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Euliano EM, Pogostin BH, Agrawal A, Yu MH, Baryakova TH, Graf TP, Hartgerink JD, McHugh KJ. A TLR7 Agonist Conjugated to a Nanofibrous Peptide Hydrogel as a Potent Vaccine Adjuvant. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.03.07.583938. [PMID: 38496534 PMCID: PMC10942436 DOI: 10.1101/2024.03.07.583938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
Toll-like receptors (TLRs) recognize pathogen- and damage-associated molecular patterns and, in turn, trigger the release of cytokines and other immunostimulatory molecules. As a result, TLR agonists are increasingly being investigated as vaccine adjuvants, though many of these agonists are small molecules that quickly diffuse away from the vaccination site, limiting their co-localization with antigens and, thus, their effect. Here, the small-molecule TLR7 agonist 1V209 is conjugated to a positively-charged multidomain peptide (MDP) hydrogel, K 2 , which was previously shown to act as an adjuvant promoting humoral immunity. Mixing the 1V209-conjugated K 2 50:50 with the unfunctionalized K 2 produces hydrogels that retain the shear-thinning and self-healing physical properties of the original MDP, while improving the solubility of 1V209 more than 200-fold compared to the unconjugated molecule. When co-delivered with ovalbumin as a model antigen, 1V209-functionalized K 2 produces antigen-specific IgG titers that were statistically similar to alum, the gold standard adjuvant, and a significantly lower ratio of Th2-associated IgG1 to Th1-associated IgG2a than alum, suggesting a more balanced Th1 and Th2 response. Together, these results suggest that K 2 MDP hydrogels functionalized with 1V209 are a promising adjuvant for vaccines against infectious diseases, especially those benefiting from a combined Th1 and Th2 immune response. Table of Contents Activation of toll-like receptors (TLRs) stimulates a signaling cascade to induce an immune response. A TLR7 agonist was conjugated to an injectable peptide hydrogel, which was then used to deliver a model vaccine antigen. This platform produced antibody titers similar to the gold standard adjuvant alum and demonstrated an improved balance between Th1- and Th2-mediated immunity over alum.
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Balasco N, Altamura D, Scognamiglio PL, Sibillano T, Giannini C, Morelli G, Vitagliano L, Accardo A, Diaferia C. Self-Assembled Materials Based on Fully Aromatic Peptides: The Impact of Tryptophan, Tyrosine, and Dopa Residues. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1470-1486. [PMID: 38174846 PMCID: PMC10795196 DOI: 10.1021/acs.langmuir.3c03214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/13/2023] [Accepted: 12/18/2023] [Indexed: 01/05/2024]
Abstract
Peptides are able to self-organize in structural elements including cross-β structures. Taking advantage of this tendency, in the last decades, peptides have been scrutinized as molecular elements for the development of multivalent supramolecular architectures. In this context, different classes of peptides, also with completely aromatic sequences, were proposed. Our previous studies highlighted that the (FY)3 peptide, which alternates hydrophobic phenylalanine and more hydrophilic tyrosine residues, is able to self-assemble, thanks to the formation of both polar and apolar interfaces. It was observed that the replacement of Phe and Tyr residues with other noncoded aromatic amino acids like 2-naphthylalanine (Nal) and Dopa affects the interactions among peptides with consequences on the supramolecular organization. Herein, we have investigated the self-assembling behavior of two novel (FY)3 analogues with Trp and Dopa residues in place of the Phe and Tyr ones, respectively. Additionally, PEGylation of the N-terminus was analyzed too. The supramolecular organization, morphology, and capability to gel were evaluated using complementary techniques, including fluorescence, Fourier transform infrared spectroscopy, and scanning electron microscopy. Structural periodicities along and perpendicular to the fiber axis were detected by grazing incidence wide-angle X-ray scattering. Finally, molecular dynamics studies provided interesting insights into the atomic structure of the cross-β that constitutes the basic motif of the assemblies formed by these novel peptide systems.
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Affiliation(s)
- Nicole Balasco
- Institute
of Molecular Biology and Pathology, CNR, Piazzale Aldo Moro 5, Rome 00185, Italy
| | - Davide Altamura
- Institute
of Crystallography (IC), CNR, Via Amendola 122, Bari 70126, Italy
| | | | - Teresa Sibillano
- Institute
of Crystallography (IC), CNR, Via Amendola 122, Bari 70126, Italy
| | - Cinzia Giannini
- Institute
of Crystallography (IC), CNR, Via Amendola 122, Bari 70126, Italy
| | - Giancarlo Morelli
- Department
of Pharmacy and CIRPeB, Research Centre on Bioactive Peptides “Carlo
Pedone”, University of Naples “Federico
II”, Via Montesano 49, Naples 80131, Italy
| | - Luigi Vitagliano
- Institute
of Biostructures and Bioimaging (IBB), CNR, Via Castellino 111, Naples 80131, Italy
| | - Antonella Accardo
- Department
of Pharmacy and CIRPeB, Research Centre on Bioactive Peptides “Carlo
Pedone”, University of Naples “Federico
II”, Via Montesano 49, Naples 80131, Italy
| | - Carlo Diaferia
- Department
of Pharmacy and CIRPeB, Research Centre on Bioactive Peptides “Carlo
Pedone”, University of Naples “Federico
II”, Via Montesano 49, Naples 80131, Italy
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Orczykowski W, Bieliński DM, Anyszka R, Gozdek T, Klajn K, Celichowski G, Pędzich Z, Wojteczko A. Fly Ash from Lignite Combustion as a Filler for Rubber Mixes-Part II: Chemical Valorisation of Fly Ash. MATERIALS (BASEL, SWITZERLAND) 2022; 15:5979. [PMID: 36079361 PMCID: PMC9456590 DOI: 10.3390/ma15175979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2022] [Revised: 08/23/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
