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- W2045497415 abstract "For confirmation of some general aspects of phospholipid conformation in membranes and extension of previous neutron diffraction studies on dipalmitoyllecithin, measurements have now been made on 1,2-dipalmitoyl-sn-glycero-3-phosphoethanolamine (DPPE) in the gel phase by the same method. Three selectively deuterated samples were investigated; in one of the specimens the first methylene segment close to the glycerol backbone in both chains was deuterated, and in the other two samples one of the methylene segments in the phosphoethanolamine group was replaced by CD2. Together with the undeuterated DPPE, these probes were investigated at very low water content (about 1.5--2 molecules of water per lipid) as oriented samples at 25 degrees C. The intensities of the first 12 reflections were collected and phased, and the mean positions of the segments were determined. The results confirm the idea that the conformation of a DPPE molecule in the gel state is very similar to the crystal structure of rac-1,2-dilauroyl-sn-glycero-3-phosphoethanolamine. The two main features are (1) the chains remain in all all-trans conformation having an axial displacement of about 3--4 A, (2) the zwitterionic dipoles in the head groups of both compounds are found to be aligned almost parallel to the bilayer surface. The main advantage of the method results in the fact that the combination of neutron scattering with selectively deuterated probes allows the determination of the mean label position to an accuracy of up to +/- 1 A." @default.
- W2045497415 created "2016-06-24" @default.
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- W2045497415 date "1980-12-01" @default.
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- W2045497415 title "Conformation of phosphatidylethanolamine in the gel phase as seen by neutron diffraction" @default.
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- W2045497415 doi "https://doi.org/10.1021/bi00567a034" @default.
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