1
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Yang K, Kotak HA, Haynes CJ. Metal-organic ion transport systems. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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2
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Sasaki R, Sato K, Tabata KV, Noji H, Kinbara K. Synthetic Ion Channel Formed by Multiblock Amphiphile with Anisotropic Dual-Stimuli-Responsiveness. J Am Chem Soc 2021; 143:1348-1355. [DOI: 10.1021/jacs.0c09470] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Ryo Sasaki
- School of Life Science and Technology, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan
| | - Kohei Sato
- School of Life Science and Technology, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan
| | - Kazuhito V. Tabata
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Hiroyuki Noji
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazushi Kinbara
- School of Life Science and Technology, Tokyo Institute of Technology, 4259, Nagatsuta-cho, Midori-ku, Yokohama 226-8501, Japan
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3
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Hu X, Yang H. A reversible single-molecule ligand-gating ion transportation switch of ON–OFF–ON type through a photoresponsive pillar[6]arene channel complex. RSC Adv 2021; 11:7450-7453. [PMID: 35423228 PMCID: PMC8695115 DOI: 10.1039/d0ra10871e] [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: 12/27/2020] [Accepted: 02/08/2021] [Indexed: 12/04/2022] Open
Abstract
A reversible pseudo-single-ligand-gated ion transportation switch of ON–OFF–ON type was achieved through host–guest complexation with pillar[6]arene (P[6]) as the ion channel, and a photoresponsive azobenzene as the dual-role (open and close) ligand. A reversible pseudo-single-ligand-gated ion transportation switch of ON–OFF–ON type through pillar[6]arene and photoresponsive azobenzene as dual-role ligand.![]()
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Affiliation(s)
- Xinyu Hu
- Key Laboratory of Micro-Nano Optoelectronic Devices (Wenzhou)
- College of Electrical and Electronic Engineering
- Wenzhou University
- Wenzhou 325035
- People's Republic of China
| | - Haishen Yang
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power
- Shanghai University of Electric Power
- Shanghai
- People's Republic of China
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4
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Zheng S, Huang L, Sun Z, Barboiu M. Self‐Assembled Artificial Ion‐Channels toward Natural Selection of Functions. Angew Chem Int Ed Engl 2020; 60:566-597. [DOI: 10.1002/anie.201915287] [Citation(s) in RCA: 63] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2019] [Indexed: 12/31/2022]
Affiliation(s)
- Shao‐Ping Zheng
- Lehn Institute of Functional Materials School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier France
| | - Li‐Bo Huang
- Lehn Institute of Functional Materials School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier France
| | - Zhanhu Sun
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier France
| | - Mihail Barboiu
- Lehn Institute of Functional Materials School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier France
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5
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Zheng S, Huang L, Sun Z, Barboiu M. Selbstorganisierte künstliche Ionenkanäle für die natürliche Selektion von Funktionen. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201915287] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shao‐Ping Zheng
- Lehn Institute of Functional Materials School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier Frankreich
| | - Li‐Bo Huang
- Lehn Institute of Functional Materials School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier Frankreich
| | - Zhanhu Sun
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier Frankreich
| | - Mihail Barboiu
- Lehn Institute of Functional Materials School of Chemistry Sun Yat-Sen University Guangzhou 510275 China
- Institut Europeen des Membranes Adaptive Supramolecular Nanosystems Group University of Montpellier ENSCM-CNRS Place E. Bataillon CC047 34095 Montpellier Frankreich
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6
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Abstract
Communication between and inside cells as well as their response to external stimuli relies on elaborated systems of signal transduction. They all require a directional transmission across membranes, often realized by primary messenger docking onto external receptor units and subsequent internalization of the signal in form of a released second messenger. This in turn starts a cascade of events which ultimately control all functions of the living cell. Although signal transduction is a fundamental biological process realized by supramolecular recognition and multiplication events with small molecules, chemists have just begun to invent artificial models which allow to study the underlying rules, and one day perhaps to rescue damaged transduction systems in nature. This review summarizes the exciting pioneering efforts of chemists to create simple models for the basic principles of signal transduction across a membrane. It starts with first attempts to establish molecular recognition events on liposomes with embedded receptor amphiphiles and moves on to simple transmembrane signaling across lipid bilayers. More elaborated systems step by step incorporate more elements of cell signaling, such as primary and secondary messenger or a useful cellular response such as cargo release.
