1
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Keever JM, Banzon PD, Hales MK, Sargent AL, Allen WE. Association between N-Terminal Pyrenes Stabilizes the Collagen Triple Helix. J Org Chem 2023; 88:11885-11894. [PMID: 37531574 DOI: 10.1021/acs.joc.3c01175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
Collagen model peptides featuring the fluorophore pyrene at their N-termini have been synthesized, and their thermal denaturation has been examined using circular dichroism (CD) and fluorescence spectroscopies. Flanking the (Pro-Hyp-Gly)7 core of the peptide monomers at positions 1 and/or 23 in the primary sequence, Lys residues were introduced to ensure water solubility. Triple helices derived from such peptides show a broad excimer emission at ∼480 nm, indicative of interaction between the pyrene units. CD experiments show that the fluorophores enhance helix stability primarily through entropic effects. Unfolding temperatures (Tm) increase by up to 7 °C for systems with N-terminal lysine residues and by up to 21 °C for systems in which the first-position Lys is replaced by Ala. Tm values derived from fluorescence measurements (at 50 μM) typically lie within ∼1 °C of those obtained using CD (at 200 μM). Computational modeling in a water continuum using B3LYP-GD3 and M06-2X functionals predicts that face-to-face association of fluorophores can occur while H-bonding within the [(POG)n]3 assembly is retained. Such parallel stacking is consistent with hydrophobically driven stabilization. Labeling collagen peptides with pyrene is a synthetically simple way to promote triple helicity while providing a means to obtain Tm data on relatively dilute samples.
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Affiliation(s)
- Jared M Keever
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Patrick D Banzon
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Megan K Hales
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - Andrew L Sargent
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
| | - William E Allen
- Department of Chemistry, Science and Technology Building, East Carolina University, Greenville, North Carolina 27858-4353, United States
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2
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Forlano N, Bucci R, Contini A, Venanzi M, Placidi E, Gelmi ML, Lettieri R, Gatto E. Non-Conventional Peptide Self-Assembly into a Conductive Supramolecular Rope. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:nano13020333. [PMID: 36678086 PMCID: PMC9867255 DOI: 10.3390/nano13020333] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 01/09/2023] [Accepted: 01/10/2023] [Indexed: 05/27/2023]
Abstract
Structures composed of alternating α and β amino acids can give rise to peculiar secondary structural motifs, which could self-assemble into complex structures of controlled geometries. This work describes the self-assembly properties of an α,β-peptide, containing three units of syn H2-(2-F-Phe)-h-PheGly-OH, able to self-organize on surfaces into a fascinating supramolecular rope. This material was characterized by AFM, electronic conduction and fluorescence measurements. Molecular dynamics simulations showed that this hexapeptide can self-assemble into an antiparallel β-sheet layer, stabilized by intermolecular H-bonds, which, in turn, can self-assemble into many side-by-side layers, due to π-π interactions. As a matter of fact, we demonstrated that in this system, the presence of aromatic residues at the intramolecular interface promoted by the alternation of α,β-amino-acids in the primary sequence, endorses the formation of a super-secondary structure where the aromatic groups are close to each other, conferring to the system good electron conduction properties. This work demonstrates the capability and future potential of designing and fabricating distinctive nanostructures and efficient bioelectronic interfaces based on an α,β-peptide, by controlling structure and interaction processes beyond those obtained with α- or β-peptides alone.
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Affiliation(s)
- Nicola Forlano
- Department of Chemical Science and Technologies, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
| | - Raffaella Bucci
- Department of Pharmaceutical Sciences, University of Milan, Via Venezian 21, 20133 Milan, Italy
| | - Alessandro Contini
- Department of Pharmaceutical Sciences, University of Milan, Via Venezian 21, 20133 Milan, Italy
| | - Mariano Venanzi
- Department of Chemical Science and Technologies, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
| | - Ernesto Placidi
- Department of Physics, Sapienza University of Rome, P.le Aldo Moro 2, 00185 Rome, Italy
| | - Maria Luisa Gelmi
- Department of Pharmaceutical Sciences, University of Milan, Via Venezian 21, 20133 Milan, Italy
| | - Raffaella Lettieri
- Department of Chemical Science and Technologies, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
| | - Emanuela Gatto
- Department of Chemical Science and Technologies, University of Rome “Tor Vergata”, Via della Ricerca Scientifica, 00133 Roma, Italy
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3
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X de Andrade D, Colherinhas G. Polar Zipper on a Peptide Nanomembrane: A Characterization by Potential of Mean Force. J Phys Chem B 2023; 127:228-235. [PMID: 36548131 DOI: 10.1021/acs.jpcb.2c07135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
In this work, nanomembranes formed by the I3XGK (X = Q, S, or N) polar peptides are studied to characterize the average force and energy required to separate two neighboring β-sheets laterally joined by polar zippers. The results presented are obtained using a methodology (state of the art) involving the pulling umbrella method to generate the samples (umbrella sampling) and the potential of mean force (PMF) to evaluate the energetic variation evolved in the process of separating the polar zipper. It was observed that the maximum force required to separate the regions linked by polar zippers is 1.48 kJ/mol nm for the I3NGK nanomembrane and 1.22 kJ/mol nm [1.30 kJ/mol nm] for the I3QGK [I3SGK] nanomembranes, emphasizing that polar zippers play an important role in the interaction that interconnects β-sheets in broad and robust two-dimensional structures (tapes and membranes), offering an agile route to the construction of distinct nanomaterials from β-sheets. Also, negative values were obtained for energy as a function of the reaction coordinate for the regions where the formation of polar zippers occurs, showing that the lateral union of neighboring β-sheets is energetically favorable, with a value up to -3.0 kJ/mol, in the case of I3NGK nanomembranes.
