Abstract
The chemical structure of the O-specific chain of the Sphaerotilus natans lipopolysaccharide was established. The isolated polysaccharide moiety contained neutral sugars (rhamnose, glucose, and l-glycero-d-manno-heptose), 3-deoxy-d-manno-octulosonic acid (Kdo), phosphate and ethanolamine. Alditol acetate and methylation analyses showed that the O-specific chain contained linear pentasaccharide repeating units, composed of four units of rhamnose, substituted at 3-position, and one unit of glucose, substituted at 4-position. Oxidation by chromium trioxide showed that all sugars were α-linked. The structure proposed for the O-specific chain has been confirmed by periodate oxidation, and by 1H-and 13C-NMR spectroscopic studies for the original and the Smith-degraded PS moiety. The O-specific unit of the S. natans LPS has the following structure:
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Abbreviations
- LPS:
-
lipopolysaccharide
- PS:
-
polysaccharide
- Kdo:
-
3-deoxy-d-manno-octulosonic acid
- ld :
-
heptose, l-glycero-d-manno-heptose
- NMR:
-
nuclear magnetic resonance
- APT:
-
attached proton test
- GC-MS:
-
gas-chromatography/mass spectrometry
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Masoud, H., Neszmelyi, A. & Mayer, H. Chemical characterization of the O-specific chain of Sphaerotilus natans ATCC 13338 lipopolysaccharide. Arch. Microbiol. 156, 176–180 (1991). https://doi.org/10.1007/BF00249111
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DOI: https://doi.org/10.1007/BF00249111