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Related Concept Videos

Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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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...
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Actin Polymerization and Cell Motility01:13

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

Formation of Higher-order Actin Filaments

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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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Introduction to Actin01:26

Introduction to Actin

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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...
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Condensins02:15

Condensins

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Condensins are large protein complexes that use ATP to fuel the assembly of chromosomes during mitosis. They transform the tangled, shapeless mass of post-interphase DNA into individualized chromosomes by compacting, organizing, and segregating chromosomal DNA.
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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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...
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Related Experiment Video

Updated: Jun 12, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Aip1p Dynamics Are Altered by the R256H Mutation in Actin

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Condensates control the actin cytoskeleton.

Xiaohang Cheng1, Lindsay B Case1

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge, MA, USA.

Developmental Cell
|June 10, 2025
PubMed
Summary
This summary is machine-generated.

Biomolecular condensates containing actin-binding proteins can self-assemble and bundle actin filaments. This occurs even without inherent polymerase or bundling activities, revealing a novel mechanism for actin network formation in cells.

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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Actin filament networks are crucial for cellular functions, requiring precise architectural control.
  • The mechanisms governing the self-assembly and organization of actin filaments are not fully understood.

Purpose of the Study:

  • To investigate the role of biomolecular condensates in the formation of actin filament networks.
  • To determine if F-actin binding proteins within condensates can drive actin assembly and bundling.

Main Methods:

  • Utilized in vitro reconstitution assays to study actin filament formation within biomolecular condensates.
  • Investigated the behavior of purified F-actin binding proteins and actin monomers within phase-separated droplets.

Main Results:

  • Demonstrated that biomolecular condensates containing F-actin binding proteins inherently assemble and bundle actin filaments.
  • Showed this actin organization occurs independently of known actin polymerase or bundling protein activities.
  • Highlighted the spontaneous formation of organized actin structures within the condensates.

Conclusions:

  • Biomolecular condensates can act as scaffolds, promoting actin filament organization through physical interactions.
  • This finding presents a new paradigm for understanding how cells establish complex actin architectures.
  • Suggests a mechanism for rapid actin network formation independent of enzymatic activities.