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Iriarte-Alonso MA, Bittner AM, Chiantia S. Influenza A virus hemagglutinin prevents extensive membrane damage upon dehydration. BBA ADVANCES 2022; 2:100048. [PMID: 37082591 PMCID: PMC10074934 DOI: 10.1016/j.bbadva.2022.100048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
Abstract
While the molecular mechanisms of virus infectivity are rather well known, the detailed consequences of environmental factors on virus biophysical properties are poorly understood. Seasonal influenza outbreaks are usually connected to the low winter temperature, but also to the low relative air humidity. Indeed, transmission rates increase in cold regions during winter. While low temperature must slow degradation processes, the role of low humidity is not clear. We studied the effect of relative humidity on a model of Influenza A H1N1 virus envelope, a supported lipid bilayer containing the surface glycoprotein hemagglutinin (HA), which is present in the viral envelope in very high density. For complete cycles of hydration, dehydration and rehydration, we evaluate the membrane properties in terms of structure and dynamics, which we assess by combining confocal fluorescence microscopy, raster image correlation spectroscopy, line-scan fluorescence correlation spectroscopy and atomic force microscopy. Our findings indicate that the presence of HA prevents macroscopic membrane damage after dehydration. Without HA, fast membrane disruption is followed by irreversible loss of lipid and protein mobility. Although our model is principally limited by the membrane composition, the macroscopic effects of HA under dehydration stress reveal new insights on the stability of the virus at low relative humidity.
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Jackman JA, Yorulmaz Avsar S, Ferhan AR, Li D, Park JH, Zhdanov VP, Cho NJ. Quantitative Profiling of Nanoscale Liposome Deformation by a Localized Surface Plasmon Resonance Sensor. Anal Chem 2016; 89:1102-1109. [PMID: 27983791 DOI: 10.1021/acs.analchem.6b02532] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Characterizing the shape of sub-100 nm, biological soft-matter particulates (e.g., liposomes and exosomes) adsorbed at a solid-liquid interface remains a challenging task. Here, we introduce a localized surface plasmon resonance (LSPR) sensing approach to quantitatively profile the deformation of nanoscale, fluid-phase 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) liposomes contacting a titanium dioxide substrate. Experimental and theoretical results validate that, due to its high sensitivity to the spatial proximity of phospholipid molecules near the sensor surface, the LSPR sensor can discriminate fine differences in the extent of ionic strength-modulated liposome deformation at both low and high surface coverages. By contrast, quartz crystal microbalance-dissipation (QCM-D) measurements performed with equivalent samples were qualitatively sensitive to liposome deformation only at saturation coverage. Control experiments with stiffer, gel-phase 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) liposomes verified that the LSPR measurement discrimination arises from the extent of liposome deformation, while the QCM-D measurements yield a more complex response that is also sensitive to the motion of adsorbed liposomes and coupled solvent along with lateral interactions between liposomes. Collectively, our findings demonstrate the unique measurement capabilities of LSPR sensors in the area of biological surface science, including competitive advantages for probing the shape properties of adsorbed, nanoscale biological particulates.
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Affiliation(s)
- Joshua A Jackman
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Saziye Yorulmaz Avsar
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Abdul Rahim Ferhan
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Danlin Li
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Jae Hyeon Park
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore
| | - Vladimir P Zhdanov
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore.,Boreskov Institute of Catalysis, Russian Academy of Sciences , Novosibirsk 630090, Russia
| | - Nam-Joon Cho
- School of Materials Science and Engineering and Centre for Biomimetic Sensor Science, Nanyang Technological University , 50 Nanyang Drive, 637553, Singapore.,School of Chemical and Biomedical Engineering, Nanyang Technological University , 62 Nanyang Drive, 637459, Singapore
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Jing Y, Trefna H, Persson M, Kasemo B, Svedhem S. Formation of supported lipid bilayers on silica: relation to lipid phase transition temperature and liposome size. SOFT MATTER 2014; 10:187-195. [PMID: 24651504 DOI: 10.1039/c3sm50947h] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
DPPC liposomes ranging from 90 nm to 160 nm in diameter were prepared and used for studies of the formation of supported lipid membranes on silica (SiO2) at temperatures below and above the gel to liquid-crystalline phase transition temperature (Tm = 41 °C), and by applying temperature gradients through Tm. The main method was the quartz crystal microbalance with dissipation (QCM-D) technique. It was found that liposomes smaller than 100 nm spontaneously rupture on the silica surface when deposited at a temperature above Tm and at a critical surface coverage, following a well-established pathway. In contrast, DPPC liposomes larger than 160 nm do not rupture on the surface when adsorbed at 22 °C or at 50 °C. However, when liposomes of this size are first adsorbed at 22 °C and at a high enough surface coverage, after which they are subject to a constant temperature gradient up to 50 °C, they rupture and fuse to a bilayer, a process that is initiated around Tm. The results are discussed and interpreted considering a combination of effects derived from liposome-surface and liposome-liposome interactions, different softness/stiffness and shape of liposomes below and above Tm, the dynamics and thermal activation of the bilayers occurring around Tm and (for liposomes containing 33% of NaCl) osmotic pressure. These findings are valuable both for preparation of supported lipid bilayer cell membrane mimics and for designing temperature-responsive material coatings.
