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Title: Joint small-angle X-ray and neutron scattering data analysis of asymmetric lipid vesicles

Journal Article · · Journal of Applied Crystallography (Online)
 [1];  [2];  [1];  [3];  [4]; ORCiD logo [1]
  1. Univ. of Graz (Austria); BioTechMed-Graz, Graz (Austria)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Univ. of Graz (Austria); BioTechMed-Graz (Austria)
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Low- and high-resolution models describing the internal transbilayer structure of asymmetric lipid vesicles have been developed. These models can be used for the joint analysis of small-angle neutron and X-ray scattering data. The models describe the underlying scattering length density/electron density profiles either in terms of slabs or through the so-called scattering density profile, previously applied to symmetric lipid vesicles. Both models yield structural details of asymmetric membranes, such as the individual area per lipid, and the hydrocarbon thickness of the inner and outer bilayer leaflets. The scattering density profile model, however, comes at a cost of increased computational effort but results in greater structural resolution, showing a slightly lower packing of lipids in the outer bilayer leaflet of ~120 nm diameter palmitoyloleoyl phosphatidylcholine (POPC) vesicles, compared to the inner leaflet. Here, analysis of asymmetric dipalmitoyl phosphatidylcholine/POPC vesicles did not reveal evidence of transbilayer coupling between the inner and outer leaflets at 323 K,i.e.above the melting transition temperature of the two lipids.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1351774
Journal Information:
Journal of Applied Crystallography (Online), Vol. 50, Issue 2; ISSN 1600-5767
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (4)

Complex biomembrane mimetics on the sub-nanometer scale journal July 2017
Preparation of asymmetric phospholipid vesicles for use as cell membrane models journal September 2018
Transverse lipid organization dictates bending fluctuations in model plasma membranes journal January 2020
BILMIX : a new approach to restore the size polydispersity and electron density profiles of lipid bilayers from liposomes using small-angle X-ray scattering data journal February 2020

Figures / Tables (10)