Structural and serological characterisation of the O-antigenic polysaccharide of the lipopolysaccharide from Acinetobacter baumannii strain 24

摘要

Extraction of dry bacteria of Acinetobacter baumannii strain 24 by phenol-water yielded a lipopolysaccharide (LPS) that was studied by serological methods and fatty acid analysis.After immunisation of BALB/c mice with this strain,monoclonal antibody S48-3-13 (IgG_3 isotype) was obtained,which reacted with the LPS in western blot and characterized it as S-form LPS.Degradation of the LPS in aqueous 1% acetic acid followed by GPC gave the O-antigenic polysaccharide,whose structure was determined by compositional analyses and NMR spectroscopy of the polysaccharide and O-deacylated polysaccharide as where QuiN4N is 2,4-diamino-2,4,6-trideoxyglucose and GalNAcA 2-acetamido-2-deoxygalacturonic acid.The amino group at C-4 of the QuipN4N residues is acetylated in about 2/3 of LPS molecules and (S)-3-hydroxybutyrylated in the rest.