title: Structural characterization of the released polysaccharide of desiccation-tolerant Nostoc commune DRH-1.
abstract: The structure of the viscous extracellular polysaccharide (glycan) of desiccation-tolerant Nostoc commune DRH-1 was determined through chromatographic and spectroscopic methods. The polysaccharide is novel in that it possesses a 1-4-linked xylogalactoglucan backbone with D-ribofuranose and 3-O-[(R)-1-carboxyethyl]-D-glucuronic acid (nosturonic acid) pendant groups. The presence of D-ribose and nosturonic acid as peripheral groups is unusual, and their potential roles in modulating the rheological properties of the glycan are discussed. Nosturonic acid was present in the glycans of N. commune from diverse geographic locations, suggesting that this uronic acid is an integral component of this cosmopolitan anhydrophile.
authors.affiliation: Fralin Biotechnology Center and Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061-0346, USA. helmrf@vt.edu
authors.forename: R F
authors.initials: RF
authors.lastname: Helm
authors.forename: Z
authors.initials: Z
authors.lastname: Huang
authors.forename: D
authors.initials: D
authors.lastname: Edwards
authors.forename: H
authors.initials: H
authors.lastname: Leeson
authors.forename: W
authors.initials: W
authors.lastname: Peery
authors.forename: M
authors.initials: M
authors.lastname: Potts
mesh_terms: D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D000458:Cyanobacteria / Q000737:chemistry / Q000502:physiology*; D003890:Desiccation; D006358:Hot Temperature; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D009844:Oligosaccharides / Q000032:analysis; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis* / Q000737:chemistry*; D014574:Uronic Acids / Q000737:chemistry
chemical_list: D009844:Oligosaccharides; D011135:Polysaccharides, Bacterial; D014574:Uronic Acids