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West NG, Bamford SE, Pigram PJ, Pan J, Qi DC, Mechler A. Controllable hierarchical self-assembly: systematic study forming metallosupramolecular frameworks on the basis of helical beta-oligoamides. MATERIALS HORIZONS 2023; 10:5584-5596. [PMID: 37815516 DOI: 10.1039/d3mh01327h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/11/2023]
Abstract
Self-assembly is a key guiding principle for the design of complex nanostructures. Substituted beta oligoamides offer versatile building blocks that can have inherent folding characteristics, offering geometrically defined functionalities that can specifically bind and assemble with predefined morphological characteristics. In this work hierarchical self-assembly is implemented based on metal coordinating helical beta-oligoamides crosslinked with transition metals selected for their favourable coordination geometries, Fe2+, Cu2+, Ni2+, Co2+, Zn2+, and two metalates, MoO42-, and WO42-. The oligoamide Ac-β3Aβ3Vβ3S-αHαHαH-β3Aβ3Vβ3A (3H) was designed to allow crosslinking via three distinct faces of the helical unit, with a possibility of forming three dimensional framework structures. Atomic force microscopy (AFM) confirmed the formation of specific morphologies that differ characteristically with each metal. X-Ray photoelectron spectroscopy (XPS) results reveal that the metal centres can be reduced in the final structures, confirming strong chemical interaction. Time of flight secondary ion mass spectrometry (ToF-SIMS) confirmed the spatial distribution of metals within the self-assembled networks, also revealing molecular fragments that confirm coordination to histidine and carboxyl moieties. The metalates MoO42- and WO42- were also able to induce the formation of specific superstructure morphologies. It was observed that assembly with either of nickel, copper, and molybdate form thin films, while cobalt, zinc, and tungstate produced specific three dimensional networks of oligoamides. Iron was found to form both a thin film and a complex hierarchical assembly with the 3H simultaneously. The design of the 3H substituted beta oligoamide to readily form metallosupramolecular frameworks was demonstrated with a range of metals and metalates with a degree of control over layer thicknesses as a function of the metal/metalate. The results validate and broaden the metallosupramolecular framework concept and establish a platform technology for the design of functional thin layer materials.
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Affiliation(s)
- Norton G West
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia.
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Sarah E Bamford
- Center for Materials and Surface Science, and Department of Mathematical and Physical Sciences, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Paul J Pigram
- Center for Materials and Surface Science, and Department of Mathematical and Physical Sciences, La Trobe University, Melbourne, VIC, 3086, Australia
| | - Jisheng Pan
- Institute of Materials Research and Engineering (IMRE), Agency for Science, Technology and Research (A*STAR), 2 Fusionopolis Way, Innovis #08-03, Singapore 138634, Republic of Singapore.
| | - Dong-Chen Qi
- School of Chemistry and Physics, Queensland University of Technology, Brisbane, Queensland, 4001, Australia
| | - Adam Mechler
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, VIC, 3086, Australia.
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Algar JL, Findlay JA, Preston D. Roles of Metal Ions in Foldamers and Other Conformationally Flexible Supramolecular Systems. ACS ORGANIC & INORGANIC AU 2022; 2:464-476. [PMID: 36855532 PMCID: PMC9955367 DOI: 10.1021/acsorginorgau.2c00021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 08/04/2022] [Accepted: 08/08/2022] [Indexed: 11/28/2022]
Abstract
Conformational control is a key prerequisite for much molecular function. As chemists seek to create complex molecules that have applications beyond the academic laboratory, correct spatial positioning is critical. This is particularly true of flexible systems. Conformationally flexible molecules show potential because they resemble in many cases naturally occurring analogues such as the secondary structures found in proteins and peptides such as α-helices and β-sheets. One of the ways in which conformation can be controlled in these molecules is through interaction with or coordination to metal ions. This review explores how secondary structure (i.e., controlled local conformation) in foldamers and other conformationally flexible systems can be enforced or modified through coordination to metal ions. We hope to provide examples that illustrate the power of metal ions to influence this structure toward multiple different outcomes.
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Boruah A, Roy A. Advances in hybrid peptide-based self-assembly systems and their applications. Biomater Sci 2022; 10:4694-4723. [PMID: 35899853 DOI: 10.1039/d2bm00775d] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Self-assembly of peptides demonstrates a great potential for designing highly ordered, finely tailored supramolecular arrangements enriched with high specificity, improved efficacy and biological activity. Along with natural peptides, hybrid peptide systems composed of natural and chemically diverse unnatural amino acids have been used in various fields, including drug delivery, wound healing, potent inhibition of diseases, and prevention of biomaterial related diseases to name a few. In this review, we provide a brief outline of various methods that have been utilized for obtaining fascinating structures that create an avenue to reproduce a range of functions resulting from these folds. An overview of different self-assembled structures as well as their applications will also be provided. We believe that this review is very relevant to the current scenario and will cover conformations of hybrid peptides and resulting self-assemblies from the late 20th century through 2022. This review aims to be a comprehensive and reliable account of the hybrid peptide-based self-assembly owing to its enormous influence in understanding and mimicking biological processes.
