Structure of surface polysaccharides from Aeromonas sp. AMG272, a plant-growth promoting rhizobacterium isolated from rice rhizosphere

Abstract Aeromonas sp. AMG272 is a Gram-negative bacterium that has been isolated from agricultural soil and studied for its plant growth-promoting activities. Structures of the O-specific polysaccharide chain of the AMG272 lipopolysaccharide and its capsular polysaccharide were elucidated using GLC-MS and NMR spectroscopy. The structure of the O-specific polysaccharide, →4)-α -l- Rha p -(1 → 3)-β -d- Glc p NAc-(1→, has been found in other Aeromonas strains and related bacteria, whereas the structure of the capsular polysaccharide has not been reported before: →6)[β- d -Fuc p 3NAc4Ac-(1 → 3)]-α -d- Glc p NAc-(1 → 4)-α -d- Gal p -(1 → 3)-α -d- Gal p NAc-(1 → 4)-α -d- Gal p -(1 → .