Taxonomic group: bacteria / Firmicutes
(Phylum: Firmicutes)
Host organism: Homo sapiens; Sus scrofa
Associated disease: meningitis [ICD11:
1D01 
];
septicemia [ICD11:
MA15.Y ];
infection due to Streptococcus suis [ICD11:
XN5SE ]
NCBI PubMed ID: 35211512Publication DOI: 10.3389/fmolb.2022.830854Journal NLM ID: 101653173Publisher: Lausanne: Frontiers Media S.A.
Correspondence: mkuttel
cs.uct.ac.za
Institutions: Department of Computer Science, University of Cape Town, Cape Town, South Africa
Streptococcus suis is an encapsulated, commensal, potentially pathogenic bacterium that infects swine globally and causes sporadic life-threatening zoonotic septicemia and meningitis infections in humans. The capsular polysaccharide is a primary virulence factor for S. suis. As S. suis serotype 2 is the most prevalent serotype globally, the serotype 2 CPS is the primary target of current efforts to develop an effective glycoconjugate veterinary vaccine against S. suis. Possible cross-protection with related serotypes would broaden the coverage of a vaccine. The CPS in serotypes 2 and 1/2 differ at a single residue (Gal versus GalNAc), and both are similar to serotypes 1 and 14: all contain a terminal sialic acid on a side chain. However, despite this similarity, there is complex pattern of cross-protection for these serotypes, with varying estimations of the importance of sialic acid in a protective epitope. Further, a pentasaccharide without the terminal sialic acid has been identified as minimal epitope for serotype 2. Here we use molecular simulation to model the molecule conformations of the CPS in serotypes 2, 1/2, 1 and 14, as well as three vaccine candidate oligosaccharides. The common epitopes we identify assist in rationalizing the apparently contradictory immunological data and provide a basis for rational design of S. suis vaccines in the future
conformation, antigen, capsular polysaccharide, carbohydrate epitopes, cross protection, Streptococcus suis, molecular modelling and simulation
Structure type: polymer chemical repeating unit
Location inside paper: Fig. 1, serotype 2
Compound class: CPS, O-polysaccharide, O-antigen
Contained glycoepitopes: IEDB_130646,IEDB_130697,IEDB_135813,IEDB_136044,IEDB_136794,IEDB_136906,IEDB_137340,IEDB_137472,IEDB_137776,IEDB_140108,IEDB_140122,IEDB_141794,IEDB_141807,IEDB_142488,IEDB_146100,IEDB_146664,IEDB_146668,IEDB_149174,IEDB_151528,IEDB_151531,IEDB_158551,IEDB_190606,IEDB_225177,IEDB_548867,IEDB_548870,IEDB_885823,IEDB_983931,SB_126,SB_132,SB_165,SB_166,SB_170,SB_171,SB_172,SB_173,SB_187,SB_192,SB_195,SB_30,SB_7,SB_84,SB_88
Methods: MD simulations, CarbBuilder, CHARMM36, data analysis, simulation convergence
3D data: molecular modeling
Related record ID(s): 21033, 21034, 21035
NCBI Taxonomy refs (TaxIDs): 1307Reference(s) to other database(s): GTC:G87088VU, GlycomeDB:
37829
Show glycosyltransferases
There is only one chemically distinct structure:
Found 
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