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Willardiine and Its Synthetic Analogues: Biological Aspects and Implications in Peptide Chemistry of This Nucleobase Amino Acid. Pharmaceuticals (Basel) 2022; 15:ph15101243. [PMID: 36297355 PMCID: PMC9611319 DOI: 10.3390/ph15101243] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 09/27/2022] [Accepted: 09/28/2022] [Indexed: 12/16/2022] Open
Abstract
Willardiine is a nonprotein amino acid containing uracil, and thus classified as nucleobase amino acid or nucleoamino acid, that together with isowillardiine forms the family of uracilylalanines isolated more than six decades ago in higher plants. Willardiine acts as a partial agonist of ionotropic glutamate receptors and more in particular it agonizes the non-N-methyl-D-aspartate (non-NMDA) receptors of L-glutamate: ie. the α-amino-3-hydroxy-5-methyl-4-isoxazole-propionic acid (AMPA) and kainate receptors. Several analogues and derivatives of willardiine have been synthesised in the laboratory in the last decades and these compounds show different binding affinities for the non-NMDA receptors. More in detail, the willardiine analogues have been employed not only in the investigation of the structure of AMPA and kainate receptors, but also to evaluate the effects of receptor activation in the various brain regions. Remarkably, there are a number of neurological diseases determined by alterations in glutamate signaling, and thus, ligands for AMPA and kainate receptors deserve attention as potential neurodrugs. In fact, similar to willardiine its analogues often act as agonists of AMPA and kainate receptors. A particular importance should be recognized to willardiine and its thymine-based analogue AlaT also in the peptide chemistry field. In fact, besides the naturally-occurring short nucleopeptides isolated from plant sources, there are different examples in which this class of nucleoamino acids was investigated for nucleopeptide development. The applications are various ranging from the realization of nucleopeptide/DNA chimeras for diagnostic applications, and nucleoamino acid derivatization of proteins for facilitating protein-nucleic acid interaction, to nucleopeptide-nucleopeptide molecular recognition for nanotechnological applications. All the above aspects on both chemistry and biotechnological applications of willardine/willardine-analogues and nucleopeptide will be reviewed in this work.
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Greco F, Falanga AP, Terracciano M, D’Ambrosio C, Piccialli G, Oliviero G, Roviello GN, Borbone N. CD, UV, and In Silico Insights on the Effect of 1,3-Bis(1'-uracilyl)-2-propanone on Serum Albumin Structure. Biomolecules 2022; 12:1071. [PMID: 36008965 PMCID: PMC9405946 DOI: 10.3390/biom12081071] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 07/29/2022] [Indexed: 02/04/2023] Open
Abstract
1,3-diaryl-2-propanone derivatives are synthetic compounds used as building blocks for the realization not only of antimicrobial drugs but also of new nanomaterials thanks to their ability to self-assemble in solution and interact with nucleopeptides. However, their ability to interact with proteins is a scarcely investigated theme considering the therapeutic importance that 1,3-diaryl-2-propanones could have in the modulation of protein-driven processes. Within this scope, we investigated the protein binding ability of 1,3-bis(1'-uracilyl)-2-propanone, which was previously synthesized in our laboratory utilizing a Dakin-West reaction and herein indicated as U2O, using bovine serum albumin (BSA) as the model protein. Through circular dichroism (CD) and UV spectroscopy, we demonstrated that the compound, but not the similar thymine derivative T2O, was able to alter the secondary structure of the serum albumin leading to significant consequences in terms of BSA structure with respect to the unbound protein (Δβ-turn + Δβ-sheet = +23.6%, Δα = -16.7%) as revealed in our CD binding studies. Moreover, molecular docking studies suggested that U2O is preferentially housed in the domain IIIB of the protein, and its affinity for the albumin is higher than that of the reference ligand HA 14-1 (HDOCK score (top 1-3 poses): -157.11 ± 1.38 (U2O); -129.80 ± 6.92 (HA 14-1); binding energy: -7.6 kcal/mol (U2O); -5.9 kcal/mol (HA 14-1)) and T2O (HDOCK score (top 1-3 poses): -149.93 ± 2.35; binding energy: -7.0 kcal/mol). Overall, the above findings suggest the ability of 1,3-bis(1'-uracilyl)-2-propanone to bind serum albumins and the observed reduction of the α-helix structure with the concomitant increase in the β-structure are consistent with a partial protein destabilization due to the interaction with U2O.
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Affiliation(s)
- Francesca Greco
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy; (F.G.); (A.P.F.); (M.T.); (C.D.); (G.P.); (N.B.)
| | - Andrea Patrizia Falanga
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy; (F.G.); (A.P.F.); (M.T.); (C.D.); (G.P.); (N.B.)
| | - Monica Terracciano
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy; (F.G.); (A.P.F.); (M.T.); (C.D.); (G.P.); (N.B.)
- Institute of Applied Sciences and Intelligent Systems “Eduardo Caianiello”, Italian National Council of Research (ISASI-CNR), Via Pietro Castellino 111, 80131 Naples, Italy
| | - Carlotta D’Ambrosio
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy; (F.G.); (A.P.F.); (M.T.); (C.D.); (G.P.); (N.B.)
| | - Gennaro Piccialli
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy; (F.G.); (A.P.F.); (M.T.); (C.D.); (G.P.); (N.B.)
