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J Bacteriol. 1994 August; 176(16): 5156-5159

research-article

Structural characterization of the lipid A of Bordetella pertussis 1414 endotoxin.

Equipe Endotoxines, URA 1116 du Centre National de la Recherche Scientifique, Institut de Biochimie, Université de Paris-Sud, Orsay, France.

ABSTRACT

The structure of Bordetella pertussis 1414 lipid A was investigated by classical methods of chemical analysis as well as plasma desorption mass spectrometry and fast atom bombardment mass spectrometry. Previous analysis showed that it contained a bisphosphorylated beta-(1-->6)-linked D-glucosamine disaccharide with hydroxytetradecanoic acid in amide linkage. The presence of two main molecular species as seen by thin-layer chromatography was confirmed by plasma desorption mass spectrometry, in which the larger signal was attributable to a molecular ion containing two glucosamine, two phosphate, one tetradecanoic acid, one hydroxydecanoic acid, and three hydroxytetradecanoic acid residues. The ion of the smaller signal was lighter by the mass of one hydroxytetradecanoic acid residue (226 Da). The fatty acids in ester linkage were localized by chemical and fast atom bombardment mass spectrometry analysis. C-4 and C-6' hydroxyl groups of the backbone disaccharide were unsubstituted, the latter being the proposed attachment site for Kdo (3-deoxy-D-manno-octulosonic acid).

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