title: Extracellular polysaccharide of Erwinia chrysanthemi A350 and ribotyping of Erwinia chrysanthemi spp.
abstract: Erwinia chrysanthemi spp. are gram-negative bacterial phytopathogens causing soft rots in a number of plants. The structure of the extracellular polysaccharide (EPS) produced by the E. chrysanthemi strain A350, which is a lacZ- mutant of the wild type strain 3937, pathogenic to Saintpaulia, has been determined using a combination of chemical and physical techniques including methylation analysis, low-pressure gel-filtration and anion-exchange chromatography, high-pH anion-exchange chromatography, partial acid hydrolysis, mass spectrometry and 1- and 2D NMR spectroscopy. In contrast to the structures of the EPS reported for other strains of E. chrysanthemi, the EPS from strain A350 contains D-GalA, together with L-Rhap and D-Galp in a 1:4:1 ratio. Evidence is presented for the following hexasaccharide repeat unit: [structure: see text] All the Erwinia chrysanthemi spp. studied to date have been analyzed by ribotyping and collated into families, which are consistent with the related structures of their EPS.
authors.affiliation: Department of Biochemistry, College of Medicine, University of Iowa, Iowa City 52242, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Gray
authors.forename: B Y
authors.initials: BY
authors.lastname: Yang
authors.forename: R
authors.initials: R
authors.lastname: Montgomery
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D016974:Dickeya chrysanthemi / Q000737:chemistry* / Q000235:genetics; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D008969:Molecular Sequence Data; D009005:Monosaccharides / Q000032:analysis; D009844:Oligosaccharides / Q000032:analysis; D010935:Plant Diseases / Q000382:microbiology; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D012699:Serology
chemical_list: D009005:Monosaccharides; D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial