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Xing J, Zhang S, Zhang M, Lin S. Analysis of α-helix unfolding in the pine nut peptide Lys-Cys-His-Lys-Pro induced by pulsed electric field. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:4058-4065. [PMID: 28199023 DOI: 10.1002/jsfa.8273] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Revised: 02/07/2017] [Accepted: 02/11/2017] [Indexed: 06/06/2023]
Abstract
BACKGROUND A variety of analytical techniques were applied to explore the effects of pulsed electric field (PEF) on α-helix structural changes in the novel antioxidant peptide Lys-Cys-His-Lys-Pro (KCHKP, 611.76 Da). RESULTS The relative α-helix content of the KCHKP peptide was significantly altered from 100% to 89.91 ± 0.97% when the electric pulse frequency was 1800 Hz and the field intensity was 10 kV cm-1 . Moreover, the 1,1-diphenyl-2-pycryl-hydrazyl (DPPH) and 2,2-azinobis diammonium salt (ABTS) radical-scavenging activities of PEF-treated KCHKP were increased from 56.31% ± 0.74% to 84.33% ± 1.23% and from 40.56% ± 0.78% to 51.33% ± 0.27%, respectively. CONCLUSION PEF treatment increased peptide linkage stretch vibration and altered hydrogen bonding of KCHKP. The stability of the α-helix structure was influenced by hydrogen bonds within the peptide linkage of KCHKP induced by PEF and was related to changes in antioxidant activity. © 2017 Society of Chemical Industry.
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Affiliation(s)
- Jie Xing
- College of Food Science and Engineering, Jilin University, Changchun, PR China
| | - Sitian Zhang
- College of Food Science and Engineering, Jilin University, Changchun, PR China
| | - Mingdi Zhang
- College of Food Science and Engineering, Jilin University, Changchun, PR China
| | - Songyi Lin
- College of Food Science and Engineering, Jilin University, Changchun, PR China
- School of Food Science and Technology, Dalian Polytechnic University, Engineering Research Center of Seafood of Ministry of Education, Dalian, PR China
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Abstract
Pre-mRNA processing protein 40 (Prp40) is a nuclear protein that has a role in pre-mRNA splicing. Prp40 possesses two leucine-rich nuclear export signals, but little is known about the function of Prp40 in the export process. Another protein that has a role in protein export is centrin, a member of the EF-hand superfamily of Ca2+-binding proteins. Prp40 was found to be a centrin target by yeast-two-hybrid screening using both Homo sapiens centrin 2 (Hscen2) and Chlamydomonas reinhardtii centrin (Crcen). We identified a centrin-binding site within H. sapiens Prp40 homolog A (HsPrp40A), which contains a hydrophobic triad W1L4L8 that is known to be important in the interaction with centrin. This centrin-binding site is highly conserved within the first nuclear export signal consensus sequence identified in Saccharomyces cerevisiae Prp40. Here, we examine the interaction of HsPrp40A peptide (HsPrp40Ap) with both Hscen2 and Crcen by isothermal titration calorimetry. We employed the thermodynamic parameterization to estimate the polar and apolar surface area of the interface. In addition, we have defined the molecular mechanism of thermally induced unfolding and dissociation of the Crcen-HsPrp40Ap complex using two-dimensional infrared correlation spectroscopy. These complementary techniques showed for the first time, to our knowledge, that HsPrp40Ap interacts with centrin in vitro, supporting a coupled functional role for these proteins in pre-mRNA splicing.
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103
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De Maria S, Ferrari G, Maresca P. Effect of high hydrostatic pressure on the enzymatic hydrolysis of bovine serum albumin. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2017; 97:3151-3158. [PMID: 27885680 DOI: 10.1002/jsfa.8157] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 09/20/2016] [Accepted: 11/20/2016] [Indexed: 06/06/2023]
Abstract
BACKGROUND The extent of enzymatic proteolysis mainly depends on accessibility of the peptide bonds, which stabilize the protein structure. The high hydrostatic pressure (HHP) process is able to induce, at certain operating conditions, protein displacement, thus suggesting that this technology can be used to modify protein resistance to the enzymatic attack. This work aims at investigating the mechanism of enzymatic hydrolysis assisted by HHP performed under different processing conditions (pressure level, treatment time). Bovine serum albumin was selected for the experiments, solubilized in sodium phosphate buffer (25 mg mL-1 , pH 7.5) with α-chymotrypsin or trypsin (E/S ratio = 1/10) and HPP treatment (100-500 MPa, 15-25 min). RESULTS HHP treatment enhanced the extent of the hydrolysis reaction of globular proteins, being more effective than conventional hydrolysis. At HHP treatment conditions maximizing the protein unfolding, the hydrolysis degree of proteins was increased as a consequence of the increased exposure of peptide bonds to the attack of proteolytic enzymes. The maximum hydrolysis degree (10% and 7% respectively for the samples hydrolyzed with α-chymotrypsin and trypsin) was observed for the samples processed at 400 MPa for 25 min. At pressure levels higher than 400 MPa the formation of aggregates was likely to occur; thus the degree of hydrolysis decreased. CONCLUSION Protein unfolding represents the key factor controlling the efficiency of HHP-assisted hydrolysis treatments. The peptide produced under high pressure showed lower dimensions and a different structure with respect to those of the hydrolysates obtained when the hydrolysis was carried out at atmospheric pressure, thus opening new frontiers of application in food science and nutrition. © 2016 Society of Chemical Industry.
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Affiliation(s)
- Serena De Maria
- Department of Industrial Engineering, University of Salerno, Fisciano, (SA), Italy
| | - Giovanna Ferrari
- Department of Industrial Engineering, University of Salerno, Fisciano, (SA), Italy
- ProdAl Scarl, Fisciano, (SA), Italy
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104
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Kisley L, Miller KA, Guin D, Kong X, Gruebele M, Leckband DE. Direct Imaging of Protein Stability and Folding Kinetics in Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2017; 9:21606-21617. [PMID: 28553706 DOI: 10.1021/acsami.7b01371] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We apply fast relaxation imaging (FReI) as a novel technique for investigating the folding stability and dynamics of proteins within polyacrylamide hydrogels, which have diverse and widespread uses in biotechnology. FReI detects protein unfolding in situ by imaging changes in fluorescence resonance energy transfer (FRET) after temperature jump perturbations. Unlike bulk measurements, diffraction-limited epifluorescence imaging combined with fast temperature perturbations reveals the impact of local environment effects on protein-biomaterial compatibility. Our experiments investigated a crowding sensor protein (CrH2) and phosphoglycerate kinase (PGK), which undergoes cooperative unfolding. The crowding sensor quantifies the confinement effect of the cross-linked hydrogel: the 4% polyacrylamide hydrogel is similar to aqueous solution (no confinement), while the 10% hydrogel is strongly confining. FRAP measurements and protein concentration gradients in the 4% and 10% hydrogels further support this observation. PGK reveals that noncovalent interactions of the protein with the polymer surface are more important than confinement for determining protein properties in the gel: the mere presence of hydrogel increases protein stability, speeds up folding relaxation, and promotes irreversible binding to the polymer even at the solution-gel interface, whereas the difference between the 4% and the 10% hydrogels is negligible despite their large difference in confinement. The imaging capabilities of FReI, demonstrated to be diffraction limited, further revealed spatially homogeneous protein unfolding across the hydrogels at 500 nm length scales and revealed differences in protein properties at the gel-solution boundary.
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Affiliation(s)
- Lydia Kisley
- Beckman Institute for Advanced Science and Technology, ‡Department of Chemistry, §Department of Biochemistry, ∥Department of Chemical and Biomolecular Engineering, and ⊥Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Kali A Miller
- Beckman Institute for Advanced Science and Technology, ‡Department of Chemistry, §Department of Biochemistry, ∥Department of Chemical and Biomolecular Engineering, and ⊥Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Drishti Guin
- Beckman Institute for Advanced Science and Technology, ‡Department of Chemistry, §Department of Biochemistry, ∥Department of Chemical and Biomolecular Engineering, and ⊥Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Xinyu Kong
- Beckman Institute for Advanced Science and Technology, ‡Department of Chemistry, §Department of Biochemistry, ∥Department of Chemical and Biomolecular Engineering, and ⊥Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Martin Gruebele
- Beckman Institute for Advanced Science and Technology, ‡Department of Chemistry, §Department of Biochemistry, ∥Department of Chemical and Biomolecular Engineering, and ⊥Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
| | - Deborah E Leckband
- Beckman Institute for Advanced Science and Technology, ‡Department of Chemistry, §Department of Biochemistry, ∥Department of Chemical and Biomolecular Engineering, and ⊥Department of Physics, University of Illinois at Urbana-Champaign , Urbana, Illinois 61801, United States
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105
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106
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Tsiolaki PL, Louros NN, Zompra AA, Hamodrakas SJ, Iconomidou VA. Unraveling the aggregation propensity of human insulin C-peptide. Biopolymers 2017; 108. [PMID: 27257781 DOI: 10.1002/bip.22882] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Revised: 05/19/2016] [Accepted: 05/31/2016] [Indexed: 12/27/2022]
Abstract
Over the last 20 years, proinsulin C-peptide emerged as an important player in various biological events. Much time and effort has been spent in exploring all functional features of C-peptide and recording its implications in Diabetes mellitus. Only a few studies, though, have addressed C-peptide oligomerization and link this procedure with Diabetes. The aim of our work was to examine the aggregation propensity of C-peptide, utilizing Transmission Electron Microscopy, Congo Red staining, ATR-FTIR, and X-ray fiber diffraction at a 10 mg ml-1 concentration. Our experimental work clearly shows that C-peptide self-assembles into amyloid-like fibrils and therefore, the aggregation propensity of C-peptide is a characteristic novel feature that should be related to physiological and also pathological conditions. © 2016 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 108: 1-8, 2017.
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Affiliation(s)
- Paraskevi L Tsiolaki
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, 15701, Greece
| | - Nikolaos N Louros
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, 15701, Greece
| | | | - Stavros J Hamodrakas
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, 15701, Greece
| | - Vassiliki A Iconomidou
- Department of Cell Biology and Biophysics, Faculty of Biology, University of Athens, Panepistimiopolis, Athens, 15701, Greece
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107
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Awada H, Grison CM, Charnay-Pouget F, Baltaze JP, Brisset F, Guillot R, Robin S, Hachem A, Jaber N, Naoufal D, Yazbeck O, Aitken DJ. Conformational Effects through Hydrogen Bonding in a Constrained γ-Peptide Template: From Intraresidue Seven-Membered Rings to a Gel-Forming Sheet Structure. J Org Chem 2017; 82:4819-4828. [PMID: 28398045 DOI: 10.1021/acs.joc.7b00494] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A series of three short oligomers (di-, tri-, and tetramers) of cis-2-(aminomethyl)cyclobutane carboxylic acid, a γ-amino acid featuring a cyclobutane ring constraint, were prepared, and their conformational behavior was examined spectroscopically and by molecular modeling. In dilute solutions, these peptides showed a number of low-energy conformers, including ribbonlike structures pleated around a rarely observed series of intramolecular seven-membered hydrogen bonds. In more concentrated solutions, these interactions defer to an organized supramolecular assembly, leading to thermoreversible organogel formation notably for the tripeptide, which produced fibrillar xerogels. In the solid state, the dipeptide adopted a fully extended conformation featuring a one-dimensional network of intermolecularly H-bonded molecules stacked in an antiparallel sheet alignment. This work provides unique insight into the interplay between inter- and intramolecular H-bonded conformer topologies for the same peptide template.
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Affiliation(s)
- Hawraà Awada
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France.,Inorganic and Organometallic Coordination Chemistry Laboratory and Laboratory for Medicinal Chemistry and Natural Products, Faculty of Sciences (I) & PRASE-EDST, Lebanese University , Hadath, Lebanon
| | - Claire M Grison
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France
| | - Florence Charnay-Pouget
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France
| | - Jean-Pierre Baltaze
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France
| | - François Brisset
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France
| | - Régis Guillot
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France
| | - Sylvie Robin
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France.,UFR Sciences Pharmaceutiques et Biologiques, Université Paris Descartes , 4 avenue de l'Observatoire, 75270 Paris cedex 06, France
| | - Ali Hachem
- Inorganic and Organometallic Coordination Chemistry Laboratory and Laboratory for Medicinal Chemistry and Natural Products, Faculty of Sciences (I) & PRASE-EDST, Lebanese University , Hadath, Lebanon
| | - Nada Jaber
- Inorganic and Organometallic Coordination Chemistry Laboratory and Laboratory for Medicinal Chemistry and Natural Products, Faculty of Sciences (I) & PRASE-EDST, Lebanese University , Hadath, Lebanon
| | - Daoud Naoufal
- Inorganic and Organometallic Coordination Chemistry Laboratory and Laboratory for Medicinal Chemistry and Natural Products, Faculty of Sciences (I) & PRASE-EDST, Lebanese University , Hadath, Lebanon
| | - Ogaritte Yazbeck
- Inorganic and Organometallic Coordination Chemistry Laboratory and Laboratory for Medicinal Chemistry and Natural Products, Faculty of Sciences (I) & PRASE-EDST, Lebanese University , Hadath, Lebanon
| | - David J Aitken
- CP3A Organic Synthesis Group and Services Communs, ICMMO, UMR 8182, CNRS, Université Paris Sud, Université Paris Saclay , Bât. 420, 15 rue Georges Clemenceau, 91405 Orsay cedex, France
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108
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Nanofibers of Human Tropoelastin-inspired peptides: Structural characterization and biological properties. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 77:927-934. [PMID: 28532113 DOI: 10.1016/j.msec.2017.04.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 03/31/2017] [Accepted: 04/03/2017] [Indexed: 11/23/2022]
Abstract
Regenerative medicine is taking great advantage from the use of biomaterials in the treatments of a wide range of diseases and injuries. Among other biomaterials, self-assembling peptides are appealing systems due to their ability to spontaneously form nanostructured hydrogels that can be directly injected into lesions. Indeed, self-assembling peptide scaffolds are expected to behave as biomimetic matrices able to surround cells, to promote specific interactions, and to control and modify cell behavior by mimicking the native environment as well. We selected three pentadecapeptides inspired by Human Tropoelastin, a natural protein of the extracellular matrix, expected to show high biocompatibility. Moreover, the here proposed self-assembling peptides (SAPs) are able to spontaneously aggregate in nanofibers in biological environment, as revealed by AFM (Atomic Force Microscopy). Peptides were characterized by XPS (X-ray Photoelectron Spectroscopy) and IRRAS (Infrared Reflection Absorption Spectroscopy) both as lyophilized (not aggregated) and as aggregated (nanofibers) samples in order to investigate some potential differences in their chemical composition and intermolecular interactions, and to analyze the surface and interface of nanofibers. Finally, an accurate investigation of the biological properties of the SAPs and of their interaction with cells was performed by culturing for the first time human Mesenchymal Stem Cells (hMSCs) in presence of SAPs. The final aim of this work was to assess if Human Tropoelastin-inspired nanostructured fibers could exert a cytotoxic effect and to evaluate their biocompatibility, cellular adhesion and proliferation.