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Affiliation(s)
- Robert Bekus
- University of Duisburg-Essen Faculty of Chemistry Universitätsstr. 7 45117 Essen Germany
| | - Thomas Schrader
- University of Duisburg-Essen Faculty of Chemistry Universitätsstr. 7 45117 Essen Germany
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7
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Peters AD, Borsley S, Della Sala F, Cairns-Gibson DF, Leonidou M, Clayden J, Whitehead GFS, Vitórica-Yrezábal IJ, Takano E, Burthem J, Cockroft SL, Webb SJ. Switchable foldamer ion channels with antibacterial activity. Chem Sci 2020; 11:7023-7030. [PMID: 32953034 PMCID: PMC7481839 DOI: 10.1039/d0sc02393k] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 06/04/2020] [Indexed: 12/19/2022] Open
Abstract
Synthetic ion channels may have applications in treating channelopathies and as new classes of antibiotics, particularly if ion flow through the channels can be controlled. Here we describe triazole-capped octameric α-aminoisobutyric acid (Aib) foldamers that "switch on" ion channel activity in phospholipid bilayers upon copper(ii) chloride addition; activity is "switched off" upon copper(ii) extraction. X-ray crystallography showed that CuCl2 complexation gave chloro-bridged foldamer dimers, with hydrogen bonds between dimers producing channels within the crystal structure. These interactions suggest a pathway for foldamer self-assembly into membrane ion channels. The copper(ii)-foldamer complexes showed antibacterial activity against B. megaterium strain DSM319 that was similar to the peptaibol antibiotic alamethicin, but with 90% lower hemolytic activity.
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Affiliation(s)
- Anna D Peters
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK . .,Manchester Institute of Biotechnology , University of Manchester , 131 Princess St , Manchester M1 7DN , UK
| | - Stefan Borsley
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK . .,EaStCHEM School of Chemistry , University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh EH9 3FJ , UK
| | - Flavio Della Sala
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK . .,Manchester Institute of Biotechnology , University of Manchester , 131 Princess St , Manchester M1 7DN , UK
| | - Dominic F Cairns-Gibson
- EaStCHEM School of Chemistry , University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh EH9 3FJ , UK
| | - Marios Leonidou
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK . .,Manchester Institute of Biotechnology , University of Manchester , 131 Princess St , Manchester M1 7DN , UK
| | - Jonathan Clayden
- School of Chemistry , University of Bristol , Cantock's Close , Bristol BS8 1TS , UK
| | - George F S Whitehead
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK .
| | | | - Eriko Takano
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK . .,Manchester Institute of Biotechnology , University of Manchester , 131 Princess St , Manchester M1 7DN , UK
| | - John Burthem
- Department of Haematology , Manchester Royal Infirmary , Manchester University NHS Foundation Trust , Manchester M13 9WL , UK.,Division of Cancer Sciences , School of Medical Sciences , University of Manchester , Manchester , UK
| | - Scott L Cockroft
- EaStCHEM School of Chemistry , University of Edinburgh , Joseph Black Building, David Brewster Road , Edinburgh EH9 3FJ , UK
| | - Simon J Webb
- Department of Chemistry , University of Manchester , Oxford Road , Manchester M13 9PL , UK . .,Manchester Institute of Biotechnology , University of Manchester , 131 Princess St , Manchester M1 7DN , UK
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8
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Abstract
The combination of supramolecular functional systems with biomolecular chemistry has been a fruitful exercise for decades, leading to a greater understanding of biomolecules and to a great variety of applications, for example, in drug delivery and sensing. Within these developments, the phospholipid bilayer membrane, surrounding live cells, with all its functions has also intrigued supramolecular chemists. Herein, recent efforts from the supramolecular chemistry community to mimic natural functions of lipid membranes, such as sensing, molecular recognition, membrane fusion, signal transduction, and gated transport, are reviewed.
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Affiliation(s)
- Andrea Barba-Bon
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany
| | - Mohamed Nilam
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany
| | - Andreas Hennig
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, 28759, Bremen, Germany
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9
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Muraoka T. Biofunctional Molecules Inspired by Protein Mimicry and Manipulation. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2020. [DOI: 10.1246/bcsj.20190315] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Takahiro Muraoka
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
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10
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Hu X, Liu N, Yang H, Wu F, Chen X, Li C, Chen X. A reversible ion transportation switch of ON–OFF–ON type by a ligand-gated calix[6]arene channel. Chem Commun (Camb) 2019; 55:3008-3011. [DOI: 10.1039/c9cc00732f] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Calix[6]arene (CX6) was found to be an efficient ion transmembrane channel, which could be blocked by methylene blue (MB) through host–guest interactions.
