Orientation and flexibility of the choline head group in phosphatidylcholine bilayers

Seelig, J. and Gally, G. U. and Wohlgemuth, R.. (1977) Orientation and flexibility of the choline head group in phosphatidylcholine bilayers. Biochimica et biophysica acta, Vol. 467, H. 2. pp. 109-119.

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Official URL: http://edoc.unibas.ch/dok/A5257548

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The average orientation and flexibility of the phosphorylcholine group are deduced from deuterium and phosphorus-31 nuclear magnetic resonance measurements of unsonicated phosphatidylcholine bilayers in the liquid crystalline state. The experimental data are consistent with a model in which the polar head group exhibits a restricted flexibility characterized by rapid transitions between two enantiomeric conformations. A completely flexible or a completely rigid head group structure can be excluded. The phosphorylcholine residue is found to be bent at the position of the phosphate group, due to a gauche-gauche conformation of the phosphodiester linkage. The choline dipole is aligned parallel to the plane of the membrane, which is in agreement with X-ray and neutron diffraction studies. The average orientation of the phosphorylcholine group is therfore the same as that of the phosphorylethanolamine head group.
Faculties and Departments:05 Faculty of Science > Departement Biozentrum > Former Organization Units Biozentrum > Biophysical Chemistry (Seelig J)
UniBasel Contributors:Seelig, Joachim
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
Last Modified:22 Mar 2012 14:20
Deposited On:22 Mar 2012 13:18

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