The O-specific moieties of the O1B antigen (lipopolysaccharide) from Escherichia coli O1B:K1 and the O1C antigen from E. coli O1C:K- both consist of L-rhamnose, D-galactose, N-acetyl-D-glucosamine, and N-acetyl-D-mannosamine in a molar ratio of 2:1:1:1. By using fragmentation procedures, methylation analysis, and one- and two-dimensional nuclear magnetic resonance spectroscopy, the structures of these polysaccharides were found to be [formula: see text] In the O1B polysaccharide X is 2, and in the O1C polysaccharide X is 3. With the recently published structure of the O1A polysaccharides (B. Jann, A. S. Shashkov, D. S. Gupta, S. M. Panasenko, and K. Jann, Carbohydr. Polym. 18:51-57 1992), three related O1 antigens are now known. Their common (O1-specific) epitope is suggested to be the side-chain N-acetyl-D-mannosamine residue.

• Compound ID: 4737
  

  b-D-ManpNAc-(1-2)-+ | -3)-a-L-Rhap-(1-2)-a-L-Rhap-(1-2)-a-D-Galp-(1-3)-b-D-GlcpNAc-(1-

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  Structure type: polymer chemical repeating unit
  Compound class: O-polysaccharide, O-antigen
  Reference(s) to other database(s): GTC:G44507NV, GlycomeDB:28092
  
   
  
  Escherichia coli O1B
  CSDB ID 131788 (all data & tools)
• Compound ID: 4738
  

  b-D-ManpNAc-(1-2)-+ | -3)-a-L-Rhap-(1-2)-a-L-Rhap-(1-3)-a-D-Galp-(1-3)-b-D-GlcpNAc-(1-

  Show graphically

  Show legend Show as text

  Structure type: polymer chemical repeating unit
  Compound class: O-polysaccharide, O-antigen
  Reference(s) to other database(s): GTC:G73186QV, GlycomeDB:28093
  
   
  
  Escherichia coli O1C
  CSDB ID 131789 (all data & tools)