1
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Pahar S, Maayan G. An intramolecular cobalt-peptoid complex as an efficient electrocatalyst for water oxidation at low overpotential. Chem Sci 2024; 15:12928-12938. [PMID: 39148784 PMCID: PMC11323339 DOI: 10.1039/d4sc01182a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2024] [Accepted: 07/05/2024] [Indexed: 08/17/2024] Open
Abstract
Water electrolysis is the simplest way to produce hydrogen, as a clean renewable fuel. However, the high overpotential and slow kinetics hamper its applicability. Designing efficient and stable electrocatalysts for water oxidation (WO), which is the first and limiting step of the water splitting process, can overcome this limitation. However, the development of such catalysts based on non-precious metal ions is still challenging. Herein we describe a bio-inspired Co(iii)-based complex i.e., a stable and efficient molecular electrocatalyst for WO, constructed from a peptidomimetic oligomer called peptoid - N-substituted glycine oligomer - bearing two binding ligands, terpyridine and bipyridine, and one ethanolic group as a proton shuttler. Upon binding of a cobalt ion, this peptoid forms an intramolecular Co(iii) complex, that acts as an efficient electrocatalyst for homogeneous WO in aqueous phosphate buffer at pH 7 with a high faradaic efficiency of up to 92% at an overpotential of about 430 mV, which is the lowest reported for Co-based homogeneous WO electrocatalysts to date. We demonstrated the high stability of the complex during electrocatalytic WO and that the ethanolic side chain plays a key role in the stability and activity of the complex and also in facilitating water binding, thus mimicking an enzymatic second coordination sphere.
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Affiliation(s)
- Suraj Pahar
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
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2
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Pierri G, Schettini R. Advances in MRI: Peptide and peptidomimetic-based contrast agents. J Pept Sci 2024; 30:e3544. [PMID: 37726947 DOI: 10.1002/psc.3544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/25/2023] [Accepted: 08/28/2023] [Indexed: 09/21/2023]
Abstract
Magnetic resonance imaging (MRI) is a common medical imaging technique that provides three-dimensional body images. MRI contrast agents improve image contrast by raising the rate of water proton relaxation in specific tissues. Peptides and peptidomimetics act as scaffolds for MRI imaging agents because of their increased size and offer the possibility to engine a higher hydration value within the design. The design of a new Gd-based contrast agent must take into account high stability constants to avoid free Gd(III), with the subsequent nephrotoxicity, and high relaxivity values. This review analyzes various synthetic approaches, reports studies of relaxometric parameters, and focuses on the description and application of Gd(III)-chelates based on peptide and peptidomimetic scaffolds. In addition, the X-ray molecular structures of three DOTA complexes will be reported to emphasize the necessity of using the X-ray diffraction analysis to identify the coordination sphere of the metals and the mechanism of action of the compounds.
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Affiliation(s)
- Giovanni Pierri
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Salerno, Italy
| | - Rosaria Schettini
- Department of Chemistry and Biology "A. Zambelli", University of Salerno, Salerno, Italy
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3
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Behar AE, Maayan G. A Peptoid-Chelator Selective to Cu 2+ That Can Extract Copper from Metallothionein-2 and Lead to the Production of ROS. Antioxidants (Basel) 2023; 12:2031. [PMID: 38136151 PMCID: PMC10741037 DOI: 10.3390/antiox12122031] [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: 10/13/2023] [Revised: 11/13/2023] [Accepted: 11/16/2023] [Indexed: 12/24/2023] Open
Abstract
Copper is an essential metal ion that is involved in critical cellular processes, but which can also exhibit toxic effects through its ability to catalyze reactive oxygen species (ROS) formation. Dysregulation of copper homeostasis has been implicated in the progression of several diseases, including cancer. A novel therapeutic approach, extensively studied in recent years, is to capitalize on the increased copper uptake and dependency exhibited by cancer cells and to promote copper-associated ROS production within the tumor microenvironment, leading to the apoptosis of cancer cells. Such an effect can be achieved by selectively chelating copper from copper-bearing metalloproteins in cancer cells, thereby forming a copper-chelator complex that produces ROS and, through this, induces oxidative stress and initiates apoptosis. Herein, we describe a peptoid chelator, TB, that is highly suitable to carry this task. Peptoids are N-substituted glycine oligomers that can be efficiently synthesized on a solid support and are also biocompatible; thus, they are considered promising drug candidates. We show, by rigorous spectroscopic techniques, that TB is not only selective for Cu(II) ions, but can also effectively extract copper from metallothionein-2, and the formed complex CuTB can promote ROS production. Our findings present a promising first example for the future development of peptoid-based chelators for applications in anti-cancer chelation therapy, highlighting the potential for the prospect of peptoid chelators as therapeutics.
