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Watanabe N, Suga K, Umakoshi H. Comparison of Physicochemical Membrane Properties of Vesicles Modified with Guanidinium Derivatives. J Phys Chem B 2017; 121:9213-9222. [PMID: 28820256 DOI: 10.1021/acs.jpcb.7b04007] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Bilayer vesicles have garnered considerable research attention as molecular vehicles capable of noncovalent interaction with biomolecules via electrostatic and hydrophobic bonds and van der Waals interactions. Guanidinium strongly interacts with phosphate groups. Thus, guanidinium modification of vesicles helps intensify the interaction between lipid membranes and nucleic acids. Here, two kinds of guanidinium derivatives, stearylguanidinium (SG) and myristoylarginine (MA), were synthesized and incorporated into 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphatidylcholine (POPC) vesicles. Differences in their membrane properties were evaluated using Fourier transform infrared spectroscopy, Raman spectroscopy, and the fluorescent probes 1,6-diphenyl-1,3,5-hexatriene (DPH), 6-lauroyl-2-dimethylaminonaphthalene (Laurdan), and 2-p-toluidinylnaphthalene-6-sulfonate (TNS). The increased SG ratio increased overall hydrophobicity and lipid packing density compared to POPC vesicles, and SG-modified vesicles successfully attracted and then denatured negatively charged tRNAs (tRNAs). In contrast, MA-modified vesicles did not affect the stiffness of POPC membranes, wherein no conformational change in tRNAs was observed in the presence of POPC/MA vesicles. Analyses of the pH-dependent fluorescence emission of TNS suggested that SG and MA molecules render the membrane surfaces cationic and anionic, respectively, which was also revealed by zeta potential measurements. Our results enabled the construction of a model of the headgroup orientation of zwitterionic POPC molecules controlled by modification with guanidinium derivatives. The results also indicate the possibility to regulate the interaction and conformation of biological molecules, such as nucleic acid.
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Affiliation(s)
- Nozomi Watanabe
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University , 1-3 Machikaneyamacho, Toyonaka, Osaka 560-8531, Japan
| | - Keishi Suga
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University , 1-3 Machikaneyamacho, Toyonaka, Osaka 560-8531, Japan
| | - Hiroshi Umakoshi
- Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University , 1-3 Machikaneyamacho, Toyonaka, Osaka 560-8531, Japan
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2
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Blicher A, Wodzinska K, Fidorra M, Winterhalter M, Heimburg T. The temperature dependence of lipid membrane permeability, its quantized nature, and the influence of anesthetics. Biophys J 2009; 96:4581-91. [PMID: 19486680 DOI: 10.1016/j.bpj.2009.01.062] [Citation(s) in RCA: 128] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2008] [Revised: 01/12/2009] [Accepted: 01/13/2009] [Indexed: 10/20/2022] Open
Abstract
We investigate the permeability of lipid membranes for fluorescence dyes and ions. We find that permeability reaches a maximum close to the chain melting transition of the membranes. Close to transitions, fluctuations in area and compressibility are high, leading to an increased likelihood of spontaneous lipid pore formation. Fluorescence correlation spectroscopy reveals the permeability for rhodamine dyes across 100-nm vesicles. Using fluorescence correlation spectroscopy, we find that the permeability of vesicle membranes for fluorescence dyes is within error proportional to the excess heat capacity. To estimate defect size we measure the conductance of solvent-free planar lipid bilayer. Microscopically, we show that permeation events appear as quantized current events very similar to those reported for channel proteins. Further, we demonstrate that anesthetics lead to a change in membrane permeability that can be predicted from their effect on heat capacity profiles. Depending on temperature, the permeability can be enhanced or reduced. We demonstrate that anesthetics decrease channel conductance and ultimately lead to blocking of the lipid pores in experiments performed at or above the chain melting transition. Our data suggest that the macroscopic increase in permeability close to transitions and microscopic lipid ion channel formation are the same physical process.
