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Chuduang K, Pholraksa P, Naumann CA. Capillary-Assisted Assembly of Polymer Gel-Supported Lipid Bilayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39255463 DOI: 10.1021/acs.langmuir.4c01750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2024]
Abstract
The polymer-supported lipid bilayer represents an attractive supramolecular assembly in numerous biophysical and bioanalytical applications. The assembly of polymer-supported membranes with a polymer layer thickness of just a few nanometers is now well-established, but bilayer properties in such a membrane architecture are still influenced by the nearby solid substrate. Polymer-supported lipid bilayer systems with a several micrometers thick polymer layer will overcome this shortcoming. However, formation of a fluid lipid bilayer on a fully hydrated, micrometer thick polymer film using traditional methods (e.g., vesicle fusion and lipid monolayer deposition techniques) remains a challenging task due to the rather unfavorable interfacial conditions for bilayer formation in such a system. Here, we report for the first time on the facile capillary-assisted formation of a lipid bilayer on the surface of a fully hydrated, several micrometers thick polyacrylamide (PAA) gel, in which forced molecular crowding of lipids at the air-water interface of the capillary results in monolayer instability and collapse, thereby forming a lipid bilayer on the top of the polymer gel inside the capillary. Stable bilayer attachment on the surface of the polymer gel can be achieved via physisorption or specific chemical linkages (tethering) on both cross-linked and non-cross-linked PAA films. Unlike the traditional solid-supported lipid bilayer (SLB), the lipid lateral diffusion in the polymer gel-supported lipid bilayer is not anymore perturbed by a solid substrate. Instead, more like a plasma membrane, it is mainly influenced by the properties of the underlying polymer and the nature/distribution of polymer-bilayer attachments. Polymer gel-supported lipid bilayers built using the capillary-assisted assembly approach show attractive self-healing properties, resulting in superior long-term stability relative to the SLB. We hypothesize that the described capillary-assisted assembly method can be applied to a wide range of polymeric materials and lipid compositions, opening exciting opportunities as an advanced model membrane system.
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Affiliation(s)
- Kridnut Chuduang
- Department of Chemistry and Chemical Biology, Indiana University Indianapolis, 402 N. Blackford Street, Indianapolis, Indiana 46202, United States
| | - Pornchanan Pholraksa
- Department of Biology, Indiana University Indianapolis, 402 N. Blackford Street, Indianapolis, Indiana 46202, United States
| | - Christoph A Naumann
- Department of Chemistry and Chemical Biology, Indiana University Indianapolis, 402 N. Blackford Street, Indianapolis, Indiana 46202, United States
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2
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Muñiz‐Chicharro A, Votapka LW, Amaro RE, Wade RC. Brownian dynamics simulations of biomolecular diffusional association processes. WIRES COMPUTATIONAL MOLECULAR SCIENCE 2022. [DOI: 10.1002/wcms.1649] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Abraham Muñiz‐Chicharro
- Molecular and Cellular Modeling Group Heidelberg Institute for Theoretical Studies (HITS) Heidelberg Germany
- Faculty of Biosciences and Heidelberg Graduate School of Mathematical and Computational Methods for the Sciences (HGS MathComp) Heidelberg University Heidelberg Germany
| | | | | | - Rebecca C. Wade
- Molecular and Cellular Modeling Group Heidelberg Institute for Theoretical Studies (HITS) Heidelberg Germany
- Center for Molecular Biology (ZMBH), DKFZ‐ZMBH Alliance, and Interdisciplinary Center for Scientific Computing (IWR) Heidelberg University Heidelberg Germany
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3
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Reinhardt M, Bruce NJ, Kokh DB, Wade RC. Brownian Dynamics Simulations of Proteins in the Presence of Surfaces: Long-Range Electrostatics and Mean-Field Hydrodynamics. J Chem Theory Comput 2021; 17:3510-3524. [PMID: 33784462 DOI: 10.1021/acs.jctc.0c01312] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Simulations of macromolecular diffusion and adsorption in confined environments can offer valuable mechanistic insights into numerous biophysical processes. In order to model solutes at atomic detail on relevant time scales, Brownian dynamics simulations can be carried out with the approximation of rigid body solutes moving through a continuum solvent. This allows the precomputation of interaction potential grids for the solutes, thereby allowing the computationally efficient calculation of forces. However, hydrodynamic and long-range electrostatic interactions cannot be fully treated with grid-based approaches alone. Here, we develop a treatment of both hydrodynamic and electrostatic interactions to include the presence of surfaces by modeling grid-based and long-range interactions. We describe its application to simulate the self-association and many-molecule adsorption of the well-characterized protein hen egg-white lysozyme to mica-like and silica-like surfaces. We find that the computational model can recover a number of experimental observables of the adsorption process and provide insights into their determinants. The computational model is implemented in the Simulation of Diffusional Association (SDA) software package.