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Affiliation(s)
- Yujia Jing
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden.
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Andrecka J, Spillane KM, Ortega-Arroyo J, Kukura P. Direct observation and control of supported lipid bilayer formation with interferometric scattering microscopy. ACS NANO 2013; 7:10662-70. [PMID: 24251388 DOI: 10.1021/nn403367c] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Supported lipid bilayers (SLB) are frequently used to study processes associated with or mediated by lipid membranes. The mechanism by which SLBs form is a matter of debate, largely due to the experimental difficulty associated with observing the adsorption and rupture of individual vesicles. Here, we used interferometric scattering microscopy (iSCAT) to directly visualize membrane formation from nanoscopic vesicles in real time. We observed a number of previously proposed phenomena such as vesicle adsorption, rupture, movement, and a wave-like bilayer spreading. By varying the vesicle size and the lipid-surface interaction strength, we rationalized and tuned the relative contributions of these phenomena to bilayer formation. Our results support a model where the interplay between bilayer edge tension and the overall interaction energy with the surface determine the mechanism of SLB formation. The unique combination of sensitivity, speed, and label-free imaging capability of iSCAT provides exciting prospects not only for investigations of SLB formation, but also for studies of assembly and disassembly processes on the nanoscale with previously unattainable accuracy and sensitivity.
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Affiliation(s)
- Joanna Andrecka
- Physical and Theoretical Chemistry Laboratory, Department of Chemistry, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom
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Hardy GJ, Nayak R, Alam SM, Shapter JG, Heinrich F, Zauscher S. Biomimetic supported lipid bilayers with high cholesterol content formed by α-helical peptide-induced vesicle fusion. JOURNAL OF MATERIALS CHEMISTRY 2012; 22:19506-19513. [PMID: 23914075 PMCID: PMC3728912 DOI: 10.1039/c2jm32016a] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study, we present a technique to create a complex, high cholesterol-containing supported lipid bilayers (SLBs) using α-helical (AH) peptide-induced vesicle fusion. Vesicles consisting of POPC : POPE : POPS : SM : Chol (9.35 : 19.25 : 8.25 : 18.15 : 45.00) were used to form a SLB that models the native composition of the human immunodeficiency virus-1 (HIV-1) lipid envelope. In the absence of AH peptides, these biomimetic vesicles fail to form a complete SLB. We verified and characterized AH peptide-induced vesicle fusion by quartz crystal microbalance with dissipation monitoring, neutron reflectivity, and atomic force microscopy. Successful SLB formation entailed a characteristic frequency shift of -35.4 ± 2.0 Hz and a change in dissipation energy of 1.91 ± 0.52 × 10-6. Neutron reflectivity measurements determined the SLB thickness to be 49.9 +1.9-1.5 Å, and showed the SLB to be 100 +0.0-0.1% complete and void of residual AH peptide after washing. Atomic force microscopy imaging confirmed complete SLB formation and revealed three distinct domains with no visible defects. This vesicle fusion technique gives researchers access to a complex SLB composition with high cholesterol content and thus the ability to better recapitulate the native HIV-1 lipid membrane.
