Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7784008 | Carbohydrate Polymers | 2018 | 36 Pages |
Abstract
Alginate oligosaccharides (AOS) with a weight average molecular weight of 5â¯kDa were efficiently amidated with amino acids and carbohydrates in aqueous media in the presence of 4-(4,6-dimethoxy-1,3,5-triazin-2-yl)-4-methylmorpholinium chloride (DMTMM). Here, alanine, leucine, serine, as well as mannose and rhamnose, were amidated at high yields with a good control of the degree of substitution (DS). Amino acid- and carbohydrate-grafted AOS showed improved stability against degradation by alginate lyases having different specificities. This enzyme resistance was correlated with the DS: hydrolysis was reduced by 60-70% for low DS (0.1), whereas AOS with DS ranging from 0.4 to 0.6 remained unhydrolyzed. Competitive inhibition assays demonstrated multivalent binding of mannose-amidated AOS to concanavalin A lectin. A 178-fold affinity enhancement was observed for AOSMan-0.38 (DS 0.38) over α-methyl-mannoside with an IC50 of 5.6â¯Î¼M, lending further evidence for the promising potential of AOS as multivalent scaffolds.
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Authors
Flavien Labre, Sophie Mathieu, Patricia Chaud, Pierre-Yves Morvan, Romuald Vallée, William Helbert, Sébastien Fort,