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Affiliation(s)
- Alpana Boruah
- Applied Organic Chemistry Group, Chemical Sciences and Technology Division, Council of Scientific and Industrial Research-North East Institute of Science and Technology (CSIR-NEIST), Pulibor, Jorhat-785006, Assam, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Arup Roy
- Applied Organic Chemistry Group, Chemical Sciences and Technology Division, Council of Scientific and Industrial Research-North East Institute of Science and Technology (CSIR-NEIST), Pulibor, Jorhat-785006, Assam, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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Buchanan C, Hinds MG, Puskar L, Garvey CJ, Mechler A. Comprehensive multidimensional study of the self-assembly properties of a three residue substituted β3 oligoamide. PURE APPL CHEM 2021. [DOI: 10.1515/pac-2021-0324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
Substituted β3 oligoamides form a unique self-assembling system where each monomer folds into a helix containing approximately three β3 amino acids per turn, yielding a geometrically well-defined cylindrical building block that, when N-acylated, is able to self-assemble head-to-tail into nanorods that can reach several 100 μm length. It was shown in previous works that self-assembly can be achieved with a three residue long oligoamide as well that lacks any intramolecular H-bonds, yet it crystallizes in a helix-like conformation. The self-assembly properties of these small oligoamides are however elusive, suggesting a more complex system than the self-assembly of the H-bond stabilized helical monomers. Here we focus on the self-assembly behaviour of a three residue oligoamide, Ac-β3[LIA] where the letters denote the side chain of the analogous α amino acid. Ac-β3[LIA] can yield highly inhomogeneous suspensions in water with a broad range of large fibrous structures that seem to be very stable, yet occasionally fibre growth is only observed upon heating. The small size of the monomer suggests a highly dynamic equilibrium yet all previous attempts failed to clearly identify low molecular weight species. Therefore a special methodology was employed in this study to characterize the suspensions at different size ranges: SANS that is optimal to measure the small oligomers and cross sectional diameter of the assemblies, DLS that is sensitive to the large populations and therefore the length of the superstructures, and NMR that is sensitive to monomeric and small oligomeric form, in conjunction with IR spectroscopy to probe the folding and AFM to image the morphology of the assemblies. Temperature ramping was used to perturb the system to probe the dynamicity of the self-assembly. It was found that the anomalous self-assembly behaviour of Ac-β3[LIA] is caused by its two stable conformations, a helix-building “horseshoe” fold and a linear conformer. The latter is exclusively found in monomeric form in solution whereas the horseshoe fold is stable in solid phase and in fibrous assemblies. Small oligomers were absent. Thus the self-assembly of Ac-β3[LIA] is arrested by the activation energy need of the conformation change; fibre growth might be triggered by conditions that allow increased conformational freedom of the monomers. This observation may be used to develop strategies for controlled switchable self-assembly.
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Affiliation(s)
- Claire Buchanan
- Department of Chemistry and Physics , Latrobe University , Bundoora , Australia
| | - Mark G. Hinds
- Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne , Parkville , Australia
| | - Ljiljana Puskar
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH , Berlin , Germany
| | - Christopher J. Garvey
- Lund Institute for Advanced Neutron and X-Ray Science , 223 70 Lund , Sweden
- Biofilm-Research Center for Biointerfaces and Biomedical Science Department , Faculty of Health and Society, Malmo University , 211 19 Malmo , Sweden
| | - Adam Mechler
- Department of Chemistry and Physics , Latrobe University , Bundoora , Australia
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Arumugaperumal R, Shellaiah M, Srinivasadesikan V, Awasthi K, Sun KW, Lin MC, Ohta N, Chung WS. Diversiform Nanostructures Constructed from Tetraphenylethene and Pyrene-Based Acid/Base Controllable Molecular Switching Amphiphilic [2]Rotaxanes with Tunable Aggregation-Induced Static Excimers. ACS APPLIED MATERIALS & INTERFACES 2020; 12:45222-45234. [PMID: 32985177 DOI: 10.1021/acsami.0c14107] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Dual-emissive tetraphenylethene (TPE) and pyrene-containing amphiphilic molecules are of great interest because they can be integrated to form stimuli responsive materials with various biological applications. Herein, we report the study of mechanically interlocked molecules (MIMs) with aggregation-induced static excimer emission (AISEE) property through a series of TPE and pyrene-based amphiphilic [2]rotaxanes, where t-butylcalix[4]arene with hydrophobic nature was used as the macrocycle. Evidently, by adorning TPE and pyrene units in [2]rotaxanes P1, P2, P1-b, and P2-b, they display remarkable emission bands in 70% of water fraction (fw) in tetrahydrofuran (THF)/water mixture, which could be attributed to the restricted intramolecular rotation of phenyl groups, whereas prominent blue-shifted excimer emission of pyrene started to appear as fw reached 80% for P1 and 90% for P1-b, P2, and P2-b, which was ascribed to the favorable π-π stacking and hydrophobic interactions of the pyrene rings that enabled their static excimer formation. The well-defined distinct amphiphilic nanostructures of [2]rotaxanes including hollowspheres, mesoporous nanostructures, spheres, and network linkages can be driven smoothly depending on the molecular structures and their aggregated states in THF/water mixture. These fascinating diversiform nanostructures were mainly controlled by the skillful manner of reversible molecular shuttling of t-butylcalix[4]arene macrocycle and also the interplay of multinoncovalent interactions. To further understand the aggregation capabilities of [2]rotaxanes, the human lung fibroblasts (MRC-5) living cell incubated with either P1, P2, P1-b, or P2-b was studied and monitored by confocal laser scanning microscopy. The AISEE property was achieved at an astonishing level by integrating TPE and pyrene to MIM-based reversible molecular switching [2]rotaxanes; furthermore, distinct nanostructures, especially hollowspheres and mesoporous nanostructures, were observed, which are rarely reported in the literature but are highly desirable for future applications.
