光合细菌和蓝细菌抗原性（脂）多糖中O-甲基糖的位置
Location of O-methyl sugars in antigenic (lipo-)polysaccharides of photosynthetic bacteria and cyanobacteria.
作者信息
Tharanathan R N, Mayer H
出版信息
Biochem J. 1978 May 1;171(2):403-8. doi: 10.1042/bj1710403.
An attempt was made to localize a number of O-methyl sugars in lipopolysaccharides and antigenic polysaccharides isolated from photosynthetic bacteria and from cyano-bacteria. Methylation analysis with [2H3]methyl iodide as methylating agent was the method of choice. One has to differentiate between (lipo-)polysaccharides having only trace amounts (less than 1% of polymer dry weight) of O-methyl sugars and those having them in larger amounts (more than 4% of polymer dry weight). In the former case O-methyl sugars occupy either non-reducing or reducing terminals. When present in larger quantities they may be present as part of each repeating unit either in chain-linked or in terminal positions or in both. A possible role of O-methyl sugars in biosynthesis of O-chains, and their contribution to the lipophilic character of the cell surface are discussed.
人们试图对从光合细菌和蓝细菌中分离出的脂多糖和抗原多糖中的多种O-甲基糖进行定位。以[2H3]碘甲烷作为甲基化试剂进行甲基化分析是首选方法。必须区分仅含有痕量（低于聚合物干重的1%）O-甲基糖的（脂）多糖和含有较多O-甲基糖（超过聚合物干重的4%）的（脂）多糖。在前一种情况下，O-甲基糖占据非还原端或还原端。当大量存在时，它们可能作为每个重复单元的一部分，处于链连接位置或末端位置，或两者皆有。本文讨论了O-甲基糖在O链生物合成中的可能作用及其对细胞表面亲脂性的贡献。
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