Fly ash (FA) fractions with a particle size of 63 µm < FA < 250 µm obtained by sieve fractionation were used as a partial carbon black (CB) replacement in a rubber mixture based on styrene-butadiene rubber (SBR). In order to improve the interactions at the interface between rubber and fractionated ash, at the stage of preparing the rubber mixtures, two different vinyl silanes were added to the system: Vinyltrimethoxysilane (U-611) or Vinyl-tris (2-methoxy-ethoxy) silane (LUVOMAXX VTMOEO DL50), silane with epoxy groups: 3-(glycidoxypropyl)trimethoxysilane (U-50) or sulfur functionalized silanes: containing sulfide bridges: Bis(triethoxysilylpropyl)polysulfide silane (Si-266) or mercapto groups: Mercaptopropyltrimethoxysilane (Dynaslan MTMO). The conducted research confirmed the effectiveness of silanization with selected functional silanes, from the point of view of improving the processing and operational properties of vulcanizates, in which CB is partially replaced with the finest fractions of fly ash. The silanization generally increased the interaction at the rubber−ash interface, while improving the degree of filler dispersion in the rubber mixture. The results of TGA and FTIR analyses confirmed the presence of silanes chemically bonded to the surface of fly ash particles. SEM tests and determination of the bound rubber (BdR) content show that the introduction of the silanes to the mixture increases the degree of ash dispersion (DI) and the Payne effect, which is the greatest when mercaptosilane was used for modification. The highest increase in torque, which was recorded in the case of rubber mixtures containing sulfur silanes and silane with epoxy groups, may be due to their participation in the vulcanization process, which is confirmed by the results of vulcametric studies. The lowest values of mechanical strength, elongation at break, and the highest hardness of vulcanizates obtained in this case may be the result of the over-crosslinking of the rubber. The addition of sulfur-containing silanes significantly slowed down the vulcanization process, which is particularly visible (up to three times extension of the t90 parameter, compared to mixtures without silane) in the case of Si-266. The addition of silanes, except for Si-266 (with a polysulfide fragment), generally improved the abrasion resistance of vulcanizates. The Dynaslan MTMO silane (with mercapto groups) performs best in this respect. Proper selection of silane for the finest fraction of fly ash in the rubber mixtures tested allows for an increase in the mechanical strength of their vulcanizates from 9.1 to 17 MPa, elongation at break from 290 to 500%, hardness from 68 to 74 °ShA, and reduction in abrasion from 171 to 147 mm3.
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Affiliation(s)
- Wojciech Orczykowski
- BESTGUM POLSKA Ltd., Św. Barbary 3, 97-427 Rogowiec, Poland
- Institute of Polymer & Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Dariusz M. Bieliński
- Institute of Polymer & Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Rafał Anyszka
- Institute of Polymer & Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Tomasz Gozdek
- Institute of Polymer & Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Katarzyna Klajn
- Institute of Polymer & Dye Technology, Lodz University of Technology, Stefanowskiego 16, 90-537 Lodz, Poland
| | - Grzegorz Celichowski
- Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, Pomorska 163, 90-236 Lodz, Poland
| | - Zbigniew Pędzich
- Department of Ceramics and Refractories, AGH University of Science and Technology, Mickiewicza 30, 30-059 Cracow, Poland
| | - Agnieszka Wojteczko
- Department of Ceramics and Refractories, AGH University of Science and Technology, Mickiewicza 30, 30-059 Cracow, Poland
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Skvortsova P, Valiullina Y, Baranova N, Faizullin D, Zuev Y, Ermakova E. Spectroscopic study of antimicrobial peptides: Structure and functional activity. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 264:120273. [PMID: 34425316 DOI: 10.1016/j.saa.2021.120273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/21/2021] [Accepted: 08/07/2021] [Indexed: 06/13/2023]
Abstract
Amphibians are a natural source of a large number of peptides with a wide range of functional activities. Here, a complex of spectroscopic methods including NMR-, FTIR-, CD-, and UV-spectroscopy was applied to characterize the structure and functional activity of megin-1, a peptide isolated from amphibian skin. The three-dimensional structure of two forms of the peptide was determined using solution NMR spectroscopy. Thermodynamic characteristics of the process of peptide transformation from linear to cyclic form were obtained. Antibacterial and antimycotic properties of the peptide, as well as its protease inhibitory activities, were analyzed.
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Affiliation(s)
- Polina Skvortsova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, Kazan 420111, Russian Federation
| | - Yuliya Valiullina
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, Kazan 420111, Russian Federation
| | - Natalia Baranova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, Kazan 420111, Russian Federation
| | - Dzhigangir Faizullin
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, Kazan 420111, Russian Federation
| | - Yuriy Zuev
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, Kazan 420111, Russian Federation
| | - Elena Ermakova
- Kazan Institute of Biochemistry and Biophysics, FRC Kazan Scientific Center of RAS, Lobachevsky Str., 2/31, Kazan 420111, Russian Federation.
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Prykhodko Y, Martin A, Oulyadi H, Kobzar YL, Marais S, Fatyeyeva K. Imidazolium-based protic ionic liquids with perfluorinated anions: Influence of chemical structure on thermal properties. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117782] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Huang RH, Nayeem N, He Y, Morales J, Graham D, Klajn R, Contel M, O'Brien S, Ulijn RV. Self-Complementary Zwitterionic Peptides Direct Nanoparticle Assembly and Enable Enzymatic Selection of Endocytic Pathways. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2104962. [PMID: 34668253 PMCID: PMC9479426 DOI: 10.1002/adma.202104962] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Revised: 09/12/2021] [Indexed: 05/11/2023]
Abstract
Supramolecular self-assembly in biological systems holds promise to convert and amplify disease-specific signals to physical or mechanical signals that can direct cell fate. However, it remains challenging to design physiologically stable self-assembling systems that demonstrate tunable and predictable behavior. Here, the use of zwitterionic tetrapeptide modalities to direct nanoparticle assembly under physiological conditions is reported. The self-assembly of gold nanoparticles can be activated by enzymatic unveiling of surface-bound zwitterionic tetrapeptides through matrix metalloprotease-9 (MMP-9), which is overexpressed by cancer cells. This robust nanoparticle assembly is achieved by multivalent, self-complementary interactions of the zwitterionic tetrapeptides. In cancer cells that overexpress MMP-9, the nanoparticle assembly process occurs near the cell membrane and causes size-induced selection of cellular uptake mechanism, resulting in diminished cell growth. The enzyme responsiveness, and therefore, indirectly, the uptake route of the system can be programmed by customizing the peptide sequence: a simple inversion of the two amino acids at the cleavage site completely inactivates the enzyme responsiveness, self-assembly, and consequently changes the endocytic pathway. This robust self-complementary, zwitterionic peptide design demonstrates the use of enzyme-activated electrostatic side-chain patterns as powerful and customizable peptide modalities to program nanoparticle self-assembly and alter cellular response in biological context.
