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Nerath G, Oliveira DA, Siqueira JR, Caseli L. Using Carbon Nanotubes to Improve Enzyme Activity and Electroactivity of Fatty Acid Langmuir-Blodgett Film-Incorporated Galactose Oxidase for Sensing and Energy Storage Applications. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38334123 DOI: 10.1021/acsami.3c18824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/10/2024]
Abstract
Incorporating enzymes into nanostructured supercapacitor devices represents a groundbreaking advancement in energy storage. Enzyme catalysis using nanomaterials enhances performance, efficiency, and stability by facilitating precise charge transfer, while the nanostructure provides a high surface area and improved conductivity. This synergy yields eco-friendly, high-performance energy storage solutions crucial for diverse applications, from portable electronics to renewable energy systems. In this study, we harnessed the versatility of Langmuir-Blodgett films to create meticulously organized thin films with specific enzyme properties, coupled with carbon nanotubes, to develop biosupercapacitors. Langmuir monolayers were constructed with stearic acid, carbon nanotubes, and galactose oxidase. Following comprehensive characterization using tensiometric, rheological, morphological, and spectroscopic techniques, the monolayers were transferred to solid supports, yielding Langmuir-Blodgett films. These films exhibited superior performance, with persisting enzyme activity. However, increasing film thickness did not enhance enzymatic activity values, indicating a surface-driven process. Subsequently, we explored the electrochemical properties of the films, revealing stability compatible with supercapacitor applications. The introduction of carbon nanotubes demonstrated a higher capacitance, indicating the potential viability of the films for energy storage applications.
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Affiliation(s)
- Gabriel Nerath
- Laboratory of Hybrid Materials (LMH), Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), Diadema 09913-030, São Paulo, Brazil
| | - Danilo A Oliveira
- Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), Uberaba 38064-200, Minas Gerais, Brazil
| | - José R Siqueira
- Laboratory of Applied Nanomaterials and Nanostructures (LANNA), Institute of Exact Sciences, Natural and Education, Federal University of Triângulo Mineiro (UFTM), Uberaba 38064-200, Minas Gerais, Brazil
| | - Luciano Caseli
- Laboratory of Hybrid Materials (LMH), Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (UNIFESP), Diadema 09913-030, São Paulo, Brazil
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2
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Warias JE, Reise F, Hövelmann SC, Giri RP, Röhrl M, Kuhn J, Jacobsen M, Chatterjee K, Arnold T, Shen C, Festersen S, Sartori A, Jordt P, Magnussen OM, Lindhorst TK, Murphy BM. Photoinduced bidirectional switching in lipid membranes containing azobenzene glycolipids. Sci Rep 2023; 13:11480. [PMID: 37455299 PMCID: PMC10350456 DOI: 10.1038/s41598-023-38336-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 07/06/2023] [Indexed: 07/18/2023] Open
Abstract
Following the reaction of biological membranes to external stimuli reveals fundamental insights into cellular function. Here, self-assembled lipid monolayers act as model membranes containing photoswitchable azobenzene glycolipids for investigating structural response during isomerization by combining Langmuir isotherms with X-ray scattering. Controlled in-situ trans/cis photoswitching of the azobenzene N = N double bond alters the DPPC monolayer structure, causing reproducible changes in surface pressure and layer thickness, indicating monolayer reorientation. Interestingly, for monolayers containing azobenzene glycolipids, along with the expected DPPC phase transitions an additional discontinuity is observed. The associated reorintation represents a crossover point, with the surface pressure and layer thickness changing in opposite directions above and below. This is evidence that the azobenzene glycolipids themselves change orientation within the monolayer. Such behaviour suggests that azobenzene glycolipids can act as a bidirectional switch in DPPC monolayers providing a tool to investigate membrane structure-function relationships in depth.
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Affiliation(s)
- Jonas E Warias
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
| | - Franziska Reise
- Otto Diels Institute of Organic Chemistry, Kiel University, Otto-Hahn-Platz 3-4, 24118, Kiel, Germany
| | - Svenja C Hövelmann
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
- Ruprecht Haensel Laboratory, Kiel University, 24118, Kiel, Germany
| | - Rajendra P Giri
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
- Ruprecht Haensel Laboratory, Kiel University, 24118, Kiel, Germany
| | - Michael Röhrl
- Otto Diels Institute of Organic Chemistry, Kiel University, Otto-Hahn-Platz 3-4, 24118, Kiel, Germany
| | - Jule Kuhn
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
| | - Malte Jacobsen
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
| | - Kuntal Chatterjee
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Barkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, 94720, USA
| | - Thomas Arnold
- Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 ODE, UK
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK
- European Spallation Source ERIC, P.O Box 176, 221 00, Lund, Sweden
| | - Chen Shen
- Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607, Hamburg, Germany
| | - Sven Festersen
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
| | - Andrea Sartori
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
- ESRF-The European Synchrotron, 38043, Grenoble, France
| | - Philipp Jordt
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
| | - Olaf M Magnussen
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany
- Ruprecht Haensel Laboratory, Kiel University, 24118, Kiel, Germany
| | - Thisbe K Lindhorst
- Otto Diels Institute of Organic Chemistry, Kiel University, Otto-Hahn-Platz 3-4, 24118, Kiel, Germany
| | - Bridget M Murphy
- Institute of Experimental and Applied Physics, Kiel University, Leibnizstr. 19, 24118, Kiel, Germany.
- Ruprecht Haensel Laboratory, Kiel University, 24118, Kiel, Germany.
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3
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Langeveld SAG, Schwieger C, Beekers I, Blaffert J, van Rooij T, Blume A, Kooiman K. Ligand Distribution and Lipid Phase Behavior in Phospholipid-Coated Microbubbles and Monolayers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:3221-3233. [PMID: 32109064 PMCID: PMC7279639 DOI: 10.1021/acs.langmuir.9b03912] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Phospholipid-coated targeted microbubbles are ultrasound contrast agents that can be used for molecular imaging and enhanced drug delivery. However, a better understanding is needed of their targeting capabilities and how they relate to microstructures in the microbubble coating. Here, we investigated the ligand distribution, lipid phase behavior, and their correlation in targeted microbubbles of clinically relevant sizes, coated with a ternary mixture of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) or 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC), with PEG40-stearate and DSPE-PEG2000. To investigate the effect of lipid handling prior to microbubble production in DSPC-based microbubbles, the components were either dispersed in aqueous medium (direct method) or first dissolved and mixed in an organic solvent (indirect method). To determine the lipid-phase behavior of all components, experiments were conducted on monolayers at the air/water interface. In comparison to pure DSPC and DPPC, the ternary mixtures had an additional transition plateau around 10-12 mN/m. As confirmed by infrared reflection absorption spectroscopy (IRRAS), this plateau was due to a transition in the conformation of the PEGylated components (mushroom to brush). While the condensed phase domains had a different morphology in the ternary DPPC and DSPC monolayers on the Langmuir trough, the domain morphology was similar in the coating of both ternary DPPC and DSPC microbubbles (1.5-8 μm diameter). The ternary DPPC microbubbles had a homogenous ligand distribution and significantly less liquid condensed (LC) phase area in their coating than the DSPC-based microbubbles. For ternary DSPC microbubbles, the ligand distribution and LC phase area in the coating depended on the lipid handling. The direct method resulted in a heterogeneous ligand distribution, less LC phase area than the indirect method, and the ligand colocalizing with the liquid expanded (LE) phase area. The indirect method resulted in a homogenous ligand distribution with the largest LC phase area. In conclusion, lipid handling prior to microbubble production is of importance for a ternary mixture of DSPC, PEG40-stearate, and DSPE-PEG2000.
