title: The structure of the O-specific polysaccharide from the lipopolysaccharide of Pseudomonas sp. OX1 cultivated in the presence of the azo dye Orange II.
abstract: The Gram-negative bacterium Pseudomonas sp. OX1, previously known as Pseudomonas stutzeri OX1, is endowed with a high metabolic versatility. In fact, it is able to utilize a wide range of toxic organic compounds as the only source of carbon and energy for growth. It has been recently observed that, while growing on a glucose-containing liquid medium, Pseudomonas sp. OX1 can reduce azo dyes, ubiquitous pollutants particularly resistant to chemical and physical degradation, with this azoreduction being a process able to generate enough energy to sustain bacterial survival. We have found that, under these conditions, modifications in the primary structure of the O-specific polysaccharide (OPS) within the lipopolysaccharides occur, leading to remarkable changes both in the monosaccharide composition and in the architecture of the repeating unit, with respect to the polysaccharide produced in the absence of azo dyes. In the present paper, we present the complete structure of this O-specific polysaccharide, whose repeating unit is the following: [Formula: see text] This structure is totally different from the one determined from Pseudomonas sp. OX1 grown on rich medium.
authors.affiliation: Dipartimento di Chimica Organica e Biochimica, Università degli Studi di Napoli Federico II, Via Cintia, 4 I-80126 Napoli, Italy.
authors.forename: Serena
authors.initials: S
authors.lastname: Leone
authors.forename: Rosa
authors.initials: R
authors.lastname: Lanzetta
authors.forename: Roberta
authors.initials: R
authors.lastname: Scognamiglio
authors.forename: Fabiana
authors.initials: F
authors.lastname: Alfieri
authors.forename: Viviana
authors.initials: V
authors.lastname: Izzo
authors.forename: Alberto
authors.initials: A
authors.lastname: Di Donato
authors.forename: Michelangelo
authors.initials: M
authors.lastname: Parrilli
authors.forename: Otto
authors.initials: O
authors.lastname: Holst
authors.forename: Antonio
authors.initials: A
authors.lastname: Molinaro
mesh_terms: D001391:Azo Compounds / Q000737:chemistry* / Q000378:metabolism*; D001557:Benzenesulfonates / Q000737:chemistry* / Q000378:metabolism*; D002240:Carbohydrate Sequence; D009682:Magnetic Resonance Spectroscopy; D019081:O Antigens / Q000096:biosynthesis* / Q000737:chemistry*; D011549:Pseudomonas / Q000737:chemistry* / Q000378:metabolism*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D001391:Azo Compounds; D001557:Benzenesulfonates; D019081:O Antigens; C014722:2-naphthol orange