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Related Concept Videos

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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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

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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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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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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: Jun 9, 2025

Analyzing the α-Actinin Network in Human iPSC-Derived Cardiomyocytes Using Single Molecule Localization Microscopy
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Morphometric analysis of actin networks.

Oghosa H Akenuwa1, Jinmo Gu2, Andreas Nebenführ2

  • 1Department of Chemical and Biomolecular Engineering, University of Tennessee, Knoxville, TN 37996.

Molecular Biology of the Cell
|October 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces validated computational methods to quantify actin network organization. These robust measures accurately assess actin features, aiding research in cell biology and plant science.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • Cytoskeletal organization is crucial for intracellular transport in eukaryotic cells.
  • Quantitative measures for actin networks lack rigorous validation due to missing ground-truth data.

Purpose of the Study:

  • To develop and validate quantitative measures for actin network morphometrics.
  • To provide reliable tools for analyzing actin organization under various conditions.

Main Methods:

  • Coarse-grained computer simulations generated synthetic actin networks with controlled bundling.
  • Simulated networks were converted to pseudofluorescence images for analysis.
  • Morphometric parameters were benchmarked against ground-truth configurations from simulations.

Main Results:

  • A set of reliable parameters was identified to quantify actin network density, orientation, ordering, and bundling.
  • Validated measures were applied to *Arabidopsis thaliana* root cells, revealing subtle differences between wild-type and mutant networks.

Conclusions:

  • This work establishes robust, validated morphometric parameters for quantifying actin network organization.
  • The developed measures facilitate the characterization of actin cytoskeleton changes in diverse experimental contexts, including plant cell research.