- ISBE-IT, University of Naples Federico II, Corso Umberto I, 80138 Naples, Italy;
| | - Giorgia Oliviero
- ISBE-IT, University of Naples Federico II, Corso Umberto I, 80138 Naples, Italy;
- Department of Molecular Medicine and Medical Biotechnologies, University of Naples Federico II, Via Sergio Pansini 5, 80131 Naples, Italy
| | - Giovanni Nicola Roviello
- Institute of Biostructures and Bioimaging, Italian National Council for Research (IBB-CNR), Area di Ricerca Site and Headquarters, Via Pietro Castellino 111, 80131 Naples, Italy
| | - Nicola Borbone
- Department of Pharmacy, University of Naples Federico II, Via Domenico Montesano 49, 80131 Naples, Italy; (F.G.); (A.P.F.); (M.T.); (C.D.); (G.P.); (N.B.)
- Institute of Applied Sciences and Intelligent Systems “Eduardo Caianiello”, Italian National Council of Research (ISASI-CNR), Via Pietro Castellino 111, 80131 Naples, Italy
- ISBE-IT, University of Naples Federico II, Corso Umberto I, 80138 Naples, Italy;
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Nucleic Acids as Biotools at the Interface between Chemistry and Nanomedicine in the COVID-19 Era. Int J Mol Sci 2022; 23:ijms23084359. [PMID: 35457177 PMCID: PMC9031702 DOI: 10.3390/ijms23084359] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 04/11/2022] [Accepted: 04/12/2022] [Indexed: 02/07/2023] Open
Abstract
The recent development of mRNA vaccines against the SARS-CoV-2 infection has turned the spotlight on the potential of nucleic acids as innovative prophylactic agents and as diagnostic and therapeutic tools. Until now, their use has been severely limited by their reduced half-life in the biological environment and the difficulties related to their transport to target cells. These limiting aspects can now be overcome by resorting to chemical modifications in the drug and using appropriate nanocarriers, respectively. Oligonucleotides can interact with complementary sequences of nucleic acid targets, forming stable complexes and determining their loss of function. An alternative strategy uses nucleic acid aptamers that, like the antibodies, bind to specific proteins to modulate their activity. In this review, the authors will examine the recent literature on nucleic acids-based strategies in the COVID-19 era, focusing the attention on their applications for the prophylaxis of COVID-19, but also on antisense- and aptamer-based strategies directed to the diagnosis and therapy of the coronavirus pandemic.
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Farhan M, Rizvi A, Ahmad A, Aatif M, Alam MW, Hadi SM. Structure of Some Green Tea Catechins and the Availability of Intracellular Copper Influence Their Ability to Cause Selective Oxidative DNA Damage in Malignant Cells. Biomedicines 2022; 10:biomedicines10030664. [PMID: 35327466 PMCID: PMC8945203 DOI: 10.3390/biomedicines10030664] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2022] [Revised: 02/27/2022] [Accepted: 03/01/2022] [Indexed: 02/05/2023] Open
Abstract
The possible roles of elevated endogenous copper levels in malignant cells are becoming increasingly understood at a greater depth. Our laboratory has previously demonstrated that tea catechins have the ability to mobilize endogenous copper and undergo a Fenton-like reaction that can selectively damage cancer cells. In this communication, by using a diverse panel of malignant cell lines, we demonstrate that the ability of the catechin family [(−)-epigallocatechin-3-gallate (EGCG), (−)-epigallocatechin (EGC), (−)-epicatechin (EC), and (+)-catechin (C)] to induce apoptosis is dependent on their structure. We further confirm that reactive oxygen species (ROS) are the terminal effectors causing copper-mediated DNA damage. Our studies demonstrate the role of cellular copper transporters CTR1 and ATP7A in the survival dynamics of malignant cells post-EGCG exposure. The results, when considered together with our previous studies, highlight the critical role that copper dynamics and mobilization plays in cancer cells and paves the way for a better understanding of catechins as nutraceutical supplements for malignancies.
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Affiliation(s)
- Mohd Farhan
- Department of Basic Sciences, Preparatory Year Deanship, King Faisal University, Al-Ahsa 31982, Saudi Arabia
- Correspondence:
| | - Asim Rizvi
- Department of Kulliyat, Faculty of Unani Medicine, Aligarh Muslim University, Aligarh 202002, India;
| | - Aamir Ahmad
- Interim Translational Research Institute, Academic Health System, Hamad Medical Corporation, Doha 3050, Qatar;
| | - Mohammad Aatif
- Department of Public Health, College of Applied Medical Sciences, King Faisal University, Al-Ahsa 31982, Saudi Arabia;
| | - Mir Waqas Alam
- Department of Physics, College of Science, King Faisal University, Al-Ahsa 31982, Saudi Arabia;
| | - Sheikh Mumtaz Hadi
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, Aligarh 202002, India;
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Novel insights on nucleopeptide binding: A spectroscopic and in silico investigation on the interaction of a thymine-bearing tetrapeptide with a homoadenine DNA. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2021.117975] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Bernal-Chanchavac J, Al-Amin M, Stephanopoulos N. Nanoscale structures and materials from the self-assembly of polypeptides and DNA. Curr Top Med Chem 2021; 22:699-712. [PMID: 34911426 DOI: 10.2174/1568026621666211215142916] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 11/23/2021] [Accepted: 11/25/2021] [Indexed: 11/22/2022]
Abstract
The use of biological molecules with programmable self-assembly properties is an attractive route to functional nanomaterials. Proteins and peptides have been used extensively for these systems due to their biological relevance and large number of supramolecular motifs, but it is still difficult to build highly anisotropic and programmable nanostructures due to their high complexity. Oligonucleotides, by contrast, have the advantage of programmability and reliable assembly, but lack biological and chemical diversity. In this review, we discuss systems that merge protein or peptide self-assembly with the addressability of DNA. We outline the various self-assembly motifs used, the chemistry for linking polypeptides with DNA, and the resulting nanostructures that can be formed by the interplay of these two molecules. Finally, we close by suggesting some interesting future directions in hybrid polypeptide-DNA nanomaterials, and potential applications for these exciting hybrids.
