Acetan is a bacterial polysaccharide produced by Acetobacter xylinum NRRL B42. Chemical mutagenesis of A.xylinum allowed selection of a mutant strain which produced a new polysaccharide, CR1/4. 2D NMR methods have been used to assign the 1H and 13C spectra of the two polysaccharides and to determine that CR1/4 has the structure shown below. The total number of O-acetyl groups is slightly less than two per repeating unit. [formula: see text] The pentasaccharide side chain of acetan is truncated to a disaccharide unit in CR1/4, but the structures are otherwise identical. In particular, the degree of acetylation is about the same and the O-acetyl groups are located at the same position in both polysaccharides.

NMR, structure, Bacterial, strain, polysaccharide, mutant, Bacterial polysaccharide, Acetobacter, extracellular, acetan, Acetobacter xylinum

• Compound ID: 1724
  

  b-D-GlcpA-(1-2)-a-D-Manp6Ac-(1-3)-+ | -4)-b-D-Glcp6Ac-(1-4)-b-D-Glcp-(1-

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  Structure type: polymer chemical repeating unit
  Trivial name: acetan, acetan tetramer, CR1/4
  Compound class: EPS
  Reference(s) to other database(s): GTC:G66584GU, GlycomeDB:25365
  
   
  
  Acetobacter xylinum NRRL (CR1/4)
  CSDB ID 1240 (all data & tools)