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相关概念视频

Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

3.7K
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...
3.7K
Introduction to Actin01:26

Introduction to Actin

6.4K
Actin is a highly conserved cytoskeletal protein found abundantly in eukaryotic cells. It constitutes 10% weight of the total cellular protein in muscle cells, while in non-muscle cells, it is lower and makes up around 1–5 percent of the total cell protein. Actin found in the unicellular amoebae and complex multicellular animals is around 80% similar, demonstrating their conservation over a billion years of evolution.  Actin coding genes are conserved within species and across...
6.4K
Actin Polymerization01:42

Actin Polymerization

8.3K
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...
8.3K
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

3.6K
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...
3.6K
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

3.8K
Actin filaments (F-actin) are composed of actin subunits. The dissociation of actin monomers can occur from either end of F-actin. The rate of dissociation is faster from the minus-end or the pointed end, where the actin subunits exist with a bound ADP, together known as ADP-actin. The depolymerization of F-actin is aided by proteins, including the actin-depolymerizing factor (ADF) and cofilin family of proteins, gelsolin, and glia maturation factor (GMF).
In F-actin, the ADF/cofilin proteins...
3.8K
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

6.5K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
6.5K

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Reconstituting and Characterizing Actin-Microtubule Composites with Tunable Motor-Driven Dynamics and Mechanics
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一个通用的理论框架来研究多元组件actin动力学.

Mintu Nandi1, Shashank Shekhar2, Sandeep Choubey3,4

  • 1Department of Chemistry, Indian Institute of Engineering Science and Technology, Shibpur, Howrah, India.

PLoS computational biology
|September 8, 2025
PubMed
概括

一个新的运动模型解释了多种蛋白质如何调节actin丝长度. 这个框架有助于分析实验数据,并了解复杂的细胞动态 in vivo.

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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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科学领域:

  • 细胞生物学 细胞生物学
  • 生物物理学的生物物理.
  • 生物化学 生物化学

背景情况:

  • 动蛋白丝长度对于细胞功能至关重要.
  • 已知各个actin结合蛋白的作用,但它们对体内动态的综合作用尚不清楚.
  • 现有的显微镜技术提供了高通量数据,但缺乏理论框架.

研究的目的:

  • 开发一个一般的动力模型,用于多元组分调节的动力学行为.
  • 为了解多种蛋白质如何集体控制行为线长度提供理论框架.
  • 为了使实验数据的机械解释的行为动力学.

主要方法:

  • 提出了一种关于actin动态的一般运动模型.
  • 结合了任意数量的调节蛋白的综合作用.
  • 导出精确的闭式表达式,用于发光线长度分布的时刻.

主要成果:

  • 导出的时刻可以区分不同的多组件调节机制.
  • 该模型提供了随着时间的推移对丝长度分布的定量预测.
  • 该框架成功地整合了多种活性蛋白结合蛋白的影响.

结论:

  • 拟议的动力学模型为actin动力学提供了一个统一的理论框架.
  • 这种框架对于解释细胞生物学中复杂的实验数据至关重要.
  • 它将指导未来的实验,研究多组分调节的actin.