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Affiliation(s)
- Xinyu Hu
- College of Mathematic and Electronic Information Engineering
- Wenzhou University
- Wenzhou 325035
- P. R. China
| | - Nannan Liu
- College of Chemistry and Materials Engineering
- Wenzhou University
- Wenzhou 325035
- P. R. China
| | - Haishen Yang
- Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power
- Shanghai University of Electric Power
- Shanghai
- China
| | - Fen Wu
- College of Chemistry and Materials Engineering
- Wenzhou University
- Wenzhou 325035
- P. R. China
| | - Xi Chen
- College of Mathematic and Electronic Information Engineering
- Wenzhou University
- Wenzhou 325035
- P. R. China
| | - Canpeng Li
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
- P. R. China
| | - Xiaojing Chen
- College of Mathematic and Electronic Information Engineering
- Wenzhou University
- Wenzhou 325035
- P. R. China
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11
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Adam C, Peters AD, Lizio MG, Whitehead GFS, Diemer V, Cooper JA, Cockroft SL, Clayden J, Webb SJ. The Role of Terminal Functionality in the Membrane and Antibacterial Activity of Peptaibol-Mimetic Aib Foldamers. Chemistry 2018; 24:2249-2256. [PMID: 29210477 DOI: 10.1002/chem.201705299] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Indexed: 01/04/2023]
Abstract
Peptaibols are peptide antibiotics that typically feature an N-terminal acetyl cap, a C-terminal aminoalcohol, and a high proportion of α-aminoisobutyric acid (Aib) residues. To establish how each feature might affect the membrane-activity of peptaibols, biomimetic Aib foldamers with different lengths and terminal groups were synthesised. Vesicle assays showed that long foldamers (eleven Aib residues) with hydrophobic termini had the highest ionophoric activity. C-terminal acids or primary amides inhibited activity, while replacement of an N-terminal acetyl with an azide group made little difference. Crystallography showed that N3 Aib11 CH2 OTIPS folded into a 310 helix 2.91 nm long, which is close to the bilayer hydrophobic width. Planar bilayer conductance assays showed discrete ion channels only for N-acetylated foldamers. However long foldamers with hydrophobic termini had the highest antibacterial activity, indicating that ionophoric activity in vesicles was a better indicator of antibacterial activity than the observation of discrete ion channels.
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Affiliation(s)
- Catherine Adam
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Anna D Peters
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Manchester Institute of Biotechnology, University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
| | - M Giovanna Lizio
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Manchester Institute of Biotechnology, University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
| | - George F S Whitehead
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Vincent Diemer
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Manchester Institute of Biotechnology, University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
| | - James A Cooper
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Scott L Cockroft
- EaStCHEM School of Chemistry, University of Edinburgh, Joseph Black Building, David Brewster Road, Edinburgh, EH9 3FJ, UK
| | - Jonathan Clayden
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Simon J Webb
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.,Manchester Institute of Biotechnology, University of Manchester, 131 Princess St, Manchester, M1 7DN, UK
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12
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Haynes CJE, Zhu J, Chimerel C, Hernández-Ainsa S, Riddell IA, Ronson TK, Keyser UF, Nitschke JR. Blockable Zn10
L15
Ion Channels through Subcomponent Self-Assembly. Angew Chem Int Ed Engl 2017; 56:15388-15392. [DOI: 10.1002/anie.201709544] [Citation(s) in RCA: 53] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Cally J. E. Haynes
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Jinbo Zhu
- Cavendish Laboratory; University of Cambridge; JJ Thompson Avenue Cambridge CB3 0HE UK
| | - Catalin Chimerel
- Cavendish Laboratory; University of Cambridge; JJ Thompson Avenue Cambridge CB3 0HE UK
| | | | - Imogen A. Riddell
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
- Current address: School of Chemistry; University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Tanya K. Ronson
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Ulrich F. Keyser
- Cavendish Laboratory; University of Cambridge; JJ Thompson Avenue Cambridge CB3 0HE UK
| | - Jonathan R. Nitschke
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
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13
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Haynes CJE, Zhu J, Chimerel C, Hernández-Ainsa S, Riddell IA, Ronson TK, Keyser UF, Nitschke JR. Blockable Zn10
L15
Ion Channels through Subcomponent Self-Assembly. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709544] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Cally J. E. Haynes
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Jinbo Zhu
- Cavendish Laboratory; University of Cambridge; JJ Thompson Avenue Cambridge CB3 0HE UK
| | - Catalin Chimerel
- Cavendish Laboratory; University of Cambridge; JJ Thompson Avenue Cambridge CB3 0HE UK
| | | | - Imogen A. Riddell
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
- Current address: School of Chemistry; University of Manchester; Oxford Road Manchester M13 9PL UK
| | - Tanya K. Ronson
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
| | - Ulrich F. Keyser
- Cavendish Laboratory; University of Cambridge; JJ Thompson Avenue Cambridge CB3 0HE UK
| | - Jonathan R. Nitschke
- Department of Chemistry; University of Cambridge; Lensfield Road Cambridge CB2 1EW UK
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14
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Li R, Muraoka T, Kinbara K. Thermally-induced lateral assembly of a PEG-containing amphiphile triggering vesicle budding. Chem Commun (Camb) 2017; 53:11662-11665. [PMID: 29018844 DOI: 10.1039/c7cc06489f] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A macrocyclic amphiphile consisting of a thermo-responsive octaethylene glycol chain with hydrophobic aromatic and aliphatic units undergoes lateral self-assembly in a liquid-disordered-state phospholipid bilayer membrane upon heating, which further leads to vesicle budding.
