The circular dichroism (CD) of synthetic mono- and oligosaccharides that represent the terminal, non-reducing group of O-antigens of Vibrio cholerae O1 from the subtypes Ogawa and Inaba was measured in various solvents. We found differences in the CD of the monosaccharides of these subtypes that decrease with increasing chain lengths of the oligosaccharides. The differences can be explained by different orientations of the N-acyl side chain of the terminal monosaccharides. The linear relationship of ellipticity versus the number of residues in an oligosaccharide chain follows the principle of optical superposition. This, together with a similar contribution by internal units to the overall ellipticity, suggests an identical, regular conformation of oligosaccharide fragments of both Ogawa and Inaba series.
oligosaccharide, polysaccharide, polysaccharides, conformational, O-antigens, O-specific, O-specific polysaccharide, difference, fragment, Vibrio, Vibrio cholerae, Vibrio cholerae O1, O-specific polysaccharides, circular dichroism
NCBI PubMed ID: 10230041Journal NLM ID: 0043535Publisher: Elsevier
Institutions: Institute of Chemistry, Slovak Academy of Sciences, Bratislava, Slovak Republic
Methods: CD
Found