1
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Hohmann T, Chowdhary S, Ataka K, Er J, Dreyhsig GH, Heberle J, Koksch B. Introducing Aliphatic Fluoropeptides: Perspectives on Folding Properties, Membrane Partition and Proteolytic Stability. Chemistry 2023; 29:e202203860. [PMID: 36722398 DOI: 10.1002/chem.202203860] [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: 12/09/2022] [Revised: 01/30/2023] [Accepted: 01/31/2023] [Indexed: 02/02/2023]
Abstract
A de novo designed class of peptide-based fluoropolymers composed of fluorinated aliphatic amino acids as main components is reported. Structural characterization provided insights into fluorine-induced alterations on β-strand to α-helix transition upon an increase in SDS content and revealed the unique formation of PPII structures for trifluorinated fluoropeptides. A combination of circular dichroism, fluorescence-based leaking assays and surface enhanced infrared absorption spectroscopy served to examine the insertion and folding processes into unilamellar vesicles. While partitioning into lipid bilayers, the degree of fluorination conducts a decrease in α-helical content. Furthermore, this study comprises a report on the proteolytic stability of peptides exclusively built up by fluorinated amino acids and proved all sequences to be enzymatically degradable despite the degree of fluorination. Herein presented fluoropeptides as well as the distinctive properties of these artificial and polyfluorinated foldamers with enzyme-degradable features will play a crucial role in the future development of fluorinated peptide-based biomaterials.
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Affiliation(s)
- Thomas Hohmann
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
| | - Suvrat Chowdhary
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
| | - Kenichi Ataka
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Jasmin Er
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
| | - Gesa Heather Dreyhsig
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
| | - Joachim Heberle
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195, Berlin, Germany
| | - Beate Koksch
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195, Berlin, Germany
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2
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Chowdhary S, Schmidt RF, Sahoo AK, Tom Dieck T, Hohmann T, Schade B, Brademann-Jock K, Thünemann AF, Netz RR, Gradzielski M, Koksch B. Rational design of amphiphilic fluorinated peptides: evaluation of self-assembly properties and hydrogel formation. NANOSCALE 2022; 14:10176-10189. [PMID: 35796261 DOI: 10.1039/d2nr01648f] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Advanced peptide-based nanomaterials composed of self-assembling peptides (SAPs) are of emerging interest in pharmaceutical and biomedical applications. The introduction of fluorine into peptides, in fact, offers unique opportunities to tune their biophysical properties and intermolecular interactions. In particular, the degree of fluorination plays a crucial role in peptide engineering as it can be used to control the characteristics of fluorine-specific interactions and, thus, peptide conformation and self-assembly. Here, we designed and explored a series of amphipathic peptides by incorporating the fluorinated amino acids (2S)-4-monofluoroethylglycine (MfeGly), (2S)-4,4-difluoroethylglycine (DfeGly) and (2S)-4,4,4-trifluoroethylglycine (TfeGly) as hydrophobic components. This approach enabled studying the impact of fluorination on secondary structure formation and peptide self-assembly on a systematic basis. We show that the interplay between polarity and hydrophobicity, both induced differentially by varying degrees of side chain fluorination, does affect peptide folding significantly. A greater degree of fluorination promotes peptide fibrillation and subsequent formation of physical hydrogels in physiological conditions. Molecular simulations revealed the key role played by electrostatically driven intra-chain and inter-chain contact pairs that are modulated by side chain fluorination and give insights into the different self-organization behaviour of selected peptides. Our study provides a systematic report about the distinct features of fluorinated oligomeric peptides with potential applications as peptide-based biomaterials.
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Affiliation(s)
- Suvrat Chowdhary
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195 Berlin, Germany.
| | - Robert Franz Schmidt
- Institute of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Anil Kumar Sahoo
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
- Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany
| | - Tiemo Tom Dieck
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195 Berlin, Germany.
| | - Thomas Hohmann
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195 Berlin, Germany.
| | - Boris Schade
- Institute of Chemistry and Biochemistry and Core Facility BioSupraMol, Freie Universität Berlin, Fabeckstraße 36a, 14195 Berlin, Germany
| | - Kerstin Brademann-Jock
- Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Andreas F Thünemann
- Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany
| | - Roland R Netz
- Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Michael Gradzielski
- Institute of Chemistry, Technische Universität Berlin, Straße des 17. Juni 124, 10623 Berlin, Germany
| | - Beate Koksch
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 20, 14195 Berlin, Germany.
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3
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Xiang Y, Zhang J, Mao H, Yan Z, Wang X, Bao C, Zhu L. Highly Tough, Stretchable, and Enzymatically Degradable Hydrogels Modulated by Bioinspired Hydrophobic β-Sheet Peptides. Biomacromolecules 2021; 22:4846-4856. [PMID: 34706536 DOI: 10.1021/acs.biomac.1c01134] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Peptide-based supramolecular hydrogels have attracted great attention due to their good biocompatibility and biodegradability and have become promising candidates for biomedical applications. The bottom-up self-assembly endows the peptides with a highly ordered secondary structure, which has proven to be an effective strategy to improve the mechanical properties of hydrogels through strong physical interactions and energy dissipation. Inspired by the excellent mechanical properties of spider-silk, which can be attributed to the rich β-sheet crystal formation by the hydrophobic peptide fragment, a hydrophobic peptide (HP) that can form a β-sheet assembly was designed and introduced into a poly(vinyl alcohol) (PVA) scaffold to improve mechanical properties of hydrogels by the cooperative intermolecular physical interactions. Compared with hydrogels without peptide grafting (P-HP0), the strong β-sheet self-assembly domain endows the hybrid hydrogels (P-HP20, P-HP29, and P-HP37) with high strength and toughness. The fracture tensile strength increased from 0.3 to 2.1 MPa (7 times), the toughness increased from 0.4 to 21.6 MJ m-3 (54 times), and the compressive strength increased from 0.33 to 10.43 MPa (31 times) at 75% strain. Moreover, the hybrid hydrogels are enzymatically degradable due to the dominant contribution of the β-sheet assembly for network cross-linking. Combining the good biocompatibility and sustained drug release of the constructed hydrogels, this hydrophobic β-sheet peptide represents a promising candidate for the rational design of hydrogels for biomedical applications.