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Affiliation(s)
- Andreas Blicher
- Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
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3
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Pickard WF. Modelling the swelling assay for aquaporin expression. J Math Biol 2008; 57:883-903. [DOI: 10.1007/s00285-008-0196-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2007] [Revised: 04/01/2008] [Indexed: 10/21/2022]
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4
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Sabín J, Ruso JM, González-Pérez A, Prieto G, Sarmiento F. Characterization of phospholipid+semifluorinated alkane vesicle system. Colloids Surf B Biointerfaces 2006; 47:64-70. [PMID: 16406518 DOI: 10.1016/j.colsurfb.2005.11.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2005] [Revised: 11/21/2005] [Accepted: 11/28/2005] [Indexed: 11/19/2022]
Abstract
The aim of this study is to characterize vesicles obtained by the incorporation of the semifluorinated alkane, (perfluoro-n-hexyl)ethane (diblock F6H2) to a standard lipid, egg yolk phosphatidylcholine (PC). Large unilamellar vesicles (LUVs), prepared by extrusion, were characterized by fluorescence spectroscopy, zeta potential (zeta-potential) and light scattering. By using the fluorescence spectroscopy technique, the anisotropy of l,6-diphenyl-l,3,5-hexatriene (DPH) probe at different temperatures was determined. It was demonstrated that F6H2 is placed inside of the lipid bilayer and that the hydrocarbon acyl chain in the bilayers has higher viscosity in the presence of fluoroalkane. The zeta-potential of the PC-F6H2 system is negative and increases (in absolute value) from -10 to -19 mV when the temperature rises from 10 to 25 degrees C, this last value keeping practically constant with a further increase of temperature. The adsorption of K+ ions on the liposome surface was measured by zeta-potential. This adsorption originates a sudden increase of the initial zeta-potential followed by a slight decrease with K+ concentration. The application of the DLVO theory of colloidal stability showed a growing dependence of the DLVO potential with K+ concentration and consequently a increasing stability.
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Affiliation(s)
- Juan Sabín
- Biophysics and Interfaces Group, Department of Applied Physics, Faculty of Physics, University of Santiago de Compostela, E-15782 Santiago de Compostela, Spain
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5
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Chapter 2: Surface Properties of Liposomes Depending on Their Composition. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/s1554-4516(06)04002-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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6
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Mingins J, Pethica BA. Intermolecular forces in spread phospholipid monolayers at oil/water interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:7493-7498. [PMID: 15323493 DOI: 10.1021/la040016t] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The lateral intermolecular forces between phospholipids are of particular relevance to the behavior of biomembranes, and have been approached via studies of monolayer isotherms at aqueous interfaces, mostly restricted to air/water (A/W) systems. For thermodynamic properties, the oil/water (O/W) interface has major advantages but is experimentally more difficult and less studied. A comprehensive reanalysis of the available thermodynamic data on spread monolayers of phosphatidyl cholines (PC) and phosphatidyl ethanolamines (PE) at O/W interfaces is conducted to identify the secure key features that will underpin further development of molecular models. Relevant recourse is made to isotherms of single-chain molecules and of mixed monolayers to identify the contributions of chain-chain interactions and interionic forces. The emphasis is on the properties of the phase transitions for a range of oil phases. Apparent published discrepancies in thermodynamic properties are resolved and substantial agreement emerges on the main features of these phospholipid monolayer systems. In compression to low areas, the forces between the zwitterions of like phospholipids are repulsive. The molecular model for phospholipid headgroup interactions developed by Stigter et al. accounts well for the virial coefficients in expanded phospholipid O/W monolayers. Inclusion of the changes in configuration and orientation of the zwitterion headgroups on compression, which are indicated by the surface potentials in the phase transition region, and inclusion of the energy of chain demixing from the oil phase will be required for molecular modeling of the phase transitions.