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Affiliation(s)
- Douglas X de Andrade
- Instituto Federal de Educação, Ciência e Tecnologia de Goiás, Aparecida de Goiânia, GO74968-755, Brazil
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4
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Gatto E, Toniolo C, Venanzi M. Peptide Self-Assembled Nanostructures: From Models to Therapeutic Peptides. NANOMATERIALS 2022; 12:nano12030466. [PMID: 35159810 PMCID: PMC8838750 DOI: 10.3390/nano12030466] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 01/24/2022] [Accepted: 01/26/2022] [Indexed: 11/25/2022]
Abstract
Self-assembly is the most suitable approach to obtaining peptide-based materials on the nano- and mesoscopic scales. Applications span from peptide drugs for personalized therapy to light harvesting and electron conductive media for solar energy production and bioelectronics, respectively. In this study, we will discuss the self-assembly of selected model and bioactive peptides, in particular reviewing our recent work on the formation of peptide architectures of nano- and mesoscopic size in solution and on solid substrates. The hierarchical and cooperative characters of peptide self-assembly will be highlighted, focusing on the structural and dynamical properties of the peptide building blocks and on the nature of the intermolecular interactions driving the aggregation phenomena in a given environment. These results will pave the way for the understanding of the still-debated mechanism of action of an antimicrobial peptide (trichogin GA IV) and the pharmacokinetic properties of a peptide drug (semaglutide) currently in use for the therapy of type-II diabetes.
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Affiliation(s)
- Emanuela Gatto
- PEPSA-LAB, Department of Chemical Science and Technologies, University of Rome, Tor Vergata, 00133 Rome, Italy;
| | - Claudio Toniolo
- Department of Chemical Sciences, University of Padua, 35131 Padua, Italy;
| | - Mariano Venanzi
- PEPSA-LAB, Department of Chemical Science and Technologies, University of Rome, Tor Vergata, 00133 Rome, Italy;
- Correspondence: ; Tel.: +39-06-7259-4468
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5
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Misra R, Rudnick-Glick S, Adler-Abramovich L. From Folding to Assembly: Functional Supramolecular Architectures of Peptides Comprised of Non-Canonical Amino Acids. Macromol Biosci 2021; 21:e2100090. [PMID: 34142442 DOI: 10.1002/mabi.202100090] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 05/06/2021] [Indexed: 12/27/2022]
Abstract
The engineering of biological molecules is the fundamental concept behind the design of complex materials with desirable functions. Over the last few decades, peptides and proteins have emerged as useful building blocks for well-defined nanostructures with controlled size and dimensions. Short peptides in particular have received much attention due to their inherent biocompatibility, lower synthetic cost, and ease of tunability. In addition to the diverse self-assembling properties of short peptides comprising coded amino acids and their emerging applications in nanotechnology, there is now growing interest in the properties of peptides composed of non-canonical amino acids. Such non-natural oligomers have been shown in recent years to form well-defined secondary structures similar to natural proteins, with the ability to self-assemble to generate a wide variety of nanostructures with excellent biostability. This review describes recent events in the development of supramolecular assemblies of peptides composed completely of non-coded amino acids and their hybrid analogues. Special attention is paid to understanding the supramolecular assemblies at the atomic level and to considering their potential applications in nanotechnology.
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Affiliation(s)
- Rajkumar Misra
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine and the Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Safra Rudnick-Glick
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine and the Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv, 69978, Israel
| | - Lihi Adler-Abramovich
- Department of Oral Biology, The Goldschleger School of Dental Medicine, Sackler Faculty of Medicine and the Center for Nanoscience and Nanotechnology, Tel Aviv University, Tel Aviv, 69978, Israel
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6
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Savioli M, Antonelli L, Bocchinfuso G, Cavalieri F, Cimino R, Gatto E, Placidi E, Fernandez Masso JR, Garay Perez H, Santana H, Guerra-Vallespi M, Venanzi M. Formulation matters! A spectroscopic and molecular dynamics investigation on the peptide CIGB552 as itself and in its therapeutical formulation. J Pept Sci 2021; 28:e3356. [PMID: 34114297 DOI: 10.1002/psc.3356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2021] [Revised: 04/28/2021] [Accepted: 05/21/2021] [Indexed: 11/08/2022]
Abstract
Synthetic therapeutic peptides (STP) are intensively studied as new-generation drugs, characterized by high purity, biocompatibility, selectivity and stereochemical control. However, most of the studies are focussed on the bioactivity of STP without considering how the formulation actually used for therapy administration could alter the physico-chemical properties of the active principle. The aggregation properties of a 20-mer STP (Ac-His-Ala-Arg-Ile-Lys-D-Pro-Thr-Phe-Arg-Arg-D-Leu-Lys-Trp-Lys-Tyr-Lys-Gly-Lys-Phe-Trp-NH2 ), showing antitumor activity, were investigated by optical spectroscopy and atomic force microscopy imaging, as itself (CIGB552) and in its therapeutic formulation (CIGB552TF). It has found that the therapeutic formulation deeply affects the aggregation properties of the investigated peptide and the morphology of the aggregates formed on mica by deposition of CIGB552 and CIGB552TF millimolar solutions. Molecular dynamics simulations studied the first steps of CIGB552 aggregation under physiological ionic strength conditions (NaCl 150 mM), showing that peptide oligomers, from dimers to tetramers, are preferentially formed in this environment. Interestingly, cell viability assays performed on H-460 cell lines indicate a major antiproliferative activity of the peptide in its therapeutic formulation with respect to the peptide aqueous solution.