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Affiliation(s)
- Yanxin Xiang
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Jiali Zhang
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Huanv Mao
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Zexin Yan
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Xuebin Wang
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Chunyan Bao
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
| | - Linyong Zhu
- Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, China
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4
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Hesser M, Thursch LJ, Lewis TR, Lima TA, Alvarez NJ, Schweitzer-Stenner R. Concentration Dependence of a Hydrogel Phase Formed by the Deprotonation of the Imidazole Side Chain of Glycylhistidylglycine. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:6935-6946. [PMID: 34077210 DOI: 10.1021/acs.langmuir.1c00382] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Upon deprotonation of its imidazole group at ∼pH 6, the unblocked tripeptide glycylhistidylglycine (GHG) self-assembles into very long crystalline fibrils on a 10-1000 μm scale which are capable of forming a volume spanning network, that is, hydrogel. The critical peptide concentration for self-assembly at a pH of 6 lies between 50 and 60 mM. The fraction of peptides that self-assemble into fibrils depends on the concentration of deprotonated GHG. While IR spectra seem to indicate the formation of fibrils with standard amyloid fibril β-sheet structures, vibrational circular dichroism spectra show a strongly enhanced amide I' signal, suggesting that the formed fibrils exhibit significant chirality. The fibril chirality appears to be a function of peptide concentration. Rheological measurements reveal that the rate of gelation is concentration-dependent and that there is an optimum gel strength at intermediate peptide concentrations of ca. 175 mM. This paper outlines the unique properties of the GHG gel phase which is underlain by a surprisingly dense fibril network with an exceptionally strong modulus that make them potential additives for biomedical applications.
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Affiliation(s)
- Morgan Hesser
- Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Lavenia J Thursch
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Todd R Lewis
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Thamires A Lima
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
| | - Nicolas J Alvarez
- Department of Chemical and Biological Engineering, Drexel University, Philadelphia, Pennsylvania 19104, United States
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5
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Balasco N, Diaferia C, Morelli G, Vitagliano L, Accardo A. Amyloid-Like Aggregation in Diseases and Biomaterials: Osmosis of Structural Information. Front Bioeng Biotechnol 2021; 9:641372. [PMID: 33748087 PMCID: PMC7966729 DOI: 10.3389/fbioe.2021.641372] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 02/05/2021] [Indexed: 11/13/2022] Open
Abstract
The discovery that the polypeptide chain has a remarkable and intrinsic propensity to form amyloid-like aggregates endowed with an extraordinary stability is one of the most relevant breakthroughs of the last decades in both protein/peptide chemistry and structural biology. This observation has fundamental implications, as the formation of these assemblies is systematically associated with the insurgence of severe neurodegenerative diseases. Although the ability of proteins to form aggregates rich in cross-β structure has been highlighted by recent studies of structural biology, the determination of the underlying atomic models has required immense efforts and inventiveness. Interestingly, the progressive molecular and structural characterization of these assemblies has opened new perspectives in apparently unrelated fields. Indeed, the self-assembling through the cross-β structure has been exploited to generate innovative biomaterials endowed with promising mechanical and spectroscopic properties. Therefore, this structural motif has become the fil rouge connecting these diversified research areas. In the present review, we report a chronological recapitulation, also performing a survey of the structural content of the Protein Data Bank, of the milestones achieved over the years in the characterization of cross-β assemblies involved in the insurgence of neurodegenerative diseases. A particular emphasis is given to the very recent successful elucidation of amyloid-like aggregates characterized by remarkable molecular and structural complexities. We also review the state of the art of the structural characterization of cross-β based biomaterials by highlighting the benefits of the osmosis of information between these two research areas. Finally, we underline the new promising perspectives that recent successful characterizations of disease-related amyloid-like assemblies can open in the biomaterial field.
