1
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Chimisso V, Maffeis V, Hürlimann D, Palivan CG, Meier W. Self-Assembled Polymeric Membranes and Nanoassemblies on Surfaces: Preparation, Characterization, and Current Applications. Macromol Biosci 2019; 20:e1900257. [PMID: 31549783 DOI: 10.1002/mabi.201900257] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/30/2019] [Indexed: 01/11/2023]
Abstract
Biomembranes play a crucial role in a multitude of biological processes, where high selectivity and efficiency are key points in the reaction course. The outstanding performance of biological membranes is based on the coupling between the membrane and biomolecules, such as membrane proteins. Polymer-based membranes and assemblies represent a great alternative to lipid ones, as their presence not only dramatically increases the mechanical stability of such systems, but also opens the scope to a broad range of chemical functionalities, which can be fine-tuned to selectively combine with a specific biomolecule. Tethering the membranes or nanoassemblies on a solid support opens the way to a class of functional surfaces finding application as sensors, biocomputing systems, molecular recognition, and filtration membranes. Herein, the design, physical assembly, and biomolecule attachment/insertion on/within solid-supported polymeric membranes and nanoassemblies are presented in detail with relevant examples. Furthermore, the models and applications for these materials are highlighted with the recent advances in each field.
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Affiliation(s)
- Vittoria Chimisso
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Viviana Maffeis
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Dimitri Hürlimann
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Cornelia G Palivan
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
| | - Wolfgang Meier
- Department of Chemistry, University of Basel, Mattenstrasse 24a, 4056, Basel, Switzerland
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2
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Leggett GJ. Tools for Low-Dimensional Chemistry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:7589-7602. [PMID: 30365897 DOI: 10.1021/acs.langmuir.8b02672] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Many biological mechanisms can be considered to be low-dimensional systems: their function is determined by molecular objects of reduced dimensionality. Bacterial photosynthesis is a very good example: the photosynthetic pathway is contained within nano-objects (vesicles) whose function is determined by the numbers and nanoscale organization of membrane proteins and by the ratios of the different types of protein that they contain. Systems biology has provided computational models for studying these processes, but there is a need for experimental platforms with which to test their predictions. This Invited Feature Article reviews recent work on the development of tools for the reconstruction of membrane processes on solid surfaces. Photochemical methods provide a powerful, versatile means for the organization of molecules and membranes across length scales from the molecular to the macroscopic. Polymer brushes are highly effective supports for model membranes and versatile functional and structural components in low-dimensional systems. The incorporation of plasmonic elements facilitates enhanced measurement of spectroscopic properties and provides an additional design strategy via the exploitation of quantum optical phenomena. A low-dimensional system that incorporates functional transmembrane proteins and a mechanism for the in situ measurement of proton transport is described.
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Affiliation(s)
- Graham J Leggett
- Department of Chemistry , University of Sheffield , Brook Hill, Sheffield S3 7HF , U.K
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3
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N’Diaye M, Michel JP, Rosilio V. Relevance of charges and polymer mechanical stiffness in the mechanism and kinetics of formation of liponanoparticles probed by the supported bilayer model approach. Phys Chem Chem Phys 2019; 21:4306-4319. [DOI: 10.1039/c8cp06955g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Parameters controlling the mechanism and kinetics of formation of liponanoparticles are determined using supported lipid bilayer models.
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Affiliation(s)
- Marline N’Diaye
- Institut Galien Paris-Sud
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- 92296 Châtenay-Malabry
| | - Jean-Philippe Michel
- Institut Galien Paris-Sud
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- 92296 Châtenay-Malabry
| | - Véronique Rosilio
- Institut Galien Paris-Sud
- CNRS
- Univ. Paris-Sud
- Université Paris-Saclay
- 92296 Châtenay-Malabry
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4
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Chand S, Beales P, Claeyssens F, Ciani B. Topography design in model membranes: Where biology meets physics. Exp Biol Med (Maywood) 2018; 244:294-303. [PMID: 30379575 DOI: 10.1177/1535370218809369] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
IMPACT STATEMENT Artificial membranes with complex topography aid the understanding of biological processes where membrane geometry plays a key regulatory role. In this review, we highlight how emerging material and engineering technologies have been employed to create minimal models of cell signaling pathways, in vitro. These artificial systems allow life scientists to answer ever more challenging questions with regards to mechanisms in cellular biology. In vitro reconstitution of biology is an area that draws on the expertise and collaboration between biophysicists, material scientists and biologists and has recently generated a number of high impact results, some of which are also discussed in this review.
