Synthesis of β(1,3) oligoglucans exhibiting a Dectin-1 binding affinity and their biological evaluation

Bioorganic & Medicinal Chemistry
Hiroshi TanakaTakashi Takahashi

Abstract

In this report, we describe the synthesis and biological evaluation of β(1,3) oligosaccharides that contain an aminoalkyl group and their biological evaluation. A 2,3 diol glycoside with a 4,6 benzylidene protecting group was used as an effective glycosyl acceptor for the synthesis of some β(1,3) linked glycosides. The use of a combination of a linear tetrasaccharide and a branched pentasaccharide as glycosyl donors led to the preparation of β(1,3) linear octa- to hexadecasaccharides and branched nona- to heptadecasaccharides in good total yields. Measurements of the competitive effects of the oligosaccharides on the binding of a soluble form of Dectin-1 to a solid-supported Schizophyllan (SPG) revealed that the branched heptadecasaccharide and the linear hexadecasaccharides also have binding activity for Dectin-1. In addition, the two oligosaccharides, both of which contain a β(1,3) hexadecasaccharide backbone, exhibited agonist activity in a luciferase-assisted NF-κB assay. STD-NMR analyses of complexes of Dectin-1 and the linear hexadecasaccharides clearly indicate Dectin-1 specifically recognizes the sugar part of the oligosaccharides and not the aminoalkyl chain.

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