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Affiliation(s)
- Nicole Balasco
- Institute of Biostructures and Bioimaging (IBB), CNR, Naples, Italy
| | - Carlo Diaferia
- Department of Pharmacy, Research Centre on Bioactive Peptides (CIRPeB), University of Naples “Federico II”, Naples, Italy
| | - Giancarlo Morelli
- Department of Pharmacy, Research Centre on Bioactive Peptides (CIRPeB), University of Naples “Federico II”, Naples, Italy
| | - Luigi Vitagliano
- Institute of Biostructures and Bioimaging (IBB), CNR, Naples, Italy
| | - Antonella Accardo
- Department of Pharmacy, Research Centre on Bioactive Peptides (CIRPeB), University of Naples “Federico II”, Naples, Italy
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6
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Levine MS, Ghosh M, Hesser M, Hennessy N, DiGuiseppi DM, Adler-Abramovich L, Schweitzer-Stenner R. Formation of peptide-based oligomers in dimethylsulfoxide: identifying the precursor of fibril formation. SOFT MATTER 2020; 16:7860-7868. [PMID: 32761042 DOI: 10.1039/d0sm00035c] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The well-studied dipeptide fluorenylmethyloxycarbonyl-di-phenylalanine (FmocFF) forms a rigid hydrogel upon dissolving in dimethylsulfoxide (DMSO) and dilution in H2O. Here, we explored the pre-aggregation of the peptide in pure DMSO by vibrational spectroscopies, X-ray powder diffraction and dynamic light scattering. Our results show an equilibrium between a dominant population of amorphous oligomers (on a length scale of 2 nm) and a small number of protofibrils/fibrils (on a length scale of 30 nm in the centimolar and of 200 nm in the sub-molar region). To probe the mechanism underlying the formation of these protofilaments, we measured the 1H-NMR, IR and visible Raman spectra of DMSO containing different FmocFF concentrations, ranging between 10 and 300 mM. Our data reveal that interpeptide hydrogen bonding leads to the self-assembly of FmocFF in the centimolar region, while π-π stacking between Fmoc-groups is observed above 100 mM. The high 3J(HNHCα) coupling constant of the N-terminal amide proton indicates that the Fmoc end-cap of the peptide locks the N-terminal residue into a conformational ensemble centered at a φ-value of ca. -120°, which corresponds to a parallel β-sheet type conformation. The 3J(HNHCα) coupling constant of the C-terminal residue is indicative of a polyproline II (pPII)/βt mixture. Our results suggest that the gelation of FmocFF caused by the addition of a small amount of water to DMSO mixtures is facilitated by the formation of disordered protofibrils in pure DMSO.
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Affiliation(s)
- Matthew S Levine
- Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA.
| | - Moumita Ghosh
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, and The Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv 69978, Israel.
| | - Morgan Hesser
- Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA.
| | - Nathan Hennessy
- Department of Chemistry, The University of Sheffield, Brook Hill, Sheffield S3 7HF, United Kingdom
| | - David M DiGuiseppi
- Department of Chemistry, Drexel University, 3141 Chestnut Street, Philadelphia, PA 19104, USA.
| | - Lihi Adler-Abramovich
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, and The Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv 69978, Israel.
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7
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Keiderling TA. Structure of Condensed Phase Peptides: Insights from Vibrational Circular Dichroism and Raman Optical Activity Techniques. Chem Rev 2020; 120:3381-3419. [DOI: 10.1021/acs.chemrev.9b00636] [Citation(s) in RCA: 50] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Timothy A. Keiderling
- Department of Chemistry, University of Illinois at Chicago 845 West Taylor Street m/c 111, Chicago, Illinois 60607-7061, United States
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8
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Cosme PJ, Ye J, Sears S, Wojcikiewicz EP, Terentis AC. Label-Free Confocal Raman Mapping of Transportan in Melanoma Cells. Mol Pharm 2018; 15:851-860. [PMID: 29397737 DOI: 10.1021/acs.molpharmaceut.7b00601] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Cell-penetrating peptides (CPPs) are promising vectors for the intracellular delivery of a variety of membrane-impermeable bioactive compounds. The mechanisms by which CPPs cross the cell membrane, and the effects that CPPs may have on cell function, still remain to be fully clarified. In this work, we employed confocal Raman microscopy (CRM) and atomic force microscopy (AFM) to study the infiltration and physiological effects of the amphipathic CPP transportan (Tp) on the metastatic melanoma cell line SK-Mel-2. CRM enabled the detection of label-free Tp within the cells. Raman maps of live cells revealed rapid entry (within 5 min) and widespread distribution of the peptide throughout the cytoplasm and the presence of the peptide within the nucleus after ∼20 min. Principal component analysis of the CRM data collected from Tp-treated and untreated cells showed that Tp Raman bands were not positively correlated with lipid Raman bands, indicating that Tp entered the cells via a nonendocytic mechanism. Analysis of intracellularly recovered Tp by mass spectrometry showed that Tp remained intact in SK-Mel-2 cells for up to 24 h. The Raman spectroscopic data also showed that, although Tp was predominantly unstructured (random coil) in aqueous solution, it accumulated to high densities within the cells with mostly β-sheet and α-helical structures. AFM was employed to measure the effect of Tp treatment on cell stiffness. These data showed that Tp induced a significant increase in cell stiffness within the first hour of treatment, which was partially abated after 2 h. It is hypothesized that the increase in cell stiffness was the result of cytoskeletal changes triggered by Tp.
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9
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Kurouski D. Advances of Vibrational Circular Dichroism (VCD) in bioanalytical chemistry. A review. Anal Chim Acta 2017; 990:54-66. [PMID: 29029743 PMCID: PMC10389559 DOI: 10.1016/j.aca.2017.08.014] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 08/08/2017] [Accepted: 08/09/2017] [Indexed: 12/26/2022]
Abstract
Vibrational Circular Dichroism (VCD) is a unique and relatively new spectroscopic technique that is capable of determining an absolute configuration of chiral molecules. VCD can be also used to determine structure of large macromolecules. This review highlights the most recent advances of VCD in bioanalytical chemistry. It shows that VCD is capable of unraveling supramolecular organization of peptides, proteins, saccharides, glycerophospholipids, polypeptide microcrystals, as well as amyloid fibrils and DNA. This review also demonstrates how VCD can be utilized to explore molecule-molecule interactions that determine mechanisms of chiral separations in chromatography. It aims to attract attention of scientists from all different research areas demonstrating the strength and capability of this very powerful spectroscopic technique.
