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Related Concept Videos

Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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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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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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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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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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The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Actin Polymerization01:42

Actin Polymerization

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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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Related Experiment Video

Updated: Dec 21, 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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Actin Mutations and Their Role in Disease.

Francine Parker1, Thomas G Baboolal1, Michelle Peckham1

  • 1School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK.

International Journal of Molecular Sciences
|May 14, 2020
PubMed
Summary

Human actin mutations, often missense, cluster in polymerization regions. Understanding these hotspots, particularly in cardiac actin, is crucial for disease research.

Keywords:
actinmutationmyosinpolymerization

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Probing Myosin Ensemble Mechanics in Actin Filament Bundles Using Optical Tweezers
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Last Updated: Dec 21, 2025

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues
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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Actin is a fundamental protein in eukaryotic cells, essential for cellular structure and function.
  • Humans possess six actin genes encoding distinct isoforms, each susceptible to disease-causing mutations.
  • Most known actin mutations are missense, altering single amino acids.

Purpose of the Study:

  • To analyze the distribution and significance of mutation sites within human actin proteins.
  • To identify specific 'hotspots' of mutation associated with actin-related diseases.
  • To discuss the challenges in understanding the functional impact of actin mutations, especially in the cardiac context.

Main Methods:

  • Bioinformatic analysis of mutation data across human actin isoforms.
  • Identification and mapping of mutation 'hotspots' within the actin protein structure.
  • Review of existing literature on actin mutations and their functional consequences.

Main Results:

  • Mutations in human actin genes are not randomly distributed, with distinct hotspots identified.
  • A significant proportion of these hotspots are located in regions critical for actin polymerization.
  • These findings highlight specific areas of the actin protein that are particularly vulnerable to disease-causing alterations.

Conclusions:

  • Actin mutation hotspots, especially those affecting polymerization, are key areas for understanding actin-related pathologies.
  • Further research into cardiac actin mutations is needed to fully elucidate their role in heart disease.
  • Characterizing the precise effects of these mutations presents significant challenges but is vital for therapeutic development.