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Affiliation(s)
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City, Haifa 3200008, Israel
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4
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Behar AE, Maayan G. The First Cu(I)-Peptoid Complex: Enabling Metal Ion Stability and Selectivity via Backbone Helicity. Chemistry 2023; 29:e202301118. [PMID: 37221918 DOI: 10.1002/chem.202301118] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2023] [Revised: 05/17/2023] [Accepted: 05/19/2023] [Indexed: 05/25/2023]
Abstract
Stabilization of Cu(I) is ubiquitous within native copper proteins. Understanding how to stabilize Cu(I) within synthetic biomimetic systems is therefore desired towards biological applications. Peptoids are an important class of peptodomimetics, that can bind metal ions and stabilize them in their high oxidation state. Thus, to date, they were not used for Cu(I) binding. Here we show how the helical peptoid hexamer, having two 2,2'-bipyridine (Bipy) groups that face the same side of the helix, forms the intramolecular air stable Cu(I) complex. Further study of the binding site by rigorous spectroscopic techniques suggests that Cu(I) is tetracoordinated, binding to only three N atoms from the Bipy ligands and to the N-terminus of the peptoid's backbone. A set of control peptoids and experiments indicates that the Cu(I) stability and selectivity are dictated by the intramolecular binding, forced by the helicity of the peptoid, which can be defined as the second coordination sphere of the metal center.
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Affiliation(s)
- Anastasia E Behar
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, 3200008 Haifa, Israel
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5
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Ghosh P, Ruan G, Fridman N, Maayan G. Amide bond hydrolysis of peptoids. Chem Commun (Camb) 2022; 58:9922-9925. [PMID: 35979818 DOI: 10.1039/d2cc02717h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Incorporating a chiral non-coordinating substitution at the N-terminal end within peptoids facilitates regio-selective amide bond hydrolysis mediated by a transition metal ion and/or an acidic buffer as evident by X-ray crystallographic analysis, supported by ESI-MS. This opens up a new direction for peptidomimetic compounds towards future application in chemistry, biology and medicine.
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Affiliation(s)
- Pritam Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
| | - Guilin Ruan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
| | - Natalia Fridman
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
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6
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Dong J, Liu Y, Cui Y. Artificial Metal-Peptide Assemblies: Bioinspired Assembly of Peptides and Metals through Space and across Length Scales. J Am Chem Soc 2021; 143:17316-17336. [PMID: 34618443 DOI: 10.1021/jacs.1c08487] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The exploration of chiral crystalline porous materials, such as metal-organic complexes (MOCs) or metal-organic frameworks (MOFs), has been one of the most exciting recent developments in materials science owing to their widespread applications in enantiospecific processes. However, achieving specific tight-affinity binding and remarkable enantioselectivity toward important biomolecules is still challenging. Perhaps most critically, the lack of adaptability, compatibility, and processability in these materials severely impedes practical applications in chemical engineering and biological technology. In this Perspective, artificial metal-peptide assemblies (MPAs), which are achieved by the assembly of peptides and metals with nanometer-sized cavities or pores, is a new development that could address the current bottlenecks of chiral porous materials. Bioinspired assembly of pore-forming MPAs is not foreign to biological systems and has granted scientists an unprecedented level of control over the chiral recognition sites, conformational flexibility, cavity sizes, and hydrophilic segments through ultrafine-tuning of peptide-derived linkers. We will specifically discuss exemplary MPAs including structurally well-defined metal-peptide complexes and highly crystalline metal-peptide frameworks. With insights from these structures, the peptide assembly and folding by the closer cooperation of metal coordination and noncovalent interactions can create adaptable protein-like nanocavities undergoing a myriad of conformational variations that is reminiscent of enzymatic pockets. We also consider challenges to advancing the field, where the deployment of side-chain groups and manipulation of amino acid sequences are more likely to access the programmable, genetically encodable peptide-mediated porous materials, thus contributing to the enhanced enantioselective recognition as well as enabling key biochemical processes in next-generation versatile biomimetic materials.
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Affiliation(s)
- Jinqiao Dong
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yan Liu
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yong Cui
- School of Chemistry and Chemical Engineering, Frontiers Science Center for Transformative Molecules and State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China
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7
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Herlan CN, Feser D, Schepers U, Bräse S. Bio-instructive materials on-demand - combinatorial chemistry of peptoids, foldamers, and beyond. Chem Commun (Camb) 2021; 57:11131-11152. [PMID: 34611672 DOI: 10.1039/d1cc04237h] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Combinatorial chemistry allows for the rapid synthesis of large compound libraries for high throughput screenings in biology, medicinal chemistry, or materials science. Especially compounds from a highly modular design are interesting for the proper investigation of structure-to-activity relationships. Permutations of building blocks result in many similar but unique compounds. The influence of certain structural features on the entire structure can then be monitored and serve as a starting point for the rational design of potent molecules for various applications. Peptoids, a highly diverse class of bioinspired oligomers, suit perfectly for combinatorial chemistry. Their straightforward synthesis on a solid support using repetitive reaction steps ensures easy handling and high throughput. Applying this modular approach, peptoids are readily accessible, and their interchangeable side-chains allow for various structures. Thus, peptoids can easily be tuned in their solubility, their spatial structure, and, consequently, their applicability in various fields of research. Since their discovery, peptoids have been applied as antimicrobial agents, artificial membranes, molecular transporters, and much more. Studying their three-dimensional structure, various foldamers with fascinating, unique properties were discovered. This non-comprehensive review will state the most interesting discoveries made over the past years and arouse curiosity about what may come.