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Affiliation(s)
- Marco Savioli
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Lorenzo Antonelli
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Gianfranco Bocchinfuso
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Francesca Cavalieri
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy.,School of Science, RMIT University, Melbourne, Victoria, Australia
| | - Rita Cimino
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Emanuela Gatto
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
| | - Ernesto Placidi
- Department of Physics, University of Rome 'Sapienza', Rome, Italy
| | | | | | - Hector Santana
- Center for Genetic Engineering and Biotechnology, Havana, Cuba
| | | | - Mariano Venanzi
- PEPSA-LAB, Department of Chemical Sciences and Technology, University of Rome Tor Vergata, Rome, Italy
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7
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Mendanha K, Prado RC, Oliveira LBA, Colherinhas G. Molecular dynamic simulations, GIAO-NMR and TD-DFT spectroscopy analyze for zwitterionic isoleucine (ILE) N , 1 ≤ N ≤ 6, in water solution. J Comput Chem 2021; 42:344-357. [PMID: 33283895 DOI: 10.1002/jcc.26460] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Revised: 10/01/2020] [Accepted: 11/22/2020] [Indexed: 12/17/2022]
Abstract
In this article, we investigate the effects of the isoleucine (ILE)N amino acid chain growth, N = 1.0.6, the ILE conformational effect as well as the solvent presence on the electrical and magnetic spectroscopic properties when these compounds are in aqueous solution. Computational molecular dynamics simulations were performed to include the solvent medium and generate uncorrelated configurations involving solute-solvent structures. The charge point model for solvent was used to obtain the results for quantum mechanical calculation, in special DFT calculations, for (ILE)N structures. Our results for the magnetic shielding constant obtained via GIAO-DFT-NMR calculations show that there is evidence of a magnetic behavior that characterizes the number of peptide bonds and, therefore, how the N isoleucine polypeptide chain is composed. TD-DFT results also show an absorption band shift to larger wavelengths indicating a dependence on N growth.
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Affiliation(s)
- Karinna Mendanha
- Instituto de Física, Universidade Federal de Goiás, Goiás, Brazil
| | | | | | - Guilherme Colherinhas
- Instituto de Física, Universidade Federal de Goiás, Goiás, Brazil.,Departamento de Física, CEPAE, Universidade Federal de Goiás, Goiás, Brazil
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8
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Venanzi M, Savioli M, Cimino R, Gatto E, Palleschi A, Ripani G, Cicero D, Placidi E, Orvieto F, Bianchi E. A spectroscopic and molecular dynamics study on the aggregation process of a long-acting lipidated therapeutic peptide: the case of semaglutide. SOFT MATTER 2020; 16:10122-10131. [PMID: 32780784 DOI: 10.1039/d0sm01011a] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The aggregation properties of semaglutide, a lipidated peptide drug agonist of the Glucagon-like peptide 1 receptor recently approved for the treatment of type 2 diabetes, have been investigated by spectroscopic techniques (UV-Vis absorption, steady-state and time-resolved fluorescence, and electronic circular dichroism) and molecular dynamics simulations. We show that in the micromolar concentration region, in aqueous solution, semaglutide is present as monomeric and dimeric species, with a characteristic monomer-to-dimer transition occurring at around 20 μM. The lipid chain stabilizes a globular morphology of the monomer and dimer species, giving rise to a locally well-defined polar outer surface where the lipid and peptide portions are packed to each other. At very long times, these peptide clusters nucleate the growth of larger aggregates characterized by blue luminescence and a β-sheet arrangement of the peptide chains. The understanding of the oligomerization and aggregation potential of peptide candidates is key for the development of long acting and stable drugs.
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Affiliation(s)
- M Venanzi
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, Via Ricerca Scientifica, 1, 00133 Rome, Italy.