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Affiliation(s)
- Richard H Huang
- Advanced Science Research Center at The Graduate Center of the City University of New York, 85 Saint Nicholas Terrace, New York, NY, 10031, USA
- Department of Chemistry and Biochemistry, The City College of New York, 1024 Marshak, 160 Convent Avenue, NY, 10031, USA
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
| | - Nazia Nayeem
- Department of Chemistry and Brooklyn College Cancer Center, Brooklyn College, The City University of New York, Brooklyn, NY, 11210, USA
- Ph.D. Program in Biology, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
| | - Ye He
- Advanced Science Research Center at The Graduate Center of the City University of New York, 85 Saint Nicholas Terrace, New York, NY, 10031, USA
- Division of Science, The City College of New York, 160 Convent Avenue, New York, NY, 10031, USA
| | - Jorge Morales
- Division of Science, The City College of New York, 160 Convent Avenue, New York, NY, 10031, USA
| | - Duncan Graham
- Centre of Molecular Nanometrology, WestCHEM, Department of Pure and Applied Chemistry, Technology and Innovation Centre, University of Strathclyde, 99 George Street, Glasgow, G1 1RD, UK
| | - Rafal Klajn
- Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel
| | - Maria Contel
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
- Department of Chemistry and Brooklyn College Cancer Center, Brooklyn College, The City University of New York, Brooklyn, NY, 11210, USA
- Ph.D. Program in Biology, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
| | - Stephen O'Brien
- Department of Chemistry and Biochemistry, The City College of New York, 1024 Marshak, 160 Convent Avenue, NY, 10031, USA
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
| | - Rein V Ulijn
- Advanced Science Research Center at The Graduate Center of the City University of New York, 85 Saint Nicholas Terrace, New York, NY, 10031, USA
- Ph.D. Program in Chemistry, The Graduate Center of the City University of New York, 365 Fifth Avenue, New York, NY, 10016, USA
- Department of Chemistry and Biochemistry, Hunter College, The City University of New York, 695 Park Avenue, New York, NY, 10065, USA
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7
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de Mello LR, Porosk L, Lourenço TC, Garcia BBM, Costa CAR, Han SW, de Souza JS, Langel Ü, da Silva ER. Amyloid-like Self-Assembly of a Hydrophobic Cell-Penetrating Peptide and Its Use as a Carrier for Nucleic Acids. ACS APPLIED BIO MATERIALS 2021; 4:6404-6416. [PMID: 35006917 DOI: 10.1021/acsabm.1c00601] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Cell-penetrating peptides (CPPs) are a topical subject potentially exploitable for creating nanotherapeutics for the delivery of bioactive loads. These compounds are often classified into three major categories according to their physicochemical characteristics: cationic, amphiphilic, and hydrophobic. Among them, the group of hydrophobic CPPs has received increasing attention in recent years due to toxicity concerns posed by highly cationic CPPs. The hexapeptide PFVYLI (P, proline; F, phenylalanine; V, valine; Y, tyrosine; L, leucine; and I, isoleucine), a fragment derived from the C-terminal portion of α1-antitrypsin, is a prototypal example of hydrophobic CPP. This sequence shows reduced cytotoxicity and a capacity of nuclear localization, and its small size readily hints at its suitability as a building block to construct nanostructured materials. In this study, we examine the self-assembling properties of PFVYLI and investigate its ability to form noncovalent complexes with nucleic acids. By using a combination of biophysical tools including synchrotron small-angle X-ray scattering and atomic force microscopy-based infrared spectroscopy, we discovered that this CPP self-assembles into discrete nanofibrils with remarkable amyloidogenic features. Over the course of days, these fibrils coalesce into rodlike crystals that easily reach the micrometer range. Despite lacking cationic residues in the composition, PFVYLI forms noncovalent complexes with nucleic acids that retain β-sheet pairing found in amyloid aggregates. In vitro vectorization experiments performed with double-stranded DNA fragments indicate that complexes promote the internalization of nucleic acids, revealing that tropism toward cell membranes is preserved upon complexation. On the other hand, transfection assays with splice-correction oligonucleotides (SCOs) for luciferase expression show limited bioactivity across a narrow concentration window, suggesting that the propensity to form amyloidogenic aggregates may trigger endosomal entrapment. We anticipate that the findings presented here open perspectives for using this archetypical hydrophobic CPP in the fabrication of nanostructured scaffolds, which potentially integrate properties of amyloids and translocation capabilities of CPPs.
