1
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Gonzalez BD, Forbrig E, Yao G, Kielb P, Mroginski MA, Hildebrandt P, Kozuch J. Cation Dependence of Enniatin B/Membrane-Interactions Assessed Using Surface-Enhanced Infrared Absorption (SEIRA) Spectroscopy. Chempluschem 2024:e202400159. [PMID: 38700478 DOI: 10.1002/cplu.202400159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2024] [Revised: 04/26/2024] [Accepted: 04/29/2024] [Indexed: 05/05/2024]
Abstract
Enniatins are mycotoxins with well-known antibacterial, antifungal, antihelmintic and antiviral activity, which have recently come to attention as potential mitochondriotoxic anticancer agents. The cytotoxicity of enniatins is traced back to ionophoric properties, in which the cyclodepsipeptidic structure results in enniatin:cation-complexes of various stoichiometries proposed as membrane-active species. In this work, we employed a combination of surface-enhanced infrared absorption (SEIRA) spectroscopy, tethered bilayer lipid membranes (tBLMs) and density functional theory (DFT)-based computational spectroscopy to monitor the cation-dependence (Mz+=Na+, K+, Cs+, Li+, Mg2+, Ca2+) on the mechanism of enniatin B (EB) incorporation into membranes and identify the functionally relevant EBn : Mz+ complexes formed. We find that Na+ promotes a cooperative incorporation, modelled via an autocatalytic mechanism and mediated by a distorted 2 : 1-EB2 : Na+ complex. K+ (and Cs+) leads to a direct but less efficient insertion into membranes due to the adoption of "ideal" EB2 : K+ sandwich complexes. In contrast, the presence of Li+, Mg2+, and Ca2+ causes a (partial) extraction of EB from the membrane via the formation of "belted" 1 : 1-EB : Mz+ complexes, which screen the cationic charge less efficiently. Our results point to a relevance of the cation dependence for the transport into the malignant cells where the mitochondriotoxic anticancer activity is exerted.
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Affiliation(s)
- Barbara Daiana Gonzalez
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Enrico Forbrig
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Guiyang Yao
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 124, D-10623, Berlin, Germany
| | - Patrycja Kielb
- Clausius Institut für Physikalische und Theoretische Chemie, Universität Bonn, Wegelerstr. 12, D-53115, Bonn, Germany
- Transdisciplinary Research Area', Building Blocks of Matter and Fundamental Interactions (TRA Matter), Universität Bonn, D-53115, Bonn, Germany
| | - Maria Andrea Mroginski
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Peter Hildebrandt
- Institut für Chemie, Technische Universität Berlin, Sekr. PC14, Straße des 17. Juni 135, D-10623, Berlin, Germany
| | - Jacek Kozuch
- Fachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195, Berlin, Germany
- Forschungsbau SupraFAB, Freie Universität Berlin, Altensteinstr. 23a, D-14195, Berlin, Germany
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2
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Socrier L, Steinem C. Pore-spanning membranes as a tool to investigate lateral lipid membrane heterogeneity. Methods Enzymol 2024; 700:455-483. [PMID: 38971610 DOI: 10.1016/bs.mie.2024.02.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/08/2024]
Abstract
Over the years, it has become more and more obvious that lipid membranes show a very complex behavior. This behavior arises in part from the large number of different kinds of lipids and proteins and how they dynamically interact with each other. In vitro studies using artificial membrane systems have shed light on the heterogeneity based on lipid-lipid interactions in multicomponent bilayer mixtures. Inspired by the raft hypothesis, the coexistence of liquid-disordered (ld) and liquid-ordered (lo) phases has drawn much attention. It was shown that ternary lipid mixtures containing low- and high-melting temperature lipids and cholesterol can phase separate into a lo phase enriched in the high-melting lipids and cholesterol and a ld phase enriched in the low-melting lipids. Depending on the model membrane system under investigation, different domain sizes, shapes, and mobilities have been found. Here, we describe how to generate phase-separated lo/ld phases in model membrane systems termed pore-spanning membranes (PSMs). These PSMs are prepared on porous silicon substrates with pore sizes in the micrometer regime. A proper functionalization of the top surface of the substrates is required to achieve the spreading of giant unilamellar vesicles (GUVs) to obtain PSMs. Starting with lo/ld phase-separated GUVs lead to membrane heterogeneities in the PSMs. Depending on the functionalization strategy of the top surface of the silicon substrate, different membrane heterogeneities are observed in the PSMs employing fluorescence microscopy. A quantitative analysis of the heterogeneity as well as the dynamics of the lipid domains is described.
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Affiliation(s)
- Larissa Socrier
- Max-Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany
| | - Claudia Steinem
- Max-Planck-Institute for Dynamics and Self-Organization, Göttingen, Germany; Institute of Organic and Biomolecular Chemistry, Georg-August Universität, Göttingen, Germany.
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3
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Berselli G, Gimenez A, O’Connor A, Keyes TE. Robust Photoelectric Biomolecular Switch at a Microcavity-Supported Lipid Bilayer. ACS APPLIED MATERIALS & INTERFACES 2021; 13:29158-29169. [PMID: 34121400 PMCID: PMC8289237 DOI: 10.1021/acsami.1c06798] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Accepted: 06/01/2021] [Indexed: 05/08/2023]
Abstract
Biomolecular devices based on photo-responsive proteins have been widely proposed for medical, electrical, and energy storage and production applications. Also, bacteriorhodopsin (bR) has been extensively applied in such prospective devices as a robust photo addressable proton pump. As it is a membrane protein, in principle, it should function most efficiently when reconstituted into a fully fluid lipid bilayer, but in many model membranes, lateral fluidity of the membrane and protein is sacrificed for electrochemical addressability because of the need for an electroactive surface. Here, we reported a biomolecular photoactive device based on light-activated proton pump, bR, reconstituted into highly fluidic microcavity-supported lipid bilayers (MSLBs) on functionalized gold and polydimethylsiloxane cavity array substrates. The integrity of reconstituted bR at the MSLBs along with the lipid bilayer formation was evaluated by fluorescence lifetime correlation spectroscopy, yielding a protein lateral diffusion coefficient that was dependent on the bR concentration and consistent with the Saffman-Delbrück model. The photoelectrical properties of bR-MSLBs were evaluated from the photocurrent signal generated by bR under continuous and transient light illumination. The optimal conditions for a self-sustaining photoelectrical switch were determined in terms of protein concentration, pH, and light switch frequency of activation. Overall, a significant increase in the transient current was observed for lipid bilayers containing approximately 0.3 mol % bR with a measured photo-current of 250 nA/cm2. These results demonstrate that the platforms provide an appropriate lipid environment to support the proton pump, enabling its efficient operation. The bR-reconstituted MSLB model serves both as a platform to study the protein in a highly addressable biomimetic environment and as a demonstration of reconstitution of seven-helix receptors into MSLBs, opening the prospect of reconstitution of related membrane proteins including G-protein-coupled receptors on these versatile biomimetic substrates.
