STRUCTURE OF A SURFACE POLYSACCHARIDE FROM ACINETOBACTER-BAUMANNII STRAIN-214

A polysaccharide containing D-galactose, D-glucose, and 2-acetamido-2-deoxy-D-galactose was obtained from an aqueous phenol extract of isolated cell walls from Acinetobacter baumannii strain 214. By means of NMR studies and chemical degradations, the repeating unit of the polymer was identified as a branched trisaccharide of the structure shown. [GRAPHICS] ysate. The oligosaccharides were analyzed by NMR and SIMS and identified as di- and tri-saccaharides having O-(4-deoxy-L-elythro-hex-4-enopyranosyluronic acid)-1 --> at the nonreducing terminus. The trisaccharides from the lysate were found to have root growth-promoting activity in a barley bioassay.