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Affiliation(s)
- Martin Reinhardt
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), Schloß-Wolfsbrunnenweg 35, 69118 Heidelberg, Germany.,Department of Theoretical and Computational Biophysics, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany
| | - Neil J Bruce
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), Schloß-Wolfsbrunnenweg 35, 69118 Heidelberg, Germany
| | - Daria B Kokh
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), Schloß-Wolfsbrunnenweg 35, 69118 Heidelberg, Germany
| | - Rebecca C Wade
- Molecular and Cellular Modeling Group, Heidelberg Institute for Theoretical Studies (HITS), Schloß-Wolfsbrunnenweg 35, 69118 Heidelberg, Germany.,Center for Molecular Biology (ZMBH), University of Heidelberg, Im Neuenheimer Feld 282, 69120 Heidelberg, Germany.,Interdisciplinary Center for Scientific Computing (IWR), Heidelberg University, Im Neuenheimer Feld 368, 69120 Heidelberg, Germany
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4
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Kashcooli Y, Park K, Bose A, Greenfield M, Bothun GD. Patchy Layersomes Formed by Layer-by-Layer Coating of Liposomes with Strong Biopolyelectrolytes. Biomacromolecules 2016; 17:3838-3844. [DOI: 10.1021/acs.biomac.6b01467] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Yaser Kashcooli
- Department
of Chemical Engineering, University of Rhode Island, 16 Greenhouse
Road, Kingston, Rhode Island 02881, United States
| | - Keunhan Park
- Department
of Mechanical Engineering, University of Utah, 1495 E 100 S, Salt Lake City, Utah 84112, United States
| | - Arijit Bose
- Department
of Chemical Engineering, University of Rhode Island, 16 Greenhouse
Road, Kingston, Rhode Island 02881, United States
| | - Michael Greenfield
- Department
of Chemical Engineering, University of Rhode Island, 16 Greenhouse
Road, Kingston, Rhode Island 02881, United States
| | - Geoffrey D. Bothun
- Department
of Chemical Engineering, University of Rhode Island, 16 Greenhouse
Road, Kingston, Rhode Island 02881, United States
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5
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Tang K, Besseling NAM. Formation of polyelectrolyte multilayers: ionic strengths and growth regimes. SOFT MATTER 2016; 12:1032-1040. [PMID: 26565521 DOI: 10.1039/c5sm02118a] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
This article presents a study of layer-by-layer (LbL) formation of poly-electrolyte multilayers (PEMs). Upon increasing ionic strength LbL growth patterns vary from linear for the lowest salt concentrations ([NaCl] = 0, 0.001, and 0.01 M) to exponential (for [NaCl] = 0.5 and 1 M). The slope of the linear growth at the lowest ionic strengths increases with increasing [NaCl]. During the LbL process at 0.5 M NaCl we observe a cross over from exponential to linear growth for which the slope is orders of magnitude larger than those observed at low salt concentrations. We provide a comprehensive interpretation of these growth behaviors, which are also reported for many other LbL PEM systems, based on the generic features of the phase diagram of aqueous solutions of mixtures of oppositely charged poly-electrolytes. Processes occurring in LbL formation of PEMs can be understood as moving in the direction of equilibrium, while never achieving it. The experimental model system in this study was: polydiallyldimethylammonium chloride/polystyrene sulfonate (PDADMAC/PSS). PEM formation was followed in situ by optical reflectometry in combination with well-controlled transport conditions (impinging jet stagnation point flow).
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Affiliation(s)
- Kan Tang
- Department of Chemical and Materials Engineering, University of Nevada, Nevada, USA
| | - Nicolaas A M Besseling
- Department Chemical Engineering/OMI, Delft University of Technology, Delft, Netherlands.
