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1. (Article ID: 3458)
 
De Castro C, Molinaro A, Lanzetta R, Silipo A, Parrilli M
Lipopolysaccharide structures from Agrobacterium and Rhizobiaceae species
Carbohydrate Research 343(12) (2008) 1924-1933
 

This review reports and discusses the structural and the biological data available for the lipopolysaccharides from the Gram-negative bacterium Agrobacterium together with those of other related Rhizobiaceae species

Lipopolysaccharide, Rhizobium, symbiosis, Agrobacterium, Tumor induction

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2. (Article ID: 5848)
 
Speciale I, Di Lorenzo F, Gargiulo V, Erbs G, Newman MA, Molinaro A, De Castro C
Biopolymer Skeleton Produced by Rhizobium radiobacter: Stoichiometric Alternation of Glycosidic and Amidic Bonds in the Lipopolysaccharide O-Antigen
Angewandte Chemie, International Edition 59(16) (2020) 6368-6374
 

The lipopolysaccharide (LPS) O-antigen structure of the plant pathogen Rhizobium radiobacter strain TT9 and its possible role in a plant-microbe interaction was investigated. The analyses disclosed the presence of two O-antigens, named Poly1 and Poly2. The repetitive unit of Poly2 constitutes a 4-α-l-rhamnose linked to a 3-α-d-fucose residue. Surprisingly, Poly1 turned out to be a novel type of biopolymer in which the repeating unit is formed by a monosaccharide and an amino-acid derivative, so that the polymer has alternating glycosidic and amidic bonds joining the two units: 4-amino-4-deoxy-3-O-methyl-d-fucose and (2'R,3'R,4'S)-N-methyl-3',4'-dihydroxy-3'-methyl-5'-oxoproline). Differently from the O-antigens of LPSs from other pathogenic Gram-negative bacteria, these two O-antigens do not activate the oxidative burst, an early innate immune response in the model plant Arabidopsis thaliana, explaining at least in part the ability of this R. radiobacter strain to avoid host defenses during a plant infection process.

carbohydrates, structure elucidation, saccharides, structural biology, Biopolymers

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