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Seantier B, Kasemo B. Influence of mono- and divalent ions on the formation of supported phospholipid bilayers via vesicle adsorption. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:5767-5772. [PMID: 19358596 DOI: 10.1021/la804172f] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have used the quartz crystal microbalance with dissipation monitoring (QCM-D) technique to investigate how mono- and divalent cations influence the formation of supported (phospho)lipid bilayers (SPB, SLB), occurring via deposition of nanosized palmitoyloleoyl phosphatidylcholine (POPC) vesicles on a SiO2 support. This process is known to proceed via initial adsorption of intact vesicles until a critical surface coverage is reached, where the combination of vesicle-surface and vesicle-vesicle interaction causes the vesicles to rupture. New vesicles then rupture and the lipid fragments fuse until a final continuous bilayer is formed. We have explored how this process and the critical coverage are influenced by different mono- and divalent ions and ion concentrations, keeping the anions the same throughout the experiments. The same qualitative kinetics is observed for all cations. However, different ions cause quite different quantitative kinetics. When compared with monovalent ions, even very small added concentrations of divalent cations cause a strong reduction of the critical coverage, where conversion of intact, adsorbed vesicles to bilayer occurs. This bilayer promoting effect increases in the order Sr2+<Ca2+<Mg2+. Monovalent cations exhibit a much weaker but similar effect in the order Li+>Na+>K+. The results are of practical value for preparation of lipid bilayers and help shed light on the role of ions and on electrostatic effects at membrane surfaces/interfaces.
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Affiliation(s)
- Bastien Seantier
- Chalmers University of Technology, Chemical Physics Group, Applied Physics, Fysikgränd 3, Gothenburg, Sweden.
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Santos O, Arnebrant T. Silica supported phospholipid layers doped with GM1: A comparison between different methods. J Colloid Interface Sci 2009; 329:213-21. [DOI: 10.1016/j.jcis.2008.09.035] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2008] [Revised: 09/11/2008] [Accepted: 09/11/2008] [Indexed: 11/16/2022]
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Phillips KS, Dong Y, Carter D, Cheng Q. Stable and Fluid Ethylphosphocholine Membranes in a Poly(dimethylsiloxane) Microsensor for Toxin Detection in Flooded Waters. Anal Chem 2005; 77:2960-5. [PMID: 15859616 DOI: 10.1021/ac0500481] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Highly stable and fluid supported bilayer membranes were fabricated by fusion of positively charged ethylphosphocholine (DOPC+) vesicles into poly(dimethylsiloxane) (PDMS) microchannels for immunosensing of cholera toxin (CT) in flooded waters. Compared to phosphatidylcholine (PC) layers in the microchannels, DOPC+ membranes show exceptionally strong resistance to air-dry damage, as demonstrated by fluorescence recovery after photobleaching (FRAP) measurements and protein adsorption studies. In FRAP experiments, the mobile fraction of PC membranes was found to decrease by 10% upon drying/rehydration and the lateral diffusion coefficient decreased from 2.2 to 1.6 microm(2)/s, whereas the mobile fraction and diffusion coefficient for DOPC+ membranes remain virtually unchanged during this process. Characterization by confocal microscopy reveals that only 1% of the DOPC+ membrane in the microchannels was removed by the drying/rehydration process, as compared to 11% for PC. Protein adsorption trends indicate that the charge of DOPC+ membranes allows for tuning of solution conditions to enable the desired protein-membrane interaction to predominate at the interface. A flow-based immunoassay for bacterial toxin was developed with 5% GM1/DOPC+ membranes in PDMS channels, and a detection limit of 250 amol for CT was obtained from the calibration curves. The assay was successfully applied to detection of CT spiked in water samples from the Santa Ana River, with nearly identical response and sensitivity.
