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Related Concept Videos

Actin Polymerization01:42

Actin Polymerization

8.7K
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...
8.7K
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

3.7K
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...
3.7K
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

3.9K
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...
3.9K
Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

3.8K
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...
3.8K
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

6.8K
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....
6.8K
Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

3.3K
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...
3.3K

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Related Experiment Video

Updated: Feb 22, 2026

Reconstitution of Actin-Based Motility with Commercially Available Proteins
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Reconstitution of Actin-Based Motility with Commercially Available Proteins

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Apicomplexan actin polymerization depends on nucleation.

Esa-Pekka Kumpula1, Isa Pires1, Devaki Lasiwa1

  • 1Biocenter Oulu and Faculty of Biochemistry and Molecular Medicine, University of Oulu, Aapistie 7, 90220, Oulu, Finland.

Scientific Reports
|September 24, 2017
PubMed
Summary
This summary is machine-generated.

Malaria parasite actin polymerization follows a classical nucleation-elongation pathway, unlike other apicomplexans. Weak filament contacts cause instability, offering potential drug targets for malaria and related diseases.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Parasitology

Background:

  • Filamentous actin is essential for apicomplexan parasite motility and host cell invasion.
  • Short and unstable parasite actin filaments hinder detailed kinetic characterization due to a lack of robust quantitative methods.

Purpose of the Study:

  • To biochemically characterize Plasmodium falciparum actin kinetics using a modified labeling method.
  • To elucidate the polymerization mechanism and factors contributing to the instability of malaria parasite actin filaments.

Main Methods:

  • Utilized a modified labeling technique for biochemical characterization of Plasmodium falciparum actin.
  • Analyzed actin polymerization kinetics, filament stability, and steady-state concentrations.

Main Results:

  • Plasmodium falciparum actin I polymerizes via the classical nucleation-elongation pathway, distinct from Toxoplasma gondii actin's isodesmic mechanism.
  • Weak lateral contacts within filaments lead to a high fragmentation rate, explaining short filament lengths.
  • At steady state, actin exists as dimers and short filaments with an apparent critical concentration of ~0.1 µM; dimers polymerize but do not nucleate.

Conclusions:

  • The study clarifies the polymerization mechanism of malaria parasite actin, revealing similarities to canonical actins.
  • Identified filament instability due to weak lateral contacts as a key factor in short filament length.
  • Findings provide a basis for targeting parasite actin and nucleators as potential therapeutic strategies against apicomplexan diseases.