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Affiliation(s)
- Dmitry Kurouski
- Department Biochemistry and Biophysics, Texas A&M University, 2128 TAMU, College Station, TX 77843, USA.
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10
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Chatterjee S, Maitra U. In situ formation of luminescent CdSe QDs in a metallohydrogel: a strategy towards synthesis, isolation, storage and re-dispersion of the QDs. NANOSCALE 2017; 9:13820-13827. [PMID: 28891578 DOI: 10.1039/c7nr03758a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A one step, in situ, room temperature synthesis of yellow luminescent CdSe QDs was achieved in a metallohydrogel derived from a facially amphiphilic bile salt, resulting in a QD-gel hybrid. An ordered self-assembly and homogeneous distribution of the CdSe QDs in the hydrogel network was observed from optical and electron micrographs. The different excited state behavior of the CdSe QDs in the hybrid was revealed for the first time using time resolved spectroscopy. We also describe the successful isolation of the photoluminescent CdSe QDs from the gel followed by their re-dispersion in an organic solvent using suitable capping ligands.
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Affiliation(s)
- Sayantan Chatterjee
- Department of Organic Chemistry, Indian Institute of Science, Bangalore, 560012 Karnataka, India.
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11
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Venanzi M, Gatto E, Formaggio F, Toniolo C. The importance of being Aib. Aggregation and self-assembly studies on conformationally constrained oligopeptides. J Pept Sci 2017; 23:104-116. [DOI: 10.1002/psc.2956] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/30/2016] [Accepted: 12/01/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Mariano Venanzi
- Department of Chemical Sciences and Technologies and Centre for Nanoscience, Nanotechnology and Advanced Instrumentation; University of Rome ‘Tor Vergata’; 00133 Rome Italy
| | - Emanuela Gatto
- Department of Chemical Sciences and Technologies and Centre for Nanoscience, Nanotechnology and Advanced Instrumentation; University of Rome ‘Tor Vergata’; 00133 Rome Italy
| | - Fernando Formaggio
- ICB, Padova Unit, CNR, Department of Chemistry; University of Padova; 35131 Padova Italy
| | - Claudio Toniolo
- ICB, Padova Unit, CNR, Department of Chemistry; University of Padova; 35131 Padova Italy
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12
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DiGuiseppi D, Kraus J, Toal SE, Alvarez N, Schweitzer-Stenner R. Investigating the Formation of a Repulsive Hydrogel of a Cationic 16mer Peptide at Low Ionic Strength in Water by Vibrational Spectroscopy and Rheology. J Phys Chem B 2016; 120:10079-10090. [DOI: 10.1021/acs.jpcb.6b07673] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | - Siobhan E. Toal
- Department
of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104, United States
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13
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Kurouski D, Van Duyne RP, Lednev IK. Exploring the structure and formation mechanism of amyloid fibrils by Raman spectroscopy: a review. Analyst 2016; 140:4967-80. [PMID: 26042229 DOI: 10.1039/c5an00342c] [Citation(s) in RCA: 176] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Amyloid fibrils are β-sheet rich protein aggregates that are strongly associated with various neurodegenerative diseases. Raman spectroscopy has been broadly utilized to investigate protein aggregation and amyloid fibril formation and has been shown to be capable of revealing changes in secondary and tertiary structures at all stages of fibrillation. When coupled with atomic force (AFM) and scanning electron (SEM) microscopies, Raman spectroscopy becomes a powerful spectroscopic approach that can investigate the structural organization of amyloid fibril polymorphs. In this review, we discuss the applications of Raman spectroscopy, a unique, label-free and non-destructive technique for the structural characterization of amyloidogenic proteins, prefibrilar oligomers, and mature fibrils.
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Affiliation(s)
- Dmitry Kurouski
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, USA.
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14
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De Leon Rodriguez LM, Hemar Y, Cornish J, Brimble MA. Structure–mechanical property correlations of hydrogel forming β-sheet peptides. Chem Soc Rev 2016; 45:4797-824. [DOI: 10.1039/c5cs00941c] [Citation(s) in RCA: 103] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
This review discusses about β-sheet peptide structure at the molecular level and the bulk mechanical properties of the corresponding hydrogels.
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Affiliation(s)
| | - Yacine Hemar
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
- The Riddet Institute
| | - Jillian Cornish
- Department of Medicine
- The University of Auckland
- Auckland
- New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery
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15
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De Leon-Rodriguez LM, Kamalov M, Hemar Y, Mitra AK, Castelletto V, Hermida-Merino D, Hamley IW, Brimble MA. A peptide hydrogel derived from a fragment of human cardiac troponin C. Chem Commun (Camb) 2016; 52:4056-9. [DOI: 10.1039/c6cc00209a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The human cardiac troponin C peptide fragment H-V9EQLTEEQKNEFKAAFDIFVLGA31-OH self assembles into β-sheets fibrils that further entangle to give a hydrogels.
