1
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Xue YW, Miura K, Itoh H, Inoue M. C-Terminal modification of polytheonamide B uncouples its dual functions in MCF-7 cancer cells. Chem Commun (Camb) 2023; 59:3914-3917. [PMID: 36919651 DOI: 10.1039/d2cc05915k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
Polytheonamide B (1) is an exceptionally large peptide that forms a transmembrane ion channel. The potent cytotoxicity of 1 against MCF-7 cancer cells originates from its two ion transport functions. Compound 1 depolarizes the plasma membrane and neutralizes acidic lysosomes. Here, we describe how we uncoupled these functions by designing and synthesizing new analogues of 1.
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Affiliation(s)
- Yun-Wei Xue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
| | - Kensuke Miura
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
| | - Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan.
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2
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Bondarenko M, Yaroshchuk A. Computational Design of an Electro-Membrane Microfluidic-Diode System. MEMBRANES 2023; 13:243. [PMID: 36837746 PMCID: PMC9959715 DOI: 10.3390/membranes13020243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 02/13/2023] [Accepted: 02/14/2023] [Indexed: 06/18/2023]
Abstract
This study uses computational design to explore the performance of a novel electro-membrane microfluidic diode consisting of physically conjugated nanoporous and micro-perforated ion-exchange layers. Previously, such structures have been demonstrated to exhibit asymmetric electroosmosis, but the model was unrealistic in several important respects. This numerical study investigates two quantitative measures of performance (linear velocity of net flow and efficiency) as functions of such principal system parameters as perforation size and spacing, the thickness of the nanoporous layer and the zeta potential of the pore surface. All of these dependencies exhibit pronounced maxima, which is of interest for future practical applications. The calculated linear velocities of net flows are in the range of several tens of liters per square meter per hour at realistically applied voltages. The system performance somewhat declines when the perforation size is increased from 2 µm to 128 µm (with a parallel increase of the inter-perforation spacing) but remains quite decent even for the largest perforation size. Such perforations should be relatively easy to generate using inexpensive equipment.
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Affiliation(s)
- Mykola Bondarenko
- F.D. Ovcharenko Institute of Bio-Colloid Chemistry, National Academy of Sciences of Ukraine, Vernadskiy ave.42, 03142 Kyiv, Ukraine
| | - Andriy Yaroshchuk
- ICREA, pg. L.Companys 23, 08010 Barcelona, Spain
- Department of Chemical Engineering, Polytechnic University of Catalonia–Barcelona Tech, av. Diagonal 647, 08028 Barcelona, Spain
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3
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Xin P, Xu L, Dong W, Mao L, Guo J, Bi J, Zhang S, Pei Y, Chen CP. Synthetic K + Channels Constructed by Rebuilding the Core Modules of Natural K + Channels in an Artificial System. Angew Chem Int Ed Engl 2023; 62:e202217859. [PMID: 36583482 DOI: 10.1002/anie.202217859] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 12/26/2022] [Accepted: 12/29/2022] [Indexed: 12/31/2022]
Abstract
Different types of natural K+ channels share similar core modules and cation permeability characteristics. In this study, we have developed novel artificial K+ channels by rebuilding the core modules of natural K+ channels in artificial systems. All the channels displayed high selectivity for K+ over Na+ and exhibited a selectivity sequence of K+ ≈Rb+ during the transport process, which is highly consistent with the cation permeability characteristics of natural K+ channels. More importantly, these artificial channels could be efficiently inserted into cell membranes and mediate the transmembrane transport of K+ , disrupting the cellular K+ homeostasis and eventually triggering the apoptosis of cells. These findings demonstrate that, by rebuilding the core modules of natural K+ channels in artificial systems, the structures, transport behaviors, and physiological functions of natural K+ channels can be mimicked in synthetic channels.
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Affiliation(s)
- Pengyang Xin
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Linqi Xu
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Wenpei Dong
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Linlin Mao
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Jingjing Guo
- Engineering Research Centre of Applied Technology on Machine Translation and Artificial Intelligence, Macao Polytechnic University, Macao, 999078, China
| | - Jingjing Bi
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Shouwei Zhang
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Yan Pei
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
| | - Chang-Po Chen
- Pingyuan Laboratory, NMPA (National Medical Products Administration) Key Laboratory for Research and Evaluation of Innovative Drug, Henan Key Laboratory of Organic Functional Molecule and Drug Innovation, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007, China
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4
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Hu YL, Hua Y, Pan ZQ, Qian JH, Yu XY, Bao N, Huo XL, Wu ZQ, Xia XH. PNP Nanofluidic Transistor with Actively Tunable Current Response and Ionic Signal Amplification. NANO LETTERS 2022; 22:3678-3684. [PMID: 35442043 DOI: 10.1021/acs.nanolett.2c00312] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Inspired by electronic transistors, electric field gating has been adopted to manipulate ionic currents of smart nanofluidic devices. Here, we report a PNP nanofluidic bipolar junction transistor (nBJT) consisting of one polyaniline (PANI) layer sandwiched between two polyethylene terephthalate (PET) nanoporous membranes. The PNP nBJT exhibits three different responses of currents (quasi-linear, rectification, and sigmoid) due to the counterbalance between surface charge distribution and base voltage applied in the nanofluidic channels; thus, they can be switched by base voltage. Four operating modes (cutoff, active, saturation, and breakdown mode) occur in the collector response currents. Under optimal conditions, the PNP nBJT exhibits an average current gain of up to 95 in 100 mM KCl solution at a low base voltage of 0.2 V. The present nBJT is promising for fabrication of nanofluidic devices with logical-control functions for analysis of single molecules.
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Affiliation(s)
- Yu-Lin Hu
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, China
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China
| | - Yu Hua
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, China
| | - Zhong-Qin Pan
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, China
| | - Jia-Han Qian
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China
| | - Xiao-Yang Yu
- School of Chemistry and Chemical Engineering, Nantong University, Nantong, Jiangsu 226019, China
| | - Ning Bao
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, China
| | - Xiao-Lei Huo
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, China
| | - Zeng-Qiang Wu
- School of Public Health, Nantong University, Nantong, Jiangsu 226019, China
| | - Xing-Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, Jiangsu 210023, China
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5
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Hou J, Jiang X, Yang F, Wang L, Yan T, Liu S, Xu J, Hou C, Luo Q, Liu J. Supramolecularly regulated artificial transmembrane signal transduction for 'ON/OFF'-switchable enzyme catalysis. Chem Commun (Camb) 2022; 58:5725-5728. [PMID: 35441622 DOI: 10.1039/d2cc01421a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
An artificial signal transduction model with a supramolecular recognition headgroup, a membrane anchoring group, and a pro-enzyme catalysis endgroup was constructed. The transmembrane translocation of the transducer can be reversibly regulated by competitive host-guest complexations as an input signal to control an enzyme reaction inside the lipid vesicles.