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Affiliation(s)
- Guilherme
B. Berselli
- School of Chemical Sciences, National
Centre for Sensor Research, Dublin City
University, Dublin D09 FW22, Ireland
| | - Aurélien
V. Gimenez
- School of Chemical Sciences, National
Centre for Sensor Research, Dublin City
University, Dublin D09 FW22, Ireland
| | - Alexandra O’Connor
- School of Chemical Sciences, National
Centre for Sensor Research, Dublin City
University, Dublin D09 FW22, Ireland
| | - Tia E. Keyes
- School of Chemical Sciences, National
Centre for Sensor Research, Dublin City
University, Dublin D09 FW22, Ireland
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4
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Mech-Dorosz A, Bajraktari N, Hélix-Nielsen C, Emnéus J, Heiskanen A. Stationary photocurrent generation from bacteriorhodopsin-loaded lipo-polymersomes in polyelectrolyte multilayer assembly on polyethersulfone membrane. Anal Bioanal Chem 2020; 412:6307-6318. [PMID: 32166446 DOI: 10.1007/s00216-020-02533-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2019] [Revised: 02/12/2020] [Accepted: 02/17/2020] [Indexed: 11/24/2022]
Abstract
Vesicles constructed of either synthetic polymers alone (polymersomes) or a combination of polymers and lipids (lipo-polymersomes) demonstrate excellent long-term stability and ability to integrate membrane proteins. Applications using lipo-polymersomes with integrated membrane proteins require suitable supports to maintain protein functionality. Using lipo-polymersomes loaded with the light-driven proton pump bacteriorhodopsin (BR), we demonstrate here how the photocurrent is influenced by a chosen support. In our study, we deposited BR-loaded lipo-polymersomes in a cross-linked polyelectrolyte multilayer assembly either directly physisorbed on gold electrode microchips or cross-linked on an intermediary polyethersulfone (PES) membrane covalently grafted using a hydrogel cushion. In both cases, electrochemical impedance spectroscopic characterization demonstrated successful polyelectrolyte assembly with BR-loaded lipo-polymersomes. Light-induced proton pumping by BR-loaded lipo-polymersomes in the different support constructs was characterized by amperometric recording of the generated photocurrent. Application of the hydrogel/PES membrane support together with the polyelectrolyte assembly decreased the transient current response upon light activation of BR, while enhancing the generated stationary current to over 700 nA/cm2. On the other hand, the current response from BR-loaded lipo-polymersomes in a polyelectrolyte assembly without the hydrogel/PES membrane support was primarily a transient peak combined with a low-nanoampere-level stationary photocurrent. Hence, the obtained results demonstrated that by using a hydrogel/PES support it was feasible to monitor continuously light-induced proton flux in biomimetic applications of lipo-polymersomes. Graphical abstract.
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Affiliation(s)
- Agnieszka Mech-Dorosz
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Produktionstorvet, Building 423, 2800, Kgs. Lyngby, Denmark
- Novo Nordisk A/S, Brennum Park 24 K, 3400, Hillerød, Denmark
| | - Niada Bajraktari
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, 2800, Kgs. Lyngby, Denmark
- Aquaporin A/S, Nymøllevej 78, 2800, Kgs. Lyngby, Denmark
| | - Claus Hélix-Nielsen
- Department of Environmental Engineering, Technical University of Denmark, Bygningstorvet, Building 115, 2800, Kgs. Lyngby, Denmark
- Aquaporin A/S, Nymøllevej 78, 2800, Kgs. Lyngby, Denmark
| | - Jenny Emnéus
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Produktionstorvet, Building 423, 2800, Kgs. Lyngby, Denmark
| | - Arto Heiskanen
- Department of Biotechnology and Biomedicine, Technical University of Denmark, Produktionstorvet, Building 423, 2800, Kgs. Lyngby, Denmark.
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5
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Sun Y, Zang X, Sun Y, Wang L, Gao Z. Lipid membranes supported by planar porous substrates. Chem Phys Lipids 2020; 228:104893. [PMID: 32097619 DOI: 10.1016/j.chemphyslip.2020.104893] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Accepted: 02/10/2020] [Indexed: 12/18/2022]
Abstract
Biological membranes play key roles in cell life, but their intrinsic complexity motivated the study and development of artificial lipid membranes with the primary aim to reconstitute and understand the natural functions in vitro. Porous-supported lipid membrane (pSLM) has emerged as a flexible platform for studying the surface chemistry of the cell due to their high stability and fluidity, and their ability to study the transmembrane process of the molecules. In this review, the pSLM, for the first time, to our knowledge, was divided into three types according to the way of the porous materials support the lipid membrane, containing the lipid membrane on the pores of the porous materials, the lipid membrane on both sides of the porous materials, the lipid membrane in the pores of the porous materials. All of these pSLMs were systematically elaborated from several aspects, including the substrates, formation, and characterization. Meanwhile, the advantages and disadvantages of each model membranes were summarized. Finally, suggestions for selecting appropriate pSLM and future directions in this area are discussed.
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Affiliation(s)
- Yanping Sun
- Department of Pharmacy, Hebei University of Science and Technology, Shijiazhuang, 050018, China; State Key Laboratory Breeding Base - Hebei Province Key Laboratory of Molecular Chemistry for Drugs, Hebei University of Science and Technology, Shijiazhuang, 050018, China; Hebei Research Center of Pharmaceutical and Chemical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Xianghuan Zang
- Department of Pharmacy, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Yongjun Sun
- Department of Pharmacy, Hebei University of Science and Technology, Shijiazhuang, 050018, China; Hebei Research Center of Pharmaceutical and Chemical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China
| | - Long Wang
- State Key Laboratory Breeding Base - Hebei Province Key Laboratory of Molecular Chemistry for Drugs, Hebei University of Science and Technology, Shijiazhuang, 050018, China; Department of Family and Consumer Sciences, California State University, Long Beach, CA, 90840, USA.
| | - Zibin Gao
- Department of Pharmacy, Hebei University of Science and Technology, Shijiazhuang, 050018, China; State Key Laboratory Breeding Base - Hebei Province Key Laboratory of Molecular Chemistry for Drugs, Hebei University of Science and Technology, Shijiazhuang, 050018, China; Hebei Research Center of Pharmaceutical and Chemical Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, China.