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Affiliation(s)
- Rui Li
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
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15
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Li W, McManus D, Liu H, Casiraghi C, Webb SJ. Aqueous dispersions of nanostructures formed through the self-assembly of iminolipids with exchangeable hydrophobic termini. Phys Chem Chem Phys 2017. [PMID: 28642943 DOI: 10.1039/c7cp02868g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The addition of amines to an aldehyde surfactant, which was designed to be analogous to didodecyldimethylammonium bromide, gave exchangeable "iminolipids" that self-assembled to give stable aqueous dispersions of nano-sized vesicles. For example, sonication of suspensions of the n-hexylamine-derived iminolipid gave vesicles 50 to 200 nm in diameter that could encapsulate a water-soluble dye. The iminolipids could undergo dynamic exchange with added amines, and the resulting equilibrium constants (Krel) were quantified by 1H NMR spectroscopy. In the absence of lipid self-assembly, in CDCl3, the assayed primary amines gave very similar Krel values. However in D2O the value of Krel generally increased with increasing amine hydrophobicity, consistent with partitioning into a self-assembled bilayer. Amines with aromatic groups showed significantly higher values of Krel in D2O compared to similarly hydrophobic alkylamines, suggesting that π-π interactions favor lipid self-assembly. Given this synergistic relationship, π-rich pyrenyliminolipids were created and used to exfoliate graphite, leading to aqueous dispersions of graphene flakes that were stable over several months.
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Affiliation(s)
- Wen Li
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, UK
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16
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Benke BP, Aich P, Kim Y, Kim KL, Rohman MR, Hong S, Hwang IC, Lee EH, Roh JH, Kim K. Iodide-Selective Synthetic Ion Channels Based on Shape-Persistent Organic Cages. J Am Chem Soc 2017; 139:7432-7435. [DOI: 10.1021/jacs.7b02708] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bahiru Punja Benke
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Pulakesh Aich
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Younghoon Kim
- Department
of Chemistry, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Kyung Lock Kim
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Md Rumum Rohman
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Soonsang Hong
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
- Department
of Chemistry, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - In-Chul Hwang
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Eun Hui Lee
- Department
of Physiology, College of Medicine, The Catholic University of Korea, Seoul 06591, Republic of Korea
| | - Joon Ho Roh
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
| | - Kimoon Kim
- Center
for Self-assembly and Complexity (CSC), Institute for Basic Science (IBS), Pohang 37673, Republic of Korea
- Department
of Chemistry, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
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17
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Kempf J, Schmitzer AR. Metal-Organic Synthetic Transporters (MOST): Efficient Chloride and Antibiotic Transmembrane Transporters. Chemistry 2017; 23:6441-6451. [DOI: 10.1002/chem.201700847] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Julie Kempf
- Département de Chimie; Université de Montréal; C. P. 6128 Succursale Centre-Ville Montréal Québec H3C 3J7 Canada
| | - Andreea R. Schmitzer
- Département de Chimie; Université de Montréal; C. P. 6128 Succursale Centre-Ville Montréal Québec H3C 3J7 Canada
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18
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Xin P, Tan S, Wang Y, Sun Y, Wang Y, Xu Y, Chen CP. Functionalized hydrazide macrocycle ion channels showing pH-sensitive ion selectivities. Chem Commun (Camb) 2017; 53:625-628. [DOI: 10.1039/c6cc08943g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The protonation and deprotonation of multiple amines and carboxyls in channels change the charge distribution, which leads to pH-sensitive ion selectivity.