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Affiliation(s)
- Lucas R de Mello
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo 04023-062, Brazil
| | - Ly Porosk
- Institute of Technology, University of Tartu, Tartu 50411, Estonia
| | - Thiago C Lourenço
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo 04023-062, Brazil
| | - Bianca B M Garcia
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo 04023-062, Brazil
| | - Carlos A R Costa
- Laboratório Nacional de Nanotecnologia (LNNano), Centro Nacional de Pesquisa em Energia e Materiais (CNPEM), Campinas 13083-861, Brazil
| | - Sang W Han
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo 04023-062, Brazil
| | - Juliana S de Souza
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210580, Brazil
| | - Ülo Langel
- Institute of Technology, University of Tartu, Tartu 50411, Estonia
- Department of Biochemistry and Biophysics, Stockholm University, Stockholm SE-10691, Sweden
| | - Emerson R da Silva
- Departamento de Biofísica, Universidade Federal de São Paulo, São Paulo 04023-062, Brazil
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The Role of Counter-Ions in Peptides-An Overview. Pharmaceuticals (Basel) 2020; 13:ph13120442. [PMID: 33287352 PMCID: PMC7761850 DOI: 10.3390/ph13120442] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2020] [Revised: 11/29/2020] [Accepted: 12/01/2020] [Indexed: 12/16/2022] Open
Abstract
Peptides and proteins constitute a large group of molecules that play multiple functions in living organisms. In conjunction with their important role in biological processes and advances in chemical approaches of synthesis, the interest in peptide-based drugs is still growing. As the side chains of amino acids can be basic, acidic, or neutral, the peptide drugs often occur in the form of salts with different counter-ions. This review focuses on the role of counter-ions in peptides. To date, over 60 peptide-based drugs have been approved by the FDA. Based on their area of application, biological activity, and results of preliminary tests they are characterized by different counter-ions. Moreover, the impact of counter-ions on structure, physicochemical properties, and drug formulation is analyzed. Additionally, the application of salts as mobile phase additives in chromatographic analyses and analytical techniques is highlighted.
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9
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Fourier-transform infrared spectroscopy for monitoring proteolytic reactions using dry-films treated with trifluoroacetic acid. Sci Rep 2020; 10:7844. [PMID: 32398689 PMCID: PMC7217958 DOI: 10.1038/s41598-020-64583-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2019] [Accepted: 04/16/2020] [Indexed: 12/15/2022] Open
Abstract
In this study we explore the potential of using Fourier-transform infrared (FTIR) spectra of trifluoroacetate-protein and peptide complexes for monitoring proteolytic reactions. The idea of treating dry-films of protein hydrolysates with trifluoroacetic acid (TFA) prior to FTIR analysis is based on the unique properties of TFA. By adding a large excess of TFA to protein hydrolysate samples, the possible protonation sites of the proteins and peptides will be saturated. In addition, TFA has a low boiling point when protonated as well as complex-forming abilities. When forming TFA-treated dry-films of protein hydrolysates, the excess TFA will evaporate and the deprotonated acid (CF3COO−) will interact as a counter ion with the positive charges on the sample materials. In the study, spectral changes in TFA-treated dry-films of protein hydrolysates from a pure protein and poultry by-products, were compared to the FTIR fingerprints of untreated dry-films. The results show that time-dependent information related to proteolytic reactions and, consequently, on the characteristics of the protein hydrolysates can be obtained. With additional developments, FTIR on dry-films treated with TFA may be regarded as a potential future tool for the analysis of all types of proteolytic reactions in the laboratory as well as in industry.
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Begum R, Perriman AW, Su B, Scarpa F, Kafienah W. Chondroinduction of Mesenchymal Stem Cells on Cellulose-Silk Composite Nanofibrous Substrates: The Role of Substrate Elasticity. Front Bioeng Biotechnol 2020; 8:197. [PMID: 32266231 PMCID: PMC7096586 DOI: 10.3389/fbioe.2020.00197] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2019] [Accepted: 02/28/2020] [Indexed: 01/09/2023] Open
Abstract
Smart biomaterials with an inherent capacity to elicit specific behaviors in lieu of biological prompts would be advantageous for regenerative medicine applications. In this work, we employ an electrospinning technique to model the in vivo nanofibrous extracellular matrix (ECM) of cartilage using a chondroinductive cellulose and silk polymer blend (75:25 ratio). This natural polymer composite is directly electrospun for the first time, into nanofibers without post-spun treatment, using a trifluoroacetic acid and acetic acid cosolvent system. Biocompatibility of the composite nanofibres with human mesenchymal stem cells (hMSCs) is demonstrated and its inherent capacity to direct chondrogenic stem cell differentiation, in the absence of stimulating growth factors, is confirmed. This chondrogenic stimulation could be countered biochemically using fibroblast growth factor-2, a growth factor used to enhance the proliferation of hMSCs. Furthermore, the potential mechanisms driving this chondroinduction at the cell-biomaterial interface is investigated. Composite substrates are fabricated as two-dimensional film surfaces and cultured with hMSCs in the presence of chemicals that interfere with their biochemical and mechanical signaling pathways. Preventing substrate surface elasticity transmission resulted in a significant downregulation of chondrogenic gene expression. Interference with the classical chondrogenic Smad2/3 phosphorylation pathway did not impact chondrogenesis. The results highlight the importance of substrate mechanical elasticity on hMSCs chondroinduction and its independence to known chondrogenic biochemical pathways. The newly fabricated scaffolds provide the foundation for designing a robust, self-inductive, and cost-effective biomimetic biomaterial for cartilage tissue engineering.