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6
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Miyashita W, Saeki D, Matsuyama H. Formation of supported lipid bilayers on porous polymeric substrates induced by hydrophobic interaction. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Ronen R, Kaufman Y, Freger V. Formation of pore-spanning lipid membrane and cross-membrane water and ion transport. J Memb Sci 2017. [DOI: 10.1016/j.memsci.2016.09.059] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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8
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Garni M, Thamboo S, Schoenenberger CA, Palivan CG. Biopores/membrane proteins in synthetic polymer membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1859:619-638. [PMID: 27984019 DOI: 10.1016/j.bbamem.2016.10.015] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2016] [Revised: 10/20/2016] [Accepted: 10/25/2016] [Indexed: 12/14/2022]
Abstract
BACKGROUND Mimicking cell membranes by simple models based on the reconstitution of membrane proteins in lipid bilayers represents a straightforward approach to understand biological function of these proteins. This biomimetic strategy has been extended to synthetic membranes that have advantages in terms of chemical and mechanical stability, thus providing more robust hybrid membranes. SCOPE OF THE REVIEW We present here how membrane proteins and biopores have been inserted both in the membrane of nanosized and microsized compartments, and in planar membranes under various conditions. Such bio-hybrid membranes have new properties (as for example, permeability to ions/molecules), and functionality depending on the specificity of the inserted biomolecules. Interestingly, membrane proteins can be functionally inserted in synthetic membranes provided these have appropriate properties to overcome the high hydrophobic mismatch between the size of the biomolecule and the membrane thickness. MAJOR CONCLUSION Functional insertion of membrane proteins and biopores in synthetic membranes of compartments or in planar membranes is possible by an appropriate selection of the amphiphilic copolymers, and conditions of the self-assembly process. These hybrid membranes have new properties and functionality based on the specificity of the biomolecules and the nature of the synthetic membranes. GENERAL SIGNIFICANCE Bio-hybrid membranes represent new solutions for the development of nanoreactors, artificial organelles or active surfaces/membranes that, by further gaining in complexity and functionality, will promote translational applications. This article is part of a Special Issue entitled: Lipid order/lipid defects and lipid-control of protein activity edited by Dirk Schneider.
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Affiliation(s)
- Martina Garni
- Chemistry Department, University of Basel, Klingelbergstrasse 80, Switzerland
| | - Sagana Thamboo
- Chemistry Department, University of Basel, Klingelbergstrasse 80, Switzerland
| | | | - Cornelia G Palivan
- Chemistry Department, University of Basel, Klingelbergstrasse 80, Switzerland.
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9
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Wiebalck S, Kozuch J, Forbrig E, Tzschucke CC, Jeuken LJC, Hildebrandt P. Monitoring the Transmembrane Proton Gradient Generated by Cytochrome bo3 in Tethered Bilayer Lipid Membranes Using SEIRA Spectroscopy. J Phys Chem B 2016; 120:2249-56. [DOI: 10.1021/acs.jpcb.6b01435] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Swantje Wiebalck
- Institut
für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
| | - Jacek Kozuch
- Institut
für Chemie, Technische Universität Berlin, Straße des
17. Juni 135, D-10623 Berlin, Germany
| | - Enrico Forbrig
- Institut
für Chemie, Technische Universität Berlin, Straße des
17. Juni 135, D-10623 Berlin, Germany
| | - C. Christoph Tzschucke
- Institut
für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, D-14195 Berlin, Germany
| | - Lars J. C. Jeuken
- School of Biomedical Sciences, the Astbury Centre for Structural Molecular Biology, and School of Physics & Astronomy, University of Leeds, Leeds LS2 9JT, United Kingdom
| | - Peter Hildebrandt
- Institut
für Chemie, Technische Universität Berlin, Straße des
17. Juni 135, D-10623 Berlin, Germany
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10
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Gupta G, Staggs K, Mohite AD, Baldwin JK, Iyer S, Mukundan R, Misra A, Antoniou A, Dattelbaum AM. Fluid and Resistive Tethered Lipid Membranes on Nanoporous Substrates. J Phys Chem B 2015; 119:12868-76. [DOI: 10.1021/acs.jpcb.5b04482] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Antonia Antoniou
- School
of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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11
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Janshoff A, Steinem C. Mechanics of lipid bilayers: What do we learn from pore-spanning membranes? BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2015; 1853:2977-83. [PMID: 26025679 DOI: 10.1016/j.bbamcr.2015.05.029] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Revised: 05/21/2015] [Accepted: 05/22/2015] [Indexed: 11/18/2022]
Abstract
The mechanical properties of biological membranes have become increasingly important not only from a biophysical viewpoint but also as they play a substantial role in the information transfer in cells and tissues. This minireview summarizes some of our recent understanding of the mechanical properties of artificial model membranes with particular emphasis on membranes suspending an array of pores, so called pore-spanning membranes. A theoretical description of the mechanical properties of these membranes might pave the way to biophysically describe and understand the complex behavior of native biological membranes. This article is part of a Special Issue entitled: Mechanobiology.
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Affiliation(s)
- Andreas Janshoff
- Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstr. 2, 37077 Göttingen, Germany; Institute of Physical Chemistry, University of Göttingen, Tammannstr. 6, 37077 Göttingen, Germany
| | - Claudia Steinem
- Institute of Organic and Biomolecular Chemistry, University of Göttingen, Tammannstr. 2, 37077 Göttingen, Germany; Institute of Physical Chemistry, University of Göttingen, Tammannstr. 6, 37077 Göttingen, Germany.
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12
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Angle MR, Cui B, Melosh NA. Nanotechnology and neurophysiology. Curr Opin Neurobiol 2015; 32:132-40. [PMID: 25889532 DOI: 10.1016/j.conb.2015.03.014] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 02/11/2015] [Accepted: 03/23/2015] [Indexed: 02/09/2023]
Abstract
Neuroscience would be revolutionized by a technique to measure intracellular electrical potentials that would not disrupt cellular physiology and could be massively parallelized. Though such a technology does not yet exist, the technical hurdles for fabricating minimally disruptive, solid-state electrical probes have arguably been overcome in the field of nanotechnology. Nanoscale devices can be patterned with features on the same length scale as biological components, and several groups have demonstrated that nanoscale electrical probes can measure the transmembrane potential of electrogenic cells. Developing these nascent technologies into robust intracellular recording tools will now require a better understanding of device-cell interactions, especially the membrane-inorganic interface. Here we review the state-of-the art in nanobioelectronics, emphasizing the characterization and design of stable interfaces between nanoscale devices and cells.
