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Conformational analysis of sialyloligosaccharides
S Sabesan1, K Bock, J C Paulson
1Du Pont, Central Research and Development, Wilmington, DE 19880-0328.
Carbohydrate Research
|September 30, 1991
Summary
This study analyzed sialyloligosaccharide conformations using NMR data. Alpha-(2-3) sialosides show deeper energy wells than alpha-(2-6) sialosides, indicating more stable structures in solution.
Area of Science:
- Carbohydrate Chemistry
- Structural Biology
- Biophysics
Background:
- Sialyloligosaccharides are crucial terminal structures in glycoproteins.
- Understanding their conformation is key to their biological function.
Purpose of the Study:
- To analyze the conformational properties of various sialyloligosaccharides.
- To compare the conformational preferences of alpha-(2-6) and alpha-(2-3) sialyl linkages.
Main Methods:
- Nuclear Magnetic Resonance (NMR) spectroscopy on selected sialosides.
- Deuteration of sialosides for enhanced NMR analysis.
- Hard-Sphere Exoanomeric (HSEA) effect calculations for conformational modeling.
Main Results:
- NMR data and HSEA calculations revealed distinct conformational landscapes for alpha-(2-6) and alpha-(2-3) sialyl linkages.
- Alpha-(2-3) sialosides exhibited deeper potential energy wells, suggesting more defined conformations.
- Alpha-(2-6) sialosides displayed shallower energy wells, indicating a broader distribution of conformers.
Conclusions:
- The conformational flexibility of sialyloligosaccharides varies significantly between alpha-(2-6) and alpha-(2-3) linkages.
- These conformational differences likely impact the biological recognition and function of glycoproteins.