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Affiliation(s)
| | - Meder Kamalov
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
| | - Yacine Hemar
- School of Chemical Sciences
- The University of Auckland
- Auckland
- New Zealand
| | - Alok K. Mitra
- School of Biological Sciences
- The University of Auckland
- Auckland
- New Zealand
| | | | | | - Ian W. Hamley
- School of Chemistry
- Food Science and Pharmacy
- University of Reading
- Reading
- UK
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16
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Modulating self-assembly behavior of a salt-free peptide amphiphile (PA) and zwitterionic surfactant mixed system. J Colloid Interface Sci 2015; 467:43-50. [PMID: 26773608 DOI: 10.1016/j.jcis.2015.12.005] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 12/01/2015] [Accepted: 12/01/2015] [Indexed: 11/24/2022]
Abstract
A salt-free surfactant system formed by a peptide amphiphile with short headgroup (PA,C16-GK-3) and a zwitterionic surfactant (dodecyldimethylamine oxide, C12DMAO) in water has been systematically investigated. The microstructures and properties of C16-GK-3/C12DMAO mixed system were characterized using a combination of microscopic, scattering and spectroscopic techniques, including transmission electron microscopy (TEM), field emission-scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), Fourier transform infrared (FT-IR), circular dichroism (CD) and rheological measurements. Rich phase transitions have been observed by adjusting the concentration of C16-GK-3. Investigation of the hydrogels of C16-GK-3/C12DMAO with TEM, SEM and AFM showed that all of these hydrogels form nanobelts. The nanobelt formation is performed in a hierarchical manner: β-sheet peptides and C12DMAO first interact each other to form small aggregates, which then arrange themselves to form one dimensional (1D) left-handed ribbons. The ribbons further aggregated into flat and rigid nanobelts. We proposed a mechanism to interpret the self-assembly process according to the specific peptide structure as well as multiple equilibria between the hydrogen bonding interactions between the headgroups of C16-GK-3, between C12DMAO molecules and the headgroups of C16-GK-3, chirality of the amino acid residues and hydrophobic interactions of the alkyl chains.
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17
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Du X, Zhou J, Shi J, Xu B. Supramolecular Hydrogelators and Hydrogels: From Soft Matter to Molecular Biomaterials. Chem Rev 2015; 115:13165-307. [PMID: 26646318 PMCID: PMC4936198 DOI: 10.1021/acs.chemrev.5b00299] [Citation(s) in RCA: 1258] [Impact Index Per Article: 139.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Indexed: 12/19/2022]
Abstract
In this review we intend to provide a relatively comprehensive summary of the work of supramolecular hydrogelators after 2004 and to put emphasis particularly on the applications of supramolecular hydrogels/hydrogelators as molecular biomaterials. After a brief introduction of methods for generating supramolecular hydrogels, we discuss supramolecular hydrogelators on the basis of their categories, such as small organic molecules, coordination complexes, peptides, nucleobases, and saccharides. Following molecular design, we focus on various potential applications of supramolecular hydrogels as molecular biomaterials, classified by their applications in cell cultures, tissue engineering, cell behavior, imaging, and unique applications of hydrogelators. Particularly, we discuss the applications of supramolecular hydrogelators after they form supramolecular assemblies but prior to reaching the critical gelation concentration because this subject is less explored but may hold equally great promise for helping address fundamental questions about the mechanisms or the consequences of the self-assembly of molecules, including low molecular weight ones. Finally, we provide a perspective on supramolecular hydrogelators. We hope that this review will serve as an updated introduction and reference for researchers who are interested in exploring supramolecular hydrogelators as molecular biomaterials for addressing the societal needs at various frontiers.
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Affiliation(s)
- Xuewen Du
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Jie Zhou
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Junfeng Shi
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
| | - Bing Xu
- Department of Chemistry, Brandeis University, 415 South Street, Waltham, Massachusetts 02454, United States
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Kabiri M, Unsworth LD. Application of Isothermal Titration Calorimetry for Characterizing Thermodynamic Parameters of Biomolecular Interactions: Peptide Self-Assembly and Protein Adsorption Case Studies. Biomacromolecules 2014; 15:3463-73. [DOI: 10.1021/bm5004515] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Maryam Kabiri
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2G6, Canada
| | - Larry D. Unsworth
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2G6, Canada
- NanoLife
Group, National Institute for Nanotechnology, National Research Council (Canada), Edmonton, Alberta T6G
2M9,Canada
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19
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Sereda V, Lednev IK. Polarized Raman Spectroscopy of Aligned Insulin Fibrils. JOURNAL OF RAMAN SPECTROSCOPY : JRS 2014; 45:665-671. [PMID: 25316956 PMCID: PMC4194063 DOI: 10.1002/jrs.4523] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Amyloid fibrils are associated with many neurodegenerative diseases. The application of conventional techniques of structural biology, X-ray crystallography and solution NMR, for fibril characterization is limited because of the non-crystalline and insoluble nature of the fibrils. Here, polarized Raman spectroscopy was used to determine the orientation of selected chemical groups in aligned insulin fibrils, specifically of peptide carbonyls. The methodology is solely based on the measurement of the change in Raman scattered intensity as a function of the angle between the incident laser polarization and the aligned fibrils. The order parameters 〈 P2 〉 and 〈 P4 〉 of the orientation distribution function were obtained, and the most probable distribution of C=O group orientation was calculated. The results indicate that the peptides' carbonyl groups are oriented at an angle of 13±5° from the fibril axis, which is in consistent with previously reported qualitative descriptions of an almost parallel orientation of the C=O groups relative to the main fibril axis.