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Affiliation(s)
- Sarina Chand
- 1 Centre for Membrane Structure and Dynamics, Krebs Institute and Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK.,2 The Kroto Research Institute, University of Sheffield, Sheffield S3 7HQ, UK
| | - Paul Beales
- 3 School of Chemistry and Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds LS2 9JT, UK
| | - Frederik Claeyssens
- 2 The Kroto Research Institute, University of Sheffield, Sheffield S3 7HQ, UK
| | - Barbara Ciani
- 1 Centre for Membrane Structure and Dynamics, Krebs Institute and Department of Chemistry, University of Sheffield, Sheffield S3 7HF, UK
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5
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Pardo-Figuerez M, Martin NRW, Player DJ, Roach P, Christie SDR, Capel AJ, Lewis MP. Controlled Arrangement of Neuronal Cells on Surfaces Functionalized with Micropatterned Polymer Brushes. ACS OMEGA 2018; 3:12383-12391. [PMID: 30411006 PMCID: PMC6217525 DOI: 10.1021/acsomega.8b01698] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Accepted: 09/17/2018] [Indexed: 05/03/2023]
Abstract
Conventional in vitro cultures are useful to represent simplistic neuronal behavior; however, the lack of organization results in random neurite spreading. To overcome this problem, control over the directionality of SH-SY5Y cells was attained, utilizing photolithography to pattern the cell-repulsive anionic brush poly(potassium 3-sulfopropyl methacrylate) (PKSPMA) into tracks of 20, 40, 80, and 100 μm width. These data validate the use of PKSPMA brush coatings for a long-term culture of the SH-SY5Y cells, as well as providing a methodology by which the precise deposition of PKSPMA can be utilized to achieve a targeted control over the SH-SY5Y cells. Specifically, the PKSPMA brush patterns prevented cell attachment, allowing the SH-SY5Y cells to grow only on noncoated glass (gaps of 20, 50, 75, and 100 μm width) at different cell densities (5000, 10 000, and 15 000 cells/cm2). This research demonstrates the importance of achieving cell directionality in vitro, while these simplistic models could provide new platforms to study complex neuron-neuron interactions.
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Affiliation(s)
- Maria Pardo-Figuerez
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Neil R. W. Martin
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Darren J. Player
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
- Institute
of Orthopaedics and Musculoskeletal Science, University College London, Stanmore HA7 4LP, U.K.
| | - Paul Roach
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Steven D. R. Christie
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Andrew J. Capel
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
| | - Mark P. Lewis
- National
Centre for Sport and Exercise Medicine (NCSEM), School of
Sport, Exercise and Health Sciences, and Department of Chemistry, School
of Science, Loughborough University, Loughborough LE11 3TU, U.K.
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6
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Madsen J, Ducker RE, Al Jaf O, Cartron ML, Alswieleh AM, Smith CH, Hunter CN, Armes SP, Leggett GJ. Fabrication of microstructured binary polymer brush "corrals" with integral pH sensing for studies of proton transport in model membrane systems. Chem Sci 2018; 9:2238-2251. [PMID: 29719697 PMCID: PMC5897877 DOI: 10.1039/c7sc04424k] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2017] [Accepted: 01/14/2018] [Indexed: 11/21/2022] Open
Abstract
Binary brush structures consisting of poly(cysteine methacrylate) (PCysMA) "corrals" enclosed within poly(oligoethylene glycol methyl ether methacrylate) (POEGMA) "walls" are fabricated simply and efficiently using a two-step photochemical process. First, the C-Cl bonds of 4-(chloromethyl)phenylsilane monolayers are selectively converted into carboxylic acid groups by patterned exposure to UV light through a mask and POEGMA is grown from unmodified chlorinated regions by surface-initiated atom-transfer radical polymerisation (ATRP). Incorporation of a ratiometric fluorescent pH indicator, Nile Blue 2-(methacryloyloxy)ethyl carbamate (NBC), into the polymer brushes facilitates assessment of local changes in pH using a confocal laser scanning microscope with spectral resolution capability. Moreover, the dye label acts as a radical spin trap, enabling removal of halogen end-groups from the brushes via in situ dye addition during the polymerisation process. Second, an initiator is attached to the carboxylic acid-functionalised regions formed by UV photolysis in the patterning step, enabling growth of PCysMA brushes by ATRP. Transfer of the system to THF, a poor solvent for PCysMA, causes collapse of the PCysMA brushes. At the interface between the collapsed brush and solvent, selective derivatisation of amine groups is achieved by reaction with excess glutaraldehyde, facilitating attachment of aminobutyl(nitrile triacetic acid) (NTA). The PCysMA brush collapse is reversed on transfer to water, leaving it fully expanded but only functionalized at the brush-water interface. Following complexation of NTA with Ni2+, attachment of histidine-tagged proteorhodopsin and lipid deposition, light-activated transport of protons into the brush structure is demonstrated by measuring the ratiometric response of NBC in the POEGMA walls.
