Molecular orientation and two-component nature of the crystalline fraction of spider dragline silk
Molecular orientation and two-component nature of the crystalline fraction of spider dragline silk
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DOI：
10.1126/science.271.5245.84
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发表时间：
1996-01-05
期刊：
影响因子：
56.9
通讯作者：
Jelinski, LW
中科院分区：
文献类型：
--
作者：
Simmons, AH;Michal, CA;Jelinski, LW
蜘蛛丝特殊机械性能的分子起源尚不清楚。本文介绍了固态H-2核磁共振数据从无取向，取向，和超收缩的纤维，表明拉丝的结晶部分由两种类型的丙氨酸丰富的地区，一个是高度取向和一个是取向不良，不太密集的包装。提出了单个丝分子分子水平结构及其在纤维中排列的新模型。这些数据表明，有必要控制单个聚合物分子的二级结构，以获得生物启发聚合物的最佳性能。
The molecular origin of the exceptional mechanical properties of spider silk is unclear. This paper presents solid-state H-2 nuclear magnetic resonance data from unoriented, oriented, and supercontracted fibers, indicating that the crystalline fraction of dragline silk consists of two types of alanine-rich regions, one that is highly oriented and one that is poorly oriented and less densely packed. A new model for the molecular-level structure of individual silk molecules and their arrangement in the fibers is proposed. These data suggest that it will be necessary to control the secondary structure of individual polymer molecules in order to obtain optimum properties in bio-inspired polymers.