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Affiliation(s)
- Claudine Nicole Herlan
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.
| | - Dominik Feser
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Ute Schepers
- Institute of Functional Interfaces (IFG), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany.,Institute of Organic Chemistry (IOC), Karlsruhe Institute of Technology (KIT), Fritz Haber Weg 6, 76131 Karlsruhe, Germany
| | - Stefan Bräse
- Institute of Biological and Chemical Systems-Functional Molecular Systems (IBCS-FMS), Karlsruhe Institute of Technology (KIT), Hermann von Helmholtz Platz 1, 76344 Eggenstein-Leopoldshafen, Germany. .,Institute of Organic Chemistry (IOC), Karlsruhe Institute of Technology (KIT), Fritz Haber Weg 6, 76131 Karlsruhe, Germany
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8
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Ruan G, Ghosh P, Fridman N, Maayan G. A Di-Copper-Peptoid in a Noninnocent Borate Buffer as a Fast Electrocatalyst for Homogeneous Water Oxidation with Low Overpotential. J Am Chem Soc 2021; 143:10614-10623. [PMID: 34237937 DOI: 10.1021/jacs.1c03225] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Water electrolysis is a promising approach toward low-cost renewable fuels; however, the high overpotential and slow kinetics limit its applicability. Studies suggest that either dinuclear copper (Cu) centers or the use of borate buffer can lead to efficient catalysis. We previously demonstrated the ability of peptoids-N-substituted glycine oligomers-to stabilize high-oxidation-state metal ions and to form self-assembled di-copper-peptoid complexes. Capitalizing on these features herein we report on a unique Cu-peptoid duplex, Cu2(BEE)2, that is a fast and stable homogeneous electrocatalyst for water oxidation in borate buffer at pH 9.35, with low overpotential and a high turnover frequency of 129 s-1 (peak current measurements) or 5503 s-1 (FOWA); both are the highest reported for Cu-based water electrocatalysts to date. BEE is a peptoid trimer having one 2,2'-bipyridine ligand and two ethanolic groups, easily synthesized on solid support. Cu2(BEE)2 was characterized by single-crystal X-ray diffraction and various spectroscopic and electrochemical techniques, demonstrating its ability to maintain stable in four cycles of controlled potential electrolysis, leading to a high overall turnover number of 51.4 in a total of 2 h. Interestingly, the catalytic activity of control complexes having only one ethanolic side chain is 2 orders of magnitude lower than that of Cu2(BEE)2. On the basis of this comparison and on mechanistic studies, we propose that the ethanolic side chains and the borate buffer have significant roles in the high stability and catalytic activity of Cu2(BEE)2; the -OH groups facilitate protons transfer, while the borate species enables oxygen transfer toward O-O bond formation.
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Affiliation(s)
- Guilin Ruan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Pritam Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel.,The Nancy and Stephen Grand Technion Energy Program, Technion-Israel Institute of Technology, Technion City, Haifa 32000, Israel
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9
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Ghosh P, Rozenberg I, Maayan G. Sequence-function relationship within water-soluble Peptoid Chelators for Cu 2. J Inorg Biochem 2021; 217:111388. [PMID: 33618230 DOI: 10.1016/j.jinorgbio.2021.111388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Revised: 01/31/2021] [Accepted: 02/05/2021] [Indexed: 12/26/2022]
Abstract
Chelation of Cu2+ by synthetic molecules is an emerging therapeutic approach for treating several illnesses in human body such as Wilson disease, cancer and more. Among synthetic metal chelators, those based on peptoids - N-substituted glycine oligomers - are advantageous due to their structural similarity to peptides, ease of synthesis on solid support and versatile controlled sequences. Tuning peptoid sequences, via systematically changing at least one side chain, can facilitate and control their function. Along these lines, this work aims to explore the role of the non-coordinating side chain within peptoid chelators in order to understand the factors that control the selectivity of these chelators to Cu2+ in water medium. To this aim, a set of peptoid trimers having a pyridine group at the acetylated N-terminal, a 2,2'-bipyridine group at the second position and a non-coordinating group at the C-terminus, where the latter is systematically varied between aromatic, aliphatic, chiral or non-chiral, were investigated as selective chelators for Cu2+. The effect of the position of the non-coordinating group on the selectivity of the peptoid to Cu2+ was also tested. Based on extensive spectroscopic data, we found that the choice of the non-coordinating group along with its position dramatically influences the selectivity of the peptoids to Cu2+. We showed that peptoids having bulky chiral groups at the C-terminus enable high selectivity to Cu2+. We further demonstrated the ability of one of the selective chelators to remove Cu2+ from the natural copper binding protein metallothionein in HEPES (4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid) buffer medium.
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Affiliation(s)
- Pritam Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Ido Rozenberg
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel.
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10
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Ruan G, Engelberg L, Ghosh P, Maayan G. A unique Co(iii)-peptoid as a fast electrocatalyst for homogeneous water oxidation with low overpotential. Chem Commun (Camb) 2021; 57:939-942. [DOI: 10.1039/d0cc06912d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A peptoid trimer incorporating terpyridine and ethanol forms an intermolecular cobalt(iii) complex, which performs as a soluble electrocatalyst for water oxidation with a minimal overpotential of 350 mV and a high turnover frequency of 108 s−1.