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Affiliation(s)
- Runa Begum
- Faculty of Biomedical Sciences, School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom
| | - Adam W Perriman
- Faculty of Biomedical Sciences, School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom
| | - Bo Su
- Bristol Dental School, University of Bristol, Bristol, United Kingdom
| | - Fabrizio Scarpa
- Bristol Composites Institute (ACCIS), University of Bristol, Bristol, United Kingdom
| | - Wael Kafienah
- Faculty of Biomedical Sciences, School of Cellular and Molecular Medicine, University of Bristol, Bristol, United Kingdom
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11
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Tarallo V, Iaccarino E, Cicatiello V, Sanna R, Ruvo M, De Falco S. Oral Delivery of a Tetrameric Tripeptide Inhibitor of VEGFR1 Suppresses Pathological Choroid Neovascularization. Int J Mol Sci 2020; 21:ijms21020410. [PMID: 31936463 PMCID: PMC7014271 DOI: 10.3390/ijms21020410] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Revised: 12/30/2019] [Accepted: 01/07/2020] [Indexed: 12/11/2022] Open
Abstract
Age-related macular degeneration (AMD) is the primary cause of blindness in advanced countries. Repeated intravitreal delivery of anti-vascular endothelial growth factor (VEGF) agents has represented an important advancement for the therapy of wet AMD with significative results in terms of blindness prevention and partial vision restore. Nonetheless, some patients are not responsive or do not attain significant visual improvement, intravitreal injection may cause serious complications and important side effects have been reported for the prolonged block of VEGF-A. In order to evaluate new anti-angiogenic strategies, we focused our attention on VEGF receptor 1 (VEGFR1) developing a specific VEGFR-1 antagonist, a tetrameric tripeptide named inhibitor of VEGFR 1 (iVR1). We have evaluated its anti-angiogenic activity in the preclinical model of AMD, the laser-induced choroid neovascularization (CNV). iVR1 is able to potently inhibit CNV when delivered by intravitreal injection. Surprisingly, it is able to significantly reduce CNV also when delivered by gavage. Our data show that the specific block of VEGFR1 in vivo represents a valid alternative to the block of VEGF-A and that the inhibition of the pathological neovascularization at ocular level is also possible by systemic delivery of compounds not targeting VEGF-A.
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Affiliation(s)
- Valeria Tarallo
- Istituto di Genetica e Biofisica ‘Adriano Buzzati-Traverso’—CNR, 80131 Napoli, Italy
| | | | - Valeria Cicatiello
- Istituto di Genetica e Biofisica ‘Adriano Buzzati-Traverso’—CNR, 80131 Napoli, Italy
| | | | - Menotti Ruvo
- Istituto di Biostrutture e Bioimmagini—CNR, 80134 Napoli, Italy
- ANBITION s.r.l., Department of R&D, 80128 Napoli, Italy
| | - Sandro De Falco
- Istituto di Genetica e Biofisica ‘Adriano Buzzati-Traverso’—CNR, 80131 Napoli, Italy
- ANBITION s.r.l., Department of R&D, 80128 Napoli, Italy
- Correspondence: or ; Tel.: +39-081-6132-354
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12
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Delving into the amyloidogenic core of human leukocyte chemotactic factor 2. J Struct Biol 2019; 207:260-269. [PMID: 31170474 DOI: 10.1016/j.jsb.2019.06.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2019] [Revised: 05/31/2019] [Accepted: 06/02/2019] [Indexed: 11/22/2022]
Abstract
ALECT2 (leukocyte chemotactic factor 2) amyloidosis is one of the most recently identified amyloid-related diseases, with LECT2 amyloids commonly found in different types of tissues. Under physiological conditions, LECT2 is a 16 kDa multifunctional protein produced by the hepatocytes and secreted into circulation. The pathological mechanisms causing LECT2 transition into the amyloid state are still largely unknown. In the case of ALECT2 patients, there is no disease-causing mutation, yet almost all patients carry a common polymorphism that appears to be necessary but not sufficient to directly trigger amyloidogenesis. In this work, we followed a reductionist methodology in order to detect critical amyloidogenic "hot-spots" during the fibrillation of LECT2. By associating experimental and computational assays, this approach reveals the explicit amyloidogenic core of human LECT2 and pinpoints regions with distinct amyloidogenic properties. The fibrillar architecture of LECT2 polymers, based on our results, provides a wealth of detailed information about the amyloidogenic "hot-spot" interactions and represents a starting point for future peptide-driven intervention in ALECT2 amyloidosis.
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13
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A Spectroscopic Study of Solid-Phase Chitosan/Cyclodextrin-Based Electrospun Fibers. FIBERS 2019. [DOI: 10.3390/fib7050048] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
In this study, chitosan (chi)/hydroxypropyl-β-cyclodextrin (HPCD) 2:20 and 2:50 Chi:HPCD fibers were assembled via an electrospinning process that contained a mixture of chitosan and HPCD with trifluoroacetic acid (TFA) as a solvent. Complementary thermal analysis (thermal gravimetric analysis (TGA)/differential scanning calorimetry (DSC)) and spectroscopic methods (Raman/IR/NMR) were used to evaluate the structure and composition of the fiber assemblies. This study highlights the multifunctional role of TFA as a solvent, proton donor and electrostatically bound pendant group to chitosan, where the formation of a ternary complex occurs via supramolecular host–guest interactions. This work contributes further insight on the formation and stability of such ternary (chitosan + HPCD + solvent) electrospun fibers and their potential utility as “smart” fiber coatings for advanced applications.
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14
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Huang W, Hao P, Qin J, Luo S, Zhang T, Peng B, Chen H, Zan X. Hexahistidine-metal assemblies: A promising drug delivery system. Acta Biomater 2019; 90:441-452. [PMID: 30953803 DOI: 10.1016/j.actbio.2019.03.058] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 03/23/2019] [Accepted: 03/29/2019] [Indexed: 10/27/2022]
Abstract
It is of considerable interest to construct an ideal drug delivery system (i.e., high drug payload, minimal cytotoxicity, rapid endocytosis, and lysosomal escape) under mild conditions for disease treatment, tissue engineering, bioimaging, etc. Inspired by the coordinative interactions between histidine and metal ions, we present the facile synthesis of hexahistidine (His6)-metal assembly (HmA) particles under mild conditions for the first time. The HmA particles presented a high loading capacity, a wide variety of loadable drugs, minimal cytotoxicity, quick internalization, the ability to bypass the lysosomes, and rapid intracellular drug release. In addition, HmA encapsulation largely improved the antitumor ability of camptothecin (CPT) relative to free CPT. By capitalizing on these promising features in drug delivery, HmA will have great potential in various biomedical fields. STATEMENT OF SIGNIFICANCE: It is of considerable interest to construct an ideal drug delivery system (i.e., high drug payload, minimal cytotoxicity, rapid endocytosis, and lysosomal escape) under mild conditions. Inspired by the coordinative interactions between histidine and metal ions, we present for the first time the facile synthesis of Hexahistidine (His6)-metal assembly (HmA) particles under mild conditions. The HmA particles exhibited a high loading capacity, a wide variety of loadable drugs, minimal cytotoxicity, quick internalization, the ability to bypass the lysosomes, and rapid intracellular drug release. By capitalizing on these promising features in drug delivery, HmA will have great potential in various biomedical fields.
