Collagen: A Huge Matrix in Glass Sponge Flexible Spicules of the Meter‐Long Hyalonema sieboldi
Collagen: A Huge Matrix in Glass Sponge Flexible Spicules of the Meter‐Long Hyalonema sieboldi
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胶原蛋白：米长 Hyalonema sieboldi 玻璃海绵柔性骨针中的巨大基质
DOI：
10.1002/9783527619443.ch2
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
Hartmut Worch
中科院分区：
文献类型：
--
作者：
Hermann Ehrlich;Hartmut Worch
Hexactinellida类海绵的内部骨架包括由固体二氧化硅（SiO2 - nH2O）制成的直径约为1毫米的六射线针状物组成的网状结构。它们从纳米级到厘米级的层次结构已经被阐明，但迄今为止，从溶解的硅酸Si(OH)4沉积二氧化硅的有机模板的性质尚未得到鉴定。为了研究与二氧化硅相关的有机基质的结构，我们研究了玻璃绳海绵（Hyalonema sieboldi）茎上的针状体。这些锚定针状体具有显著的尺寸、耐用性、高柔韧性和特殊的光纤特性，这些特性共同使它们成为一种新颖的天然材料。在这些研究中，我们提出了一项研究，证实了我们的假设，即在H. sieboldi针状体内的胶原性质的有机基质是其非凡的机械性能的原因。Hexactinellida海绵生物可以追溯到寒武纪（6亿年前）；因此，可以假设胶原蛋白的进化史至少是同样长的。此外，胶原蛋白还作为磷酸钙和碳酸盐沉积在骨中的模板，这表明二氧化硅和骨骼的进化在胶原蛋白作为生物矿化的统一模板方面具有共同的起源。
The internal skeletons of sponges of the class Hexactinellida comprise a meshwork of six‐rayed spicules of ca. 1 mm diameter made from solid silica (SiO2‐nH2O). Their hierarchical construction from the nanometer to the centimeter scale has been elucidated, but as yet the nature of the organic template on which silica is deposited from dissolved silicic acid Si(OH)4has eluded identification. In order to investigate the structure of the organic matrix associated with silica, we studied spicules from the stalk of the glass rope sponge (Hyalonema sieboldi). These anchoring spicules are remarkable for their size, durability, high flexibility and their exceptional fiber‐optic properties which together render them of interest as a novel natural material. Among these investigations, we present a study confirming our hypothesis that an organic matrix of collagenous nature within the H. sieboldi spicules is responsible for their extraordinary mechanical properties. Hexactinellida sponges are organisms that date back to the Cambrium period (600 million years ago); consequently, it can be assumed that the evolutionary history of collagen is at least equally long. Furthermore, collagen also serves as a template for calcium phosphate and carbonate deposition in bone, suggesting that the evolution of silica and bone skeletons share a common origin with respect to collagen as a unified template for biomineralization.