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Related Concept Videos

Actin Polymerization01:42

Actin Polymerization

8.8K
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...
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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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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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Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

7.0K
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....
7.0K
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

3.3K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
3.3K
Actin Treadmilling01:18

Actin Treadmilling

10.0K
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...
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Related Experiment Video

Updated: Mar 10, 2026

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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Pattern Formation in Polymerizing Actin Flocks: Spirals, Spots, and Waves without Nonlinear Chemistry.

T Le Goff1, B Liebchen1, D Marenduzzo1

  • 1SUPA, School of Physics and Astronomy, University of Edinburgh, Peter Guthrie Tait Road, Edinburgh, EH9 3FD, United Kingdom.

Physical Review Letters
|December 17, 2016
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Summary

This study introduces a simple model of actin polymerization that explains the formation of actin waves, spots, and spirals. It reveals a universal mechanism for actin pattern generation without complex biochemistry.

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Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
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Reconstitution of Actin-Based Motility with Commercially Available Proteins
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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
  • Biophysics
  • Pattern formation

Background:

  • Actin dynamics are crucial for cell motility and structure.
  • Actin organization can form complex patterns like waves, spots, and spirals.
  • Understanding these patterns is key to cell function and disease.

Purpose of the Study:

  • To propose a minimal biophysical model for actin-wave formation.
  • To explain the emergence of diverse actin patterns from basic principles.
  • To provide a framework for understanding in vivo and in vitro actin organization.

Main Methods:

  • Developed a computational model based on actin treadmilling and polymerization.
  • Simulated actin filament dynamics starting from an isotropic, low-density state.
  • Analyzed pattern formation as filament density reached the Onsager threshold.

Main Results:

  • The model successfully reproduced characteristic actin states: spots, spirals, and traveling waves.
  • Actin filament alignment at the Onsager threshold destabilized the isotropic phase, inducing transient patterns.
  • A universal pathway to polarized actin structures, including wave trains (flocks), was demonstrated.

Conclusions:

  • Actin wave formation can arise from a universal mechanism driven by polymerization and alignment, independent of specific nonlinear biochemistry.
  • The model offers insights into the in vivo mechanisms of actin spot and wave observation.
  • The findings suggest a simplified experimental setup for generating similar actin patterns in vitro.