Abstract
A sialylated oligosaccharide was identified in four representative strains of the Gram-negative swine pathogen, Actinobacillus suis. As characterized, the glycan consists of a free oligosaccharide with a N-acetyl-lactosamine-like backbone decorated with sialic acid, phosphoethanolamine (PEA) and O-acetyl units: 9-O-Ac-Neu5Ac-(2-->6)-beta-d-Galp-(1-->4)-beta-d-6-O-Ac-GlcpNAc-(1-->3)-[PEA-->6]-beta-d-Galp-(1-->3)-beta-d-GlcpNAc-(1-->2)-[9-O-Ac-Neu5Ac-(2-->6)]-beta-d-Galp-(1-->4)-beta-d-6-O-Ac-GlcpNAc-(1-->3)-[PEA-->6]-beta-d-Galp-(1-->3)-d-GlcpNAc. The ubiquitous expression of this sialylated glycan suggests that this carbohydrate may play an important role in the survival of A. suis in the host.
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