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Gu L, Jiang Y, Hu J. Facile Preparation of Highly Stretchable and Recovery Peptide-Polyurethane/Ureas. Polymers (Basel) 2018; 10:E637. [PMID: 30966671 PMCID: PMC6403790 DOI: 10.3390/polym10060637] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2018] [Revised: 06/04/2018] [Accepted: 06/05/2018] [Indexed: 11/24/2022] Open
Abstract
In this work, a new class of highly stretchable peptide-polyurethane/ureas (PUUs) were synthesized containing short β-sheet forming peptide blocks of poly(γ-benzyl-l-glutamate)-b-poly(propylene glycol)-b-poly(γ-benzyl-l-glutamate) (PBLG-b-PPG-b-PBLG), isophorone diisocyanate as the hard segment, and polytetramethylene ether glycol as the soft phase. PBLG-b-PPG-b-PBLG with short peptide segment length (<10 residues) was synthesized by amine-initiated ring opening polymerization of γ-benzyl-l-glutamate-N-carboxyanhydrides (BLG-NCA), which shows mixed α-helix and β-sheet conformation, where the percent of β-sheet structure was above 48%. Morphological studies indicate that the obtained PUUs show β-sheet crystal and nanofibrous structure. Mechanical tests reveal the PUUs display medium tensile strength (0.25⁻4.6 MPa), high stretchability (>1600%), human-tissue-compatible Young's modulus (226⁻513 KPa). Furthermore, the shape recovery ratio could reach above 85% during successive cycles at high strain (500%). In this study, we report a facile synthetic method to obtain highly stretchable and recovery peptide-polyurethane/urea materials, which will have various potential applications such as wearable and implantable electronics, and biomedical devices.
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Affiliation(s)
- Lin Gu
- Key Laboratory of Marine Materials and Related Technologies, Key Laboratory of Marine Materials and Protective Technologies of Zhejiang Province, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China.
- Institute of Textiles & Clothing, The Hong Kong Polytechnic University, Hong Kong 999077, China.
| | - Yuanzhang Jiang
- Institute of Textiles & Clothing, The Hong Kong Polytechnic University, Hong Kong 999077, China.
| | - Jinlian Hu
- Institute of Textiles & Clothing, The Hong Kong Polytechnic University, Hong Kong 999077, China.
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2
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Bochicchio B, Bracalello A, Pepe A. Characterization of a Crosslinked Elastomeric-Protein Inspired Polypeptide. Chirality 2016; 28:606-11. [PMID: 27403636 DOI: 10.1002/chir.22619] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 06/07/2016] [Accepted: 06/07/2016] [Indexed: 11/10/2022]
Abstract
Materials inspired by natural proteins have a great appeal in tissue engineering for their biocompatibility and similarity to extracellular matrix (ECM). Chimeric polypeptides inspired by elastomeric proteins such as silk, elastin, and collagen are of outstanding interest in the field. A recombinant polypeptide constituted of three different blocks, each of them having sequences derived from elastin, resilin, and collagen proteins, was demonstrated to be a good candidate as biomaterial for its self-assembling characteristics and biocompatibility. Herein, taking advantage of the primary amine functionalities present in the linear polypeptide, we crosslinked it with 1,6-hexamethylene-diisocyanate (HMDI). The characterization of the obtained polypeptide was realized by CD spectroscopy, AFM, and SEM microscopies. The obtained results, although not conclusive, demonstrate that the crosslinked polypeptide gave rise to porous networks, thin nanowires, and films not observable for the linear polypeptide. Chirality 28:606-611, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Brigida Bochicchio
- Laboratory of Protein-Inspired Materials, Department of Science, University of Basilicata, Potenza, Italy
| | - Angelo Bracalello
- Laboratory of Protein-Inspired Materials, Department of Science, University of Basilicata, Potenza, Italy
| | - Antonietta Pepe
- Laboratory of Protein-Inspired Materials, Department of Science, University of Basilicata, Potenza, Italy
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3
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Taniguchi S, Watanabe N, Nose T, Maeda I. Development of short and highly potent self-assembling elastin-derived pentapeptide repeats containing aromatic amino acid residues. J Pept Sci 2015; 22:36-42. [PMID: 26662843 DOI: 10.1002/psc.2837] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 10/11/2015] [Accepted: 10/21/2015] [Indexed: 11/07/2022]
Abstract
