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Related Concept Videos

Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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

Formation of Higher-order Actin Filaments

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 networks...
Introduction to Actin01:26

Introduction to Actin

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 different species.
Actin Filament Depolymerization01:19

Actin Filament Depolymerization

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...
Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
The Structure of Intermediate Filaments01:19

The Structure of Intermediate Filaments

The intermediate filaments are one of three widely studied cytoskeletal filaments. They are so named as their diameter (10 nm) is in between that of microfilaments (7 nm) and the microtubules (25 nm).  These filaments are highly stable and can remain intact when exposed to high salt concentrations and detergents. These filaments are responsible for providing stability and mechanical support to the cells. They also help in cell adhesion and maintaining tissue integrity.
Intermediate filaments...

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Related Experiment Video

Updated: May 23, 2026

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
08:02

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

Published on: May 5, 2022

Comparison between actin filament models: coarse-graining reveals essential differences.

Marissa G Saunders1, Gregory A Voth

  • 1Department of Chemistry, Institute for Biophysical Dynamics, James Franck Institute, University of Chicago, 5735 S. Ellis Avenue, Chicago, IL 60637, USA.

Structure (London, England : 1993)
|April 10, 2012
PubMed
Summary
This summary is machine-generated.

Researchers explored actin dynamics by comparing three models of filamentous actin. They identified key motions and an energetic barrier during polymerization, with actin subunits showing polymorphic configurations similar to cryo-EM images.

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Last Updated: May 23, 2026

Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Analyzing the &alpha;-Actinin Network in Human iPSC-Derived Cardiomyocytes Using Single Molecule Localization Microscopy
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Area of Science:

  • Cell Biology
  • Biophysics
  • Structural Biology

Background:

  • Actin's monomer-polymer interconversion is crucial but not fully understood.
  • Lack of high-resolution filamentous actin structure hinders understanding.
  • Recent models propose different structures and dynamics for actin filaments.

Purpose of the Study:

  • To compare three recent models of filamentous actin.
  • To identify structural and dynamic differences between these models.
  • To understand the fundamental process of actin polymerization.

Main Methods:

  • Coarse-grained analysis of molecular dynamics simulations.
  • Comparative analysis of proposed actin models.
  • Evaluation of model stability and key motions.

Main Results:

  • Identified key motions associated with actin polymerization.
  • Discovered a potential energetic barrier in the polymerization process.
  • Observed polymorphic actin subunit configurations similar to cryo-EM data.

Conclusions:

  • The study provides insights into the dynamics and stability of filamentous actin.
  • Key motions and an energetic barrier are proposed for actin polymerization.
  • Actin subunit polymorphism is a significant finding consistent with experimental data.