Immunochemistry of the Lewis-blood-group system: Proton nuclear magnetic resonance study of plasmatic Lewis-blood-group-active glycosphingolipids and related substances |
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Authors: | Janusz Dabrowski Peter Hanfland Heinz Egge Ursula Dabrowski |
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Affiliation: | 1. Max-Planck-Institut für Medizinische Forschung, D-6900 Heidelberg, West Germany;2. Institut für Experimentelle Hämatologie und Bluttransfusionswesen der Universität Bonn, D-5300 Bonn, West Germany;3. Physiologisch-Chemisches Institut der Universität Bonn, D-5300 Bonn, West Germany |
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Abstract: | The Lea-, Leb-, and H-type 1 (LedH)-blood-group-active glycosphingolipids, as well as H-I-type 2 glycolipid, lactotetraosyl ceramide, and neo-lactotetraosyl ceramide were examined by 1H nuclear magnetic resonance at 360 MHz in dimethyl-d6 sulfoxide as solvent. The resonances of almost all protons of the sugar rings were assigned with the aid of spin decoupling and nuclear Overhauser difference spectroscopy. The latter technique was also applied to establish the sequences and sites of glycosidic linkage. This information, combined with the chemical shift-structure correlations established in our previous work, led to an independent identification of those six glycolipids. Type 1 (Galβ1 → 3GlcNAc) and type 2 (Galβ1 → 4GlcNAc) saccharide chains can be distinguished by this approach. Some deviations from additivity in chemical shifts, calculated for oligosaccharides from the data on their constituent sugar residues, furnished information on the conformational changes in crowded glycolipid molecules. |
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