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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

3.0K
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...
3.0K
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

3.2K
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...
3.2K
Actin Polymerization01:42

Actin Polymerization

6.9K
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...
6.9K
Actin Treadmilling01:18

Actin Treadmilling

8.2K
Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...
8.2K
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

5.4K
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....
5.4K
Introduction to Actin01:26

Introduction to Actin

5.3K
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...
5.3K

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相关实验视频

Updated: Sep 13, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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蒂的内在无序PEVK域调节了actin的聚合.

Áron Gellért Altorjay1, Hedvig Tordai1, Ádám Zolcsák1

  • 1Department of Biophysics and Radiaton Biology, Semmelweis University, 1085 Budapest, Hungary.

International journal of molecular sciences
|July 29, 2025
PubMed
概括

标题: 一个人的心

关键词:
阿尔法折叠是什么意思阿尔法折叠这是一种PEVK.亚丁甲晶体的行为.原子力显微镜的原子力显微镜.本质上是无结构的蛋白质域.聚合试验法 聚合试验法氨酸的作用是指氨酸的作用.支持的脂质双层.这就是Titin Titin.

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Visualizing Actin and Microtubule Coupling Dynamics In Vitro by Total Internal Reflection Fluorescence TIRF Microscopy
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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相关实验视频

Last Updated: Sep 13, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Visualizing Actin and Microtubule Coupling Dynamics In Vitro by Total Internal Reflection Fluorescence TIRF Microscopy
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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:

  • 肌肉蛋白质的结构和功能.
  • 生物化学和分子生物学.
  • 细胞骨动力学 细胞骨动力学

背景情况:

  • 蒂是一种多域肌肉蛋白质,对萨尔科默的弹性和机械感知至关重要.
  • 富含林和充电残留物的titin PEVK域本质上是无序的.
  • 之前的研究表明PEVK域与F-actin结合,但其对actin组装的影响尚不清楚.

研究的目的:

  • 为了研究丁PEVK域对actin组装动态的影响.
  • 描述PEVK对F-actin的结构影响.
  • 探索PEVK在调节肉性活性中的潜在作用.

主要方法:

  • 克隆,表达和净化titin的PEVK域的PEVKII部分.
  • 使用pyrene试验监测actin组合动力学.
  • 通过原子力显微镜 (AFM) 对F-actin-PEVKII复合物的结构分析.

主要成果:

  • 根据度,PEVKII显著提高了actin组装速率和峰值F-actin数量.
  • PEVKII没有改变actin聚合的临界度,这表明核化促进.
  • 在PEVKII的存在下,AFM揭示了短actin丝的辐射对称复合体.

结论:

  • 蒂PEVK域通过促进核化,作为一种actin聚合加速剂.
  • 这种PEVK介导的氨酸组合调节可能调节氨酸氨酸的长度和周转率.
  • 蒂的PEVK域不仅在体缩短中起作用,而且还在调节actin聚合中起作用.