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Affiliation(s)
- Simone A. G. Langeveld
- Department
of Biomedical Engineering, Thoraxcenter,
Erasmus MC, 3000 CA Rotterdam, The Netherlands
- E-mail: . Phone: +31107044041
| | - Christian Schwieger
- Physical
Chemistry, Institute of Chemistry, Martin
Luther University Halle-Wittenberg, 06099 Halle (Saale), Germany
- Institute
for Biochemistry and Biotechnology, Interdisciplinary Research Center
HALOmem, Martin Luther University Halle-Wittenberg, Charles Tanford Protein Center, 06120 Halle (Saale), Germany
| | - Inés Beekers
- Department
of Biomedical Engineering, Thoraxcenter,
Erasmus MC, 3000 CA Rotterdam, The Netherlands
| | - Jacob Blaffert
- Physical
Chemistry, Institute of Chemistry, Martin
Luther University Halle-Wittenberg, 06099 Halle (Saale), Germany
| | - Tom van Rooij
- Department
of Biomedical Engineering, Thoraxcenter,
Erasmus MC, 3000 CA Rotterdam, The Netherlands
| | - Alfred Blume
- Physical
Chemistry, Institute of Chemistry, Martin
Luther University Halle-Wittenberg, 06099 Halle (Saale), Germany
| | - Klazina Kooiman
- Department
of Biomedical Engineering, Thoraxcenter,
Erasmus MC, 3000 CA Rotterdam, The Netherlands
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Influence of temperature on dynamic surface properties of spread DPPC monolayers in a broad range of surface pressures. Chem Phys Lipids 2019; 225:104812. [DOI: 10.1016/j.chemphyslip.2019.104812] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2019] [Revised: 06/20/2019] [Accepted: 08/17/2019] [Indexed: 12/27/2022]
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5
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Luo M, Dommer AC, Schiffer JM, Rez DJ, Mitchell AR, Amaro RE, Grassian VH. Surfactant Charge Modulates Structure and Stability of Lipase-Embedded Monolayers at Marine-Relevant Aerosol Surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:9050-9060. [PMID: 31188612 DOI: 10.1021/acs.langmuir.9b00689] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Lipases, as well as other enzymes, are present and active within the sea surface microlayer (SSML). Upon bubble bursting, lipases partition into sea spray aerosol (SSA) along with surface-active molecules such as lipids. Lipases are likely to be embedded in the lipid monolayer at the SSA surface and thus have the potential to influence SSA interfacial structure and chemistry. Elucidating the structure of the lipid monolayer at SSA interfaces and how this structure is altered upon interaction with a protein system like lipase is of interest, given the importance of how aerosols interact with sunlight, influence cloud formation, and provide surfaces for chemical reactions. Herein, we report an integrated experimental and computational study of Burkholderia cepacia lipase (BCL) embedded in a lipid monolayer and highlight the important role of electrostatic, rather than hydrophobic, interactions as a driver for monolayer stability. Specifically, we combine Langmuir film experiments and molecular dynamics (MD) simulations to examine the detailed interactions between the zwitterionic dipalmitoylphosphatidylcholine (DPPC) monolayer and BCL. Upon insertion of BCL from the underlying subphase into the lipid monolayer, it is shown that BCL permeates and largely disorders the monolayer while strongly interacting with zwitterionic DPPC molecules, as experimentally observed by Langmuir adsorption curves and infrared reflectance absorbance spectroscopy. Explicitly solvated, all-atom MD is then used to provide insights into inter- and intramolecular interactions that drive these observations, with specific attention to the formation of salt bridges or ionic-bonding interactions. We show that after insertion into the DPPC monolayer, lipase is maintained at high surface pressures and in large BCL concentrations by forming a salt-bridge-stabilized lipase-DPPC complex. In comparison, when embedded in an anionic monolayer at low surface pressures, BCL preferentially forms intramolecular salt bridges, reducing its total favorable interactions with the surfactant and partitioning out of the monolayer shortly after injection. Overall, this study shows that the structure and dynamics of lipase-embedded SSA surfaces vary based on surface charge and pressure and that these variations have the potential to differentially modulate the properties of marine aerosols.
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Affiliation(s)
- Man Luo
- Department of Chemistry and Biochemistry , University of California , San Diego , California 92093 , United States
| | - Abigail C Dommer
- Department of Chemistry and Biochemistry , University of California , San Diego , California 92093 , United States
| | - Jamie M Schiffer
- Janssen Pharmaceuticals , 3210 Merryfield Row , San Diego , California 92093 , United States
| | - Donald J Rez
- Department of Chemistry and Biochemistry , University of California , San Diego , California 92093 , United States
| | - Andrew R Mitchell
- Department of Chemistry and Biochemistry , University of California , San Diego , California 92093 , United States
| | - Rommie E Amaro
- Department of Chemistry and Biochemistry , University of California , San Diego , California 92093 , United States
| | - Vicki H Grassian
- Department of Chemistry and Biochemistry , University of California , San Diego , California 92093 , United States
- Scripps Institution of Oceanography , University of California , San Diego , California 92037 , United States
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6
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Liu X, Riess JG, Krafft MP. Self-Organization of Semifluorinated Alkanes and Related Compounds at Interfaces: Thin Films, Surface Domains and Two-Dimensional Spherulites. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2018. [DOI: 10.1246/bcsj.20170431] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Xianhe Liu
- Institut Charles Sadron (CNRS) University of Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
| | - Jean G. Riess
- Harangoutte Institute, 68160 Sainte Croix-aux-Mines, France
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS) University of Strasbourg, 23 rue du Loess, 67034 Strasbourg, France
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7
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Hasan N, Schwieger C, Tee HT, Wurm FR, Busse K, Kressler J. Crystallization of a polyphosphoester at the air-water interface. Eur Polym J 2018. [DOI: 10.1016/j.eurpolymj.2018.03.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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8
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Niga P, Hansson-Mille PM, Swerin A, Claesson PM, Schoelkopf J, Gane PAC, Bergendal E, Tummino A, Campbell RA, Magnus Johnson C. Interactions between model cell membranes and the neuroactive drug propofol. J Colloid Interface Sci 2018; 526:230-243. [PMID: 29734090 DOI: 10.1016/j.jcis.2018.03.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Revised: 03/12/2018] [Accepted: 03/14/2018] [Indexed: 12/13/2022]
Abstract
Vibrational sum frequency spectroscopy (VSFS) complemented by surface pressure isotherm and neutron reflectometry (NR) experiments were employed to investigate the interactions between propofol, a small amphiphilic molecule that currently is the most common general anaesthetic drug, and phospholipid monolayers. A series of biologically relevant saturated phospholipids of varying chain length from C18 to C14 were spread on either pure water or propofol (2,6-bis(1-methylethyl)phenol) solution in a Langmuir trough, and the change in the molecular structure of the film, induced by the interaction with propofol, was studied with respect to the surface pressure. The results from the surface pressure isotherm experiments revealed that propofol, as long as it remains at the interface, enhances the fluidity of the phospholipid monolayer. The VSF spectra demonstrate that for each phospholipid the amount of propofol in the monolayer region decreases with increasing surface pressure. Such squeeze out is in contrast to the enhanced interactions that can be exhibited by more complex amphiphilic molecules such as peptides. At surface pressures of 22-25 mN m-1, which are relevant for biological cell membranes, most of the propofol has been expelled from the monolayer, especially in the case of the C16 and C18 phospholipids that adopt a liquid condensed phase packing of its alkyl tails. At lower surface pressures of 5 mN m-1, the effect of propofol on the structure of the alkyl tails is enhanced when the phospholipids are present in a liquid expanded phase. Specifically, for the C16 phospholipid, NR data reveal that propofol is located exclusively in the head group region, which is rationalized in the context of previous studies. The results imply a non-homogeneous distribution of propofol in the plane of real cell membranes, which is an inference that requires urgent testing and may help to explain why such low concentration of the drug are required to induce general anaesthesia.
