Chemistry, Yachay Tech, Yachay City of Knowledge; Urcuquι 100119 Ecuador. Department of Chemistry; College of Science, King Saud University; P.O. Box 2455 Riyadh 11451 Saudi Arabia
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14
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Nguyen MM, Eckes KM, Suggs LJ. Charge and sequence effects on the self-assembly and subsequent hydrogelation of Fmoc-depsipeptides. SOFT MATTER 2014; 10:2693-702. [PMID: 24647784 PMCID: PMC4018732 DOI: 10.1039/c4sm00009a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Herein we report on the self-assembly of a family of Fmoc-depsipeptides into nanofibers and hydrogels. We show that fiber formation occurs in depsipeptide structures in which the fluorenyl group is closely associated and that side-chain charge and sequence affect the extent of self-assembly and subsequent gelation. Using fluorescence emission spectroscopy and circular dichroism, we show that self-assembly can be monitored and is observed in these slow-gelling systems prior to hydrogel formation. We also demonstrate that the ionic strength of salt-containing solutions affects the time at which self-assembly results in gelation of the bulk solution. From transmission electron microscopy, we report that morphological changes progress over time and are observed as micelles transitioning to fibers prior to the onset of gelation. Gelled depsipeptides degraded at a slower rate than non-gelled samples in the presence of salt, while hydrolysis in water of both gels and solution samples was minimal even after 14 days. Our work shows that while incorporating ester functionality within a peptide backbone reduces the number of hydrogen bonding sites available for forming and stabilizing supramolecular assemblies, the substitution does not prohibit self-assembly and subsequent gelation.
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Affiliation(s)
- Mary M. Nguyen
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W Dean Keeton Street, Austin, TX, 78712, USA. Fax: 512 471 0616; Tel: 512 232 8593
| | - Kevin M. Eckes
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W Dean Keeton Street, Austin, TX, 78712, USA. Fax: 512 471 0616; Tel: 512 232 8593
| | - Laura J. Suggs
- The University of Texas at Austin, Department of Biomedical Engineering, 107 W Dean Keeton Street, Austin, TX, 78712, USA. Fax: 512 471 0616; Tel: 512 232 8593
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15
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Garvey M, Meehan S, Gras SL, Schirra HJ, Craik DJ, Van der Weerden NL, Anderson MA, Gerrard JA, Carver JA. A radish seed antifungal peptide with a high amyloid fibril-forming propensity. BIOCHIMICA ET BIOPHYSICA ACTA 2013; 1834:1615-23. [PMID: 23665069 DOI: 10.1016/j.bbapap.2013.04.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 04/12/2013] [Accepted: 04/29/2013] [Indexed: 11/24/2022]
Abstract
The amyloid fibril-forming ability of two closely related antifungal and antimicrobial peptides derived from plant defensin proteins has been investigated. As assessed by sequence analysis, thioflavin T binding, transmission electron microscopy, atomic force microscopy and X-ray fiber diffraction, a 19 amino acid fragment from the C-terminal region of Raphanus sativus antifungal protein, known as RsAFP-19, is highly amyloidogenic. Further, its fibrillar morphology can be altered by externally controlled conditions. Freezing and thawing led to amyloid fibril formation which was accompanied by loss of RsAFP-19 antifungal activity. A second, closely related antifungal peptide displayed no fibril-forming capacity. It is concluded that while fibril formation is not associated with the antifungal properties of these peptides, the peptide RsAFP-19 is of potential use as a controllable, highly amyloidogenic small peptide for investigating the structure of amyloid fibrils and their mechanism of formation.
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Affiliation(s)
- Megan Garvey
- School of Chemistry and Physics, The University of Adelaide, Adelaide, Australia
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16
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Wang D, Song S, Tian Y, Xu Y, Miao Z, Zhang A. Total synthesis of the marine cyclic depsipeptide viequeamide a. JOURNAL OF NATURAL PRODUCTS 2013; 76:974-978. [PMID: 23607568 DOI: 10.1021/np4001027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The first total synthesis of viequeamide A, a natural cyclic depsipeptide isolated from a marine button cyanobacterium, was achieved with the N-Me-Val-Thr peptide bond as the final macrocyclization site. The synthetic product gave nearly identical spectroscopic data to that reported for the natural product.