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Affiliation(s)
- J Madsen
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - R E Ducker
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - O Al Jaf
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - M L Cartron
- Department of Molecular Biology and Biotechnology , University of Sheffield , Western Bank , Sheffield S10 2TN , UK
| | | | - C H Smith
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - C N Hunter
- Department of Molecular Biology and Biotechnology , University of Sheffield , Western Bank , Sheffield S10 2TN , UK
| | - S P Armes
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
| | - G J Leggett
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK . ; ;
- Krebs Institute for Mechanistic Biology , University of Sheffield , Sheffield S10 2TN , UK
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7
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Liu HY, Chen WL, Ober CK, Daniel S. Biologically Complex Planar Cell Plasma Membranes Supported on Polyelectrolyte Cushions Enhance Transmembrane Protein Mobility and Retain Native Orientation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:1061-1072. [PMID: 29020444 DOI: 10.1021/acs.langmuir.7b02945] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Reconstituted supported lipid bilayers (SLB) are widely used as in vitro cell-surface models because they are compatible with a variety of surface-based analytical techniques. However, one of the challenges of using SLBs as a model of the cell surface is the limited complexity in membrane composition, including the incorporation of transmembrane proteins and lipid diversity that may impact the activity of those proteins. Additionally, it is challenging to preserve the transmembrane protein native orientation, function, and mobility in SLBs. Here, we leverage the interaction between cell plasma membrane vesicles and polyelectrolyte brushes to create planar bilayers from cell plasma membrane vesicles that have budded from the cell surface. This approach promotes the direct incorporation of membrane proteins and other species into the planar bilayer without using detergent or reconstitution and preserves membrane constituents. Furthermore, the structure of the polyelectrolyte brush serves as a cushion between the planar bilayer and rigid supporting surface, limiting the interaction of the cytosolic domains of membrane proteins with this surface. Single particle tracking was used to analyze the motion of GPI-linked yellow fluorescent proteins (GPI-YFP) and neon-green fused transmembrane P2X2 receptors (P2X2-neon) and shows that this platform retains over 75% mobility of multipass transmembrane proteins in its native membrane environment. An enzyme accessibility assay confirmed that the protein orientation is preserved and results in the extracellular domain facing toward the bulk phase and the cytosolic side facing the support. Because the platform presented here retains the complexity of the cell plasma membrane and preserves protein orientation and mobility, it is a better representative mimic of native cell surfaces, which may find many applications in biological assays aimed at understanding cell membrane phenomena.