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Affiliation(s)
- Reguram Arumugaperumal
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
| | - Muthaiah Shellaiah
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
| | - Venkatesan Srinivasadesikan
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
- Division Chemistry, Department of Sciences and Humanities, Vignan's Foundation for Science, Technology and Research, Vadlamudi, Guntur 522 213, Andhra Pradesh, India
| | - Kamlesh Awasthi
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
- Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
| | - Kien Wen Sun
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
| | - Ming-Chang Lin
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
| | - Nobuhiro Ohta
- Department of Applied Chemistry and Institute of Molecular Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
- Center for Emergent Functional Matter Science, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
| | - Wen-Sheng Chung
- Department of Applied Chemistry, National Chiao Tung University, Hsinchu 300, Taiwan, ROC
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Rinaldi S. The Diverse World of Foldamers: Endless Possibilities of Self-Assembly. Molecules 2020; 25:E3276. [PMID: 32708440 PMCID: PMC7397133 DOI: 10.3390/molecules25143276] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2020] [Revised: 07/13/2020] [Accepted: 07/16/2020] [Indexed: 02/07/2023] Open
Abstract
Different classes of foldamers, which are synthetic oligomers that adopt well-defined conformations in solution, have been the subject of extensive studies devoted to the elucidation of the forces driving their secondary structures and their potential as bioactive molecules. Regardless of the backbone type (peptidic or abiotic), the most important features of foldamers are the high stability, easy predictability and tunability of their folding, as well as the possibility to endow them with enhanced biological functions, with respect to their natural counterparts, by the correct choice of monomers. Foldamers have also recently started playing a starring role in the self-assembly of higher-order structures. In this review, selected articles will be analyzed to show the striking number of self-assemblies obtained for foldamers with different backbones, which will be analyzed in order of increasing complexity. Starting from the simplest self-associations in solution (e.g., dimers of β-strands or helices, bundles, interpenetrating double and multiple helices), the formation of monolayers, vesicles, fibers, and eventually nanostructured solid tridimensional morphologies will be subsequently described. The experimental techniques used in the structural investigation, and in the determination of the driving forces and mechanisms underlying the self-assemblies, will be systematically reported. Where applicable, examples of biomimetic self-assembled foldamers and their interactions with biological components will be described.