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Affiliation(s)
- Petru Niga
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden.
| | - Petra M Hansson-Mille
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden
| | - Agne Swerin
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden; KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden
| | - Per M Claesson
- RISE - Research Institute of Sweden, Bioscience and Materials - Surface, Process and Formulation Box 5607, SE-114 28 Stockholm, Sweden; KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden
| | | | - Patrick A C Gane
- Omya International AG, Baslerstrasse 42, CH-4665 Oftringen, Switzerland; Aalto University, School of Chemical Engineering, Department of Bioproducts and Biosystems, P.O. Box 16300, FI-00076 Aalto, Helsinki, Finland
| | - Erik Bergendal
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden
| | - Andrea Tummino
- Institut Laue-Langevin, 71 avenue des Martyrs, 38042 Grenoble, France; Eötvös Loránd University, Budapest 112, P.O. Box 32, H-1518, Hungary
| | | | - C Magnus Johnson
- KTH Royal Institute of Technology, Department of Chemistry, Division of Surface and Corrosion Science, SE-100 44 Stockholm, Sweden.
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9
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Binding of the GTPase Sar1 to a Lipid Membrane Monolayer: Insertion and Orientation Studied by Infrared Reflection⁻Absorption Spectroscopy. Polymers (Basel) 2017; 9:polym9110612. [PMID: 30965916 PMCID: PMC6418733 DOI: 10.3390/polym9110612] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 10/26/2017] [Accepted: 11/06/2017] [Indexed: 01/15/2023] Open
Abstract
Membrane-interacting proteins are polyphilic polymers that engage in dynamic protein–protein and protein–lipid interactions while undergoing changes in conformation, orientation and binding interfaces. Predicting the sites of interactions between such polypeptides and phospholipid membranes is still a challenge. One example is the small eukaryotic GTPase Sar1, which functions in phospholipid bilayer remodeling and vesicle formation as part of the multimeric coat protein complex (COPII). The membrane interaction of Sar1 is strongly dependent on its N-terminal 23 amino acids. By monolayer adsorption experiments and infrared reflection-absorption spectroscopy (IRRAS), we elucidate the role of lipids in inducing the amphipathicity of this N-terminal stretch, which inserts into the monolayer as an amphipathic helix (AH). The AH inserting angle is determined and is consistent with the philicities and spatial distribution of the amino acid monomers. Using an advanced method of IRRAS data evaluation, the orientation of Sar1 with respect to the lipid layer prior to the recruitment of further COPII proteins is determined. The result indicates that only a slight reorientation of the membrane-bound Sar1 is needed to allow coat assembly. The time-course of the IRRAS analysis corroborates a role of slow GTP hydrolysis in Sar1 desorption from the membrane.
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Boisselier É, Demers É, Cantin L, Salesse C. How to gather useful and valuable information from protein binding measurements using Langmuir lipid monolayers. Adv Colloid Interface Sci 2017; 243:60-76. [PMID: 28372794 DOI: 10.1016/j.cis.2017.03.004] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2016] [Revised: 03/14/2017] [Accepted: 03/15/2017] [Indexed: 12/22/2022]
Abstract
This review presents data on the influence of various experimental parameters on the binding of proteins onto Langmuir lipid monolayers. The users of the Langmuir methodology are often unaware of the importance of choosing appropriate experimental conditions to validate the data acquired with this method. The protein Retinitis pigmentosa 2 (RP2) has been used throughout this review to illustrate the influence of these experimental parameters on the data gathered with Langmuir monolayers. The methods detailed in this review include the determination of protein binding parameters from the measurement of adsorption isotherms, infrared spectra of the protein in solution and in monolayers, ellipsometric isotherms and fluorescence micrographs.
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Affiliation(s)
- Élodie Boisselier
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada.
| | - Éric Demers
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Line Cantin
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada
| | - Christian Salesse
- CUO-Recherche, Hôpital du Saint-Sacrement, Centre de recherche du CHU de Québec and Département d'ophtalmologie, Faculté de médecine, and Regroupement stratégique PROTEO, Université Laval, Québec, Québec, Canada.
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11
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Schwieger C, Liu X, Krafft MP. Self-assembled mesoscopic surface domains of fluorocarbon–hydrocarbon diblocks can form at zero surface pressure: tilting of solid-like hydrocarbon moieties compensates for cross-section mismatch with fluorocarbon moieties. Phys Chem Chem Phys 2017. [DOI: 10.1039/c7cp02432k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Surface domains of C8F17C16H33 exist at zero surface pressure with solid-like alkyl chains stretched in an all-trans configuration, shown using IRRAS.
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Affiliation(s)
- Christian Schwieger
- Institute of Chemistry
- Martin-Luther University Halle-Wittenberg
- D-06099 Halle (Saale)
- Germany
| | - Xianhe Liu
- Institut Charles Sadron (CNRS)
- University of Strasbourg
- F-67034 Strasbourg
- France
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS)
- University of Strasbourg
- F-67034 Strasbourg
- France
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12
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Lhor M, Bernier SC, Horchani H, Bussières S, Cantin L, Desbat B, Salesse C. Comparison between the behavior of different hydrophobic peptides allowing membrane anchoring of proteins. Adv Colloid Interface Sci 2014; 207:223-39. [PMID: 24560216 PMCID: PMC4028306 DOI: 10.1016/j.cis.2014.01.015] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Revised: 01/11/2014] [Accepted: 01/13/2014] [Indexed: 10/25/2022]
Abstract
Membrane binding of proteins such as short chain dehydrogenase reductases or tail-anchored proteins relies on their N- and/or C-terminal hydrophobic transmembrane segment. In this review, we propose guidelines to characterize such hydrophobic peptide segments using spectroscopic and biophysical measurements. The secondary structure content of the C-terminal peptides of retinol dehydrogenase 8, RGS9-1 anchor protein, lecithin retinol acyl transferase, and of the N-terminal peptide of retinol dehydrogenase 11 has been deduced by prediction tools from their primary sequence as well as by using infrared or circular dichroism analyses. Depending on the solvent and the solubilization method, significant structural differences were observed, often involving α-helices. The helical structure of these peptides was found to be consistent with their presumed membrane binding. Langmuir monolayers have been used as membrane models to study lipid-peptide interactions. The values of maximum insertion pressure obtained for all peptides using a monolayer of 1,2-dioleoyl-sn-glycero-3-phospho-ethanolamine (DOPE) are larger than the estimated lateral pressure of membranes, thus suggesting that they bind membranes. Polarization modulation infrared reflection absorption spectroscopy has been used to determine the structure and orientation of these peptides in the absence and in the presence of a DOPE monolayer. This lipid induced an increase or a decrease in the organization of the peptide secondary structure. Further measurements are necessary using other lipids to better understand the membrane interactions of these peptides.