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15
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Mello LR, Hamley IW, Miranda A, Alves WA, Silva ER. β
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sheet assembly in amyloidogenic glutamic acid nanostructures: Insights from X‐ray scattering and infrared nanospectroscopy. J Pept Sci 2019; 25:e3170. [DOI: 10.1002/psc.3170] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2019] [Revised: 03/06/2019] [Accepted: 03/12/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Lucas R. Mello
- Departamento de BiofísicaUniversidade Federal de São Paulo São Paulo Brazil
| | - Ian W. Hamley
- Department of ChemistryUniversity of Reading Reading UK
| | - Antonio Miranda
- Departamento de BiofísicaUniversidade Federal de São Paulo São Paulo Brazil
| | - Wendel A. Alves
- Centro de Ciências Naturais e HumanasUniversidade Federal do ABC Santo André Brazil
| | - Emerson R. Silva
- Departamento de BiofísicaUniversidade Federal de São Paulo São Paulo Brazil
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16
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Jakubek RS, White SE, Asher SA. UV Resonance Raman Structural Characterization of an (In)soluble Polyglutamine Peptide. J Phys Chem B 2019; 123:1749-1763. [PMID: 30717595 DOI: 10.1021/acs.jpcb.8b10783] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Fibrillization of polyglutamine (polyQ) tracts in proteins is implicated in at least 10 neurodegenerative diseases. This generates great interest in the structure and the aggregation mechanism(s) of polyQ peptides. The fibrillization of polyQ is thought to result from the peptide's insolubility in aqueous solutions; longer polyQ tracts show decreased aqueous solution solubility, which is thought to lead to faster fibrillization kinetics. However, few studies have characterized the structure(s) of polyQ peptides with low solubility. In the work here, we use UV resonance Raman spectroscopy to examine the secondary structures, backbone hydrogen bonding, and side chain hydrogen bonding for a variety of solution-state, solid, and fibril forms of D2Q20K2 (Q20). Q20 is insoluble in water and has a β-strand-like conformation with extensive inter- and intrapeptide hydrogen bonding in both dry and aqueous environments. We find that Q20 has weaker backbone-backbone and backbone-side chain hydrogen bonding and is less ordered compared to that of polyQ fibrils. Interestingly, we find that the insoluble Q20 will form fibrils when incubated in water at room temperature for ∼5 h. Also, Q20 can be prepared using a well-known disaggregation procedure to produce a water-soluble PPII-like conformation with negligible inter- and intrapeptide hydrogen bonding and a resistance to aggregation.
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17
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Tsiolaki PL, Nasi GI, Baltoumas FA, Louros NN, Magafa V, Hamodrakas SJ, Iconomidou VA. αCGRP, another amyloidogenic member of the CGRP family. J Struct Biol 2018; 203:27-36. [PMID: 29501724 DOI: 10.1016/j.jsb.2018.02.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 01/26/2018] [Accepted: 02/28/2018] [Indexed: 10/17/2022]
Abstract
The Calcitonin-gene related peptide (CGRP) family is a group of peptide hormones, which consists of IAPP, calcitonin, adrenomedullin, intermedin, αCGRP and βCGRP. IAPP and calcitonin have been extensively associated with the formation of amyloid fibrils, causing Type 2 Diabetes and Medullary Thyroid Carcinoma, respectively. In contrast, the potential amyloidogenic properties of αCGRP still remain unexplored, although experimental trials have indicated its presence in deposits, associated with the aforementioned disorders. Therefore, in this work, we investigated the amyloidogenic profile of αCGRP, a 37-residue-long peptide hormone, utilizing both biophysical experimental techniques and Molecular Dynamics simulations. These efforts unravel a novel amyloidogenic member of the CGRP family and provide insights into the mechanism underlying the αCGRP polymerization.
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Affiliation(s)
- Paraskevi L Tsiolaki
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Georgia I Nasi
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Fotis A Baltoumas
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Nikolaos N Louros
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Vassiliki Magafa
- Department of Pharmacy, University of Patras, Patras 26504, Greece.
| | - Stavros J Hamodrakas
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
| | - Vassiliki A Iconomidou
- Section of Cell Biology and Biophysics, Department of Biology, School of Sciences, National and Kapodistrian University of Athens, Panepistimiopolis, Athens 157 01, Greece.
