Structural studies of a novel exopolysaccharide produced by a mutant of Rhizobium meliloti strain Rm1021

Carbohydr Res. 1990 May 1;198(2):305-12. doi: 10.1016/0008-6215(90)84300-j.


The structure of a novel expolysaccharide obtained from a mutant of Rhizobium meliloti strain Rm1021 was elucidated by a combination of enzymic, chemical, and spectroscopic methods. The polysaccharide is composed of a disaccharide repeating-unit, beta-D-Glcp-(1----3)-alpha-D-Galp-(1----3), having a 6-O-acetyl group attached to most D-glucose residues and a 4,6-O-(1-carboxyethylidene) group attached to every D-galactose residue.

MeSH terms

  • Carbohydrate Conformation
  • Carbohydrate Sequence
  • Disaccharides / analysis
  • Galactose / analysis
  • Glucose / analysis
  • Magnetic Resonance Spectroscopy
  • Methylation
  • Molecular Sequence Data
  • Mutation
  • Polysaccharides, Bacterial* / biosynthesis
  • Rhizobium* / genetics
  • Rhizobium* / metabolism


  • Disaccharides
  • Polysaccharides, Bacterial
  • Glucose
  • Galactose