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109
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Kurek M, Carnoy M, Larsen PE, Nielsen LH, Hansen O, Rades T, Schmid S, Boisen A. Nanomechanical Infrared Spectroscopy with Vibrating Filters for Pharmaceutical Analysis. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Maksymilian Kurek
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads, Building 345C 2800 Kgs. Lyngby Denmark
| | - Matthias Carnoy
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads, Building 345C 2800 Kgs. Lyngby Denmark
| | - Peter E. Larsen
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads, Building 345C 2800 Kgs. Lyngby Denmark
| | - Line H. Nielsen
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads, Building 345C 2800 Kgs. Lyngby Denmark
| | - Ole Hansen
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads, Building 345C 2800 Kgs. Lyngby Denmark
| | - Thomas Rades
- Department of Pharmacy; University of Copenhagen; Universitetsparken 2 2100 Copenhagen Denmark
| | - Silvan Schmid
- Institute of Sensor and Actuator Systems; TU Wien; Gusshausstrasse 27-29 1040 Vienna Austria
| | - Anja Boisen
- Department of Micro- and Nanotechnology; Technical University of Denmark; Ørsteds Plads, Building 345C 2800 Kgs. Lyngby Denmark
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110
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Ansari JM, Abraham NM, Massaro J, Murphy K, Smith-Carpenter J, Fikrig E. Anti-Biofilm Activity of a Self-Aggregating Peptide against Streptococcus mutans. Front Microbiol 2017; 8:488. [PMID: 28392782 PMCID: PMC5364132 DOI: 10.3389/fmicb.2017.00488] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Accepted: 03/09/2017] [Indexed: 12/13/2022] Open
Abstract
Streptococcus mutans is the primary agent of dental cavities, in large part due to its ability to adhere to teeth and create a molecular scaffold of glucan polysaccharides on the tooth surface. Disrupting the architecture of S. mutans biofilms could help undermine the establishment of biofilm communities that cause cavities and tooth decay. Here we present a synthetic peptide P1, derived from a tick antifreeze protein, which significantly reduces S. mutans biofilm formation. Incubating cells with this peptide decreased biofilm biomass by approximately 75% in both a crystal violet microplate assay and an in vitro tooth model using saliva-coated hydroxyapatite discs. Bacteria treated with peptide P1 formed irregular biofilms with disconnected aggregates of cells and exopolymeric matrix that readily detached from surfaces. Peptide P1 can bind directly to S. mutans cells but does not possess bactericidal activity. Anti-biofilm activity was correlated with peptide aggregation and β-sheet formation in solution, and alternative synthetic peptides of different lengths or charge distribution did not inhibit biofilms. This anti-biofilm peptide interferes with S. mutans biofilm formation and architecture, and may have future applications in preventing bacterial buildup on teeth.
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Affiliation(s)
| | - Nabil M Abraham
- Department of Internal Medicine, Section of Infectious Diseases, Yale University School of Medicine, New HavenCT, USA; Howard Hughes Medical Institute, Chevy ChaseMD, USA
| | - Jenna Massaro
- Department of Biology, Fairfield University, Fairfield CT, USA
| | - Kelsey Murphy
- Department of Biology, Fairfield University, Fairfield CT, USA
| | | | - Erol Fikrig
- Department of Internal Medicine, Section of Infectious Diseases, Yale University School of Medicine, New HavenCT, USA; Howard Hughes Medical Institute, Chevy ChaseMD, USA
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111
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Kurek M, Carnoy M, Larsen PE, Nielsen LH, Hansen O, Rades T, Schmid S, Boisen A. Nanomechanical Infrared Spectroscopy with Vibrating Filters for Pharmaceutical Analysis. Angew Chem Int Ed Engl 2017; 56:3901-3905. [PMID: 28266106 DOI: 10.1002/anie.201700052] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2017] [Revised: 01/31/2017] [Indexed: 12/30/2022]
Abstract
Standard infrared spectroscopy techniques are well-developed and widely used. However, they typically require milligrams of sample and can involve time-consuming sample preparation. A promising alternative is represented by nanomechanical infrared spectroscopy (NAM-IR) based on the photothermal response of a nanomechanical resonator, which enables the chemical analysis of picograms of analyte directly from a liquid solution in only a few minutes. Herein, we present NAM-IR using perforated membranes (filters). The method was tested with the pharmaceutical compound indomethacin to successfully perform a chemical and morphological analysis on roughly 100 pg of sample. With an absolute estimated sensitivity of 109±15 fg, the presented method is suitable for ultrasensitive vibrational spectroscopy.
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Affiliation(s)
- Maksymilian Kurek
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, Building 345C, 2800, Kgs. Lyngby, Denmark
| | - Matthias Carnoy
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, Building 345C, 2800, Kgs. Lyngby, Denmark
| | - Peter E Larsen
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, Building 345C, 2800, Kgs. Lyngby, Denmark
| | - Line H Nielsen
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, Building 345C, 2800, Kgs. Lyngby, Denmark
| | - Ole Hansen
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, Building 345C, 2800, Kgs. Lyngby, Denmark
| | - Thomas Rades
- Department of Pharmacy, University of Copenhagen, Universitetsparken 2, 2100, Copenhagen, Denmark
| | - Silvan Schmid
- Institute of Sensor and Actuator Systems, TU Wien, Gusshausstrasse 27-29, 1040, Vienna, Austria
| | - Anja Boisen
- Department of Micro- and Nanotechnology, Technical University of Denmark, Ørsteds Plads, Building 345C, 2800, Kgs. Lyngby, Denmark
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112
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Ballottin D, Fulaz S, Cabrini F, Tsukamoto J, Durán N, Alves OL, Tasic L. Antimicrobial textiles: Biogenic silver nanoparticles against Candida and Xanthomonas. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2017; 75:582-589. [PMID: 28415502 DOI: 10.1016/j.msec.2017.02.110] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 12/15/2016] [Accepted: 02/21/2017] [Indexed: 11/29/2022]
Abstract
This paper introduces cotton fibers impregnated with biogenic silver nanoparticles (AgNPs), synthesized from a Fusarium oxysporum fungal filtrate (FF) solution, and open up the possibility for their use in medical environment and agriculture clothing as means to avoid microbial spreading. After thorough AgNPs characterization, regarding their physical, chemical and biochemical properties, Minimum Inhibitory Concentrations (MIC) against some human and orange tree pathogens were determined. We report the strong AgNPs activity against Candida parapsilosis and Xanthomonas axonopodis pv. citri (Xac) that was morphologically characterized, pointing to strong AgNPs effects on microorganisms' membranes. Cotton fibers were then impregnated with AgNPs suspension and these maintained strong antimicrobial activity even after repeated mechanical washing cycles (up to 10). Reported data might point to an application for biogenic AgNPs as potent agrochemicals, as well as, to their application in textiles for antiseptic clothing for medical and agronomic applications.
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Affiliation(s)
- Daniela Ballottin
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil; NanoBioss Laboratory, Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Stephanie Fulaz
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Flávia Cabrini
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Junko Tsukamoto
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Nelson Durán
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil; NanoBioss Laboratory, Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil; Brazilian Nanotechnology National Laboratory (LNNano-CNPEM), Campinas, SP, Brazil
| | - Oswaldo L Alves
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil; NanoBioss Laboratory, Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil
| | - Ljubica Tasic
- Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil; NanoBioss Laboratory, Institute of Chemistry, University of Campinas (UNICAMP), Campinas, SP, Brazil.
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113
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Fuertes A, Ozores HL, Amorín M, Granja JR. Self-assembling Venturi-like peptide nanotubes. NANOSCALE 2017; 9:748-753. [PMID: 27973623 DOI: 10.1039/c6nr08174f] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We describe the design and synthesis of self-assembling peptide nanotubes that have an internal filter area and whose length and internal diameters, at the entrance and in the constricted area, are precisely controlled.
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Affiliation(s)
- Alberto Fuertes
- Singular Research Centre in Chemical Biology and Molecular Materials, (CIQUS), Organic Chemistry Department, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain.
| | - Haxel Lionel Ozores
- Singular Research Centre in Chemical Biology and Molecular Materials, (CIQUS), Organic Chemistry Department, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain.
| | - Manuel Amorín
- Singular Research Centre in Chemical Biology and Molecular Materials, (CIQUS), Organic Chemistry Department, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain.
| | - Juan R Granja
- Singular Research Centre in Chemical Biology and Molecular Materials, (CIQUS), Organic Chemistry Department, University of Santiago de Compostela (USC), 15782 Santiago de Compostela, Spain.
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114
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Blatz TJ, Fry MM, James EI, Albin TJ, Pollard Z, Kowalczyk T, Murphy AR. Templating the 3D structure of conducting polymers with self-assembling peptides. J Mater Chem B 2017; 5:4690-4696. [DOI: 10.1039/c7tb00221a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Polymerization of pre-assembled peptide–thiophene monomers produced electrically conductive gels with fibrous, porous structures.
