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Experimental Evidence for the Existence of Non-exo-Anomeric Conformations in Branched Oligosaccharides: NMR Analysis of the Structure and Dynamics of Aminoglycosides of the Neomycin Family

AuthorsAsensio, Juan Luis CSIC ORCID; Hidalgo, Ana; Cuesta, Igor; González, Carlos CSIC ; Cañada, F. Javier ; Vicent, Cristina CSIC ORCID; Chiara, José Luis CSIC ORCID ; Cuevas, Gabriel; Jiménez-Barbero, Jesús CSIC ORCID
KeywordsAnomeric effect
Molecular dynamics
Molecular recognition
NMR spectroscopy
Issue DateNov-2002
CitationChemistry - A European Journal 8(22): 5228-5240 (2002)
AbstractIt is commonly known that the exo-anomeric effect is a major factor governing the conformational behavior of naturally occurring oligosaccharides. Conformational flexibility in these molecules mainly concerns the aglycon ψ angle since ϕ is restricted by this stereoelectronic effect. In fact, to the best of our knowledge no case of a natural glycoside adopting a non-exo-anomeric conformation in solution has yet been reported. With respect to the flexibility among naturally occurring carbohydrates, branched type oligosaccharides including sugar residues glycosidated at contiguous positions (such as blood type carbohydrate antigens Lewis X) have been considered as the paradigm of rigid saccharides—the rigidity being enhanced by van der Waals interactions. Herein, we demonstrate unambiguously that both common beliefs are not to be generalized. For example in neomycin B, a branched oligosaccharide antibiotic, a large number of non-exo-anomeric conformations was detected in solution for the first time in naturally occurring sugars. This unusual behavior is attributed to branching. Here, polar contacts between non-vicinal sugar units lead to an enhanced flexibility of the ribose glycosidic torsion ϕ. The influence of sugar flexibility on RNA recognition will also be discussed.
Description13 páginas, 14 figuras, 2 tablas.-- Supporting information for this article (Figures showing details of the NMR analysis n and ribostamycin) is available on the WWW under or from the author.
Publisher version (URL)<5228::AID-CHEM5228>3.0.CO;2-L
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