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Affiliation(s)
- Valentin Sereda
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY 12222, USA
| | - Igor K. Lednev
- Department of Chemistry, University at Albany, SUNY, 1400 Washington Avenue, Albany, NY 12222, USA
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20
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Fleming S, Frederix PWJM, Ramos Sasselli I, Hunt NT, Ulijn RV, Tuttle T. Assessing the utility of infrared spectroscopy as a structural diagnostic tool for β-sheets in self-assembling aromatic peptide amphiphiles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:9510-5. [PMID: 23805919 DOI: 10.1021/la400994v] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
β-Sheets are a commonly found structural motif in self-assembling aromatic peptide amphiphiles, and their characteristic "amide I" infrared (IR) absorption bands are routinely used to support the formation of supramolecular structure. In this paper, we assess the utility of IR spectroscopy as a structural diagnostic tool for this class of self-assembling systems. Using 9-fluorene-methyloxycarbonyl dialanine (Fmoc-AA) and the analogous 9-fluorene-methylcarbonyl dialanine (Fmc-AA) as examples, we show that the origin of the band around 1680-1695 cm(-1) in Fourier transform infrared (FTIR) spectra, which was previously assigned to an antiparallel β-sheet conformation, is in fact absorption of the stacked carbamate group in Fmoc-peptides. IR spectra from (13)C-labeled samples support our conclusions. In addition, DFT frequency calculations on small stacks of aromatic peptides help to rationalize these results in terms of the individual vibrational modes.
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Affiliation(s)
- Scott Fleming
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, UK
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22
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Subbalakshmi C, Manorama SV, Nagaraj R. Self-assembly of short peptides composed of only aliphatic amino acids and a combination of aromatic and aliphatic amino acids. J Pept Sci 2012; 18:283-92. [DOI: 10.1002/psc.2395] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 12/17/2011] [Accepted: 12/20/2011] [Indexed: 11/09/2022]
Affiliation(s)
| | - Sunkara V. Manorama
- CSIR-Indian Institute of Chemical Technology; Nanomaterials Laboratory; Uppal Road Hyderabad 500 007 India
| | - Ramakrishnan Nagaraj
- CSIR-Centre for Cellular and Molecular Biology; Uppal Road Hyderabad 500 007 India
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23
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Xu XD, Lin BB, Feng J, Wang Y, Cheng SX, Zhang XZ, Zhuo RX. Biological Glucose Metabolism Regulated Peptide Self-Assembly as a Simple Visual Biosensor for Glucose Detection. Macromol Rapid Commun 2012; 33:426-31. [DOI: 10.1002/marc.201100689] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2011] [Indexed: 11/10/2022]
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24
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Measey TJ, Schweitzer-Stenner R. Vibrational circular dichroism as a probe of fibrillogenesis: the origin of the anomalous intensity enhancement of amyloid-like fibrils. J Am Chem Soc 2010; 133:1066-76. [PMID: 21186804 DOI: 10.1021/ja1089827] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Amyloid fibrils are affiliated with various human pathologies. Knowledge of their molecular architecture is necessary for a detailed understanding of the mechanism of fibril formation. Vibrational circular dichroism (VCD) spectroscopy has recently shown sensitivity to amyloid fibrils [Ma et al. J. Am. Chem. Soc. 2007, 129, 12364 and Measey et al. J. Am. Chem. Soc. 2009, 131, 18218]. In particular, amyloid fibrils give rise to an intensity enhanced signal in the amide I band region of the corresponding VCD spectrum, offering promise of utilizing such a method for probing fibrillogenesis and the chiral structure of fibrils. Herein, we further investigate this phenomenon and demonstrate the use of VCD to probe the fibril formation kinetics of a short alanine-rich peptide. To elucidate the origin of the anomalous VCD intensity enhancement, we use an excitonic coupling model to simulate the VCD spectrum of stacked β-sheets containing one (Ising-like model) and two amide I oscillators per strand, as models for the underlying amyloid-fibril secondary structure. With this simple model, we show that the VCD intensity enhancement of amyloid-like fibrils results from intrasheet and, to a more limited extent, also from intersheet vibrational coupling between stacked β-sheets. The enhancement requires helically twisted sheets and is most pronounced for arrangements with parallel-oriented strands. Both the intersheet distance and the orientation of the amide I transition dipole moments of neighboring sheets are found to modulate the intensity enhancement of the amide I VCD signal. Moreover, our simulations suggest that, depending on the three-dimensional arrangement of the β-strands, the sign of the VCD signal of amyloid-like fibrils can be used to distinguish between right- and left-handed helical twists of parallel-oriented β-sheets. We compare the results of our simulation to experimental spectra of two short peptides, GNNQQNY, the N-terminal peptide fragment of the yeast prion protein Sup35, and an amyloidogenic alanine-rich peptide, AKY8. Our results demonstrate the advantages of using VCD spectroscopy to probe the kinetics of peptide and protein aggregation as well as the chirality of the resulting supramolecular structure.
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Affiliation(s)
- Thomas J Measey
- Department of Chemistry, Drexel University, 3201 Chestnut Street, Philadelphia, Pennsylvania 19104, United States
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25
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Karjalainen EL, Ravi HK, Barth A. Simulation of the amide I absorption of stacked β-sheets. J Phys Chem B 2010; 115:749-57. [PMID: 21174476 DOI: 10.1021/jp109918c] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Aggregated β-sheet structures are associated with amyloid and prion diseases. Techniques capable of revealing detailed structural and dynamical information on β-sheet structure are thus of great biomedical and biophysical interest. In this work, the infrared (IR) amide I spectral characteristics of stacked β-sheets were modeled using the transition dipole coupling model. For a test set of β-sheet stacks, the simulated amide I spectrum was analyzed with respect to the following parameters; intersheet distance, relative rotation of the sheets with respect to each other and the effect of number of sheets stacked. The amide I maximum shifts about 5 cm(-1) to higher wavenumbers when the intersheet distance between two identical β-sheets decreases from 20 to 5 Å. Rotation around the normal of one of the sheets relative to the other results in maximum intersheet coupling near 0° and 180°. Upon of rotation from 0° to 90° at an intersheet distance of 9 Å, the amide I maximum shifts about 3 cm(-1). Tilting of one of the sheets by 30° from the normal results in a shift of the amide I maximum by less than 1 cm(-1). When stacking several β-sheets along the normal, the amide I maximum shifts to higher wavenumbers with increasing stack size. The amide I maximum shifts about 6 cm(-1) when stacking four sheets with an intersheet distance of 9 Å. The study provides an aid in the interpretation of the IR amide I region for experiments involving β-sheets and creates awareness of the many effects that determine the spectrum of β-sheet structures.