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Affiliation(s)
- Jinxing Hou
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China.
| | - Xiaojia Jiang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China.
| | - Feihu Yang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China.
| | - Liang Wang
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China.
| | - Tengfei Yan
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
| | - Shengda Liu
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
| | - Jiayun Xu
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
| | - Chunxi Hou
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China.
| | - Quan Luo
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China. .,Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, School of Life Sciences, Jilin University, Changchun 130012, China.,Key Laboratory of Emergency and Trauma, Ministry of Education, College of Emergency and Trauma, Hainan Medical University, Haikou 571199, China
| | - Junqiu Liu
- State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Road, Changchun 130012, China. .,College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, China
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6
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Meyer N, Abrao-Nemeir I, Janot JM, Torrent J, Lepoitevin M, Balme S. Solid-state and polymer nanopores for protein sensing: A review. Adv Colloid Interface Sci 2021; 298:102561. [PMID: 34768135 DOI: 10.1016/j.cis.2021.102561] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Revised: 10/29/2021] [Accepted: 10/31/2021] [Indexed: 01/15/2023]
Abstract
In two decades, the solid state and polymer nanopores became attractive method for the protein sensing with high specificity and sensitivity. They also allow the characterization of conformational changes, unfolding, assembly and aggregation as well the following of enzymatic reaction. This review aims to provide an overview of the protein sensing regarding the technique of detection: the resistive pulse and ionic diodes. For each strategy, we report the most significant achievement regarding the detection of peptides and protein as well as the conformational change, protein-protein assembly and aggregation process. We discuss the limitations and the recent strategies to improve the nanopore resolution and accuracy. A focus is done about concomitant problematic such as protein adsorption and nanopore lifetime.
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7
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Ma P, Zheng J, Zhao D, Zhang W, Lu G, Lin L, Zhao Z, Huang Z, Cao L. The Selective Transport of Ions in Charged Nanopore with Combined Multi-Physics Fields. MATERIALS 2021; 14:ma14227012. [PMID: 34832413 PMCID: PMC8622219 DOI: 10.3390/ma14227012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Revised: 11/01/2021] [Accepted: 11/10/2021] [Indexed: 01/03/2023]
Abstract
The selective transport of ions in nanopores attracts broad interest due to their potential applications in chemical separation, ion filtration, seawater desalination, and energy conversion. The ion selectivity based on the ion dehydration and steric hindrance is still limited by the very similar diameter between different hydrated ions. The selectivity can only separate specific ion species, lacking a general separation effect. Herein, we report the highly ionic selective transport in charged nanopore through the combination of hydraulic pressure and electric field. Based on the coupled Poisson–Nernst–Planck (PNP) and Navier–Stokes (NS) equations, the calculation results suggest that the coupling of hydraulic pressure and electric field can significantly enhance the ion selectivity compared to the results under the single driven force of hydraulic pressure or electric field. Different from the material-property-based ion selective transport, this method endows the general separation effect between different kinds of ions. Through the appropriate combination of hydraulic pressure and electric field, an extremely high selectivity ratio can be achieved. Further in-depth analysis reveals the influence of nanopore diameter, surface charge density and ionic strength on the selectivity ratio. These findings provide a potential route for high-performance ionic selective transport and separation in nanofluidic systems.
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Affiliation(s)
- Pengfei Ma
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
| | - Jianxiang Zheng
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
- Fujian Research Center for Nuclear Engineering, Xiamen 361005, China
| | - Danting Zhao
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
| | - Wenjie Zhang
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
| | - Gonghao Lu
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
| | - Lingxin Lin
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
| | - Zeyuan Zhao
- Fujian Key Laboratory of Functional Marine Sensing Materials, Minjiang University, Fuzhou 350108, China;
| | - Zijing Huang
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
- Fujian Research Center for Nuclear Engineering, Xiamen 361005, China
- Correspondence: (Z.H.); (L.C.)
| | - Liuxuan Cao
- College of Energy, Xiamen University, Xiamen 361005, China; (P.M.); (J.Z.); (D.Z.); (W.Z.); (G.L.); (L.L.)
- Fujian Research Center for Nuclear Engineering, Xiamen 361005, China
- Correspondence: (Z.H.); (L.C.)
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8
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Tang YJ, Zhang SJ, Zhong ZT, Su WM, Zhao YD. Controllable ion transport induced by pH gradient in a thermally crosslinked submicrochannel heterogeneous membrane. Analyst 2021; 146:6815-6821. [PMID: 34643194 DOI: 10.1039/d1an01522b] [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
Solid-state nanochannels have attracted considerable attention for their similar ion transport properties to biological ion channels. The construction of porous ion channels with good stability at the submicro/micrometer scale is very beneficial to develop large-area ion channel devices. In this manuscript, based on in-situ thermal crosslinking of a small organic molecule containing triphenylamine and styrene groups, we construct a heterogeneous membrane with asymmetrical charge and wettability on cylindrical anodic aluminum oxide (AAO) channels (D ≈ 319 nm). This heterogeneous membrane has typical ion current rectification characteristics with a high rectification ratio of 36.9 and good stability. This work provides an effective strategy for the construction of submicrochannel heterogeneous membranes and also broadens the application range of bionic ion channels.
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Affiliation(s)
- Yuan-Ju Tang
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics - Hubei Bioinformatics & Molecular Imaging Key Laboratory, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China. .,Department of Public Fundamental Courses, West Yunnan University of Applied Sciences, Dali 671000, Yunnan, P. R. China
| | - Shu-Jie Zhang
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics - Hubei Bioinformatics & Molecular Imaging Key Laboratory, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China.
| | - Zi-Tao Zhong
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics - Hubei Bioinformatics & Molecular Imaging Key Laboratory, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China.
| | - Wen-Ming Su
- Printable Electronics Research Center, Suzhou Institute of Nano-Technology and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, Jiangsu, P. R. China
| | - Yuan-Di Zhao
- Britton Chance Center for Biomedical Photonics at Wuhan National Laboratory for Optoelectronics - Hubei Bioinformatics & Molecular Imaging Key Laboratory, Department of Biomedical Engineering, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China. .,Key Laboratory of Biomedical Photonics (HUST), Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, Hubei, P. R. China
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9
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Nazari M, Davoodabadi A, Huang D, Luo T, Ghasemi H. Transport Phenomena in Nano/Molecular Confinements. ACS NANO 2020; 14:16348-16391. [PMID: 33253531 DOI: 10.1021/acsnano.0c07372] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The transport of fluid and ions in nano/molecular confinements is the governing physics of a myriad of embodiments in nature and technology including human physiology, plants, energy modules, water collection and treatment systems, chemical processes, materials synthesis, and medicine. At nano/molecular scales, the confinement dimension approaches the molecular size and the transport characteristics deviates significantly from that at macro/micro scales. A thorough understanding of physics of transport at these scales and associated fluid properties is undoubtedly critical for future technologies. This compressive review provides an elaborate picture on the promising future applications of nano/molecular transport, highlights experimental and simulation metrologies to probe and comprehend this transport phenomenon, discusses the physics of fluid transport, tunable flow by orders of magnitude, and gating mechanisms at these scales, and lists the advancement in the fabrication methodologies to turn these transport concepts into reality. Properties such as chain-like liquid transport, confined gas transport, surface charge-driven ion transport, physical/chemical ion gates, and ion diodes will provide avenues to devise technologies with enhanced performance inaccessible through macro/micro systems. This review aims to provide a consolidated body of knowledge to accelerate innovation and breakthrough in the above fields.