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Affiliation(s)
- Mustapha Lhor
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Sarah C Bernier
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Habib Horchani
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Sylvain Bussières
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Line Cantin
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada
| | - Bernard Desbat
- CBMN-UMR 5248 CNRS, Université de Bordeaux, IPB, Allée Geoffroy Saint Hilaire, 33600 Pessac, France
| | - Christian Salesse
- CUO-Recherche, Centre de recherche du CHU de Québec, Hôpital du Saint-Sacrement, Département d'ophtalmologie, Faculté de médecine, Université Laval, Québec, Québec G1V 0A6, Canada; Regroupement stratégique PROTEO, Université Laval, Québec, Québec G1V 0A6, Canada.
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13
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Christoforou M, Leontidis E, Brezesinski G. Effects of Sodium Salts of Lyotropic Anions on Low-Temperature, Ordered Lipid Monolayers. J Phys Chem B 2012. [DOI: 10.1021/jp307004e] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- M. Christoforou
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus
| | - E. Leontidis
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus
| | - G. Brezesinski
- Max Planck Institute of Colloids and Interfaces, D-14424 Potsdam-Golm, Germany
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14
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Schwieger C, Chen B, Tschierske C, Kressler J, Blume A. Organization of T-shaped facial amphiphiles at the air/water interface studied by infrared reflection absorption spectroscopy. J Phys Chem B 2012; 116:12245-56. [PMID: 22931365 DOI: 10.1021/jp306612k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We studied the behavior of monolayers at the air/water interface of T-shaped facial amphiphiles which show liquid-crystalline mesophases in the bulk. The compounds are composed of a rigid p-terphenyl core (TP) with two terminal hydrophobic ether linked alkyl chains of equal length and one facial hydrophilic tri(ethylene oxide) chain with a carboxylic acid end group. Due to their amphiphilic nature they form stable Langmuir films at the air/water interface. Depending on the alkyl chain length they show markedly different compression isotherms. We used infrared reflection absorption spectroscopy (IRRAS) to study the changes in molecular organization of the TP films upon compression. We could retrieve information on layer thickness, alkyl chain crystallization, and the orientation of the TP cores within the films. Films of TPs with long (16 carbon atoms: TP 16/3) and short (10 carbon atoms: TP 10/3) alkyl chains were compared. Compression of TP 16/3 leads to crystallization of the terminal alkyl chains, whereas the alkyl chains of TP 10/3 stay fluid over the complete compression range. TP 10/3 shows an extended plateau in the compression isotherm which is due to a layering transition. The mechanism of this layering transition is discussed. Special attention was paid to the question of whether a so-called roll-over collapse occurs during compression. From the beginning to the end of the plateau, the layer thickness is increased from 15 to 38 Å and the orientation of the TP cores changes from parallel to the water surface to isotropic. We conclude that the plateau in the compression isotherm reflects the transition of a TP monolayer to a TP multilayer. The monolayer consists of a sublayer of well-organized TP cores underneath a sublayer of fluid alkyl chains whereas the multilayer consists of a well oriented bottom layer and a disordered top layer. Our findings do not support the model of a roll-over collapse. This study demonstrates how the IRRA band intensity of OH or OD stretching vibrations can be used to retrieve information about layer thickness and refractive indices of the film and how multicomponent IRRA bands can be fitted to retrieve information about the orientation of molecules within the monolayer.
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Affiliation(s)
- Christian Schwieger
- Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, von-Dankelmann-Platz 4, D-06120 Halle (Saale), Germany.
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15
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Ziblat R, Leiserowitz L, Addadi L. Kristalline Lipiddomänen: Charakterisierung durch Röntgenbeugung und ihre Rolle in der Biologie. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201004470] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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16
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Ziblat R, Leiserowitz L, Addadi L. Crystalline lipid domains: characterization by X-ray diffraction and their relation to biology. Angew Chem Int Ed Engl 2011; 50:3620-9. [PMID: 21472900 DOI: 10.1002/anie.201004470] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Indexed: 12/29/2022]
Abstract
Biological membranes comprise thousands of different lipids, differing in their alkyl chains, headgroups, and degree of saturation. It is estimated that 5% of the genes in the human genome are responsible for regulating the lipid composition of cell membranes. Conceivably, the functional explanation for this diversity is found, at least in part, in the propensity of lipids to segregate into distinct domains, which are important for cell function. X-ray diffraction has been used increasingly to characterize the packing and phase behavior of lipids in membranes. Crystalline domains have been studied in synthetic membranes using wide- and small-angle X-ray scattering, and grazing incidence X-ray diffraction. Herein we summarize recent results obtained using the various X-ray methods, discuss the correlation between crystalline domains and liquid ordered domains studied with other techniques, and the relevance of crystalline domains to functional lipid domains in biological membranes.
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Affiliation(s)
- Roy Ziblat
- Department of Structural Biology, Weizmann Institute of Science, 76100 Rehovot, Israel
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17
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Santos HA, García-Morales V, Pereira CM. Electrochemical properties of phospholipid monolayers at liquid-liquid interfaces. Chemphyschem 2010; 11:28-41. [PMID: 19943272 DOI: 10.1002/cphc.200900609] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Biomembrane models built at the interface between two immiscible electrolytes (ITIES) are useful systems to study phenomena of biological relevance by means of their electrochemical processes. The unique properties of ITIES allow one either to control or measure the potential difference across the biomimetic membranes. Herein we focus on phospholipid monolayers adsorbed at liquid-liquid interfaces, and besides discussing recent developments on the subject, we describe electrochemical techniques that can be used to get insight on the interfacial processes and electrostatic properties of phospholipid membranes at the ITIES. In particular, we examine the electrochemical and physicochemical properties of (modified) phospholipid monolayers and their interaction with other biologically relevant compounds. The use of liquid-liquid electrochemistry as a powerful tool to characterize drug properties is outlined. Although this review is not a survey of all the work in the field, it provides a comprehensive referencing to current research.
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Affiliation(s)
- Hélder A Santos
- Division of Pharmaceutical Technology, Faculty of Pharmacy, University of Helsinki, P.O. Box 56 Viikinkaari 5 E, 00014, Finland.