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6
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Andersson Trojer M, Nordstierna L, Bergek J, Blanck H, Holmberg K, Nydén M. Use of microcapsules as controlled release devices for coatings. Adv Colloid Interface Sci 2015; 222:18-43. [PMID: 25441449 DOI: 10.1016/j.cis.2014.06.003] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2014] [Revised: 06/06/2014] [Accepted: 06/06/2014] [Indexed: 12/27/2022]
Abstract
Biofouling of surfaces is a considerable problem in many industrial sectors and for the public community in general. The problem is usually approached by the use of functional coatings and most of such antifouling coatings rely on the effect of biocides. However, a substantial drawback is the poor control over the release of the biocide as well as its degradation in the paint. Encapsulation of the biocides in microcapsules is a promising approach that may overcome some of the problems associated with the more traditional ways of incorporating the antifouling agent into the formulation. In this review, we summarize more than a decade of microcapsule research from our lab as well as from other groups working on this topic. Focus will be on two coacervation-based encapsulation techniques; the internal phase separation method and the double emulsion method, which together enable the encapsulation of a broad spectrum of biocides with different physicochemical properties. The release of the biocide from core-shell particles and from encapsulated biocides in coatings is treated in detail. The release behaviour is interpreted in terms of the physicochemical properties of the core-shell particle and the coating matrix. In addition, special attention is given to the experimental release methodology and the implementation of proper diffusion models to describe the release. At the end of the review examples of antifouling properties of some coatings against common biofoulers are presented.
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7
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Blakeston A, Alswieleh AM, Heath GR, Roth JS, Bao P, Cheng N, Armes SP, Leggett GJ, Bushby RJ, Evans SD. New poly(amino acid methacrylate) brush supports the formation of well-defined lipid membranes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:3668-77. [PMID: 25746444 PMCID: PMC4444997 DOI: 10.1021/la504163s] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Revised: 01/29/2015] [Indexed: 05/19/2023]
Abstract
A novel poly(amino acid methacrylate) brush comprising zwitterionic cysteine groups (PCysMA) was utilized as a support for lipid bilayers. The polymer brush provides a 12-nm-thick cushion between the underlying hard support and the aqueous phase. At neutral pH, the zeta potential of the PCysMA brush was ∼-10 mV. Cationic vesicles containing >25% DOTAP were found to form a homogeneous lipid bilayer, as determined by a combination of surface analytical techniques. The lipid mobility as measured by FRAP (fluorescence recovery after photobleaching) gave diffusion coefficients of ∼1.5 μm(2) s(-1), which are comparable to those observed for lipid bilayers on glass substrates.
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Affiliation(s)
- Anita
C. Blakeston
- Molecular
and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United
Kingdom
| | | | - George R. Heath
- Molecular
and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United
Kingdom
| | - Johannes S. Roth
- Molecular
and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United
Kingdom
| | - Peng Bao
- Molecular
and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United
Kingdom
| | - Nan Cheng
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | - Steven P. Armes
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | - Graham J. Leggett
- Department
of Chemistry, University of Sheffield, Sheffield S3 7HF, United Kingdom
| | - Richard J. Bushby
- Molecular
and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United
Kingdom
| | - Stephen D. Evans
- Molecular
and Nanoscale Physics Group, School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, United
Kingdom
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8
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Free energy simulations of amylin I26P mutation in a lipid bilayer. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2014; 44:37-47. [DOI: 10.1007/s00249-014-0999-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2014] [Revised: 11/06/2014] [Accepted: 11/10/2014] [Indexed: 10/24/2022]
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9
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Andersson Trojer M, Li Y, Wallin M, Holmberg K, Nydén M. Charged microcapsules for controlled release of hydrophobic actives Part II: Surface modification by LbL adsorption and lipid bilayer formation on properly anchored dispersant layers. J Colloid Interface Sci 2013; 409:8-17. [DOI: 10.1016/j.jcis.2013.06.070] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2013] [Revised: 06/25/2013] [Accepted: 06/26/2013] [Indexed: 10/26/2022]
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10
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Xavier ACF, de Moraes ML, Ferreira M. Immobilization of aloin encapsulated into liposomes in Layer-by-layer films for transdermal drug delivery. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2013; 33:1193-6. [DOI: 10.1016/j.msec.2012.12.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2012] [Revised: 10/25/2012] [Accepted: 12/02/2012] [Indexed: 10/27/2022]
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11
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Orozco-Alcaraz R, Kuhl TL. Interaction forces between DPPC bilayers on glass. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:337-43. [PMID: 23199333 PMCID: PMC3576029 DOI: 10.1021/la3039329] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
The surface force apparatus (SFA) was utilized to obtain force-distance profiles between silica-supported membranes formed by Langmuir-Blodgett deposition of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC). In the absence of a membrane, a long-range electrostatic repulsion and short-range steric repulsion are measured as a result of the deprotonation of silica in water and the roughness of the silica film. The electrostatic repulsion is partially screened by the lipid membrane, and a van der Waals adhesion comparable to that measured with well-packed DPPC membranes on mica is measured. This finding suggest that electrostatic interactions due to the underlying negatively charged silica are likely present in other systems of glass-supported membranes. In contrast, the charge of an underlying mica substrate is almost completely screened when a lipid membrane is deposited on the mica. The difference in the two systems is attributed to the stronger physisorption of zwitterionic lipids to molecularly smooth mica compared to physisorption to rougher silica.
