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Title: Preparation of asymmetric phospholipid vesicles for use as cell membrane models

Journal Article · · Nature Protocols
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [6];  [3];  [7]
  1. Weill Cornell Medical College, New York, NY (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
  3. Univ. of Graz (Austria)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); East Tennessee State Univ., Johnson City, TN (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Stony Brook Univ., NY (United States)
  7. Univ. of Windsor, ON (Canada)

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.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1561603
Journal Information:
Nature Protocols, Vol. 13, Issue 9; ISSN 1754-2189
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 87 works
Citation information provided by
Web of Science

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Cited By (7)

A protocell with fusion and division journal December 2019
Liposomes as models for membrane integrity journal May 2019
Gramicidin Increases Lipid Flip-Flop in Symmetric and Asymmetric Lipid Vesicles journal March 2019
Solvent-assisted preparation of supported lipid bilayers journal June 2019
Contributions and Limitations of Biophysical Approaches to Study of the Interactions between Amphiphilic Molecules and the Plant Plasma Membrane journal May 2020
The transbilayer distribution of polyunsaturated phospholipids determines their facilitating effect on membrane deformation journal January 2020
Transverse lipid organization dictates bending fluctuations in model plasma membranes journal January 2020

Figures / Tables (4)


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