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9
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Andrade D, Colherinhas G. The influence of polar and non-polar interactions on the self-assembly of peptide nanomembranes and their applications: An atomistic study using classical molecular dynamics. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.114263] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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10
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Stefanelli M, Savioli M, Zurlo F, Magna G, Belviso S, Marsico G, Superchi S, Venanzi M, Di Natale C, Paolesse R, Monti D. Porphyrins Through the Looking Glass: Spectroscopic and Mechanistic Insights in Supramolecular Chirogenesis of New Self-Assembled Porphyrin Derivatives. Front Chem 2020; 8:587842. [PMID: 33195087 PMCID: PMC7593786 DOI: 10.3389/fchem.2020.587842] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 09/09/2020] [Indexed: 12/12/2022] Open
Abstract
The solvent driven aggregation of porphyrin derivatives, covalently linked to a L- or D-prolinate enantiomer, results in the stereospecific formation of species featuring remarkable supramolecular chirality, as a consequence of reading and amplification of the stereochemical information stored in the proline-appended group. Spectroscopic, kinetic, and topographic SEM studies gave important information on the aggregation processes, and on the structures of the final chiral architectures. The results obtained may be the seeds for the construction of stereoselective sensors aiming at the detection, for example, of novel emergent pollutants from agrochemical, food, and pharmaceutical industry.
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Affiliation(s)
- Manuela Stefanelli
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Marco Savioli
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Francesca Zurlo
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Gabriele Magna
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Sandra Belviso
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - Giulia Marsico
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - Stefano Superchi
- Department of Sciences, University of Basilicata, Potenza, Italy
| | - Mariano Venanzi
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Corrado Di Natale
- Department of Electronic Engineering, University of Rome Tor Vergata, Rome, Italy
| | - Roberto Paolesse
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy
| | - Donato Monti
- Department of Science and Chemical Technologies, University of Rome "Tor Vergata", Rome, Italy.,Department of Chemistry, University La Sapienza, Rome, Italy
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11
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A6H polypeptide membranes: Molecular dynamics simulation, GIAO-DFT-NMR and TD-DFT spectroscopy analysis. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113850] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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12
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De Zotti M, Corvi G, Gatto E, Di Napoli B, Mazzuca C, Palleschi A, Placidi E, Biondi B, Crisma M, Formaggio F, Toniolo C, Venanzi M. Controlling the Formation of Peptide Films: Fully Developed Helical Peptides are Required to Obtain a Homogenous Coating over a Large Area. Chempluschem 2020; 84:1688-1696. [PMID: 31943881 DOI: 10.1002/cplu.201900456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/18/2019] [Indexed: 01/17/2023]
Abstract
The influence of conformational dynamics on the self-assembly process of a conformationally constrained analogue of the natural antimicrobial peptide Trichogin GA IV was analysed by spectroscopic methods, microscopy imaging at nanometre resolution, and molecular dynamics simulations. The formation of peptide films at the air/water interface and their deposition on a graphite or a mica substrate were investigated. A combination of experimental evidence with molecular dynamics simulation was used to demonstrate that only the fully developed helical structure of the analogue promotes formation of ordered aggregates that nucleate the growth of micrometric rods, which give rise to homogenous coating over wide regions of the hydrophilic mica. This work proves the influence of helix flexibility on peptide self-organization and orientation on surfaces, key steps in the design of bioinspired organic/inorganic hybrid materials.
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Affiliation(s)
- Marta De Zotti
- Department of Chemistry, University of Padova, 35131, Padova, Italy
| | - Gabriele Corvi
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Emanuela Gatto
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Benedetta Di Napoli
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Claudia Mazzuca
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Antonio Palleschi
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
| | - Ernesto Placidi
- ISM Unit, CNR, Department of Physics, University of Rome Sapienza, 00185, Rome, Italy
| | - Barbara Biondi
- Institute of Biomolecular Chemistry, CNR, Padova Unit, Department of Chemistry, University of Padova, 35131, Padova, Italy
| | - Marco Crisma
- Institute of Biomolecular Chemistry, CNR, Padova Unit, Department of Chemistry, University of Padova, 35131, Padova, Italy
| | - Fernando Formaggio
- Department of Chemistry, University of Padova, 35131, Padova, Italy
- Institute of Biomolecular Chemistry, CNR, Padova Unit, Department of Chemistry, University of Padova, 35131, Padova, Italy
| | - Claudio Toniolo
- Department of Chemistry, University of Padova, 35131, Padova, Italy
- Institute of Biomolecular Chemistry, CNR, Padova Unit, Department of Chemistry, University of Padova, 35131, Padova, Italy
| | - Mariano Venanzi
- Department of Chemical Science and Technologies, University of Rome Tor Vergata, 00133, Rome, Italy
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13
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Cimino R, Grelloni E, Magna G, Monti D, Stefanelli M, Gatto E, Placidi E, Biscaglia F, Gobbo M, Venanzi M. Tuning the morphology of mesoscopic structures of porphyrin macrocycles functionalized by an antimicrobial peptide. J PORPHYR PHTHALOCYA 2020. [DOI: 10.1142/s1088424619502006] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The aggregation properties of two peptide–porphyrin conjugates were investigated by optical spectroscopy and microscopy imaging with nanometer resolution. Specifically, a tetraphenylporphyrin platform was functionalized by (L)-magainin, a 23-residue long antimicrobial peptide, and by a (L)-magainin analogue differing from the parent peptide by a single residue substitution, [Formula: see text] an Ala vs. Phe replacement in the position 5 of the peptide chain. Spectroscopic and microscopy results show that this single-site substitution has a small effect on the secondary structure attained by the two peptide analogues, but deeply affects the morphology of the mesoscopic structures deposited on hydrophilic mica from methanol/water solutions. In particular, only the Ala-substituted peptide-porphyrin conjugate was shown to be able to form micrometric fibrils, coating homogeneously a hydrophilic mica surface. These results pave the way for potential applications of porphyrin-peptide compounds in localized photodynamic therapy and for designing solid-state stereoselective sensors.