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Affiliation(s)
- Julio Bernal-Chanchavac
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University, Tempe AZ 85251. United States
| | - Md Al-Amin
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University, Tempe AZ 85251. United States
| | - Nicholas Stephanopoulos
- Biodesign Center for Molecular Design and Biomimetics, Arizona State University, Tempe AZ 85251. United States
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Aggarwal R, Jain N, Sharma S, Kumar P, Dubey GP, Chugh H, Chandra R. Visible-light driven regioselective synthesis, characterization and binding studies of 2-aroyl-3-methyl-6,7-dihydro-5H-thiazolo[3,2-a]pyrimidines with DNA and BSA using biophysical and computational techniques. Sci Rep 2021; 11:22135. [PMID: 34764313 PMCID: PMC8586366 DOI: 10.1038/s41598-021-01037-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2021] [Accepted: 10/15/2021] [Indexed: 11/09/2022] Open
Abstract
In recent times, fused azaheterocycles emerged as impressive therapeutic agents. Binding studies of such azaheterocycles with biomolecules is an important subject for pharmaceutical and biochemical studies aiming at the design and development of new drugs. Fused heterocyclic scaffolds, such as thiazolopyrmidines have long been used in the pharmaceutical industry for the treatment of various diseases. In this study, we have accomplished a regioselective synthesis of 2-aroyl-3-methyl-6,7-dihydro-5H-thiazolo[3,2-a]pyrimidines by the reaction of tetrahydropyrimidine-2(H)-thione with α-bromo-1,3-diketones, generated in situ from 1,3-diketones and NBS, using visible light as an inexpensive, green and renewable energy source under mild reaction conditions with wide-ranging substrate scope. The regioisomer was characterized unambiguously by 2D-NMR [1H-13C] HMBC and [1H-13C] HMQC spectroscopy. In silico toxicity data analysis showed the low toxicity risks of the synthesized compounds. Computational molecular docking studies were carried out to examine the interaction of thiazolo[3,2-a]pyrimidines with calf-thymus DNA (ct-DNA) and Bovine Serum Albumin (BSA). Moreover, different spectroscopic approaches viz. steady-state fluorescence, competitive displacement assay, UV-visible and circular dichroism (CD) along with viscosity measurements were employed to investigate the binding mechanisms of thiazolo[3,2-a]pyrimidines with DNA and BSA. The results thus obtained revealed that thiazolo[3,2-a]pyrimidines offer groove bindings with DNA and showed moderate bindings with BSA.
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Affiliation(s)
- Ranjana Aggarwal
- Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana, 136119, India.
- Council of Scientific and Industrial Research, National Institute of Science Communication and Policy Research, New Delhi, 110012, India.
| | - Naman Jain
- Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana, 136119, India
| | - Shilpa Sharma
- Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana, 136119, India
| | - Prince Kumar
- Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana, 136119, India
| | - Gyan Prakash Dubey
- Department of Chemistry, Kurukshetra University, Kurukshetra, Haryana, 136119, India
| | - Heerak Chugh
- Department of Chemistry, University of Delhi, New Delhi, 110007, India
| | - Ramesh Chandra
- Department of Chemistry, University of Delhi, New Delhi, 110007, India
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Szymańska M, Pospieszna-Markiewicz I, Mańka M, Insińska-Rak M, Dutkiewicz G, Patroniak V, Fik-Jaskółka MA. Synthesis and Spectroscopic Investigations of Schiff Base Ligand and Its Bimetallic Ag(I) Complex as DNA and BSA Binders. Biomolecules 2021; 11:1449. [PMID: 34680081 PMCID: PMC8533391 DOI: 10.3390/biom11101449] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 09/24/2021] [Accepted: 09/29/2021] [Indexed: 01/20/2023] Open
Abstract
Generation of well-defined potential metallotherapeutics for cancer treatment, one of the most population-threatening diseases, is challenging and an active area of modern research in view of their unique properties and thus multiple possible pathways of action in cells. Specifically, Schiff base ligands were recognized as very promising building blocks for the construction of stable and active complexes of numerous geometries and topologies. Incorporation of Ag(I) ions allows for the formation of flat complexes with potential unoccupied coordination sites, thus giving rise to specific interactions between the metallotherapeutic and biomolecule of interest. Herein, we present the design, synthesis and characterization of new Schiff base ligand L and its Ag(I) bimetallic complex [Ag2L2]2+ with two planar moieties formed around the metal ions and connected through cyclohexane rings, confirmed by X-ray measurements. The compounds were described in context of their potential use as anticancer drugs through DNA and BSA binding pathways by several spectroscopic methods (CD, UV-Vis, fluorescence). We revealed that both, L and [Ag2L2]2+, interact with similar affinity with CT-DNA (Kb~106 M-1), while they differ in the type and strength of interactions with the model albumin-BSA. [Ag2L2]2+ binds BSA in both a dynamic and static manner with the Ksv = 8.8 × 104 M-1 in the Trp-134 and Trp-213 sites, whereas L interacts with BSA only dynamically (KSV = 2.4 × 104 M-1). This found further confirmation in the CD studies which revealed a reduction in α-helix content in the albumin of 16% in presence of [Ag2L2]2+.
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Affiliation(s)
- Martyna Szymańska
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
| | - Izabela Pospieszna-Markiewicz
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
| | - Martyna Mańka
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
| | - Małgorzata Insińska-Rak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
| | - Grzegorz Dutkiewicz
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
| | - Violetta Patroniak
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
| | - Marta A. Fik-Jaskółka
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland; (M.S.); (I.P.-M.); (M.M.); (M.I.-R.); (G.D.); (V.P.)