Tropoelastin is the primary component of elastin, which forms the elastic fibers that make up connective tissues. The hydrophobic domains of tropoelastin are thought to mediate the self-assembly of elastin into fibers, and the temperature-mediated self-assembly (coacervation) of one such repetitive peptide sequence (VPGVG) has been utilized in various bio-applications. To elucidate a mechanism for coacervation activity enhancement and to develop more potent coacervatable elastin-derived peptides, we synthesized two series of peptide analogs containing an aromatic amino acid, Trp or Tyr, in addition to Phe-containing analogs and tested their functional characteristics. Thus, position 1 of the hydrophobic pentapeptide repeat of elastin (X(1)P(2)G(3)V(4)G(5)) was substituted by Trp or Tyr. Eventually, we acquired a novel, short Trp-containing elastin-derived peptide analog (WPGVG)3 with potent coacervation ability. From the results obtained during this process, we determined the importance of aromaticity and hydrophobicity for the coacervation potency of elastin-derived peptide analogs. Generally, however, the production of long-chain synthetic polypeptides in quantities sufficient for commercial use remain cost-prohibitive. Therefore, the identification of (WPGVG)3, which is a 15-mer short peptide consisting simply of five natural amino acids and shows temperature-dependent self-assembly activity, might serve as a foundation for the development of various kinds of biomaterials.
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Affiliation(s)
- Suguru Taniguchi
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, Iizuka, Fukuoka, 820-8502, Japan
| | - Noriko Watanabe
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, Iizuka, Fukuoka, 820-8502, Japan
| | - Takeru Nose
- Faculty of Arts and Science, Kyushu University, Fukuoka, 819-0395, Japan
| | - Iori Maeda
- Department of Bioscience and Bioinformatics, Kyushu Institute of Technology, Iizuka, Fukuoka, 820-8502, Japan
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4
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Yano S, Mori M, Teramoto N, Iisaka M, Suzuki N, Noto M, Kaimoto Y, Kakimoto M, Yamada M, Shiratsuchi E, Shimasaki T, Shibata M. Preparation of photocrosslinked fish elastin polypeptide/microfibrillated cellulose composite gels with elastic properties for biomaterial applications. Mar Drugs 2015; 13:338-53. [PMID: 25584682 PMCID: PMC4306940 DOI: 10.3390/md13010338] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 12/26/2014] [Indexed: 01/13/2023] Open
Abstract
Photocrosslinked hydrogels reinforced by microfibrillated cellulose (MFC) were prepared from a methacrylate-functionalized fish elastin polypeptide and MFC dispersed in dimethylsulfoxide (DMSO). First, a water-soluble elastin peptide with a molecular weight of ca. 500 g/mol from the fish bulbus arteriosus was polymerized by N,N'-dicyclohexylcarbodiimide (DCC), a condensation reagent, and then modified with 2-isocyanatoethyl methacrylate (MOI) to yield a photocrosslinkable fish elastin polypeptide. The product was dissolved in DMSO and irradiated with UV light in the presence of a radical photoinitiator. We obtained hydrogels successfully by substitution of DMSO with water. The composite gel with MFC was prepared by UV irradiation of the photocrosslinkable elastin polypeptide mixed with dispersed MFC in DMSO, followed by substitution of DMSO with water. The tensile test of the composite gels revealed that the addition of MFC improved the tensile properties, and the shape of the stress-strain curve of the composite gel became more similar to the typical shape of an elastic material with an increase of MFC content. The rheology measurement showed that the elastic modulus of the composite gel increased with an increase of MFC content. The cell proliferation test on the composite gel showed no toxicity.
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Affiliation(s)
- Shinya Yano
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Megumi Mori
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Naozumi Teramoto
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Makoto Iisaka
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Natsumi Suzuki
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Masanari Noto
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Yasuko Kaimoto
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Masashi Kakimoto
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Michio Yamada
- Research & Development Division, Hayashikane Sangyo Co., Ltd., 2-4-8 Yamato-machi, Shimonoseki, Yamaguchi 750-8608, Japan.
| | - Eri Shiratsuchi
- Research & Development Division, Hayashikane Sangyo Co., Ltd., 2-4-8 Yamato-machi, Shimonoseki, Yamaguchi 750-8608, Japan.
| | - Toshiaki Shimasaki
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
| | - Mitsuhiro Shibata
- Department of Life and Environmental Sciences, Faculty of Engineering, Chiba Institute of Technology, 2-17-1 Tsudanuma, Narashino, Chiba 275-0016, Japan.