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Affiliation(s)
- Samuele Rinaldi
- Department of Life and Environmental Sciences, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy
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Buchanan C, Garvey CJ, Puskar L, Perlmutter P, Mechler A. Coordination crosslinking of helical substituted oligoamide nanorods with Cu(II). Supramol Chem 2020. [DOI: 10.1080/10610278.2020.1730839] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Claire Buchanan
- Department of Chemistry and Physics, La Trobe University, Bundoora, Australia
| | - Christopher J Garvey
- Australian Nuclear Science and Technology Organization (ANSTO), Lucas Heights, Australia
- Lund Institute for Advanced Neutron and X-ray Science (LINXS), Lund, Sweden
- Biofilms Research Center for Biointerfaces, Department of Biomedical Science, Health and Society, Malmö University, Malmö, Sweden
| | - Ljiljana Puskar
- Helmholtz Zentrum Berlin für Materialien und Energie GmbH, Berlin, Germany
| | - Patrick Perlmutter
- Department of Chemistry and Physics, La Trobe University, Bundoora, Australia
| | - Adam Mechler
- Department of Chemistry and Physics, La Trobe University, Bundoora, Australia
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8
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Han S, Mellot G, Pensec S, Rieger J, Stoffelbach F, Nicol E, Colombani O, Jestin J, Bouteiller L. Crucial Role of the Spacer in Tuning the Length of Self-Assembled Nanorods. Macromolecules 2020. [DOI: 10.1021/acs.macromol.9b01928] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuaiyuan Han
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, UMR 8232, Equipe Chimie des Polymères, 75252 Paris, France
| | - Gaëlle Mellot
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, UMR 8232, Equipe Chimie des Polymères, 75252 Paris, France
| | - Sandrine Pensec
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, UMR 8232, Equipe Chimie des Polymères, 75252 Paris, France
| | - Jutta Rieger
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, UMR 8232, Equipe Chimie des Polymères, 75252 Paris, France
| | - François Stoffelbach
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, UMR 8232, Equipe Chimie des Polymères, 75252 Paris, France
| | - Erwan Nicol
- Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
| | - Olivier Colombani
- Institut des Molécules et Matériaux du Mans (IMMM), UMR 6283 CNRS Le Mans Université, Avenue Olivier Messiaen, 72085 Le Mans Cedex 9, France
| | - Jacques Jestin
- Laboratoire Léon Brillouin, UMR12 CEA-CNRS, Bât. 563, CEA Saclay, 91191 Gif-sur-Yvette, France
| | - Laurent Bouteiller
- Institut Parisien de Chimie Moléculaire, Sorbonne Université, CNRS, UMR 8232, Equipe Chimie des Polymères, 75252 Paris, France
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Kulkarni K, Habila N, Del Borgo MP, Aguilar MI. Novel Materials From the Supramolecular Self-Assembly of Short Helical β 3-Peptide Foldamers. Front Chem 2019; 7:70. [PMID: 30828574 PMCID: PMC6384263 DOI: 10.3389/fchem.2019.00070] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Accepted: 01/25/2019] [Indexed: 11/13/2022] Open
Abstract
Self-assembly is the spontaneous organization of small components into higher-order structures facilitated by the collective balance of non-covalent interactions. Peptide-based self-assembly systems exploit the ability of peptides to adopt distinct secondary structures and have been used to produce a range of well-defined nanostructures, such as nanotubes, nanofibres, nanoribbons, nanospheres, nanotapes, and nanorods. While most of these systems involve self-assembly of α-peptides, more recently β-peptides have also been reported to undergo supramolecular self-assembly, and have been used to produce materials-such as hydrogels-that are tailored for applications in tissue engineering, cell culture and drug delivery. This review provides an overview of self-assembled peptide nanostructures obtained via the supramolecular self-assembly of short β-peptide foldamers with a specific focus on N-acetyl-β3-peptides and their applications as bio- and nanomaterials.
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Affiliation(s)
| | | | - Mark P. Del Borgo
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute, Monash Univdersity, Melbourne, VIC, Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute, Monash Univdersity, Melbourne, VIC, Australia
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Christofferson AJ, Al-Garawi ZS, Todorova N, Turner J, Del Borgo MP, Serpell LC, Aguilar MI, Yarovsky I. Identifying the Coiled-Coil Triple Helix Structure of β-Peptide Nanofibers at Atomic Resolution. ACS NANO 2018; 12:9101-9109. [PMID: 30157375 DOI: 10.1021/acsnano.8b03131] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Peptide self-assembly represents a powerful bottom-up approach to the fabrication of nanomaterials. β3-Peptides are non-natural peptides composed entirely of β-amino acids, which have an extra methylene in the backbone, and we reported fibers derived from the self-assembly of β3-peptides that adopt 14-helical structures. β3-Peptide assemblies represent a class of stable nanomaterials that can be used to generate bio- and magneto-responsive materials with proteolytic stability. However, the three-dimensional structure of many of these materials remains unknown. To develop structure-based criteria for the design of β3-peptide-based biomaterials with tailored function, we investigated the structure of a tri-β3-peptide nanoassembly by molecular dynamics simulations and X-ray fiber diffraction analysis. Diffraction data was collected from aligned fibrils formed by Ac-β3[LIA] in water and used to inform and validate the model structure. Models with 3-fold radial symmetry resulted in stable fibers with a triple-helical coiled-coil motif and measurable helical pitch and periodicity. The fiber models revealed a hydrophobic core and twist along the fiber axis arising from a maximization of contacts between hydrophobic groups of adjacent tripeptides on the solvent-exposed fiber surface. These atomic structures of macroscale fibers derived from β3-peptide-based materials provide valuable insight into the effects of the geometric placement of the side chains and the influence of solvent on the core fiber structure which is perpetuated in the superstructure morphology.
