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Introduction to Actin

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 Depolymerization

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...

Actin Polymerization

Actin Polymerization

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 actin...

Formation of Higher-order Actin Filaments

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...

Actin Polymerization and Cell Motility

Actin Polymerization and Cell Motility

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.

Generation of Straight or Branched Actin Filaments

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...

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Related Experiment Video

Updated: May 23, 2026

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

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

Active actin gels.

Shahid M Khan, Rehan Ali, Nimra Asi

Communicative & Integrative Biology

|April 7, 2012

Summary

Self-organization of actin filaments in vitro reveals ordered microdomains powered by myosin motors. Understanding these dynamics requires integrating physics and cell biology principles.

Area of Science:

Interdisciplinary research bridging cell biology and condensed matter physics.

Background:

Actin filament self-organization is crucial for cellular functions.
In vitro assays enable precise control over mechanical and chemical properties for theoretical model testing.

Purpose of the Study:

To review recent advancements in understanding actin filament self-organization using in vitro motility assays.
To explore the influence of motor proteins and filament density on emergent structures.

Main Methods:

Utilizing in vitro motility assays to observe actin filament behavior.
Investigating individual filament collisions to understand population dynamics.
Analyzing the impact of motor and filament surface density and mechanochemical kinetics.

Main Results:

Keywords:

biopolymers computer tracking cytoskeleton in vitro motility molecular motors

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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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Emergence of ordered actin filament microdomains powered by myosin motors at high densities.
Weak apolar interactions and local filament deformations during crossovers are reduced at high motor densities.
Current research focuses on motor/filament density and motor mechanochemical cycle kinetics.

Conclusions:

Theoretical models need refinement, particularly rigid rod filament approximations.
Accessory proteins in cells modulate actin structures, leading to complex behaviors like motility and chemotaxis.
Developing predictive frameworks requires collaboration between theoreticians and experimentalists to link molecular properties to cellular phenomena.