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Affiliation(s)
- Raquel Orozco-Alcaraz
- University of California Davis. Department of Chemical Engineering and Materials Science, One Shields Avenue, Davis CA 95616
| | - Tonya L. Kuhl
- University of California Davis. Department of Chemical Engineering and Materials Science, One Shields Avenue, Davis CA 95616
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12
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Yashchenok AM, Delcea M, Videnova K, Jares-Erijman EA, Jovin TM, Konrad M, Möhwald H, Skirtach AG. Enzyme Reaction in the Pores of CaCO3 Particles upon Ultrasound Disruption of Attached Substrate-Filled Liposomes. Angew Chem Int Ed Engl 2010; 49:8116-20. [DOI: 10.1002/anie.201003244] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Yashchenok AM, Delcea M, Videnova K, Jares-Erijman EA, Jovin TM, Konrad M, Möhwald H, Skirtach AG. Enzymreaktion in den Poren von CaCO3-Partikeln mit angelagerten, mit Substrat gefüllten Liposomen. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201003244] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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14
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Wende C, Schönhoff M. Dynamics of water in polyelectrolyte multilayers: restricted diffusion and cross-relaxation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:8352-8357. [PMID: 20143885 DOI: 10.1021/la904763j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The diffusion properties of water in polyelectrolyte multilayers (PEM) are investigated by pulsed field gradient diffusion NMR. The dependence of the mean-square displacement on the observation time does not agree to Gaussian diffusion, suggesting restricted diffusion in a porous structure. However, the extraction of a pore size in a model of restricted diffusion yields a very large pore size of several micrometers. The additional influence of cross-relaxation of water and polymer spins is investigated in Goldman-Shen experiments. These demonstrate a strong influence of cross-relaxation rates on diffusion echo decays, such that pore sizes obtained from the model of restricted diffusion have to be corrected. Corrected pore sizes are about 4 microm and reflect the existence of domains of lower polymer density and thus faster water diffusion. These heterogeneities occur upon PEM preparation at high salt content for large layer numbers and are detected in the surface morphology, too.