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Affiliation(s)
- Guilin Ruan
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
| | - Lee Engelberg
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
| | - Pritam Ghosh
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Haifa
- Israel
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11
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Abstract
Sequence-defined oligomeric molecules with discrete folding propensities, termed foldamers, are a versatile source of agents with tailored structure and function. An inspiration for the development of the foldamer paradigm are natural biomacromolecules, the sequence-encoded folding of which is the basis of life. Metal ions and clusters are common features in proteins, where the role of metal varies from supporting structure to enabling function. The ubiquity of metals in natural systems suggests promise for metals in the context of folded artificial backbones. In this Minireview, we highlight efforts to realize this potential through a survey of published work on the design, synthesis, and characterization of metal-binding foldamers.
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Affiliation(s)
- Shilpa R Rao
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Shelby L Schettler
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - W Seth Horne
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA, 15260, USA
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12
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Ghosh P, Maayan G. A Water‐Soluble Peptoid that Can Extract Cu
2+
from Metallothionein via Selective Recognition. Chemistry 2020; 27:1383-1389. [DOI: 10.1002/chem.202003711] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 08/27/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Pritam Ghosh
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
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13
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Ghosh P, Fridman N, Maayan G. From Distinct Metallopeptoids to Self‐Assembled Supramolecular Architectures. Chemistry 2020; 27:634-640. [DOI: 10.1002/chem.202003612] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 08/25/2020] [Indexed: 12/23/2022]
Affiliation(s)
- Pritam Ghosh
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
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14
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Ghosh P, Maayan G. A rationally designed peptoid for the selective chelation of Zn 2+ over Cu 2. Chem Sci 2020; 11:10127-10134. [PMID: 34094275 PMCID: PMC8162371 DOI: 10.1039/d0sc03391j] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The selective removal of Zn2+ from proteins by using a synthetic chelator is a promising therapeutic approach for the treatment of various diseases including cancer. Although the chelation of Zn2+ is well known, its removal from a protein in the presence of potential competing biologically relevant ions such as Cu2+ is hardly explored. Herein we present a peptoid - N-substituted glycine trimer - incorporating a picolyl group at the N-terminus, a non-coordinating but structurally directing benzyl group at the C-terminus and a 2,2':6',2''-terpyridine group in the second position, that selectively binds Zn2+ ions in the presence of excess Cu2+ ions in water. We further demonstrate that this chelator can selectively bind Zn2+ from a pool of excess biologically relevant and competitive ions (Cu2+, Fe3+, Ca2+, Mg2+, Na+, and K+) in a simulated body fluid (SBF), and also its ability to remove Zn2+ from a natural zinc protein domain (PYKCPECGKSFSQKSDLVKHQRTHTG) in a SBF.
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Affiliation(s)
- Pritam Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology Technion City Haifa 3200008 Israel
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15
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Darapaneni CM, Ghosh P, Ghosh T, Maayan G. Unique β‐Turn Peptoid Structures and Their Application as Asymmetric Catalysts. Chemistry 2020; 26:9573-9579. [DOI: 10.1002/chem.202000595] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Indexed: 12/13/2022]
Affiliation(s)
| | - Pritam Ghosh
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| | - Totan Ghosh
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of ChemistryTechnion-Israel Institute of Technology Haifa 3200008 Israel
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16
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A Resin-Bound Peptoid as a Recyclable Heterogeneous Catalyst for Oxidation Reactions. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901739] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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17
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Reese HR, Shanahan CC, Proulx C, Menegatti S. Peptide science: A "rule model" for new generations of peptidomimetics. Acta Biomater 2020; 102:35-74. [PMID: 31698048 DOI: 10.1016/j.actbio.2019.10.045] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 10/17/2019] [Accepted: 10/30/2019] [Indexed: 02/07/2023]
Abstract
Peptides have been heavily investigated for their biocompatible and bioactive properties. Though a wide array of functionalities can be introduced by varying the amino acid sequence or by structural constraints, properties such as proteolytic stability, catalytic activity, and phase behavior in solution are difficult or impossible to impart upon naturally occurring α-L-peptides. To this end, sequence-controlled peptidomimetics exhibit new folds, morphologies, and chemical modifications that create new structures and functions. The study of these new classes of polymers, especially α-peptoids, has been highly influenced by the analysis, computational, and design techniques developed for peptides. This review examines techniques to determine primary, secondary, and tertiary structure of peptides, and how they have been adapted to investigate peptoid structure. Computational models developed for peptides have been modified to predict the morphologies of peptoids and have increased in accuracy in recent years. The combination of in vitro and in silico techniques have led to secondary and tertiary structure design principles that mirror those for peptides. We then examine several important developments in peptoid applications inspired by peptides such as pharmaceuticals, catalysis, and protein-binding. A brief survey of alternative backbone structures and research investigating these peptidomimetics shows how the advancement of peptide and peptoid science has influenced the growth of numerous fields of study. As peptide, peptoid, and other peptidomimetic studies continue to advance, we will expect to see higher throughput structural analyses, greater computational accuracy and functionality, and wider application space that can improve human health, solve environmental challenges, and meet industrial needs. STATEMENT OF SIGNIFICANCE: Many historical, chemical, and functional relations draw a thread connecting peptides to their recent cognates, the "peptidomimetics". This review presents a comprehensive survey of this field by highlighting the width and relevance of these familial connections. In the first section, we examine the experimental and computational techniques originally developed for peptides and their morphing into a broader analytical and predictive toolbox. The second section presents an excursus of the structures and properties of prominent peptidomimetics, and how the expansion of the chemical and structural diversity has returned new exciting properties. The third section presents an overview of technological applications and new families of peptidomimetics. As the field grows, new compounds emerge with clear potential in medicine and advanced manufacturing.
