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相关概念视频

Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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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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Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

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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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Protein Complex Assembly02:41

Protein Complex Assembly

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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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Formation of Higher-order Actin Filaments01:11

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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.
The high-order actin...
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Assembly of Complex Microtubule Structures01:32

Assembly of Complex Microtubule Structures

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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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Formation of Ordered Biomolecular Structures by the Self-assembly of Short Peptides
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超越二极化:利用四极体卷式线圈进行纳米结构组装.

Sara Vidmar1,2, Tamara Šmidlehner1, Jana Aupič1

  • 1Department of Synthetic Biology and Immunology, National Institute of Chemistry, Ljubljana, Slovenia.

Angewandte Chemie (International ed. in English)
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PubMed
概括
此摘要是机器生成的。

研究人员使用四面体模块设计了新的蛋白质纳米结构,增强了稳定性,并使这种卷轴-卷轴纳米结构的第一个3D冷电子显微镜结构成为可能,即四面体.

关键词:
卷曲-卷曲-卷曲-卷曲-卷曲-卷曲-卷曲-卷曲-卷曲-卷曲-卷曲-卷曲冷电子显微镜的使用方法蛋白质设计 蛋白质设计蛋白质原始的原始化

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科学领域:

  • 生物化学和结构生物学.
  • 纳米技术和材料科学 纳米技术和材料科学

背景情况:

  • 模块化纳米结构通常使用DNA或多模块构建.
  • 之前的设计通常依赖于卷轴-卷轴二元化单元进行结构组装.
  • 聚类具有超出简单二元体的更高阶寡合态形成的能力.

研究的目的:

  • 调查使用四度模块作为模块化纳米结构中卷轴-卷轴二分化的替代方案.
  • 探索四基模块的潜力,以增加基于蛋白质的纳米结构的复杂性和稳定性.
  • 从相同的多链构建纳米结构.

主要方法:

  • 聚模块的设计和合成,其中包含了四重化螺旋捆.
  • 纳米结构的组装使用这些四度模块在平行或反平行方向.
  • 电子显微镜 (cryo-EM) 用于组装的纳米结构的结构确定.
  • 对抗空气-水接口变质的纳米结构稳定性的评估.

主要成果:

  • 体模块被成功引入,作为卷轴-卷轴二元化单元的替代品.
  • 化螺旋束允许并行和反并行方向,增加拓多样性.
  • 该策略促进了从两个相同的多链中构建纳米结构.
  • 四基模块显著提高了蛋白质纳米结构的稳定性,防止变质.
  • 确定了基于卷轴-卷轴的纳米结构的第一个3D冷电子显微镜结构,揭示了四面体结构.

结论:

  • 四元模块代表了先进的模块化纳米结构的多功能构建块.
  • 这种方法扩大了蛋白质纳米结构的设计空间,允许更复杂的架构.
  • 四度模块提供的增强稳定性对于冷EM等结构特征技术至关重要.
  • 成功确定四面体结构验证了基于四面体的模块化组件的设计原则.