- Centre for Advanced Technology, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 10, 61-614 Poznań, Poland
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Scognamiglio PL, Platella C, Napolitano E, Musumeci D, Roviello GN. From Prebiotic Chemistry to Supramolecular Biomedical Materials: Exploring the Properties of Self-Assembling Nucleobase-Containing Peptides. Molecules 2021; 26:3558. [PMID: 34200901 PMCID: PMC8230524 DOI: 10.3390/molecules26123558] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2021] [Revised: 05/27/2021] [Accepted: 05/28/2021] [Indexed: 12/24/2022] Open
Abstract
Peptides and their synthetic analogs are a class of molecules with enormous relevance as therapeutics for their ability to interact with biomacromolecules like nucleic acids and proteins, potentially interfering with biological pathways often involved in the onset and progression of pathologies of high social impact. Nucleobase-bearing peptides (nucleopeptides) and pseudopeptides (PNAs) offer further interesting possibilities related to their nucleobase-decorated nature for diagnostic and therapeutic applications, thanks to their reported ability to target complementary DNA and RNA strands. In addition, these chimeric compounds are endowed with intriguing self-assembling properties, which are at the heart of their investigation as self-replicating materials in prebiotic chemistry, as well as their application as constituents of innovative drug delivery systems and, more generally, as novel nanomaterials to be employed in biomedicine. Herein we describe the properties of nucleopeptides, PNAs and related supramolecular systems, and summarize some of the most relevant applications of these systems.
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Affiliation(s)
| | - Chiara Platella
- Department of Chemical Sciences, University of Naples Federico II, via Cintia 21, I-80126 Naples, Italy; (C.P.); (E.N.); (D.M.)
| | - Ettore Napolitano
- Department of Chemical Sciences, University of Naples Federico II, via Cintia 21, I-80126 Naples, Italy; (C.P.); (E.N.); (D.M.)
| | - Domenica Musumeci
- Department of Chemical Sciences, University of Naples Federico II, via Cintia 21, I-80126 Naples, Italy; (C.P.); (E.N.); (D.M.)
- Istituto di Biostrutture e Bioimmagini IBB-CNR, via Tommaso De Amicis 95, I-80145 Naples, Italy
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Plant isoquinoline alkaloids as potential neurodrugs: A comparative study of the effects of benzo[c]phenanthridine and berberine-based compounds on β-amyloid aggregation. Chem Biol Interact 2020; 334:109300. [PMID: 33098838 PMCID: PMC7577920 DOI: 10.1016/j.cbi.2020.109300] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/17/2020] [Accepted: 10/21/2020] [Indexed: 12/15/2022]
Abstract
Herein we present a comparative study of the effects of isoquinoline alkaloids belonging to benzo[c]phenanthridine and berberine families on β-amyloid aggregation. Results obtained using a Thioflavine T (ThT) fluorescence assay and circular dichroism (CD) spectroscopy suggested that the benzo[c]phenanthridine nucleus, present in both sanguinarine and chelerythrine molecules, was directly involved in an inhibitory effect of Aβ1-42 aggregation. Conversely, coralyne, that contains the isomeric berberine nucleus, significantly increased propensity for Aβ1-42 to aggregate. Surface Plasmon Resonance (SPR) experiments provided quantitative estimation of these interactions: coralyne bound to Aβ1-42 with an affinity (KD = 11.6 μM) higher than benzo[c]phenanthridines. Molecular docking studies confirmed that all three compounds are able to recognize Aβ1-42 in different aggregation forms suggesting their effective capacity to modulate the Aβ1-42 self-recognition mechanism. Molecular dynamics simulations indicated that coralyne increased the β-content of Aβ1-42, in early stages of aggregation, consistent with fluorescence-based promotion of the Aβ1-42 self-recognition mechanism by this alkaloid. At the same time, sanguinarine induced Aβ1-42 helical conformation corroborating its ability to delay aggregation as experimentally proved in vitro. The investigated compounds were shown to interfere with aggregation of Aβ1-42 demonstrating their potential as starting leads for the development of therapeutic strategies in neurodegenerative diseases.
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Roviello GN, Oliviero G, Di Napoli A, Borbone N, Piccialli G. Synthesis, self-assembly-behavior and biomolecular recognition properties of thyminyl dipeptides. ARAB J CHEM 2020. [DOI: 10.1016/j.arabjc.2018.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022] Open
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Musumeci D, Roviello V, Roviello GN. DNA- and RNA-binding ability of oligoDapT, a nucleobase-decorated peptide, for biomedical applications. Int J Nanomedicine 2018; 13:2613-2629. [PMID: 29750033 PMCID: PMC5936014 DOI: 10.2147/ijn.s156381] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Background Nucleobase-bearing peptides and their interaction with DNA and RNA are an important topic in the development of therapeutic approaches. On one hand, they are highly effective for modulating the nucleic-acid-based biological processes. On the other hand, they permit to overcome some of the main factors limiting the therapeutic efficacy of natural oligonucleotides, such as their rapid degradation by nucleases. Methods and results This article describes the synthesis and characterization of a novel thymine-bearing nucleoamino acid based on the l-diaminopropionic acid (l-Dap) and its solid phase oligomerization to α-peptides (oligoDapT), characterized using mass spectrometry, spectroscopic techniques, and scanning electron microscopy (SEM) analysis. The interaction of the obtained nucleopeptide with DNA and RNA model systems as both single strands (dA12, rA12, and poly(rA)) and duplex structures (dA12/dT12 and poly(rA)/poly(rU)) was investigated by means of circular dichroism (CD) and ultraviolet (UV) experiments. From the analysis of our data, a clear ability of the nucleopeptide to bind nucleic acids emerged, with oligoDapT being able to form stable complexes with both unpaired and double-stranded DNA and RNA. In particular, dramatic changes in the dA12/dT12 and poly(rA)/poly(rU) structures were observed as a consequence of the nucleopeptide binding. CD titrations revealed that multiple peptide units bound all the examined nucleic acid targets, with TLdap/A or TLdap/A:T(U) ratios >4 in case of oligoDapT/DNA and ~2 in oligoDapT/RNA complexes. Conclusion Our findings seem to indicate that Dap-based nucleopeptides are interesting nucleic acid binding-tools to be further explored with the aim to efficiently modulate DNA- and RNA-based biological processes.