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Affiliation(s)
| | - Zahraa S Al-Garawi
- School of Life Sciences , University of Sussex , Falmer , East Sussex BN1 9QG , U.K
- Chemistry Department , Mustansiriyah University , Baghdad Iraq
| | - Nevena Todorova
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
| | - Jack Turner
- School of Life Sciences , University of Sussex , Falmer , East Sussex BN1 9QG , U.K
| | - Mark P Del Borgo
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Melbourne , Victoria 3800 , Australia
| | - Louise C Serpell
- School of Life Sciences , University of Sussex , Falmer , East Sussex BN1 9QG , U.K
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology and Biomedicine Discovery Institute , Monash University , Melbourne , Victoria 3800 , Australia
| | - Irene Yarovsky
- School of Engineering , RMIT University , Melbourne , Victoria 3001 , Australia
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Del Borgo MP, Kulkarni K, Tonta MA, Ratcliffe JL, Seoudi R, Mechler AI, Perlmutter P, Parkington HC, Aguilar MI. β3-tripeptides act as sticky ends to self-assemble into a bioscaffold. APL Bioeng 2018; 2:026104. [PMID: 31069301 PMCID: PMC6481712 DOI: 10.1063/1.5020105] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Accepted: 04/03/2018] [Indexed: 12/27/2022] Open
Abstract
Peptides comprised entirely of β3-amino acids, commonly referred to as β-foldamers, have been shown to self-assemble into a range of materials. Previously, β-foldamers have been functionalised via various side chain chemistries to introduce function to these materials without perturbation of the self-assembly motif. Here, we show that insertion of both rigid and flexible molecules into the backbone structure of the β-foldamer did not disturb the self-assembly, provided that the molecule is positioned between two β3-tripeptides. These hybrid β3-peptide flanked molecules self-assembled into a range of structures. α-Arginlyglycylaspartic acid (RGD), a commonly used cell attachment motif derived from fibronectin in the extracellular matrix, was incorporated into the peptide sequence in order to form a biomimetic scaffold that would support neuronal cell growth. The RGD-containing sequence formed the desired mesh-like scaffold but did not encourage neuronal growth, possibly due to over-stimulation with RGD. Mixing the RGD peptide with a β-foldamer without the RGD sequence produced a well-defined scaffold that successfully encouraged the growth of neurons and enabled neuronal electrical functionality. These results indicate that β3-tripeptides can form distinct self-assembly units separated by a linker and can form fibrous assemblies. The linkers within the peptide sequence can be composed of a bioactive α-peptide and tuned to provide a biocompatible scaffold.
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Affiliation(s)
- Mark P. Del Borgo
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
- Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Ketav Kulkarni
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
- Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Mary A. Tonta
- Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
- Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Jessie L. Ratcliffe
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
- Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
| | - Rania Seoudi
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, VIC 3086, Australia
| | - Adam I. Mechler
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, VIC 3086, Australia
| | | | - Helena C. Parkington
- Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
- Department of Physiology, Monash University, Clayton, VIC 3800, Australia
| | - Marie-Isabel Aguilar
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
- Biomedicine Discovery Institute, Monash University, Clayton, VIC 3800, Australia
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Buchanan C, Garvey CJ, Perlmutter P, Mechler A. Co-assembly of helical β3-peptides: a self-assembled analogue of a statistical copolymer. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2017-0709] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
AbstractUnnatural peptide self-assembly offers the means to design hierarchical nanostructures of controlled geometries, chemical function and physical properties. N-acyl β3 peptides, where all residues are unnatural amino acids, are able to form helical fibrous structures by a head-to-tail assembly of helical monomers, extending the helix via a three point supramolecular hydrogen bonding motif. These helical nanorods were shown to be stable under a wide range of physical conditions, offering a self-assembled analogue of polymeric fibres. Hitherto the self-assembly has only been demonstrated between identical monomers; however the self-assembly motif is sequence-independent, offering the possibility of hetero-assembly of different peptide monomers. Here we present a proof of principle study of head-to-tail co-assembly of two different helical unnatural peptides Ac-β3[WELWEL] and Ac-β3[LIA], where the letters denote the β3 analogues of natural amino acids. By atomic force microscopy imaging it was demonstrated that the homo-assembly and co-assembly of these peptides yield characteristically different structures. Synchrotron small angle X-ray scattering experiments have confirmed the presence of the fibres in the solution and the averaged diameters from modelled data correlate well to the results of AFM imaging. Hence, there is evidence of co-assembly of the fibrous superstructures; given that different monomers may be used to introduce variations into chemical and physical properties, the results demonstrate a self-assembled analogue of a statistical co-polymer that can be used in designing complex functional nanomaterials.
