Biotinylated oligo-α-(1→4)-D-galactosamines and their N-acetylated derivatives: α-stereoselective synthesis and immunology application.

Biotinylated oligo-α-(1→4)-D-galactosamines and their N-acetylated derivatives: α-stereoselective synthesis and immunology application.

J Am Chem Soc. 2020 Jan 08;:

Authors: Kazakova ED, Yashunsky DV, Krylov VB, Bouchara JP, Cornet M, Valsecchi I, Fontaine T, Latge JP, Nifantiev NE

Abstract
Using 3-O-benzoyl-4,6-O-di-tert-butylsilylidene-2-azido-2-deoxy-selenogalactoside, biotinylated oligo-α-(1→4)-D-galactosamines comprising from 2 to 6 GalN units were prepared for the first time together with their N-acetylated derivatives. The combination of blocking groups used herein provided stereocontrol for the α-stereospecific glycosylation, to show also high efficiency of phenyl 2-azido-2-deoxy-selenogalactosides as glycosyl donors. The obtained glycoconjugates are related to fragments of exopolysaccharide galac-tosaminogalactan (GG) found in Aspergillus fumigatus, which is the most important airborne human fungal pathogen in industrialized countries. The synthesized glycoconjugates were arrayed on streptavi-din-coated plates and used to investigate the GG epitopes recognized by mouse monoclonal antibodies against GG and by human antibodies in the sera of patients with aspergillosis. The obtained data showed that the oligo-α-(1→4)-D-galactosamines and their N-acetylated derivatives allowed the first precise analysis of the specificity of the antibody responses to this extremely complex fungal polysaccharide.

PMID: 31913631 [PubMed – as supplied by publisher]

Source: Industry