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18
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Rodríguez Nassif A, de la Arada I, Arrondo JL, Pastrana-Rios B. 2D IR Correlation Spectroscopy in the Determination of Aggregation and Stability of KH Domain GXXG Loop Peptide in the Presence and Absence of Trifluoroacetate. Anal Chem 2017; 89:5765-5775. [PMID: 28459550 DOI: 10.1021/acs.analchem.6b04800] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Trifluoroacetate (TFA) is a strong anion byproduct of solid-phase peptide synthesis. Fourier transform infrared (FT-IR) spectroscopy can be used to ascertain the presence of this excipient in peptide samples for quality assessment. TFA absorbs as a strong sharp peak (1675 cm-1) within the amide I' band of the spectral region. A peptide sample and the TFA excipient can be studied simultaneously by FT-IR and 2D IR correlation spectroscopies. In addition, these techniques are able to determine the effect of TFA on the stability of the peptide. Herein, we describe the spectroscopic characterization of the GXXG loop peptide (GXXGlp), which is present in KH domain containing proteins. The sequence of the Homo sapiens Krr1 GXXGlp is evolutionarily conserved (165KRRQRLIGPKGSTLKALELLTNCY189) and has been associated with ssDNA interaction and ribosome biogenesis. Our goal was to determine the structural elements present in this peptide and evaluate whether TFA affects the stability of GXXGlp during thermal stress. We observed differences in the molecular behavior of the synthetic peptide in the presence and absence of TFA at various peptide concentrations. Finally, 2D IR correlation spectroscopy was used for the determination of the unfolding process, mechanism and extent of peptide aggregation, and the effect of TFA on the stability of the peptide. This spectroscopic method can be applied to the characterization of any synthetic peptide.
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Affiliation(s)
- Aslin Rodríguez Nassif
- Department of Chemistry, University of Puerto Rico , Mayagüez Campus, Mayagüez, Puerto Rico 00681-9019, United States
| | - Igor de la Arada
- Biofisika Institute and Biochemistry and Molecular Biology Department, CSIC and University of Basque Country , Bilbao, 48080, Spain
| | - José Luis Arrondo
- Biofisika Institute and Biochemistry and Molecular Biology Department, CSIC and University of Basque Country , Bilbao, 48080, Spain
| | - Belinda Pastrana-Rios
- Department of Chemistry, University of Puerto Rico , Mayagüez Campus, Mayagüez, Puerto Rico 00681-9019, United States.,Protein Research Center, University of Puerto Rico , Mayagüez Campus, Mayagüez, Puerto Rico 00681-9019, United States
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19
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Exploring the ‘aggregation-prone’ core of human Cystatin C: A structural study. J Struct Biol 2015; 191:272-80. [DOI: 10.1016/j.jsb.2015.07.013] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2015] [Revised: 07/21/2015] [Accepted: 07/30/2015] [Indexed: 12/16/2022]
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20
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Li S, Combs JD, Alharbi OE, Kong J, Wang C, Leblanc RM. The (13)C amide I band is still sensitive to conformation change when the regular amide I band cannot be distinguished at the typical position in H2O. Chem Commun (Camb) 2015; 51:12537-9. [PMID: 26153570 DOI: 10.1039/c5cc02263k] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The attenuated total reflection technique was utilized to obtain FTIR spectra of (13)C-labeled peptides with a sequence of (AAAAK)4AAAAY in H2O. The regular amide I band was not at the typical position as reported in globular proteins, whereas the (13)C amide I band was still sensitive to conformation change.
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Affiliation(s)
- Shanghao Li
- Department of Chemistry, University of Miami, 1301 Memorial Drive, Coral Gables, FL 33146, USA.
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21
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Matsumoto K, Shundo A, Ohno M, Fujita S, Saruhashi K, Miyachi N, Miyaji K, Tanaka K. Modulation of physical properties of supramolecular hydrogels based on a hydrophobic core. Phys Chem Chem Phys 2015; 17:2192-8. [DOI: 10.1039/c4cp04395b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
We demonstrate herein the variation in viscoelastic properties of supramolecular hydrogels (SMG) composed of two amphiphiles, N-Palmitoyl-Gly-His (PalGH) and sodium palmitate (PalNa).
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Affiliation(s)
- Keigo Matsumoto
- Department of Automotive Science
- Kyushu University
- Fukuoka 819-0395
- Japan
- Nissan Chemical Industries, Ltd
| | - Atsuomi Shundo
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395
- Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
| | - Masashi Ohno
- Nissan Chemical Industries, Ltd
- Tokyo 101-0054
- Japan
| | - Shun Fujita
- Nissan Chemical Industries, Ltd
- Tokyo 101-0054
- Japan
| | | | | | | | - Keiji Tanaka
- Department of Automotive Science
- Kyushu University
- Fukuoka 819-0395
- Japan
- Department of Applied Chemistry
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22
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Tsiolaki PL, Hamodrakas SJ, Iconomidou VA. The pentapeptide LQVVR plays a pivotal role in human cystatin C fibrillization. FEBS Lett 2014; 589:159-64. [DOI: 10.1016/j.febslet.2014.11.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 11/10/2014] [Accepted: 11/19/2014] [Indexed: 02/03/2023]
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23
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Weng Z, Zhang SH, Wang W, Guo JJ, Hai H. Syntheses, Structures and Properties of Three New Trinuclear Nickel Clusters with (2-Hydroxy-4-methoxyphenyl)-phenyl-methanone. J CLUST SCI 2014. [DOI: 10.1007/s10876-014-0802-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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24
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Xiao Y, Huang P, Wang W. Ligand Structure Induced Diversification from Dinuclear to 1D Chain Compounds: Syntheses, Structures and Fluorescence Properties. J CLUST SCI 2014. [DOI: 10.1007/s10876-014-0799-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Synthesis, Structure and Properties of Linear Trinuclear Cobalt Cluster with 5-Fluoro-2-hydroxy-benzoic Acid. J CLUST SCI 2014. [DOI: 10.1007/s10876-014-0758-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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26
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Witkowska J, Karpowicz P, Gaczynska M, Osmulski PA, Jankowska E. Dissecting a role of a charge and conformation of Tat2 peptide in allosteric regulation of 20S proteasome. J Pept Sci 2014; 20:649-56. [PMID: 24819612 DOI: 10.1002/psc.2642] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 03/24/2014] [Accepted: 03/31/2014] [Indexed: 12/11/2022]
Abstract
Proteasome is a 'proteolytic factory' that constitutes an essential part of the ubiquitin-proteasome pathway. The involvement of proteasome in regulation of all major aspects of cellular physiology makes it an attractive drug target. So far, only inhibitors of the proteasome entered the clinic as anti-cancer drugs. However, proteasome regulators may also be useful for treatment of inflammatory and neurodegenerative diseases. We established in our previous studies that the peptide Tat2, comprising the basic domain of HIV-1 Tat protein: R(49) KKRRQRR(56) , supplemented with Q(66) DPI(69) fragment, inhibits the 20S proteasome in a noncompetitive manner. Mechanism of Tat2 likely involves allosteric regulation because it competes with the proteasome natural 11S activator for binding to the enzyme noncatalytic subunits. In this study, we performed alanine walking coupled with biological activity measurements and FTIR and CD spectroscopy to dissect contribution of a charge and conformation of Tat2 to its capability to influence peptidase activity of the proteasome. In solution, Tat2 and most of its analogs with a single Ala substitution preferentially adopted a conformation containing PPII/turn structural motifs. Replacing either Asp10 or two or more adjacent Arg/Lys residues induced a random coil conformation, probably by disrupting ionic interactions responsible for stabilization of the peptides ordered structure. The random coil Tat2 analogs lost their capability to activate the latent 20S proteasome. In contrast, inhibitory properties of the peptides more significantly depended on their positive charge. The data provide valuable clues for the future optimization of the Tat2-based proteasome regulators.
