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Structural studies of acidic polymers produced by the O23 reference strain of Serratia marcescens: presence of amide-linked glutamic acid

โœ Scribed by David Oxley; Stephen G. Wilkinson

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
515 KB
Volume
204
Category
Article
ISSN
0008-6215

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โœฆ Synopsis

The major fraction of an acidic galactoglucomannan present in lipopolysaccharide extracts from cell walls of the O23 reference strain of Serratia marcescens has the tetrasaccharide repeating-unit shown. In a minor fraction, L-glutamic acid was amide-linked to about half of the D-glucuronic acid residues. The possible contributions of the acidic polymers and a neutral polymer produced by the organism to cross-reactions with other serogroups are discussed.

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The lipopolysaccharide extract from the cell wall of the reference strain for Serratia marcescens serogroup O18 contained, in addition to a neutral glycan characterised previously, an acidic glycan. Acidity was contributed both by D-glucuronic acid and by 4-O-[(R)-1-carboxyethyl]-D-glucose (4-O-Lac-