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Affiliation(s)
- Rita Cimino
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Elisa Grelloni
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Gabriele Magna
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Donato Monti
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Manuela Stefanelli
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Emanuela Gatto
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
| | - Ernesto Placidi
- Dept. of Physics, University of Rome ‘La Sapienza’, P.le Aldo Moro 5, 00185 Rome, Italy
| | - Francesca Biscaglia
- Dept. of Chemical Sciences, University of Padua, via F. Marzolo, 35131 Padua, Italy
| | - Marina Gobbo
- Dept. of Chemical Sciences, University of Padua, via F. Marzolo, 35131 Padua, Italy
| | - Mariano Venanzi
- Dept. of Chemical Science and Technologies, University of Rome Tor Vergata, via della Ricerca Scientifica 1, 00133 Rome, Italy
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14
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Anionic food color tartrazine enhances antibacterial efficacy of histatin-derived peptide DHVAR4 by fine-tuning its membrane activity. Q Rev Biophys 2020; 53:e5. [PMID: 32115014 DOI: 10.1017/s0033583520000013] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Here it is demonstrated how some anionic food additives commonly used in our diet, such as tartrazine (TZ), bind to DHVAR4, an antimicrobial peptide (AMP) derived from oral host defense peptides, resulting in significantly fostered toxic activity against both Gram-positive and Gram-negative bacteria, but not against mammalian cells. Biophysical studies on the DHVAR4-TZ interaction indicate that initially large, positively charged aggregates are formed, but in the presence of lipid bilayers, they rather associate with the membrane surface. In contrast to synergistic effects observed for mixed antibacterial compounds, this is a principally different mechanism, where TZ directly acts on the membrane-associated AMP promoting its biologically active helical conformation. Model vesicle studies show that compared to dye-free DHVAR4, peptide-TZ complexes are more prone to form H-bonds with the phosphate ester moiety of the bilayer head-group region resulting in more controlled bilayer fusion mechanism and concerted severe cell damage. AMPs are considered as promising compounds to combat formidable antibiotic-resistant bacterial infections; however, we know very little on their in vivo actions, especially on how they interact with other chemical agents. The current example illustrates how food dyes can modulate AMP activity, which is hoped to inspire improved therapies against microbial infections in the alimentary tract. Results also imply that the structure and function of natural AMPs could be manipulated by small compounds, which may also offer a new strategic concept for the future design of peptide-based antimicrobials.
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15
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16
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Kiran S, Dwivedi P, Khatik R, Hameed S, Dwivedi M, Huang F, Xu RX. Synthesis of a functionalized dipeptide for targeted delivery and pH-sensitive release of chemotherapeutics. Chem Commun (Camb) 2020; 56:285-288. [DOI: 10.1039/c9cc09131a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Design of pH-sensitive folic acid conjugated diphenyl peptide nanoparticles for targeted folate receptors mediated endocytosis.
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Affiliation(s)
- Sonia Kiran
- Hefei National Laboratory of Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- China
| | - Pankaj Dwivedi
- School of Engineering Science
- Department of Precision Machinery and Precision Instrumentation
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Renuka Khatik
- Hefei National Laboratory of Physical Sciences at Microscale
- Department of Chemistry
- University of Science and Technology of China
- Hefei
- China
| | - Sadaf Hameed
- Department of Biomedical Engineering
- College of Engineering
- Peking University
- Beijing 100871
- China
| | - Monika Dwivedi
- School of Engineering Science
- Department of Precision Machinery and Precision Instrumentation
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Fangsheng Huang
- School of Engineering Science
- Department of Precision Machinery and Precision Instrumentation
- University of Science and Technology of China
- Hefei
- P. R. China
| | - Ronald X. Xu
- School of Engineering Science
- Department of Precision Machinery and Precision Instrumentation
- University of Science and Technology of China
- Hefei
- P. R. China
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17
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Mazzuca C, Di Napoli B, Biscaglia F, Ripani G, Rajendran S, Braga A, Benna C, Mocellin S, Gobbo M, Meneghetti M, Palleschi A. Understanding the good and poor cell targeting activity of gold nanostructures functionalized with molecular units for the epidermal growth factor receptor. NANOSCALE ADVANCES 2019; 1:1970-1979. [PMID: 36134223 PMCID: PMC9417547 DOI: 10.1039/c9na00096h] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2019] [Accepted: 03/29/2019] [Indexed: 05/21/2023]
Abstract
Nanostructures can strongly interact with cells or other biological structures; furthermore when they are functionalized with targeting units, they are of great interest for a variety of applications in the biotechnology field like those for efficient imaging, diagnosis and therapy and in particular for cancer theranostics. Obtaining targeting with good specificity and sensitivity is a key necessity, which, however, is affected by the complexity of the interactions between the nanostructures and the biological components. In this work we report the study of specificity and sensitivity of gold nanoparticles functionalized with the peptide GE11 for the targeting of the epidermal growth factor receptor, expressed on many cells and, in particular, on many types of cancer cells. We show how a combination of spectroscopic measurements and molecular dynamics simulations allows the comprehension of the targeting activity of peptides linked to the surface of gold nanostructures and how the targeting is tuned by the presence of polyethylene glycol chains.
