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Zidar J, Merzel F, Hodošček M, Rebolj K, Sepčić K, Maček P, Janežič D. Liquid-Ordered Phase Formation in Cholesterol/Sphingomyelin Bilayers: All-Atom Molecular Dynamics Simulations. J Phys Chem B 2009; 113:15795-802. [DOI: 10.1021/jp907138h] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jernej Zidar
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
| | - Franci Merzel
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
| | - Milan Hodošček
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
| | - Katja Rebolj
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
| | - Kristina Sepčić
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
| | - Peter Maček
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
| | - Dušanka Janežič
- National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia, and Department of Biology, Biotechnical Faculty, University of Ljubljana, Večna pot 111, SI-1000 Ljubljana, Slovenia
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252
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Oreopoulos J, Yip CM. Combinatorial microscopy for the study of protein–membrane interactions in supported lipid bilayers: Order parameter measurements by combined polarized TIRFM/AFM. J Struct Biol 2009; 168:21-36. [DOI: 10.1016/j.jsb.2009.02.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2008] [Revised: 02/23/2009] [Accepted: 02/24/2009] [Indexed: 02/06/2023]
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253
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Pakkanen K, Salonen E, Mäkelä AR, Oker-Blom C, Vattulainen I, Vuento M. Desipramine induces disorder in cholesterol-rich membranes: implications for viral trafficking. Phys Biol 2009; 6:046004. [DOI: 10.1088/1478-3975/6/4/046004] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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254
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Štrancar J, Kavalenka A, Urbančič I, Ljubetič A, Hemminga MA. SDSL-ESR-based protein structure characterization. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2009; 39:499-511. [DOI: 10.1007/s00249-009-0510-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2009] [Accepted: 06/23/2009] [Indexed: 10/20/2022]
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255
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Livanec PW, Dunn RC. Single-molecule probes of lipid membrane structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:14066-73. [PMID: 19053664 PMCID: PMC3544167 DOI: 10.1021/la802886c] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Biological membranes are highly heterogeneous structures that are thought to use this heterogeneity to organize and modify the function of membrane constituents. Probing membrane organization, structure, and changes therein are crucial for linking structural metrics with function in biological membranes. Here we report the use of single-molecule fluorescence studies to measure membrane structure at the molecular level. Several groups have shown that polarized total internal reflection fluorescence microscopy using p-polarized excitation can reveal single-molecule orientations when spherical aberrations are introduced into the optics train. We use this approach to measure the orientation of fluorescent lipid analogs doped into Langmuir-Blodgett films of DPPC and arachidic acid. We compare two commonly used fluorescent lipid analogs, BODIPY-PC and DiIC18, which have their fluorophores located in the tailgroup and headgroup, respectively. We find the tilt orientation of BODIPY-PC is very sensitive to the surface pressure at which DPPC films are transferred onto the substrate. At low surface pressures, the tailgroups are largely lying in the plane of the filmand evolve to an orientation normal to the surface as pressure is increased. For DiIC18, however, no evolution in orientation with surface pressure is observed, which is consistent with the headgroup located fluorophore being less sensitive to changes in membrane packing. Single-molecule orientation measurements of DiIC18 in multilayer films of arachidic acid are also measured and compared with previous bulk measurements. Finally, single-molecule measurements are utilized to reveal the ordering induced in DPPC monolayers following the addition of cholesterol.
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Affiliation(s)
- Philip W. Livanec
- Ralph N. Adams Institute for Bioanalytical Chemistry, University of Kansas, 2030 Becker Drive, Lawrence, KS 66047
| | - Robert C. Dunn
- Ralph N. Adams Institute for Bioanalytical Chemistry, University of Kansas, 2030 Becker Drive, Lawrence, KS 66047
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256
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Ha̧c-Wydro K, Dynarowicz-Ła̧tka P. The Impact of Sterol Structure on the Interactions with Sphingomyelin in Mixed Langmuir Monolayers. J Phys Chem B 2008; 112:11324-32. [DOI: 10.1021/jp803193s] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Katarzyna Ha̧c-Wydro
- Faculty of Chemistry, Jagiellonian University, Ingardena 3, 30-060 Kraków, Poland
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