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Multiantennary group-specific polysaccharide of group B Streptococcus
F Michon1, J R Brisson, A Dell
1Division of Biological Sciences, National Research Council of Canada, Ottawa, Ontario.
Biochemistry
|July 12, 1988
Summary
The group B Streptococcus antigen features a complex, branched structure composed of four unique oligosaccharide units. These units, linked by phosphodiester bonds, exhibit an ordered biosynthesis and arrangement, contributing to the antigen's multiantennary structure.
Area of Science:
- Microbiology
- Carbohydrate Chemistry
- Structural Biology
Background:
- Group B Streptococcus (GBS) antigen is a critical virulence factor.
- The GBS antigen's complex structure influences host-pathogen interactions.
- Understanding GBS antigen structure is key to developing effective vaccines and therapeutics.
Purpose of the Study:
- To elucidate the detailed structure and arrangement of the oligosaccharide units within the GBS antigen.
- To identify the specific roles of different oligosaccharide components in the antigen's overall architecture.
- To investigate the ordered biosynthesis of the GBS antigen.
Main Methods:
- Chemical and enzymatic sequencing studies were employed.
- Structural elucidation of oligosaccharide units II and III.
- Analysis of phosphodiester linkages between oligosaccharides.
Main Results:
- The GBS antigen comprises four distinct oligosaccharides (I, II, III, IV) with varying sugar compositions.
- Oligosaccharides are linked via phosphodiester bonds, forming a highly branched, multiantennary structure.
- Specific oligosaccharides (III and IV) are located at termini, suggesting roles in antigen anchoring and biosynthesis regulation.
Conclusions:
- The GBS antigen possesses a unique, highly branched multiantennary structure.
- The arrangement of oligosaccharides indicates an ordered biosynthetic pathway.
- Oligosaccharide IV likely acts as a linker between the polysaccharide and the bacterial cell wall.