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相关概念视频

Formation of Intermediate Filaments00:57

Formation of Intermediate Filaments

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 reported.
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate filaments...
Actin Polymerization01:42

Actin Polymerization

Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight actin...
Types of Intermediate Filaments01:31

Types of Intermediate Filaments

The intermediate filaments are an essential component of the cytoskeleton. Presently six types of intermediate filament have been identified. Type I and II are acidic and basic keratin proteins. Type III is of mesodermal origin and comprises four proteins: vimentin, desmin, glial fibrillary acidic protein (GFAP), and peripherin. Vimentin is commonly found in mesenchymal cells, desmin in muscle cells, GFAP in astrocytes, while peripherin is found in peripheral nervous system neurons (PNS). Type...
Disassembly of Intermediate Filaments01:35

Disassembly of Intermediate Filaments

Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...

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相关实验视频

Updated: Jun 21, 2026

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
08:00

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

螺旋式纳米纤维相的螺旋式纳米纤维相.

L E Hough1, H T Jung, D Krüerke

  • 1Department of Physics and Liquid Crystal Materials Research Center, University of Colorado, Boulder, CO 80309, USA. hough@colorado.edu

Science (New York, N.Y.)
|July 25, 2009
PubMed
概括
此摘要是机器生成的。

亚基拉分子在纳米级纤维中自组装成扭曲的同基拉层. 这种独特的结构形成了一种具有宏观连贯性的液晶相,揭示了新奇的性顺序.

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Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization
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Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments
07:56

Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments

Published on: January 7, 2019

相关实验视频

Last Updated: Jun 21, 2026

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
08:00

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers

Published on: October 25, 2017

Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization
08:03

Scalable Nanohelices for Predictive Studies and Enhanced 3D Visualization

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Drawing and Hydrophobicity-patterning Long Polydimethylsiloxane Silicone Filaments
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科学领域:

  • 材料科学 材料科学 材料科学
  • 晶体学 晶体学是指结晶学.
  • 软物质物理学 软物质物理学

背景情况:

  • 状晶体形成通常涉及分子状性,但由于应变,扭曲通常会从格子中排出.
  • 阿基拉分子通常形成阿基拉结构,缺乏固有的手性.

研究的目的:

  • 为了研究由表现出奇拉性质的奇拉分子形成的材料的有序状态.
  • 了解空间限制如何影响分子排序和对称性破坏.

主要方法:

  • 亚基质分子的自我组装成纳米级的纤维.
  • 在线丝内部层次组织的结构分析.
  • 宏观液晶阶段的表征.

主要成果:

  • 阿基拉分子自组装成周期性有序的纳米尺度纤维.
  • 这些细丝中的层表现出显著的扭曲和严格的同化性,是一种折断对称性的形式.
  • 细丝的集体组织导致了扭曲的宏观连贯性,形成了液晶相.

结论:

  • 在线丝中的空间限制使得无螺旋分子能够形成螺旋结构.
  • 这种自组装过程克服了扭曲与格子排序的不兼容性.
  • 由此产生的液晶相表明了宏观性组织的新机制.