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Affiliation(s)
- K Scott Phillips
- Department of Chemistry, University of California, Riverside, California 92521, USA
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Granéli A, Rydström J, Kasemo B, Höök F. Utilizing adsorbed proteoliposomes trapped in a non-ruptured state on SiO2 for amplified detection of membrane proteins. Biosens Bioelectron 2004; 20:498-504. [PMID: 15494231 DOI: 10.1016/j.bios.2004.02.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2003] [Revised: 02/19/2004] [Accepted: 02/19/2004] [Indexed: 10/26/2022]
Abstract
The quartz crystal microbalance with dissipation (QCM-D) technique was used to monitor the formation of supported phospholipid bilayers (SPBs) on SiO2 using proteoliposomes with reconstituted proton translocating nicotinamide nucleotide transhydrogenase (TH). Exposure of the surface to such proteoliposomes creates a lipid film composed of a mixture of proteolipid bilayers and adsorbed non-ruptured proteoliposomes, where the fraction of the latter is reduced if the TH-liposomes are pretreated with trypsin to remove the water soluble domains of TH [Langmuir 19 (2003) 842]. In the present work, the latter study is complemented by investigating the influence of trypsin treatment of the mixed adlayer (proteolipid bilayer + non-ruptured proteoliposomes) after adsorption on the surface. This demonstrates how trypsin-cleavage induced rupture of adsorbed TH-liposomes can be utilized to detect the presence of less than 0.04 pmol/cm2 of immobilized TH.
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Affiliation(s)
- Annette Granéli
- Department of Chemical Physics, Applied Physics, Chalmers, Fysikgränd 3, S-41296 Gothenburg, Sweden.
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Melzak KA, Ellar DJ, Gizeli E. Interaction of cytolytic toxin CytB with a supported lipid bilayer: study using an acoustic wave device. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:1386-1392. [PMID: 15803723 DOI: 10.1021/la035469x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
An acoustic technique was used to monitor the interaction of the pore-forming cytolytic toxin CytB with a positively charged supported lipid bilayer. The acoustic device, which is based on a waveguide geometry, is sensitive to changes in the mass of the supported bilayer. The specificity of the interaction, rate and extent of the association, reversibility and effect of previous depositions of toxin were investigated. The CytB was found to bind irreversibly to the lipids at all fractional coverages even when the protein-to-lipid ratio was high enough to imply that the protein was associating with the external surface of the bilayer. The CytB formed stable structures with the bilayer at high protein surface concentrations and did not appear to disrupt the bilayer in the manner of a detergent. The rate of association with the bilayer was found to be directly proportional to the solution concentration of CytB at higher concentrations but appeared to be low at a CytB solution concentration of 5 microg mL(-1), leading to relatively low amounts of CytB being associated with the bilayer.
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Affiliation(s)
- Kathryn A Melzak
- Institute of Biotechnology, University of Cambridge, Cambridge, United Kingdom
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Wang J, Wang L, Liu S, Han X, Huang W, Wang E. Interaction of K7Fe3+P2W17O62H2 with supported bilayer lipid membranes on platinum electrode. Biophys Chem 2003; 106:31-8. [PMID: 14516910 DOI: 10.1016/s0301-4622(03)00158-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The influence of K(7)Fe(3+)P(2)W(17)O(62)H(2) on l-alpha-phosphatidylcholine/cholesterol bilayer lipid membrane on Pt electrode was studied by voltammetry and AC impedance spectroscopy. The interaction of the polyoxometalates with the BLM can promote the access of Ru(NH(3))(6)(3+) and [Fe(CN)(6)](3-/4-) to the electrode surface. It was found that some kind of pores had been formed on the BLM by AFM. The phenomenon is attributed to the interaction of K(7)Fe(3+)P(2)W(17)O(62)H(2) with phosphatidylcholine phosphate groups located in its outer leaflet. Experimental results are helpful to understand the biological activity of the polyoxometalates in vivo.
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Affiliation(s)
- Jianguo Wang
- State Kay Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, Jilin 130022, PR China
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Melzak KA, Gizeli E. A Silicate Gel for Promoting Deposition of Lipid Bilayers. J Colloid Interface Sci 2002; 246:21-8. [PMID: 16290379 DOI: 10.1006/jcis.2001.8054] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2001] [Accepted: 10/22/2001] [Indexed: 11/22/2022]
Abstract
A simple method for modifying a polymer surface to induce lipid bilayer formation by vesicle fusion is described. A silicate gel was prepared by condensation of tetraethyl orthosilicate (TEOS) in the presence of acid. When applied to a poly(methylmethacrylate) substrate, either a rough or a smooth layer could be produced, depending on the method used for the application. The smooth surface induced formation of a supported lipid bilayer by fusion of lipid vesicles; the rough silicate surface induced adsorption of a vesicle layer. A high-frequency acoustic waveguide device was used to follow the initial adsorption of vesicles, the transition from a vesicle layer to a bilayer, and the formation of a complete bilayer; the time required to form a bilayer was determined as a function of lipid concentration in suspension. The presence of a bilayer on the smooth silicate surface was confirmed by fluorescence recovery after photobleaching. An additional procedure is described to modify a gold surface to induce bilayer formation.