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Affiliation(s)
- Claire Buchanan
- La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria, Australia
| | | | | | - Adam Mechler
- La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria, Australia
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Seoudi RS, Mechler A. Design Principles of Peptide Based Self-Assembled Nanomaterials. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2017; 1030:51-94. [DOI: 10.1007/978-3-319-66095-0_4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Del Borgo MP, Kulkarni K, Aguilar MI. Unique Functional Materials Derived from β-Amino Acid Oligomers. Aust J Chem 2017. [DOI: 10.1071/ch16511] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
The unique structures formed by β-amino acid oligomers, or β-peptide foldamers, have been studied for almost two decades, which has led to the discovery of several distinctive structures and bioactive molecules. Recently, this area of research has expanded from conventional peptide drug design to the formation of assemblies and nanomaterials by peptide self-assembly. The unique structures formed by β-peptides give rise to a set of new materials with altered properties that differ from conventional peptide-based materials; such new materials may be useful in several bio- and nanomaterial applications.
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15
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Samanta A, Liu Z, Nalluri SKM, Zhang Y, Schatz GC, Stoddart JF. Supramolecular Double-Helix Formation by Diastereoisomeric Conformations of Configurationally Enantiomeric Macrocycles. J Am Chem Soc 2016; 138:14469-14480. [PMID: 27709916 DOI: 10.1021/jacs.6b09258] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Solid-state superstructures, resulting from assemblies programmed by homochirality, are attracting considerable attention. In addition, artificial double-helical architectures are being investigated, especially in relation to the ways in which homochiral small molecules can be induced to yield helical forms as a result of chiral induction. Herein, we report the highly specific self-assembly upon crystallization of a double-helical superstructure from an enantiopure macrocyclic dimer which adopts two diastereoisomeric conformations in a molar ratio of 1.5:1 in dimethyl sulfoxide. These two conformational diastereoisomers self-organize-and self-sort-in the crystalline phase in equimolar proportions to form two single-handed helices which are complementary to each other, giving rise to the assembly of a double helix that is stabilized by intermolecular [C-H···O] and π-π stacking interactions. The observed self-sorting phenomenon occurs on going from a mixed-solvent system containing two equilibrating conformational diastereoisomers, presumably present in unequal molar proportions, into the solid state. The diastereoisomeric conformations are captured upon crystallization in a 1:1 molar ratio in the double-helical superstructure, whose handedness is dictated by the choice of the enantiomeric macrocyclic dimer. The interconversion of the two conformational diastereoisomers derived from each configurationally enantiomeric macrocycle was investigated in CD3SOCD3 solution by variable-temperature 1H NMR spectroscopy (VT NMR) and circular dichroism (VT CD). The merging of the resonances for the protons corresponding to the two diastereoisomers at a range of coalescence temperatures in the VT NMR spectra and occurrence of the isosbestic points in the VT CD spectra indicate that the two diastereoisomers are interconverting slowly in solution on the 1H NMR time scale but rapidly on the laboratory time scale. To the best of our knowledge, the self-assembly of such solid-state superstructures from two conformational diastereoisomers of a homochiral macrocycle is a rare, if not unique, occurrence.
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Affiliation(s)
- Avik Samanta
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Zhichang Liu
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Siva Krishna Mohan Nalluri
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - Yu Zhang
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - George C Schatz
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
| | - J Fraser Stoddart
- Department of Chemistry, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3113, United States
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16
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Liu J, Morikawa MA, Lei H, Ishiba K, Kimizuka N. Hierarchical Self-Assembly of Luminescent Tartrate-Bridged Chiral Binuclear Tb(III) Complexes in Ethanol. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10597-10603. [PMID: 27682007 DOI: 10.1021/acs.langmuir.6b02254] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A new family of supramolecular metalloamphiphiles carrying two metal centers is developed. They are formed by bridging two coordinatively unsaturated lipophilic Tb3+ complexes (TbL+) with chiral dicarboxylate anions. The formation of bridging coordination bonds is confirmed using UV spectroscopy, induced circular dichroism (ICD), increased luminescence intensity of TbL+, and electrospray ionization mass spectrometry (ESIMS) analysis. These supramolecular metalloamphiphiles hierarchically self-assemble in ethanol to give luminescent nanospheres, as observed using transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The two hydroxyl groups introduced in the bridging ligands of [TbL]2(d-/l-tartrate) significantly promote self-assembly by increasing coherent forces via intermolecular hydrogen bonding. The observed self-assembly in ethanol also merits mention because such polar alcoholic media have been unfavorable for conventional molecular self-assemblies. The present approach offers a new molecular design strategy for composable metalloamphiphiles.