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18
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D'Amato A, Pierri G, Tedesco C, Della Sala G, Izzo I, Costabile C, De Riccardis F. Reverse Turn and Loop Secondary Structures in Stereodefined Cyclic Peptoid Scaffolds. J Org Chem 2019; 84:10911-10928. [PMID: 31339718 DOI: 10.1021/acs.joc.9b01509] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Controlling the network of intramolecular interactions encoded by Nα-chiral side chains and the equilibria between cis- and trans-amide junctions in cyclic peptoid architectures constitutes a significant challenge for the construction of stable reverse turn and loop structures. In this contribution, we reveal, with the support of NMR spectroscopy, single-crystal X-ray crystallography and density functional theory calculations, the relevant noncovalent interactions stabilizing tri-, tetra-, hexa-, and octameric cyclic peptoids (as free hosts and host-guest complexes) with strategically positioned N-(S)-(1-phenylethyl)/N-benzyl side chains, and how these interactions influence the backbone topological order. With the help of theoretical models and spectroscopic/diffractometric studies, we disclose new γ-/β-turn and loop structures present in α-peptoid-based macrocycles and classify them according ϕ, ψ, and ω torsion angles. In our endeavor to characterize emergent secondary structures, we solved the solid-state structure of the largest metallated cyclic peptoid ever reported, characterized by an unprecedented alternated cis/trans amide bond linkage. Overall, our results indicate that molecules endowed with different elements of asymmetry (central and conformational) provide new architectural elements of facile atroposelective construction and broad conformational stability as the minimalist scaffold for novel stereodefined peptidomimetic foldamers and topologically biased libraries necessary for future application of peptoids in all fields of science.
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Affiliation(s)
- Assunta D'Amato
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
| | - Giovanni Pierri
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
| | - Consiglia Tedesco
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
| | - Giorgio Della Sala
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
| | - Irene Izzo
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
| | - Chiara Costabile
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
| | - Francesco De Riccardis
- Department of Chemistry and Biology "A. Zambelli" , University of Salerno , Via Giovanni Paolo II, 132 , Fisciano , Salerno 84084 Italy
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19
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Zborovsky L, Tigger‐Zaborov H, Maayan G. Sequence and Structure of Peptoid Oligomers Can Tune the Photoluminescence of an Embedded Ruthenium Dye. Chemistry 2019; 25:9098-9107. [DOI: 10.1002/chem.201901494] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2019] [Revised: 05/01/2019] [Indexed: 01/31/2023]
Affiliation(s)
| | | | - Galia Maayan
- Technion-Israel Institute of Technology Haifa Israel
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20
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Wellhöfer I, Frydenvang K, Kotesova S, Christiansen AM, Laursen JS, Olsen CA. Functionalized Helical β-Peptoids. J Org Chem 2019; 84:3762-3779. [DOI: 10.1021/acs.joc.9b00218] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Isabelle Wellhöfer
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Karla Frydenvang
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Simona Kotesova
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Andreas M. Christiansen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Jonas S. Laursen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Christian A. Olsen
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
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21
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Baskin M, Zhu H, Qu ZW, Chill JH, Grimme S, Maayan G. Folding of unstructured peptoids and formation of hetero-bimetallic peptoid complexes upon side-chain-to-metal coordination. Chem Sci 2019; 10:620-632. [PMID: 30713653 PMCID: PMC6334629 DOI: 10.1039/c8sc03616k] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 10/16/2018] [Indexed: 01/05/2023] Open
Abstract
Helices are key structural features in biopolymers, enabling a variety of biological functions. Mimicking these secondary structure motifs has wide potential in the development of biomimetic materials. Peptoids, N-substituted glycine oligomers, are an important class of peptide mimics that can adopt polyproline type helices if the majority of their sequence consists of chiral bulky pendent groups. Such side-chains are structure inducers but they have no functional value. We present here the inclusion of several metal-binding groups in one peptoid oligomer as a new platform towards the development of functional helical peptoids. Thus, we describe the coordination of two metal ions to unstructured peptoids incorporating four 8-hydroxyquinoline (HQ) ligands at fixed positions as two (HQ, HQ) metal binding sites, and a mixture of chiral benzyl and alkyl substituents in varied positions along the peptoid backbone. For the first time, we demonstrate by circular dichroism spectroscopy, solution NMR techniques and high-level DFT calculations that some of these unstructured peptoids can fold upon metal binding to form helical structures. Replacing one HQ ligand with a terpyridine (Terpy) ligand resulted in unique sequences that can selectively coordinate Cu2+ to the (Terpy, HQ) and Zn2+ (or Co2+) to the (HQ, HQ) sites from a solution mixture containing Cu2+ and Zn2+ (or Co2+) ions. Interestingly, the binding of Cu2+ to the (Terpy, HQ) site in one of these peptoids can initiate a conformational change that in turn facilitates the coordination of Zn2+ (or Co2+) ions to the (HQ, HQ) site, demonstrating a unique example of positive allosteric cooperativity in peptide mimics.
