• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >CONTROL OF CRYSTAL PHASE SWITCHING AND ORIENTATION BY SOLUBLE MOLLUSC-SHELL PROTEINS
【24h】

CONTROL OF CRYSTAL PHASE SWITCHING AND ORIENTATION BY SOLUBLE MOLLUSC-SHELL PROTEINS

机译：可溶性软体动物壳蛋白对晶体相变和取向的控制

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

IN the initial stages of the biomineralization of abalone shells, a primer layer of oriented calcite crystals grows on a nucleating protein sheet(1,2), The deposition of this primer is followed by an abrupt transition to c-axis-oriented crystals of aragonite, another crystalline form of calcium carbonate, The formation of each of the two crystal types is accompanied by the synthesis of specific polyanionic proteins(1-3), suggesting that cooperative interactions between these proteins and the inorganic ions during crystal nucleation and growth control the phase of the deposited mineral and that differential expression of the proteins allo,rs the organism to induce phase changes, It is known that soluble shell proteins can control crystal morphology(4-10), but it has been suspected that the switch in phase-from calcite to aragonite-might require the deposition of a new nucleating protein sheet. Here we describe in vitro studies of the crystallization of calcium carbonate in the presence of soluble polyanionic proteins extracted from abalone shell, We find that these proteins alone are sufficient to control the crystal phase, allowing us to switch abruptly and sequentially between aragonite and calcite without the need for deposition of an intervening protein sheet. These results show that soluble organic components can exert greater control over hierarchical biomineral growth than hitherto suspected, offering the prospect of similar phase control in materials chemistry. [References: 19]
机译：在鲍鱼壳生物矿化的初始阶段，定向成方解石晶体的底漆层在成核蛋白薄片上生长（1,2），沉积该底漆后突然过渡为文石的c轴取向晶体碳酸钙的另一种晶型，两种晶型的形成都伴随着特定的聚阴离子蛋白的合成（1-3），这表明这些蛋白与无机离子之间的协同相互作用在晶体成核和生长过程中控制着沉积矿物质的相变和蛋白质的差异表达将使生物体诱导相变。众所周知，可溶性壳蛋白可以控制晶体形态（4-10），但有人怀疑，从方解石到文石，可能需要沉积新的成核蛋白薄片。在这里，我们描述了在从鲍鱼壳中提取的可溶性聚阴离子蛋白质存在下碳酸钙结晶的体外研究。我们发现，这些蛋白质本身足以控制晶相，从而使我们能够在文石和方解石之间突然连续地切换，而无需需要插入蛋白质片。这些结果表明，可溶性有机组分比迄今所怀疑的能更好地控制生物矿物质的分层生长，为材料化学中类似的相控提供了前景。 [参考：19]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号