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• W2093765302 abstract "A simple protocol employing lipid transfer proteins was developed to label human low density lipoprotein (LDL) in a controlled manner with parinaroyl and pyrenyl phosphatidylcholines. In order to study the lipid fluidity in the surface lipid layer of LDL, the temperature-dependence of both polarization (parinaroyl probes) and excimer to monomer (E/M) intensity ratio (pyrenyl probes) were analyzed. A series of pyrenyl phosphatidylcholines containing a pyrenyl fatty acid varying from 6 to 14 carbons in length at the sn-2 position were inserted into LDL to investigate the lateral distribution of different phosphatidylcholines in the lipoprotein surface at 37 degrees C. Both polarization and E/M vs. temperature plots displayed discontinuities in the region of 22-32 degrees C, which coincides with the melting of the neutral lipid core, indicating that the latter induces an ordered to more disordered phase transition in the surface lipid layer. Determination of the E/M intensity ratio as a function of pyrene lipid concentration in LDL showed a linear relationship for the pyrenyl hexanoate and octanoate species, whereas a slope discontinuity was observed for the lipids containing a longer pyrenyl chain. These data suggest that two lipid domains with distinct properties exist in the surface layer and secondly, pyrenyl lipids partition between these domains in a chainlength-dependent manner. This is consistent with measurement of the tryptophan to pyrene energy transfer efficiency vs. pyrenyl lipid concentration, which showed a biphasic relationship for the long-chain pyrenyl lipids. These measurements further indicate that two surface lipid domains correspond to the protein-lipid boundary and the bulk lipid phase, respectively. The fact that relatively small changes in chainlength have a marked influence on the partitioning of pyrenyl lipids between the boundary and the bulk phase suggests also that native phospholipid species may not be randomly distributed in the surface lipid layer of LDL." @default.
• W2093765302 created "2016-06-24" @default.
• W2093765302 creator A5038150416 @default.
• W2093765302 creator A5039498150 @default.
• W2093765302 date "1989-08-01" @default.
• W2093765302 modified "2023-09-24" @default.
• W2093765302 title "Parinaroyl and pyrenyl phospholipids as probes for the lipid surface layer of human low density lipoproteins" @default.
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• W2093765302 doi "https://doi.org/10.1016/0005-2736(89)90345-3" @default.
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