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Affiliation(s)
- Matthew R Angle
- Department of Materials Science and Engineering, Stanford University, CA, USA
| | - Bianxiao Cui
- Department of Chemistry, Stanford University, CA, USA
| | - Nicholas A Melosh
- Department of Materials Science and Engineering, Stanford University, CA, USA; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, CA, USA.
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13
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Basit H, Gaul V, Maher S, Forster RJ, Keyes TE. Aqueous-filled polymer microcavity arrays: versatile & stable lipid bilayer platforms offering high lateral mobility to incorporated membrane proteins. Analyst 2015; 140:3012-8. [DOI: 10.1039/c4an02317j] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
A robust new supported cell membrane model is described comprising lipid bilayers supported on aqueous filled spherical cap pores in PDMS, both lipid and reconstituted membrane proteins diffuse unhindered by the underlying support.
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Affiliation(s)
- Hajra Basit
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
| | - Vinnie Gaul
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
| | - Sean Maher
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
| | - Robert J. Forster
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
| | - Tia E. Keyes
- School of Chemical Sciences
- National Centre for Sensor Research
- Dublin City University
- Dublin 9
- Ireland
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14
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Kumeria T, Santos A, Losic D. Nanoporous anodic alumina platforms: engineered surface chemistry and structure for optical sensing applications. SENSORS (BASEL, SWITZERLAND) 2014; 14:11878-918. [PMID: 25004150 PMCID: PMC4168464 DOI: 10.3390/s140711878] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Revised: 06/23/2014] [Accepted: 06/25/2014] [Indexed: 12/27/2022]
Abstract
Electrochemical anodization of pure aluminum enables the growth of highly ordered nanoporous anodic alumina (NAA) structures. This has made NAA one of the most popular nanomaterials with applications including molecular separation, catalysis, photonics, optoelectronics, sensing, drug delivery, and template synthesis. Over the past decades, the ability to engineer the structure and surface chemistry of NAA and its optical properties has led to the establishment of distinctive photonic structures that can be explored for developing low-cost, portable, rapid-response and highly sensitive sensing devices in combination with surface plasmon resonance (SPR) and reflective interference spectroscopy (RIfS) techniques. This review article highlights the recent advances on fabrication, surface modification and structural engineering of NAA and its application and performance as a platform for SPR- and RIfS-based sensing and biosensing devices.
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Affiliation(s)
- Tushar Kumeria
- School of Chemical Engineering, Engineering North Building, The University of Adelaide, North Terrace Campus, Adelaide SA 5005, Australia.
| | - Abel Santos
- School of Chemical Engineering, Engineering North Building, The University of Adelaide, North Terrace Campus, Adelaide SA 5005, Australia.
| | - Dusan Losic
- School of Chemical Engineering, Engineering North Building, The University of Adelaide, North Terrace Campus, Adelaide SA 5005, Australia.
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15
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Lee W, Park SJ. Porous Anodic Aluminum Oxide: Anodization and Templated Synthesis of Functional Nanostructures. Chem Rev 2014; 114:7487-556. [DOI: 10.1021/cr500002z] [Citation(s) in RCA: 905] [Impact Index Per Article: 90.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Woo Lee
- Korea Research Institute of Standards and Science (KRISS), Yuseong, 305-340 Daejeon, Korea
- Department
of Nano Science, University of Science and Technology (UST), Yuseong, 305-333 Daejeon, Korea
| | - Sang-Joon Park
- Korea Research Institute of Standards and Science (KRISS), Yuseong, 305-340 Daejeon, Korea
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16
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de Groot GW, Demarche S, Santonicola MG, Tiefenauer L, Vancso GJ. Smart polymer brush nanostructures guide the self-assembly of pore-spanning lipid bilayers with integrated membrane proteins. NANOSCALE 2014; 6:2228-37. [PMID: 24425208 DOI: 10.1039/c3nr05356c] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Nanopores in arrays on silicon chips are functionalized with pH-responsive poly(methacrylic acid) (PMAA) brushes and used as supports for pore-spanning lipid bilayers with integrated membrane proteins. Robust platforms are created by the covalent grafting of polymer brushes using surface-initiated atom transfer radical polymerization (ATRP), resulting in sensor chips that can be successfully reused over several assays. His-tagged proteins are selectively and reversibly bound to the nitrilotriacetic acid (NTA) functionalization of the PMAA brush, and consequently lipid bilayer membranes are formed. The enhanced membrane resistance as determined by electrochemical impedance spectroscopy and free diffusion of dyed lipids observed as fluorescence recovery after photobleaching confirmed the presence of lipid bilayers. Immobilization of the His-tagged membrane proteins on the NTA-modified PMAA brush near the pore edges is characterized by fluorescence microscopy. This system allows us to adjust the protein density in free-standing bilayers, which are stabilized by the polymer brush underneath. The potential application of the integrated platform for ion channel protein assays is demonstrated.
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Affiliation(s)
- G Wilhelmina de Groot
- Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, 7500 AE Enschede, The Netherlands.
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Kozuch J, Weichbrodt C, Millo D, Giller K, Becker S, Hildebrandt P, Steinem C. Voltage-dependent structural changes of the membrane-bound anion channel hVDAC1 probed by SEIRA and electrochemical impedance spectroscopy. Phys Chem Chem Phys 2014; 16:9546-55. [DOI: 10.1039/c4cp00167b] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
SEIRA spectroscopy provides insight into the potential-induced structural changes of the anion channel hVDAC1 embedded in the tethered bilayer lipid membrane.