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Affiliation(s)
- Maria Baskin
- Schulich Faculty of Chemistry , Technion - Israel Institute of Technology , Technion City , Hailfa 32000 , Israel .
| | - Hui Zhu
- Mulliken Center for Theoretical Chemistry , Rheinische Friedrich-Wilhelms-Universität Bonn , Beringstrasse 4 , 53115 Bonn , Germany
| | - Zheng-Wang Qu
- Mulliken Center for Theoretical Chemistry , Rheinische Friedrich-Wilhelms-Universität Bonn , Beringstrasse 4 , 53115 Bonn , Germany
| | - Jordan H Chill
- Department of Chemistry , Bar-Ilan University , Ramat Gan 52900 , Israel
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry , Rheinische Friedrich-Wilhelms-Universität Bonn , Beringstrasse 4 , 53115 Bonn , Germany
| | - Galia Maayan
- Schulich Faculty of Chemistry , Technion - Israel Institute of Technology , Technion City , Hailfa 32000 , Israel .
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22
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Tigger-Zaborov H, Maayan G. Aggregation of Ag(0) nanoparticles to unexpected stable chain-like assemblies mediated by 2,2′-bipyridine decorated peptoids. J Colloid Interface Sci 2019; 533:598-603. [DOI: 10.1016/j.jcis.2018.08.094] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 08/26/2018] [Accepted: 08/27/2018] [Indexed: 10/28/2022]
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23
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Nguyen AI, Spencer RK, Anderson CL, Zuckermann RN. A bio-inspired approach to ligand design: folding single-chain peptoids to chelate a multimetallic cluster. Chem Sci 2018; 9:8806-8813. [PMID: 30746115 PMCID: PMC6335634 DOI: 10.1039/c8sc04240c] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Accepted: 11/05/2018] [Indexed: 12/12/2022] Open
Abstract
Synthesis of biomimetic multimetallic clusters is sought after for applications such as efficient storage of solar energy and utilization of greenhouse gases. However, synthetic efforts are hampered by a dearth of ligands that are developed for multimetallic clusters due to current limitations in rational design and organic synthesis. Peptoids, a synthetic sequence-defined oligomer, enable a biomimetic strategy to rapidly synthesize and optimize large, multifunctional ligands by structural design and combinatorial screening. Here we discover peptoid oligomers (≤7 residues) that fold into a single conformation to provide unprecedented tetra- and hexadentate chelation by carboxylates to a [Co4O4] cubane cluster. The structures of peptoid-bound cubanes were determined by 2D NMR spectroscopy, and their structures reveal key steric and side-chain-to-main chain interactions that work in concert to rigidify the peptoid ligand. This efficient ligand design strategy holds promise for creating new scaffolds for the abiotic synthesis and manipulation of multimetallic clusters.
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Affiliation(s)
- Andy I Nguyen
- Molecular Foundry , Lawrence Berkeley National Laboratory , Berkeley , CA 94720 , USA .
| | - Ryan K Spencer
- Department of Chemistry , Department of Chemical Engineering & Materials Science , University of California , Irvine , CA 92697 , USA
| | | | - Ronald N Zuckermann
- Molecular Foundry , Lawrence Berkeley National Laboratory , Berkeley , CA 94720 , USA .
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24
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Brahm K, Wack JS, Eckes S, Engemann V, Schmitz K. Macrocyclization enhances affinity of chemokine‐binding peptoids. Biopolymers 2018; 110:e23244. [DOI: 10.1002/bip.23244] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2018] [Revised: 10/25/2018] [Accepted: 11/07/2018] [Indexed: 01/27/2023]
Affiliation(s)
- Kevin Brahm
- Clemens‐Schöpf‐Institute of Organic Chemistry and BiochemistryTU Darmstadt Darmstadt Germany
| | - Julia S. Wack
- Clemens‐Schöpf‐Institute of Organic Chemistry and BiochemistryTU Darmstadt Darmstadt Germany
| | - Stefanie Eckes
- Clemens‐Schöpf‐Institute of Organic Chemistry and BiochemistryTU Darmstadt Darmstadt Germany
| | - Victoria Engemann
- Clemens‐Schöpf‐Institute of Organic Chemistry and BiochemistryTU Darmstadt Darmstadt Germany
| | - Katja Schmitz
- Clemens‐Schöpf‐Institute of Organic Chemistry and BiochemistryTU Darmstadt Darmstadt Germany
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25
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Ghosh T, Ghosh P, Maayan G. A Copper-Peptoid as a Highly Stable, Efficient, and Reusable Homogeneous Water Oxidation Electrocatalyst. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03661] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Totan Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Pritam Ghosh
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Technion City, Haifa 3200008, Israel
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26
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Ghosh T, Fridman N, Kosa M, Maayan G. Self-Assembled Cyclic Structures from Copper(II) Peptoids. Angew Chem Int Ed Engl 2018; 57:7703-7708. [DOI: 10.1002/anie.201800583] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 03/01/2018] [Indexed: 01/11/2023]
Affiliation(s)
- Totan Ghosh
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
| | - Monica Kosa
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
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27
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Ghosh T, Fridman N, Kosa M, Maayan G. Self-Assembled Cyclic Structures from Copper(II) Peptoids. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800583] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Totan Ghosh
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
| | - Natalia Fridman
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
| | - Monica Kosa
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Technion City Haifa 3200008 Israel
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28
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Solid-Phase Synthesis of Azole-Comprising Peptidomimetics and Coordination of a Designed Analog to Zn 2. Molecules 2018; 23:molecules23051035. [PMID: 29710766 PMCID: PMC6102547 DOI: 10.3390/molecules23051035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Revised: 04/23/2018] [Accepted: 04/26/2018] [Indexed: 12/14/2022] Open
Abstract
Peptidomimetics that can coordinate transition metals have a variety of potential applications as catalysts, sensors, or materials. A new modular peptidomimetic scaffold, the “azole peptoid”, is introduced here. We report methods for the solid-phase synthesis of eleven examples of trimeric N-substituted oligoamides that include oxazole- or thiazole-functionalized backbones. The products prepared comprise a diversity of functionality, including a metal-coordinating terpyridine group. The modular synthetic approach enables ready preparation of analogs for specific applications. To highlight a potential use of this new synthetic scaffold, a trimeric azole peptoid functionalized with a terpyridine residue was prepared and studied. The characteristic 2:1 ligand:metal binding of this terpyridine-functionalized azole peptoid to Zn2+ in aqueous solution was observed. These studies introduce azole peptoids as a useful class of biomimetic molecules for further study and application.