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Affiliation(s)
- Domenica Musumeci
- CNR-Institute of Biostructure and Bioimaging, Naples, Italy.,Department of Chemical Sciences, University of Naples Federico II, Naples, Italy
| | - Valentina Roviello
- Analytical Chemistry for the Environment and Centro Servizi Metereologici Avanzati, University of Naples Federico II, Naples, Italy
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Russo A, Diaferia C, La Manna S, Giannini C, Sibillano T, Accardo A, Morelli G, Novellino E, Marasco D. Insights into amyloid-like aggregation of H2 region of the C-terminal domain of nucleophosmin. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2017; 1865:176-185. [DOI: 10.1016/j.bbapap.2016.11.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2016] [Revised: 10/29/2016] [Accepted: 11/14/2016] [Indexed: 01/21/2023]
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14
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Ma H, Guo C, Zhan Z, Lu G, Zhang Y, Luo X, Cui X, Huang G. Transition-metal-free oxidative intermolecular cyclization reaction: synthesis of 2-aryl-4-quinolones. NEW J CHEM 2017. [DOI: 10.1039/c7nj01293d] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, a novel and efficient intermolecular cyclization of 2-aminoacetophenones with aldehydes was developed for the synthesis of 2-aryl-4-quinolones through C–C and C–N bond formation.
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Affiliation(s)
- Haojie Ma
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Cui Guo
- Yanchuan County People's Hospital
- Yanchuan
- P. R. China
| | - Zhenzhen Zhan
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Guoqiang Lu
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - YiXin Zhang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Xinliang Luo
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - XinFeng Cui
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
| | - Guosheng Huang
- State Key Laboratory of Applied Organic Chemistry
- Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province
- Department of Chemistry
- Lanzhou University
- Lanzhou
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15
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Synthesis and biological evaluation of a novel Amadori compound. Amino Acids 2016; 49:327-335. [DOI: 10.1007/s00726-016-2363-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Accepted: 11/10/2016] [Indexed: 12/21/2022]
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16
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Roviello GN, Vicidomini C, Costanzo V, Roviello V. Nucleic acid binding and other biomedical properties of artificial oligolysines. Int J Nanomedicine 2016; 11:5897-5904. [PMID: 28115843 PMCID: PMC5108602 DOI: 10.2147/ijn.s121247] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
In the present study, we report the interaction of an artificial oligolysine (referred to as AOL) realized in our laboratory with targets of biomedical importance. These included polyinosinic acid (poly rI) and its complex with polycytidylic acid (poly I:C), RNAs with well-known interferon-inducing ability, and double-stranded (ds) DNA. The ability of the peptide to bind both single-stranded poly rI and ds poly I:C RNAs emerged from our circular dichroism (CD) and ultraviolet (UV) studies. In addition, we found that AOL forms complexes with dsDNA, as shown by spectroscopic binding assays and UV thermal denaturation experiments. These findings are encouraging for the possible use of AOL in biomedicine for nucleic acid targeting and oligonucleotide condensation, with the latter being a key step preceding their clinical application. Moreover, we tested the ability of AOL to bind to proteins, using serum albumin as a model protein. We demonstrated the oligolysine-protein binding by CD experiments which suggested that AOL, positively charged under physiological conditions, binds to the protein regions rich in anionic residues. Finally, the morphology characterization of the solid oligolysine, performed by scanning electron microscopy, showed different crystal forms including cubic-shaped crystals confirming the high purity of AOL.
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Affiliation(s)
- Giovanni N Roviello
- CNR Istituto di Biostrutture e Bioimmagini, Via Mezzocannone site and Headquarters
| | - Caterina Vicidomini
- CNR Istituto di Biostrutture e Bioimmagini, Via Mezzocannone site and Headquarters
| | - Vincenzo Costanzo
- CNR Istituto di Biostrutture e Bioimmagini, Via Mezzocannone site and Headquarters
| | - Valentina Roviello
- Centro Regionale di Competenza (CRdC) Tecnologie, Via Nuova Agnano, Napoli, Italy
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17
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Roviello GN, Vicidomini C, Di Gaetano S, Capasso D, Musumeci D, Roviello V. Solid phase synthesis and RNA-binding activity of an arginine-containing nucleopeptide. RSC Adv 2016; 6:14140-14148. [PMID: 29057071 PMCID: PMC5635565 DOI: 10.1039/c5ra25809j] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 01/15/2016] [Indexed: 01/22/2023] Open
Abstract
Here we report the solid phase synthesis and characterization (LC-ESIMS, CD) of a cationic nucleobase-containing α-peptide, composed of both l-arginine residues and l-lysine-based nucleoamino acids sequentially present in the structure. The binding properties of this novel basic nucleopeptide towards nucleic acids were investigated by CD spectroscopy which revealed the ability of the thymine-containing oligomer to bind both adenine-containing DNA (dA12) and RNA (poly rA) molecules inducing high conformational variations in the nucleic acid structures. Moreover, the artificial oligonucleotide inhibited the enzymatic activity of HIV reverse transcriptase, opening the door to the exploitation of novel antiviral strategies inspired to this molecular tool.