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Affiliation(s)
- Claudia Mazzuca
- Department of Chemical Science and Technology, University of Rome "Tor Vergata" and CSGI Unit Via della Ricerca Scientifica 00133 Rome Italy
| | - Benedetta Di Napoli
- Department of Chemical Science and Technology, University of Rome "Tor Vergata" and CSGI Unit Via della Ricerca Scientifica 00133 Rome Italy
| | - Francesca Biscaglia
- Department of Chemical Sciences, University of Padova Via Marzolo 1 35131 Padova Italy
| | - Giorgio Ripani
- Department of Chemical Science and Technology, University of Rome "Tor Vergata" and CSGI Unit Via della Ricerca Scientifica 00133 Rome Italy
| | - Senthilkumar Rajendran
- Department of Surgery, Oncology and Gastroenterology, University of Padova Via Giustiniani, 2 35124 Padova Italy
| | - Andrea Braga
- Department of Chemical Sciences, University of Padova Via Marzolo 1 35131 Padova Italy
| | - Clara Benna
- Department of Surgery, Oncology and Gastroenterology, University of Padova Via Giustiniani, 2 35124 Padova Italy
| | - Simone Mocellin
- Department of Surgery, Oncology and Gastroenterology, University of Padova Via Giustiniani, 2 35124 Padova Italy
- Veneto Institute of Oncology IOV-IRCCS Via Gattamelata, 64 35128 Padova Italy
| | - Marina Gobbo
- Department of Chemical Sciences, University of Padova Via Marzolo 1 35131 Padova Italy
| | - Moreno Meneghetti
- Department of Chemical Sciences, University of Padova Via Marzolo 1 35131 Padova Italy
| | - Antonio Palleschi
- Department of Chemical Science and Technology, University of Rome "Tor Vergata" and CSGI Unit Via della Ricerca Scientifica 00133 Rome Italy
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18
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Andrade D, Oliveira LBA, Colherinhas G. Elucidating NH2-I3V3A3G3K3-COOH and NH2-K3G3A3V3I3-COOH polypeptide membranes: A classical molecular dynamics study. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.02.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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19
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Zhang L, Xu J, Wang F, Ding Y, Wang T, Jin G, Martz M, Gui Z, Ouyang P, Chen P. Histidine-Rich Cell-Penetrating Peptide for Cancer Drug Delivery and Its Uptake Mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:3513-3523. [PMID: 30673275 DOI: 10.1021/acs.langmuir.8b03175] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
In this work, we report a drug delivery system based on the pH-responsive self-assembly and -disassembly behaviors of peptides. Here, a systematically designed histidine-rich lipidated peptide (NP1) is presented to encapsulate and deliver an anticancer drug ellipticine (EPT) into two model cells: non-small-cell lung carcinoma and Chinese hamster ovary cells. The mechanism of pH-responsive peptide self-assembly and -disassembly involved in the drug encapsulation and release process are extensively investigated. We found that NP1 could self-assemble as a spherical nanocomplex (diameter = 34.43 nm) in a neutral pH environment with EPT encapsulated and positively charged arginine amino acids aligned outward and EPT is released in an acidic environment due to the pH-triggered disassembly. Furthermore, the EPT-encapsulating peptide could achieve a mass loading ability of 18% (mass of loaded-EPT/mass of NP1) with optimization. More importantly, it is revealed that the positively charged arginine on the periphery of the NP1 peptides could greatly facilitate their direct translocation through the negatively charged plasma membrane via electrostatic interaction, instead of via endocytosis, which provides a more efficient uptake pathway.
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Affiliation(s)
- Lei Zhang
- College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing 211816 , China
- Sericultural Research Institute , Chinese Academy of Agricultural Sciences , Zhenjiang , Jiangsu 212018 , China
- College of Biotechnology , Jiangsu University of Science and Technology , Zhenjiang , Jiangsu 212018 , China
| | | | | | | | | | | | | | - Zhongzheng Gui
- Sericultural Research Institute , Chinese Academy of Agricultural Sciences , Zhenjiang , Jiangsu 212018 , China
- College of Biotechnology , Jiangsu University of Science and Technology , Zhenjiang , Jiangsu 212018 , China
| | - Pingkai Ouyang
- College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing 211816 , China
| | - P Chen
- College of Biotechnology and Pharmaceutical Engineering , Nanjing Tech University , Nanjing 211816 , China
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20
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Caruso M, Gatto E, Palleschi A, Morales P, Scarselli M, Casaluci S, Quatela A, Di Carlo A, Venanzi M. A bioinspired dye sensitized solar cell based on a rhodamine-functionalized peptide immobilized on nanocrystalline TiO 2. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2017.07.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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21
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Farrotti A, Conflitti P, Srivastava S, Ghosh JK, Palleschi A, Stella L, Bocchinfuso G. Molecular Dynamics Simulations of the Host Defense Peptide Temporin L and Its Q3K Derivative: An Atomic Level View from Aggregation in Water to Bilayer Perturbation. Molecules 2017; 22:molecules22071235. [PMID: 28737669 PMCID: PMC6152314 DOI: 10.3390/molecules22071235] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2017] [Revised: 07/20/2017] [Accepted: 07/20/2017] [Indexed: 12/03/2022] Open
Abstract
Temporin L (TempL) is a 13 residue Host Defense Peptide (HDP) isolated from the skin of frogs. It has a strong affinity for lipopolysaccharides (LPS), which is related to its high activity against Gram-negative bacteria and also to its strong tendency to neutralize the pro-inflammatory response caused by LPS release from inactivated bacteria. A designed analog with the Q3K substitution shows an enhancement in both these activities. In the present paper, Molecular Dynamics (MD) simulations have been used to investigate the origin of these improved properties. To this end, we have studied the behavior of the peptides both in water solution and in the presence of LPS lipid-A bilayers, demonstrating that the main effect through which the Q3K substitution improves the peptide activities is the destabilization of peptide aggregates in water.
