Structural characterization of the antigenic O-polysaccharide in the lipopolysaccharide produced by Actinobacillus pleuropneumoniae serotype 14

The antigenic O-polysaccharide of the lipopolysaccharide produced by Actinobacillus pleuropneumoniae serotype 14 was shown by chemical analysis and 1D and 2D nuclear magnetic resonance methods to be a high-molecular-mass polymer of a repeating disaccharide unit composed of a chain of (1 → 5)-linked β-d-galactofuranose (β-d-Galf) residues substituted at their O-2 positions by α-d-galactopyranose residues (d-Galp) (1:1):