Almost pure I(alpha) cellulose in the cell wall of Glaucocystis.
Almost pure I(alpha) cellulose in the cell wall of Glaucocystis.
复制标题
青囊菌细胞壁中几乎含有纯 I(α) 纤维素。
DOI：
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发表时间：
1999
影响因子：
3
通讯作者：
F. Horii
中科院分区：
文献类型：
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作者：
T. Imai;J. Sugiyama;T. Itoh;F. Horii
利用光谱和衍射技术研究了蓝囊藻细胞壁纤维素微纤丝的结晶特征，并与绿藻门卵囊藻细胞壁纤维素微纤丝的结晶特征进行了比较。虽然这些藻类被分为两个不同的类别，例如它们的叶绿体组成，但它们的细胞壁在大小和形态上非常相似。其纤维素微晶的最显著特征是它们具有迄今为止报道的最高纤维素I（α）含量。特别地，从（13）C NMR分析发现，来自蓝囊藻属的纤维素的I（α）级分高达90%。纤维素微晶在其细胞壁的优先取向的模式也很有趣;赤道0.53-nm的晶格平面取向平行于细胞表面的情况下，蓝囊藻，而0.62-nm的平面平行于卵囊藻细胞表面。这种结构变异为纤维素结构的进化、生物合成及其生物聚集机制提供了另一个联系。
Crystalline features of cellulose microfibrils in the cell walls of Glaucocystis (Glaucophyta) were studied by combined spectroscopy and diffraction techniques, and the results were compared with those of Oocystis (Chlorophyta). Although these algae are grouped into two different classes, by the composition of their chloroplasts for instance, their cell walls are quite similar in size and morphology. The most striking features of their cellulose crystallites are that they have the highest cellulose I(alpha) contents reported to date. In particular, the I(alpha) fraction of cellulose from Glaucocystis was found to be as high as 90% from (13)C NMR analysis. The mode of preferential orientation of cellulose crystallites in their cell walls is also interesting; equatorial 0.53-nm lattice planes were oriented parallel to the cell surface in the case of Glaucocystis, while the 0.62-nm planes were parallel to the Oocystis cell surface. Such a structural variation provides another link to the evolution of cellulose structure, biosynthesis, and its biocrystallization mechanism.