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Affiliation(s)
- Pengyang Xin
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
| | - Si Tan
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
| | - Yaodong Wang
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
| | - Yonghui Sun
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
| | - Yan Wang
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
| | - Yuqing Xu
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
| | - Chang-Po Chen
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- China
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19
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Pike SJ, Jones JE, Raftery J, Clayden J, Webb SJ. Helical peptaibol mimics are better ionophores when racemic than when enantiopure. Org Biomol Chem 2016; 13:9580-4. [PMID: 26327434 DOI: 10.1039/c5ob01652e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Helical peptide foldamers rich in α-aminoisobutyric acid (Aib) act as peptaibol-mimicking ionophores in the phospholipid bilayers of artificial vesicles. Racemic samples of these foldamers are more active than their enantiopure counterparts, which was attributed to differing propensities to form aggregates with crystal-like features in the bilayer.
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Affiliation(s)
- Sarah J Pike
- School of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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20
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Jones JE, Diemer V, Adam C, Raftery J, Ruscoe RE, Sengel JT, Wallace MI, Bader A, Cockroft SL, Clayden J, Webb SJ. Length-Dependent Formation of Transmembrane Pores by 310-Helical α-Aminoisobutyric Acid Foldamers. J Am Chem Soc 2016; 138:688-95. [PMID: 26699898 PMCID: PMC4752191 DOI: 10.1021/jacs.5b12057] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
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The synthetic biology toolbox lacks
extendable and conformationally
controllable yet easy-to-synthesize building blocks that are long
enough to span membranes. To meet this need, an iterative synthesis
of α-aminoisobutyric acid (Aib) oligomers was used to create
a library of homologous rigid-rod 310-helical foldamers,
which have incrementally increasing lengths and functionalizable N-
and C-termini. This library was used to probe the inter-relationship
of foldamer length, self-association strength, and ionophoric ability,
which is poorly understood. Although foldamer self-association in
nonpolar chloroform increased with length, with a ∼14-fold
increase in dimerization constant from Aib6 to Aib11, ionophoric activity in bilayers showed a stronger length
dependence, with the observed rate constant for Aib11 ∼70-fold
greater than that of Aib6. The strongest ionophoric activity
was observed for foldamers with >10 Aib residues, which have end-to-end
distances greater than the hydrophobic width of the bilayers used
(∼2.8 nm); X-ray crystallography showed that Aib11 is 2.93 nm long. These studies suggest that being long enough to
span the membrane is more important for good ionophoric activity than
strong self-association in the bilayer. Planar bilayer conductance
measurements showed that Aib11 and Aib13, but
not Aib7, could form pores. This pore-forming behavior
is strong evidence that Aibm (m ≥ 10) building blocks can span bilayers.
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Affiliation(s)
- Jennifer E Jones
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.,Manchester Institute of Biotechnology, University of Manchester , 131 Princess St, Manchester M1 7DN, United Kingdom
| | - Vincent Diemer
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.,Manchester Institute of Biotechnology, University of Manchester , 131 Princess St, Manchester M1 7DN, United Kingdom
| | - Catherine Adam
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.,School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - James Raftery
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Rebecca E Ruscoe
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom
| | - Jason T Sengel
- Department of Chemistry, University of Oxford , 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Mark I Wallace
- Department of Chemistry, University of Oxford , 12 Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Antoine Bader
- EaStCHEM School of Chemistry, University of Edinburgh , Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Scott L Cockroft
- EaStCHEM School of Chemistry, University of Edinburgh , Joseph Black Building, David Brewster Road, Edinburgh EH9 3FJ, United Kingdom
| | - Jonathan Clayden
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.,School of Chemistry, University of Bristol , Cantock's Close, Bristol BS8 1TS, United Kingdom
| | - Simon J Webb
- School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.,Manchester Institute of Biotechnology, University of Manchester , 131 Princess St, Manchester M1 7DN, United Kingdom
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21
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Ma L, Li Y, Meng L, Deng H, Li Y, Zhang Q, Diao A. Biological fluorination from the sea: discovery of a SAM-dependent nucleophilic fluorinating enzyme from the marine-derived bacterium Streptomyces xinghaiensis NRRL B24674. RSC Adv 2016. [DOI: 10.1039/c6ra00100a] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
The first ever marine originated fluorinating enzyme, which promises to be useful in biotransformation and synthetic biology, is described.