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Affiliation(s)
- Han-Yuan Liu
- Robert F. Smith School of Chemical and Biomolecular Engineering, ‡Department of Material Science and Engineering, Cornell University , Ithaca, New York 14853, United States
| | - Wei-Liang Chen
- Robert F. Smith School of Chemical and Biomolecular Engineering, ‡Department of Material Science and Engineering, Cornell University , Ithaca, New York 14853, United States
| | - Christopher K Ober
- Robert F. Smith School of Chemical and Biomolecular Engineering, ‡Department of Material Science and Engineering, Cornell University , Ithaca, New York 14853, United States
| | - Susan Daniel
- Robert F. Smith School of Chemical and Biomolecular Engineering, ‡Department of Material Science and Engineering, Cornell University , Ithaca, New York 14853, United States
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8
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Nishimura T, Tamura F, Kobayashi S, Tanimoto Y, Hayashi F, Sudo Y, Iwasaki Y, Morigaki K. Hybrid Model Membrane Combining Micropatterned Lipid Bilayer and Hydrophilic Polymer Brush. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:5752-5759. [PMID: 28514175 DOI: 10.1021/acs.langmuir.7b00463] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Substrate-supported planar lipid bilayers (SPBs) are being utilized as a versatile model system of the biological membrane. However, the proximity between the solid support and membrane limits utility of SPBs for the functional analyses of membrane proteins. Here, we present a model membrane that can enlarge the distance between the substrate surface and the membrane by combining a stable scaffold of polymerized lipid bilayer with a hydrophilic polymer brush. A micropatterned SPB was generated by the lithographic polymerization of diacetylene lipids and subsequent incorporation of natural (fluid) lipid bilayers. Hydrophilic polymer brush of poly-2-methacryloyloxyethyl phosphorylcholine (poly(MPC)) was formed on the surface of polymeric bilayer by the in situ atom transfer radical polymerization (ATRP) in aqueous solution, in the presence of embedded fluid lipid bilayers. A model membrane protein (Haloquadratum walsbyi bacteriorhodopsin: HwBR) could be reconstituted into the polymer brush-supported bilayers with significantly reduced immobile molecules. Furthermore, the polymer brush terminals could be functionalized by successively polymerizing MPC and 2-aminoethyl methacrylate (AMA). The reactive amine moiety of poly(AMA) enables to conjugate a wide range of biological molecules and surfaces to the membrane. The combination of micropatterned bilayer and polymer brush mimics the two- and three-dimensional structures of the biological membrane, providing a platform to assay membrane proteins in a truly biomimetic environment.
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Affiliation(s)
| | | | | | | | | | - Yuki Sudo
- Graduate School of Medicine, Dentistry, and Pharmaceutical Sciences, Okayama University , 1-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
| | - Yasuhiko Iwasaki
- Faculty of Chemistry, Materials and Bioengineering, Kansai University , 3-3-35 Yamatecho, Suita 564-8680, Japan
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9
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Johnson A, Madsen J, Chapman P, Alswieleh A, Al-Jaf O, Bao P, Hurley CR, Cartron ML, Evans SD, Hobbs JK, Hunter CN, Armes SP, Leggett GJ. Micrometre and nanometre scale patterning of binary polymer brushes, supported lipid bilayers and proteins. Chem Sci 2017; 8:4517-4526. [PMID: 28660065 PMCID: PMC5472033 DOI: 10.1039/c7sc00289k] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Accepted: 04/10/2017] [Indexed: 01/03/2023] Open
Abstract
Binary polymer brush patterns were fabricated via photodeprotection of an aminosilane with a photo-cleavable nitrophenyl protecting group. UV exposure of the silane film through a mask yields micrometre-scale amine-terminated regions that can be derivatised to incorporate a bromine initiator to facilitate polymer brush growth via atom transfer radical polymerisation (ATRP). Atomic force microscopy (AFM) and imaging secondary ion mass spectrometry (SIMS) confirm that relatively thick brushes can be grown with high spatial confinement. Nanometre-scale patterns were formed by using a Lloyd's mirror interferometer to expose the nitrophenyl-protected aminosilane film. In exposed regions, protein-resistant poly(oligo(ethylene glycol)methyl ether methacrylate) (POEGMEMA) brushes were grown by ATRP and used to define channels as narrow as 141 nm into which proteins could be adsorbed. The contrast in the pattern can be inverted by (i) a simple blocking reaction after UV exposure, (ii) a second deprotection step to expose previously intact protecting groups, and (iii) subsequent brush growth via surface ATRP. Alternatively, two-component brush patterns can be formed. Exposure of a nitrophenyl-protected aminosilane layer either through a mask or to an interferogram, enables growth of an initial POEGMEMA brush. Subsequent UV exposure of the previously intact regions allows attachment of ATRP initiator sites and growth of a second poly(cysteine methacrylate) (PCysMA) brush within photolithographically-defined micrometre or nanometre scale regions. POEGMEMA brushes resist deposition of liposomes, but fluorescence recovery after photobleaching (FRAP) studies confirm that liposomes readily rupture on PCysMA "corrals" defined within POEGMEMA "walls". This leads to the formation of highly mobile supported lipid bilayers that exhibit similar diffusion coefficients to lipid bilayers formed on surfaces such as glass.