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Affiliation(s)
- Masoumeh Nazari
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Road, Houston, Texas 77204, United States
| | - Ali Davoodabadi
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Road, Houston, Texas 77204, United States
| | - Dezhao Huang
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Tengfei Luo
- Department of Aerospace and Mechanical Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
- Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Hadi Ghasemi
- Department of Mechanical Engineering, University of Houston, 4726 Calhoun Road, Houston, Texas 77204, United States
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10
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Muraoka T, Noguchi D, Kasai RS, Sato K, Sasaki R, Tabata KV, Ekimoto T, Ikeguchi M, Kamagata K, Hoshino N, Noji H, Akutagawa T, Ichimura K, Kinbara K. A synthetic ion channel with anisotropic ligand response. Nat Commun 2020; 11:2924. [PMID: 32522996 PMCID: PMC7287108 DOI: 10.1038/s41467-020-16770-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Accepted: 05/26/2020] [Indexed: 12/04/2022] Open
Abstract
Biological membranes play pivotal roles in the cellular activities. Transmembrane proteins are the central molecules that conduct membrane-mediated biochemical functions such as signal transduction and substance transportation. Not only the molecular functions but also the supramolecular properties of the transmembrane proteins such as self-assembly, delocalization, orientation and signal response are essential for controlling cellular activities. Here we report anisotropic ligand responses of a synthetic multipass transmembrane ion channel. An unsymmetrical molecular structure allows for oriented insertion of the synthetic amphiphile to a bilayer by addition to a pre-formed membrane. Complexation with a ligand prompts ion transportation by forming a supramolecular channel, and removal of the ligand deactivates the transportation function. Biomimetic regulation of the synthetic channel by agonistic and antagonistic ligands is also demonstrated not only in an artificial membrane but also in a biological membrane of a living cell. Transmembrane proteins are important for cellular functions and synthetic analogues are of interest. Here the authors report on the design and testing of a synthetic multipass transmembrane channel which shows anisotropic responses to agonistic and antagonistic ligands.
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Affiliation(s)
- Takahiro Muraoka
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan. .,Precursory Research for Embryonic Science and Technology, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan.
| | - Daiki Noguchi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Rinshi S Kasai
- Institute for Frontier Life and Medical Sciences, Kyoto University, Shougoin, Kyoto, 606-8507, Japan
| | - Kohei Sato
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Ryo Sasaki
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Kazuhito V Tabata
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Toru Ekimoto
- Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan
| | - Mitsunori Ikeguchi
- Graduate School of Medical Life Science, Yokohama City University, 1-7-29 Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan.,Medical Sciences Innovation Hub Program RIKEN, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, 230-0045, Japan
| | - Kiyoto Kamagata
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Norihisa Hoshino
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Hiroyuki Noji
- Department of Applied Chemistry, School of Engineering, The University of Tokyo, Bunkyo-ku, Tokyo, 113-8656, Japan
| | - Tomoyuki Akutagawa
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Kazuaki Ichimura
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan
| | - Kazushi Kinbara
- School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama, 226-8503, Japan. .,Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan.
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11
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Mao J, Itoh H, Sakurai K, Inoue M. Phospholipid-Dependent Functions of a Macrocyclic Analogue of the Ion-Channel-Forming Antibiotic Gramicidin A. Chem Pharm Bull (Tokyo) 2020; 68:173-178. [PMID: 32009085 DOI: 10.1248/cpb.c19-00967] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
An ion-channel-forming natural peptide, gramicidin A (1), exhibits potent antimicrobial activity against Gram-positive bacteria, although medical applications are limited to topical use due to its mammalian cytotoxicity. We recently reported that the artificial macrocyclic analogue 2 provides a promising starting point for developing new ion-channel-based systemic antibacterial agents because of its low mammalian cytotoxicity compared to that of the parent 1. To dissect the molecular factors involved in the species selectivity of 2, we evaluated the ion transport activities, phospholipid affinities, and conformational properties of 1 and 2 using various compositions of phospholipids. A combination of lipid dot blot assays and circular dichroism (CD) analysis with H+/Na+ exchange assays revealed that the higher H+/Na+ exchange activity of 2 than that of 1 in liposomes containing 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine (POPC) or 1-palmitoyl-2-oleoyl-sn-glycero-3-phospho-(1'-rac-glycerol) (POPG) is attributable to its higher affinity towards the phospholipids than that of 1. Notably, we also discovered that 2 showed weaker H+/Na+ exchange activity in liposomes containing 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylethanolamine (POPE). CD analysis of 2 in liposomes indicated that the weak H+/Na+ exchange activity is induced by disturbance of the ion-conducting β6.3-helical conformation in the POPE-containing lipid bilayer. These results suggest that the POPE-induced attenuation of the ion-conducting activity of 2 contributes to the alleviation of undesirable mammalian cytotoxicity of 2 compared to that of 1.
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Affiliation(s)
- Ji Mao
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
| | - Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
| | - Kaori Sakurai
- Department of Biotechnology and Life Science, Tokyo University of Agriculture and Technology
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
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12
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Xin P, Zhao L, Mao L, Xu L, Hou S, Kong H, Fang H, Zhu H, Jiang T, Chen CP. Effect of charge status on the ion transport and antimicrobial activity of synthetic channels. Chem Commun (Camb) 2020; 56:13796-13799. [DOI: 10.1039/d0cc05730d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The charge status of channels formed by pillararene–gramicidin hybrid molecules has a significant impact on their trans-membrane transport properties, membrane-association abilities and antimicrobial activities.
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13
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Eggenberger OM, Ying C, Mayer M. Surface coatings for solid-state nanopores. NANOSCALE 2019; 11:19636-19657. [PMID: 31603455 DOI: 10.1039/c9nr05367k] [Citation(s) in RCA: 56] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Since their introduction in 2001, solid-state nanopores have been increasingly exploited for the detection and characterization of biomolecules ranging from single DNA strands to protein complexes. A major factor that enables the application of nanopores to the analysis and characterization of a broad range of macromolecules is the preparation of coatings on the pore wall to either prevent non-specific adhesion of molecules or to facilitate specific interactions of molecules of interest within the pore. Surface coatings can therefore be useful to minimize clogging of nanopores or to increase the residence time of target analytes in the pore. This review article describes various coatings and their utility for changing pore diameters, increasing the stability of nanopores, reducing non-specific interactions, manipulating surface charges, enabling interactions with specific target molecules, and reducing the noise of current recordings through nanopores. We compare the coating methods with respect to the ease of preparing the coating, the stability of the coating and the requirement for specialized equipment to prepare the coating.
