Target intelligence / Profile preview

Shigella flexneri 2a O-antigen (S. flexneri 2a O-antigen)

Target
S. flexneri 2a O-antigen
Molecular classification
Polysaccharide, Lipopolysaccharide component, Antigen
01

Overview

The Shigella flexneri 2a O-antigen is a serotype-specific polysaccharide component of the lipopolysaccharide (LPS) on the outer membrane of S. flexneri serotype 2a, a major cause of bacillary dysentery. The O-antigen is critical for bacterial virulence, immune evasion, and serospecificity. It is a branched pentasaccharide composed of rhamnose, N-acetylglucosamine, and glucose, variably modified by glucosylation and O-acetylation. Chain length, regulated by Wzz proteins, affects motility and complement resistance. The O-antigen is a target for protective antibodies and a basis for conjugate vaccine development.

Other names
S. flexneri serotype 2a O-antigenShigella flexneri 2a LPS O-antigenO-antigen S. flexneri 2aGroup B O-antigen
02

Mechanism of action

N/A

03

Biological functions

Serospecificity determinationImmune evasionBacterial virulenceCell adhesionOuter membrane stabilization
04

Disease associations

Bacillary dysenteryShigellosisInfection
05

Safety considerations

Potential for immune escape through O-antigen modificationChallenge of developing broadly protective vaccines due to serotype diversity

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