Abstract
The O-antigen (lipopolysaccharide) of Anacystis nidulans, strain KM, has been isolated from whole cells and from cell wall preparations by phenolwater extraction. The polysaccharide moiety consists of a D-mannose polymer accompanied by smaller amounts of 3- and 4-O-methyl-D-mannoses, D-galactose, D-glucose, L-fucose, D-glucosamine, mannosamine and 2-keto-3-deoxyoctonate. Aldoheptoses are lacking. The degraded polysaccharide is split from lipid A by acid hydrolysis (10% acetic acid, 100°C, 3 h) whereby 2-keto-3-deoxyoctonate is released in small amounts. Degraded polysaccharide forms only one major fraction by Sephadex G-50 gel-filtration. This fraction includes all the sugars mentioned above except L-fucose, which is released during the acetic acid degradation. Periodate studies and methylation analysis revealed that the poly-mannose chain consists of about 75% 1→3 linked and of 25% 1→4 linked D-mannose units.
Lipid A of A. nidulans is phosphate-free. The main fatty acid, β-hydroxypalmitic acid, is exclusively amide-bound, presumably to the amino group of D-glucosamine. Other fatty acids, found as minor constituents, are β-hydroxymyristic, palmitic and stearic acids. Lipopolysaccharide of A. nidulans KM exhibits high anticomplementary activity in guineapig serum. It is about 800 times less toxic for adrenalectomized mice than endotoxin from Salmonella typhimurium.
The isolated lipopolysaccharide reacts with rabbit antisera against living or heat-killed cells of A. nidulans in passive hemagglutination, when untreated or heated, but not when alkali-treated lipopolysaccharide is used for red blood cell sensibilization. It is concluded that lipopolysaccharide of A. nidulans KM is exposed on the surface of the cell.
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Katz, A., Weckesser, J., Drews, G. et al. Chemical and biological studies on the lipopolysaccharide (O-antigen) of Anacystis nidulans . Arch. Microbiol. 113, 247–256 (1977). https://doi.org/10.1007/BF00492032
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DOI: https://doi.org/10.1007/BF00492032