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Affiliation(s)
- Jacek Kozuch
- Technische Universität Berlin
- Institut für Chemie
- D-10623 Berlin, Germany
| | - Conrad Weichbrodt
- Georg-August-Universität Göttingen
- Institut für Organische und Biomolekulare Chemie
- 37077 Göttingen, Germany
| | - Diego Millo
- Vrije Universiteit Amsterdam
- Biomolecular Spectroscopy/LaserLaB Amsterdam
- 1081 HV Amsterdam, The Netherlands
| | - Karin Giller
- Max-Planck Institut für Biophysikalische Chemie
- D-37077 Göttingen, Germany
| | - Stefan Becker
- Max-Planck Institut für Biophysikalische Chemie
- D-37077 Göttingen, Germany
| | - Peter Hildebrandt
- Technische Universität Berlin
- Institut für Chemie
- D-10623 Berlin, Germany
| | - Claudia Steinem
- Georg-August-Universität Göttingen
- Institut für Organische und Biomolekulare Chemie
- 37077 Göttingen, Germany
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18
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Korman CE, Megens M, Ajo-Franklin CM, Horsley DA. Nanopore-spanning lipid bilayers on silicon nitride membranes that seal and selectively transport ions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4421-4425. [PMID: 23528109 DOI: 10.1021/la305064j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We report the formation of POPC lipid bilayers that span 130 nm pores in a freestanding silicon nitride film supported on a silicon substrate. These solvent-free lipid membranes self-assemble on organosilane-treated Si3N4 via the fusion of 200 nm unilamellar vesicles. Membrane fluidity is verified by fluorescence recovery after photobleaching (FRAP), and membrane resistance in excess of 1 GΩ is demonstrated using electrical impedance spectroscopy (EIS). An array of 40,000 membranes maintained high impedance over 72 h, followed by rupture of most of the membranes by 82 h. Membrane incorporation of gramicidin, a model ion channel, resulted in increased membrane conductance. This membrane conductance was diminished when the gramicidin channels were blocked with CaCl2, indicating that the change in membrane conductance results from gramicidin-mediated ion transport. These very stable, biologically functional pore-spanning membranes open many possibilities for silicon-based ion-channel devices for applications such as biosensors and high-throughput drug screening.
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Affiliation(s)
- Christopher E Korman
- Department of Mechanical and Aerospace Engineering, University of California, Davis, California 95616, USA
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19
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Al-Obeidi A, Ge C, Orosz KS, Saavedra SS. ITO/poly(aniline)/sol-gel glass: An optically transparent, pH-responsive substrate for supported lipid bilayers. JOURNAL OF MATERIALS 2013; 2013:676920. [PMID: 25328882 PMCID: PMC4201389 DOI: 10.1155/2013/676920] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Described here is fabrication of a pH-sensitive, optically transparent transducer composed of a planar indium-tin oxide (ITO) electrode overcoated with a a poly(aniline) (PANI) thin film and a porous sol-gel layer. Adsorption of the PANI film renders the ITO electrode sensitive to pH, whereas the sol-gel spin-coated layer makes the upper surface compatible with fusion of phospholipid vesicles to form a planar supported lipid bilayer (PSLB). The response to changes in the pH of the buffer contacting the sol-gel/PANI/ITO electrode is pseudo-Nernstian with a slope of 52 mV/pH over a pH range of 4-9. Vesicle fusion forms a laterally continuous PSLB on the upper sol-gel surface that is fluid with a lateral lipid diffusion coefficient of 2.2 μm2/s measured by fluorescence recovery after photobleaching. Due to its lateral continuity and lack of defects, the PSLB blocks the pH response of the underlying electrode to changes in the pH of the overlying buffer. This architecture is simpler to fabricate than previously reported ITO electrodes derivatized for PSLB formation, and should be useful for optical monitoring of proton transport across supported membranes derivatized with ionophores and ion channels.
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Affiliation(s)
- Ahmed Al-Obeidi
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0041
| | - Chenhao Ge
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0041
| | - Kristina S. Orosz
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0041
| | - S. Scott Saavedra
- Department of Chemistry and Biochemistry, University of Arizona, Tucson, AZ 85721-0041
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20
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Kim YR, Jung S, Ryu H, Yoo YE, Kim SM, Jeon TJ. Synthetic biomimetic membranes and their sensor applications. SENSORS (BASEL, SWITZERLAND) 2012; 12:9530-50. [PMID: 23012557 PMCID: PMC3444115 DOI: 10.3390/s120709530] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2012] [Revised: 06/05/2012] [Accepted: 06/16/2012] [Indexed: 11/16/2022]
Abstract
Synthetic biomimetic membranes provide biological environments to membrane proteins. By exploiting the central roles of biological membranes, it is possible to devise biosensors, drug delivery systems, and nanocontainers using a biomimetic membrane system integrated with functional proteins. Biomimetic membranes can be created with synthetic lipids or block copolymers. These amphiphilic lipids and polymers self-assemble in an aqueous solution either into planar membranes or into vesicles. Using various techniques developed to date, both planar membranes and vesicles can provide versatile and robust platforms for a number of applications. In particular, biomimetic membranes with modified lipids or functional proteins are promising platforms for biosensors. We review recent technologies used to create synthetic biomimetic membranes and their engineered sensors applications.
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Affiliation(s)
- Young-Rok Kim
- Institute of Life Sciences and Resources & Department of Food Science and Biotechnology, Kyung Hee University, Yongin 446-701, Korea; E-Mail:
| | - Sungho Jung
- Department of Biological Engineering, Inha University, Incheon 402-751, Korea; E-Mails: (S.J.); (H.R.)
| | - Hyunil Ryu
- Department of Biological Engineering, Inha University, Incheon 402-751, Korea; E-Mails: (S.J.); (H.R.)
| | - Yeong-Eun Yoo
- Nano-Mechanical Systems Research Division, Korea Institute of Machinery and Materials, Daejeon 305-343, Korea; E-Mail:
| | - Sun Min Kim
- Department of Mechanical Engineering, Inha University, Incheon 402-751, Korea; E-Mail:
- Biohybrid Systems Research Center, Inha University, Incheon 402-751, Korea
| | - Tae-Joon Jeon
- Department of Biological Engineering, Inha University, Incheon 402-751, Korea; E-Mails: (S.J.); (H.R.)
