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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.

Studying the Cytoskeleton

Studying the Cytoskeleton

The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...

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...

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...

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Related Experiment Video

Updated: Jul 4, 2026

Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers

Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers

Published on: July 12, 2022

Lifeact: a versatile marker to visualize F-actin.

Julia Riedl¹, Alvaro H Crevenna, Kai Kessenbrock

¹Max Planck Institute of Biochemistry, Independent Junior Research Group Cellular Dynamics and Cell Patterning, Am Klopferspitz 18, 82152 Martinsried, Germany.

|June 10, 2008

Summary

We developed Lifeact, a peptide for visualizing filamentous actin (F-actin) in cells and tissues. This method overcomes limitations of current actin visualization techniques, enabling live imaging without disrupting cellular processes.

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Live Cell Imaging of F-actin Dynamics via Fluorescent Speckle Microscopy (FSM)

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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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Published on: June 3, 2021

Area of Science:

Cell Biology
Biochemistry
Molecular Biology

Background:

Live imaging of the actin cytoskeleton is essential for understanding fundamental biological processes.
Existing methods for visualizing filamentous actin (F-actin) possess significant limitations.

Purpose of the Study:

To introduce Lifeact, a novel peptide for effective F-actin visualization.
To demonstrate Lifeact's utility in live imaging of actin dynamics in eukaryotic cells and tissues.

Main Methods:

A 17-amino-acid peptide, termed Lifeact, was designed and synthesized.
Lifeact was used to stain F-actin structures in various eukaryotic cell types and tissues.
Chemically modified Lifeact variants were employed for visualizing actin dynamics in cells resistant to transfection.

Main Results:

Lifeact successfully stained F-actin structures in both cultured cells and tissue samples.
In vitro and in vivo experiments confirmed that Lifeact does not impede actin dynamics.
Modified Lifeact enabled visualization of actin dynamics in nontransfectable cells, overcoming a key technical hurdle.

Conclusions:

Lifeact provides a robust and minimally perturbing method for live imaging of F-actin.
This peptide-based approach expands the toolkit for studying actin cytoskeleton dynamics across diverse biological systems.
Lifeact offers a valuable alternative for actin visualization, particularly in cell types where traditional transfection methods are challenging.