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Affiliation(s)
- Eeva-Liisa Karjalainen
- Department of Biochemistry and Biophysics, Arrhenius Laboratories of Natural Sciences, Stockholm University, SE-106 91, Sweden
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26
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Grieshaber SE, Nie T, Yan C, Zhong S, Teller SS, Clifton RJ, Pochan DJ, Kiick KL, Jia X. Assembly Properties of an Alanine-Rich, Lysine-Containing Peptide and the Formation of Peptide/Polymer Hybrid Hydrogels. MACROMOL CHEM PHYS 2010; 212:229-239. [PMID: 21359141 DOI: 10.1002/macp.201000446] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
We are interested in developing peptide/polymer hybrid hydrogels that are chemically diverse and structurally complex. Towards this end, an alanine-based peptide doped with charged lysines with a sequence of (AKA(3)KA)(2) (AK2) was selected from the crosslinking regions of the natural elastin. Pluronic(®) F127, known to self-assemble into defined micellar structures, was employed as the synthetic building blocks. Fundamental investigations on the environmental effects on the secondary structure and assembly properties of AK2 peptide were carried out with or without the F-127 micelles. At a relatively low peptide concentration (~0.5 mg/mL), the F127 micelles are capable of not only increasing the peptide helicity but also stabilizing it against thermal denaturation. At a higher peptide concentration in basic media, the AK2 peptide developed a substantial amount of β-sheet structure that is conducive to the formation of nanofibrils. The fibril formation was confirmed collectively by atomic force microscopy (AFM), small angle neutron scattering (SANS) and transmission electron microscopy (TEM). The assembly kinetics is strongly dependent on solution temperature and pH; an increased temperature and a more basic environment led to faster fibril assembly. The self-assembled nanoscale structures were covalently interlocked via the Michael-type addition reaction between vinyl sulfone-decorated F127 micelles and the lysine amines exposed at the surface of the nanofibers. The crosslinked hybrid hydrogels were viscoelastic, exhibiting an elastic modulus of approximately 17 kPa and a loss tangent of 0.2.
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Affiliation(s)
- Sarah E Grieshaber
- Department of Materials Science and Engineering, Delaware Biotechnology Institute, University of Delaware, Newark DE 19716, USA
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27
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Self-assembly behavior of peptide amphiphiles (PAs) with different length of hydrophobic alkyl tails. Colloids Surf B Biointerfaces 2010; 81:329-35. [DOI: 10.1016/j.colsurfb.2010.07.027] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2010] [Revised: 07/06/2010] [Accepted: 07/09/2010] [Indexed: 11/24/2022]
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28
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Measey TJ, Schweitzer-Stenner R, Sa V, Kornev K. Anomalous Conformational Instability and Hydrogel Formation of a Cationic Class of Self-Assembling Oligopeptides. Macromolecules 2010. [DOI: 10.1021/ma101450b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thomas J. Measey
- Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104
| | | | - Vijoya Sa
- School of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634
| | - Konstantin Kornev
- School of Materials Science and Engineering, Clemson University, Clemson, South Carolina 29634
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29
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Ye J, Fox SA, Cudic M, Rezler EM, Lauer JL, Fields GB, Terentis AC. Determination of penetratin secondary structure in live cells with Raman microscopy. J Am Chem Soc 2010; 132:980-8. [PMID: 20041639 DOI: 10.1021/ja9043196] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Cell penetrating peptides (CPPs) have attracted recent interest as drug delivery tools, although the mechanisms by which CPPs are internalized by cells are not well-defined. Here, we report a new experimental approach for the detection and secondary structure determination of CPPs in live cells using Raman microscopy with heavy isotope labeling of the peptide. As a first demonstration of principle, penetratin, a 16-residue CPP derived from the Antennapedia homeodomain protein of Drosophila, was measured in single, living melanoma cells. Carbon-13 labeling of the Phe residue of penetratin was used to shift the intense aromatic ring-breathing vibrational mode from 1003 to 967 cm(-1), thereby enabling the peptide to be traced in cells. Difference spectroscopy and principal components analysis (PCA) were used independently to resolve the Raman spectrum of the peptide from the background cellular Raman signals. On the basis of the position of the amide I vibrational band in the Raman spectra, the secondary structure of the peptide was found to be mainly random coil and beta-strand in the cytoplasm, and possibly assembling as beta-sheets in the nucleus. The rapid entry and almost uniform cellular distribution of the peptide, as well as the lack of correlation between peptide and lipid Raman signatures, indicated that the mechanism of internalization under the conditions of study was probably nonendocytotic. This experimental approach can be used to study a wide variety of CPPs as well as other classes of peptides in living cells.
