Abstract
Lipopolysaccharide isolated from Legionella pneumophila (Phil. 1) was examined for chemical composition. The polysaccharide split off by mild acid hydrolysis contained rhamnose, mannose, glucose, quinovosamine, glucosamine and 2-keto-3-deoxyoctonate, in molar proportions 1.6:1.8:1.0:1.5:4.1:2.7. Heptoses were absent and glucose was probably mainly phosphorylated. The carbohydrate backbone of the lipid A part consisted of glucosamine, quinovosamine and glycerol, in the molar ratios 3.9:1.0:3.4, with glycerol as a phosphorylated moiety. A complex fatty acid substitution pattern comprising eight O-ester-linked, exclusively nonhydroxylated acids, and nineteen amide-linked, exclusively 3-hydroxylated acids was revealed. Both straight- and branched (iso and anteiso) carbon chains occurred. The major hydroxy fatty acid was 3-hydroxy-12-methyltridecanoic acid and six others were of a chain-length above 20 carbon atoms, with 3-hydroxy-20-methyldocosanoic acid as the longest. Two dihydroxy fatty acids, 2,3-dihydroxy-12-methyltridecanoic and 2,3-dihydroxytetradecanoic acids, were also detected. These results suggest that L. pneumophila contains a rather complex and unusual lipopolysaccharide structure of considerable biological and chemotaxonomic interest.
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Abbreviations
- LPS:
-
lipopolysaccharide
- PS:
-
polysaccharide
- KDO:
-
2-keto-3-deoxy-octonate
- GC:
-
gas chromatography
- GC-MS:
-
gas chromatograph-mass spectrometer combined instrument
- CI:
-
chemical ionization
- EI:
-
electron impact
- HF:
-
hydrofluoric acid
- TFA:
-
trifluoroacetyl
- TMS:
-
trimethylsilyl
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Sonesson, A., Jantzen, E., Bryn, K. et al. Chemical composition of a lipopolysaccharide from Legionella pneumophila . Arch. Microbiol. 153, 72–78 (1989). https://doi.org/10.1007/BF00277544
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DOI: https://doi.org/10.1007/BF00277544