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Affiliation(s)
- T. J. Blatz
- Department of Chemistry
- Western Washington University
- Bellingham
- USA
| | - M. M. Fry
- Department of Chemistry
- Western Washington University
- Bellingham
- USA
| | - E. I. James
- Department of Chemistry
- Western Washington University
- Bellingham
- USA
| | - T. J. Albin
- Department of Chemistry
- Western Washington University
- Bellingham
- USA
| | - Z. Pollard
- Advanced Materials Science and Engineering Center
- Western Washington University
- Bellingham
- USA
| | - T. Kowalczyk
- Department of Chemistry
- Western Washington University
- Bellingham
- USA
- Advanced Materials Science and Engineering Center
| | - A. R. Murphy
- Department of Chemistry
- Western Washington University
- Bellingham
- USA
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115
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Srour B, Bruechert S, Andrade SLA, Hellwig P. Secondary Structure Determination by Means of ATR-FTIR Spectroscopy. Methods Mol Biol 2017; 1635:195-203. [PMID: 28755370 DOI: 10.1007/978-1-4939-7151-0_10] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Specialized infrared spectroscopic techniques have been developed that allow studying the secondary structure of membrane proteins and the influence of crucial parameters like lipid content and detergent. Here, we focus on an ATR-FTIR spectroscopic study of Af-Amt1 and the influence of LDAO/glycerol on its structural integrity. Our results clearly indicate that infrared spectroscopy can be used to identify the adapted sample conditions.
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Affiliation(s)
- Batoul Srour
- Laboratoire de Bioelectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg, Strasbourg, France
| | - Stefan Bruechert
- Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Susana L A Andrade
- BIOSS Centre for Biological Signalling Studies, Schänzlestr. 1, 79104, Freiburg, Germany
- Institut für Biochemie, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79104, Freiburg, Germany
| | - Petra Hellwig
- Laboratoire de Bioelectrochimie et Spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg, Strasbourg, France.
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116
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Gu X, Bai B, Wang H, Li M. Multistimuli-responsive organogels based on hydrazide and azobenzene derivatives. RSC Adv 2017. [DOI: 10.1039/c6ra24886a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The length and parity of the central flexible spacer play crucial roles in the organogels based on liquid crystal dimer containing hydrazide and azobenzene units. And the organogel exhibited multiple stimuli-responsive behaviors including temperature, light, pH and anion.
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Affiliation(s)
- Xiaojun Gu
- Key Laboratory of Coherent Light and Atomic and Molecular Spectroscopy of Ministry of Education
- College of Physics
- Jilin University
- Changchun 130012
- PR China
| | - Binglian Bai
- Key Laboratory of Coherent Light and Atomic and Molecular Spectroscopy of Ministry of Education
- College of Physics
- Jilin University
- Changchun 130012
- PR China
| | - Haitao Wang
- Key Laboratory for Automobile Materials (JLU)
- Ministry of Education
- College of Materials Science and Engineering
- Jilin University
- Changchun 130012
| | - Min Li
- Key Laboratory for Automobile Materials (JLU)
- Ministry of Education
- College of Materials Science and Engineering
- Jilin University
- Changchun 130012
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117
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Pramanik A, Haldar D. Packing-induced solid-state fluorescence and thermochromic behavior of peptidic luminophores. RSC Adv 2017. [DOI: 10.1039/c6ra24799g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In spite of its coumarin chromophore, supramolecular packing has an effect on the solid state fluorescent propensities of the peptidic luminophores.
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Affiliation(s)
- Apurba Pramanik
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
| | - Debasish Haldar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
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118
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Ballottin D, Fulaz S, Souza ML, Corio P, Rodrigues AG, Souza AO, Gaspari PM, Gomes AF, Gozzo F, Tasic L. Elucidating Protein Involvement in the Stabilization of the Biogenic Silver Nanoparticles. NANOSCALE RESEARCH LETTERS 2016; 11:313. [PMID: 27356560 PMCID: PMC4927534 DOI: 10.1186/s11671-016-1538-y] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Accepted: 06/24/2016] [Indexed: 05/18/2023]
Abstract
Silver nanoparticles (AgNPs) have been broadly used as antibacterial and antiviral agents. Further, interests for green AgNP synthesis have increased in recent years and several results for AgNP biological synthesis have been reported using bacteria, fungi and plant extracts. The understanding of the role and nature of fungal proteins, their interaction with AgNPs and the subsequent stabilization of nanosilver is yet to be deeply investigated. Therefore, in an attempt to better understand biogenic AgNP stabilization with the extracellular fungal proteins and to describe these supramolecular interactions between proteins and silver nanoparticles, AgNPs, produced extracellularly by Aspergillus tubingensis-isolated as an endophytic fungus from Rizophora mangle-were characterized in order to study their physical characteristics, identify the involved proteins, and shed light into the interactions among protein-NPs by several techniques. AgNPs of around 35 nm in diameter as measured by TEM and a positive zeta potential of +8.48 mV were obtained. These AgNPs exhibited a surface plasmon resonance (SPR) band at 440 nm, indicating the nanoparticles formation, and another band at 280 nm, attributed to the electronic excitations in tryptophan, tyrosine, and/or phenylalanine residues in fungal proteins. Fungal proteins were covalently bounded to the AgNPs, mainly through S-Ag bonds due to cysteine residues (HS-) and with few N-Ag bonds from H2N- groups, as verified by Raman spectroscopy. Observed supramolecular interactions also occur by electrostatic and other protein-protein interactions. Furthermore, proteins that remain free on AgNP surface may perform hydrogen bonds with other proteins or water increasing thus the capping layer around the AgNPs and consequently expanding the hydrodynamic diameter of the particles (~264 nm, measured by DLS). FTIR results enabled us to state that proteins adsorbed to the AgNPs did not suffer relevant secondary structure alteration upon their physical interaction with the AgNPs or when covalently bonded to them. Eight proteins in the AgNP dispersion were identified by mass spectrometry analyses. All these proteins are involved in metabolic pathways of the fungus and are important for carbon, phosphorous and nitrogen uptake, and for the fungal growth. Thereby, important proteins for fungi are also involved in the formation and stabilization of the biogenic AgNPs.
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Affiliation(s)
- Daniela Ballottin
- Laboratório de Química Biológica, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
- NanoBioss, SisNano, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Stephanie Fulaz
- Laboratório de Química Biológica, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Michele L Souza
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
- Instituto de Ciências Exatas, Universidade Federal Fluminense, Volta Redonda, RJ, Brazil
| | - Paola Corio
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP, Brazil
| | | | - Ana O Souza
- Laboratório de Bioquímica e Biofísica, Instituto Butantan, São Paulo, SP, Brazil
| | - Priscyla M Gaspari
- Laboratório de Nanobiotecnologia, Faculdade de Ciências Farmacêuticas, Universidade de São Paulo, Riberão Preto, SP, Brazil
| | - Alexandre F Gomes
- Laboratório Dalton, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Fábio Gozzo
- Laboratório Dalton, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil
| | - Ljubica Tasic
- Laboratório de Química Biológica, Instituto de Química, Universidade Estadual de Campinas, Campinas, SP, Brazil.
- NanoBioss, SisNano, Universidade Estadual de Campinas, Campinas, SP, Brazil.
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119
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Creasey RCG, Louzao I, Arnon ZA, Marco P, Adler-Abramovich L, Roberts CJ, Gazit E, Tendler SJB. Disruption of diphenylalanine assembly by a Boc-modified variant. SOFT MATTER 2016; 12:9451-9457. [PMID: 27841428 DOI: 10.1039/c6sm01770c] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Peptide-based biomaterials are key to the future of diagnostics and therapy, promoting applications such as tissue scaffolds and drug delivery vehicles. To realise the full potential of the peptide systems, control and optimisation of material properties are essential. Here we investigated the co-assembly of the minimal amyloid motif peptide, diphenylalanine (FF), and its tert-butoxycarbonyl (Boc)-modified derivative. Using Atomic Force Microscopy, we demonstrated that the co-assembled fibers are less rigid and show a curvier morphology. We propose that the Boc-modification of FF disrupts the hydrogen bond packing of adjacent N-termini, as supported by Fourier transform infrared and fluorescence spectroscopic data. Such rationally modified co-assemblies offer chemical functionality for after-assembly modification and controllable surface properties for tissue engineering scaffolds, along with tunable morphological vs. mechanical properties.