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Affiliation(s)
- Alexander Johnson
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
| | - Jeppe Madsen
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
| | - Paul Chapman
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
- Department of Physics and Astronomy , University of Sheffield , Sheffield S3 7RH , UK
| | - Abdullah Alswieleh
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
| | - Omed Al-Jaf
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
| | - Peng Bao
- Molecular and Nanoscale Physics Group , School of Physics and Astronomy , University of Leeds , Leeds LS2 9JT , UK
| | - Claire R Hurley
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
| | - Michaël L Cartron
- Department of Molecular Biology and Biotechnology , University of Sheffield , Western Bank , Sheffield S10 2TN , UK
| | - Stephen D Evans
- Molecular and Nanoscale Physics Group , School of Physics and Astronomy , University of Leeds , Leeds LS2 9JT , UK
| | - Jamie K Hobbs
- Department of Physics and Astronomy , University of Sheffield , Sheffield S3 7RH , UK
- Krebs Institute , University of Sheffield , Sheffield , South Yorkshire S10 2TN , UK
| | - C Neil Hunter
- Department of Molecular Biology and Biotechnology , University of Sheffield , Western Bank , Sheffield S10 2TN , UK
| | - Steven P Armes
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
| | - Graham J Leggett
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield S3 7HF , UK .
- Krebs Institute , University of Sheffield , Sheffield , South Yorkshire S10 2TN , UK
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10
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Higaki Y, Fröhlich B, Yamamoto A, Murakami R, Kaneko M, Takahara A, Tanaka M. Ion-Specific Modulation of Interfacial Interaction Potentials between Solid Substrates and Cell-Sized Particles Mediated via Zwitterionic, Super-Hydrophilic Poly(sulfobetaine) Brushes. J Phys Chem B 2017; 121:1396-1404. [DOI: 10.1021/acs.jpcb.6b11540] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuji Higaki
- Institute
for Materials Chemistry and Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International
Institute for Carbon-Neutral Energy Research (WPI I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Benjamin Fröhlich
- Physical
Chemistry of Biosystems, University of Heidelberg, D69120 Heidelberg, Germany
| | - Akihisa Yamamoto
- Institute
for Integrated Cell-Material Sciences (WPI iCeMS), Kyoto University 606-8501 Kyoto, Japan
| | - Ryo Murakami
- Department
of Mechanical Engineering, Osaka University, 565-0871 Suita, Japan
| | - Makoto Kaneko
- Department
of Mechanical Engineering, Osaka University, 565-0871 Suita, Japan
| | - Atsushi Takahara
- Institute
for Materials Chemistry and Engineering, Kyushu University, 744
Motooka, Nishi-ku, Fukuoka 819-0395, Japan
- International
Institute for Carbon-Neutral Energy Research (WPI I2CNER), Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Motomu Tanaka
- Physical
Chemistry of Biosystems, University of Heidelberg, D69120 Heidelberg, Germany
- Institute
for Integrated Cell-Material Sciences (WPI iCeMS), Kyoto University 606-8501 Kyoto, Japan
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11
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Ando K, Tanabe M, Morigaki K. Nanometric Gap Structure with a Fluid Lipid Bilayer for the Selective Transport and Detection of Biological Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:7958-7964. [PMID: 27427950 DOI: 10.1021/acs.langmuir.6b01405] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The biological membrane is a natural biosensing platform that can detect specific molecules with extremely high sensitivity. We developed a biosensing methodology by combining a model biological membrane and a nanometer-sized gap structure on a glass substrate. The model membrane comprised lithographically patterned polymeric and fluid lipid bilayers. The polymeric bilayer was bonded to a poly(dimethylsiloxane) (PDMS) sheet by using an adhesion layer with a defined thickness (lipid vesicles). Extruded lipid vesicles having a biotin moiety on the surface were used as the adhesion layer in conjunction with the biotin-streptavidin linkage. A gap structure was formed between the fluid bilayer and PDMS (nanogap junction). The thickness of the gap structure was several tens of nanometers, as determined by the thickness of the adhesion layer. The nanogap junction acted as a sensitive biosensing platform. From a mixture of proteins (cholera toxin and albumin), the target protein (cholera toxin) was selectively transported into the gap by the specific binding to a glycolipid (GM1) in the fluid bilayer and lateral diffusion. The target protein molecules were then detected with an elevated signal-to-noise ratio due to the reduced background noise in the nanometric gap. The combination of selective transport and reduced background noise drastically enhanced the sensitivity toward the target protein. The nanogap junction should have broad biomedical applications by realizing highly selective and sensitive biosensing in samples having diverse coexisting molecules.