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Affiliation(s)
- G N Roviello
- CNR , Istituto di Biostrutture e Bioimmagini - (Mezzacannone site and Headquarters) , 80134 Napoli , Italy . ; ; Tel: +39-081-2534585
| | - C Vicidomini
- CNR , Istituto di Biostrutture e Bioimmagini - (Mezzacannone site and Headquarters) , 80134 Napoli , Italy . ; ; Tel: +39-081-2534585
| | - S Di Gaetano
- CNR , Istituto di Biostrutture e Bioimmagini - (Mezzacannone site and Headquarters) , 80134 Napoli , Italy . ; ; Tel: +39-081-2534585
| | - D Capasso
- Università di Napoli "Federico II" , Dipartimento di Farmacia , 80134 Napoli , Italy
| | - D Musumeci
- CNR , Istituto di Biostrutture e Bioimmagini - (Mezzacannone site and Headquarters) , 80134 Napoli , Italy . ; ; Tel: +39-081-2534585
- Università di Napoli "Federico II" , Dipartimento di Scienze Chimiche , 80126 Napoli , Italy
| | - V Roviello
- Università di Napoli "Federico II" , Dipartimento di Ingegneria Chimica , dei Materiali e della Produzione Industriale (DICMaPI) , 80125 Napoli , Italy
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18
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Qi L, Gundersen LL, Chamgordani EJ, Görbitz CH. Watson–Crick base pairing in 9-methyladenine and ethylene-9,9′-diadenine structures with close to 70% solvent content. CrystEngComm 2016. [DOI: 10.1039/c6ce01159d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Marasco D, Scognamiglio PL. Identification of inhibitors of biological interactions involving intrinsically disordered proteins. Int J Mol Sci 2015; 16:7394-412. [PMID: 25849651 PMCID: PMC4425024 DOI: 10.3390/ijms16047394] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 03/01/2015] [Accepted: 03/06/2015] [Indexed: 11/16/2022] Open
Abstract
Protein-protein interactions involving disordered partners have unique features and represent prominent targets in drug discovery processes. Intrinsically Disordered Proteins (IDPs) are involved in cellular regulation, signaling and control: they bind to multiple partners and these high-specificity/low-affinity interactions play crucial roles in many human diseases. Disordered regions, terminal tails and flexible linkers are particularly abundant in DNA-binding proteins and play crucial roles in the affinity and specificity of DNA recognizing processes. Protein complexes involving IDPs are short-lived and typically involve short amino acid stretches bearing few "hot spots", thus the identification of molecules able to modulate them can produce important lead compounds: in this scenario peptides and/or peptidomimetics, deriving from structure-based, combinatorial or protein dissection approaches, can play a key role as hit compounds. Here, we propose a panoramic review of the structural features of IDPs and how they regulate molecular recognition mechanisms focusing attention on recently reported drug-design strategies in the field of IDPs.
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Affiliation(s)
- Daniela Marasco
- Department of Pharmacy, Centro Interuniversitario di Ricerca sui Peptidi Bioattivi (CIRPEB), University of Naples "Federico II", DFM-Scarl, 80134 Naples, Italy.
| | - Pasqualina Liana Scognamiglio
- Department of Pharmacy, Centro Interuniversitario di Ricerca sui Peptidi Bioattivi (CIRPEB), University of Naples "Federico II", DFM-Scarl, 80134 Naples, Italy.
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20
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Roviello GN, Musumeci D, Roviello V. Cationic peptides as RNA compaction agents: a study on the polyA compaction activity of a linear alpha,epsilon-oligo-L-lysine. Int J Pharm 2015; 485:244-8. [PMID: 25772417 DOI: 10.1016/j.ijpharm.2015.03.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 03/05/2015] [Accepted: 03/09/2015] [Indexed: 11/16/2022]
Abstract
In this work, we investigate the compaction activity of a sequential alpha,epsilon-peptide composed of l-lysines towards two RNA targets, in view of its possible pharmaceutical application in RNA-targeting and RNA delivery. The basic oligolysine, object of the present study, proved not only to be efficient in compacting the single-stranded polyA RNA, but also to strongly interact with the polyA·polyU complex, as evidenced by CD-binding and UV-melting experiments. In particular, the marked differences in the CD spectra of the RNA targets upon addition of the peptide, as well as the different UV melting behaviour for the polyA·polyU complex in the presence and absence of the peptide, sustain the hypothesis of a strong RNA compaction capacity of the alpha,epsilon-oligolysine. Finally, by using HPLC analysis, we found a good resistance of the peptide against the lytic action of human serum, an important requirement in view of in vitro/in vivo biological assays.
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Affiliation(s)
- Giovanni N Roviello
- Istituto di Biostrutture e Bioimmagini - CNR, via Mezzocannone 16, 80134 Napoli, Italy.