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Affiliation(s)
- Gregory J. Hardy
- Mechanical Engineering and Materials Science, Duke University, Durham, NC, USA 27708
| | - Rahul Nayak
- Mechanical Engineering and Materials Science, Duke University, Durham, NC, USA 27708
| | - S. Munir Alam
- Human Vaccine Institute, Department of Medicine, Duke University School of Medicine, Durham, North Carolina 27710
| | - Joseph G. Shapter
- Flinders Centre for Nanoscale Science and Technology, School of Chemical and Physical Sciences, Flinders University, GPO Box 2100, Adelaide, SA, 5001, Australia
| | - Frank Heinrich
- Department of Physics, Carnegie Mellon University, Pittsburgh PA 15213-3890
- NIST Center for Neutron Research, Gaithersburg MD 20899-6102
| | - Stefan Zauscher
- Mechanical Engineering and Materials Science, Duke University, Durham, NC, USA 27708
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Wang X, Shindel MM, Wang SW, Ragan R. Elucidating driving forces for liposome rupture: external perturbations and chemical affinity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:7417-7427. [PMID: 22509939 DOI: 10.1021/la300127m] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Atomic force microscopy (AFM) studies under aqueous buffer probed the role of chemical affinity between liposomes, consisting of large unilamellar vesicles, and substrate surfaces in driving vesicle rupture and tethered lipid bilayer membrane (tLBM) formation on Au surfaces. 1,2-Distearoyl-sn-glycero-3-phosphoethanolamine-N-poly(ethylene glycol)-2000-N-[3-(2-pyridyldithio) propionate] (DSPE-PEG-PDP) was added to 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC) vesicles to promote interactions via Au-thiolate bond formation. Forces induced by an AFM tip leading to vesicle rupture on Au were quantified as a function of DSPE-PEG-PDP composition with and without osmotic pressure. The critical forces needed to initiate rupture of vesicles with 2.5, 5, and 10 mol % DSPE-PEG-PDP are approximately 1.1, 0.8, and 0.5 nN, respectively. The critical force needed for tLBM formation decreases from 1.1 nN (without osmotic pressure) to 0.6 nN (with an osmotic pressure due to 5 mM of CaCl(2)) for vesicles having 2.5 mol % DSPE-PEG-PDP. Forces as high as 5 nN did not lead to LBM formation from pure POPC vesicles on Au. DSPE-PEG-PDP appears to be important to anchor and deform vesicles on Au surfaces. This study demonstrates how functional lipids can be used to tune vesicle-surface interactions and elucidates the role of vesicle-substrate interactions in vesicle rupture.
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Affiliation(s)
- Xi Wang
- Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697-2575, USA
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Curschellas C, Keller R, Berger R, Rietzler U, Fell D, Butt HJ, Limbach HJ. Scanning force microscopy as a tool to investigate the properties of polyglycerol ester foams. J Colloid Interface Sci 2012; 374:164-75. [DOI: 10.1016/j.jcis.2012.01.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2011] [Revised: 01/10/2012] [Accepted: 01/14/2012] [Indexed: 10/14/2022]
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8
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Claesson M, Frost R, Svedhem S, Andersson M. Pore spanning lipid bilayers on mesoporous silica having varying pore size. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8974-8982. [PMID: 21650458 DOI: 10.1021/la201411b] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Synthetic lipid bilayers have similar properties as cell membranes and have been shown to be of great use in the development of novel biomimicry devices. In this study, lipid bilayer formation on mesoporous silica of varying pore size, 2, 4, and 6 nm, has been investigated using quartz crystal microbalance with dissipation monitoring (QCM-D), fluorescent recovery after photo bleaching (FRAP), and atomic force microscopy (AFM). The results show that pore-spanning lipid bilayers were successfully formed regardless of pore size. However, the mechanism of the bilayer formation was dependent on the pore size, and lower surface coverages of adsorbed lipid vesicles were required on the surface having the smallest pores. A similar trend was observed for the lateral diffusion coefficient (D) of fluorescently labeled lipid molecules in the membrane, which was lowest on the surface having the smallest pores and increased with the pore size. All of the pore size dependent observations are suggested to be due to the hydrophilicity of the surface, which decreases with increased pore size.
