The structure was elucidated in this paper NCBI PubMed ID:2276143 Publication DOI:10.1016/0008-6215(90)80152-s Journal NLM ID:0043535 Publisher: Elsevier Institutions: Department of Chemistry, University of British Columbia, Vancouver, Canada
The structure of the capsular antigen of E. coli K49 and the oligosaccharides derived from it by partial acid hydrolysis were studied by 1D- and 2D-n.m.r. spectroscopy, g.l.c.-c.i.-mass spectrometry, and methylation analysis. The K49 polysaccharide consists of the repeating unit →4)-β-D-GlcpA-(1→6)-β-D-Galp-(1→6)-β-D-Glcp-(1→3)-β-D-GalpNAc-(1→. The glucuronic acid residues are substituted, in the apparent molar ratio of 4:1, with L-threonine and L-serine linked amidically to the carboxyl group.
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