Taxonomic group: bacteria / Proteobacteria
(Phylum: Proteobacteria)
Associated disease: infection due to Escherichia coli [ICD11:
XN6P4 
]
The structure was elucidated in this paperNCBI PubMed ID: 6341054Publication DOI: 10.1111/j.1432-1033.1983.tb07291.xJournal NLM ID: 0107600Publisher: Oxford, UK: Blackwell Science Ltd. on behalf of the Federation of European Biochemical Societies
Institutions: Max-Planck-Institut fur Immunbiologie, Freiburg
The primary structure of the K12 antigenic capsular polysaccharide (K12 antigen) of Escherichia coli O4:K12:H- was elucidated by composition, nuclear magnetic resonance spectroscopy, methylation, periodate oxidation and oligosaccharide analysis. The polysaccharide consists of repeating trisaccharide α-rhamnosyl-1,2-α-rhamnosyl-1,5-dOclA units (dOclA = 2-keto-3-deoxy-D-manno-octonic acid) which are joined through β-2,3-linkages. About 50% of the dOclA units are O-acetylated at C7 or C8. The sequence of acetylated and non-acetylated dOclA residues is not known. As had been reported before, the polysaccharide is linked to a phosphatidic acid at the reducing end (dOclA) via a phosphodiester bridge. The serologically specific part of the K12 antigen is its polysaccharide moiety.
Structure type: polymer chemical repeating unit
Compound class: CPS, K-antigen
Contained glycoepitopes: IEDB_133754,IEDB_136105,IEDB_225177,IEDB_885823
Methods: 13C NMR, 1H NMR, GC-MS
Comments, role: linked to -P-P-1)[hexadeca`1-3),hexadecanoate(1-2)]glycerol
Related record ID(s): 101035, 122711
NCBI Taxonomy refs (TaxIDs): 83333Reference(s) to other database(s): GTC:G56911RB, GlycomeDB:
658
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There is only one chemically distinct structure:
Found 
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