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Affiliation(s)
- Andrea Farrotti
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Rome 00133, Italy.
| | - Paolo Conflitti
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Rome 00133, Italy.
| | - Saurabh Srivastava
- Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
| | - Jimut Kanti Ghosh
- Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension, Sitapur Road, Lucknow 226031, India.
| | - Antonio Palleschi
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Rome 00133, Italy.
| | - Lorenzo Stella
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Rome 00133, Italy.
| | - Gianfranco Bocchinfuso
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma "Tor Vergata", Rome 00133, Italy.
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Venanzi M, Gatto E, Formaggio F, Toniolo C. The importance of being Aib. Aggregation and self-assembly studies on conformationally constrained oligopeptides. J Pept Sci 2017; 23:104-116. [DOI: 10.1002/psc.2956] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/30/2016] [Accepted: 12/01/2016] [Indexed: 12/23/2022]
Affiliation(s)
- Mariano Venanzi
- Department of Chemical Sciences and Technologies and Centre for Nanoscience, Nanotechnology and Advanced Instrumentation; University of Rome ‘Tor Vergata’; 00133 Rome Italy
| | - Emanuela Gatto
- Department of Chemical Sciences and Technologies and Centre for Nanoscience, Nanotechnology and Advanced Instrumentation; University of Rome ‘Tor Vergata’; 00133 Rome Italy
| | - Fernando Formaggio
- ICB, Padova Unit, CNR, Department of Chemistry; University of Padova; 35131 Padova Italy
| | - Claudio Toniolo
- ICB, Padova Unit, CNR, Department of Chemistry; University of Padova; 35131 Padova Italy
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23
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Konda M, Bhowmik S, Mobin SM, Biswas S, Das AK. Modulating Hydrogen Bonded Self-assembled Patterns and Morphological Features by a Change in Side Chain of Third Amino Acid of Synthetic γ- Amino Acid Based Tripeptides. ChemistrySelect 2016. [DOI: 10.1002/slct.201600557] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Maruthi Konda
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Soumitra Bhowmik
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Shaikh M. Mobin
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Sagar Biswas
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
| | - Apurba K. Das
- Department of Chemistry; Indian Institute of Technology Indore; Khandwa Road Indore 453552 India
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25
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Ruiz ED, Almada M, Burboa MG, Taboada P, Mosquera V, Valdez MA, Juárez J. Oligomers, protofibrils and amyloid fibrils from recombinant human lysozyme (rHL): fibrillation process and cytotoxicity evaluation for ARPE-19 cell line. Colloids Surf B Biointerfaces 2014; 126:335-43. [PMID: 25618793 DOI: 10.1016/j.colsurfb.2014.12.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Revised: 10/18/2014] [Accepted: 12/04/2014] [Indexed: 10/24/2022]
Abstract
Amyloid-associated diseases, such Alzheimer's, Huntington's, Parkinson's, and type II diabetes, are related to protein misfolding and aggregation. Herein, the time evolution of scattered light intensity, hydrophobic properties, and conformational changes during fibrillation processes of rHL solutions at 55 °C and pH 2.0 were used to monitor the aggregation process of recombinant human lysozyme (rHL). Dynamic light scattering (DLS), thioflavin T (ThT) fluorescence, and surface tension (ST) at the air-water interface were used to analyze the hydrophobic properties of pre-amyloid aggregates involved in the fibrillation process of rHL to find a correlation between the hydrophobic character of oligomers, protofibrils and amyloid aggregates with the gain in cross-β-sheet structure, depending on the increase in the incubation periods. The ability of the different aggregates of rHL isolated during the fibrillation process to be adsorbed at the air-water interface can provide important information about the hydrophobic properties of the protein, which can be related to changes in the secondary structure of rHL, resulting in cytotoxic or non-cytotoxic species. Thus, we evaluated the cytotoxic effect of oligomers, protofibrils and amyloid fibrils on the cell line ARPE-19 using the MTT reduction test. The more cytotoxic protein species arose after a 600-min incubation time, suggesting that the hydrophobic character of pre-amyloid fibrils, in addition to the high prevalence of the cross-β-sheet conformation, can become toxic for the cell line ARPE-19.