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18
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Mendelsohn R, Mao G, Flach CR. Infrared reflection-absorption spectroscopy: principles and applications to lipid-protein interaction in Langmuir films. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2010; 1798:788-800. [PMID: 20004639 DOI: 10.1016/j.bbamem.2009.11.024] [Citation(s) in RCA: 160] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2009] [Revised: 11/19/2009] [Accepted: 11/24/2009] [Indexed: 01/08/2023]
Abstract
Infrared reflection-absorption spectroscopy (IRRAS) of lipid/protein monolayer films in situ at the air/water interface provides unique molecular structure and orientation information from the film constituents. The technique is thus well suited for studies of lipid/protein interaction in a physiologically relevant environment. Initially, the nature of the IRRAS experiment is described and the molecular structure information that may be obtained is recapitulated. Subsequently, several types of applications, including the determination of lipid chain conformation and tilt as well as elucidation of protein secondary structure are reviewed. The current article attempts to provide the reader with an understanding of the current capabilities of IRRAS instrumentation and the type of results that have been achieved to date from IRRAS studies of lipids, proteins, and lipid/protein films of progressively increasing complexity. Finally, possible extensions of the technology are briefly considered.
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Affiliation(s)
- Richard Mendelsohn
- Department of Chemistry, Newark College, Rutgers University, 73 Warren Street, Newark, NJ 07102, USA.
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19
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Kim YS, Snively CM, Liu Y, Rabolt JF, Chase DB. Real-time imaging of crystallization in polylactide enantiomeric monolayers at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10791-10796. [PMID: 18781784 DOI: 10.1021/la801747k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A newly developed planar array infrared reflection-absorption spectrograph (PA-IRRAS) offers significant advantages over conventional approaches including fast acquisition speed, excellent compensation for water vapor, and an excellent capacity for large infrared accessories, e.g., a water trough. In this study, the origin of stereocomplexation in a polylactide enantiomeric monolayer at the air-water interface was investigated using PA-IRRAS. PA-IRRAS was used as a probe to follow the real-time conformational changes associated with intermolecular interactions of polymer chains during the compression of the monolayers. It was found that a mixture of poly(D-lactic acid) (PDLA) and poly(L-lactic acid) (PLLA) (D/L) formed a stereocomplex when the two-dimensional monolayer developed at the air-water interface before film compression, indicating that there is no direct correlation between film compression and stereocomplexation. PA-IRRAS spectra of the stereocomplex exhibited distinct band shifts in crystalline sensitive components, e.g., the vas(C-O-C, h) mode, as well as amorphous-dependent components, e.g., the vs(C-O-C) mode, when compared with the spectra of PLLA alone. On the other hand, time-resolved PA-IRRAS spectra, which were obtained as the films were being compressed, revealed that both monolayers of PLLA and mixed PLLA/PDLA stereocomplex were crystallized into a 10(3)-helix and a 3(1)-helix, respectively, with a distinct band shift in crystalline sensitive components only. Fourier self-deconvolution of the spectra demonstrated that the band shift in crystalline sensitive components is correlated with the intermolecular interaction of polymer chains.
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Affiliation(s)
- Young Shin Kim
- Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716, USA
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20
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Duncan SL, Larson RG. Comparing experimental and simulated pressure-area isotherms for DPPC. Biophys J 2008; 94:2965-86. [PMID: 18199666 PMCID: PMC2275714 DOI: 10.1529/biophysj.107.114215] [Citation(s) in RCA: 163] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Accepted: 12/03/2007] [Indexed: 11/18/2022] Open
Abstract
Although pressure-area isotherms are commonly measured for lipid monolayers, it is not always appreciated how much they can vary depending on experimental factors. Here, we compare experimental and simulated pressure-area isotherms for dipalmitoylphosphatidylcholine (DPPC) at temperatures ranging between 293.15 K and 323.15 K, and explore possible factors influencing the shape and position of the isotherms. Molecular dynamics simulations of DPPC monolayers using both coarse-grained (CG) and atomistic models yield results that are in rough agreement with some of the experimental isotherms, but with a steeper slope in the liquid-condensed region than seen experimentally and shifted to larger areas. The CG lipid model gives predictions that are very close to those of atomistic simulations, while greatly improving computational efficiency. There is much more variation among experimental isotherms than between isotherms obtained from CG simulations and from the most refined simulation available. Both atomistic and CG simulations yield liquid-condensed and liquid-expanded phase area compressibility moduli that are significantly larger than those typically measured experimentally, but compare well with some experimental values obtained under rapid compression.
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Affiliation(s)
- Susan L Duncan
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan, USA
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21
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Casares JJG, Camacho L, Romero MTM, Cascales JJL. Effect of the barometric phase transition of a DMPA bilayer on the lipid/water interface. An atomistic description by molecular dynamics simulation. J Phys Chem B 2007; 111:13726-33. [PMID: 18004836 DOI: 10.1021/jp075948v] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Understanding the structure and dynamics of phospholipid bilayers is of fundamental relevance in biophysics, biochemistry, and chemical physics. Lipid Langmuir monolayers are used as a model of lipid bilayers, because they are much more easily studied experimentally, although some authors question the validity of this model. With the aim of throwing light on this debate, we used molecular dynamics simulations to obtain an atomistic description of a membrane of dimyristoylphosphatidic acid under different surface pressures. Our results show that at low surface pressure the interdigitation between opposite lipids (that is, back-to-back interactions) controls the system structure. In this setting and due to the absence of this effect in the Langmuir monolayers, the behavior between these two systems differs considerably. However, when the surface pressure increases the lipid interdigitation diminishes and so monolayer and bilayer behavior converges. In this work, four computer simulations were carried out, subjecting the phospholipids to lateral pressures ranging from 0.17 to 40 mN/m. The phospholipids were studied in their charged state because this approach is closer to the experimental situation. Special attention was paid to validating our simulation results by comparison with available experimental data, therebeing in general excellent agreement between experimental and simulation data. In addition, the properties of the lipid/solution interface associated with the lipid barometric phase transition were studied.
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Affiliation(s)
- J J Giner Casares
- Departmento Química Física y TermodinAmica Aplicada, Ed. Marie Curie, Campus de Rabanales, Universidad de Córdoba, 14014 Córdoba, Spain
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22
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Dyck M, Kerth A, Blume A, Lösche M. Interaction of the neurotransmitter, neuropeptide Y, with phospholipid membranes: infrared spectroscopic characterization at the air/water interface. J Phys Chem B 2007; 110:22152-9. [PMID: 17078651 PMCID: PMC2626140 DOI: 10.1021/jp062537q] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The association of neuropeptide Y (NPY) at the air/water interface and with phospholipid monolayers on water as subphase has been investigated using external infrared reflection absorption spectroscopy (IRRAS). Studies of the conformation and orientation of NPY suggest that it adopts an alpha-helical structure and is oriented parallel to the air/water interface in neat peptide monolayers. Both secondary structure and orientation are preserved in mixed lipid/NPY monolayers. Comparison of NPY associated with zwitterionic DPPC and with anionic DMPS suggests that electrostatic attraction plays a major role for peptide binding to the membrane surface.
