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Structure of the capsular K3 antigen of Escherichia coli 04:K3:H4, a polysaccharide containing a 4-deoxy-2-hexulosonic acid

✍ Scribed by Thomas Dengler; Karl Himmelspach; Barbara Jann; Klaus Jann

Publisher: Elsevier Science
Year: 1988
Tongue: English
Weight: 697 KB
Volume: 178
Category: Article
ISSN: 0008-6215
DOI: 10.1016/0008-6215(88)80111-3

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✦ Synopsis

The K3-antigenic capsular polysaccharide (K3 antigen) of Escherichia coli contains L-rhamnose, a 4-deoxy-2-hexulosonic acid, and an O-acetyl group in the molar ratio of 3:1:1. The backbone consists of a ----2)-O-alpha-L-rhamnopyranosyl-(1----3)-O-alpha-L-rhamnopyranosyl-(1----3)-O-alpha-L-rhamnopyranosyl-(1---- repeating unit. Either one of the 3-linked L-rhamnopyranosyl residues of each repeating unit may be substituted at O-2 with a 4-deoxy-2-hexulosonic acid, an isomer of the furanosyl form of KDO, about 90% of which is acetylated at 0-6. The 4-deoxy-2-hexulosonic acid residue is linked to the L-rhamnan backbone in a very labile linkage which is split by 1% acetic acid (30 min, 100 degrees). The K3 polysaccharide has a molecular weight of approximately 38,000, corresponding to approximately 60 repeating units.

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