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Affiliation(s)
- Christina Wende
- Institut für Physikalische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstr. 28/30, D-48147 Münster, Germany
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15
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Aoki PHB, Alessio P, Rodríguez-Méndez ML, De Saja Saez JA, Constantino CJL. Taking advantage of electrostatic interactions to grow Langmuir-Blodgett films containing multilayers of the phospholipid dipalmitoylphosphatidylglycerol. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:13062-13070. [PMID: 19601609 DOI: 10.1021/la901923v] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The use of phospholipids as mimetic systems for studies involving the cell membrane is a well-known approach. In this context, the Langmuir and Langmuir-Blodgett (LB) methods are among the main techniques used to produce ordered layers of phospholipids structured as mono- or bilayers on water subphase and solid substrates. However, the difficulties of producing multilayer LB films of phospholipids restrict the application of this technique depending on the sensitivity of the experimental analysis to be conducted. Here, an alternative approach is used to produce LB films containing multilayers of the negative phospholipid dipalmitoylphosphatidylglycerol (DPPG). Inspired by the electrostatic layer-by-layer (LbL) technique, DPPG multilayer LB films were produced by transferring the DPPG Langmuir monolayers from the water subphase containing low concentrations of the cationic polyelectrolyte poly(allylamine hydrochloride) (PAH) onto solid substrates. Fourier transform infrared (FTIR) absorption spectroscopy revealed that the interactions between the NH(3)(+) (PAH) and PO(4)(-) (DPPG) groups might be the main driving forces that allow growth of these LB films. Besides, ultraviolet-visible (UV-vis) absorption spectroscopy showed that the multilayer LB films can be grown in a controlled way in terms of thickness at nanometer scale. Cyclic voltammetry showed that DPPG and PAH are more packed in the LB than LbL films. The latter finding is related to the distinct molecular architecture of the films since DPPG is structured as monolayers in the LB films and multilamellar vesicles in the LbL films. Despite the interaction with PAH, cyclic voltammetry also showed that DPPG retains its biological activity in LB films, which is a key factor since this makes DPPG a suitable material in sensing applications. Therefore, multilayer LB films were deposited onto Pt interdigitated electrodes forming sensing units, which were applied in the detection of a phenothiazine compound [methylene blue (MB)] using impedance spectroscopy. The performance of DPPG in single-layer and multilayer LB films was compared to the performance of sensing unities composed of DPPG in single-layer and multilayer LbL films, showing the importance of both the thickness and the molecular architecture of the thin films. As found in a previous work for LbL films, the high sensitivity reached by these sensing units is intimately related to changes in the morphology of the film as evidenced by the micro-Raman technique. Finally, the interaction between MB and the (DPPG+PAH) LB films was complemented by pi-A isotherms and surface-enhanced resonance Raman scattering (SERRS).
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Affiliation(s)
- Pedro H B Aoki
- Departamento de Física, Química e Biologia, Faculdade de Ciências e Tecnologia, UNESP, 19060-900 Presidente Prudente, SP, Brazil
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Vieira EP, Rocha S, Carmo Pereira M, Möhwald H, Coelho MAN. Adsorption and diffusion of plasma proteins on hydrophilic and hydrophobic surfaces: effect of trifluoroethanol on protein structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:9879-9886. [PMID: 19705886 DOI: 10.1021/la9009948] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The aim of this work was to investigate the conformational changes and diffusion of adsorbed proteins (immunoglobulin G (IgG), fibrinogen (Fib) and human serum albumin (HSA)) on hydrophilic quartz and hydrophobized quartz (octadecyltrichlorosilane (OTS)) surfaces. Circular dichroism spectroscopy measurements have shown that IgG is the most stable protein after adsorption on hydrophilic quartz, whereas HSA and Fib unfold. The structural changes are dependent on adsorption time, initial protein concentration in bulk, and surface chemistry. The effect of trifluoroethanol (TFE) in recovering the original protein structure after adsorption was analyzed by total internal reflection fluorescence and fluorescence recovery after photobleaching (TIRF-FRAP). TIRF-FRAP experiments revealed a strong dependence of the surface chemistry on protein diffusion coefficients: proteins diffuse 4 times slower on hydrophobic surfaces than on hydrophilic surfaces. The diffusion coefficient of TFE at hydrophobic surfaces is 2 orders magnitude higher than at hydrophilic surfaces. However, protein desorption occurs faster on hydrophilic quartz than on OTS, proving that the strength of protein-surface interaction is weaker at hydrophilic surfaces. This result shows that desorption is determined by surface/protein chemistry and not by mass transfer limitations. FTIR-ATR results demonstrated that TFE interaction with adsorbed proteins is stronger at hydrophilic surfaces than at hydrophobic surfaces.