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Affiliation(s)
- Jing Liu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University , Xi'an 710119, P. R. China
| | - Masa-Aki Morikawa
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University , 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hairui Lei
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry & Chemical Engineering, Shaanxi Normal University , Xi'an 710119, P. R. China
| | - Keita Ishiba
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University , 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Nobuo Kimizuka
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Center for Molecular Systems (CMS), Kyushu University , 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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17
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Seoudi RS, Hinds MG, Wilson DJD, Adda CG, Del Borgo M, Aguilar MI, Perlmutter P, Mechler A. Self-assembled nanomaterials based on beta (β(3)) tetrapeptides. NANOTECHNOLOGY 2016; 27:135606. [PMID: 26909736 DOI: 10.1088/0957-4484/27/13/135606] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
β(3)-amino acid based polypeptides offer a unique starting material for the design of self-assembled nanostructures such as fibres and hierarchical dendritic assemblies, due to their well-defined helical geometry in which the peptide side chains align at 120° due to the 3.0-3.1 residue pitch of the helix. In a previous work we have described the head-to-tail self-assembly of N-terminal acetylated β(3)-peptides into infinite helical nanorods that was achieved by designing a bioinspired supramolecular self-assembly motif. Here we describe the effect of consecutively more polar side chains on the self-assembly characteristics of β(3)-tetrapeptides Ac-β (3)Ala-β(3)Leu-β(3)Ile-β(3)Ala (Ac-β(3)[ALIA]), Ac-β(3)Ser-β(3)Leu-β(3)Ile-β(3)Ala (Ac-β(3)[SLIA]) and Ac-β (3)Lys-β (3)Leu-β(3)Ile-β (3)Glu (Ac-β(3)[KLIE]). β(3)-tetrapeptides complete 1 1/3 turns of the helix: thus in the oligomeric form the side chain positions shift 120° with each added monomer, forming a regular periodic pattern along the nanorod. Dynamic light scattering (DLS) measurements confirmed that these peptides self-assemble even in highly polar solvents such as water and DMSO, while diffusion-ordered NMR spectroscopy revealed the presence of a substantial monomeric population. Temperature dependence of the size distribution in DLS measurements suggests a dynamic equilibrium between monomers and oligomers. Solution casting produced distinct fibrillar deposits after evaporating the solvent. In the case of the apolar Ac-β(3)[ALIA] the longitudinal helix morphology gives rise to geometrically defined (∼70°) junctions between fibres, forming a mesh that opens up possibilities for applications e.g. in tissue scaffolding. The deposits of polar Ac-β(3)[SLIA] and Ac-β(3)[KLIE] exhibit fibres in regular parallel alignment over surface areas in the order of 10 μm.
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Affiliation(s)
- Rania S Seoudi
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia
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18
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Motamed S, Del Borgo MP, Kulkarni K, Habila N, Zhou K, Perlmutter P, Forsythe JS, Aguilar MI. A self-assembling β-peptide hydrogel for neural tissue engineering. SOFT MATTER 2016; 12:2243-2246. [PMID: 26853859 DOI: 10.1039/c5sm02902c] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We report a new class of β-peptide based hydrogel for neural tissue engineering. Our β-peptide forms a network of nanofibres in aqueous solution, resulting in a stable hydrogel at physiological conditions. The hydrogel shows excellent compatibility with neural cells and provides a suitable environment for cells to adhere and proliferate.
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Affiliation(s)
- S Motamed
- Department of Materials Science and Engineering, Monash Institute of Medical Engineering, Monash University, Clayton, Vic 3800, Australia.
| | - M P Del Borgo
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology, Monash University, Clayton, Vic 3800, Australia.
| | - K Kulkarni
- School of Chemistry, Monash University, Clayton, Vic 3800, Australia
| | - N Habila
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology, Monash University, Clayton, Vic 3800, Australia.
| | - K Zhou
- Department of Materials Science and Engineering, Monash Institute of Medical Engineering, Monash University, Clayton, Vic 3800, Australia.
| | - P Perlmutter
- School of Chemistry, Monash University, Clayton, Vic 3800, Australia
| | - J S Forsythe
- Department of Materials Science and Engineering, Monash Institute of Medical Engineering, Monash University, Clayton, Vic 3800, Australia.
| | - M I Aguilar
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology, Monash University, Clayton, Vic 3800, Australia.
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Luder K, Kulkarni K, Lee HW, Widdop RE, Del Borgo MP, Aguilar MI. Decorated self-assembling β3-tripeptide foldamers form cell adhesive scaffolds. Chem Commun (Camb) 2016; 52:4549-52. [DOI: 10.1039/c6cc00247a] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
β-Peptide foldamers were functionalised with the cell recognition motifs RGD or IKVAV, self-assembled into fibres, and co-assembled with non-functionalised β-peptides to yield tunable bioscaffolds with cell adhering properties.
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Affiliation(s)
- Kerstin Luder
- Department of Biochemistry & Molecular Biology
- Monash University
- Clayton
- Australia
| | - Ketav Kulkarni
- Department of Biochemistry & Molecular Biology
- Monash University
- Clayton
- Australia
| | - Huey Wen Lee
- Department of Pharmacology
- Monash University
- Clayton
- Australia
| | | | - Mark P. Del Borgo
- Department of Biochemistry & Molecular Biology
- Monash University
- Clayton
- Australia
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Seoudi RS, Dowd A, Smith BJ, Mechler A. Structural analysis of bioinspired nano materials with synchrotron far IR spectroscopy. Phys Chem Chem Phys 2016; 18:11467-73. [DOI: 10.1039/c6cp01355d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Synchrotron far-infrared spectroscopy was used in conjunction with density functional theory vibrational analysis to ascertain the core structure of self-assembled fibrous superstructures formed by unnatural β3-tripeptides.