| | - Domenica Musumeci
- Istituto di Biostrutture e Bioimmagini - CNR, via Mezzocannone 16, 80134 Napoli, Italy; Dipartimento di Scienze Chimiche, Università di Napoli "Federico II", 80126 Napoli, Italy
| | - Valentina Roviello
- Dipartimento di Ingegneria Chimica, dei Materiali e della Produzione Industriale(DICMaPI), Università di Napoli "Federico II", 80125 Napoli, Italy
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21
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Binding ability of a thymine-functionalized oligolysine towards nucleic acids. Bioorg Med Chem 2014; 22:997-1002. [DOI: 10.1016/j.bmc.2013.12.053] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2013] [Revised: 12/08/2013] [Accepted: 12/21/2013] [Indexed: 01/20/2023]
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22
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Roviello GN, Roviello G, Musumeci D, Capasso D, Di Gaetano S, Costanzo M, Pedone C. Synthesis and supramolecular assembly of 1,3-bis(1′-uracilyl)-2-propanone. RSC Adv 2014. [DOI: 10.1039/c4ra03713h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
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23
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Synthesis and thermotropic behavior of cholesteric mixtures containing metallomesogen Cu(II), Ni(II), Pd(II) and vanadyl complexes. INORG CHEM COMMUN 2013. [DOI: 10.1016/j.inoche.2013.10.028] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Roviello G, Borbone F, Carella A, Roviello GN, Tuzi A. Dipentyl 2,6-di-amino-benzo[1,2-b:4,5-b']di-furan-3,7-di-carboxyl-ate. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1526-7. [PMID: 24098215 PMCID: PMC3790396 DOI: 10.1107/s160053681302480x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2013] [Accepted: 09/05/2013] [Indexed: 11/11/2022]
Abstract
The title compound, C22H28N2O6, crystallizes with one half-molecule in the independent unit, the molecule being located on an inversion centre. The penthyl groups are in the all-trans conformation and an almost planar conformation of the whole molecule is observed [maximum deviation from the least-squares plane through all non-H atoms is 0.0229 (17) Å for an N atom]. The amino groups are involved in intra- and intermolecular hydrogen bonds. Intramolecular hydrogen bonding involving the amino group and ester carbonyl helps to lock the syn conformation of the ester with respect to the amino group. In the crystal, N—H⋯O hydrogen bonding involving the amino group and the furan and ester carbonyl O atoms self-assembles the molecules into a two-dimensional hydrogen-bonded network parallel to (010) that displays interdigital packing sustained by alkyl–alkyl interactions.
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Affiliation(s)
- Giuseppina Roviello
- Dipartimento di Ingegneria, Università di Napoli 'Parthenope', Centro Direzionale di Napoli, Isola C4, 80143 Napoli, Italy
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25
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Synthesis and Characterization of Novel Epoxy Geopolymer Hybrid Composites. MATERIALS 2013; 6:3943-3962. [PMID: 28788310 PMCID: PMC5452667 DOI: 10.3390/ma6093943] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2013] [Revised: 08/01/2013] [Accepted: 09/02/2013] [Indexed: 11/16/2022]
Abstract
The preparation and the characterization of novel geopolymer-based hybrid composites are reported. These materials have been prepared through an innovative synthetic approach, based on a co-reticulation in mild conditions of commercial epoxy based organic resins and a metakaolin-based geopolymer inorganic matrix. This synthetic strategy allows the obtainment of a homogeneous dispersion of the organic particles in the inorganic matrix, up to 25% in weight of the resin. The materials obtained present significantly enhanced compressive strengths and toughness with respect to the neat geopolymer, suggesting their wide utilization for structural applications. A preliminary characterization of the porous materials obtained by removing the organic phase from the hybrid composites by means of heat treatments is also reported. Possible applications of these materials in the field of water purification, filtration, or as lightweight insulating materials are envisaged.
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26
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Ricciotti L, Roviello G, Tarallo O, Borbone F, Ferone C, Colangelo F, Catauro M, Cioffi R. Synthesis and characterizations of melamine-based epoxy resins. Int J Mol Sci 2013; 14:18200-14. [PMID: 24013372 PMCID: PMC3794776 DOI: 10.3390/ijms140918200] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2013] [Revised: 08/02/2013] [Accepted: 08/20/2013] [Indexed: 01/12/2023] Open
Abstract
A new, easy and cost-effective synthetic procedure for the preparation of thermosetting melamine-based epoxy resins is reported. By this innovative synthetic method, different kinds of resins can be obtained just by mixing the reagents in the presence of a catalyst without solvent and with mild curing conditions. Two types of resins were synthesized using melamine and a glycidyl derivative (resins I) or by adding a silane derivative (resin II). The resins were characterized by means of chemical-physical and thermal techniques. Experimental results show that all the prepared resins have a good thermal stability, but differ for their mechanical properties: resin I exhibits remarkable stiffness with a storage modulus value up to 830 MPa at room temperature, while lower storage moduli were found for resin II, indicating that the presence of silane groups could enhance the flexibility of these materials. The resins show a pot life higher than 30 min, which makes these resins good candidates for practical applications. The functionalization with silane terminations can be exploited in the formulation of hybrid organic-inorganic composite materials.
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Affiliation(s)
- Laura Ricciotti
- Dipartimento di Ingegneria, Università di Napoli ‘Parthenope’, INSTM Research Group Napoli Parthenope, Centro Direzionale Napoli, Isola C4, Napoli 80143, Italy; E-Mails: (G.R.); (C.F.); (F.C.); (R.C.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +39-081-674446; Fax: +39-081-5476777
| | - Giuseppina Roviello
- Dipartimento di Ingegneria, Università di Napoli ‘Parthenope’, INSTM Research Group Napoli Parthenope, Centro Direzionale Napoli, Isola C4, Napoli 80143, Italy; E-Mails: (G.R.); (C.F.); (F.C.); (R.C.)
| | - Oreste Tarallo
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli “Federico II”, Complesso Universitario di Monte S. Angelo, via Cintia, Napoli 80126, Italy; E-Mails: (O.T.); (F.B.)
| | - Fabio Borbone
- Dipartimento di Scienze Chimiche, Università degli Studi di Napoli “Federico II”, Complesso Universitario di Monte S. Angelo, via Cintia, Napoli 80126, Italy; E-Mails: (O.T.); (F.B.)