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5
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Shang Y, Yan Y, Hou X. Stimuli responsive elastin-like polypeptides and applications in medicine and biotechnology. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2013; 25:101-20. [DOI: 10.1080/09205063.2013.841073] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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6
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Srokowski EM, Woodhouse KA. Development and characterisation of novel cross-linked bio-elastomeric materials. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 19:785-99. [DOI: 10.1163/156856208784522038] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Elizabeth M. Srokowski
- a Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, RM 363, Toronto, ON, Canada M5S 3E5
| | - Kimberly A. Woodhouse
- b Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, RM 363, Toronto, ON, Canada M5S 3E5; Advanced Regenerative Tissue Engineering Centre, Sunnybrook Health Sciences Centre, 2075 Bayview Avenue, Toronto, ON, Canada M4N 3M5
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7
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Maeda I, Fukumoto Y, Nose T, Shimohigashi Y, Nezu T, Terada Y, Kodama H, Kaibara K, Okamoto K. Structural requirements essential for elastin coacervation: favorable spatial arrangements of valine ridges on the three-dimensional structure of elastin-derived polypeptide (VPGVG)n. J Pept Sci 2011; 17:735-43. [DOI: 10.1002/psc.1394] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2011] [Revised: 05/30/2011] [Accepted: 06/15/2011] [Indexed: 11/11/2022]
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8
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Kushner AM, Guan Z. Modulares Design in natürlichen und biomimetischen elastischen Materialien. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201006496] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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9
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Kushner AM, Guan Z. Modular design in natural and biomimetic soft materials. Angew Chem Int Ed Engl 2011; 50:9026-57. [PMID: 21898722 DOI: 10.1002/anie.201006496] [Citation(s) in RCA: 142] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2010] [Indexed: 11/09/2022]
Abstract
Under eons of evolutionary and environmental pressure, biological systems have developed strong and lightweight peptide-based polymeric materials by using the 20 naturally occurring amino acids as principal monomeric units. These materials outperform their man-made counterparts in the following ways: 1) multifunctionality/tunability, 2) adaptability/stimuli-responsiveness, 3) synthesis and processing under ambient and aqueous conditions, and 4) recyclability and biodegradability. The universal design strategy that affords these advanced properties involves "bottom-up" synthesis and modular, hierarchical organization both within and across multiple length-scales. The field of "biomimicry"-elucidating and co-opting nature's basic material design principles and molecular building blocks-is rapidly evolving. This Review describes what has been discovered about the structure and molecular mechanisms of natural polymeric materials, as well as the progress towards synthetic "mimics" of these remarkable systems.
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Affiliation(s)
- Aaron M Kushner
- Department of Chemistry, University of California, Irvine, CA 92697-2025, USA
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10
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Bracalello A, Santopietro V, Vassalli M, Marletta G, Del Gaudio R, Bochicchio B, Pepe A. Design and production of a chimeric resilin-, elastin-, and collagen-like engineered polypeptide. Biomacromolecules 2011; 12:2957-65. [PMID: 21707089 DOI: 10.1021/bm2005388] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Protein-inspired biomaterials have gained great interest as an alternative to synthetic polymers, in particular, for their potential use as biomedical devices. The potential inspiring models are mainly proteins able to confer mechanical properties to tissues and organs, such as elasticity (elastin, resilin, spider silk) and strength (collagen, silk). The proper combination of repetitive sequences, each of them derived from different proteins, represents a useful tool for obtaining biomaterials with tailored mechanical properties and biological functions. In this report we describe the design, the production, and the preliminary characterization of a chimeric polypeptide, based on sequences derived from the highly resilient proteins resilin and elastin and from collagen-like sequences. The results show that the obtained chimeric recombinant material exhibits promising self-assembling properties. Young's modulus of the fibers was determined by AFM image analysis and lies in the range of 0.1-3 MPa in agreement with the expectations for elastin-like and resilin-like materials.