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Affiliation(s)
- Long Ma
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Yufeng Li
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Lingpei Meng
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Hai Deng
- Marine Biodiscovery Centre
- Department of Chemistry
- University of Aberdeen
- Aberdeen AB24 3UE
- UK
| | - Yuyin Li
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Qiang Zhang
- Tianjin 3rd Center Hospital
- Tianjin 300170
- China
| | - Aipo Diao
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
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22
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Ma L, Liu H, Wu G, Sun N, Meng L, Li Y, Liu Z, Diao A. A dual-channel detection of mercuric ions using a label free G-quadruplex-based DNAzyme molecule. Analyst 2016; 141:3997-4000. [DOI: 10.1039/c6an00795c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have constructed a ‘turn-off’ and label free bio-sensor using a DNAzyme molecule.
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Affiliation(s)
- Long Ma
- Biomolecular Sciences Research Complex
- EaStCHEM School of Chemistry
- University of St Andrews
- Fife KY16 9ST
- UK
| | - Haiyan Liu
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Guanrong Wu
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Nana Sun
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Lingpei Meng
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Yuyin Li
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Zhenxing Liu
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
| | - Aipo Diao
- Key Laboratory of Industrial Fermentation Microbiology
- Ministry of Education
- School of Biotechnology
- Tianjin University of Science & Technology
- Tianjin 300457
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23
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Yang RY, Bao CY, Lin QN, Zhu LY. A light-regulated synthetic ion channel constructed by an azobenzene modified hydraphile. CHINESE CHEM LETT 2015. [DOI: 10.1016/j.cclet.2015.05.010] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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24
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Beales PA, Ciani B, Cleasby AJ. Nature's lessons in design: nanomachines to scaffold, remodel and shape membrane compartments. Phys Chem Chem Phys 2015; 17:15489-507. [DOI: 10.1039/c5cp00480b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Our understanding of the membrane sculpting capabilities of proteins from experimental model systems could be used to construct functional compartmentalised architectures for the engineering of synthetic cells.
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Affiliation(s)
- Paul A. Beales
- School of Chemistry and Astbury Centre for Structural Molecular Biology
- University of Leeds
- Leeds LS2 9JT
- UK
| | - Barbara Ciani
- Centre for Membrane Interaction and Dynamics
- Department of Chemistry
- University of Sheffield
- Sheffield S3 7HF
- UK
| | - Alexa J. Cleasby
- Centre for Membrane Interaction and Dynamics
- Department of Chemistry
- University of Sheffield
- Sheffield S3 7HF
- UK
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25
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Muraoka T, Endo T, Tabata KV, Noji H, Nagatoishi S, Tsumoto K, Li R, Kinbara K. Reversible Ion Transportation Switch by a Ligand-Gated Synthetic Supramolecular Ion Channel. J Am Chem Soc 2014; 136:15584-95. [DOI: 10.1021/ja5070312] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Takahiro Muraoka
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1,
Katahira, Aoba-ku, Sendai 980-8577, Japan
- PRESTO, Japan Science and Technology Agency, 4-1-8, Honcho, Kawaguchi,
Saitama 332-0012, Japan
| | - Takahiro Endo
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1,
Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kazuhito V. Tabata
- Department
of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku,
Tokyo 113-8656, Japan
| | - Hiroyuki Noji
- Department
of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku,
Tokyo 113-8656, Japan
| | - Satoru Nagatoishi
- Department
of Bioengineering, The University of Tokyo, Bunkyo-ku, Tokyo 108-8656, Japan
| | - Kouhei Tsumoto
- Department
of Bioengineering, The University of Tokyo, Bunkyo-ku, Tokyo 108-8656, Japan
- Department
of Chemistry and Biotechnology, The University of Tokyo, Bunkyo-ku, Tokyo 108-8656, Japan
- Institute
of Medical Science, The University of Tokyo, 4-6-1, Shirokanedai, Minato-ku, Tokyo 108-8639, Japan
| | - Rui Li
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1,
Katahira, Aoba-ku, Sendai 980-8577, Japan
| | - Kazushi Kinbara
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1,
Katahira, Aoba-ku, Sendai 980-8577, Japan
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26
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Iengo E, Cavigli P, Milano D, Tecilla P. Metal mediated self-assembled porphyrin metallacycles: Synthesis and multipurpose applications. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.02.018] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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27
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Brown JRD, Pintre IC, Webb SJ. Fructose controlled ionophoric activity of a cholate-boronic acid. Org Biomol Chem 2014; 12:2576-83. [PMID: 24615337 DOI: 10.1039/c4ob00165f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Wulff-type boronic acids have been shown to act as ionophores at pH 8.2 by transporting Na(+) through phospholipid bilayers. A cholate-boronic acid conjugate was synthesised and shown to be an ionophore, although the hydroxyl-lined face of the cholate moiety did not enhance ion transport. Mechanistic studies suggested a carrier mechanism for Na(+) transport. The addition of fructose (>5 mM) strongly inhibited ionophoric activity of the cholate-boronic acid conjugate, mirrored by a strong decrease in the ability of this compound to partition into an organic phase. Modelling of the partitioning and ion transport data, using a fructose/boronic acid binding constant measured at pH 8.2, showed a good correlation with the extent of fructose/boronic acid complexation and suggested high polarity fructose/boronic acid complexes are poor ionophores. The sensitivity of ion transport to fructose implies that boronic acid-based antibiotic ionophores with activity modulated by polysaccharides in the surrounding environment may be accessible.
