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Enzymatic synthesis of non-natural trisaccharides and galactosides; Insights of their interaction with galectins as a function of their structure.
Universidad de la Republica, URY.
Consejo Nacional de Investigaciones Científicas y Técnicas, ARG.
Consejo Nacional de Investigaciones Científicas y Técnicas, ARG.
Universidad de la Republica, URY.
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2019 (English)In: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 472, p. 1-15, article id S0008-6215(18)30495-6Article in journal (Refereed) Published
Abstract [en]

Galectins are a family of carbohydrate-recognizing proteins that by interacting with specific glycoepitopes can mediate important biological processes, including immune cell homeostasis and activation of tolerogenic circuits. Among the different members of this family, Galectin 1 and 3 have shown pro-tumorigenic effects, being overexpressed in numerous neoplasic diseases, proving to be relevant in tumor immune escape, tumor progression and resistance to drug-induced apoptosis. Thus, generation of specific glycosides that could inhibit their pro-tumorigenic ability by blocking their carbohydrate recognition domain is one of the current major challenges in the field. Considering that galectin-ligand binding strength is closely related to the ligand structure, analysis of this relationship provides valuable information for rational design of high-affinity ligands that could work as effective galectin inhibitors. Taking profit of the ability of glycosidases to catalyze transglycosylation reactions we achieved the enzymatic synthesis of β-d-Galp-(1 → 6)-β-d-Galp-(1 → 4)-d-Glcp(2), a mixture of β-d-Galp-(1 → 6)-β-d-Glcp-(1 → 4)-d-Glcp(5) and β-d-Galp-(1 → 3)-β-d-Glcp-(1 → 4)-d-Glcp(6), and finally benzyl β-d-galactopyranoside (9), with reaction yields between 16 and 27%. All the galactosides were purified, and characterized using 1H and 13C nuclear magnetic resonance spectroscopy. Docking results performed between the synthesized compounds and human Galectin 1 (hGal-1) and human Galectin 3 (hGal-3) showed that the replacement of a glucose moiety linked to the terminal galactose with a galactose moiety, decreases the affinity for these galectins. Moreover, regarding the interglycosidic bond the most favorable β-Gal linkage seems to be β(1 → 4) followed by β(1 → 3) and β(1 → 6) for hGal-1, and β(1 → 4) followed by β(1 → 6) and β(1 → 3) for hGal-3. These results were in accordance with the IC50 values obtained with in vitro solid phase inhibition assays. Therefore, docking results obtained in this work proved to be a very good approximation for predicting binding affinity of novel galactosides.

Place, publisher, year, edition, pages
Elsevier, 2019. Vol. 472, p. 1-15, article id S0008-6215(18)30495-6
Keywords [en]
Enzymatic synthesis, Galectin inhibitors, Galectins, Molecular modeling, Oligosaccharides, β-galactosidase
National Category
Biochemistry and Molecular Biology
Research subject
Chemistry - Biochemistry
Identifiers
URN: urn:nbn:se:kau:diva-80227DOI: 10.1016/j.carres.2018.10.011ISI: 000455623300001PubMedID: 30428394OAI: oai:DiVA.org:kau-80227DiVA, id: diva2:1468254
Available from: 2020-09-17 Created: 2020-09-17 Last updated: 2022-05-18Bibliographically approved

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Saenz Mendez, Patricia

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