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Affiliation(s)
- Jing Ye
- Department of Chemistry and Biochemistry, Florida Atlantic University, Boca Raton, Florida 33431, USA
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30
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Kuciauskas D, Caputo GA. Self-assembly of peptide-porphyrin complexes leads to pH-dependent excitonic coupling. J Phys Chem B 2010; 113:14439-47. [PMID: 19845410 DOI: 10.1021/jp905468y] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Using absorbance, fluorescence, resonance light scattering, and circular dichroism spectroscopy, we studied the self-assembly of the anionic meso-tetra(4-sulfonatophenyl)porphine (TPPS(4)(2-/4-)) and a cationic 22-residue polypeptide. We found that three TPPS(4)(2-/4-) molecules bind to the peptide, which contains nine lysine residues in the primary sequence. In acidic solutions, when the peptide is in the random-coil conformation, TPPS(4)(2-) bound to the peptide forms excitonically coupled J-aggregates. In pH 7.6 solutions, when the peptide secondary structure is partially alpha-helical, the porphyrin-to-peptide binding constants are approximately the same as in acidic solutions (approximately 3 x 10(6) M(-1)), but excitonic interactions between the porphyrins are insignificant. The binding of TPPS(4)(2-/4-) to lysine-containing peptides is cooperative and can be described by the Hill model. Our results show that porphyrin binding can be used to change the secondary structure of peptide-based biomaterials. In addition, binding to peptides could be used to optimize porphyrin intermolecular electronic interactions (exciton coupling), which is relevant for the design of light-harvesting antennas for artificial photosynthesis.
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Affiliation(s)
- Darius Kuciauskas
- Department of Chemistry and Biochemistry, Rowan University, 201 Mullica Hill Road, Glassboro, New Jersey 08028, USA.
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31
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Xu XD, Chen CS, Lu B, Cheng SX, Zhang XZ, Zhuo RX. Coassembly of Oppositely Charged Short Peptides into Well-Defined Supramolecular Hydrogels. J Phys Chem B 2010; 114:2365-72. [DOI: 10.1021/jp9102417] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiao-Ding Xu
- Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
| | - Chang-Sheng Chen
- Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
| | - Bo Lu
- Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
| | - Si-Xue Cheng
- Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
| | - Xian-Zheng Zhang
- Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
| | - Ren-Xi Zhuo
- Key Laboratory of Biomedical Polymers of Ministry of Education & Department of Chemistry, Wuhan University, Wuhan 430072, P. R. China
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32
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Jang S, Yuan JM, Shin J, Measey TJ, Schweitzer-Stenner R, Li FY. Energy Landscapes Associated with the Self-Aggregation of an Alanine-Based Oligopeptide (AAKA)4. J Phys Chem B 2009; 113:6054-61. [DOI: 10.1021/jp809279r] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Soonmin Jang
- Department of Chemistry, Sejong University, Seoul 143-747, Korea, Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, and Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Jian-Min Yuan
- Department of Chemistry, Sejong University, Seoul 143-747, Korea, Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, and Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Jungho Shin
- Department of Chemistry, Sejong University, Seoul 143-747, Korea, Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, and Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Thomas J. Measey
- Department of Chemistry, Sejong University, Seoul 143-747, Korea, Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, and Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Reinhard Schweitzer-Stenner
- Department of Chemistry, Sejong University, Seoul 143-747, Korea, Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, and Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
| | - Feng-Yin Li
- Department of Chemistry, Sejong University, Seoul 143-747, Korea, Department of Physics, Drexel University, Philadelphia, Pennsylvania 19104, Department of Chemistry, Drexel University, Philadelphia, Pennsylvania 19104, and Department of Chemistry, National Chung Hsing University, Taichung, Taiwan 402, R.O.C
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33
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Jin Y, Xu XD, Chen CS, Cheng SX, Zhang XZ, Zhuo RX. Bioactive Amphiphilic Peptide Derivatives with pH Triggered Morphology and Structure. Macromol Rapid Commun 2008. [DOI: 10.1002/marc.200800455] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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34
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Zhao Y, Yokoi H, Tanaka M, Kinoshita T, Tan T. Self-Assembled pH-Responsive Hydrogels Composed of the RATEA16 Peptide. Biomacromolecules 2008; 9:1511-8. [DOI: 10.1021/bm701143g] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ying Zhao
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan; College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China; and Menicon Co., Ltd. 5-1-10, Takamorodai, Kasugai, Aichi 487-0032, Japan
| | - Hidenori Yokoi
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan; College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China; and Menicon Co., Ltd. 5-1-10, Takamorodai, Kasugai, Aichi 487-0032, Japan
| | - Masayoshi Tanaka
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan; College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China; and Menicon Co., Ltd. 5-1-10, Takamorodai, Kasugai, Aichi 487-0032, Japan
| | - Takatoshi Kinoshita
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan; College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China; and Menicon Co., Ltd. 5-1-10, Takamorodai, Kasugai, Aichi 487-0032, Japan
| | - Tianwei Tan
- Department of Materials Science and Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan; College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China; and Menicon Co., Ltd. 5-1-10, Takamorodai, Kasugai, Aichi 487-0032, Japan
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35
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Bradford VJ, Iverson BL. Amyloid-like Behavior in Abiotic, Amphiphilic Foldamers. J Am Chem Soc 2008; 130:1517-24. [DOI: 10.1021/ja0780840] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Valerie J. Bradford
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Texas 78712
| | - Brent L. Iverson
- Department of Chemistry and Biochemistry, The University of Texas at Austin, Texas 78712
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36
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Shao H, Lockman JW, Parquette JR. Coupled Conformational Equilibria in β-Sheet Peptide−Dendron Conjugates. J Am Chem Soc 2007; 129:1884-5. [PMID: 17256863 DOI: 10.1021/ja068154n] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hui Shao
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue Columbus, Ohio 43210, USA
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