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Affiliation(s)
- Kathryn A Melzak
- Institute of Biotechnology, University of Cambridge, Tennis Court Road, Cambridge CB2 1QT, United Kingdom
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Abstract
The sensitivity of the acoustic waveguide sensor to mass deposition in the presence of liquid was optimized as a function of the over-layer thickness. The waveguide geometry consisted of a 0.2-2.2-microm poly(methyl)methacrylate (PMMA) over-layer deposited on the surface of a shear acoustic wave device and supported a Love wave. The response of each polymer-coated waveguide was initially assessed by monitoring the frequency and insertion loss of the device in the presence of air. Sensitivity to viscous and mass loading was studied by recording the amplitude and phase of the wave during the application of water and of a supported lipid bilayer, respectively, on the device surface. Supported bilayers are a versatile system for mass calibration in the presence of liquid because they can be formed spontaneously on a hydrophilic surface, resulting in a layer of reproducible mass density. Results clearly showed that the response of both amplitude and phase depends on the over-layer thickness and increases with the thickness of the polymer layer. Phase was generally found to be more sensitive than amplitude to both viscous water and mass loading. The maximum sensitivity to vesicles deposition was measured at 250 cm2 g(-1) and was detected when 1.3 microm of PMMA was used as a waveguide layer. Results showed that the sensitivity of the acoustic wave sensor can be improved by simply increasing the thickness of the PMMA and that supported phospholipid layers can form an ideal system for both mass calibration and interfacial modification.
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Affiliation(s)
- E Gizeli
- Institute of Biotechnology, University of Cambridge, UK
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Hutter E, Cha S, Liu JF, Park J, Yi J, Fendler JH, Roy D. Role of Substrate Metal in Gold Nanoparticle Enhanced Surface Plasmon Resonance Imaging. J Phys Chem B 2000. [DOI: 10.1021/jp003565q] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- E. Hutter
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
| | - S. Cha
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
| | - J-F. Liu
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
| | - J. Park
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
| | - J. Yi
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
| | - J. H. Fendler
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
| | - D. Roy
- Center for Advanced Materials Processing and Department of Physics, Clarkson University, Potsdam, New York 13699, and Environmental Materials and Process Laboratory, School of Chemical Engineering, Seoul National University, Seoul 151-744, South Korea
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Vikholm I, Viitala T, Albers WM, Peltonen J. Highly efficient immobilisation of antibody fragments to functionalised lipid monolayers. BIOCHIMICA ET BIOPHYSICA ACTA 1999; 1421:39-52. [PMID: 10561470 DOI: 10.1016/s0005-2736(99)00112-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
Abstract
The covalent attachment of Fab' fragments of polyclonal anti-human IgG to a lipid with a terminal linker group was examined by means of quartz crystal microbalance and surface plasmon resonance measurements. The linker lipid was embedded in binary or ternary monolayers of dipalmitoylphosphatidylcholine (DPPC) and cholesterol. Atomic force microscopy images of the films deposited on silanised SiO(2) substrates showed that Fab' fragments take a standing position, thus giving site-directed immobilisation. Human IgG forms a network on interaction with the antibodies. Non-specific binding of bovine serum albumin was found to be very low when DPPC was used as the host matrix. At an optimal Fab' fragment concentration a binding capacity above 60% was obtained. However, if the surface concentration of the immobilised antibodies was too high, the binding capacity decreased due to steric hindrance. The results demonstrate that the covalent coupling of Fab' fragments to N-(epsilon-maleimidocaproyl)-dipalmitoylphosphatidylethanolamine (DPPE-EMC) embedded in a host monolayer matrix of DPPC is a promising approach to achieve a site-directed immobilisation of antibodies with high antigen-binding efficiency.
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Affiliation(s)
- I Vikholm
- VTT Chemical Technology, P.O. Box 14021, FIN-33101, Tampere, Finland
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