地衣Sticta sp.的碳水化合物、糖肽和蛋白质成分以及储存的影响。

Carbohydrate, glycopeptide and protein components of the lichen Sticta sp. and effect of storage.

作者信息

da Silva M de L, Iacomini M, Jablonski E, Gorin P A

机构信息

Departamento de Bioquímica, Universidade Federal do Paraná, Curitiba-PR., Brazil.

出版信息

Phytochemistry. 1993 Jun;33(3):547-52. doi: 10.1016/0031-9422(93)85446-x.

DOI:10.1016/0031-9422(93)85446-x

PMID:7763796

Abstract

Three aldoses, six alditols, eight oligosaccharides, three polysaccharides and a glycopeptide were found in a Sticta sp. The most interesting of these were gentiobiose, -triose and -tetraose, O-alpha-D-Galp-(1-->6)-O-beta-D-Galp-(1-->1)-D-glyceritol released on alkaline treatment, and a polysaccharide with predominant (1-->4)-linked beta-D-Xylp units. Present were a galactoglucomannan, a polysaccharide, possibly a mixture, containing beta-D-Galf, and alpha-L-Araf units and a glycopeptide with alpha- and beta-D-Galf, Galp, Glcp and Manp units, having a core with successive (1-->2)-linked alpha-D-Manp residues substituted at O-3 with those of alpha-D-Galf. After four years storage of the lichen, the contents of the principal polyols, ribitol (0.86%), arabinitol (0.99%) and mannitol (2.50%) fell to practically zero, with the appearance of threitol (0.03%), xylitol (0.01%) and myo-inositol (0.03%). Also, the protein content fell from 34 to 18%. The most abundant amino acids were valine (10.5% of total) in fresh lichen and threonine (14.6%) in stored lichen.

摘要

在一种树花属真菌中发现了三种醛糖、六种糖醇、八种寡糖、三种多糖和一种糖肽。其中最有趣的是龙胆二糖、龙胆三糖和龙胆四糖，经碱性处理后释放出的O-α-D-吡喃半乳糖-(1→6)-O-β-D-吡喃半乳糖-(1→1)-D-甘油醇，以及一种以(1→4)连接的β-D-木糖基单元为主的多糖。还存在一种半乳葡甘露聚糖，一种可能是混合物的多糖，含有β-D-吡喃半乳糖和α-L-阿拉伯呋喃糖单元，以及一种含有α-和β-D-吡喃半乳糖、吡喃半乳糖、吡喃葡萄糖和吡喃甘露糖单元的糖肽，其核心具有连续的(1→2)连接的α-D-吡喃甘露糖残基，在O-3位被α-D-吡喃半乳糖残基取代。地衣储存四年后，主要多元醇核糖醇(0.86%)、阿拉伯糖醇(0.99%)和甘露醇(2.50%)的含量几乎降至零，同时出现了苏糖醇(0.03%)、木糖醇(0.01%)和肌醇(0.03%)。此外，蛋白质含量从34%降至18%。新鲜地衣中最丰富的氨基酸是缬氨酸(占总量的10.5%)，储存地衣中是苏氨酸(14.6%)。