O'Neill M A, Morris V J, Selvendran R R, Sutherland I W, Taylor I T
Carbohydr Res. 1986 Apr 1;148(1):63-9. doi: 10.1016/0008-6215(86)80037-4.
The gelling polysaccharide produced by a species of Enterobacter (NCIB 11870) contains L-fucose, D-glucose, and D-glucuronic acid in the ratios 1:2:1. Analysis of the methylated and methylated, carboxyl-reduced polysaccharide revealed terminal non-reducing glucose, (1----3)-linked fucose, (1----3,1----4)-linked glucose, and (1----4)-linked glucuronic acid in the ratios 1:1:1.2:0.8. From the results of Smith degradation of the polysaccharide and spectroscopic studies of the acidic tetra- and octa-saccharides produced by bacteriophage-induced enzymic depolymerization of the polysaccharide, the following tetrasaccharide repeating-unit is proposed. (Formula: see text). This repeating-unit is identical to that of the capsular polysaccharide produced by Klebsiella aerogenes serotype K54 except for the absence of O-acetyl groups. The effects of the O-acetyl groups on the secondary structure and rheological properties of these polysaccharides are discussed.
一种肠杆菌（NCIB 11870）产生的胶凝多糖含有L-岩藻糖、D-葡萄糖和D-葡萄糖醛酸，其比例为1:2:1。对甲基化以及甲基化且羧基还原的多糖的分析显示，末端非还原葡萄糖、（1→3）连接的岩藻糖、（1→3，1→4）连接的葡萄糖以及（1→4）连接的葡萄糖醛酸的比例为1:1:1.2:0.8。根据该多糖的史密斯降解结果以及由噬菌体诱导的多糖酶解聚产生的酸性四糖和八糖的光谱研究，提出了以下四糖重复单元。（分子式：见原文）。除了没有O-乙酰基外，这个重复单元与产气克雷伯菌血清型K54产生的荚膜多糖的重复单元相同。讨论了O-乙酰基对这些多糖二级结构和流变学性质的影响。
