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Journal of Bacteriology, February 2000, p. 974-982, Vol. 182, No. 4
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Structural Characterization of the Released Polysaccharide of Desiccation-Tolerant Nostoc commune DRH-1

Richard F. Helm,* Zebo Huang, Devin Edwards, Heidi Leeson, William Peery, and Malcolm Potts

Fralin Biotechnology Center and Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061-0346

Received 26 July 1999/Accepted 18 November 1999

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.

* Corresponding author. Mailing address: Fralin Biotechnology Center, Virginia Tech, Blacksburg, VA 24061-0346. Phone: (540) 231-4088. Fax: (540) 231-7126. E-mail: helmrf{at}vt.edu.

Journal of Bacteriology, February 2000, p. 974-982, Vol. 182, No. 4
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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