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Affiliation(s)
- Julia Witkowska
- Department of Medicinal Chemistry, Faculty of Chemistry, University of Gdańsk, Wita Stwosza 63, 80-308, Gdańsk, Poland
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27
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Shundo A, Hoshino Y, Higuchi T, Matsumoto Y, Penaloza Jr DP, Matsumoto K, Ohno M, Miyaji K, Goto M, Tanaka K. Facile microcapsule fabrication by spray deposition of a supramolecular hydrogel. RSC Adv 2014. [DOI: 10.1039/c4ra04636f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
When a supramolecular hydrogel, that was based on the self-assembly of low-molecular-weight molecules, was sprayed onto a solid substrate, the resultant residue after drying off the water contained microcapsules composed of the fibrils.
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Affiliation(s)
- Atsuomi Shundo
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
- Kyushu University
| | - Yuuki Hoshino
- Department of Automotive Science
- Kyushu University
- Fukuoka 819-0395, Japan
| | - Takahiro Higuchi
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395, Japan
| | - Yuji Matsumoto
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395, Japan
| | | | - Keigo Matsumoto
- Department of Automotive Science
- Kyushu University
- Fukuoka 819-0395, Japan
- Nissan Chemical Industries, Ltd
- Tokyo 101-0054, Japan
| | - Masashi Ohno
- Nissan Chemical Industries, Ltd
- Tokyo 101-0054, Japan
| | | | - Masahiro Goto
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395, Japan
- Center for Future Chemistry
- Kyushu University
| | - Keiji Tanaka
- Department of Applied Chemistry
- Kyushu University
- Fukuoka 819-0395, Japan
- International Institute for Carbon-Neutral Energy Research (WPI-I2CNER)
- Kyushu University
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28
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Li S, Potana S, Keith DJ, Wang C, Leblanc RM. Isotope-edited FTIR in H2O: determination of the conformation of specific residues in a model α-helix peptide by 13C labeled carbonyls. Chem Commun (Camb) 2014; 50:3931-3. [DOI: 10.1039/c4cc00991f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Palmieri LC, Melo-Ferreira B, Braga CA, Fontes GN, Mattos LJ, Lima LMT. Stepwise oligomerization of murine amylin and assembly of amyloid fibrils. Biophys Chem 2013; 180-181:135-44. [DOI: 10.1016/j.bpc.2013.07.013] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 07/26/2013] [Accepted: 07/27/2013] [Indexed: 01/15/2023]
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30
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Shundo A, Penaloza DP, Tanaka K. Microscopic heterogeneity in viscoelastic properties of molecular assembled systems. CHINESE JOURNAL OF POLYMER SCIENCE 2012. [DOI: 10.1007/s10118-013-1193-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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31
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Iconomidou VA, Pheida D, Hamodraka ES, Antony C, Hoenger A, Hamodrakas SJ. An amyloidogenic determinant in n-terminal pro-brain natriuretic peptide (nt-probnp): Implications for cardiac amyloidoses. Biopolymers 2011; 98:67-75. [DOI: 10.1002/bip.21698] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2011] [Revised: 05/23/2011] [Accepted: 07/06/2011] [Indexed: 11/11/2022]
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32
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Gregor CR, Cerasoli E, Schouten J, Ravi J, Slootstra J, Horgan A, Martyna GJ, Ryadnov MG, Davis P, Crain J. Antibody recognition of a human chorionic gonadotropin epitope (hCGbeta66-80) depends on local structure retained in the free peptide. J Biol Chem 2011; 286:25016-26. [PMID: 21592960 DOI: 10.1074/jbc.m111.246637] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Human chorionic gonadotropin (hCG) is an important biomarker in pregnancy and oncology, where it is routinely detected and quantified by specific immunoassays. Intelligent epitope selection is essential to achieving the required assay performance. We present binding affinity measurements demonstrating that a typical β3-loop-specific monoclonal antibody (8G5) is highly selective in competitive immunoassays and distinguishes between hCGβ(66-80) and the closely related luteinizing hormone (LH) fragment LHβ(86-100), which differ only by a single amino acid residue. A combination of optical spectroscopic measurements and atomistic computer simulations on these free peptides reveals differences in turn type stabilized by specific hydrogen bonding motifs. We propose that these structural differences are the basis for the observed selectivity in the full protein.
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Affiliation(s)
- Craig R Gregor
- School of Physics, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JZ, Scotland, United Kingdom
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33
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Koch K, Afonin S, Ieronimo M, Berditsch M, Ulrich AS. Solid-State 19F-NMR of Peptides in Native Membranes. Top Curr Chem (Cham) 2011; 306:89-118. [DOI: 10.1007/128_2011_162] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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