Dimyristoyl Phosphatidylcholine: A Remarkable Exception to Tocopherol s Membrane Presence

Journal Article · Wed Jan 01 00:00:00 EST 2014 · Journal of the American Chemical Society

DOI:https://doi.org/10.1021/ja408288f· OSTI ID:1114285

Marquardt, Drew ^[1]; Williams, Justin ^[2]; Kinnun, Justin A. ^[2]; Kucerka, Norbert ^[3]; Atkinson, Jeffrey ^[1]; Wassall, Stephen ^[2]; Katsaras, John ^[4]; Harroun, Thad ^[1]

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1. Brock University, St. Catharines, ON, Canada
2. Indiana University and Purdue University
3. Atomic Energy of Canada Limited (AECL), Canadian Neutron Beam Centre (CNBC) and Comenius University,
4. ORNL

Using data obtained from different physical techniques (i.e., neutron diffraction, NMR and UV spectroscopy), we present evidence which explains some of the conflicting and inexplicable data found in the literature regarding -tocopherol s (aToc s) behavior in dimyristoyl phosphatidylcholine (di-14:0PC) bilayers. Without exception, the data point to aToc s active chromanol moiety residing deep in the hydrophobic core of di-14:0PC bilayers, a location that is in stark contrast to aToc s location in other PC bilayers. Our result is a clear example of the importance of lipid species diversity in biological membranes and importantly, it suggests that measurements of aToc s oxidation kinetics, and its associated byproducts observed in di-14:0PC bilayers, should be reexamined, this time taking into account its noncanonical location in this bilayer.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1114285
• Journal Information: Journal of the American Chemical Society, Vol. 136, Issue 1; ISSN 0002--7863
• Country of Publication: United States
• Language: English