Abstract
The structures of DMPC and DPPC bilayers in unilamellar liposomes, in the presence of 33.3 mol% cholesterol or the plant sterol β-sitosterol, have been studied by small-angle neutron scattering. The bilayer thickness d L increases in a similar way for both sterols. The repeat distance in multilamellar liposomes, as determined by small-angle X-ray diffraction, is larger in the presence of β-sitosterol than in the presence of cholesterol. We observe that each sterol modifies the interlamellar water layer differently, cholesterol reducing its thickness more efficiently than β-sitosterol, and conclude that cholesterol suppresses bilayer undulations more effectively than β-sitosterol.
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Abbreviations
- DLPC:
-
1,2-dilauroyl-sn-glycero-3-phosphatidylcholine
- DMPC:
-
1,2-dimyristoyl-sn-glycero-3-phosphatidylcholine
- DPPC:
-
1,2-dipalmitoyl-sn-glycero-3-phosphatidylcholine
- DSPC:
-
1,2-distearoyl-sn-glycero-3-phosphatidylcholine
- SANS:
-
Small-angle neutron scattering
- SAXD:
-
Small-angle X-ray diffraction
- Chol:
-
Cholesterol
- Sit:
-
β-sitosterol
- TMA-DPH:
-
1-(4-trimethylammonium-phenyl)-6-phenyl-1,3,5-hexatriene
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Acknowledgments
This work was supported by the European Commission through the Access Activities of the Integrated Infrastructure Initiative for Neutron Scattering and Muon Spectroscopy (NMI3), supported by the European Commission under the 6th Framework Programme through the Key Action: Strengthening the European Research Area, Research Infrastructures, contract no.: RII3-CT-2003-505925, by the Dubna JINR 07-04-1069-09/2011 project and by the VEGA 1/0295/08 (PB) and 1/0292/09 (DU) grants. The research leading to these results has received funding from the European Community’s Seventh Framework Programme (FP7/2007-2013) under grant agreement no. 226716 (HASYLAB project I-20080187 EC) to DU.
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Gallová, J., Uhríková, D., Kučerka, N. et al. The effects of cholesterol and β-sitosterol on the structure of saturated diacylphosphatidylcholine bilayers. Eur Biophys J 40, 153–163 (2011). https://doi.org/10.1007/s00249-010-0635-6
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DOI: https://doi.org/10.1007/s00249-010-0635-6