- Biohybrid Systems Research Center, Inha University, Incheon 402-751, Korea
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21
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Kozuch J, Steinem C, Hildebrandt P, Millo D. Combined Electrochemistry and Surface-Enhanced Infrared Absorption Spectroscopy of Gramicidin A Incorporated into Tethered Bilayer Lipid Membranes. Angew Chem Int Ed Engl 2012; 51:8114-7. [DOI: 10.1002/anie.201203214] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2012] [Indexed: 11/06/2022]
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22
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Kozuch J, Steinem C, Hildebrandt P, Millo D. Kombinierte elektrochemische und oberflächenverstärkte IR-absorptionsspektroskopische Untersuchung von Gramicidin A in trägerfixierten Lipiddoppelschichtmembranen. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201203214] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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23
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Lazzara TD, Carnarius C, Kocun M, Janshoff A, Steinem C. Separating attoliter-sized compartments using fluid pore-spanning lipid bilayers. ACS NANO 2011; 5:6935-6944. [PMID: 21797231 DOI: 10.1021/nn201266e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Anodic aluminum oxide (AAO) is a porous material having aligned cylindrical compartments with 55-60 nm diameter pores, and being several micrometers deep. A protocol was developed to generate pore-spanning fluid lipid bilayers separating the attoliter-sized compartments of the nanoporous material from the bulk solution, while preserving the optical transparency of the AAO. The AAO was selectively functionalized by silane chemistry to spread giant unilamellar vesicles (GUVs) resulting in large continuous membrane patches covering the pores. Formation of fluid single lipid bilayers through GUV rupture could be readily observed by fluorescence microscopy and further supported by conservation of membrane surface area, before and after GUV rupture. Fluorescence recovery after photobleaching gave low immobile fractions (5-15%) and lipid diffusion coefficients similar to those found for bilayers on silica. The entrapment of molecules within the porous underlying cylindrical compartments, as well as the exclusion of macromolecules from the nanopores, demonstrate the barrier function of the pore-spanning membranes and could be investigated in three-dimensions using confocal laser scanning fluorescence imaging.
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Affiliation(s)
- Thomas D Lazzara
- Institute of Organic and Biomolecular Chemistry, Tammannstrasse 2, 37077 Göttingen, Germany
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24
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Kumar K, Isa L, Egner A, Schmidt R, Textor M, Reimhult E. Formation of nanopore-spanning lipid bilayers through liposome fusion. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:10920-10928. [PMID: 21749115 DOI: 10.1021/la2019132] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Self-assembly of nanopore-spanning lipid bilayers (npsLBs) paves the way toward chip-based integrated membrane protein biosensing. We present a novel approach to analyze the formation of npsLB at individual nanopores using quantitative analysis of high-resolution microscopy images. From this analysis we derive necessary conditions for the formation of npsLBs on nanopore arrays by liposome fusion and discuss the limitations of the process as a function of nanopore geometry, lipid membrane properties, and surface interaction. Most importantly, applying liposomes with diameters larger than the nanopore is demonstrated to be a necessary but not sufficient condition for npsLB formation. A theoretical model is used to discuss and explain this experimental finding.
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Affiliation(s)
- Karthik Kumar
- Department of Materials, Laboratory for Surface Science and Technology, Swiss Federal Institute of Technology (ETH Zürich), CH-8093 Zürich, Switzerland
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25
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Ge C, Orosz KS, Armstrong NR, Saavedra SS. Poly(aniline) nanowires in sol-gel coated ITO: a pH-responsive substrate for planar supported lipid bilayers. ACS APPLIED MATERIALS & INTERFACES 2011; 3:2677-85. [PMID: 21707069 PMCID: PMC3145051 DOI: 10.1021/am2004637] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Facilitated ion transport across an artificial lipid bilayer coupled to a solid substrate is a function common to several types of bioelectronic devices based on supported membranes, including biomimetic fuel cells and ion channel biosensors. Described here is fabrication of a pH-sensitive transducer composed of a porous sol-gel layer derivatized with poly(aniline) (PANI) nanowires grown from an underlying planar indium-tin oxide (ITO) electrode. The upper sol-gel surface is hydrophilic, smooth, and compatible with deposition of a planar supported lipid bilayer (PSLB) formed via vesicle fusion. Conducting tip AFM was used to show that the PANI wires are connected to the ITO, which convert this electrode into a potentiometric pH sensor. The response to changes in the pH of the buffer contacting the PANI nanowire/sol-gel/ITO electrode is blocked by the very low ion permeability of the overlying fluid PSLB. The feasibility of using this assembly to monitor facilitated proton transport across the PSLB was demonstrated by doping the membrane with lipophilic ionophores that respond to a transmembrane pH gradient, which produced an apparent proton permeability several orders of magnitude greater than values measured for undoped lipid bilayers.
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Affiliation(s)
- Chenhao Ge
- Department of Chemistry and Biochemistry University of Arizona Tucson, AZ 85721-0041
| | - Kristina S. Orosz
- Department of Chemistry and Biochemistry University of Arizona Tucson, AZ 85721-0041
| | - Neal R. Armstrong
- Department of Chemistry and Biochemistry University of Arizona Tucson, AZ 85721-0041
| | - S. Scott Saavedra
- Department of Chemistry and Biochemistry University of Arizona Tucson, AZ 85721-0041
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26
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Jose B, Mallon CT, Forster RJ, Blackledge C, Keyes TE. Lipid bilayer assembly at a gold nanocavity array. Chem Commun (Camb) 2011; 47:12530-2. [DOI: 10.1039/c1cc15709d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Bally M, Bailey K, Sugihara K, Grieshaber D, Vörös J, Städler B. Liposome and lipid bilayer arrays towards biosensing applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2010; 6:2481-97. [PMID: 20925039 DOI: 10.1002/smll.201000644] [Citation(s) in RCA: 161] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Sensitive and selective biosensors for high-throughput screening are having an increasing impact in modern medical care. The establishment of robust protein biosensing platforms however remains challenging, especially when membrane proteins are involved. Although this type of proteins is of enormous relevance since they are considered in >60% of the pharmaceutical drug targets, their fragile nature (i.e., the requirement to preserve their natural lipid environment to avoid denaturation and loss of function) puts strong additional prerequisites onto a successful biochip. In this review, the leading approaches to create lipid membrane-based arrays towards the creation of membrane protein biosensing platforms are described. Liposomes assembled in micro- and nanoarrays and the successful set-ups containing functional membrane proteins, as well as the use of liposomes in networks, are discussed in the first part. Then, the complementary approaches to create cell-mimicking supported membrane patches on a substrate in an array format will be addressed. Finally, the progress in assembling free-standing (functional) lipid bilayers over nanopore arrays for ion channel sensing will be reported. This review illustrates the rapid pace by which advances are being made towards the creation of a heterogeneous biochip for the high-throughput screening of membrane proteins for diagnostics, drug screening, or drug discovery purposes.
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Affiliation(s)
- Marta Bally
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Zurich, 8092, Switzerland
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28
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Claesson M, Cho NJ, Frank CW, Andersson M. Vesicle adsorption on mesoporous silica and titania. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:16630-16633. [PMID: 20932045 DOI: 10.1021/la102719w] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Lipid bilayer formation via vesicle fusion on mesoporous silica and mesoporous titania was investigated using quartz crystal microbalance with dissipation monitoring (QCM-D) and fluorescent recovery after photobleaching (FRAP). Results showed that lipid bilayers were formed on mesoporous silica and that intact vesicle adsorption was obtained on mesoporous titania. From the FRAP results, it could be concluded that the lipid bilayer was fluid; however, it had a smaller diffusivity constant compared to bilayers supported on a nonporous silica.