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Affiliation(s)
- Rania S. Seoudi
- Department of Chemistry and Physics
- La Trobe Institute for Molecular Science
- La Trobe University
- Melbourne
- Australia
| | - Annette Dowd
- School of Mathematical and Physical Sciences
- University of Technology Sydney
- Australia
| | - Brian J. Smith
- Department of Chemistry and Physics
- La Trobe Institute for Molecular Science
- La Trobe University
- Melbourne
- Australia
| | - Adam Mechler
- Department of Chemistry and Physics
- La Trobe Institute for Molecular Science
- La Trobe University
- Melbourne
- Australia
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21
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Kulkarni K, Motamed S, Habila N, Perlmutter P, Forsythe JS, Aguilar MI, Del Borgo MP. Orthogonal strategy for the synthesis of dual-functionalised β3-peptide based hydrogels. Chem Commun (Camb) 2016; 52:5844-7. [DOI: 10.1039/c6cc00624h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We describe a new class of hydrogelator based on helical β3-peptide foldamers carrying a bioactive payload. The β3-peptides self-assemble to form a nanofibrous mesh resulting in a stable hydrogel. Co-incubation with different β3-peptide monomers allowed tuning of cell adherence.
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Affiliation(s)
- Ketav Kulkarni
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology
- Monash University
- Clayton Vic
- Australia
- School of Chemistry
| | - Sepideh Motamed
- Department of Material Science and Engineering
- Monash Institute of Medical Engineering
- Monash University
- Australia
| | - Nathan Habila
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology
- Monash University
- Clayton Vic
- Australia
| | | | - John S. Forsythe
- Department of Material Science and Engineering
- Monash Institute of Medical Engineering
- Monash University
- Australia
| | - Marie-Isabel Aguilar
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology
- Monash University
- Clayton Vic
- Australia
| | - Mark P. Del Borgo
- Monash Biomedicine Discovery Institute and Department of Biochemistry & Molecular Biology
- Monash University
- Clayton Vic
- Australia
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22
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Gopalan R, Del Borgo M, Mechler A, Perlmutter P, Aguilar MI. Geometrically Precise Building Blocks: the Self-Assembly of β-Peptides. ACTA ACUST UNITED AC 2015; 22:1417-1423. [DOI: 10.1016/j.chembiol.2015.10.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Revised: 09/30/2015] [Accepted: 10/03/2015] [Indexed: 12/23/2022]
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23
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Seoudi RS, Dowd A, Del Borgo M, Kulkarni K, Perlmutter P, Aguilar MI, Mechler A. Amino acid sequence controls the self-assembled superstructure morphology of N-acetylated tri-β3-peptides. PURE APPL CHEM 2015. [DOI: 10.1515/pac-2015-0108] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractPeptides based on unnatural β3-amino acids offer a versatile platform for the design of self-assembling nanostructures due to the folding stability of the 14-helix and the high symmetry of the side chains inherent in this geometry. We have previously described that N-terminal acetylation (Ac-) forms a supramolecular self-assembly motif that allows β3-peptides to assemble head-to-tail into a helical nanorod which then further bundles into hierarchical superstructures. Here we investigate the effect of the topography of the 14-helical nanorod on lateral self-assembly. Specifically, we report on the variations in the superstructure of three isomeric peptides comprising the same three β3-amino acid residues: β3-leucine (L), β3-isoleucine (I) β3-alanine (A) to give peptides Ac-β3[LIA], Ac-β3[IAL] and Ac-β3[ALI]. AFM imaging shows markedly different superstructures for the three peptides. Well defined synchrotron far-infrared spectra reveal uniform geometries with a high degree of similarity between the isomeric peptides in the amide modes of the 400–650 wavenumber range. Far-IR also confirms that the C-terminal carboxyl group is free in the assemblies, thus it is solvated in the dispersant. Hence, the differences in the superstructures formed by the fibers are defined primarily by van der Waals energy minimization between the varied cross sectional morphologies of the core nanorods.
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Affiliation(s)
| | | | - Mark Del Borgo
- 3Department of Biochemistry and Molecular Biology, Monash University, Australia
| | - Ketav Kulkarni
- 3Department of Biochemistry and Molecular Biology, Monash University, Australia
| | | | | | - Adam Mechler
- 1La Trobe Institute for Molecular Science, Department of Chemistry and Physics, La Trobe University, Melbourne, Victoria, Australia
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