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Affiliation(s)
- Koji Ando
- Graduate School of Agricultural Science and ‡Biosignal Research Center, Kobe University , Rokkodaicho 1-1, Nada, Kobe 657-8501, Japan
| | - Masashi Tanabe
- Graduate School of Agricultural Science and ‡Biosignal Research Center, Kobe University , Rokkodaicho 1-1, Nada, Kobe 657-8501, Japan
| | - Kenichi Morigaki
- Graduate School of Agricultural Science and ‡Biosignal Research Center, Kobe University , Rokkodaicho 1-1, Nada, Kobe 657-8501, Japan
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12
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Positively charged supported lipid bilayer formation on gold surfaces for neuronal cell culture. Biointerphases 2016; 11:021003. [DOI: 10.1116/1.4945306] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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13
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Andersson J, Köper I. Tethered and Polymer Supported Bilayer Lipid Membranes: Structure and Function. MEMBRANES 2016; 6:E30. [PMID: 27249006 PMCID: PMC4931525 DOI: 10.3390/membranes6020030] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2016] [Revised: 05/24/2016] [Accepted: 05/25/2016] [Indexed: 11/30/2022]
Abstract
Solid supported bilayer lipid membranes are model systems to mimic natural cell membranes in order to understand structural and functional properties of such systems. The use of a model system allows for the use of a wide variety of analytical tools including atomic force microscopy, impedance spectroscopy, neutron reflectometry, and surface plasmon resonance spectroscopy. Among the large number of different types of model membranes polymer-supported and tethered lipid bilayers have been shown to be versatile and useful systems. Both systems consist of a lipid bilayer, which is de-coupled from an underlying support by a spacer cushion. Both systems will be reviewed, with an emphasis on the effect that the spacer moiety has on the bilayer properties.
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Affiliation(s)
- Jakob Andersson
- Flinders Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Adelaide SA 5001, Australia.
| | - Ingo Köper
- Flinders Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders University, Adelaide SA 5001, Australia.
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14
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Brisson ERL, Xiao Z, Connal LA. Amino Acid Functional Polymers: Biomimetic Polymer Design Enabling Catalysis, Chiral Materials, and Drug Delivery. Aust J Chem 2016. [DOI: 10.1071/ch16028] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Amino acids are the natural building blocks for the world around us. Highly functional, these small molecules have unique catalytic properties, chirality, and biocompatibility. Imparting these properties to surfaces and other macromolecules is highly sought after and represents a fast-growing field. Polymers functionalized with amino acids in the side chains have tunable optical properties, pH responsiveness, biocompatibility, structure and self-assembly properties. Herein, we review the synthesis of amino acid functional polymers, discuss manipulation of available strategies to achieve the desired responsive materials, and summarize some exciting applications in catalysis, chiral particles, and drug delivery.
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Cheng N, Bao P, Evans SD, Leggett GJ, Armes SP. Facile Formation of Highly Mobile Supported Lipid Bilayers on Surface-Quaternized pH-Responsive Polymer Brushes. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00435] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- N. Cheng
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K
| | - P. Bao
- Molecular and Nanoscale Physics Group,
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
| | - S. D. Evans
- Molecular and Nanoscale Physics Group,
School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, U.K
| | - G. J. Leggett
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K
| | - S. P. Armes
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, U.K
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