Structural studies of the capsular polysaccharide from Actinobacillus (Haemophilus) pleuropneumoniae serotype 4

Abstract

The capsular polysaccharide of Actinobacillus (Haemophilus pleuropneumoniae serotype 4 (ATCC 33378) is composed of D-glucose (one part), 2-acetamido-2-deoxy-D-galactose (one part), and phosphate (one part). From hydrolysis, dephosphorylation, methylation, and 1H and 13C nuclear magnetic resonance studies, the polysaccharide was found to be a high molecular weight polymer of a repeating disaccharide unit, joined through monophosphate diester linkages and having the following structure:[Formula: see text]