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Affiliation(s)
- Euridice P Vieira
- Department of Chemical Engineering-LEPAE, Faculty of Engineering, University of Porto, 4200-465 Porto, Portugal
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Kamilya T, Pal P, Mahato M, Talapatra G. Immobilization and the conformational study of phospholipid and phospholipid-protein vesicles. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2009. [DOI: 10.1016/j.msec.2008.12.003] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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18
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Aoki PHB, Volpati D, Riul A, Caetano W, Constantino CJL. Layer-by-layer technique as a new approach to produce nanostructured films containing phospholipids as transducers in sensing applications. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:2331-2338. [PMID: 19161323 DOI: 10.1021/la802696j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Phospholipids are widely used as mimetic systems to exploit interactions involving biological membranes and pharmacological drugs. In this work, the layer-by-layer (LbL) technique was used as a new approach to produce multilayered thin films containing biological phospholipids applied as transducers onto Pt interdigitated electrodes forming sensing units of an electronic tongue system. Low concentrations (nM level) of a phenothiazine compound were detected through impedance spectroscopy. Both negative 1,2-dipalmitoyl-sn-3-glycero-[phosphor-rac-(1-glycerol)] (DPPG) and zwitterionic l-alpha-1,2-dipalmitoyl-sn-3-glycero-phosphatidylcholine (DPPC) phospholipids were used to produce the LbL films, whose molecular architecture was monitored combining spectroscopy and microscopy at micro and nanoscales. The sensor array was complemented by Langmuir-Blodgett (LB) monolayers of DPPG and DPPC deposited onto Pt interdigitated electrodes as well. It was found that the distinct molecular architecture presented by both LbL and LB films plays a key role on the sensitivity of the sensor array with the importance of the LbL films being demonstrated by principal component analysis (PCA).
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Affiliation(s)
- P H B Aoki
- Faculdade de Ciencias e Tecnologia, UNESP, Presidente Prudente/SP, 19060-900 Brazil
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19
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Moraes ML, Baptista MS, Itri R, Zucolotto V, Oliveira ON. Immobilization of liposomes in nanostructured layer-by-layer films containing dendrimers. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2008. [DOI: 10.1016/j.msec.2007.04.017] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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20
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Imre ÁW, Schönhoff M, Cramer C. A conductivity study and calorimetric analysis of dried poly(sodium 4-styrene sulfonate)/poly(diallyldimethylammonium chloride) polyelectrolyte complexes. J Chem Phys 2008; 128:134905. [DOI: 10.1063/1.2901048] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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21
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Tribet C, Vial F. Flexible macromolecules attached to lipid bilayers: impact on fluidity, curvature, permeability and stability of the membranes. SOFT MATTER 2007; 4:68-81. [PMID: 32907085 DOI: 10.1039/b708431p] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
This review summarizes recent investigations on the association of macromolecules on lipid bilayers. Hydrophilic and flexible polymers can form soft coronae tenuously adsorbed or anchored on the lipid membrane. Other synthetic macromolecules are embedded in the apolar region of the membrane. Recent experimental and theoretical works focus on the perturbation of lipid properties achieved depending on the nature and strength of binding. Of importance to biomimicry, to tethered model membranes, and drug carriers, the effects achievable include modulation of the lateral diffusivity of lipids, shape distortions, lateral segregations, formation of well-defined nanopores and ultimately the stimuli responsive disruption of the membrane.
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Affiliation(s)
- Christophe Tribet
- Physico-chimie des Polymères et Milieux Dispersés, CNRS UMR 7615 and Université Paris 6, ESPCI, 10 rue Vauquelin, F-75005 Paris, France
| | - Florent Vial
- Physico-chimie des Polymères et Milieux Dispersés, CNRS UMR 7615 and Université Paris 6, ESPCI, 10 rue Vauquelin, F-75005 Paris, France
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Blin G, Margeat E, Carvalho K, Royer CA, Roy C, Picart C. Quantitative analysis of the binding of ezrin to large unilamellar vesicles containing phosphatidylinositol 4,5 bisphosphate. Biophys J 2007; 94:1021-33. [PMID: 17827228 PMCID: PMC2186265 DOI: 10.1529/biophysj.107.110213] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
The plasma membrane-cytoskeleton interface is a dynamic structure participating in a variety of cellular events. Among the proteins involved in the direct linkage between the cytoskeleton and the plasma membrane is the ezrin/radixin/moesin (ERM) family. The FERM (4.1 ezrin/radixin/moesin) domain in their N-terminus contains a phosphatidylinositol 4,5 bisphosphate (PIP(2)) (membrane) binding site whereas their C-terminus binds actin. In this work, our aim was to quantify the interaction of ezrin with large unilamellar vesicles (LUVs) containing PIP(2). For this purpose, we produced human recombinant ezrin bearing a cysteine residue at its C-terminus for subsequent labeling with Alexa488 maleimide. The functionality of labeled ezrin was checked by comparison with that of wild-type ezrin. The affinity constant between ezrin and LUVs was determined by cosedimentation assays and fluorescence correlation spectroscopy. The affinity was found to be approximately 5 microM for PIP(2)-LUVs and 20- to 70-fold lower for phosphatidylserine-LUVs. These results demonstrate, as well, that the interaction between ezrin and PIP(2)-LUVs is not cooperative. Finally, we found that ezrin FERM domain (area of approximately 30 nm(2)) binding to a single PIP(2) can block access to neighboring PIP(2) molecules and thus contributes to lower the accessible PIP(2) concentration. In addition, no evidence exists for a clustering of PIP(2) induced by ezrin addition.
