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相关概念视频

Assembly of Complex Microtubule Structures01:32

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Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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相关实验视频

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Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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控制基于DNA的六角形微结构的层次组合.

Tetsunao Makino1, Takashi Kajitani2, Makiko Tanaka1

  • 1Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo, 182-8585, Japan.

Small (Weinheim an der Bergstrasse, Germany)
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概括

研究人员通过加热和冷却来控制DNA组装形态. 像管和框架这样的层次液晶DNA结构是由不同的DNA链长度和悬浮序列形成的.

关键词:
它们是DNA DNA DNA DNA.DNA纳米技术 DNA纳米技术液晶水晶的液体晶体是什么自动组装的自动组装机

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Stable DNA Motifs, 1D and 2D Nanostructures Constructed from Small Circular DNA Molecules
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科学领域:

  • 生物分子的自我组装.
  • DNA纳米技术 DNA纳米技术
  • 液晶材料是一种液晶材料.

背景情况:

  • 对于先进的纳米材料来说,DNA的等级自我组装是至关重要的.
  • 控制DNA液晶中的形态仍然是一个挑战.
  • 了解溶液中的DNA相互作用是可预测组装的关键.

研究的目的:

  • 为了研究分层液晶DNA组件的受控形态.
  • 探索DNA链长度和悬浮序列如何影响组装结构.
  • 阐明DNA管和六角框架形成背后的机制.

主要方法:

  • 加热和缓慢冷却双链DNA (dsDNA) 溶液.
  • 使用聚乙烯糖醇 (PEG) 和盐溶液来诱导自组装.
  • 使用X射线散射测量来分析液晶结构.
  • 不同的dsDNA长度 (25mer和18mer) 和悬浮序列 (AA/TT,GG/CC).

主要成果:

  • 微型六角形DNA血小板的自发形成.
  • 添加较短的dsDNA (18mer) 与AA/TT悬浮,导致具有中心阻塞的分子管.
  • 添加了18mer dsDNA与GG/CC悬架形成六角框架.
  • X射线散射证实了管和框架的六角柱状液晶相.
  • 18毫米的DNA定位在边缘,25毫米的DNA形成了中央核.

结论:

  • 通过操纵DNA长度和悬浮序列,可以控制地形成等级DNA组件.
  • 枯竭吸引力 (PEG) 和dSDNA突起的端到端堆叠驱动自我组装.
  • 不同的化温度使阶段性层次组装成为可能.
  • 悬浮的序列变化通过改变生长方向来决定组件形态.