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29
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Baskin M, Maayan G. Chiral Cu(ii), Co(ii) and Ni(ii) complexes based on 2,2′-bipyridine modified peptoids. Dalton Trans 2018; 47:10767-10774. [DOI: 10.1039/c8dt01308j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Helical peptoids bearing 2,2′-bipyridine, varied in their chiral bulky side chains and their N-terminus form chiral complexes with Cu(ii), Co(ii) and Ni(ii) via intramolecular binding.
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Affiliation(s)
- Maria Baskin
- Schulich Faculty of Chemistry
- Technion-Israel Institute of Technology
- Haifa
- Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry
- Technion-Israel Institute of Technology
- Haifa
- Israel
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30
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Darapaneni CM, Kaniraj PJ, Maayan G. Water soluble hydrophobic peptoids via a minor backbone modification. Org Biomol Chem 2018; 16:1480-1488. [DOI: 10.1039/c7ob02928d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The incorporation of piperazine or homopiperazine within hydrophobic peptoid scaffolds leads to their water solubility while increasing their overall conformational order in water.
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Affiliation(s)
| | - Prathap Jeya Kaniraj
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Technion City
- Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry
- Technion – Israel Institute of Technology
- Technion City
- Israel
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31
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Zborovsky L, Smolyakova A, Baskin M, Maayan G. A Pure Polyproline Type I-like Peptoid Helix by Metal Coordination. Chemistry 2017; 24:1159-1167. [DOI: 10.1002/chem.201704497] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Lieby Zborovsky
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Haifa 32000 Israel
| | - Alisa Smolyakova
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Haifa 32000 Israel
| | - Maria Baskin
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Haifa 32000 Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry; Technion-Israel Institute of Technology; Haifa 32000 Israel
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32
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Chandra Mohan D, Sadhukha A, Maayan G. A metallopeptoid as an efficient bioinspired cooperative catalyst for the aerobic oxidative synthesis of imines. J Catal 2017. [DOI: 10.1016/j.jcat.2017.09.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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D'Amato A, Volpe R, Vaccaro MC, Terracciano S, Bruno I, Tosolini M, Tedesco C, Pierri G, Tecilla P, Costabile C, Della Sala G, Izzo I, De Riccardis F. Cyclic Peptoids as Mycotoxin Mimics: An Exploration of Their Structural and Biological Properties. J Org Chem 2017; 82:8848-8863. [PMID: 28763612 DOI: 10.1021/acs.joc.7b00965] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cyclic peptoids have recently emerged as important examples of peptidomimetics for their interesting complexing properties and innate ability to permeate biological barriers. In the present contribution, experimental and theoretical data evidence the intricate conformational and stereochemical properties of five novel hexameric peptoids decorated with N-isopropyl, N-isobutyl, and N-benzyl substituents. Complexation studies by NMR, in the presence of sodium tetrakis[3,5-bis(trifluoromethyl)phenyl]borate (NaTFPB), theoretical calculations, and single-crystal X-ray analyses indicate that the conformationally stable host/guest metal adducts display architectural ordering comparable to that of the enniatins and beauvericin mycotoxins. Similarly to the natural depsipeptides, the synthetic oligolactam analogues show a correlation between ion transport abilities in artificial liposomes and cytotoxic activity on human cancer cell lines. The reported results demonstrate that the versatile cyclic peptoid scaffold, for its remarkable conformational and complexing properties, can morphologically mimic related natural products and elicit powerful biological activities.
