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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...

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...

Actin Treadmilling

Actin Treadmilling

Actin filaments undergo polymerization and depolymerization from either end. The polymerization and depolymerization rates depend on the cytosolic concentration of free G-actins. The polymerization rate is generally higher at the plus or barbed end, while the depolymerization rate is higher at the minus or pointed end. At a steady state, critical concentration describes the concentration of free G-actin monomers at which the polymerization rate at the plus end is equal to that of the...

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: May 28, 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

Recent advances into vanadyl, vanadate and decavanadate interactions with actin.

S Ramos¹, J J G Moura, M Aureliano

¹REQUIMTE/CQFB, Dpto Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, 2829-516 Caparica, Portugal.

Metallomics : Integrated Biometal Science

|October 21, 2011

Summary

Vanadium compounds, particularly vanadyl, significantly impact actin structure and polymerization, suggesting vanadium

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Reconstitution of Actin-Based Motility with Commercially Available Proteins

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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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Reconstitution of Actin-Based Motility with Commercially Available Proteins

Reconstitution of Actin-Based Motility with Commercially Available Proteins

Published on: October 28, 2022

Area of Science:

Biochemistry and Molecular Biology
Inorganic Chemistry
Cellular Biology

Background:

Vanadium research is expanding, yet its specific interactions with actin remain underexplored.
Actin is crucial for numerous cellular functions, making it a potential target for vanadium compounds.

Purpose of the Study:

To compare the effects of vanadyl, vanadate, and decavanadate on actin structure and function.
To investigate the potential of vanadium species as regulators of cellular processes through actin modulation.

Main Methods:

Nuclear Magnetic Resonance (NMR) spectroscopy to analyze decavanadate-actin interactions.
Electron Paramagnetic Resonance (EPR) spectroscopy for vanadyl-actin binding stoichiometry.
Light scattering assays to assess G-actin polymerization inhibition.
Fluorescence spectroscopy and ANSA probe for analyzing protein structure changes and hydrophobic surface exposure.
(1)H NMR to detect structural alterations in G-actin.

Main Results:

Decavanadate, but not vanadate, affected actin NMR signals and induced cysteine oxidation, effects prevented by ATP.
Vanadyl exhibited a 1:1 binding stoichiometry with G-actin (Kd = 7.5 μM) and inhibited polymerization (IC50 = 300 μM).
Decavanadate also inhibited polymerization (IC50 = 68 μM), quenched G-actin fluorescence, increased hydrophobic surface area, and altered protein structure, with ATP mitigating these effects.
Both vanadium species accelerated ATP exchange rates in actin.

Conclusions:

Vanadyl and decavanadate differentially interact with actin, affecting its structure, polymerization, and nucleotide binding.
Actin is a potential cellular target for vanadyl and decavanadate, with vanadyl showing higher affinity.
Vanadium's modulation of actin function suggests a role in regulating significant cellular processes.