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23
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He Q, Li J. Hydrolysis characterization of phospholipid monolayers catalyzed by different phospholipases at the air-water interface. Adv Colloid Interface Sci 2007; 131:91-8. [PMID: 17210114 DOI: 10.1016/j.cis.2006.11.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2006] [Accepted: 11/11/2006] [Indexed: 11/22/2022]
Abstract
Combination of some newly developed microscopic and spectroscopic techniques with conventional Langmuir monolayer method can provide more quantitative information with the molecular orientation and reorganization process of spread amphiphilic molecules at the air/water interface. These techniques are extended to investigate the hydrolysis process of spreading lipid monolayer catalyzed by different enzymes, phospholipases A2, C and D, respectively. Synchrotron X-ray diffraction and infrared reflection absorption spectroscopy are able directly to give the structural information of the assembled monolayer, interfacial activity of amphiphiles and their components at the interface. Microscopic technique such as Brewster angle microscopy (BAM), fluorescence microscopy (FM) can be used to trace the morphological changes dynamically as the spreading lipid monolayer is hydrolyzed at the air/water interface. We summary here some latest progress in this filed and give a brief review over the hydrolysis features of phospholipid monolayer catalyzed by different enzymes. It is attempted to establish a model of membrane hydrolysis process in order to better understand the mechanism of membrane metabolism and signal transduction in a living system.
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Affiliation(s)
- Qiang He
- Beijing National Laboratory for Molecular Sciences, International Joint Lab CAS Key Lab of Colloid and Interface Science, Institute of Chemistry, Chinese Academy of Sciences, Zhong Guan Cun, Beijing, PR China
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24
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López Cascales JJ, Otero TF, Fernandez Romero AJ, Camacho L. Phase transition of a DPPC bilayer induced by an external surface pressure: from bilayer to monolayer behavior. a molecular dynamics simulation study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:5818-24. [PMID: 16768513 DOI: 10.1021/la0602315] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Understanding the lipid phase transition of lipid bilayers is of great interest from biophysical, physicochemical, and technological points of view. With the aim of elucidating the structural changes that take place in a DPPC phospholipid bilayer induced by an external isotropic surface pressure, five computer simulations were carried out in a range from 0.1 to 40 mN/m. Molecular dynamics simulations provided insight into the structural changes that took place in the lipid structure. It was seen that low pressures ranging from 0.1 to 1 mN/m had hardly any effect on the structure, electrical properties, or hydration of the lipid bilayer. However, for pressures above 40 mN/m, there was a sharp change in the lipid-lipid interactions, hydrocarbon lipid fluidity, and electrostatic potential, corresponding to the mesomorphic transition from a liquid crystalline state (L(alpha)) to its gel state (P'(beta)). The head lipid orientation remained almost unaltered, parallel to the lipid layer, as the surface pressure was increased, although a noticeable change in its angular distribution function was evident with the phase transition.
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Affiliation(s)
- J J López Cascales
- Centro de Electroquíca y Materiales Inteligentes (CEMI), Universidad Politécnica de Cartagena, Aulario II, Campus de Alfonso XIII, 30203 Cartagena, Murcia, Spain. javier.lopez@ upct.es
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25
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Stottrup BL, Keller SL. Phase behavior of lipid monolayers containing DPPC and cholesterol analogs. Biophys J 2006; 90:3176-83. [PMID: 16461392 PMCID: PMC1432104 DOI: 10.1529/biophysj.105.072959] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We investigate the miscibility phase behavior of lipid monolayers containing a wide variety of sterols. Six of the sterols satisfy a definition from an earlier study of "membrane-active sterols" in bilayers (cholesterol, epicholesterol, lathosterol, dihydrocholesterol, ergosterol, and desmosterol), and six do not (25-hydroxycholesterol, lanosterol, androstenolone, coprostanol, cholestane, and cholestenone). We find that monolayers containing dipalmitoyl phosphatidylcholine mixed with membrane-active sterols generally produce phase diagrams containing two distinct regions of immiscible liquid phases, whereas those with membrane-inactive sterols generally do not. This observation establishes a correlation between lipid monolayers and bilayers. It also demonstrates that the ability to form two regions of immiscibility in monolayers is not one of the biophysical attributes that explains cholesterol's predominance in animal cell membranes. Furthermore, we find unusual phase behavior for dipalmitoyl phosphatidylcholine monolayers containing 25-hydroxycholesterol, which produce both an upper and a lower miscibility transition. The lower transition correlates with a sharp change of slope in the pressure-area isotherm.
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Affiliation(s)
- Benjamin L Stottrup
- Departments of Physics and Chemistry, University of Washington, Seattle, Washington 98195, USA
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26
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Samec Z, Trojánek A, Krtil P. Dynamics of phospholipid monolayers on polarised liquid–liquid interfaces. Faraday Discuss 2005; 129:301-13; discussion 353-66. [PMID: 15715314 DOI: 10.1039/b405377j] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quasi-elastic laser light scattering (QELS) is used to investigate dynamics of the polarised water/1,2-dichloroethane (DCE) interface in the presence of adsorbed DL-alpha-dipalmitoylphosphatidylcholine (DPPC) over a range of the interfacial potential differences (+/-0.3 V) and DPPC concentrations (0-20 microM). An analysis of the frequency of thermally excited capillary waves reveals some novel features in the adsorption of DPPC. The effect of the capillary wavenumber on the capillary wave frequency and the damping factor suggest that the dynamic behaviour of ITIES is consistent with the theoretical predictions for a sharp liquid-liquid interface.
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Affiliation(s)
- Zdenek Samec
- J Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Prague 8, Czech Republic.
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27
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Aroti A, Leontidis E, Maltseva E, Brezesinski G. Effects of Hofmeister Anions on DPPC Langmuir Monolayers at the Air−Water Interface. J Phys Chem B 2004. [DOI: 10.1021/jp0481512] [Citation(s) in RCA: 138] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- A. Aroti
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus and Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany
| | - E. Leontidis
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus and Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany
| | - E. Maltseva
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus and Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany
| | - G. Brezesinski
- Department of Chemistry, University of Cyprus, Nicosia 1678, Cyprus and Max Planck Institute of Colloids and Interfaces, Potsdam 14424, Germany
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28
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Rey Gómez-Serranillos I, Miñones Jr. J, Dynarowicz-Łątka P, Iribarnegaray E, Casas M. Study of the π–A isotherms of miltefosine monolayers spread at the air/water interface. Phys Chem Chem Phys 2004. [DOI: 10.1039/b314439a] [Citation(s) in RCA: 23] [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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29
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Zhang X, Borda MJ, Schoonen MAA, Strongin DR. Pyrite oxidation inhibition by a cross-linked lipid coating. GEOCHEMICAL TRANSACTIONS 2003; 4:8. [PMID: 35412772 PMCID: PMC1475633 DOI: 10.1186/1467-4866-4-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2003] [Accepted: 05/21/2003] [Indexed: 05/23/2023]
Abstract
The effect of a diacetylene-containing phospholipid on the oxidation of pyrite, FeS2, was investigated. Earlier work reported by our research group showed that the adsorption of l,2-bis(10,12-tricosadiynoyl)-sn-glycero-3-phosphocholine on pyrite suppressed the extent of its oxidation by about 75% over a specific time period. Results presented here show that the pre-exposure to UV radiation of this lipid after sorption onto pyrite results in a 90% suppression. Attenuated total reflection (ATR) Fourier transform infra-red spectroscopy (FTIR) suggests that the UV irradiation of the lipid does not result in degradation of the adsorbed layer. It is believed that the UV exposure results in the cross-linking and polymerization of the adsorbed phospholipid into a relatively impermeable barrier that separates the pyrite from the aqueous phase. The results of this study might have implications for the protection of pyrite from oxidation in the environment.
