Conformational properties of l-fucose and the tetrasaccharide building block of the sulfated l-fucan from Lytechinus variegatus.

Autor: Bezerra FF; Institute of Medical Biochemistry Leopoldo de Meis, University Hospital Clementino Fraga Filho, Federal University of Rio de Janeiro, Rio de Janeiro 21941, RJ, Brazil., Vignovich WP; BioMolecular Sciences Department, School of Pharmacy, University of Mississippi, University, 38677 MS, USA., Aderibigbe AO; BioMolecular Sciences Department, School of Pharmacy, University of Mississippi, University, 38677 MS, USA., Liu H; BioMolecular Sciences Department, School of Pharmacy, University of Mississippi, University, 38677 MS, USA., Sharp JS; BioMolecular Sciences Department, School of Pharmacy, University of Mississippi, University, 38677 MS, USA; Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, 38677 MS, USA., Doerksen RJ; BioMolecular Sciences Department, School of Pharmacy, University of Mississippi, University, 38677 MS, USA; Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, 38677 MS, USA., Pomin VH; Institute of Medical Biochemistry Leopoldo de Meis, University Hospital Clementino Fraga Filho, Federal University of Rio de Janeiro, Rio de Janeiro 21941, RJ, Brazil; BioMolecular Sciences Department, School of Pharmacy, University of Mississippi, University, 38677 MS, USA; Research Institute of Pharmaceutical Sciences, School of Pharmacy, University of Mississippi, University, 38677 MS, USA. Electronic address: vpomin@olemiss.edu.
Jazyk: angličtina
Zdroj: Journal of structural biology [J Struct Biol] 2020 Jan 01; Vol. 209 (1), pp. 107407. Date of Electronic Publication: 2019 Nov 04.
DOI: 10.1016/j.jsb.2019.107407
Abstrakt: Although the 3D structure of carbohydrates is known to contribute to their biological roles, conformational studies of sugars are challenging because their chains are flexible in solution and consequently the number of 3D structural restraints is limited. Here, we investigate the conformational properties of the tetrasaccharide building block of the Lytechinus variegatus sulfated fucan composed of the following structure [l-Fucp4(SO 3 - )-α(1-3)-l-Fucp2,4(SO 3 - )-α(1-3)-l-Fucp2(SO 3 - )-α(1-3)-l-Fucp2(SO 3 - )] and the composing monosaccharide unit Fucp, primarily by nuclear magnetic resonance (NMR) experiments performed at very low temperatures and using H 2 O as the solvent for the sugars rather than using the conventional deuterium oxide. By slowing down the fast chemical exchange rates and forcing the protonation of labile sites, we increased the number of through-space 1 H- 1 H distances that could be measured by NMR spectroscopy. Following this strategy, additional conformational details of the tetrasaccharide and l-Fucp in solution were obtained. Computational molecular dynamics was performed to complement and validate the NMR-based measurements. A model of the NMR-restrained 3D structure is offered for the tetrasaccharide.
(Copyright © 2019 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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