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Affiliation(s)
- Angelo Bracalello
- Department of Chemistry Antonio M. Tamburrro, University of Basilicata , 85100 Potenza, Italy
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11
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del Mercato LL, Maruccio G, Pompa PP, Bochicchio B, Tamburro AM, Cingolani R, Rinaldi R. Amyloid-like Fibrils in Elastin-Related Polypeptides: Structural Characterization and Elastic Properties. Biomacromolecules 2008; 9:796-803. [DOI: 10.1021/bm7010104] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Loretta L. del Mercato
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
| | - Giuseppe Maruccio
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
| | - Pier Paolo Pompa
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
| | - Brigida Bochicchio
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
| | - Antonio M. Tamburro
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
| | - Roberto Cingolani
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
| | - Ross Rinaldi
- National Nanotechnology Laboratory of INFM-CNR, IIT Research Unit, ISUFI, University of Salento, Via per Arnesano, 73100 Lecce, Italy, and Department of Chemistry, University of Basilicata,Via N. Sauro, 85100 Potenza, Italy
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12
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Bochicchio B, Pepe A, Flamia R, Lorusso M, Tamburro AM. Investigating the Amyloidogenic Nanostructured Sequences of Elastin: Sequence Encoded by Exon 28 of Human Tropoelastin Gene. Biomacromolecules 2007; 8:3478-86. [DOI: 10.1021/bm700636a] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Pepe A, Bochicchio B, Tamburro AM. Supramolecular organization of elastin and elastin-related nanostructured biopolymers. Nanomedicine (Lond) 2007; 2:203-18. [PMID: 17716121 DOI: 10.2217/17435889.2.2.203] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The ultrastructure of elastin has been extensively analyzed by different methodologies. Starting from the first descriptions, where elastin was depicted as an amorphous structure, more complex and, in some cases, varied morphologies were revealed. The supramolecular structures found for elastin have been compared with those found for other elastin-related polypeptides, such as alpha-elastin and tropoelastin, and very similar features emerged. This review will deal with the supramolecular organization exhibited by many elastin-related compounds, starting from elastin, going through polypeptides constituted by different domains of tropoelastin, up to polymers containing repetitive sequences of elastin. In particular, recent developments on biopolymers of general type poly(Val-Pro-Gly-Xaa-Gly) and poly(Xaa-Gly-Gly-Zaa-Gly) (Xaa, Zaa = Val, Leu, Lys, Glu, Orn) obtained either by chemical synthesis or recombinant DNA techniques will be discussed in detail. The general aim is to describe the supramolecular features useful for the identification of elastin-inspired nanostructured biopolymers for developing highly functional and biocompatible vascular grafts as well as scaffolds for tissue regeneration.
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Affiliation(s)
- Antonietta Pepe
- Università della Basilicata, Department of Chemistry, Via N. Sauro 85, 85100 Potenza, Italy.
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14
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Bochicchio B, Jimenez-Oronoz F, Pepe A, Blanco M, Sandberg LB, Tamburro AM. Synthesis of and Structural Studies on Repeating Sequences of Abductin. Macromol Biosci 2005; 5:502-11. [PMID: 15948227 DOI: 10.1002/mabi.200500007] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Little data exist on the structure and function of compressible elastomeric proteins such as abductin. An understanding of the underlying structural features of these proteins may lead to the development of a new class of highly tailored "compressible" hydrogels. To that effect, in this work, the structure of abductin was investigated by means of studies on several synthetic peptides corresponding to the most frequent sequences of abductin. In particular, the 10 amino acid abductin peptide sequence FGGMGGGNAG, tandem repeated in the protein, and two related 25 and 40 amino acid polypeptides were synthesized. These peptides were studied with regard to secondary structure, self-assembly, and polymer morphology. The results obtained with these peptides allow us to propose a preliminary structure-elasticity relationship for abductin not dissimilar from that currently accepted for elastin.A possible mechanism of elasticity relating abductin to elastin.