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Affiliation(s)
- Dongyu Wang
- School of Pharmaceutical Engineering, Shenyang Pharmaceutical University, Shenyang, People's Republic of China
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17
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Nguyen MM, Ong N, Suggs L. A general solid phase method for the synthesis of depsipeptides. Org Biomol Chem 2013; 11:1167-70. [DOI: 10.1039/c2ob26893k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Tian YF, Hudalla GA, Han H, Collier JH. Controllably degradable β-sheet nanofibers and gels from self-assembling depsipeptides. Biomater Sci 2013; 1. [PMID: 24224082 DOI: 10.1039/c3bm60161g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembled peptide materials have received considerable interest for a range of applications, including 3D cell culture, tissue engineering, and the delivery of cells and drugs. One challenge in applying such materials within these areas has been the extreme stability of β-sheet fibrillized peptides, which are resistant to proteolysis, degradation, and turnover in biological environments. In this study, we designed self-assembling depsipeptides containing ester bonds within the peptide backbone. Beta-sheet fibrillized nanofibers were formed in physiologic conditions, and two of these nanofiber-forming depsipeptides produced hydrogels that degraded controllably over the course of days-to-weeks via ester hydrolysis. With HPLC, TEM, and oscillating rheometry, we show that the rate of hydrolysis can be controlled in a straightforward manner by specifying the amino acid residues surrounding the ester bond. In 3D cell cultures, depsipeptide gels softened over the course of several days and permitted considerably more proliferation and spreading of C3H10T1/2 pluripotent stem cells than non-degradable analogs. This approach now provides a reliable and reproducible means to soften or clear β-sheet fibrillized peptide materials from biological environments.
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Affiliation(s)
- Ye F Tian
- Department of Surgery, Biological Science Division, University of Chicago, Chicago, Illinois, United States ; Department of Biomedical Engineering, Illinois Institute of Technology, Chicago, Illinois, United States
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19
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Abstract
For many years, peptides have been known to self-assemble to form nano- and micro-scale structures. Their nature of assembly and assembled morphology has since been investigated as this area of research has important implications for the development of both drug delivery and tissue regeneration. In this article, we explore the process of peptide self-assembly in vivo, and experiments that exploit the structures formed. Particular focus is directed towards diphenylalanine, the simplest self-assembling peptide, which generally forms tube-like structures on assembly. In addition, different peptides that may assemble into a range of other morphologies are highlighted and potential applications in regenerative medicine and drug delivery discussed.
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20
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Feldborg LN, Saletra WJ, Iavicoli P, Amabilino DB. Central metal ion determined self-assembly of intrinsically chiral porphyrins. J PORPHYR PHTHALOCYA 2012. [DOI: 10.1142/s108842461100394x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aggregation of a tetraaryl-porphyrin with chiral amide-containing side groups depends critically on the central metal ion in the tetrapyrrolic core, an effect shown dramatically in solution as well as in the gel formation by the compounds. In solution, the circular dichroism (CD) spectra of the metalloporphyrins show that they all aggregate to some degree, and in most cases the aggregates of the metal-containing species is more favored than the parent free-base porphyrin. The compound which shows the greatest optical activity is the zinc(II) porphyrin which forms a J-aggregate with large Cotton effects in the CD spectrum. Infrared spectroscopy revealed that this aggregate is favored by interaction of the amide oxygen atom with the zinc(II) ion at the core of the porphyrin. The other metalloporphyrins, containing divalent copper, cobalt, and palladium or manganese(III) acetate all show CD activity, and all but the cobalt compound form gels in hexane or cyclohexane. The morphology of the xerogels formed after evaporation of the solvent from these gels depend greatly on the metal ion, with only the copper porphyrin — which shows a clear H-aggregate in solution — having a fibrous morphology
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Affiliation(s)
- Lise N. Feldborg
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, 08193, Cerdanyola del Vallès, Catalonia, Spain
| | - Wojciech J. Saletra
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, 08193, Cerdanyola del Vallès, Catalonia, Spain
| | - Patrizia Iavicoli
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, 08193, Cerdanyola del Vallès, Catalonia, Spain
