Helm R F, Huang Z, Edwards D, Leeson H, Peery W, Potts M
Fralin Biotechnology Center and Department of Biochemistry, Virginia Tech, Blacksburg, Virginia 24061-0346, USA.
J Bacteriol. 2000 Feb;182(4):974-82. doi: 10.1128/JB.182.4.974-982.2000.
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.
通过色谱和光谱方法确定了耐旱普通念珠藻DRH-1的粘性细胞外多糖（聚糖）的结构。该多糖具有新颖性，因为它具有由D-呋喃核糖和3-O-[(R)-1-羧乙基]-D-葡萄糖醛酸（诺斯托糖醛酸）侧链基团构成的1-4-连接的木糖半乳葡聚糖主链。D-核糖和诺斯托糖醛酸作为外围基团的存在并不常见，并且讨论了它们在调节聚糖流变学性质中的潜在作用。诺斯托糖醛酸存在于来自不同地理位置的普通念珠藻的聚糖中，这表明这种糖醛酸是这种世界性耐旱生物的一个不可或缺的组成部分。
