Acyl-chain correlation in membrane fusion intermediates: x-ray diffraction from the rhombohedral lipid phase |
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Authors: | Britta Weinhausen Sebastian Aeffner Tobias Reusch Tim Salditt |
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Institution: | Institut für Röntgenphysik, Georg-August-Universität Göttingen, Göttingen, Germany |
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Abstract: | We have studied the acyl-chain conformation in stalk phases of model membranes by x-ray diffraction from oriented samples. As an equilibrium lipid phase induced by dehydration, the stalk or rhombohedral phase exhibits lipidic passages (stalks) between adjacent bilayers, representing a presumed intermediate state in membrane fusion. From the detailed analysis of the acyl-chain correlation peak, we deduce the structural parameters of the acyl-chain fluid above, at, and below the transition from the lamellar to rhombohedral state, at the molecular level. |
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