Structural and Serological Characterisation of the O‐Specific Polysaccharide from Lipopolysaccharide of Acinetobacter calcoaceticus Strain 7 (DNA Group 1)

Abstract
S‐form lipopolysaccharide was isolated by phenol/water extraction from a strain of Acinetobacter calcoaceticus (DNA group 1). The structure of the O‐antigenic polysaccharide was determined by compositional analysis and NMR spectroscopy of the de‐O‐acylated lipopolysaccharide. The isolated polysaccharide obtained after hydrolysis of lipopolysaccharide in 0.01 M trifluoroacetic acid has the following structure: in which Pyr is pyruvate. The O‐acetyl substitution of D‐Gal was non‐stoichiometric. The O‐antigen was specifically recognised in western blots by polyclonal rabbit antisera.

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