The effect of vitamin E on the structure of membrane lipid assemblies
The effects of vitamin E on the activity of membrane-dependent enzymes suggest that it acts indirectly by modifying some properties of the lipid host. The effects of α-tocopherol (α-T) and α-tocopherol hemisuccinate (α-THS) on phospholipid monolayer structure, curvature, and bending elasticity were...
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doaj-c401e68eedbd48adbeaf58302fc5cf3d2021-04-27T04:45:53ZengElsevierJournal of Lipid Research0022-22752003-10-01441019401945The effect of vitamin E on the structure of membrane lipid assembliesA. Bradford0J. Atkinson1N. Fuller2R.P. Rand3Departments of Biological Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1; Chemistry, Brock University, St. Catharines, Ontario, Canada L2S 3A1Departments of Biological Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1; Chemistry, Brock University, St. Catharines, Ontario, Canada L2S 3A1Departments of Biological Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1; Chemistry, Brock University, St. Catharines, Ontario, Canada L2S 3A1Departments of Biological Sciences, Brock University, St. Catharines, Ontario, Canada L2S 3A1; Chemistry, Brock University, St. Catharines, Ontario, Canada L2S 3A1The effects of vitamin E on the activity of membrane-dependent enzymes suggest that it acts indirectly by modifying some properties of the lipid host. The effects of α-tocopherol (α-T) and α-tocopherol hemisuccinate (α-THS) on phospholipid monolayer structure, curvature, and bending elasticity were examined using X-ray diffraction and the osmotic stress method. These ligands were mixed with the hexagonal phase-forming lipid, dioleoylphosphatidylethanolamine (DOPE). Increasing levels up to 50 mol% α-T in DOPE in excess water result in a systematic decrease in the lattice dimension. Analysis of the structural changes imposed by α-T shows that it contributes a spontaneous radius of curvature of −13.7 Å. This unusually negative value is comparable to diacylglycerols. α-T does not affect the bending elasticity of these monolayers. α-THS in its charged form decreases membrane curvature, but in its undissociated neutral form has a qualitatively similar but reduced effect on monolayer curvature, as does α-T.We discuss these results in terms of the local stresses such ligands would produce in the vicinity of a membrane protein, and how one might expect proteins to respond to such stress.http://www.sciencedirect.com/science/article/pii/S0022227520337111α-tocopherolspontaneous curvaturedioleoylphosphatidylethanolamineα-tocopherol hemisuccinate |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. Bradford J. Atkinson N. Fuller R.P. Rand |
spellingShingle |
A. Bradford J. Atkinson N. Fuller R.P. Rand The effect of vitamin E on the structure of membrane lipid assemblies Journal of Lipid Research α-tocopherol spontaneous curvature dioleoylphosphatidylethanolamine α-tocopherol hemisuccinate |
author_facet |
A. Bradford J. Atkinson N. Fuller R.P. Rand |
author_sort |
A. Bradford |
title |
The effect of vitamin E on the structure of membrane lipid assemblies |
title_short |
The effect of vitamin E on the structure of membrane lipid assemblies |
title_full |
The effect of vitamin E on the structure of membrane lipid assemblies |
title_fullStr |
The effect of vitamin E on the structure of membrane lipid assemblies |
title_full_unstemmed |
The effect of vitamin E on the structure of membrane lipid assemblies |
title_sort |
effect of vitamin e on the structure of membrane lipid assemblies |
publisher |
Elsevier |
series |
Journal of Lipid Research |
issn |
0022-2275 |
publishDate |
2003-10-01 |
description |
The effects of vitamin E on the activity of membrane-dependent enzymes suggest that it acts indirectly by modifying some properties of the lipid host. The effects of α-tocopherol (α-T) and α-tocopherol hemisuccinate (α-THS) on phospholipid monolayer structure, curvature, and bending elasticity were examined using X-ray diffraction and the osmotic stress method. These ligands were mixed with the hexagonal phase-forming lipid, dioleoylphosphatidylethanolamine (DOPE). Increasing levels up to 50 mol% α-T in DOPE in excess water result in a systematic decrease in the lattice dimension. Analysis of the structural changes imposed by α-T shows that it contributes a spontaneous radius of curvature of −13.7 Å. This unusually negative value is comparable to diacylglycerols. α-T does not affect the bending elasticity of these monolayers. α-THS in its charged form decreases membrane curvature, but in its undissociated neutral form has a qualitatively similar but reduced effect on monolayer curvature, as does α-T.We discuss these results in terms of the local stresses such ligands would produce in the vicinity of a membrane protein, and how one might expect proteins to respond to such stress. |
topic |
α-tocopherol spontaneous curvature dioleoylphosphatidylethanolamine α-tocopherol hemisuccinate |
url |
http://www.sciencedirect.com/science/article/pii/S0022227520337111 |
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