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Related Concept Videos

Actin Polymerization01:42

Actin Polymerization

8.9K
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...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

4.0K
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...
4.0K
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

7.1K
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....
7.1K
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

4.1K
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...
4.1K
Introduction to Actin01:26

Introduction to Actin

6.9K
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...
6.9K
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...
10.0K

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Physical Confinement Modulates the Rate-Limiting Transition in the Release of Phosphate from Actin Filaments.

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Reaching the full potential of cryo-EM reconstructions with molecular dynamics simulations at 310 K: Actin filaments as an example.

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Molecular mechanism of Arp2/3 complex activation by nucleation-promoting factors and an actin monomer.

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Related Experiment Video

Updated: Mar 19, 2026

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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Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops

Published on: July 11, 2025

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Guidelines for Successful Actin Polymerization Experiments.

Thomas D Pollard1,2,3

  • 1Department of Molecular Cellular and Developmental Biology, Yale University, New Haven, Connecticut, USA.

Cytoskeleton (Hoboken, N.J.)
|March 18, 2026
PubMed
Summary
This summary is machine-generated.

This perspective details how to perform actin filament polymerization experiments. It focuses on generating high-quality data for precise quantitative analysis in cell biology research.

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Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
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Area of Science:

  • Biochemistry
  • Cell Biology
  • Biophysics

Background:

  • Actin filaments are crucial cytoskeletal components involved in cell motility, structure, and division.
  • Quantitative analysis of actin polymerization dynamics provides insights into cellular processes.
  • Standardized experimental protocols are needed for reliable and reproducible actin research.

Purpose of the Study:

  • To outline best practices for conducting actin filament polymerization experiments.
  • To guide researchers in obtaining data suitable for quantitative analysis.
  • To improve the reproducibility and rigor of actin dynamics studies.

Main Methods:

  • Discussion of critical parameters in actin polymerization assays.
  • Considerations for reagent preparation and handling.
  • Techniques for data acquisition and initial processing.

Main Results:

  • Identification of key factors influencing polymerization rates and outcomes.
  • Recommendations for experimental design to minimize variability.
  • Strategies for data quality control.

Conclusions:

  • Standardized actin polymerization experiments yield reliable quantitative data.
  • Adherence to best practices enhances the understanding of cytoskeletal dynamics.
  • This perspective serves as a guide for robust actin research.