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Affiliation(s)
- Maria Claesson
- Department of Chemical and Biological Engineering, Chalmers University of Technology, SE-412 96 Göteborg, Sweden
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29
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Studer A, Demarche S, Langenegger D, Tiefenauer L. Integration and recording of a reconstituted voltage-gated sodium channel in planar lipid bilayers. Biosens Bioelectron 2010; 26:1924-8. [PMID: 20609576 DOI: 10.1016/j.bios.2010.06.008] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2010] [Revised: 06/07/2010] [Accepted: 06/07/2010] [Indexed: 11/29/2022]
Abstract
Functional assays for membrane proteins become increasingly important in biosciences. We demonstrate the integration of reconstituted bacterial voltage-gated sodium channels (NaChBac) into preformed free-standing lipid bilayers by using the nystatin-ergosterol method to promote proteoliposome fusion. Vesicle delivery and subsequent NaChBac activity were monitored, the orientation of the transferred ion channels was assessed measuring at both, positive and negative holding potentials and the channel specificity was demonstrated by adding the blocker nimodipine. A conductance of 120 pS per channel and an opening time in the range of seconds have been observed. Interestingly, we found that fusion of proteoliposomes into preformed free-standing bilayers is limited, if hydrophobically silanized silicon nitride membranes are used as the supporting material. In this case the diameter of the liposome had to be at least 20 times smaller compared to that of the pore to render fusion possible.
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Affiliation(s)
- A Studer
- Paul Scherrer Institut, Department of Biology and Chemistry, Biomolecular Research Laboratory, CH-5232 Villigen PSI, Switzerland.
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30
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Jönsson P, Jonsson MP, Höök F. Sealing of submicrometer wells by a shear-driven lipid bilayer. NANO LETTERS 2010; 10:1900-1906. [PMID: 20405904 DOI: 10.1021/nl100779k] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A supported lipid bilayer (SLB) was formed in a microfluidic channel by vesicle fusion. The SLB, formed on a flat part of the surface, was driven by the shear forces of a bulk flow above the SLB to a part of the surface with embedded submicrometer wells. When using a bulk solution with a pH of 9.5 the advancing lipid bilayer sealed the wells, creating free-spanning membranes, whereas at a pH of 8.0 the SLB instead followed the contour of the wells.
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Affiliation(s)
- Peter Jönsson
- Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden.
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31
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Reimhult E, Baumann MK, Kaufmann S, Kumar K, Spycher PR. Advances in nanopatterned and nanostructured supported lipid membranes and their applications. Biotechnol Genet Eng Rev 2010; 27:185-216. [DOI: 10.1080/02648725.2010.10648150] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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32
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Losic D, Simovic S. Self-ordered nanopore and nanotube platforms for drug delivery applications. Expert Opin Drug Deliv 2009; 6:1363-81. [DOI: 10.1517/17425240903300857] [Citation(s) in RCA: 184] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Dusan Losic
- University of South Australia, Ian Wark Research Institute, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia ;
| | - Spomenka Simovic
- University of South Australia, Ian Wark Research Institute, Mawson Lakes Campus, Mawson Lakes, Adelaide, SA 5095, Australia ;
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33
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Gassmann O, Kreir M, Ambrosi C, Pranskevich J, Oshima A, Röling C, Sosinsky G, Fertig N, Steinem C. The M34A mutant of Connexin26 reveals active conductance states in pore-suspending membranes. J Struct Biol 2009; 168:168-76. [PMID: 19236918 PMCID: PMC2785080 DOI: 10.1016/j.jsb.2009.02.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2008] [Revised: 02/09/2009] [Accepted: 02/11/2009] [Indexed: 11/20/2022]
Abstract
Connexin26 (Cx26) is a member of the connexin family, the building blocks for gap junction intercellular channels. These dodecameric assemblies are involved in gap junction-mediated cell-cell communication allowing the passage of ions and small molecules between two neighboring cells. Mutations in Cx26 lead to the disruption of gap junction-mediated intercellular communication with consequences such as hearing loss and skin disorders. We show here that a mutant of Cx26, M34A, forms an active hemichannel in lipid bilayer experiments. A comparison with the Cx26 wild-type is presented. Two different techniques using micro/nano-structured substrates for the formation of pore-suspending lipid membranes are used. We reconstituted the Cx26 wild-type and Cx26M34A into artificial lipid bilayers and observed single channel activity for each technique, with conductance levels of around 35, 70 and 165 pS for the wild-type. The conductance levels of Cx26M34A were found at around 45 and 70 pS.
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Affiliation(s)
- Oliver Gassmann
- Institute for Organic and Biomolecular Chemistry, University of Göttingen, Germany
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34
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A Cholesterol-Based Tether for Creating Photopatterned Lipid Membrane Arrays on both a Silica and Gold Surface. Chemistry 2009; 15:6363-70. [DOI: 10.1002/chem.200900404] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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35
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Böcker M, Muschter S, Schmitt EK, Steinem C, Schäffer TE. Imaging and patterning of pore-suspending membranes with scanning ion conductance microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:3022-3028. [PMID: 19437710 DOI: 10.1021/la8034227] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Nano-BLMs (black lipid membranes) suspending the pores of highly ordered porous silicon substrates have been proven useful for functional investigations of ion channel proteins by electrical readouts. With the aim to monitor the resistive behavior of nano-BLMs spatially resolved in a contact-free manner, we report here on the visualization of nano-BLMs by means of scanning ion conductance microscopy (SICM). Silicon surfaces with highly ordered pore arrays were coated with a gold layer and functionalized with octadecanethiol before a droplet of 1,2-diphytanoyl-sn-glycero-3-phosphocholine (DPhPC) (2% w/v) dissolved in n-decane was applied. The topography of DPhPC membranes suspending the pores was stably imaged for hours without mechanical contact using SICM. This suggests that SICM provides a significant advantage over atomic force microscopy, where mechanical interactions occur that easily damage the suspended membranes. Dynamic processes such as spreading and rupturing of membranes were spatially and temporally resolved. Furthermore, SICM was used to individually manipulate membranes suspending single pores, thereby writing lithographic patterns into the lipid. The process of local membrane manipulation was correlated to a characteristic signature in the simultaneously recorded ion current. The results show that SICM is well-suited both for contact-free imaging of soft suspended membranes and for local membrane manipulation.
