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Bicelles Rich in both Sphingolipids and Cholesterol and Their Use in Studies of Membrane Proteins

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.0c04669· OSTI ID:1675036
 [1];  [2];  [3];  [4];  [4];  [5];  [1];  [6];  [7];  [1];  [6];  [1];  [7];  [1];  [4];  [3];  [8];  [5];  [2];  [1]
  1. Vanderbilt Univ., Nashville, TN (United States)
  2. Univ. of Connecticut, Storrs, CT (United States)
  3. Univ. of Leipzig (Germany)
  4. Univ. of Michigan, Ann Arbor, MI (United States)
  5. Boston Univ., MA (United States)
  6. Kaiser Permanente, Portland, OR (United States)
  7. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  8. Univ. of Alabama, Huntsville, AL (United States)
How the distinctive lipid composition of mammalian plasma membranes impacts membrane protein structure is largely unexplored, partly because of the dearth of isotropic model membrane systems that contain abundant sphingolipids and cholesterol. Here, this gap is addressed by showing that sphingomyelin and cholesterol-rich (SCOR) lipid mixtures with phosphatidylcholine can be cosolubilized by n-dodecyl-β-melibioside to form bicelles. Small-angle X-ray and neutron scattering, as well as cryo-electron microscopy, demonstrate that these assemblies are stable over a wide range of conditions and exhibit the bilayered-disc morphology of ideal bicelles even at low lipid-to-detergent mole ratios. SCOR bicelles are shown to be compatible with a wide array of experimental techniques, as applied to the transmembrane human amyloid precursor C99 protein in this medium. These studies reveal an equilibrium between low-order oligomer structures that differ significantly from previous experimental structures of C99, providing an example of how ordered membranes alter membrane protein structure.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
European Research Council (ERC); German Research Foundation (DFG); National Institute of General Medical Sciences; National Institutes of Health (NIH); National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-00OR22725; SC0012704
OSTI ID:
1675036
Alternate ID(s):
OSTI ID: 1690153
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 29 Vol. 142; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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