Abstract:
:An iduronic acid-containing trisaccharide, methyl-O-(4-O-methyl-2,3,6-tri-O-sulfo-alpha-D-glucopyranosyl-(1-->4)-O- (2-O-sulfo-alpha-L-idopyranosyluronic acid)-(1-->4)-O-2,6-di-O-sulfo-alpha-D-glucopyranoside, related to antithrombotic heparin fragments has been subjected to a combined NMR and molecular modeling investigation. The conformational behavior of the two constituting disaccharide segments was investigated using a systematic grid search approach with the MM3 force field along with the proper parameters for the sulfate ester group. The exploration of the potential energy surfaces of the trisaccharide was performed through the use of the CICADA methods interfaced with the MM3 force field. In all cases, the 2-O-sulfo-alpha-L-iduronate moiety was given the three favored ring conformations (1)C4, (4)C1, and (2)S0. Conformations were clustered into families, four of which are likely to exhibit significant occupancy in solution. The different low-energy conformational families display different orientations at the glycosidic linkages and/or different ring shapes for the iduronate ring. The (2)S0 conformation is the major one for the 2-O-sulfo-alpha-L-iduronate but is still in equilibrium with the (1)C4 ring shape. The occurrence of such a conformational equilibrium in solution was probed via high-resolution NMR spectroscopy through measurements of coupling constants and NOE build-up. These results are in keeping with the observation that 2-O-sulfated pentasaccharides display a similar affinity for antithrombin III as their 2-N-sulfated counterparts.
journal_name
Bioorg Med Chemjournal_title
Bioorganic & medicinal chemistryauthors
Cros S,Petitou M,Sizun P,Pérez S,Imberty Adoi
10.1016/s0968-0896(97)00087-4subject
Has Abstractpub_date
1997-07-01 00:00:00pages
1301-9issue
7eissn
0968-0896issn
1464-3391pii
S0968089697000874journal_volume
5pub_type
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