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Affiliation(s)
| | - Iria Louzao
- School of Pharmacy, University of Nottingham, NG7 2RD Nottingham, UK
| | - Zohar A Arnon
- Department for Molecular Microbiology and Biotechnology, Tel Aviv University, 6997801 Tel Aviv, Israel
| | - Pini Marco
- Department for Molecular Microbiology and Biotechnology, Tel Aviv University, 6997801 Tel Aviv, Israel
| | - Lihi Adler-Abramovich
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine, Tel Aviv University, 6997801 Tel Aviv, Israel
| | - Clive J Roberts
- School of Pharmacy, University of Nottingham, NG7 2RD Nottingham, UK
| | - Ehud Gazit
- Department for Molecular Microbiology and Biotechnology, Tel Aviv University, 6997801 Tel Aviv, Israel
| | - Saul J B Tendler
- School of Pharmacy, University of Nottingham, NG7 2RD Nottingham, UK
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120
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Thermal and redox dual responsive poly(L-glutamate) with oligo(ethylene glycol) side-chains. CHINESE JOURNAL OF POLYMER SCIENCE 2016. [DOI: 10.1007/s10118-016-1861-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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121
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Hamley IW, Hutchinson J, Kirkham S, Castelletto V, Kaur A, Reza M, Ruokolainen J. Nanosheet Formation by an Anionic Surfactant-like Peptide and Modulation of Self-Assembly through Ionic Complexation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10387-10393. [PMID: 27636825 DOI: 10.1021/acs.langmuir.6b02180] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
The surfactant-like peptide (Ala)6-(Asp) (A6D) is shown to self-assemble into ultrathin (3 nm thick) nanosheets in aqueous solution above a critical aggregation concentration. A combination of circular dichroism and FTIR spectroscopy and X-ray diffraction shows that the nanosheets comprise interdigitated bilayers of the peptide with β-sheet conformation. The self-assembly can be modulated by addition of hexamethylenediamine which is expected to interact with the anionic C terminus (and C-terminal D residue) of the peptide. Multiple ordered nanostructures can be accessed depending on the amount of added diamine. Nanosheet and bicontinuous network structures were observed using cryogenic-TEM and small-angle X-ray scattering. Addition of hexamethylenediamine at a sufficiently large molar ratio leads to disruption of the ordered nanostructure and the formation of a solution of A6D-diamine molecular complexes with highly charged end groups. The multiple acid-functionalized nanostructures that are accessible in this system are expected to have many applications in the fabrication of new nanomaterials.
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Affiliation(s)
- Ian W Hamley
- Department of Chemistry, University of Reading, Whiteknights , Reading RG6 6AD, U.K
| | - Jessica Hutchinson
- Department of Chemistry, University of Reading, Whiteknights , Reading RG6 6AD, U.K
| | - Steven Kirkham
- Department of Chemistry, University of Reading, Whiteknights , Reading RG6 6AD, U.K
| | - Valeria Castelletto
- Department of Chemistry, University of Reading, Whiteknights , Reading RG6 6AD, U.K
| | - Amanpreet Kaur
- Department of Chemistry, University of Reading, Whiteknights , Reading RG6 6AD, U.K
| | - Mehedi Reza
- Department of Applied Physics, Aalto University School of Science , P. O. Box 15100, FI-00076 Aalto, Finland
| | - Janne Ruokolainen
- Department of Applied Physics, Aalto University School of Science , P. O. Box 15100, FI-00076 Aalto, Finland
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122
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Suwal S, Amiot J, Beaulieu L, Bazinet L. Effect of pulsed electric field and polarity reversal on peptide/amino acid migration, selectivity and fouling mitigation. J Memb Sci 2016. [DOI: 10.1016/j.memsci.2016.03.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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123
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Self-assembling peptide hydrogels immobilized on silicon surfaces. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 69:200-7. [PMID: 27612705 DOI: 10.1016/j.msec.2016.06.060] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2016] [Revised: 05/27/2016] [Accepted: 06/19/2016] [Indexed: 11/24/2022]
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124
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Nanoparticle fouling and its combination with organic fouling during forward osmosis process for silver nanoparticles removal from simulated wastewater. Sci Rep 2016; 6:25859. [PMID: 27160045 PMCID: PMC4861925 DOI: 10.1038/srep25859] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 04/22/2016] [Indexed: 11/08/2022] Open
Abstract
The increasing and wide application of silver nanoparticles (Ag NPs) has resulted in their appearance in wastewater. In consideration of their potential toxicity and environmental impacts, it is necessary to find effective technology for their removal from wastewater. Here, forward osmosis (FO) membrane was applied for Ag NPs removal from wastewater, and single and combined fouling of nanoparticles and organic macromolecules were further investigated during the FO process. The findings demonstrated that FO membrane can effectively remove Ag NPs from wastewater due to its high rejection performance. Fouling tests indicated that water flux declined appreciably even at the beginning of the single Ag NPs fouling test, and more remarkable flux decline and larger amounts of deposited Ag NPs were observed with an increase of Ag NPs concentration. However, the addition of bovine serum albumin (BSA) could effectively alleviate the FO membrane fouling induced by Ag NPs. The interaction between Ag NPs and BSA was responsible for this phenomenon. BSA can easily form a nanoparticle-protein corona surrounded nanoparticles, which prevented nanoparticles from aggregation due to the steric stabilization mechanism. Furthermore, the interaction between BSA and Ag NPs occurred not only in wastewater but also on FO membrane surface.
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125
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Wei R, Jin CC, Quan J, Nie HL, Zhu LM. A novel self-assembling peptide with UV-responsive properties. Biopolymers 2016; 101:272-8. [PMID: 23828220 DOI: 10.1002/bip.22346] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2013] [Revised: 06/11/2013] [Accepted: 06/19/2013] [Indexed: 11/11/2022]
Abstract
A novel heptapeptide comprising Ile-Gln-Ser-Pro-His-Phe-Phe (IQSPHFF) identified and found to undergo self-assembly into microparticles in solution. To understand the effects of ultraviolet (UV) irradiation on the self-assembly process, IQSPHFF solutions were exposed to the UV light of 365 nm at room temperature. This exposure was found to have a profound effect on the morphology of the self-assembled aggregates, converting the microparticles to nanorod shapes. Circular dichroism and FTIR studies indicated distinct structural differences in the arrangements of the peptide moieties before and after UV irradiation. However, Mass spectrum analysis and high performance liquid chromatography of the peptide molecules before and after UV irradiation demonstrated that the chemical structure of IQSPHFF was not changed. UV-visible spectroscopy and fluorescence spectroscopy studies showed that the absorption peak both increased after UV irradiation. Overall, our data show that the heptapeptide with UV-responsive properties.
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Affiliation(s)
- Ran Wei
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, Shanghai, 201620, Peoples Republic of China
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126
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Salvi AM, Moscarelli P, Bochicchio B, Lanza G, Castle JE. Combined effects of solvation and aggregation propensity on the final supramolecular structures adopted by hydrophobic, glycine-rich, elastin-like polypeptides. Biopolymers 2016; 99:292-313. [PMID: 23426573 DOI: 10.1002/bip.22160] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2012] [Revised: 08/11/2012] [Accepted: 09/14/2012] [Indexed: 01/25/2023]
Abstract
Previous work on elastin-like polypeptides (ELPs) made of hydrophobic amino acids of the type XxxGlyGlyZzzGly (Xxx, Zzz = Val, Leu) has consistently shown that differing dominant supramolecular structures were formed when the suspending media were varied: helical, amyloid-like fibers when suspended in water and globules evolving into "string of bead" structures, poly(ValGlyGlyValGly), or cigar-like bundles, poly(ValGlyGlyLeuGly), when suspended in methyl alcohol. Comparative experiments with poly(LeuGlyGlyValGly) have further indicated that the interface energy plays a significant role and that solvation effects act in concomitance with the intrinsic aggregation propensity of the repeat sequence. Continuing our investigation on ELPs using surface (X-ray photoelectron spectroscopy, atomic force microscopy) and bulk (circular dichroism, Fourier transform infrared spectroscopy) techniques for their characterization, here we have compared the effect of suspending solvents (H(2)O, dimethylsulfoxide, ethylene glycol, and MeOH) on poly(ValGlyGlyValGly), the polypeptide most inclined to form long and well-refined helical fibers in water, searching for the signature of intermolecular interactions occurring between the polypeptide chains in the given suspension. The influence of sequence specificities has been studied by comparing poly(ValGlyGlyValGly) and poly(LeuGlyGlyValGly) with a similar degree of polymerization. Deposits on substrates of the polypeptides were characterized taking into account the differing evaporation rate of solvents, and tests on their stability in ultra high vacuum were performed. Finally, combining experimental and computational studies, we have revaluated the three-dimensional modeling previously proposed for the supramolecular assembly in water of poly(ValGlyGlyValGly). The results were discussed and rationalized also in the light of published data.