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Affiliation(s)
- Maria Claesson
- Department of Chemical and Biological Engineering, Chalmers University of Technology, Göteborg, Sweden
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9
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Simulations of lipid vesicle rupture induced by an adjacent supported lipid bilayer patch. Colloids Surf B Biointerfaces 2011; 82:632-6. [DOI: 10.1016/j.colsurfb.2010.09.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2010] [Accepted: 09/09/2010] [Indexed: 11/21/2022]
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10
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Park CW, Lee HJ, Yang HM, Woo MA, Park HG, Kim JD. Size and morphology controllable core cross-linked self-aggregates from poly(ethylene glycol-b-succinimide) copolymers. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24441] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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11
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Dimitrievski K. Deformation of adsorbed lipid vesicles as a function of vesicle size. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:3008-3011. [PMID: 20104868 DOI: 10.1021/la904743d] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Experimental indications that adsorbed lipid vesicles are deformed on the surface (e.g., on SiO(2)) and that the deformation seems to be more pronounced for larger vesicles have been reported. In general, it has been assumed that larger vesicles should show a stronger tendency for spontaneous rupture, which is also backed up by thermodynamic considerations (Seifert, U.; Lipowsky, R. Phys. Rev. A 1990, 42, 4768; Seifert, U. Adv. Phys. 1997, 46, 13). However, using a newly developed model of a lipid bilayer, simulations were performed to study the shape of adsorbed lipid vesicles for different vesicle sizes, with the observation that larger vesicles indeed are more deformed on the surface, but that there is no additional tendency for larger vesicles to rupture spontaneously. It is shown here that the radius of curvature, on the portions of the vesicle membrane that are most strained, is practically independent of the vesicle size. A kinetic barrier for vesicle rupture is proposed to be the reason for the observed disagreement with thermodynamic theory.
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Affiliation(s)
- Kristian Dimitrievski
- Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden.
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Dimitrievski K, Kasemo B. Simulations of lipid transfer between a supported lipid bilayer and adsorbing vesicles. Colloids Surf B Biointerfaces 2009; 75:454-65. [PMID: 19815394 DOI: 10.1016/j.colsurfb.2009.09.019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2009] [Revised: 09/16/2009] [Accepted: 09/16/2009] [Indexed: 11/29/2022]
Abstract
Recent experiments demonstrate transfer of lipid molecules between a charged, supported lipid membrane (SLB) and vesicles of opposite charge when the latter adsorb on the SLB. A simple phenomenological bead model has been developed to simulate this process. Beads were defined to be of three types, 'n', 'p', and '0', representing POPS (negatively charged), POEPC (positively charged), and POPC (neutral but zwitterionic) lipids, respectively. Phenomenological bead-bead interaction potentials and lipid transfer rate constants were used to account for the overall interaction and transfer kinetics. Using different bead mixtures in both the adsorbing vesicle and in the SLB (representing differently composed/charged vesicles and SLBs as in the reported experiments), we clarify under which circumstances a vesicle adsorbs to the SLB, and whether it, after lipid transfer and changed composition of the SLB and vesicle, desorbs back to the bulk again or not. With this model we can reproduce and provide a conceptual picture for the experimental findings.
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Affiliation(s)
- Kristian Dimitrievski
- Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden.
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13
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Dimitrievski K, Kasemo B. Influence of lipid vesicle composition and surface charge density on vesicle adsorption events: a kinetic phase diagram. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:8865-8869. [PMID: 19719212 DOI: 10.1021/la9025409] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Lipid vesicle adsorption on a solid surface, from a bulk liquid solution, results in different final situations on the surface depending on the vesicles' composition, properties of the solution (pH, ion types, and concentration), and surface properties. The main alternative outcomes of the adsorption event are (i) a lipid bilayer with vesicle rupture immediately upon the adsorption event or (ii) bilayer formation only at and after a critical vesicle coverage, (iii) adsorption of intact vesicles, or (iv) repulsion (no adsorption). We have simulated these different events for the case of vesicles consisting of pure neutral (zwitterionic) lipids and mixtures of neutral and positive or negative lipids, keeping the bulk conditions fixed, and have compiled the different resulting lipid structures on the surface as a function of vesicle composition and surface charge density, in a kinetic phase diagram.
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Affiliation(s)
- Kristian Dimitrievski
- Department of Applied Physics, Chalmers University of Technology, S-412 96 Göteborg, Sweden.
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Klacar S, Dimitrievski K, Kasemo B. Influence of surface pinning points on diffusion of adsorbed lipid vesicles. J Phys Chem B 2009; 113:5681-5. [PMID: 19348442 DOI: 10.1021/jp810874h] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using a simple model of a vesicle and a substrate, we have studied the surface diffusion of an adsorbed vesicle. We show that the experimentally observed but unexplained fact, that a neutral (POPC) vesicle adsorbed to a SiO(2) or mica surface does not diffuse but can be moved laterally by an atomic force microscope (AFM) tip, without rupture, can be explained by transient (i.e., temporary) pinning of lipid head groups to surface charges. We studied the surface diffusion for different vesicle adsorption strengths (without any pinning taking place), with the observation that a stronger vesicle-surface attraction leads to slower surface diffusion. However, the surface diffusion was still significant and too high to explain the experimentally observed immobility. When allowing transient lipid pinning between the vesicle and the surface, a 1-2 orders of magnitude decrease in the surface diffusion coefficient was observed. For a lipid adsorption potential of around 20 k(B)T and a lipid pinning potential of about 25 k(B)T, the vesicle is found to be practically immobile on the surface.