| | - Claudio Ferone
- Dipartimento di Ingegneria, Università di Napoli ‘Parthenope’, INSTM Research Group Napoli Parthenope, Centro Direzionale Napoli, Isola C4, Napoli 80143, Italy; E-Mails: (G.R.); (C.F.); (F.C.); (R.C.)
| | - Francesco Colangelo
- Dipartimento di Ingegneria, Università di Napoli ‘Parthenope’, INSTM Research Group Napoli Parthenope, Centro Direzionale Napoli, Isola C4, Napoli 80143, Italy; E-Mails: (G.R.); (C.F.); (F.C.); (R.C.)
| | - Michelina Catauro
- Dipartimento di Ingegneria Industriale e dell’Informazione, Seconda Università di Napoli, via Roma 29, Aversa 81031, Italy; E-Mail:
| | - Raffaele Cioffi
- Dipartimento di Ingegneria, Università di Napoli ‘Parthenope’, INSTM Research Group Napoli Parthenope, Centro Direzionale Napoli, Isola C4, Napoli 80143, Italy; E-Mails: (G.R.); (C.F.); (F.C.); (R.C.)
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27
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Roviello G, Tuzi A, Capacchione C, Milione S, Ferone C. {2-[2,2-Bis(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl-κ N)propyl]pyridine}dichloridoiron(II). Acta Crystallogr Sect E Struct Rep Online 2013; 69:m433-4. [PMID: 24109265 PMCID: PMC3793678 DOI: 10.1107/s1600536813018047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2013] [Accepted: 06/30/2013] [Indexed: 11/29/2022]
Abstract
The title compound,[FeCl2(C18H25N3O2)], has a distorted tetrahedral Cl2N2 coordination of the FeII atom as a result of the constraints imposed by the 2-[2,2-bis(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl)propyl]pyridine ligand. The pyridine ring is almost perpendicular to the six-membered chelated ring containing the metal atom [dihedral angle between their mean planes = 88.5 (1)°].
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28
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Colangelo F, Roviello G, Ricciotti L, Ferone C, Cioffi R. Preparation and Characterization of New Geopolymer-Epoxy Resin Hybrid Mortars. MATERIALS (BASEL, SWITZERLAND) 2013; 6:2989-3006. [PMID: 28811418 PMCID: PMC5521291 DOI: 10.3390/ma6072989] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 06/29/2013] [Accepted: 07/09/2013] [Indexed: 11/24/2022]
Abstract
The preparation and characterization of metakaolin-based geopolymer mortars containing an organic epoxy resin are presented here for the first time. The specimens have been prepared by means of an innovative in situ co-reticulation process, in mild conditions, of commercial epoxy based organic resins and geopolymeric slurry. In this way, geopolymer based hybrid mortars characterized by a different content of normalized sand (up to 66% in weight) and by a homogeneous dispersion of the organic resin have been obtained. Once hardened, these new materials show improved compressive strength and toughness in respect to both the neat geopolymer and the hybrid pastes since the organic polymer provides a more cohesive microstructure, with a reduced amount of microcracks. The microstructural characterization allows to point out the presence of an Interfacial Transition Zone similar to that observed in cement based mortars and concretes. A correlation between microstructural features and mechanical properties has been studied too.
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Affiliation(s)
- Francesco Colangelo
- Department of Engineering, University of Naples 'Parthenope', INSTM Research Group Naples Parthenope, Centro Direzionale Naples, Isola C4, 80143 Naples, Italy.
| | - Giuseppina Roviello
- Department of Engineering, University of Naples 'Parthenope', INSTM Research Group Naples Parthenope, Centro Direzionale Naples, Isola C4, 80143 Naples, Italy.
| | - Laura Ricciotti
- Department of Engineering, University of Naples 'Parthenope', INSTM Research Group Naples Parthenope, Centro Direzionale Naples, Isola C4, 80143 Naples, Italy.
| | - Claudio Ferone
- Department of Engineering, University of Naples 'Parthenope', INSTM Research Group Naples Parthenope, Centro Direzionale Naples, Isola C4, 80143 Naples, Italy.
| | - Raffaele Cioffi
- Department of Engineering, University of Naples 'Parthenope', INSTM Research Group Naples Parthenope, Centro Direzionale Naples, Isola C4, 80143 Naples, Italy.
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29
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Roviello GN, Musumeci D, D'Alessandro C, Pedone C. Synthesis of a thymine-functionalized nucleoamino acid for the solid phase assembly of cationic nucleopeptides. Amino Acids 2013; 45:779-84. [PMID: 23722416 DOI: 10.1007/s00726-013-1520-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Accepted: 05/21/2013] [Indexed: 10/26/2022]
Abstract
In this work, we report the synthesis of a thymine-functionalized nucleoamino acid suitable for the solid phase synthesis of nucleopeptides. The monomer was obtained in solution starting from commercial compounds and after NMR ((1)H and (13)C) and ESIMS (positive ions) characterization it was used for the assembly of a cationic nucleopeptide obtained by sequentially introducing underivatized L-lysine units and nucleoamino acid monomers. After detachment from the resin, performed in acidic conditions, the oligomer was purified by HPLC and characterized by LC-ESIMS (positive ions) which confirmed the identity of the thymine-based nucleopeptide. The cationic nucleobase-containing peptide, well soluble in water, was studied by CD spectroscopy which allowed us to exclude any helical pre-organization of the nucleopeptide in the experimental conditions used. Furthermore, CD behavior of the oligomer at different temperatures was also studied as described in this work.
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Affiliation(s)
- Giovanni N Roviello
- Istituto di Biostrutture e Bioimmagini, CNR, Via Mezzocannone 16, 80134, Naples, Italy,
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