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Affiliation(s)
- James Mingins
- 119, Stainbank Rd., Kendal, Cumbria, LA9 5BG, England
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7
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Abstract
The investigations, both experimental and theoretical, concerning the sign and the magnitude of the surface potential drop at the water/air interface and across adsorbed films presented in many papers are surveyed.
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Affiliation(s)
- M Paluch
- Department of Physical Chemistry and Electrochemistry, Faculty of Chemistry, Jagiellonian University, Krakow, Poland
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8
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Interfacial properties of mixtures of lecithin with a block copolymer surfactant at the water/air and water/oil interfaces. Colloid Polym Sci 1995. [DOI: 10.1007/bf00656889] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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9
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Furusawa K, Matsumura H. Electrical phenomena at the surfaces of phospholipid membranes caused by the binding of ionic compounds. Colloids Surf A Physicochem Eng Asp 1994. [DOI: 10.1016/0927-7757(94)02830-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Mingins J, Stigter D, Dill KA. Phospholipid interactions in model membrane systems. I. Experiments on monolayers. Biophys J 1992; 61:1603-15. [PMID: 1617140 PMCID: PMC1260454 DOI: 10.1016/s0006-3495(92)81964-1] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
We study the lateral headgroup interactions among phosphatidylcholine (PC) molecules and among phosphatidylethanolamine (PE) molecules in monolayers and extend our previous models. In this paper, we present an extensive set of pressure-area isotherms and surface potential experiments on monolayers of phospholipids ranging from 14 to 22 carbons in length at the n-heptane/water interface, over a wide range of temperature, salt concentration, and pH on the acid side. The pressure data presented here are a considerable extension of previous data (1) to higher surface densities, comprehensively checked for monolayer loss, and include new data on PE molecules. We explore surface densities ranging from extremely low to intermediate, near to the main phase transition, in which range the surface pressures and potentials are found to be independent of the chain length. Thus, these data bear directly on the headgroup interactions. These interactions are observed to be independent of ionic strength. PC and PE molecules differ strongly in two respects: (a) the lateral repulsion among PC molecules is much stronger than for PE, and (b) the lateral repulsion among PC molecules increases strongly with temperature whereas PE interactions are almost independent of temperature. Similarly, the surface potential for PC is found to increase with temperature whereas for PE it does not. In this and the following paper we show that these data from dilute to semidilute monolayers are consistent with a theoretical model that predicts that, independent of coverage, for PC the P-N+ dipole is oriented slightly into the oil phase because of the hydrophobicity of the methyl groups, increasingly so with temperature, whereas for PE the P-N+ dipole is directed into the water phase.
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Affiliation(s)
- J Mingins
- AFRC Institute of Food Research, Norwich Laboratory, United Kingdom
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11
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Makino K, Yamada T, Kimura M, Oka T, Ohshima H, Kondo T. Temperature- and ionic strength-induced conformational changes in the lipid head group region of liposomes as suggested by zeta potential data. Biophys Chem 1991; 41:175-83. [PMID: 1773010 DOI: 10.1016/0301-4622(91)80017-l] [Citation(s) in RCA: 202] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Neutral liposomes composed of DMPC (dimyristoylphosphatidylcholine), DPPC (dipalmitoylphosphatidylcholine) or DSPC (distearoylphosphatidylcholine) are found to exhibit non-zero zeta potentials in an electric field even when they are dispersed in solution at pH 7.4. A model for the orientation of lipid head groups is proposed to explain the observed non-zero zeta potentials. The dependence of the zeta potential on temperature and ionic strength is analyzed via this model to obtain the information on the direction of the lipid head group in the liposome surface region. The direction of the lipid head group is found to be sensitive to the temperature and the ionic strength of the medium. At low ionic strengths, the phosphatidyl groups are located at the outer portion of the head group region. At constant temperature, as the ionic strength increases, the choline group approaches the outer region of the bilayer surface while the phosphatidyl group hides behind the surface. At the phase transition temperature of the lipid, the phosphatidyl group lies in the outer-most region of the surface and the choline group is in the inner-most region.