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Tranvouez E, Orieux A, Boer-Duchemin E, Devillers CH, Huc V, Comtet G, Dujardin G. Manipulation of cadmium selenide nanorods with an atomic force microscope. NANOTECHNOLOGY 2009; 20:165304. [PMID: 19420569 DOI: 10.1088/0957-4484/20/16/165304] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We have used an atomic force microscope (AFM) to manipulate and study ligand-capped cadmium selenide nanorods deposited on highly oriented pyrolitic graphite (HOPG). The AFM tip was used to manipulate (i.e., translate and rotate) the nanorods by applying a force perpendicular to the nanorod axis. The manipulation result was shown to depend on the point of impact of the AFM tip with the nanorod and whether the nanorod had been manipulated previously. Forces applied parallel to the nanorod axis, however, did not give rise to manipulation. These results are interpreted by considering the atomic-scale interactions of the HOPG substrate with the organic ligands surrounding the nanorods. The vertical deflection of the cantilever was recorded during manipulation and was combined with a model in order to estimate the value of the horizontal force between the tip and nanorod during manipulation. This horizontal force is estimated to be on the order of a few tens of nN.
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Affiliation(s)
- E Tranvouez
- Laboratoire de Photophysique Moléculaire, Université Paris-Sud, 91405 Orsay, France
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Reimhult E, Kasemo B, Höök F. Rupture pathway of phosphatidylcholine liposomes on silicon dioxide. Int J Mol Sci 2009; 10:1683-1696. [PMID: 19468333 PMCID: PMC2680641 DOI: 10.3390/ijms10041683] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/03/2009] [Accepted: 04/10/2009] [Indexed: 11/17/2022] Open
Abstract
We have investigated the pathway by which unilamellar POPC liposomes upon adsorption undergo rupture and form a supported lipid bilayer (SLB) on a SiO(2) surface. Biotinylated lipids were selectively incorporated in the outer monolayer of POPC liposomes to create liposomes with asymmetric lipid compositions in the outer and inner leaflets. The specific binding of neutravidin and anti-biotin to SLBs formed by liposome fusion, prior to and after equilibrated flip-flop between the upper and lower monolayers in the SLB, were then investigated. It was concluded that the lipids in the outer monolayer of the vesicle predominantly end up on the SLB side facing the SiO(2) substrate, as demonstrated by having maximum 30-40% of lipids in the liposome outer monolayer orienting towards the bulk after forming the SLB.
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Affiliation(s)
- Erik Reimhult
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; E-Mails:
(B.K.);
(F.H.)
- Laboratory for Surface Science and Technology, Department of Materials, Swiss Federal Institute of Technology Zurich (ETH Zurich), CH-8093 Zurich, Switzerland
| | - Bengt Kasemo
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; E-Mails:
(B.K.);
(F.H.)
| | - Fredrik Höök
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; E-Mails:
(B.K.);
(F.H.)
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Houga C, Giermanska J, Lecommandoux S, Borsali R, Taton D, Gnanou Y, Le Meins JF. Micelles and polymersomes obtained by self-assembly of dextran and polystyrene based block copolymers. Biomacromolecules 2009; 10:32-40. [PMID: 19072234 DOI: 10.1021/bm800778n] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The self-assembly of dextran-block-polystyrene (dex-b-PS) block copolymers was investigated in solution. The hydrophobic PS weight fraction in these block copolymers ranges from 7 to 92% w/w, whereas the average number molar mass of dextran was kept constant at 6600 gmol(-1). Self-assembly by direct dissolution in water could be performed only for block copolymers with a low hydrophobic content (7% w/w), whereas mixtures of tetrahydrofuran and dimethylsulfoxide were required for higher PS content, before transferring the structures into water. Core-shell micelles, ovoïds, and vesicles could be identified upon characterization by light and neutrons scattering, atomic force microscopy, and transmission electron microscopy. Most of the morphologies observed were not expected considering the chemical composition of the block copolymers. Finally, the size and shape of these nanoparticles were fixed upon cross-linking the dextran block through reaction of the hydroxyl groups with divinylsulfone. The role of the dextran conformation on the self-assembly process is discussed.