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Affiliation(s)
- Brigida Bochicchio
- Dipartimento di Chimica, Università degli Studi della Basilicata, Via Nazario Sauro 85, 85100 Potenza, Italy
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15
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Pepe A, Guerra D, Bochicchio B, Quaglino D, Gheduzzi D, Pasquali Ronchetti I, Tamburro AM. Dissection of human tropoelastin: supramolecular organization of polypeptide sequences coded by particular exons. Matrix Biol 2005; 24:96-109. [PMID: 15890261 DOI: 10.1016/j.matbio.2005.01.004] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2004] [Revised: 01/29/2005] [Accepted: 01/31/2005] [Indexed: 10/25/2022]
Abstract
Polypeptide sequences encoded by some exons of the human tropoelastin gene (EDP, elastin-derived peptide) have been analysed for their ability to coacervate and to self-assembly. The great majority of them were shown to form organized structures, but only a few were indeed able to coacervate. Negative staining and rotary shadowing transmission electron microscopy showed the polypeptides to adopt a variety of supramolecular organization, from filaments, as those typical of tropoelastin, to amyloid-like fibers. The results obtained gave significant insight to the possible roles played by specific polypeptide sequences of tropoelastin.
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Affiliation(s)
- Antonietta Pepe
- Department of Chemistry, Università della Basilicata, Via N. Sauro 85, 85100 Potenza, Italy
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16
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Flamia R, Lanza G, Salvi AM, Castle JE, Tamburro AM. Conformational Study and Hydrogen Bonds Detection on Elastin-Related Polypeptides Using X-ray Photoelectron Spectroscopy. Biomacromolecules 2005; 6:1299-309. [PMID: 15877345 DOI: 10.1021/bm049290s] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The chemical bonds of the pentapeptide sequence of elastin ValGlyGlyValGly (VGGVG), both in its monomer and polymer forms, were correlated with their XPS spectra through a well-established curve-fitting procedure. To aid in this correlation, the C1s, O1s, and N1s chemical shifts of the Boc-VGGVG-OEt, were validated by theoretical calculations, performed in the framework of the Koopman approximation of HF/6-31G molecular orbitals, leading to the "preferred" conformation of the protected monomer. Then the same curve-fitting procedure was adopted for interpreting the XPS spectra of the polypentapeptide as a powder, and the XPS results obtained both for monomer and polymer compounds were compared with those obtained by FT-IR. The polymer was then analyzed after deposition onto a silicon substrate, Si(100), either from methanol or water suspensions and the presence of hydrogen bonds was detected at the polymer/substrate interface and between the polymer chains. The "surface rearrangement" that could be inferred from XPS results strongly confirms that derived from AFM images previously obtained under the same experimental conditions. In particular, the observed amyloid conformation is stabilized by hydrogen bonds to water molecules included in the structure while the formation of the beaded string structure observed in deposits from methanolic suspension is probably mediated by hydrogen bonds to the hydrated silicon surface.
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Affiliation(s)
- Roberta Flamia
- Dipartimento di Chimica, Università della Basilicata, via N. Sauro 85. 85100 Potenza, Italy, and School of Engineering, University of Surrey, Guildford GU2 7XH, Surrey, United Kingdom
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17
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Samouillan V, André C, Dandurand J, Lacabanne C. Effect of water on the molecular mobility of elastin. Biomacromolecules 2005; 5:958-64. [PMID: 15132687 DOI: 10.1021/bm034436t] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Purified and hydrated elastin is studied by both thermal and dielectric techniques to have insight into the chain dynamics of this protein. By differential scanning calorimetry, the glassy behavior of elastin is highlighted; the glass transition temperature (T(g)) of elastin is found to be widely dependent on hydration, falling from 200 degrees C in the dehydrated state to 30 degrees C for 30% hydration. A limit of T(g) at around 0 degrees C is found when crystallizable water is present in the system, that is, when the formation of ice prevents motions of some 10 nm along the polypeptidic chains. The technique of thermally stimulated currents, carried out in the -180 to 0 degrees C temperature range, is useful to detect localized motions. In this case, too, the localized motions vary considerably according to hydration: a first relaxation mode is observed at -145 degrees C and it is associated with the reorientation of crystallizable water in ice I; a second relaxation mode, more complex and cooperative, occurs at around -80 degrees C and could be attributed to the complex constituted by the dipolar groups of the polypeptidic chain and noncrystallizable water, behaving as a glassy system.
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Affiliation(s)
- Valerie Samouillan
- Laboratoire de Physique des Polymères, CIRIMAT UMR 5085, Université Paul Sabatier, 31062 Toulouse Cedex 4, France.