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Affiliation(s)
- James R D Brown
- Manchester Institute of Biotechnology (MIB) and School of Chemistry, University of Manchester, 131 Princess St., Manchester M1 7DN, UK.
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28
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Abstract
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Cells carefully control the transit of compounds through their membranes using “gated” protein channels that respond to chemical stimuli. Connexin gap junctions, which are high conductance cell-to-cell channels, are a remarkable class of “gated” channel with multiple levels of assembly. A gap junction between adhering cells comprises two half-channels in each cell membrane that adhere to each other to form a continuous cell-to-cell channel. Each half-channel is a hexameric assembly of six protein transmembrane subunits. These gap junctions display both intramembrane assembly and intermembrane assembly, making them an attractive target for biomimetic studies. Although many examples of self-assembled channels have been developed, few can also mediate intermembrane adhesion. Developing systems that combine membrane adhesion with controlled transit across the membrane would not only provide a better understanding of self-assembly in and around the membrane, but would also provide a route towards smart biomaterials, targeted drug delivery and an interface with nanotechnology. This Account describes our biomimetic approaches to combining membrane adhesion with membrane transport, using both self-assembled “sticky” pores and “sticky” nanoparticles to trigger transit across membranes. This combination links both fundamental and applied research, acting as a bridge between molecular level assembly and the formation of functional biomaterials. The ultimate goal is to create complex self-assembled systems in biological or biomimetic environments that can both interface with cells and transport compounds across bilayers in response to remote chemical or electromagnetic signals. Our research in this area started with fundamental studies of intramembrane and intermembrane self-assembly, building upon previously known channel-forming compounds to create self-assembled channels that were switchable or able to mediate vesicle–vesicle adhesion. Subsequently, nanoparticles with a “sticky” coating were used to mediate adhesion between vesicles. Combining these adhesive properties with the unique characteristics of nanosized magnetite allowed a noninvasive magnetic signal to trigger transport of compounds out of magnetic nanoparticle-vesicle assemblies. Adding an extravesicular matrix produced new responsive biomaterials for use in tissue engineering. These biomaterials can be magnetically patterned and can deliver drugs upon receipt of a magnetic signal, allowing spatiotemporal control over cellular responses.
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Affiliation(s)
- Simon J. Webb
- Manchester Institute of Biotechnology and the School of Chemistry, University of Manchester, 131 Princess St, Manchester M1 7DN, United Kingdom
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29
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Busseron E, Ruff Y, Moulin E, Giuseppone N. Supramolecular self-assemblies as functional nanomaterials. NANOSCALE 2013; 5:7098-140. [PMID: 23832165 DOI: 10.1039/c3nr02176a] [Citation(s) in RCA: 496] [Impact Index Per Article: 45.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
In this review, we survey the diversity of structures and functions which are encountered in advanced self-assembled nanomaterials. We highlight their flourishing implementations in three active domains of applications: biomedical sciences, information technologies, and environmental sciences. Our main objective is to provide the reader with a concise and straightforward entry to this broad field by selecting the most recent and important research articles, supported by some more comprehensive reviews to introduce each topic. Overall, this compilation illustrates how, based on the rules of supramolecular chemistry, the bottom-up approach to design functional objects at the nanoscale is currently producing highly sophisticated materials oriented towards a growing number of applications with high societal impact.
