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Related Concept Videos

Actin Filament Depolymerization01:19

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 Polymerization01:42

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...
Introduction to Actin01:26

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.
Formation of Higher-order Actin Filaments01:11

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...
Generation of Straight or Branched Actin Filaments01:14

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 and Cell Motility01:13

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.

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Related Experiment Video

Updated: Jun 25, 2026

Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
06:48

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

Synthesis of actin-depolymerizing compounds.

Kazuhiro Kitamura1, Toshiaki Teruya, Takeshi Kuroda

  • 1Department of Chemistry, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku, Yokohama 223-8522, Japan.

Bioorganic & Medicinal Chemistry Letters
|March 10, 2009
PubMed
Summary
This summary is machine-generated.

New synthetic compounds, based on marine macrolide aplyronine A, effectively depolymerize actin and show antitumor potential. These compounds offer a promising avenue for developing novel cancer therapies.

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Area of Science:

  • Marine natural products chemistry
  • Medicinal chemistry
  • Cancer biology

Background:

  • Aplyronine A is a marine macrolide with demonstrated actin-depolymerizing and antitumor properties.
  • Actin dynamics are crucial in cell proliferation and cancer progression.
  • Targeting actin polymerization is a validated strategy in cancer therapy.

Purpose of the Study:

  • To synthesize novel artificial actin-depolymerizing compounds based on the aplyronine A scaffold.
  • To evaluate the actin-depolymerizing activities of the synthesized compounds.
  • To assess the cytotoxicities of these compounds against cancer cell lines.

Main Methods:

  • Chemical synthesis of aplyronine A analogs (compounds 3-6).
  • In vitro assays to measure actin depolymerization.
  • Cell-based assays to determine cytotoxicity (e.g., MTT assay).

Main Results:

  • Successful synthesis of four novel aplyronine A-based compounds (3-6).
  • Compounds 3-6 exhibited significant actin-depolymerizing activity.
  • Demonstrated varying degrees of cytotoxicity against tested cancer cell lines.

Conclusions:

  • The synthesized compounds retain the actin-depolymerizing mechanism of action of aplyronine A.
  • These novel compounds represent potential leads for the development of new anticancer drugs.
  • Further investigation into their structure-activity relationships and in vivo efficacy is warranted.