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• W2130673759 endingPage "338" @default.
• W2130673759 startingPage "329" @default.
• W2130673759 abstract "Glycosaminoglycan-protein interactions are biologically important and require an appreciation of glycan molecular shape in solution, which is presently unavailable. In previous studies we found strong similarity between aqueous molecular dynamics (MD) simulations and published x-ray diffraction refinements of hyaluronan. We have applied a similar approach here to chondroitin and dermatan, attempting to clarify some of the issues raised by the x-ray diffraction literature relating to chondroitin and dermatan sulfate. We predict that chondroitin has the same beta(1-->4) linkage conformation as hyaluronan, and that their average beta(1-->3) conformations differ. This is explained by changes in hydrogen-bonding across this linkage, resulting from its axial hydroxyl, causing a different sampling of left-handed helices in chondroitin (2.5- to 3.5-fold) as compared with hyaluronan (3.0- to 4.0-fold). Few right-handed helices, which lack intramolecular hydrogen-bonds, were sampled during our MD simulations. Thus, we propose that the 8-fold helix observed in chondroitin-6-sulfate, represented in the literature as an 8(3) helix (right-handed), though it has never been refined, is more likely to be 8(5) (left-handed) helix. Molecular dynamics simulations implied that (4)C(1) and (2)S(O), but not (1)C(4), forms of iduronate could be used in refinements of dermatan x-ray fiber diffraction patterns. Current models of 8-fold dermatan sulfate chains containing (4)C(1) iduronate refine to right-handed helices, which possess no intramolecular hydrogen-bonds. However, MD simulations predict that models containing (2)S(O) iduronate could provide better (8(5) helix) starting structures for refinement. Thus, the 8-fold dermatan sulfate refinement (8(3) helix) could be in error." @default.
• W2130673759 created "2016-06-24" @default.
• W2130673759 creator A5051237597 @default.
• W2130673759 creator A5070614775 @default.
• W2130673759 date "2000-03-01" @default.
• W2130673759 modified "2023-09-25" @default.
• W2130673759 title "Glycosaminoglycan conformation: do aqueous molecular dynamics simulations agree with x-ray fiber diffraction?" @default.
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• W2130673759 doi "https://doi.org/10.1093/glycob/10.3.329" @default.
• W2130673759 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10704532" @default.
• W2130673759 hasPublicationYear "2000" @default.
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