Abstract
The lipopolysaccharide of Sphaerotilus natans afforded a ladder-like pattern of bands in sodium deoxycholate-polyacrylamide gel electrophoresis, indicating the presence of a S-form lipopolysaccharide. The chemical analysis showed neutral sugars (rhamnose, glucose, l-glycero-d-manno-heptose), 3-deoxy-octulosonic acid (Kdo), amino compounds (glucosamine, glucosamine phosphate, ethanolamine and ethanolamine phosphate), and phosphorus. The lipid A fraction contained saturated and unsaturated capric, lauric, and myristic acids, and 3-hydroxy capric acid (3-OH-10:0). Its chemical structure was consisting of a glucosamine disaccharide, glycosidically substituted by a phosphomonoester, and substituted at C-4′ by a pyrophosphodiester esterified with ethanolamine. The amino groups of both glucosamines are acylated by 3-hydroxy capric acids and these in turn are substituted by saturated and unsaturated capric, lauric, and myristic acids. Hydroxyl groups of the backbone disaccharide at C-3 and C-3′ were also esterified by 3-hydroxy capric acid, those at C-4 and C-6 were unsubstituted. The latter provides the attachment site for Kdo.
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Abbreviations
- Kdo:
-
3-deoxy-d-manno-octulosonic acid
- 3-OH-10:0:
-
3-hydroxy capric acid
- DOC-PAGE:
-
deoxycholate-polyacrylamide gel electrophoresis
- GC-MS:
-
gas chromatography/mass spectrometry
- LD-MS:
-
laser desorption mass spectrometry
- LPS:
-
lipopolysaccharide
- PS:
-
polysaccharide
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Masoud, H., Urbanik-Sypniewska, T., Lindner, B. et al. The structure of the lipid A component of Sphaerotilus natans . Arch. Microbiol. 156, 167–175 (1991). https://doi.org/10.1007/BF00249110
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DOI: https://doi.org/10.1007/BF00249110