| | - David B. Amabilino
- Institut de Ciència de Materials de Barcelona (ICMAB-CSIC), Campus Universitari de Bellaterra, 08193, Cerdanyola del Vallès, Catalonia, Spain
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21
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Andreasen M, Nielsen SB, Mittag T, Bjerring M, Nielsen JT, Zhang S, Nielsen EH, Jeppesen M, Christiansen G, Besenbacher F, Dong M, Nielsen NC, Skrydstrup T, Otzen DE. Modulation of fibrillation of hIAPP core fragments by chemical modification of the peptide backbone. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2012; 1824:274-85. [DOI: 10.1016/j.bbapap.2011.10.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2011] [Revised: 10/14/2011] [Accepted: 10/24/2011] [Indexed: 11/30/2022]
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22
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Wang D, Jia X, Zhang A. Total synthesis of the proposed structure of cyclic hexadepsipeptide veraguamide A. Org Biomol Chem 2012; 10:7027-30. [DOI: 10.1039/c2ob26002f] [Citation(s) in RCA: 8] [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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23
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Yang G, Wong MK, Lin LE, Yip CM. Nucleation and growth of elastin-like peptide fibril multilayers: an in situ atomic force microscopy study. NANOTECHNOLOGY 2011; 22:494018. [PMID: 22101911 DOI: 10.1088/0957-4484/22/49/494018] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Controlling how molecules assemble into complex supramolecular architectures requires careful consideration of the subtle inter- and intra-molecular interactions that control their association. This is particularly crucial in the context of assembly at interfaces, where both surface chemistry and structure can play a role in directing structure formation. We report here the results of a study into the self-assembly of the elastin-like peptide EP I on structurally modified highly ordered pyrolytic graphite, including the role of spatial confinement on fibril nucleation and the growth of oriented fibril multilayers. In situ atomic force microscopy performed in fluid and at elevated temperature provided direct evidence of frustrated fibril nuclei and oriented growth of independent fibril domains. These results portend the application of this in situ strategy for studies of the nucleation and growth mechanisms of other fibril- and amyloid-forming proteins.
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Affiliation(s)
- Guocheng Yang
- Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, M5S 3G9, Canada
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24
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Liskamp RMJ, Rijkers DTS, Kruijtzer JAW, Kemmink J. Peptides and proteins as a continuing exciting source of inspiration for peptidomimetics. Chembiochem 2011; 12:1626-53. [PMID: 21751324 DOI: 10.1002/cbic.201000717] [Citation(s) in RCA: 131] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Indexed: 12/17/2022]
Abstract
Despite their enormous diversity in biological function and structure, peptides and proteins are endowed with properties that have induced and stimulated the development of peptidomimetics. Clearly, peptides can be considered as the "stem" of a phylogenetic molecular development tree from which branches of oligomeric peptidomimetics such as peptoids, peptidosulfonamides, urea peptidomimetics, as well as β-peptides have sprouted. It is still a challenge to efficiently synthesize these oligomeric species, and study their structural and biological properties. Combining peptides and peptidomimetics led to the emergence of peptide-peptidomimetic hybrids in which one or more (proteinogenic) amino acid residues have been replaced with these mimetic residues. In scan-like approaches, the influence of these replacements on biological activity can then be studied, to evaluate to what extent a peptide can be transformed into a peptidomimetic structure while maintaining, or even improving, its biological properties. A central issue, especially with the smaller peptides, is the lack of secondary structure. Important approaches to control secondary structure include the introduction of α,α-disubstituted amino acids, or (di)peptidomimetic structures such as the Freidinger lactam. Apart from intra-amino acid constraints, inter-amino acid constraints for formation of a diversity of cyclic peptides have shaped a thick branch. Apart from the classical disulfide bridges, the repertoire has been extended to include sulfide and triazole bridges as well as the single-, double- and even triple-bond replacements, accessible by the extremely versatile ring-closing alkene/alkyne metathesis approaches. The latter approach is now the method of choice for the secondary structure that presents the greatest challenge for structural stabilization: the α-helix.
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Affiliation(s)
- Rob M J Liskamp
- Medicinal Chemistry and Chemical Biology, Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, P.O. Box 80082, 3508 TB Utrecht, The Netherlands.