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18
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Abstract
Elastin is a key extracellular matrix protein that is critical to the elasticity and resilience of many vertebrate tissues including large arteries, lung, ligament, tendon, skin, and elastic cartilage. Tropoelastin associates with multiple tropoelastin molecules during the major phase of elastogenesis through coacervation, where this process is directed by the precise patterning of mostly alternating hydrophobic and hydrophilic sequences that dictate intermolecular alignment. Massively crosslinked arrays of tropoelastin (typically in association with microfibrils) contribute to tissue structural integrity and biomechanics through persistent flexibility, allowing for repeated stretch and relaxation cycles that critically depend on hydrated environments. Elastin sequences interact with multiple proteins found in or colocalized with microfibrils, and bind to elastogenic cell surface receptors. Knowledge of the major stages in elastin assembly has facilitated the construction of in vitro models of elastogenesis, leading to the identification of precise molecular regions that are critical to elastin-based protein interactions.
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Affiliation(s)
- Suzanne M Mithieux
- School of Molecular and Microbial Biosciences, University of Sydney, New South Wales 2006, Australia
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Mithieux SM, Rasko JEJ, Weiss AS. Synthetic elastin hydrogels derived from massive elastic assemblies of self-organized human protein monomers. Biomaterials 2004; 25:4921-7. [PMID: 15109852 DOI: 10.1016/j.biomaterials.2004.01.055] [Citation(s) in RCA: 152] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2004] [Accepted: 01/26/2004] [Indexed: 11/29/2022]
Abstract
A key objective of bioengineering is the development of new scaffolding biomaterials with appropriate mechanical and biological properties such as strength, elasticity and biocompatibility that mimic the native host connective tissue. Here we describe the production and properties of massive synthetic elastin assemblies formed by chemically cross-linking recombinant human tropoelastin with bis(sulfosuccinimidyl) suberate, permitting the construction of elastic sponges, sheets and tubes. The innate characteristics of synthetic elastin constructs are common with those of native elastin. The Young's Modulus ranged from 220 to 280 kPa with linearity of extension to at least 150%. Synthetic elastin was extensible by 200-370%. The constructs behaved as hydrogels and displayed stimuli-responsive characteristics towards temperature and salt concentrations. Intrinsic fluorescence spectroscopy demonstrated that the elastin fluorophore is a feature of the polypeptide. Scanning electron microscopy allowed us to construct a model of elastin assembly that was driven by the lateral association of small twisted rope-like fibrils. FT-Raman spectra at 100% strain gave amide I and III peaks that correlated with a stretch-dependent increase in alpha-helical content. Growth and proliferation of cells were supported in vitro while in vivo implants were well tolerated. We conclude that synthetic elastin has potential as a novel biomaterial that can be easily molded into a variety of shaped tissue substrates and has a range of properties that are required for elastic, cell-interacting and compliant applications. Furthermore, its in vitro construction provides a powerful tool to probe the early stages of elastin assembly and the molecular basis for its elasticity.
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Affiliation(s)
- Suzanne M Mithieux
- Molecular Biosciences, University of Sydney, Building G08, Sydney, NSW 2006, Australia
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Flamia R, Zhdan PA, Martino M, Castle JE, Tamburro AM. AFM Study of the Elastin-like Biopolymer Poly(ValGlyGlyValGly). Biomacromolecules 2004; 5:1511-8. [PMID: 15244472 DOI: 10.1021/bm049930r] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In this paper, we report an AFM study on the supramolecular structures adopted by the synthetic polypentapeptide poly(ValGlyGlyValGly), whose monomeric sequence is an abundant, simple building block of elastin. The polypeptide was analyzed by deposition from both methanolic and aqueous suspensions, showing different behaviors. In methanol, the polypeptide is able to evolve, in a time-dependent way, from layers to ribbons to beaded filaments. When the equilibrium is reached, the formation of well-defined dendritic structures is also observed. This restructuring of the polypentapeptide seems to be reminiscent of a sort of Rayleigh instability. When deposited from aqueous suspensions, the polypeptide self-assembles either in fibrillar networks or in amyloid-like patterns, both of them being found in elastin or elastin-related polypeptides. As a general finding, poly(ValGlyGlyValGly) seems to constitute an excellent mimetic of the supramolecular properties of native elastin.
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Affiliation(s)
- R Flamia
- Dipartimento di Chimica, Università della Basilicata, via N. Sauro 85, 85100 Potenza, Italy
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