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Affiliation(s)
- Anna M Salvi
- Dipartimento di Chimica 'Antonio Mario Tamburro,' Università della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
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127
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Savadkoohi S, Bannikova A, Mantri N, Kasapis S. Structural modification in condensed soy glycinin systems following application of high pressure. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2014.07.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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128
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Rodríguez-Vázquez N, Fuertes A, Amorín M, Granja JR. Bioinspired Artificial Sodium and Potassium Ion Channels. Met Ions Life Sci 2016; 16:485-556. [DOI: 10.1007/978-3-319-21756-7_14] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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129
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Fu X, Ma Y, Sun J, Li Z. Biodegradable thermal- and redox-responsive poly(l-glutamate) with Y-shaped oligo(ethylene glycol) side-chain and tunable phase transition temperature. RSC Adv 2016. [DOI: 10.1039/c6ra17427b] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of poly(l-glutamate) bearing Y-shaped oligo(ethylene glycol)x side-chains were synthesized via a combination of ROP and thiol–yne photoaddition. The polypeptides showed dual thermal and redox-responsive properties.
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Affiliation(s)
- Xiaohui Fu
- School of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- China
- Institute of Chemistry
| | - Yinan Ma
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Jing Sun
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- China
| | - Zhibo Li
- School of Polymer Science and Engineering
- Qingdao University of Science and Technology
- Qingdao 266042
- China
- Institute of Chemistry
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130
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Hellwig P, Kriegel S, Friedrich T. Infrared spectroscopic studies on reaction induced conformational changes in the NADH ubiquinone oxidoreductase (complex I). BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2015; 1857:922-7. [PMID: 26702948 DOI: 10.1016/j.bbabio.2015.12.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 12/08/2015] [Accepted: 12/14/2015] [Indexed: 10/22/2022]
Abstract
Redox-dependent conformational changes are currently discussed to be a crucial part of the reaction mechanism of the respiratory complex I. Specialized difference Fourier transform infrared techniques allow the detection of side-chain movements and minute secondary structure changes. For complex I, (1)H/(2)H exchange kinetics of the amide modes revealed a better accessibility of the backbone in the presence of NADH and quinone. Interestingly, the presence of phospholipids, that is crucial for the catalytic activity of the isolated enzyme complex, changes the overall conformation. When comparing complex I samples from different species, very similar electrochemically induced FTIR difference spectra and very similar rearrangements are reported. Finally, the information obtained with variants and from Zn(2+) inhibited samples for the conformational reorganization of complex I upon electron transfer are discussed in this review. This article is part of a Special Issue entitled Respiratory complex I, edited by Volker Zickermann and Ulrich Brandt.
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Affiliation(s)
- Petra Hellwig
- Laboratoire de bioelectrochimie et spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, Strasbourg, France
| | - Sébastien Kriegel
- Laboratoire de bioelectrochimie et spectroscopie, UMR 7140, Chimie de la Matière Complexe, Université de Strasbourg-CNRS, Strasbourg, France
| | - Thorsten Friedrich
- Albert-Ludwigs-Universität Freiburg, Institut für Biochemie, Albertstr. 21, 79104 Freiburg i. Br., Germany
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131
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Suwal S, Doyen A, Bazinet L. Characterization of protein, peptide and amino acid fouling on ion-exchange and filtration membranes: Review of current and recently developed methods. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2015.08.056] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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132
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Dinesh B, Squillaci MA, Ménard-Moyon C, Samorì P, Bianco A. Self-assembly of diphenylalanine backbone homologues and their combination with functionalized carbon nanotubes. NANOSCALE 2015; 7:15873-9. [PMID: 26359907 DOI: 10.1039/c5nr04665c] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The integration of carbon nanotubes (CNTs) into organized nanostructures is of great interest for applications in materials science and biomedicine. In this work we studied the self-assembly of β and γ homologues of diphenylalanine peptides under different solvent and pH conditions. We aimed to investigate the role of peptide backbone in tuning the formation of different types of nanostructures alone or in combination with carbon nanotubes. In spite of having the same side chain, β and γ peptides formed distinctively different nanofibers, a clear indication of the role played by the backbone homologation on the self-assembly. The variation of the pH allowed to transform the nanofibers into spherical structures. Moreover, the co-assembly of β and γ peptides with carbon nanotubes covalently functionalized with the same peptide generated unique dendritic assemblies. This comparative study on self-assembly using diphenylalanine backbone homologues and of the co-assembly with CNT covalent conjugates is the first example exploring the capacity of β and γ peptides to adopt precise nanostructures, particularly in combination with carbon nanotubes. The dendritic organization obtained by mixing carbon nanotubes and peptides might find interesting applications in tissue engineering and neuronal interfacing.
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Affiliation(s)
- Bhimareddy Dinesh
- CNRS, Institut de Biologie Moléculaire et Cellulaire, Laboratoire d'Immunopathologie et Chimie Thérapeutique, 67000 Strasbourg, France.
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133
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Temporal evolution of helix hydration in a light-gated ion channel correlates with ion conductance. Proc Natl Acad Sci U S A 2015; 112:E5796-804. [PMID: 26460012 DOI: 10.1073/pnas.1511462112] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
The discovery of channelrhodopsins introduced a new class of light-gated ion channels, which when genetically encoded in host cells resulted in the development of optogenetics. Channelrhodopsin-2 from Chlamydomonas reinhardtii, CrChR2, is the most widely used optogenetic tool in neuroscience. To explore the connection between the gating mechanism and the influx and efflux of water molecules in CrChR2, we have integrated light-induced time-resolved infrared spectroscopy and electrophysiology. Cross-correlation analysis revealed that ion conductance tallies with peptide backbone amide I vibrational changes at 1,665(-) and 1,648(+) cm(-1). These two bands report on the hydration of transmembrane α-helices as concluded from vibrational coupling experiments. Lifetime distribution analysis shows that water influx proceeded in two temporally separated steps with time constants of 10 μs (30%) and 200 μs (70%), the latter phase concurrent with the start of ion conductance. Water efflux and the cessation of the ion conductance are synchronized as well, with a time constant of 10 ms. The temporal correlation between ion conductance and hydration of helices holds for fast (E123T) and slow (D156E) variants of CrChR2, strengthening its functional significance.
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134
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Sánchez M, Scirè A, Tanfani F, Ausili A. The thermal unfolding of the ribosome-inactivating protein saporin-S6 characterized by infrared spectroscopy. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:1357-64. [DOI: 10.1016/j.bbapap.2015.06.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Revised: 06/08/2015] [Accepted: 06/17/2015] [Indexed: 10/23/2022]
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135
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Ma Y, Sato R, Li Z, Numata K. Chemoenzymatic Synthesis of Oligo(L-cysteine) for Use as a Thermostable Bio-Based Material. Macromol Biosci 2015; 16:151-9. [PMID: 26388290 DOI: 10.1002/mabi.201500255] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Revised: 08/13/2015] [Indexed: 11/06/2022]
Abstract
Oligomerization of thiol-unprotected L-cysteine ethyl ester (Cys-OEt) catalyzed by proteinase K in aqueous solution has been used to synthesize oligo(L-cysteine) (OligoCys) with a well-defined chemical structure and relatively large degree of polymerization (DP) up to 16-17 (average 8.8). By using a high concentration of Cys-OEt, 78.0% free thiol content was achieved. The thermal properties of OligoCys are stable, with no glass transition until 200 °C, and the decomposition temperature could be increased by oxidation. Chemoenzymatically synthesized OligoCys has great potential for use as a thermostable bio-based material with resistance to oxidation.