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Affiliation(s)
- Clément Houga
- Université de Bordeaux, Laboratoire de Chimie des Polymères Organiques UMR5629, ENSCPB-CNRS, 16 avenue Pey Berland, 33607, Pessac cedex, France
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18
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Goksu EI, Vanegas JM, Blanchette CD, Lin WC, Longo ML. AFM for structure and dynamics of biomembranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2009; 1788:254-66. [DOI: 10.1016/j.bbamem.2008.08.021] [Citation(s) in RCA: 112] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2008] [Revised: 08/26/2008] [Accepted: 08/31/2008] [Indexed: 12/17/2022]
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Edvardsson M, Svedhem S, Wang G, Richter R, Rodahl M, Kasemo B. QCM-D and Reflectometry Instrument: Applications to Supported Lipid Structures and Their Biomolecular Interactions. Anal Chem 2008; 81:349-61. [DOI: 10.1021/ac801523w] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Malin Edvardsson
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Sofia Svedhem
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Guoliang Wang
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Ralf Richter
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Michael Rodahl
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
| | - Bengt Kasemo
- Department of Applied Physics, Chalmers University of Technology, SE-412 96 Göteborg, Sweden, Q-Sense AB, Hängpilsgatan 7, SE-426 77 Västra Frölunda, Sweden, and Biosurfaces Unit, CIC biomaGUNE, Paseo Miramon 182, 20009 San Sebastian, Spain
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Rojas E, Gallego M, Reviakine I. Effect of Sample Heterogeneity on the Interpretation of Quartz Crystal Microbalance Data: Impurity Effects. Anal Chem 2008; 80:8982-90. [DOI: 10.1021/ac8012829] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elena Rojas
- Centro de Investigación Cooperativa en Biomateriales, Parque Tecnológico de San Sebastián, E-20009 San Sebastián, Spain
| | - Marta Gallego
- Centro de Investigación Cooperativa en Biomateriales, Parque Tecnológico de San Sebastián, E-20009 San Sebastián, Spain
| | - Ilya Reviakine
- Centro de Investigación Cooperativa en Biomateriales, Parque Tecnológico de San Sebastián, E-20009 San Sebastián, Spain
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21
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Wikström A, Svedhem S, Sivignon M, Kasemo B. Real-Time QCM-D Monitoring of Electrostatically Driven Lipid Transfer between Two Lipid Bilayer Membranes. J Phys Chem B 2008; 112:14069-74. [DOI: 10.1021/jp803938v] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Angelica Wikström
- Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
| | - Sofia Svedhem
- Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
| | - Marc Sivignon
- Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
| | - Bengt Kasemo
- Department of Applied Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden
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Fortunelli A, Monti S. Simulations of lipid adsorption on TiO2 surfaces in solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10145-10154. [PMID: 18712891 DOI: 10.1021/la801787s] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Molecular dynamics simulations are carried out to study the adsorption of three lipids, namely, DOPC, DOPS, and DMTAP, on TiO2(110) rutile surfaces and the influence of the interface on their conformational properties. Three types of rutile (110) surfaces, characterized by a different degree of hydroxylation (the neutral nonhydroxylated and hydroxylated surfaces and a partially hydroxylated surface with charge density corresponding to physiological pH) are investigated using force fields derived from ab initio calculations and experimental data. It is found that the stability of the adsorbate and the strength of the attachment are strictly connected with the nature of both the lipid and the surface. Direct coordination of the phosphate or carbonyl oxygens of the lipids with available titanium sites, observed in the case of partially or nonhydroxylated layers, determines stronger adsorption and, as a consequence, reduced dynamics. For a given hydration state of the surface, the adsorption strengths are in the order DOPS > DOPC >> DMTAP, in agreement with experimental data according to which the presence of DOPS units inside lipid bilayers favors stronger adsorption and lower mobility. The adsorption geometry, the hydration state of the lipid headgroups, and the dynamical processes (detachment, diffusion, etc.) occurring at the lipid/oxide interface are analyzed in detail, putting on a roughly quantitative basis time scales and energy barriers of the latter processes.
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Affiliation(s)
- Alessandro Fortunelli
- Molecular Modeling Laboratory, Istituto per i Processi Chimico-Fisici of the Italian Consiglio Nazionale delle Ricerche (IPCF-CNR), via G. Moruzzi 1, Pisa, Italy
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23
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Surface supported bilayer platform for studies of lateral association of proteins in membranes (Mini Review). Biointerphases 2008; 3:FA80. [DOI: 10.1116/1.2912096] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Zhdanov VP, Edvardsson M, Höök F, Kasemo B. Suppression of binding events via external perturbation with emphasis on QCM. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.04.030] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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