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Affiliation(s)
- Olivia M Eggenberger
- Adolphe Merkle Institute, Chemin des Verdiers 4, University of Fribourg, Fribourg, Switzerland.
| | - Cuifeng Ying
- Adolphe Merkle Institute, Chemin des Verdiers 4, University of Fribourg, Fribourg, Switzerland.
| | - Michael Mayer
- Adolphe Merkle Institute, Chemin des Verdiers 4, University of Fribourg, Fribourg, Switzerland.
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14
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Wu Y, Yang G, Lin M, Kong X, Mi L, Liu S, Chen G, Tian Y, Jiang L. Continuously Tunable Ion Rectification and Conductance in Submicrochannels Stemming from Thermoresponsive Polymer Self‐Assembly. Angew Chem Int Ed Engl 2019; 58:12481-12485. [DOI: 10.1002/anie.201906360] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Indexed: 01/16/2023]
Affiliation(s)
- Yafeng Wu
- School of Chemistry and Chemical EngineeringSoutheast University Nanjing 211189 China
| | - Guang Yang
- Fudan UniversityState Key Lab Mol Engn Polymers Shanghai 200433 P. R. China
| | - Mingchang Lin
- Fudan UniversityState Key Lab Mol Engn Polymers Shanghai 200433 P. R. China
| | - Xiangyu Kong
- Beijing National Laboratory for Molecular Sciences (BNLMS)Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
| | - Li Mi
- School of Chemistry and Chemical EngineeringSoutheast University Nanjing 211189 China
| | - Songqin Liu
- School of Chemistry and Chemical EngineeringSoutheast University Nanjing 211189 China
| | - Guosong Chen
- Fudan UniversityState Key Lab Mol Engn Polymers Shanghai 200433 P. R. China
| | - Ye Tian
- Beijing National Laboratory for Molecular Sciences (BNLMS)Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
| | - Lei Jiang
- Beijing National Laboratory for Molecular Sciences (BNLMS)Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
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15
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Wu Y, Yang G, Lin M, Kong X, Mi L, Liu S, Chen G, Tian Y, Jiang L. Continuously Tunable Ion Rectification and Conductance in Submicrochannels Stemming from Thermoresponsive Polymer Self‐Assembly. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906360] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Yafeng Wu
- School of Chemistry and Chemical EngineeringSoutheast University Nanjing 211189 China
| | - Guang Yang
- Fudan UniversityState Key Lab Mol Engn Polymers Shanghai 200433 P. R. China
| | - Mingchang Lin
- Fudan UniversityState Key Lab Mol Engn Polymers Shanghai 200433 P. R. China
| | - Xiangyu Kong
- Beijing National Laboratory for Molecular Sciences (BNLMS)Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
| | - Li Mi
- School of Chemistry and Chemical EngineeringSoutheast University Nanjing 211189 China
| | - Songqin Liu
- School of Chemistry and Chemical EngineeringSoutheast University Nanjing 211189 China
| | - Guosong Chen
- Fudan UniversityState Key Lab Mol Engn Polymers Shanghai 200433 P. R. China
| | - Ye Tian
- Beijing National Laboratory for Molecular Sciences (BNLMS)Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
| | - Lei Jiang
- Beijing National Laboratory for Molecular Sciences (BNLMS)Key Laboratory of Organic SolidsInstitute of ChemistryChinese Academy of Sciences Beijing 100190 P. R. China
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16
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Haoyang W, Zhang M, Hou J. Deformylated Gramicidin A and Its Derivatives Showing High Antimicrobial Activity and Low Hemolytic Toxicity. CHINESE J CHEM 2018. [DOI: 10.1002/cjoc.201800451] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Wei‐Wei Haoyang
- Department of ChemistryFudan University 220 Handan Road, Shanghai 200433 China
| | - Min Zhang
- Department of ChemistryFudan University 220 Handan Road, Shanghai 200433 China
| | - Jun‐Li Hou
- Department of ChemistryFudan University 220 Handan Road, Shanghai 200433 China
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17
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Kim YH, Hang L, Cifelli JL, Sept D, Mayer M, Yang J. Frequency-Based Analysis of Gramicidin A Nanopores Enabling Detection of Small Molecules with Picomolar Sensitivity. Anal Chem 2018; 90:1635-1642. [DOI: 10.1021/acs.analchem.7b02961] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
| | | | | | - David Sept
- Department
of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan 48109-2110, United States
| | - Michael Mayer
- Adolphe
Merkle Institute, University of Fribourg, Chemin des Verdiers 4, 1700 Fribourg, Switzerland
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18
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Abstract
The controllable synthetic ion channels with voltage-, ligand- light- and mechano-gating, as well as rectifying behaviours are discussed in regarding to their construction strategies and functions.
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Affiliation(s)
- Jian-Yu Chen
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
| | - Jun-Li Hou
- Department of Chemistry
- Fudan University
- Shanghai 200433
- China
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19
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He X, Zhang K, Li T, Jiang Y, Yu P, Mao L. Micrometer-Scale Ion Current Rectification at Polyelectrolyte Brush-Modified Micropipets. J Am Chem Soc 2017; 139:1396-1399. [DOI: 10.1021/jacs.6b11696] [Citation(s) in RCA: 82] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Xiulan He
- Beijing
National Laboratory for Molecular Science, Key Laboratory of Analytical
Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Kailin Zhang
- Beijing
National Laboratory for Molecular Science, Key Laboratory of Analytical
Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Ting Li
- Beijing
National Laboratory for Molecular Science, Key Laboratory of Analytical
Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yanan Jiang
- Beijing
National Laboratory for Molecular Science, Key Laboratory of Analytical
Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
| | - Ping Yu
- Beijing
National Laboratory for Molecular Science, Key Laboratory of Analytical
Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lanqun Mao
- Beijing
National Laboratory for Molecular Science, Key Laboratory of Analytical
Chemistry for Living Biosystems, Institute of Chemistry, the Chinese Academy of Sciences, Beijing 100190, China
- University of Chinese Academy of Sciences, Beijing 100049, China
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20
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Su G, Zhang M, Si W, Li ZT, Hou JL. Directional Potassium Transport through a Unimolecular Peptide Channel. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608428] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ge Su
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 China
| | - Min Zhang
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 China
| | - Wen Si
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 China
| | - Zhan-Ting Li
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 China
| | - Jun-Li Hou
- Department of Chemistry; Fudan University; 220 Handan Road Shanghai 200433 China
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21
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Su G, Zhang M, Si W, Li Z, Hou J. Directional Potassium Transport through a Unimolecular Peptide Channel. Angew Chem Int Ed Engl 2016; 55:14678-14682. [DOI: 10.1002/anie.201608428] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Ge Su
- Department of Chemistry Fudan University 220 Handan Road Shanghai 200433 China
| | - Min Zhang
- Department of Chemistry Fudan University 220 Handan Road Shanghai 200433 China
| | - Wen Si
- Department of Chemistry Fudan University 220 Handan Road Shanghai 200433 China
| | - Zhan‐Ting Li
- Department of Chemistry Fudan University 220 Handan Road Shanghai 200433 China
| | - Jun‐Li Hou
- Department of Chemistry Fudan University 220 Handan Road Shanghai 200433 China
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22
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Jiang Y, Li X, Wang X, Wang Z, Zhang J, Wu J, Xu W. Design, synthesis, and biological characterization of tamibarotene analogs as anticancer agents. Chem Biol Drug Des 2016; 88:542-55. [PMID: 27113097 DOI: 10.1111/cbdd.12778] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Revised: 04/01/2016] [Accepted: 04/18/2016] [Indexed: 12/25/2022]
Abstract
In our efforts of developing novel compounds as potential anticancer agents, a series of tamibarotene analogs containing Zn(2+) -binding moieties were designed and developed. Biological characterization identified compound 7b as the most potent one with improved antiproliferative activities against multiple cancer cell lines, compared to parent compound tamibarotene. Further characterization also demonstrated that compound 7b exhibited moderate activities as a histone deacetylase inhibitor with IC50 of 1.8 ± 0.1 μm, thus suggesting that this could contribute to the improved antiproliferative activities of 7b. Pharmacokinetic studies revealed that compound 7b could release tamibarotene after administration and prolong the circulation time of tamibarotene, and this may also potentially contribute to the improved antiproliferative activities. Collectively, the results demonstrated that compound 7b could serve as a new lead for further development of more potent analogs as potential anticancer agents.