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Affiliation(s)
- Eric Busseron
- SAMS Research Group, University of Strasbourg, Institut Charles Sadron, CNRS, 23 rue du Loess, BP 84087, 67034 Strasbourg Cedex 2, France
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30
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Sakai N, Matile S. Synthetic ion channels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:9031-9040. [PMID: 23631769 DOI: 10.1021/la400716c] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The objective of this historical review is to recall the development of the field of synthetic ion channels over the past three decades. The most inspiring and influential breakthroughs with regard to structure and function are brought together to give the general reader an easily accessible understanding of the field. Pioneering work in the 1980s is followed by the golden age in the 1990s with structures emphasizing crown ethers, calixarenes, and peptide mimetics. Following the emergence of questions concerning specific functions such as ion selectivity, voltage gating, ligand gating and blockage, and with π-stacks, metal-organic scaffolds, and DNA origami, a new wave of innovative structures has emerged. The perspectives outline promising directions and major challenges waiting to be addressed.
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Affiliation(s)
- Naomi Sakai
- Department of Organic Chemistry, University of Geneva, Geneva, Switzerland
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31
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Abstract
A stable tetraporphyrin metallacycle with Re(I) corners (1) is capable of forming nanopores in a liposomial membrane, provided that the porphyrin units are properly functionalized with peripheral carboxylic acid residues that, by establishing an hydrogen bond network, allow the formation of dimers that span the depth of the membrane.
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Affiliation(s)
- Mariangela Boccalon
- Department of Chemical and Pharmaceutical Sciences, University of Trieste, via Giorgieri 1, I-34127, Trieste, Italy
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32
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Muraoka T, Shima T, Hamada T, Morita M, Takagi M, Tabata KV, Noji H, Kinbara K. Ion permeation by a folded multiblock amphiphilic oligomer achieved by hierarchical construction of self-assembled nanopores. J Am Chem Soc 2012; 134:19788-94. [PMID: 23145887 DOI: 10.1021/ja308342g] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A multiblock amphiphilic molecule 1, with a tetrameric alternating sequence of hydrophilic and hydrophobic units, adopts a folded structure in a liposomal membrane like a multipass transmembrane protein, and is able to transport alkali metal cations through the membrane. Hill's analysis and conductance measurements, analyzed by the Hille equation, revealed that the tetrameric assembly of 1 forms a 0.53 nm channel allowing for permeation of cations. Since neither 3, bearing flexible hydrophobic units and forming no stacked structures in the membrane, nor 2, a monomeric version of 1, is able to transport cations, the folded conformation of 1 in the membrane is likely essential for realizing its function. Thus, function and hierarchically formed higher-order structures of 1, is strongly correlated with each other like proteins and other biological macromolecules.
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Affiliation(s)
- Takahiro Muraoka
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai 980-8577, Japan.
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33
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Hsin TM, Wu K, Chellappan G. Magnetically immobilized nanoporous giant proteoliposomes as a platform for biosensing. Analyst 2012; 137:245-8. [DOI: 10.1039/c1an15565b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Devi U, Brown JRD, Almond A, Webb SJ. Pd(II)-mediated assembly of porphyrin channels in bilayer membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:1448-1456. [PMID: 21174428 DOI: 10.1021/la104152s] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A membrane-spanning bis(meso-3-pyridyl) porphyrin 1 has been synthesized, embedded in EYPC vesicles, and upon Pd(II) addition has been shown to form ionophores that allow the passage of anionic 5/6-carboxyfluorescein through membranes. The geometric matching of bis(meso-3-pyridyl) porphyrin 1 and trans-Pd(II) was designed to give a cyclic porphyrin trimer [PdCl(2)(1)](3). However, solution-phase studies showed that PdCl(2)(PhCN)(2) cross linked 1 into linear oligomers at porphyrin concentrations above 10 mM, although the formation of cyclic species was inferred from studies at concentrations below 2 μM. Fluorescence titrations showed that embedding porphyrin 1 in bilayers greatly reduced its affinity for Pd(II), but the combination of porphyrin 1 and Pd(II) gave an ionophoric species that increased the rate of 5/6-carboxyfluorescein (5/6-CF) transit through the phospholipid bilayer 12-fold. A maximum in the 5/6-CF release rate was observed at a Pd(II) concentration of 4 μM, and the application of a solution-phase binding model to the membrane phase showed that this peak in ionophoric activity corresponded to the greatest extent of porphyrin oligomerization. Further studies suggested these Pd(II)/porphyrin oligomers transported 5/6-CF via a channel mechanism.
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Affiliation(s)
- Usha Devi
- Manchester Interdisciplinary Biocentre, University of Manchester, Manchester, United Kingdom
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35
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Montenegro J, Braun J, Fischer-Onaca O, Meier W, Matile S. Synthetic polyion-counterion transport systems in polymersomes and gels. Org Biomol Chem 2011; 9:6623-8. [DOI: 10.1039/c1ob05835e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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