Pharmaceutical Institute, Department of Pharmaceutical Biology, Christian-Albrechts-University of Kiel, Gutenbergstr. 76, 24118 Kiel, Germany.
Biocenter Klein Flottbek, University of Hamburg, Ohnhorststr. 18, 22609 Hamburg, Germany.
Carbohydr Polym. 2017 May 1;163:227-235. doi: 10.1016/j.carbpol.2017.01.043. Epub 2017 Jan 16.
Arabinogalactan-proteins (AGPs) are important proteoglycans of plant cell walls. They seem to be present in most, if not all seed plants, but their occurrence and structure in bryophytes is widely unknown and actually the focus of AGP research. With regard to evolution of plant cell wall, we isolated AGPs from the three mosses Sphagnum sp., Physcomitrella patens and Polytrichastrum formosum. The moss AGPs show structural characteristics common for AGPs of seed plants, but also unique features, especially 3-O-methyl-rhamnose (trivial name acofriose) as terminal monosaccharide not found in arabinogalactan-proteins of angiosperms and 1,2,3-linked galactose as branching point never found in arabinogalactan-proteins before.
阿拉伯半乳聚糖蛋白 (AGPs) 是植物细胞壁的重要糖蛋白。它们似乎存在于大多数，如果不是所有种子植物中，但在苔藓植物中的存在和结构却知之甚少，实际上这也是 AGP 研究的重点。关于植物细胞壁的进化，我们从三种藓类植物（Sphagnum sp.、Physcomitrella patens 和 Polytrichastrum formosum）中分离出 AGPs。这些藓类植物的 AGPs 表现出与种子植物 AGPs 共同的结构特征，但也有独特的特征，特别是 3-O-甲基鼠李糖（俗称 acofriose）作为末端单糖，在被子植物的阿拉伯半乳聚糖蛋白中没有发现，而 1,2,3-连接的半乳糖作为分支点在以前的阿拉伯半乳聚糖蛋白中也从未发现过。