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Affiliation(s)
- Yuqi Jiang
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, Ji'nan, Shandong, China
| | - Xiaoyang Li
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, Ji'nan, Shandong, China
| | - Xue Wang
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, Ji'nan, Shandong, China
| | - Zhonglan Wang
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, Ji'nan, Shandong, China
| | - Jian Zhang
- College of Pharmacy, Weifang Medical University, Wei'fang, Shandong, China
| | - Jingde Wu
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, Ji'nan, Shandong, China.
| | - Wenfang Xu
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, Ji'nan, Shandong, China.
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23
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Rodríguez-Vázquez N, Fuertes A, Amorín M, Granja JR. Bioinspired Artificial Sodium and Potassium Ion Channels. Met Ions Life Sci 2016; 16:485-556. [DOI: 10.1007/978-3-319-21756-7_14] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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24
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Small LJ, Wheeler DR, Spoerke ED. Nanoporous membranes with electrochemically switchable, chemically stabilized ionic selectivity. NANOSCALE 2015; 7:16909-20. [PMID: 26411335 DOI: 10.1039/c5nr02939b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Nanopore size, shape, and surface charge all play important roles in regulating ionic transport through nanoporous membranes. The ability to control these parameters in situ provides a means to create ion transport systems tunable in real time. Here, we present a new strategy to address this challenge, utilizing three unique electrochemically switchable chemistries to manipulate the terminal functional group and control the resulting surface charge throughout ensembles of gold plated nanopores in ion-tracked polycarbonate membranes 3 cm(2) in area. We demonstrate the diazonium mediated surface functionalization with (1) nitrophenyl chemistry, (2) quinone chemistry, and (3) previously unreported trimethyl lock chemistry. Unlike other works, these chemistries are chemically stabilized, eliminating the need for a continuously applied gate voltage to maintain a given state and retain ionic selectivity. The effect of surface functionalization and nanopore geometry on selective ion transport through these functionalized membranes is characterized in aqueous solutions of sodium chloride at pH = 5.7. The nitrophenyl surface allows for ionic selectivity to be irreversibly switched in situ from cation-selective to anion-selective upon reduction to an aminophenyl surface. The quinone-terminated surface enables reversible changes between no ionic selectivity and a slight cationic selectivity. Alternatively, the trimethyl lock allows ionic selectivity to be reversibly switched by up to a factor of 8, approaching ideal selectivity, as a carboxylic acid group is electrochemically revealed or hidden. By varying the pore shape from cylindrical to conical, it is demonstrated that a controllable directionality can be imparted to the ionic selectivity. Combining control of nanopore geometry with stable, switchable chemistries facilitates superior control of molecular transport across the membrane, enabling tunable ion transport systems.
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Affiliation(s)
- Leo J Small
- Sandia National Laboratories, PO Box 5800, MS 1411, Albuquerque, NM, USA 87185.
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25
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Cho EC, Hsiao YS, Lee KC, Huang JH. Few-layer graphene based sponge as a highly efficient, recyclable and selective sorbent for organic solvents and oils. RSC Adv 2015. [DOI: 10.1039/c5ra06737e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this work, we illustrate a facile and economical strategy for the bulk production of aqueous few layer graphene (FLG) dispersions via a simple grinding method.
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Affiliation(s)
- Er-Chieh Cho
- Department of Clinical Pharmacy
- School of Pharmacy
- College of Pharmacy
- Taipei Medical University
- Taipei
| | - Yu-Sheng Hsiao
- Department of Materials Engineering
- Ming Chi University of Technology
- New Taipei City
- Taiwan
| | - Kuen-Chan Lee
- Department of Fragrance and Cosmetic Science
- Kaohsiung Medical University
- Kaohsiung
- Taiwan
| | - Jen-Hsien Huang
- Department of Green Material Technology
- Green Technology Research Institute
- CPC Corporation
- Kaohsiung
- Taiwan
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26
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Mao J, Kuranaga T, Hamamoto H, Sekimizu K, Inoue M. Rational Design, Synthesis, and Biological Evaluation of Lactam-Bridged Gramicidin A Analogues: Discovery of a Low-Hemolytic Antibacterial Peptide. ChemMedChem 2014; 10:540-5. [DOI: 10.1002/cmdc.201402473] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Indexed: 11/09/2022]
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27
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Ali M, Ramirez P, Nasir S, Nguyen QH, Ensinger W, Mafe S. Current rectification by nanoparticle blocking in single cylindrical nanopores. NANOSCALE 2014; 6:10740-10745. [PMID: 25100503 DOI: 10.1039/c4nr02968b] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Blocking of a charged pore by an oppositely charged nanoparticle can support rectifying properties in a cylindrical nanopore, as opposed to the usual case of a fixed asymmetry in the pore geometry and charge distribution. We present here experimental data and model calculations to confirm this fundamental effect. The nanostructure imaging and the effects of nanoparticle concentration, pore radius, and salt concentration on the electrical conductance-voltage (G-V) curves are discussed. Logic responses based on chemical and electrical inputs/outputs could also be implemented with a single pore acting as an effective nanofluidic diode. To better show the generality of the results, different charge states and relative sizes of the nanopore and the nanoparticle are considered, emphasizing those physical concepts that are also found in the ionic drug blocking of protein ion channels.
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Affiliation(s)
- Mubarak Ali
- Materials Research Dept., GSI Helmholtzzentrum für Schwerionen-forschung, Planckstrasse 1, D-64291, Darmstadt, Germany.
