Preparation of asymmetric phospholipid vesicles for use as cell membrane models
Abstract
Freely suspended liposomes are widely used as model membranes for studying lipid–lipid and protein–lipid interactions. Liposomes prepared by conventional methods have chemically identical bilayer leaflets. By contrast, living cells actively maintain different lipid compositions in the two leaflets of the plasma membrane, resulting in asymmetric membrane properties that are critical for normal cell function. Here, we present a protocol for the preparation of unilamellar asymmetric phospholipid vesicles that better mimic biological membranes. Asymmetry is generated by methyl-β-cyclodextrin-catalyzed exchange of the outer leaflet lipids between vesicle pools of differing lipid composition. Lipid destined for the outer leaflet of the asymmetric vesicles is provided by heavy-donor multilamellar vesicles containing a dense sucrose core. Donor lipid is exchanged into extruded unilamellar acceptor vesicles that lack the sucrose core, facilitating the post-exchange separation of the donor and acceptor pools by centrifugation because of differences in vesicle size and density. We present two complementary assays allowing quantification of each leaflet’s lipid composition: the overall lipid composition is determined by gas chromatography–mass spectrometry, whereas the lipid distribution between the two leaflets is determined by NMR, using the lanthanide shift reagent Pr3+. The preparation protocol and the chromatographic assay can be applied to any type of phospholipidmore »
- Authors:
-
- Weill Cornell Medical College, New York, NY (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Univ. of Graz (Austria)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); East Tennessee State Univ., Johnson City, TN (United States)
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Stony Brook Univ., NY (United States)
- Univ. of Windsor, ON (Canada)
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
- OSTI Identifier:
- 1561603
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Protocols
- Additional Journal Information:
- Journal Volume: 13; Journal Issue: 9; Journal ID: ISSN 1754-2189
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Doktorova, Milka, Heberle, Frederick A., Eicher, Barbara, Standaert, Robert F., Katsaras, John, London, Erwin, Pabst, Georg, and Marquardt, Drew. Preparation of asymmetric phospholipid vesicles for use as cell membrane models. United States: N. p., 2018.
Web. doi:10.1038/s41596-018-0033-6.
Doktorova, Milka, Heberle, Frederick A., Eicher, Barbara, Standaert, Robert F., Katsaras, John, London, Erwin, Pabst, Georg, & Marquardt, Drew. Preparation of asymmetric phospholipid vesicles for use as cell membrane models. United States. https://doi.org/10.1038/s41596-018-0033-6
Doktorova, Milka, Heberle, Frederick A., Eicher, Barbara, Standaert, Robert F., Katsaras, John, London, Erwin, Pabst, Georg, and Marquardt, Drew. Thu .
"Preparation of asymmetric phospholipid vesicles for use as cell membrane models". United States. https://doi.org/10.1038/s41596-018-0033-6. https://www.osti.gov/servlets/purl/1561603.
@article{osti_1561603,
title = {Preparation of asymmetric phospholipid vesicles for use as cell membrane models},
author = {Doktorova, Milka and Heberle, Frederick A. and Eicher, Barbara and Standaert, Robert F. and Katsaras, John and London, Erwin and Pabst, Georg and Marquardt, Drew},
abstractNote = {Freely suspended liposomes are widely used as model membranes for studying lipid–lipid and protein–lipid interactions. Liposomes prepared by conventional methods have chemically identical bilayer leaflets. By contrast, living cells actively maintain different lipid compositions in the two leaflets of the plasma membrane, resulting in asymmetric membrane properties that are critical for normal cell function. Here, we present a protocol for the preparation of unilamellar asymmetric phospholipid vesicles that better mimic biological membranes. Asymmetry is generated by methyl-β-cyclodextrin-catalyzed exchange of the outer leaflet lipids between vesicle pools of differing lipid composition. Lipid destined for the outer leaflet of the asymmetric vesicles is provided by heavy-donor multilamellar vesicles containing a dense sucrose core. Donor lipid is exchanged into extruded unilamellar acceptor vesicles that lack the sucrose core, facilitating the post-exchange separation of the donor and acceptor pools by centrifugation because of differences in vesicle size and density. We present two complementary assays allowing quantification of each leaflet’s lipid composition: the overall lipid composition is determined by gas chromatography–mass spectrometry, whereas the lipid distribution between the two leaflets is determined by NMR, using the lanthanide shift reagent Pr3+. The preparation protocol and the chromatographic assay can be applied to any type of phospholipid bilayer, whereas the NMR assay is specific to lipids with choline-containing headgroups, such as phosphatidylcholine and sphingomyelin. In ~12 h, the protocol can produce a large yield of asymmetric vesicles (up to 20 mg) suitable for a wide range of biophysical studies.},
doi = {10.1038/s41596-018-0033-6},
journal = {Nature Protocols},
number = 9,
volume = 13,
place = {United States},
year = {Thu Sep 06 00:00:00 EDT 2018},
month = {Thu Sep 06 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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