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25
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Buch I, Tsai CJ, Wolfson HJ, Nussinov R. Symmetry-based self-assembled nanotubes constructed using native protein structures: the key role of flexible linkers. Protein Pept Lett 2011; 18:362-72. [PMID: 21222638 PMCID: PMC7316382 DOI: 10.2174/092986611794653996] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Accepted: 12/15/2010] [Indexed: 11/22/2022]
Abstract
We construct nanotubes using native protein structures and their native associations from structural databases. The construction is based on a shape-guided symmetric self-assembly concept. Our strategy involves fusing judiciously-selected oligomerization domains via peptide linkers. Linkers are inherently flexible, hence their choice is critical: they should position the domains in three-dimensional space in the desired orientation while retaining their own natural conformational tendencies; however, at the same time, retain the construct stability. Here we outline a design scheme which accounts for linker flexibility considerations, and present two examples. The first is HIV-1 capsid protein, which in vitro self-assembles into nanotubes and conical capsids, and its linker exists as a short flexible loop. The second involves novel nanotubes construction based on antimicrobial homodimer Magainin 2, employing linkers of distinct lengths and flexibility levels. Our strategy utilizes the abundance of unique shapes and sizes of proteins and their building blocks which can assemble into a vast number of combinations, and consequently, nanotubes of distinct morphologies and diameters. Computational design and assessment methodologies can help reduce the number of candidates for experimental validation. This is an invited paper for a special issue on protein dynamics, here focusing on flexibility in nanotube design based on protein building blocks.
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Affiliation(s)
- Idit Buch
- Department of Human Genetics, Sackler Institute of Molecular Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
| | - Chung-Jung Tsai
- SAIC-Frederick, Inc., Center for Cancer Research Nanobiology Program, NCI – Frederick, Bldg 469, Frederick, MD 21702, USA
| | - Haim J. Wolfson
- School of Computer Science, Tel Aviv University, Tel Aviv 69978, Israel
| | - Ruth Nussinov
- Department of Human Genetics, Sackler Institute of Molecular Medicine, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
- SAIC-Frederick, Inc., Center for Cancer Research Nanobiology Program, NCI – Frederick, Bldg 469, Frederick, MD 21702, USA
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26
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Zhu X, Li Y, Duan P, Liu M. Self-Assembled Ultralong Chiral Nanotubes and Tuning of Their Chirality Through the Mixing of Enantiomeric Components. Chemistry 2010; 16:8034-40. [DOI: 10.1002/chem.201000595] [Citation(s) in RCA: 99] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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27
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Nanofibrous scaffold from self-assembly of β-sheet peptides containing phenylalanine for controlled release. J Control Release 2010; 142:354-60. [DOI: 10.1016/j.jconrel.2009.11.016] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2009] [Revised: 10/27/2009] [Accepted: 11/15/2009] [Indexed: 12/11/2022]
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28
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pH Controlled Aggregation Morphology of Aβ(16–22): Formation of Peptide Nanotubes, Helical Tapes and Amyloid Fibrils. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009. [DOI: 10.1007/978-0-387-73657-0_109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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29
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Iqbal S, Miravet JF, Escuder B. Biomimetic Self-Assembly of Tetrapeptides into Fibrillar Networks and Organogels. European J Org Chem 2008. [DOI: 10.1002/ejoc.200800547] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Mirror image supramolecular helical tapes formed by the enantiomeric-depsipeptide derivatives of the amyloidogenic peptide amylin(20–29). Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.12.021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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31
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Nagarkar RP, Schneider JP. Synthesis and primary characterization of self-assembled peptide-based hydrogels. Methods Mol Biol 2008; 474:61-77. [PMID: 19031061 PMCID: PMC2650242 DOI: 10.1007/978-1-59745-480-3_5] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
Abstract
Hydrogels based on peptide self-assembly form an important class of biomaterials that find application in tissue engineering and drug delivery. It is essential to prepare peptides with high purity to achieve batch-to-batch consistency affording hydrogels with reproducible properties. Automated solid-phase peptide synthesis coupled with optimized Fmoc (9-fluorenylmethoxy-carbonyl) chemistry to obtain peptides in high yield and purity is discussed. Details of isolating a desired peptide from crude synthetic mixtures and assessment of the peptide's final purity by high-performance liquid chromatography and mass spectrometry are provided. Beyond the practical importance of synthesis and primary characterization, techniques used to investigate the properties of hydrogels are briefly discussed.