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Affiliation(s)
| | | | | | | | | | - Massimo Tosolini
- Department of Chemical and Pharmaceutical Sciences, University of Trieste , Via Giorgieri, 1, Trieste 34127, Italy
| | | | | | - Paolo Tecilla
- Department of Chemical and Pharmaceutical Sciences, University of Trieste , Via Giorgieri, 1, Trieste 34127, Italy
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34
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Tigger-Zaborov H, Maayan G. Nanoparticles assemblies on demand: Controlled aggregation of Ag(0) mediated by modified peptoid sequences. J Colloid Interface Sci 2017; 508:56-64. [PMID: 28822292 DOI: 10.1016/j.jcis.2017.08.039] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Revised: 08/09/2017] [Accepted: 08/11/2017] [Indexed: 01/09/2023]
Abstract
Assemblies of metal nanoparticles (NPs) have been broadly used for the construction of materials with distinct spectroscopic properties towards sensing applications. On the other hand, well-dispersed NPs are exploit for applications in catalysis and medicine. Biopolymers or biomimetic oligomers can serve both as efficient stabilizers of NPs and as useful aggregation mediators that can lead to assemblies with unique properties. Controlling aggregation processes, however, is still challenging and often relies on trial and error rather than on defined thumb rules. Herein we develop specific guidelines for the controlled aggregation of Ag(0) NPs at room temperature in water near neutral pH and without any additives. We use short peptide mimics, N-substituted glycine oligomers called peptoids, as mediators, and investigate the influence of sequences variations on the NPs assembly. Spectroscopic and electron microscopy data reveal that both the length of the peptoids and their sequences have an effect on the NPs aggregation. Thus, we demonstrate that we can control both the degree of aggregation and the aggregates sizes by tuning these properties. Specifically we show that longer peptoid sequences as well as sequences consisting of aromatic side chains are required for the formation of uniform NPs assemblies in an average size of 70nm, while a short hydrophilic sequence can stabilize well-dispersed Ag(0) NPs. Moreover, the catalytic activity of Ag(0) NPs towards the reduction of 4-nitrophenol to 4-aminophenol can be also controlled by varying the properties of the peptoid mediators.
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Affiliation(s)
- Hagar Tigger-Zaborov
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, Israel
| | - Galia Maayan
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Haifa, Israel.
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35
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Tashiro S, Chiba M, Shionoya M. Arrangement of Proteinogenic α-Amino Acids on a Cyclic Peptide Comprising Alternate Biphenyl-Cored ζ-Amino Acids. Chem Asian J 2017; 12:1087-1094. [DOI: 10.1002/asia.201700203] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Revised: 03/25/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Shohei Tashiro
- Department of Chemistry; Graduate School of Science; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Masayuki Chiba
- Department of Chemistry; Graduate School of Science; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
| | - Mitsuhiko Shionoya
- Department of Chemistry; Graduate School of Science; The University of Tokyo; 7-3-1 Hongo, Bunkyo-ku Tokyo 113-0033 Japan
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36
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D'Amato A, Schettini R, Della Sala G, Costabile C, Tedesco C, Izzo I, De Riccardis F. Conformational isomerism in cyclic peptoids and its specification. Org Biomol Chem 2017; 15:9932-9942. [DOI: 10.1039/c7ob02643a] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Conformational chirality is an emerging and neglected property of rigid cyclic peptoids determining structural, catalytic, and biological properties. The present contribution analyzes its impact and sets the configurational rules to define it.
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Affiliation(s)
- A. D'Amato
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
| | - R. Schettini
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
| | - G. Della Sala
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
| | - C. Costabile
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
| | - C. Tedesco
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
| | - I. Izzo
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
| | - F. De Riccardis
- Department of Chemistry and Biology “A. Zambelli”
- University of Salerno
- Fisciano
- Italy
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37
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De Santis E, Edwards AA, Alexander BD, Holder SJ, Biesse-Martin AS, Nielsen BV, Mistry D, Waters L, Siligardi G, Hussain R, Faure S, Taillefumier C. Selective complexation of divalent cations by a cyclic α,β-peptoid hexamer: a spectroscopic and computational study. Org Biomol Chem 2016; 14:11371-11380. [DOI: 10.1039/c6ob01954d] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The first report on metal binding ability of a cyclic α,β-peptoid hexamer towards a selection of metal cations is presented.
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Affiliation(s)
- E. De Santis
- Medway School of Pharmacy
- Universities of Kent and Greenwich at Medway
- Chatham Maritime
- UK
| | - A. A. Edwards
- Medway School of Pharmacy
- Universities of Kent and Greenwich at Medway
- Chatham Maritime
- UK
| | | | - S. J. Holder
- Functional Materials Group
- School of Physical Sciences
- University of Kent
- Canterbury
- UK
| | - A.-S. Biesse-Martin
- Université Clermont Auvergne
- Université Blaise Pascal
- Institut de Chimie de Clermont-Ferrand
- F-63000 Clermont-Ferrand
- France
| | - B. V. Nielsen
- School of Science
- University of Greenwich
- Chatham Maritime
- UK
| | - D. Mistry
- Division of Pharmacy and Pharmaceutical Sciences
- University of Huddersfield
- Huddersfield
- UK
| | - L. Waters
- Division of Pharmacy and Pharmaceutical Sciences
- University of Huddersfield
- Huddersfield
- UK
| | | | | | - S. Faure
- Université Clermont Auvergne
- Université Blaise Pascal
- Institut de Chimie de Clermont-Ferrand
- F-63000 Clermont-Ferrand
- France
| | - C. Taillefumier
- Université Clermont Auvergne
- Université Blaise Pascal
- Institut de Chimie de Clermont-Ferrand
- F-63000 Clermont-Ferrand
- France
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