Journal
CHEMISTRY AND PHYSICS OF LIPIDS
Volume 131, Issue 1, Pages 107-121Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.chemphyslip.2004.04.007
Keywords
liposomes; NMR; alpha-tocopherol; tocopheroxyl radical; ubiquinol; ubiquinone; vitamin C; lipid bilayer; membranes
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We have previously shown that the location and orientation of compounds intercalated within the lipid bilayer can be qualitatively determined using an NMR chemical shift-polarity correlation. We describe herein the results of our application of this method to analogs of Vitamin E, ubiquinol and ubiquinone. The results indicate that tocopherol-and presumably the corresponding tocopheroxyl radical-reside adjacent to the interface, and can, therefore, abstract a hydrogen atom from ascorbic acid. On the other hand, the decaprenyl substituted ubiquinol and ubiquinone lie substantially deeper within the lipid membrane. Yet, contrary to the prevailing literature, their location is far from being the same. Ubiquinone-10 is situated above the long-chain fatty acid slab. Ubiquinol-10 dwells well within the lipid slab, presumably out of striking range of Vitamin C. Nevertheless, ubiquinol can act as an antioxidant by reducing C- or O-centered lipid radicals or by recycling the lipid-resident tocopheroxyl radical. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
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