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28
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Gurnev PA, Nestorovich EM. Channel-forming bacterial toxins in biosensing and macromolecule delivery. Toxins (Basel) 2014; 6:2483-540. [PMID: 25153255 PMCID: PMC4147595 DOI: 10.3390/toxins6082483] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 08/08/2014] [Accepted: 08/08/2014] [Indexed: 12/19/2022] Open
Abstract
To intoxicate cells, pore-forming bacterial toxins are evolved to allow for the transmembrane traffic of different substrates, ranging from small inorganic ions to cell-specific polypeptides. Recent developments in single-channel electrical recordings, X-ray crystallography, protein engineering, and computational methods have generated a large body of knowledge about the basic principles of channel-mediated molecular transport. These discoveries provide a robust framework for expansion of the described principles and methods toward use of biological nanopores in the growing field of nanobiotechnology. This article, written for a special volume on "Intracellular Traffic and Transport of Bacterial Protein Toxins", reviews the current state of applications of pore-forming bacterial toxins in small- and macromolecule-sensing, targeted cancer therapy, and drug delivery. We discuss the electrophysiological studies that explore molecular details of channel-facilitated protein and polymer transport across cellular membranes using both natural and foreign substrates. The review focuses on the structurally and functionally different bacterial toxins: gramicidin A of Bacillus brevis, α-hemolysin of Staphylococcus aureus, and binary toxin of Bacillus anthracis, which have found their "second life" in a variety of developing medical and technological applications.
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Affiliation(s)
- Philip A Gurnev
- Physics Department, University of Massachusetts, Amherst, MA 01003, USA.
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29
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Guan W, Li SX, Reed MA. Voltage gated ion and molecule transport in engineered nanochannels: theory, fabrication and applications. NANOTECHNOLOGY 2014; 25:122001. [PMID: 24570414 DOI: 10.1088/0957-4484/25/12/122001] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Nanochannels remain at the focus of growing scientific and technological interest. The nanometer scale of the structure allows the discovery of a new range of phenomena that has not been possible in traditional microchannels, among which a direct field effect control over the charges in nanochannels is very attractive for various applications, since it offers a unique opportunity to integrate wet ionics with dry electronics seamlessly. This review will focus on the voltage gated ionic and molecular transport in engineered gated nanochannels. We will present an overview of the transport theory. Fabrication techniques regarding the gated nanostructures will also be discussed. In addition, various applications using the voltage gated nanochannels are outlined, which involves biological and chemical analysis, and energy conversion.
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Affiliation(s)
- Weihua Guan
- Department of Electrical Engineering, Yale University, New Haven, CT 06520, USA
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30
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Aguilella VM, Verdiá-Báguena C, Alcaraz A. Lipid charge regulation of non-specific biological ion channels. Phys Chem Chem Phys 2014; 16:3881-93. [DOI: 10.1039/c3cp54690j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lipid charge regulation effects in different protein–lipid conformations highlight the role of electrostatic interactions in conductance and selectivity of non-specific biological ion channels.
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Affiliation(s)
| | | | - Antonio Alcaraz
- Dept. Physics
- Lab. Molecular Biophysics
- Universitat Jaume I
- 12080 Castellón, Spain
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31
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Abstract
Ion channels provide a conductance pathway for the passive transport of ions across membranes. These functional molecules perform key tasks in biological systems such as neuronal signaling, muscular control, and sensing. Recently, function-oriented synthesis researchers began to focus on ion channels with the goal of modifying the function of existing ion channels (ion selectivity, gating) or creating new channels with novel functions. Both approaches, ion channel engineering and de novo design, have involved synthetic chemists, biochemists, structural biologists, and neurochemists. Researchers characterize the function of ion channels by measuring their conductance in samples of biological membranes (patch clamp) or artificial membranes (planar lipid bilayers). At the single molecule level, these measurements require special attention to the purity of the sample, a challenge that synthetic chemists should be aware of. Ideally, researchers study the function of channels while also acquiring structural data (X-ray, NMR) to understand and predict how synthetic modifications alter channel function. Long-term oriented researchers would like to apply synthetic ion channels to single molecule sensing and to implantat these synthetic systems in living organisms as tools or for the treatment of channelopathies. In this Account, we discuss our own work on synthetic ion channels and explain the shift of our research focus from a de novo design of oligo-THFs and oligo-THF-amino acids to ion channel engineering. We introduce details about two biological lead structures for ion channel engineering: the gramicidin β(6,3) helix as an example of a channel with a narrow ion conductance pathway and the outer membrane porins (OmpF, OmpG) with their open β-barrel structure. The increase and the reversal of ion selectivity of these systems and the hydrophobic match/mismatch of the channel with the phospholipid bilayer are of particular interest. For engineering ion channels, we need to supplement the single-point attachment of a synthetic modulator with the synthesis of a more challenging two-point attachment. The successful function-oriented synthesis of ion channels will require interdisciplinary efforts that include new electrophysiology techniques, efficient synthesis (peptide/protein/organic), and good structural analysis.
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Affiliation(s)
- Philipp Reiß
- Fachbereich Chemie, Philipps-Universität Marburg, Hans Meerwein Strasse, 35032 Marburg, Germany
| | - Ulrich Koert
- Fachbereich Chemie, Philipps-Universität Marburg, Hans Meerwein Strasse, 35032 Marburg, Germany
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32
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Mayer M, Yang J. Engineered ion channels as emerging tools for chemical biology. Acc Chem Res 2013; 46:2998-3008. [PMID: 23932142 DOI: 10.1021/ar400129t] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Over the last 25 years, researchers have developed exogenously expressed, genetically engineered, semi-synthetic, and entirely synthetic ion channels. These structures have sufficient fidelity to serve as unique tools that can reveal information about living organisms. One of the most exciting success stories is optogenetics: the use of light-gated channels to trigger action potentials in specific neurons combined with studies of the response from networks of cells or entire live animals. Despite this breakthrough, the use of molecularly engineered ion channels for studies of biological systems is still in its infancy. Historically, researchers studied ion channels in the context of their own function in single cells or in multicellular signaling and regulation. Only recently have researchers considered ion channels and pore-forming peptides as responsive tools to report on the chemical and physical changes produced by other biochemical processes and reactions. This emerging class of molecular probes has a number of useful characteristics. For instance, these structures can greatly amplify the signal of chemical changes: the binding of one molecule to a ligand-gated ion channel can result in flux of millions of ions across a cell membrane. In addition, gating occurs on sub-microsecond time scales, resulting in fast response times. Moreover, the signal is complementary to existing techniques because the output is ionic current rather than fluorescence or radioactivity. And finally, ion channels are also localized at the membrane of cells where essential processes such as signaling and regulation take place. This Account highlights examples, mostly from our own work, of uses of ion channels and pore-forming peptides such as gramicidin in chemical biology. We discuss various strategies for preparing synthetically tailored ion channels that range from de novo designed synthetic molecules to genetically engineered or simply exogenously expressed or reconstituted wild-type channels. Next we consider aspects of experimental design by comparing various membrane environments or systems that make it possible to quantify the response of ion channels to biochemical processes of interest. We present applications of ion channels to answer questions in chemical biology, and propose potential future developments and applications of these single molecule probes. Finally we discuss the hurdles that impede the routine use of ion channel probes in biochemistry and cell biology laboratories and developments and strategies that could overcome these problems. Optogenetics has facilitated breakthroughs in neuroscience, and these results give a dramatic idea of what may lie ahead for designed ion channels as a functional class of molecular probes. If researchers can improve molecular engineering to increase ion channel versatility and can overcome the barriers to collaborating across disciplines, we conclude that these structures could have tremendous potential as novel tools for chemical biology studies.
