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Assembly of Cytoskeletal Filaments01:18

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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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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been...
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扩散合分子组件:在多个长度尺度上构建协调聚合物的结构.

Kenji Hirai1, Julien Reboul, Nobuhiro Morone

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研究人员开发了一种新的方法,通过控制组件扩散来制造结构性多孔协调聚合物 (PCP). 这种技术可以形成介面层结构,提高材料性能,用于碳化合物分离等应用.

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术
  • 化学 化学 化学

背景情况:

  • 多孔协调聚合物 (PCP) 提供可调节的框架支架,毛孔大小和功能.
  • 将PCP结构化为更大的形态结构对于实际应用至关重要,但对于固体溶液或多变量金属有机框架 (MOF) 具有挑战性.
  • 现有的结构化方法是有限的,并且尚未应用于均混合的多组件MOF.

研究的目的:

  • 为了证明固体溶液PCP的结构化成一个介视盒的超结构.
  • 开发一种使用双向扩散的多组件MOF的新型制造方法.
  • 调查结构超结构对质量转移动学的影响.

主要方法:

  • 使用一个盒式的超结构,包括固体溶液PCP.
  • 多个有机配体 (H2bdc和ndc) 的综合双向扩散到分子组件中.
  • 将母体[Zn2(ndc) 2(bpy) ]n晶体放置在含有H2bdc的DMF溶液中,并加热至80°C,诱导组件扩散和再结晶.

主要成果:

  • 通过双向扩散,在母晶体表面实现了再结晶的空间定位.
  • 成功地将固体溶液PCP ([Zn2(bdc) 1.5 ((ndc) 0.5 ((bpy) ]n) 的纳米晶体组织成一个半透镜盒的上层结构.
  • 证明,由此产生的盒子超结构显著增强了碳化合物分离的质量转移动力学.

结论:

  • 建立了制造结构化固溶液PCP/MOF的新方法.
  • 双向扩散方法使得从分子组件中创建复杂的美索斯科普结构成为可能.
  • 结构化的PCP中增强的质量转移显示了对高效的分离过程的希望.