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Research Article

Compositional analysis of Helicobacter pylori rough-form lipopolysaccharides.

A P Moran, I M Helander, T U Kosunen
A P Moran
Department of Bacteriology and Immunology, University of Helsinki, Finland.
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I M Helander
Department of Bacteriology and Immunology, University of Helsinki, Finland.
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T U Kosunen
Department of Bacteriology and Immunology, University of Helsinki, Finland.
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DOI: 10.1128/jb.174.4.1370-1377.1992
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ABSTRACT

Sodium dodecyl sulfate-polyacrylamide gel electrophoresis was used to analyze the macromolecular heterogeneity of lipopolysaccharides (LPS) from seven fresh clinical isolates and three culture collection strains of the human pathogen Helicobacter pylori. All the clinical isolates produced smooth-form LPS with O side chains of relatively homogeneous chain length, whereas the culture collection strains yielded rough-form LPS. A better yield of the latter LPS was obtained when combined protease pretreatment and hot phenol-water extraction were used than when the conventional phenol-water technique alone was used for extraction. The LPS of the three culture collection strains (S-24, C-5437, and NCTC 11637) were chemically characterized. Constituents common to all the LPS were fucose, D-mannose, D-glucose, D-galactose, D-glycero-D-manno-heptose, L-glycero-D-manno-heptose, and 3-deoxy-D-manno-2-octulosonic acid. The molar ratios of the hexoses differed between different strains, thereby reflecting structural differences. Phosphate, phosphorylethanolamine, and pyrophosphorylethanolamine were present also. Free lipid A contained D-glucosamine and fatty acids, with phosphate and a minor amount of ethanolamine. The major fatty acids were ester- and amide-bound 3-hydroxyoctadecanoic acid and ester-bound octadecanioc and 3-hydroxyhexadecanoic acids, with minor amounts of ester-bound tetradecanoic and hexadecanoic acids. In addition to the uncommonly long 3-hydroxy fatty acids, an unusual phosphorylation pattern was deduced to be present in the lipid A.

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Compositional analysis of Helicobacter pylori rough-form lipopolysaccharides.
A P Moran, I M Helander, T U Kosunen
Journal of Bacteriology Feb 1992, 174 (4) 1370-1377; DOI: 10.1128/jb.174.4.1370-1377.1992

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Compositional analysis of Helicobacter pylori rough-form lipopolysaccharides.
A P Moran, I M Helander, T U Kosunen
Journal of Bacteriology Feb 1992, 174 (4) 1370-1377; DOI: 10.1128/jb.174.4.1370-1377.1992
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