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Affiliation(s)
- Michael Mayer
- Department of Chemical Engineering and Department of Biomedical Engineering, University of Michigan, 1101 Beal Avenue, Ann Arbor, Michigan 48109-2110, United States
| | - Jerry Yang
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093-0358, United States
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33
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Itoh H, Inoue M. Chemical construction and structural permutation of potent cytotoxin polytheonamide B: discovery of artificial peptides with distinct functions. Acc Chem Res 2013; 46:1567-78. [PMID: 23488446 DOI: 10.1021/ar300315p] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Polytheonamide B (1), isolated from the marine sponge Theonella swinhoei, is a posttranslationally modified ribosomal peptide (MW 5030 Da) that displays extraordinary cytotoxicity. Among its 48 amino acid residues, this peptide includes a variety D- and L-amino acids that do not occur in proteins, and the chiralities of these amino acids alternate in sequence. These structural features induce the formation of a stable β6.3-helix, giving rise to a tubular structure of over 4 nm in length. In the biological setting, this fold is believed to transport cations across the lipid bilayer through a pore, thereby acting as an ion channel. In this Account, we discuss the construction and structural permutations of this potent cytotoxin. First we describe the 161-step chemical construction of this unusual peptide 1. By developing a synthetic route to 1, we established the chemical basis for subsequent SAR studies to pinpoint the proteinogenic and nonproteinogenic building blocks within the molecule that confer its toxicity and channel function. Using fully synthetic 1, we generated seven analogues with point mutations, and studies of their activity revealed the importance of the N-terminal moiety. Next, we simplified the structure of 1 by substituting six amino acid residues of 1 to design a more synthetically accessible analogue 9. This dansylated polytheonamide mimic 9 was synthesized in 127 total steps, and we evaluated its function to show that it can emulate the toxic and ion channel activities of 1 despite its multiple structural modifications. Finally, we applied a highly automated synthetic route to 48-mer 9 to generate 13 substructures of 27-39-mers. The 37-mer 12 exhibited nanomolar level toxicity through a potentially distinct mode of action from 1 and 9. The SAR studies of polytheonamide B and the 21 artificial analogues have deepened our understanding of the precise structural requirements for the biological functions of 1. They have also led to the discovery of artificial molecules with various toxicities and channel functions. These achievements demonstrate the benefits of total synthesis and the importance of efficient construction of complex molecules. The knowledge accumulated through these studies will be useful for the rational design of new tailor-made channel peptides and cytotoxic molecules with desired functions.
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Affiliation(s)
- Hiroaki Itoh
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Masayuki Inoue
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Itoh H, Matsuoka S, Kreir M, Inoue M. Design, Synthesis and Functional Analysis of Dansylated Polytheonamide Mimic: An Artificial Peptide Ion Channel. J Am Chem Soc 2012; 134:14011-8. [DOI: 10.1021/ja303831a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Hiroaki Itoh
- Graduate School of Pharmaceutical
Sciences, The University of Tokyo, Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shigeru Matsuoka
- Graduate School of Pharmaceutical
Sciences, The University of Tokyo, Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
| | - Mohamed Kreir
- Nanion Technologies GmbH, Gabrielenstrasse 9, D-80636 Munich, Germany
| | - Masayuki Inoue
- Graduate School of Pharmaceutical
Sciences, The University of Tokyo, Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
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Bessonov A, Takemoto JY, Simmel FC. Probing DNA-lipid membrane interactions with a lipopeptide nanopore. ACS NANO 2012; 6:3356-3363. [PMID: 22424398 DOI: 10.1021/nn3003696] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Association of DNA molecules with lipid bilayer membranes is of considerable interest for a large variety of applications in biotechnology. Here we introduce syringomycin E (SRE), a small pore-forming lipopeptide produced by the bacterium Pseudomonas syringae, as a facile sensor for the detection of DNA interactions with lipid membranes. SRE forms highly reproducible pores in cellular and artificial membranes. The pore structure involves bilayer lipids, which have a pronounced influence on open channel conductance and gating. SRE channels act as ionic diodes that serve as current rectifiers sensitive to the charge of the bilayer. We employ this intrinsic property to electronically monitor the association of DNA molecules with the membrane in a variety of different settings. We show that SRE can be used for quantitatively probing electrostatic interactions of DNA and DNA-cholesterol conjugates with a lipid membrane. Furthermore, we demonstrate that SRE channels allow monitoring of hybridization reactions between lipid-anchored probe strands and complementary strands in solution. In the presence of double-stranded DNA, SRE channels display a particularly high degree of rectification. Finally, the formation of multilayered structures assembled from poly-(L)-lysine and DNA oligonucleotides on the membrane was precisely monitored with SRE.
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Affiliation(s)
- Andrey Bessonov
- Physics Department E14 and ZNN/WSI, Technische Universität München, Am Coulombwall 4a, 85748, Garching, Germany.
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Shinohara N, Itoh H, Matsuoka S, Inoue M. Selective modification of the N-terminal structure of polytheonamide B significantly changes its cytotoxicity and activity as an ion channel. ChemMedChem 2012; 7:1770-3. [PMID: 22489077 DOI: 10.1002/cmdc.201200142] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2012] [Indexed: 11/06/2022]
Abstract
Chemical point mutation: Polytheonamide B is a naturally occurring polypeptide containing 48 amino acids. It both displays potent cytotoxicity and acts as a monovalent cation channel in vitro. Chemoselective methods to modify the 44th, N-, and C-terminal residues of the natural product have been developed, and evaluation of the resultant derivatives suggests that the intrinsic activities of the peptide can only be altered by switching its N-terminal substitution.
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Affiliation(s)
- Naoki Shinohara
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Tokyo 113-0033, Japan
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Chui JKW, Fyles TM. Ionic conductance of synthetic channels: analysis, lessons, and recommendations. Chem Soc Rev 2012; 41:148-75. [DOI: 10.1039/c1cs15099e] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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38
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Wang F, Qin L, Pace CJ, Wong P, Malonis R, Gao J. Solubilized Gramicidin A as Potential Systemic Antibiotics. Chembiochem 2011; 13:51-5. [DOI: 10.1002/cbic.201100671] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2011] [Indexed: 11/07/2022]
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39
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Field-effect reconfigurable nanofluidic ionic diodes. Nat Commun 2011; 2:506. [DOI: 10.1038/ncomms1514] [Citation(s) in RCA: 184] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Accepted: 09/21/2011] [Indexed: 11/08/2022] Open
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40
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Guo Z, Wang J, Ren J, Wang E. pH-reversed ionic current rectification displayed by conically shaped nanochannel without any modification. NANOSCALE 2011; 3:3767-3773. [PMID: 21826328 DOI: 10.1039/c1nr10434a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Ion current through a nascent nanochannel with conically shaped geometry in PET (polyethylene terephthalate) membrane sandwiched between two same buffer solutions at pH ≤ 3 was routinely considered to exhibit no rectification and, if any, much weaker rectification than that for a nanochannel with a negative surface charge, since the surface charge on the membrane decreases to zero along with decreasing the pH value of the buffer solution down to the pK(a) of carboxylic acid. However, in this study, we discovered that in the buffer solution with low ionic strength at pH values below 3, the conically shaped nanochannels exhibited distinct ion current rectification, as expected for nanochannels with a positive surface charge, if voltages beyond ±2V range were scanned. We reasoned that the current rectification engendered by the positive surface charge of a conical nanochannel was due to further protonation of the hydrogen bonded hydrogel layer or neutral carboxylic acid inside the nanochannel. Therefore, our results enrich the knowledge about nanochannel technology and indicate that a nanofluidic diode based on pH-reversed ion current rectification through a conical nanochannel can be achieved without any modification of the PET membrane.