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Affiliation(s)
- Yinan Ma
- Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Ryota Sato
- Enzyme Research Team, Biomass Engineering Program Cooperation Division, Center for Sustainable Resource Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Zhibo Li
- Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China. .,School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
| | - Keiji Numata
- Enzyme Research Team, Biomass Engineering Program Cooperation Division, Center for Sustainable Resource Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan.
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136
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da Silva ER, Walter MNM, Reza M, Castelletto V, Ruokolainen J, Connon CJ, Alves WA, Hamley IW. Self-Assembled Arginine-Capped Peptide Bolaamphiphile Nanosheets for Cell Culture and Controlled Wettability Surfaces. Biomacromolecules 2015; 16:3180-90. [DOI: 10.1021/acs.biomac.5b00820] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Emerson Rodrigo da Silva
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Merlin Nathaniel Mark Walter
- Institute
of Genetic Medicine, Newcastle University, International Centre for Life, Central Parkway, Newcastle upon Tyne NE1 3BZ, United Kingdom
| | - Mehedi Reza
- Department
of Applied Physics, Aalto University School of Science, P.O. Box 15100, FI-00076 Aalto, Finland
| | - Valeria Castelletto
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Janne Ruokolainen
- Department
of Applied Physics, Aalto University School of Science, P.O. Box 15100, FI-00076 Aalto, Finland
| | - Che John Connon
- Institute
of Genetic Medicine, Newcastle University, International Centre for Life, Central Parkway, Newcastle upon Tyne NE1 3BZ, United Kingdom
| | - Wendel Andrade Alves
- Centro
de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | - Ian William Hamley
- Department
of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
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137
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Dettin M, Zamuner A, Roso M, Gloria A, Iucci G, Messina GML, D'Amora U, Marletta G, Modesti M, Castagliuolo I, Brun P. Electrospun Scaffolds for Osteoblast Cells: Peptide-Induced Concentration-Dependent Improvements of Polycaprolactone. PLoS One 2015; 10:e0137505. [PMID: 26361004 PMCID: PMC4567138 DOI: 10.1371/journal.pone.0137505] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Accepted: 08/18/2015] [Indexed: 11/18/2022] Open
Abstract
The design of hybrid poly-ε-caprolactone (PCL)-self-assembling peptides (SAPs) matrices represents a simple method for the surface functionalization of synthetic scaffolds, which is essential for cell compatibility. This study investigates the influence of increasing concentrations (2.5%, 5%, 10% and 15% w/w SAP compared to PCL) of three different SAPs on the physico-chemical/mechanical and biological properties of PCL fibers. We demonstrated that physico-chemical surface characteristics were slightly improved at increasing SAP concentrations: the fiber diameter increased; surface wettability increased with the first SAP addition (2.5%) and slightly less for the following ones; SAP-surface density increased but no change in the conformation was registered. These results could allow engineering matrices with structural characteristics and desired wettability according to the needs and the cell system used. The biological and mechanical characteristics of these scaffolds showed a particular trend at increasing SAP concentrations suggesting a prevailing correlation between cell behavior and mechanical features of the matrices. As compared with bare PCL, SAP enrichment increased the number of metabolic active h-osteoblast cells, fostered the expression of specific osteoblast-related mRNA transcripts, and guided calcium deposition, revealing the potential application of PCL-SAP scaffolds for the maintenance of osteoblast phenotype.
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Affiliation(s)
- Monica Dettin
- Department of Industrial Engineering, University of Padova, Padova, Italy
- * E-mail:
| | - Annj Zamuner
- Department of Industrial Engineering, University of Padova, Padova, Italy
| | - Martina Roso
- Department of Industrial Engineering, University of Padova, Padova, Italy
| | - Antonio Gloria
- Institute of Polymers, Composites and Biomaterials—National Research Council of Italy, Naples, Italy
| | - Giovanna Iucci
- Department of Physics, University “Roma Tre”, Roma, Italy
| | | | - Ugo D'Amora
- Institute of Polymers, Composites and Biomaterials—National Research Council of Italy, Naples, Italy
| | | | - Michele Modesti
- Department of Industrial Engineering, University of Padova, Padova, Italy
| | | | - Paola Brun
- Department of Molecular Medicine, University of Padova, Padova, Italy
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138
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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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139
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Branca C, Wanderlingh U, D'Angelo G, Crupi C, Rifici S. Study of the dynamical behavior of sodium alginate/myoglobin aqueous solutions: A dynamic light scattering study. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.06.002] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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140
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Wang Y, Qi W, Huang R, Yang X, Wang M, Su R, He Z. Rational Design of Chiral Nanostructures from Self-Assembly of a Ferrocene-Modified Dipeptide. J Am Chem Soc 2015; 137:7869-80. [PMID: 26018930 DOI: 10.1021/jacs.5b03925] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
We report a new paradigm for the rational design of chiral nanostructures that is based on the hierarchical self-assembly of a ferrocene (Fc)-modified dipeptide, ferrocene-L-Phe-L-Phe-OH (Fc-FF). Compared to other chiral self-assembling systems, Fc-FF is unique because of its smaller size, biocompatibility, multiple functions (a redox center), and environmental responsiveness. X-ray and spectroscopic analyses showed that the incorporation of counterions during the hierarchical self-assembly of Fc-FF changed the conformations of the secondary structures from flat β sheets into twisted β sheets. This approach enables chiral self-assembly and the formation of well-defined chiral nanostructures composed of helical twisted β sheets. We identified two elementary forms for the helical twist of the β sheets, which allowed us to create a rich variety of rigid chiral nanostructures over a wide range of scales. Furthermore, through subtle modulations in the counterions, temperature, and solvent, we are able to precisely control the helical pitch, diameter, and handedness of the self-assembled chiral nanostructures. This unprecedented level of control not only offers insights into how rationally designed chiral nanostructures can be formed from simple molecular building blocks but also is of significant practical value for the use in chiroptics, templates, chiral sensing, and separations.
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Affiliation(s)
| | - Wei Qi
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China.,∥Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China
| | | | | | - Mengfan Wang
- ∥Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China
| | - Rongxin Su
- §Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300072, PR China.,∥Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, PR China
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141
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Suwal S, Roblet C, Amiot J, Bazinet L. Presence of free amino acids in protein hydrolysate during electroseparation of peptides: Impact on system efficiency and membrane physicochemical properties. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2015.04.014] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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142
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Louros NN, Tsiolaki PL, Zompra AA, Pappa EV, Magafa V, Pairas G, Cordopatis P, Cheimonidou C, Trougakos IP, Iconomidou VA, Hamodrakas SJ. Structural studies and cytotoxicity assays of “aggregation-prone” IAPP8-16and its non-amyloidogenic variants suggest its important role in fibrillogenesis and cytotoxicity of human amylin. Biopolymers 2015; 104:196-205. [DOI: 10.1002/bip.22650] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2014] [Revised: 03/10/2015] [Accepted: 03/30/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Nikolaos N. Louros
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Paraskevi L. Tsiolaki
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | | | - Eleni V. Pappa
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - Vassiliki Magafa
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - George Pairas
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - Paul Cordopatis
- Department of Pharmacy; University of Patras; Patras 26504 Greece
| | - Christina Cheimonidou
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Ioannis P. Trougakos
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Vassiliki A. Iconomidou
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
| | - Stavros J. Hamodrakas
- Department of Cell Biology and Biophysics; Faculty of Biology, University of Athens; Panepistimiopolis Athens 157 01 Greece
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143
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Jones BH, Martinez AM, Wheeler JS, Spoerke ED. Surfactant-induced assembly of enzymatically-stable peptide hydrogels. SOFT MATTER 2015; 11:3572-3580. [PMID: 25853589 DOI: 10.1039/c5sm00522a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The secondary structure of peptides in the presence of interacting additives is an important topic of study, having implications in the application of peptide science to a broad range of modern technologies. Surfactants constitute a class of biologically relevant compounds that are known to influence both peptide conformation and aggregation or assembly. We have characterized the secondary structure of a linear nonapeptide composed of a hydrophobic alanine/phenylalanine core flanked by hydrophilic acid/amine units. We show that the anionic surfactant sodium dodecyl sulfate (SDS) induces the formation of β-sheets and macroscopic gelation in this otherwise unstructured peptide. Through comparison to related additives, we propose that SDS-induced secondary structure formation is the result of amphiphilicity created by electrostatic binding of SDS to the peptide. In addition, we demonstrate a novel utility of surfactants in manipulating and stabilizing peptide nanostructures. SDS is used to simultaneously induce secondary structure in a peptide and to inhibit the activity of a model enzyme, resulting in a peptide hydrogel that is impervious to enzymatic degradation. These results complement our understanding of the behavior of peptides in the presence of interacting secondary molecules and provide new potential pathways for programmable organization of peptides by the addition of such components.