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Affiliation(s)
- Radhika P Nagarkar
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA
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32
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Delayed fibril formation of amylin(20–29) by incorporation of alkene dipeptidosulfonamide isosteres obtained by solid phase olefin cross metathesis. Bioorg Med Chem Lett 2008; 18:78-84. [DOI: 10.1016/j.bmcl.2007.11.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2007] [Revised: 11/01/2007] [Accepted: 11/02/2007] [Indexed: 11/17/2022]
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33
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Elgersma RC, Mulder GE, Kruijtzer JAW, Posthuma G, Rijkers DTS, Liskamp RMJ. Transformation of the amyloidogenic peptide amylin(20–29) into its corresponding peptoid and retropeptoid: Access to both an amyloid inhibitor and template for self-assembled supramolecular tapes. Bioorg Med Chem Lett 2007; 17:1837-42. [PMID: 17276062 DOI: 10.1016/j.bmcl.2007.01.042] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2006] [Revised: 01/12/2007] [Accepted: 01/13/2007] [Indexed: 10/23/2022]
Abstract
The highly amyloidogenic peptide sequence of amylin(20-29) was transformed into its corresponding peptoid and retropeptoid sequences to design a novel class of beta-sheet breaker peptides as amyloid inhibitors. This report describes the synthesis of the chiral peptoid building block of L-isoleucine, the solid phase synthesis of the peptoid and retropeptoid sequences of amylin(20-29), and the structural analysis of these amylin derivatives in solution by infrared spectroscopy, circular dichroism, and transmission electron microscopy. It was found that the peptoid sequence did not form amyloid fibrils or any other secondary structures and was able to inhibit amyloid formation of native amylin(20-29). Although the retropeptoid did not form amyloid fibrils it had only modest amyloid inhibitor properties since supramolecular tapes were formed.
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Affiliation(s)
- Ronald C Elgersma
- Department of Medicinal Chemistry & Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, PO Box 80082, 3508 TB Utrecht, The Netherlands
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34
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Elgersma RC, Posthuma G, Rijkers DTS, Liskamp RMJ. Backbone-modified amylin derivatives: implications for amyloid inhibitor design and as template for self-assembling bionanomaterials. J Pept Sci 2007; 13:709-16. [PMID: 17890652 DOI: 10.1002/psc.831] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This report reviews our approach to the design, synthesis and structural/morphological analysis of backbone-modified amylin(20-29) derivatives. Depending on the position in the peptide backbone and the type of amide bond isostere/modification, the amylin(20-29) peptides behave either as inhibitors of amyloid fibril formation, which are able to retard amyloid formation of native amylin(20-29), or as templates for the formation of self-assembled supramolecular structures. Molecular fine-tuning of the hydrogen-bond accepting/donating properties allows the control over the morphology of the supramolecular aggregation motifs such as helical ribbons and tapes, ribbons progressing to closed peptide nanotubes, (twisted) lamellar sheets or amyloid fibrils.
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Affiliation(s)
- Ronald C Elgersma
- Department of Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, The Netherlands
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35
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Elgersma RC, Meijneke T, de Jong R, Brouwer AJ, Posthuma G, Rijkers DTS, Liskamp RMJ. Synthesis and structural investigations of N-alkylated β-peptidosulfonamide–peptide hybrids of the amyloidogenic amylin(20–29) sequence: implications of supramolecular folding for the design of peptide-based bionanomaterials. Org Biomol Chem 2006; 4:3587-97. [PMID: 16990934 DOI: 10.1039/b606875h] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The incorporation of a single beta-aminoethane sulfonyl amide moiety in a highly amyloidogenic peptide sequence resulted in a complete loss of amyloid fibril formation. Instead, supramolecular folding morphologies were observed. Subsequent chemoselective N-alkylation of the sulfonamide resulted in amphiphilic peptide-based hydrogelators. It was found that variation of merely the alkyl chain induced a dramatic variation in aggregation motifs such as helical ribbons and tapes, ribbons progressing to closed tubes, twisted lamellar sheets and entangled/branched fibers.
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Affiliation(s)
- Ronald C Elgersma
- Department of Medicinal Chemistry and Chemical Biology, Utrecht Institute for Pharmaceutical Sciences, Utrecht University, PO Box 80082, 3508 TB, Utrecht, The Netherlands
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