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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...

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...

Mechanism of Lamellipodia Formation

Mechanism of Lamellipodia Formation

Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...

Mechanism of Filopodia Formation

Mechanism of Filopodia Formation

Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...

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...

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...

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Related Experiment Video

Updated: Jun 23, 2026

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues

Published on: June 3, 2021

Defining mechanisms of actin polymerization and depolymerization during dendritic spine morphogenesis.

Pirta Hotulainen¹, Olaya Llano, Sergei Smirnov

¹Institute of Biotechnology, University of Helsinki, Helsinki FI-00014, Finland. pirta.hotulainen@helsinki.fi

The Journal of Cell Biology

|April 22, 2009

Summary

The study reveals how actin dynamics, regulated by Rif GTPase and mDia2 formin, control dendritic spine formation and shape. These processes are crucial for synaptic transmission and learning.

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Analysis of Dendritic Spine Morphology in Cultured CNS Neurons

Published on: July 13, 2011

Related Experiment Videos

Last Updated: Jun 23, 2026

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues

A Time-Efficient Fluorescence Spectroscopy-Based Assay for Evaluating Actin Polymerization Status in Rodent and Human Brain Tissues

Published on: June 3, 2021

3D Modeling of Dendritic Spines with Synaptic Plasticity

3D Modeling of Dendritic Spines with Synaptic Plasticity

Published on: May 18, 2020

Analysis of Dendritic Spine Morphology in Cultured CNS Neurons

Analysis of Dendritic Spine Morphology in Cultured CNS Neurons

Published on: July 13, 2011

Area of Science:

Neuroscience
Cell Biology
Molecular Biology

Background:

Dendritic spines are critical for synaptic plasticity, learning, and memory.
The actin cytoskeleton is vital for dendritic spine morphogenesis, but its regulation is poorly understood.

Purpose of the Study:

To elucidate the mechanisms governing actin dynamics during dendritic spine formation.
To identify key regulators of actin polymerization and depolymerization in dendritic spines.

Main Methods:

Investigated actin dynamics in filopodia-like spine precursors.
Utilized molecular biology techniques to study the roles of Rif GTPase, mDia2 formin, Arp2/3 complex, and ADF/cofilin.

Main Results:

Filopodia elongation involves actin polymerization at the tip and root, regulated by Rif and mDia2.
Arp2/3 complex mediates actin nucleation for spine head expansion.
ADF/cofilin-driven actin disassembly is essential for maintaining spine morphology.
Perturbing these actin dynamics alters synaptic transmission.

Conclusions:

Rif GTPase and mDia2 formin are key regulators of actin dynamics in dendritic spine precursors.
A coordinated interplay of actin polymerization and disassembly is required for proper dendritic spine formation and function.
Understanding these mechanisms provides insights into synaptic plasticity and neurological disorders.