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Affiliation(s)
- K Makino
- Faculty of Pharmaceutical Sciences, Science University of Tokyo, Japan
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12
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Monolayers of long chain lecithins at the air/water interface and their hydrolysis by phospholipase A2. J Biol Chem 1991. [DOI: 10.1016/s0021-9258(20)64322-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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13
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Electrical properties of adsorbed or spread films: The effective value of permittivities in the Helmholtz equation (plane distribution of point dipoles). J Colloid Interface Sci 1990. [DOI: 10.1016/0021-9797(90)90261-l] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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14
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Matsumura H, Furusawa K. Electrical phenomena at the surface of phospholipid membranes relevant to the sorption of ionic compounds. Adv Colloid Interface Sci 1989; 30:71-109. [PMID: 2665785 DOI: 10.1016/0001-8686(89)80004-1] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The change in electrostatical potential-profile across the phospholipid membranes caused by the binding or sorption of ionic compounds (metal cations, ionic surfactants, lipid-soluble ions, and ionophore-metal complexes) can be estimated by the direct measuring method (combination of zeta potential of lipid vesicles and surface potential of lipid monolayer). The analysis of the data by a simple electrical double layer theory reveals the binding/sorption location of these ions. The coexistent effect of metal ions and lipid-soluble ions on the sorption behavior is described from the interfacial electrochemical view point. The coagulation of lipid vesicles caused by those ionic compounds is also discussed.
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Affiliation(s)
- H Matsumura
- Electrotechnical Laboratory, AIST, Tsukuba-City, Ibaraki, Japan
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16
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Thompson M, Krull U, Bendell-Young L, Lundström I, Nylander C. Local surface dipolar perturbation of lipid membranes by phloretin and its analogues. Anal Chim Acta 1985. [DOI: 10.1016/s0003-2670(00)84950-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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17
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Thompson M, Krull UJ, Bendell-Young LI. 711—Surface aggregate modulation of lipid membrane ion permeability. ACTA ACUST UNITED AC 1984. [DOI: 10.1016/0302-4598(84)87030-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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18
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Lipid membrane dipole perturbation and chemoreception as models for selective chemical sensing. Anal Chim Acta 1983. [DOI: 10.1016/0003-2670(83)80068-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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19
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Thompson M, Krull U. The electroanalytical response of the bilayer lipid membrane to valinomycin: an empirical treatment. Anal Chim Acta 1982. [DOI: 10.1016/s0003-2670(01)95309-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Thompson M, Krull U. The electroanalytical response of the bilayer lipid membrane to valinomycin: membrane cholesterol content. Anal Chim Acta 1982. [DOI: 10.1016/s0003-2670(01)95308-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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21
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Pethica B, Glasser M, Mingins J. Intermolecular forces in monolayers at air/water interfaces. J Colloid Interface Sci 1981. [DOI: 10.1016/0021-9797(81)90299-x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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22
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Pickard WF, Sehgal KC, Jackson CM. Measurement of phospholipid monolayer surface potentials at a hydrocarbon-electrolyte interface. BIOCHIMICA ET BIOPHYSICA ACTA 1979; 552:1-10. [PMID: 435489 DOI: 10.1016/0005-2736(79)90241-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The phospholipid monolayer spread at a hydrocarbon-electrolyte interface can be used as a model system for the plasma membrane and its properties and structure probed by measurements of surface pressure and surface potential. To facilitate such studies, (i) the theory of the vibrating plate (Kelvin) method of measuring surface potentials is reëxamined and a new interpretation given for the potentials measured and (ii) a new apparatus for performing these measurements is described. The theory and apparatus are illustrated by measurements on films of distearoyl phosphatidylcholine at the interface between 2,2,4-trimethylpentane (isooctane) and 0.1 M NaCl.
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