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Affiliation(s)
- Guillaume Blin
- DIMNP, Universités Montpellier II et I, CNRS, Montpellier cedex 05, France
| | - Emmanuel Margeat
- Institut National de la Sante et de la Recherche Medicale Unité 554, and Université Montpellier, Centre National de Recherche Scientifique, UMR 5048, Centre de Biochimie Structurale, Montpellier, France
| | - Kévin Carvalho
- DIMNP, Universités Montpellier II et I, CNRS, Montpellier cedex 05, France
| | - Catherine A. Royer
- Institut National de la Sante et de la Recherche Medicale Unité 554, and Université Montpellier, Centre National de Recherche Scientifique, UMR 5048, Centre de Biochimie Structurale, Montpellier, France
| | - Christian Roy
- DIMNP, Universités Montpellier II et I, CNRS, Montpellier cedex 05, France
| | - Catherine Picart
- DIMNP, Universités Montpellier II et I, CNRS, Montpellier cedex 05, France
- Address reprint requests to Catherine Picart.
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Ramos L, Schönhoff M, Luan Y, Möhwald H, Brezesinski G. Electrostatic interactions between polyelectrolyte and amphiphiles in two- and three-dimensional systems. Colloids Surf A Physicochem Eng Asp 2007. [DOI: 10.1016/j.colsurfa.2007.03.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sun Q, Tong Z, Wang C, Ren B, Liu X, Zeng F. Charge density threshold for LbL self-assembly and small molecule diffusion in polyelectrolyte multilayer films. POLYMER 2005. [DOI: 10.1016/j.polymer.2005.03.091] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Layer-by-layer self-assembly of polyelectrolyte and the divalent salt of fluorescein. J Photochem Photobiol A Chem 2004. [DOI: 10.1016/j.jphotochem.2004.04.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Wang L, Schönhoff M, Möhwald H. Swelling of Polyelectrolyte Multilayer-Supported Lipid Layers. 1. Layer Stability and Lateral Diffusion. J Phys Chem B 2004. [DOI: 10.1021/jp036413e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Liying Wang
- Max-Planck Institute of Colloids and Interfaces, D-14424 Potsdam/Golm, Germany
| | - Monika Schönhoff
- Max-Planck Institute of Colloids and Interfaces, D-14424 Potsdam/Golm, Germany
| | - Helmuth Möhwald
- Max-Planck Institute of Colloids and Interfaces, D-14424 Potsdam/Golm, Germany
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Mazur M, Blanchard GJ. Photochemical and Electrochemical Oxidation Reactions of Surface-Bound Polycyclic Aromatic Hydrocarbons. J Phys Chem B 2003. [DOI: 10.1021/jp037393j] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maciej Mazur
- Laboratory of Electrochemistry, Department of Chemistry, University of Warsaw, 02-093 Warsaw, Pasteura 1, Poland, and Department of Chemistry, Michigan State University, East Lansing, Michigan 48823-1322
| | - G. J. Blanchard
- Laboratory of Electrochemistry, Department of Chemistry, University of Warsaw, 02-093 Warsaw, Pasteura 1, Poland, and Department of Chemistry, Michigan State University, East Lansing, Michigan 48823-1322
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Dong WF, Sukhorukov GB, Möhwald H. Enhanced Raman imaging and optical spectra of gold nanoparticle doped microcapsules. Phys Chem Chem Phys 2003. [DOI: 10.1039/b301591b] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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