PolysacDB O-polysaccharide 2323
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Revision as of 06:13, 8 April 2010
Carbohydrate Name
O-polysaccharide
Carbohydrate Class
O-polysaccharide [LPS]
Source Microbe
Shigella flexneri
Basic Structure
Chemically, the O-antigen is a polysaccharide chain of variable length, built up by repetitive sequences of tetra- to hexasaccharides. It consists of a basic tetrasaccharide repeating unit consisting of three rhamnoses and one N-acetylglucosamine was common to all S. flexneri strains (except serotype 17): -2)-α-L-Rhap-(1-->2)-α-L-Rhap-(1-->3)-α-L-Rhap-(1-->3)-β-D-GlcpNAc-(1-->
Proposed functions
N/A
Antigenic Nature used to produce antibodies
Heat killed cells
Carrier Name
nil
Conjugation Method
nil
Antibodies
Antisera
Antibody type and class
N/A
Assay System
ELISA
Cross-reactivity
The highest titers seen were against serotype 3a and 3b LPSs
Proposed epitopes
In S. flexneri serotype 3a and 3b LPSs there is no structural feature to which the type III antigen epitope can be assigned. Instead, the serotype specificity is a consequence of the addition of two group antigen epitopes to the basic structure in serotype 3a (7,8 and 6 epitopes) and of one group antigen epitope to the basic structure in serotype 3b (6 epitope). The α-D-glucose-(1-->3)-α-L-rhamnose was assigned as the determinant for group 7,8 antigen, and the 2-O-acetyl-α-L-rhamnose III structure was assigned as the determinant for group 6 antigen
Proposed Utility
N/A