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Affiliation(s)
- Eva D Ruiz
- Departamento de Física, Universidad de Sonora, Rosales y Transversal, 83000 Hermosillo, Sonora, Mexico
| | - Mario Almada
- Departamento de Física, Universidad de Sonora, Rosales y Transversal, 83000 Hermosillo, Sonora, Mexico
| | - María G Burboa
- Departamento de Investigaciones Científicas y Tecnológicas, Universidad de Sonora, Rosales y Transversal, 83000 Hermosillo, Sonora, Mexico
| | - Pablo Taboada
- Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain
| | - Víctor Mosquera
- Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela, Spain
| | - Miguel A Valdez
- Departamento de Física, Universidad de Sonora, Rosales y Transversal, 83000 Hermosillo, Sonora, Mexico
| | - Josué Juárez
- Departamento de Física, Universidad de Sonora, Rosales y Transversal, 83000 Hermosillo, Sonora, Mexico.
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26
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Colherinhas G, Fileti E. Molecular dynamics study of surfactant-like peptide based nanostructures. J Phys Chem B 2014; 118:12215-22. [PMID: 25264942 DOI: 10.1021/jp5082593] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Surfactant-like peptide (SLP) based nanostructures are investigated using all-atomistic molecular dynamics (MD) simulations. We report structure properties of nanostructures belonging to the ANK peptide group. In particular, the mathematical models for the two A3K membranes, A6K nanotube, and A9K nanorod were developed. Our MD simulation results are consistent with the experimental data, indicating that A3K membranes are stable in two different configurations: (1) SLPs are tilted relative to the normal membrane plane; (2) SLPs are interdigitated. The former configuration is energetically more stable. The cylindrical nanostructures feature a certain order of the A6K peptides. In turn, the A9K nanorod does not exhibit any long-range ordering. Both nanotube and nanorod structure contain large amounts of water inside. Consequently, these nanostructures behave similar to hydrogels. This property may be important in the context of biotechnology. Binding energy analysis-in terms of Coulomb and van der Waals contributions-unveils an increase as the peptide size increases. The electrostatic interaction constitutes 70-75% of the noncovalent attraction energy between SLPs. The nanotubular structures are notably stable, confirming that A6K peptides preferentially form nanotubes and A9K peptides preferentially form nanorods.
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Affiliation(s)
- Guilherme Colherinhas
- Departamento de Física, CEPAE, Universidade Federal de Goiás , CP. 131, 74001-970, Goiânia, GO, Brazil
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27
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Bocchinfuso G, Conflitti P, Raniolo S, Caruso M, Mazzuca C, Gatto E, Placidi E, Formaggio F, Toniolo C, Venanzi M, Palleschi A. Aggregation propensity of Aib homo-peptides of different length: an insight from molecular dynamics simulations. J Pept Sci 2014; 20:494-507. [DOI: 10.1002/psc.2648] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 04/16/2014] [Accepted: 04/16/2014] [Indexed: 12/18/2022]
Affiliation(s)
- Gianfranco Bocchinfuso
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Paolo Conflitti
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Stefano Raniolo
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Mario Caruso
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Claudia Mazzuca
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Emanuela Gatto
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Ernesto Placidi
- Department of Physics; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
- CNR-ISM; Via Fosso del Cavaliere 100 I-00133 Roma Italy
| | - Fernando Formaggio
- Institute of Biomolecular Chemistry, Padova Unit, CNR, Department of Chemistry; University of Padova; I-35131 Padua Italy
| | - Claudio Toniolo
- Institute of Biomolecular Chemistry, Padova Unit, CNR, Department of Chemistry; University of Padova; I-35131 Padua Italy
| | - Mariano Venanzi
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
| | - Antonio Palleschi
- Department of Chemical Sciences and Technologies; University of Rome ‘Tor Vergata’; I-00133 Rome Italy
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28
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Caruso M, Gatto E, Placidi E, Ballano G, Formaggio F, Toniolo C, Zanuy D, Alemán C, Venanzi M. A single-residue substitution inhibits fibrillization of Ala-based pentapeptides. A spectroscopic and molecular dynamics investigation. SOFT MATTER 2014; 10:2508-2519. [PMID: 24647758 DOI: 10.1039/c3sm52831f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The aggregation properties of two Ala-based pentapeptides were investigated by spectroscopic techniques and molecular dynamics (MD) simulations. The two peptides, both functionalized at the N-terminus with a pyrenyl group, differ in the insertion of an α-aminoisobutyric acid residue at position 4. We showed that this single modification of the homo-peptide sequence inhibits the aggregation of the pentapeptide in aqueous solutions. Atomic force microscopy imaging revealed that the two peptides form mesoscopic aggregates of very different morphologies when deposited on mica. MD experiments showed that the two peptides have a very different propensity to form β-pleated sheet structures, as confirmed by our spectroscopic measurements. The implications of these findings for our understanding of the mechanism leading to the formation of amyloid structures, primary responsible for numerous neurodegenerative diseases, are also discussed.
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Affiliation(s)
- Mario Caruso
- Department of Chemical Sciences and Technologies, University of Rome "Tor Vergata", 00133 Rome, Italy.
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