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Affiliation(s)
- Brad H Jones
- Sandia National Laboratories, Electronic, Optical, and Nano Materials, PO Box 5800, MS 1411, Albuquerque, NM 87185, USA.
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144
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Dehsorkhi A, Gouveia RM, Smith AM, Hamley IW, Castelletto V, Connon CJ, Reza M, Ruokolainen J. Self-assembly of a dual functional bioactive peptide amphiphile incorporating both matrix metalloprotease substrate and cell adhesion motifs. SOFT MATTER 2015; 11:3115-3124. [PMID: 25779650 DOI: 10.1039/c5sm00459d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We describe a bioactive lipopeptide that combines the capacity to promote the adhesion and subsequent self-detachment of live cells, using template-cell-environment feedback interactions. This self-assembling peptide amphiphile comprises a diene-containing hexadecyl lipid chain (C16e) linked to a matrix metalloprotease-cleavable sequence, Thr-Pro-Gly-Pro-Gln-Gly-Ile-Ala-Gly-Gln, and contiguous with a cell-attachment and signalling motif, Arg-Gly-Asp-Ser. Biophysical characterisation revealed that the PA self-assembles into 3 nm diameter spherical micelles above a critical aggregation concentration (cac). In addition, when used in solution at 5-150 nM (well below the cac), the PA is capable of forming film coatings that provide a stable surface for human corneal fibroblasts to attach and grow. Furthermore, these coatings were demonstrated to be sensitive to metalloproteases expressed endogenously by the attached cells, and consequently to elicit the controlled detachment of cells without compromising their viability. As such, this material constitutes a novel class of multi-functional coating for both fundamental and clinical applications in tissue engineering.
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Affiliation(s)
- Ashkan Dehsorkhi
- School of Chemistry, Pharmacy and Food Biosciences, University of Reading, Whiteknights, Reading, RG6 6AD, UK.
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145
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Decandio CC, Silva ER, Hamley IW, Castelletto V, Liberato MS, Oliveira VX, Oliveira CLP, Alves WA. Self-Assembly of a Designed Alternating Arginine/Phenylalanine Oligopeptide. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4513-23. [PMID: 25823528 DOI: 10.1021/acs.langmuir.5b00253] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
Abstract
A model octapeptide peptide consisting of an alternating sequence of arginine (Arg) and phenylalanine (Phe) residues, namely, [Arg-Phe]4, was prepared, and its self-assembly in solution studied. The simple alternating [Arg-Phe]4 peptide sequence allows for unique insights into the aggregation process and the structure of the self-assembled motifs. Fluorescence and UV-vis assays were used to determine critical aggregation concentrations, corresponding to the formation of oligomeric species and β-sheet rich structures organized into both spheroidal aggregates and highly ordered fibrils. Electron and atomic force microscopy images show globular aggregates and long unbranched fibers with diameters ranging from ∼4 nm up to ∼40 nm. Infrared and circular dichroism spectroscopy show the formation of β-sheet structures. X-ray diffraction on oriented stalks show that the peptide fibers have an internal lamellar structure, with an orthorhombic unit cell with parameters a ∼ 27.6 Å, b ∼ 9.7 Å, and c ∼ 9.6 Å. In situ small-angle X-ray scattering (SAXS) shows the presence of low molecular weight oligomers in equilibrium with mature fibers which are likely made up from 5 or 6 intertwined protofilaments. Finally, weak gel solutions are probed under gentle shear, suggesting the ability of these arginine-rich fibers to form networks.
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Affiliation(s)
- Carla C Decandio
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | - Emerson R Silva
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
- ‡Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Ian W Hamley
- ‡Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Valeria Castelletto
- ‡Department of Chemistry, University of Reading, Whiteknights, Reading RG6 6AD, United Kingdom
| | - Michelle S Liberato
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | - Vani X Oliveira
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
| | | | - Wendel A Alves
- †Centro de Ciências Naturais e Humanas, Universidade Federal do ABC, Santo André 09210-580, Brazil
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146
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Yu L, Fu W, Li Z. Tuning the phase transition temperature of thermal-responsive OEGylated poly-L-glutamate via random copolymerization with L-alanine. SOFT MATTER 2015; 11:545-550. [PMID: 25420954 DOI: 10.1039/c4sm02270j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Two series of copolymers were prepared by ring-opening polymerization (ROP) of γ-(2-methoxyethoxy)esteryl-L-glutamate (L-EG2Glu) N-carboxyanhydride (NCA) and L-alanine (L-Ala) using HMDS and PEG-NH2 as initiator, respectively. Poly-(L-EG2Glu-co-L-Ala) displayed lower critical solution temperature (LCST) behavior but had a lower phase transition temperature than poly-L-EG2Glu at similar molecular weight (MW). The clouding point (CP) of random copolypeptides can be tuned by altering the alanine content and overall MW. Circular dichroism (CD) and Fourier transform infrared spectroscopy (FTIR) indicated that the thermal-responsive properties depended on the content of ordered conformations. PEG-b-poly-(L-EG2Glu-co-L-Ala) can spontaneously form hydrogels in water at room temperature. Transmission electron microscopy (TEM) and atomic force microscopy (AFM) revealed that these hydrogels were formed by nanoribbons. The intermolecular hydrogen bonding among copolypeptide blocks accounted for the nanoribbon assemblies and hydrogel network formation.
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Affiliation(s)
- Lei Yu
- Beijing National Laboratory for Molecular Science (BNLMS), Institute of Chemistry, Chinese Academy of Science, Beijing, 100190, China.
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147
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Pramanik A, Paikar A, Haldar D. Sonication-induced instant fibrillation and fluorescent labeling of tripeptide fibers. RSC Adv 2015. [DOI: 10.1039/c5ra07864d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A sonication-induced instant fibril formation technique has been used for the co-assembly and fluorescent labeling of peptide nanofibers with organic dyes.
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Affiliation(s)
- Apurba Pramanik
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
| | - Arpita Paikar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
| | - Debasish Haldar
- Department of Chemical Sciences
- Indian Institute of Science Education and Research Kolkata
- Mohanpur
- India
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148
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Korkmaz F, Erdogan DA, Özalp-Yaman Ş. Interaction of a novel platinum drug with bovine serum albumin: FTIR and UV-Vis spectroscopy analysis. NEW J CHEM 2015. [DOI: 10.1039/c5nj00785b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Platinum-Blue docks at a hydrophobic cavity at low concentrations with a binding constant comparable to that of cisplatin.
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Affiliation(s)
- Filiz Korkmaz
- Atilim University
- Faculty of Engineering
- Biophysics Laboratory
- Ankara
- Turkey
| | - Deniz Altunoz Erdogan
- Atilim University
- Faculty of Engineering
- Department of Chemical Engineering and Applied Chemistry
- Ankara
- Turkey
| | - Şeniz Özalp-Yaman
- Atilim University
- Faculty of Engineering
- Department of Chemical Engineering and Applied Chemistry
- Ankara
- Turkey
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149
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150
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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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