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A polysaccharide containing D-GalNAc, D-Glc and 4-acetamido-4,6-dideoxy-D-glucose (Qui4NAc) was isolated from the phenol-soluble lipopolysaccharide originating from Acinetobacter baumannii strain 9. The structure of the repeating unit was shown by means of monosaccharide analyses, Smith-degradation, partial acid hydrolysis, mass spectrometry, and NMR spectroscopy to be a branched pentasaccharide, in which the tetrasaccharide backbone is built from amino sugars only. [structure: see text] The polysaccharide was identified by serological and western blot analyses as the O-antigen of the lipopolysaccharide.
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Haseley et al. (1998) studied this question.
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