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Current Medicinal Chemistry


ISSN (Print): 0929-8673
ISSN (Online): 1875-533X

Review Article

Conformational and Structural Characterization of Carbohydrates and their Interactions Studied by NMR

Author(s): Francisco Javier Cañada*, Ángeles Canales, Pablo Valverde, Beatriz Fernández de Toro, Mónica Martínez-Orts, Paola Oquist Phillips and Amaia Pereda

Volume 29, Issue 7, 2022

Published on: 05 July, 2021

Page: [1147 - 1172] Pages: 26

DOI: 10.2174/0929867328666210705154046

Price: $65


Carbohydrates, either free or as glycans conjugated with other biomolecules, participate in a plethora of essential biological processes. Their apparent simplicity in terms of chemical functionality hides an extraordinary diversity and structural complexity. Deeply deciphering at the atomic level their structures is essential to understand their biological function and activities, but it is still a challenging task in need of complementary approaches and no generalized procedures are available to address the study of such complex, natural glycans. The versatility of Nuclear Magnetic Resonance spectroscopy (NMR) often makes it the preferred choice to study glycans and carbohydrates in solution media. The most basic NMR parameters, namely chemical shifts, coupling constants, and nuclear Overhauser effects, allow defining short or repetitive chain sequences and characterize their structures and local geometries either in the free state or when interacting with other biomolecules, rendering additional information on the molecular recognition processes. The increased accessibility to carbohydrate molecules extensively or selectively labeled with 13C is boosting the resolution and detail which analyzed glycan structures can reach. In turn, structural information derived from NMR complemented with molecular modeling and theoretical calculations can also provide dynamic information on the conformational flexibility of carbohydrate structures. Furthermore, using partially oriented media or paramagnetic perturbations, it has been possible to introduce additional longrange observables rendering structural information on longer and branched glycan chains. In this review, we provide examples of these studies and an overview of the recent and most relevant NMR applications in the glycobiology field.

Keywords: Carbohydrates, glycans, NMR, structure, conformational analysis, molecular recognition.

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