Structural insights in galectin-1-glycan recognition : relevance of the glycosidic linkage and the N-acetylation pattern of sugar moieties

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Título

Structural insights in galectin-1-glycan recognition : relevance of the glycosidic linkage and the N-acetylation pattern of sugar moieties

Tema

INHIBIDORES
PROTEINAS
SINTESIS ENZIMATICA
GLUCIDOS
MODELADO MOLECULAR
BIBLIOGRAFIA NACIONAL QUIMICA
2021

Abstract

Galectins, soluble lectins widely expressed intra- and extracellularly in different cell types, play major roles in
deciphering the cellular glycocode. Galectin-1 (Gal-1), a prototype member of this family, presents a carbohydrate
recognition domain (CRD) with specific affinity for β-galactosides such as N-acetyllactosamine (β-D-Galp-(1
→ 4)-D-GlcpNAc), and mediate numerous physiological and pathological processes.
In this work, Gal-1 binding affinity for β-(1 → 6) galactosides, including β-D-Galp-(1 → 6)-β-D-GlcpNAc-(1 → 4)-
D-GlcpNAc was evaluated, and their performance was compared to that of β-(1 → 4) and β-(1 → 3) galactosides.
To this end, the trisaccharide β-D-Galp-(1 → 6)-β-D-GlcpNAc-(1 → 4)-D-GlcpNAc was enzymatically synthesized, purified and structurally characterized.
To evaluate the affinity of Gal-1 for the galactosides, competitive solid phase assays (SPA) and isothermal titration calorimetry (ITC) studies were carried out. The experimental dissociation constants and binding energies obtained were compared to those calculated by molecular docking. These analyses evidenced the critical role of the glycosidic linkage between the terminal galactopyranoside residue and the adjacent monosaccharide, as galactosides bearing β-(1 → 6) glycosidic linkages showed dissociation constants six- and seven-fold higher than those involving β-(1 → 4) and β-(1 → 3) linkages, respectively. Moreover, docking experiments revealed the presence of hydrogen bond interactions between the N-acetyl group of the glucosaminopyranose moiety of the evaluated galactosides and specific amino acid residues of Gal 1, relevant for galectin-glycan affinity. Noticeably, the binding free energies (ΔGcbainlcd) derived from the molecular docking were in good agreement with experimental values determined by ITC measurements (ΔGebxinpd), evidencing a good correlation between theoretical and experimental approaches, which validates the in silico simulations and constitutes an important tool for the rational design of future optimized ligands.

Fuente

Bioorganic and Medicinal Chemistry, v. 44, 2021. -- e116309

Editor

Elsevier

Fecha

2021

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PDF

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Inglés

Tipo

Artículo

Identificador

10.1016/j.bmc.2021.116309

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Original Format

PDF
Fecha de agregación
December 27, 2021
Colección
Bibliografía Nacional Química
Tipo de Elemento
Document
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Citación
Porciúncula González, Cecilia, “Structural insights in galectin-1-glycan recognition :relevance of the glycosidic linkage and the N-acetylation pattern of sugar moieties,” RIQUIM - Repositorio Institucional de la Facultad de Química - UdelaR, accessed May 21, 2022, http://riquim.fq.edu.uy/items/show/6462.
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