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Affiliation(s)
- Xiang Zhang
- Department of Chemistry, Temple University, Philadelphia, PA 19122
| | - Michael J Borda
- Geosciences Department, The State University of New York at Stony Brook, Stony Brook, NY 11794-2100
| | - Martin AA Schoonen
- Geosciences Department, The State University of New York at Stony Brook, Stony Brook, NY 11794-2100
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30
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Grigoriev DO, Krägel J, Akentiev AV, Noskov BA, Miller R, Pison U. Relation between rheological properties and structural changes in monolayers of model lung surfactant under compression. Biophys Chem 2003; 104:633-42. [PMID: 12914909 DOI: 10.1016/s0301-4622(03)00124-8] [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] [Indexed: 11/27/2022]
Abstract
rSP-C surfactant monolayers spread on a native physiological model substrate show two plateau regions in the pi/A-isotherm. The first corresponds to the main phase transition in the monolayer from a LE to a LC phase. Its course is non-horizontal because of the complex composition of the lung surfactant. The second plateau, which is much more pronounced, cannot be attributed to a change of the phase state. Brewster angle microscopy images taken in this region show a sharp apparent decrease of the aggregation degree from the LE to the LC state. This process can be considered as a change in the monolayer orientation relative to the direction of the propagated light. Such a change can be the result of monolayer folding and formation of a thicker layer, which is supported by results of rheological measurements. The dilatation elasticity obtained from oscillating barrier and longitudinal wave measurements reveals a pure elastic behaviour with a steep increase in the second plateau region. Because of the insolubility of the pure lipid components, a possible explanation is squeezing protein components of rSP-C or its complexes with lipids out of the monolayer into the bulk.
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Affiliation(s)
- D O Grigoriev
- Max-Planck Institut für Kolloid-und Grenzflächenforschung, 14424 Potsdam, Germany.
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31
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Brauner JW, Flach CR, Xu Z, Bi X, Lewis RNAH, McElhaney RN, Gericke A, Mendelsohn R. Quantitative Functional Group Orientation in Langmuir Films by Infrared Reflection−Absorption Spectroscopy: CO Groups in Behenic Acid Methyl Ester and sn2-13C-DSPC. J Phys Chem B 2003. [DOI: 10.1021/jp030066r] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joseph W. Brauner
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Carol R. Flach
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Zhi Xu
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Xiaohong Bi
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Ruthven N. A. H. Lewis
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Ronald N. McElhaney
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Arne Gericke
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
| | - Richard Mendelsohn
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G2H7, Department of Chemistry, Kent State University, Kent, Ohio 44242, and Department of Chemistry, Newark College of Arts and Science, Rutgers University, 73 Warren Street, Newark, New Jersey 07102
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32
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Brezesinski G, Möhwald H. Langmuir monolayers to study interactions at model membrane surfaces. Adv Colloid Interface Sci 2003; 100-102:563-84. [PMID: 12668338 DOI: 10.1016/s0001-8686(02)00071-4] [Citation(s) in RCA: 229] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Langmuir monolayers at the liquid-air interface are well-defined interfacial systems and, therefore, excellent model systems to learn about interactions at interfaces beyond the classical DLVO description. Many parameters can be independently varied over a broad range and the structure can be analyzed with A precision. In the first part of the paper, the rich polymorphism in monolayers composed of amphiphilic molecules is demonstrated. Using homologues series generic phase diagrams can be derived. The delicate interplay of interactions causes a richness of phases which in turn can be used to measure fine variations in these interactions. Based on the understanding of the polymorphism in pure or mixed lipid monolayers, one can study the interaction of molecules dissolved in the subphase with monolayers. Samples presented are chemical reactions catalyzed by enzymes and coupling of polyelectrolytes to oppositely charged monolayers. To relate structure and reactivity, the activity of enzymes at the interface can be studied, predominantly combining X-ray diffraction and FTIR-spectroscopy. It is shown that the activity depends on monolayer structure. In one case, the reaction product leads to structural changes in the monolayer and stops the reaction, hence, indicating a subtle case of product inhibition via the membrane. On the other hand it has become possible to manipulate the organization of polyelectrolytes at interfaces via lipid charge density and ionic strength. In the most important case of DNA interacting with a membrane surface we show that DNA arranges at the interface in a lamellar manner, and the intermolecular distances, measured by Synchrotron X-ray diffraction can be varied by the lipid density.
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Affiliation(s)
- Gerald Brezesinski
- Max-Planck-Institute of Colloids and Interfaces, Am Mühlenberg 1, D-14476, Golm, Germany.
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33
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Mendelsohn R, Flach CR. Infrared reflection-absorption spectroscopy of lipids, peptides, and proteins in aqueous monolayers. CURRENT TOPICS IN MEMBRANES 2002. [DOI: 10.1016/s1063-5823(02)52005-6] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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34
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Ren Y, Hossain MM, Iimura KI, Kato T. CH3(CH2)nCOOH/Cd2+System on the Aqueous Cadmium Acetate Solution Investigated in Situ by Polarization Modulation Infrared Spectroscopy. J Phys Chem B 2001. [DOI: 10.1021/jp010689+] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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35
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Estrela-Lopis I, Brezesinski G, Möhwald H. Dipalmitoyl-phosphatidylcholine/phospholipase D interactions investigated with polarization-modulated infrared reflection absorption spectroscopy. Biophys J 2001; 80:749-54. [PMID: 11159442 PMCID: PMC1301273 DOI: 10.1016/s0006-3495(01)76054-7] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The hydrolysis of 1,2-dipalmitoylphosphatidylcholine (DPPC) catalyzed by Streptomyces chromofuscus phospholipase D (PLD) has been investigated using monolayer techniques and polarization-modulated infrared absorption reflection spectroscopy. The spectroscopic analysis of the phosphate groups provides a quantitative estimation of the hydrolysis yield. The hydrolysis kinetics was investigated in dependence on the phase state of the lipid monolayer. It was found that PLD exhibits maximum activity in the liquid-expanded phase, whereas PLA2 has its activity maximum in the two-phase region. A lag phase was observed in all experiments indicating that small amounts of the hydrolysis product 1,2-dipalmitoylphosphatidic acid (DPPA) are needed for initiating the fast hydrolysis reaction. Higher concentrations of DPPA inhibit the hydrolysis. The critical inhibition concentration of DPPA is a function of the monolayer pressure.