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Affiliation(s)
- Matthias Böcker
- Institute of Applied Physics, University of Erlangen-Nuremberg, Staudtstr. 7, Bldg. A3, 91058 Erlangen, Germany
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36
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Werner JH, Montaño GA, Garcia AL, Zurek NA, Akhadov EA, Lopez GP, Shreve AP. Formation and dynamics of supported phospholipid membranes on a periodic nanotextured substrate. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2986-2993. [PMID: 19437708 DOI: 10.1021/la802249f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have studied and modeled the morphology and dynamics of fluid planar lipid bilayer membranes supported on a textured silicon substrate. The substrate is fabricated to have channels on its surface that are a few hundred nanometers across, with a channel depth of a few hundred nanometers perpendicular to the plane of observation. Using atomic force microscopy and quantitative fluorescence microscopy, we have shown that the bilayer assemblies conform to the underlying nanostructured substrate. As far as dynamics is concerned, when observed over length scales exceeding the dimensions of the nanostructured features, the macroscopic diffusion is anisotropic. However, the macroscopic anisotropy is well simulated using models of diffusion on the nanostructured surface that consider the lipids to diffuse homogeneously and isotropically on the supporting substrate. Consistent with previous observations on less well characterized or less periodic nanostructures, we find that the nanostructured substrate produces an effective anisotropy in macroscopic diffusion of the conformal membrane. More importantly, we demonstrate how quantitative analysis of dynamics probed by larger-scale fluorescence imaging can yield information on nanoscale thin-film morphology.
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Affiliation(s)
- James H Werner
- Center for Integrated Nanotechnologies, Materials Physics and Application Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
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37
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Höök F, Kasemo B, Grunze M, Zauscher S. Quantitative biological surface science: challenges and recent advances. ACS NANO 2008; 2:2428-2436. [PMID: 19206275 DOI: 10.1021/nn800800v] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Biological surface science is a broad, interdisciplinary subfield of surface science, where properties and processes at biological and synthetic surfaces and interfaces are investigated, and where biofunctional surfaces are fabricated. The need to study and to understand biological surfaces and interfaces in liquid environments provides sizable challenges as well as fascinating opportunities. Here, we report on recent progress in biological surface science that was described within the program assembled by the Biomaterial Interface Division of the Science and Technology of Materials, Interfaces and Processes (www.avs.org) during their 55th International Symposium and Exhibition held in Boston, October 19-24, 2008. The selected examples show that the rapid progress in nanoscience and nanotechnology, hand-in-hand with theory and simulation, provides increasingly sophisticated methods and tools to unravel the mechanisms and details of complex processes at biological surfaces and in-depth understanding of biomolecular surface interactions.
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Affiliation(s)
- Fredrik Höök
- Department of Applied Physics, Chalmers University of Technology, Gothenburg, Sweden.
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38
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Baciu CL, Becker J, Janshoff A, Sönnichsen C. Protein-membrane interaction probed by single plasmonic nanoparticles. NANO LETTERS 2008; 8:1724-1728. [PMID: 18459744 DOI: 10.1021/nl080805l] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
We present a nanosized and addressable sensor platform based on membrane coated plasmonic particles and show unequivocally the covering with lipid bilayers as well as the subsequent detection of streptavidin binding to biotinylated lipids. The binding is detected on membrane covered gold nanorods by monitoring the spectral shift by fast single particle spectroscopy (fastSPS) on many particles in parallel. Our approach allows for local analysis of protein interaction with biological membranes as a function of the lateral composition of phase separated membranes.
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Affiliation(s)
- Cristina L Baciu
- Institute of Physical Chemistry, University of Mainz, Mainz, Germany
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Grieshaber D, MacKenzie R, Vörös J, Reimhult E. Electrochemical Biosensors - Sensor Principles and Architectures. SENSORS (BASEL, SWITZERLAND) 2008; 8:1400-1458. [PMID: 27879772 PMCID: PMC3663003 DOI: 10.3390/s80314000] [Citation(s) in RCA: 770] [Impact Index Per Article: 48.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/23/2008] [Accepted: 01/28/2008] [Indexed: 11/16/2022]
Abstract
Quantification of biological or biochemical processes are of utmost importance for medical, biological and biotechnological applications. However, converting the biological information to an easily processed electronic signal is challenging due to the complexity of connecting an electronic device directly to a biological environment. Electrochemical biosensors provide an attractive means to analyze the content of a biological sample due to the direct conversion of a biological event to an electronic signal. Over the past decades several sensing concepts and related devices have been developed. In this review, the most common traditional techniques, such as cyclic voltammetry, chronoamperometry, chronopotentiometry, impedance spectroscopy, and various field-effect transistor based methods are presented along with selected promising novel approaches, such as nanowire or magnetic nanoparticle-based biosensing. Additional measurement techniques, which have been shown useful in combination with electrochemical detection, are also summarized, such as the electrochemical versions of surface plasmon resonance, optical waveguide lightmode spectroscopy, ellipsometry, quartz crystal microbalance, and scanning probe microscopy. The signal transduction and the general performance of electrochemical sensors are often determined by the surface architectures that connect the sensing element to the biological sample at the nanometer scale. The most common surface modification techniques, the various electrochemical transduction mechanisms, and the choice of the recognition receptor molecules all influence the ultimate sensitivity of the sensor. New nanotechnology-based approaches, such as the use of engineered ion-channels in lipid bilayers, the encapsulation of enzymes into vesicles, polymersomes, or polyelectrolyte capsules provide additional possibilities for signal amplification. In particular, this review highlights the importance of the precise control over the delicate interplay between surface nano-architectures, surface functionalization and the chosen sensor transducer principle, as well as the usefulness of complementary characterization tools to interpret and to optimize the sensor response.
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Affiliation(s)
- Dorothee Grieshaber
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland.
| | - Robert MacKenzie
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland.
| | - Janos Vörös
- Laboratory of Biosensors and Bioelectronics, Institute for Biomedical Engineering, ETH Zurich, Gloriastrasse 35, 8092 Zurich, Switzerland.
| | - Erik Reimhult
- Laboratory for Surface Science and Technology, Department of Materials, ETH Zurich, Wolfgang-Pauli-Strasse 10, 8093 Zurich, Switzerland.
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Chapter 3 Pore-Suspending Membranes on Highly Ordered Porous Alumina and Porous Silicon Substrates: Preparation, Characterization, and Application. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/s1554-4516(08)00003-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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