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Affiliation(s)
- Zhijun Guo
- State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Graduate School of the Chinese Academy of Sciences, Changchun 130022, Jilin, PR China
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Prangkio P, Rao DK, Lance KD, Rubinshtein M, Yang J, Mayer M. Self-assembled, cation-selective ion channels from an oligo(ethylene glycol) derivative of benzothiazole aniline. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2011; 1808:2877-85. [PMID: 21889925 DOI: 10.1016/j.bbamem.2011.08.024] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2011] [Revised: 07/22/2011] [Accepted: 08/18/2011] [Indexed: 01/01/2023]
Abstract
This paper describes the spontaneous formation of well-defined pores in planar lipid bilayers from the self-assembly of a small synthetic molecule that contains a benzothiazole aniline (BTA) group attached to a tetra-ethylene glycol (EG4) moiety. Macroscopic and single-channel current recordings suggest that these pores are formed by the assembly of four BTA-EG4 monomers with an open pore diameter that appears similar to the one of gramicidin pores (~0.4 nm). The single-channel conductance of these pores is modulated by the pH of the electrolyte and has a minimum at pH~3. Self-assembled pores from BTA-EG4 are selective for monovalent cations and have long open channel lifetimes on the order of seconds. BTA-EG4 monomers in these pores appear to be arranged symmetrically across both leaflets of the bilayer, and spectroscopy studies suggest that the fluorescent BTA group is localized inside the lipid bilayers. In terms of biological activity, BTA-EG4 molecules inhibited growth of gram-positive Bacillus subtilis bacteria (IC50~50 μM) and human neuroblastoma SH-SY5Y cells (IC50~60 μM), while they were not toxic to gram-negative Escherichia coli bacteria at a concentration up to 500 μM. Based on these properties, this drug-like, synthetic, pore-forming molecule with a molecular weight below 500 g mol(-1) might be appealing as a starting material for development of antibiotics or membrane-permeating moieties for drug delivery. From a biophysical point of view, long-lived, well-defined ion-selective pores from BTA-EG4 molecules offer an example of a self-assembled synthetic supramolecule with biological function.
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Affiliation(s)
- Panchika Prangkio
- Department of Biomedical Engineering, University of Michigan, 1101 Beal Avenue, Ann Arbor, Michigan 48109-2110, USA
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Macrae MX, Schlamadinger D, Kim JE, Mayer M, Yang J. Using charge to control the functional properties of self-assembled nanopores in membranes. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2011; 7:2016-2020. [PMID: 21626687 DOI: 10.1002/smll.201100394] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Indexed: 05/30/2023]
Affiliation(s)
- Michael X Macrae
- University of California-San Diego, Department of Chemistry and Biochemistry, La Jolla, CA 92093-0358, USA
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Zhou K, Perry JM, Jacobson SC. Transport and sensing in nanofluidic devices. ANNUAL REVIEW OF ANALYTICAL CHEMISTRY (PALO ALTO, CALIF.) 2011; 4:321-41. [PMID: 21456970 DOI: 10.1146/annurev-anchem-061010-113938] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Ion transport and sensing in nanofluidic devices are receiving a great deal of attention because of their unique transport properties and potential analytical applications. Some aspects of microscale transport transfer directly to the nanoscale, but nanofluidic systems can be significantly influenced by phenomena such as double-layer overlap, surface charge, ion-current rectification, diffusion, and entropic forces, which are either insignificant or absent in larger microchannels. Micro- and nanofabrication techniques create features with a wide range of well-defined geometries and dimensions in synthetic and solid-state substrates. Moreover, these techniques permit coupling of multiple nano- and microscale elements, which can execute various functions. We discuss basic nanofluidic architectures, material transport properties through single and multiple nanochannels, and characterization of single particles by resistive-pulse sensing.
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Affiliation(s)
- Kaimeng Zhou
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, USA
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Majd S, Yusko EC, Billeh YN, Macrae MX, Yang J, Mayer M. Applications of biological pores in nanomedicine, sensing, and nanoelectronics. Curr Opin Biotechnol 2010; 21:439-76. [PMID: 20561776 PMCID: PMC3121537 DOI: 10.1016/j.copbio.2010.05.002] [Citation(s) in RCA: 264] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2010] [Revised: 05/03/2010] [Accepted: 05/06/2010] [Indexed: 12/29/2022]
Abstract
Biological protein pores and pore-forming peptides can generate a pathway for the flux of ions and other charged or polar molecules across cellular membranes. In nature, these nanopores have diverse and essential functions that range from maintaining cell homeostasis and participating in cell signaling to activating or killing cells. The combination of the nanoscale dimensions and sophisticated - often regulated - functionality of these biological pores make them particularly attractive for the growing field of nanobiotechnology. Applications range from single-molecule sensing to drug delivery and targeted killing of malignant cells. Potential future applications may include the use of nanopores for single strand DNA sequencing and for generating bio-inspired, and possibly, biocompatible visual detection systems and batteries. This article reviews the current state of applications of pore-forming peptides and proteins in nanomedicine, sensing, and nanoelectronics.
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Affiliation(s)
- Sheereen Majd
- Department of Biomedical Engineering, University of Michigan, 1101 Beal Avenue, Ann Arbor, Michigan 48109-2110, USA
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Szymczyk A, Zhu H, Balannec B. Ion Rejection Properties of Nanopores with Bipolar Fixed Charge Distributions. J Phys Chem B 2010; 114:10143-50. [DOI: 10.1021/jp1025575] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anthony Szymczyk
- Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France, and Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1 - ENSCR, 263 Avenue du Général Leclerc, Bâtiment 10 A, CS 74205, 35042 Rennes Cedex, France
| | - Haochen Zhu
- Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France, and Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1 - ENSCR, 263 Avenue du Général Leclerc, Bâtiment 10 A, CS 74205, 35042 Rennes Cedex, France
| | - Béatrice Balannec
- Université Européenne de Bretagne, 5 Boulevard Laënnec, 35000 Rennes, France, and Sciences Chimiques de Rennes, UMR 6226 CNRS - Université de Rennes 1 - ENSCR, 263 Avenue du Général Leclerc, Bâtiment 10 A, CS 74205, 35042 Rennes Cedex, France
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