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Affiliation(s)
- I Estrela-Lopis
- Max Planck Institute of Colloids and Interfaces, D-14476 Golm/Potsdam, Germany
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36
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Ren B, Tian ZQ, Guo C, Akins DL. Confocal microprobe Raman spectroscopy for investigating the aggregation process at the liquid/air interface. Chem Phys Lett 2000. [DOI: 10.1016/s0009-2614(00)00901-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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37
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Dahmen-Levison U, Brezesinski G, Möhwald H, Jakob J, Nuhn P. Untersuchungen von Lipid-Protein-Wechselwirkungen an Monoschichten kettensubstituierter Phosphatidylcholine. Angew Chem Int Ed Engl 2000. [DOI: 10.1002/1521-3757(20000804)112:15<2889::aid-ange2889>3.0.co;2-l] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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38
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Reflection–absorption FT–IR spectroscopy of vinyl octadecanoate at the air/water interface. Colloids Surf A Physicochem Eng Asp 1999. [DOI: 10.1016/s0927-7757(99)00074-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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39
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40
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Wege H, Holgado-Terriza J, Gálvez-Ruiz M, Cabrerizo-Vı́lchez M. Development of a new Langmuir-type pendant-drop film balance. Colloids Surf B Biointerfaces 1999. [DOI: 10.1016/s0927-7765(98)00088-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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41
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Sinnamon B, Dluhy R, Barnes G. Reflection–absorption FT-IR spectroscopy of pentadecanoic acid at the air/water interface. Colloids Surf A Physicochem Eng Asp 1999. [DOI: 10.1016/s0927-7757(98)00866-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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Letellier SR, Lochhead MJ, Campbell AA, Vogel V. Oriented growth of calcium oxalate monohydrate crystals beneath phospholipid monolayers. BIOCHIMICA ET BIOPHYSICA ACTA 1998; 1380:31-45. [PMID: 9545525 DOI: 10.1016/s0304-4165(97)00121-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Oriented calcium oxalate crystals have been grown beneath phospholipid monolayers at the air-solution interface from supersaturated calcium oxalate solutions. Mature calcium oxalate crystals grown beneath zwitterionic dipalmitoylphosphatidylcholine (DPPC) monolayers exhibit the characteristic morphology of calcium oxalate monohydrate (COM) crystals with the elongated (101) crystal face preferentially oriented parallel to the plane of the monolayer. Calcium oxalate crystals grown beneath negatively-charged dimyristoylphosphatidylserine (DMPS) monolayers also show a preferential orientation with respect to the monolayer; they do not, however, exhibit the characteristic COM morphology. Raman spectroscopy strongly suggests that the crystals grown beneath either DPPC or DMPS monolayers are the monohydrate phase of calcium oxalate; therefore, differences in crystal morphology are not due to differences in the crystalline phase. Dimyristoylphosphatidylethanolamine (DMPE), dimyristoylphosphatidic acid (DMPA), eicosanoic acid (C20), and eicosanol (C20-OH) monolayers have also been studied to help elucidate the mechanisms of interaction between the lipid monolayers and the calcium oxalate crystals. We discuss the roles of lattice matching, hydrogen bonding, stereochemistry and electrostatics on crystal orientation and morphology.
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Affiliation(s)
- S R Letellier
- Department of Bioengineering, University of Washington, Seattle, USA
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43
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Blaudez D, Buffeteau T, Desbat B, Fournier P, Ritcey AM, Pézolet M. Infrared Reflection−Absorption Spectroscopy of Thin Organic Films on Nonmetallic Substrates: Optimal Angle of Incidence. J Phys Chem B 1998. [DOI: 10.1021/jp9710188] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel Blaudez
- Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux I, 33405 Talence, France, Laboratoire de Spectroscopie Moléculaire et Cristalline, URA 124 du CNRS, Université Bordeaux I, 33405 Talence, France, and CERSIM, Département de Chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada
| | - Thierry Buffeteau
- Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux I, 33405 Talence, France, Laboratoire de Spectroscopie Moléculaire et Cristalline, URA 124 du CNRS, Université Bordeaux I, 33405 Talence, France, and CERSIM, Département de Chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada
| | - Bernard Desbat
- Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux I, 33405 Talence, France, Laboratoire de Spectroscopie Moléculaire et Cristalline, URA 124 du CNRS, Université Bordeaux I, 33405 Talence, France, and CERSIM, Département de Chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada
| | - Patrice Fournier
- Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux I, 33405 Talence, France, Laboratoire de Spectroscopie Moléculaire et Cristalline, URA 124 du CNRS, Université Bordeaux I, 33405 Talence, France, and CERSIM, Département de Chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada
| | - Anna-Marie Ritcey
- Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux I, 33405 Talence, France, Laboratoire de Spectroscopie Moléculaire et Cristalline, URA 124 du CNRS, Université Bordeaux I, 33405 Talence, France, and CERSIM, Département de Chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada
| | - Michel Pézolet
- Centre de Physique Moléculaire Optique et Hertzienne, URA 283 du CNRS, Université Bordeaux I, 33405 Talence, France, Laboratoire de Spectroscopie Moléculaire et Cristalline, URA 124 du CNRS, Université Bordeaux I, 33405 Talence, France, and CERSIM, Département de Chimie, Université Laval, Cité Universitaire, Québec G1K 7P4, Canada
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44
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Fragata M, Bellemare F, Nénonéné EK. Mg(II) Adsorption to a Phosphatidylglycerol Model Membrane Studied by Atomic Absorption and FT-IR Spectroscopy. J Phys Chem B 1997. [DOI: 10.1021/jp962426z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Fragata
- Université du Québec à Trois-Rivières, Département de chimie-biologie, Section de chimie, Trois-Rivières, Québec G9A 5H7, Canada
| | - F. Bellemare
- Université du Québec à Trois-Rivières, Département de chimie-biologie, Section de chimie, Trois-Rivières, Québec G9A 5H7, Canada
| | - E. K. Nénonéné
- Université du Québec à Trois-Rivières, Département de chimie-biologie, Section de chimie, Trois-Rivières, Québec G9A 5H7, Canada
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Manifestation of the liquid-expanded/liquid-condensed phase transition of a dipalmitoylphosphatidylcholine monolayer at the air-water interface. Colloids Surf B Biointerfaces 1997. [DOI: 10.1016/s0927-7765(96)01321-5] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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46
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Structure of the phosphatidylglycerol-photosystem II complex studied by FT-IR spectroscopy. Mg(II) effect on the polar head group of phosphatidylglycerol. J Mol Struct 1997. [DOI: 10.1016/s0022-2860(96)09600-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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47
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Blaudez D, Buffeteau T, Castaings N, Desbat B, Turlet J. Organization in pure and alternate deuterated cadmium arachidate monolayers on solid substrates and at the air/water interface studied by conventional and differential Fourier transform infrared spectroscopies. J Chem Phys 1996. [DOI: 10.1063/1.471726] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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48
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Gericke A, Moore DJ, Erukulla RK, Bittman R, Mendelsohn R. Partially deuterated phospholipids as IR structure probes of conformational order in bulk and monolayer phases. J Mol Struct 1996. [DOI: 10.1016/0022-2860(95)09201-3] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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49
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Li M, Rice SA. Infrared spectroscopic studies of structure and phase transitions in a Langmuir monolayer of H(CH2)23COOH. J Chem Phys 1996. [DOI: 10.1063/1.471353] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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50
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Novel concepts of aggregation structure of fatty acid monolayers on the water surface. STUDIES IN INTERFACE SCIENCE 1996. [DOI: 10.1016/s1383-7303(96)80015-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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