Polysaccharide

Glycoside

Glycosylation

Escherichia coli

Stereochemistry

Biology

Microbiology

Gene

Catalysis

Hydrogenolysis

Chemistry

Immunology

Shigella

Trisaccharide

Shigella boydii

Lipopolysaccharide

Shigella sonnei

Shigellosis

Shigella flexneri

Biochemistry

Chemistry - An Asian Journal

Protection against bacterial infections, including shigellosis, can be achieved by antibodies against the bacterial surface polysaccharide. In line with our efforts to develop vaccine candidates for shigellosis, we report herein the synthesis of penta-, deca-, and pentadecasaccharides as well as tri-, octa-, and tridecasaccharides as the endchain and intrachain fragments, respectively, of the surface polysaccharide of Shigella flexneri 3 a, a prevalent serotype. The syntheses relied on the efficiency of the trichloroacetimidate glycosylation chemistry, whereby iteration with di- and trisaccharide building blocks provided fragments made of up to three mono-O-acetylated polysaccharide repeating units. Pd(OH)2 -mediated hydrogenation/hydrogenolysis enabled the concomitant removal or conversion of up to 31 protecting groups of 4 different origins to provide the targets as propyl glycosides. Oligosaccharides comprising the octasaccharide segment were shown to display high conformational similarities in solution.

Efficient Iterative Synthesis of O-Acetylated Tri- to Pentadecasaccharides Related to the Lipopolysaccharide of<i>Shigella flexneri</i>Type 3 a through Di- and Trisaccharide Glycosyl Donors

Efficient Iterative Synthesis of O-Acetylated Tri- to Pentadecasaccharides Related to the Lipopolysaccharide ofShigella flexneriType 3 a through Di- and Trisaccharide Glycosyl Donors