4,6-O-(1-Carboxyethylidene)-D-mannose as a Structural Unit in Capsular Polysaccharide of Klebsiella K-type 5

Abstract

Methylation, periodate oxidation, and partial hydrolysis techniques have each been used to demonstrate the presence of 4,6-O-(1-carboxyethylidene)-D-mannopyranosyl units in the capsular polysaccharide of Klebsiella K-type 5. The structure of this polysaccharide differs from those known for other Klebsiella capsules by the lack of any carbohydrate side chain. A repeating unit of[Formula: see text](plus one unassigned O-acetyl group) is in accord with the experimental data.