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Related Concept Videos

Actin Polymerization01:42

Actin Polymerization

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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...
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Actin Polymerization and Cell Motility01:13

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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.
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Formation of Higher-order Actin Filaments01:11

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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.
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Electron Carriers01:24

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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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Actin Treadmilling01:18

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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...
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Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
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Related Experiment Video

Updated: Feb 11, 2026

In Vitro Polymerization of F-actin on Early Endosomes
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In Vitro Polymerization of F-actin on Early Endosomes

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Local actin polymerization during endocytic carrier formation.

Claudia Hinze1, Emmanuel Boucrot2,3

  • 1Institute of Structural and Molecular Biology, Division of Biosciences, University College London, London WC1E 6BT, U.K.

Biochemical Society Transactions
|April 22, 2018
PubMed
Summary

The actin cytoskeleton is crucial for various endocytosis pathways, particularly clathrin-independent ones, driving membrane deformation and carrier formation. Its precise role in actin bundling during endocytic pit formation requires further investigation.

Keywords:
actinclathrinclathrin-independent endocytosisendocytosismacropinocytosis

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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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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Endocytosis is vital for cellular uptake of macromolecules, pathogens, and proteins.
  • The actin cytoskeleton plays a significant, though sometimes indirect, role in endocytic processes.
  • Understanding actin's contribution to endocytic carrier formation is key to cell biology.

Purpose of the Study:

  • To review the molecular mechanisms of local actin polymerization in endocytic carrier formation.
  • To differentiate the roles of actin in clathrin-mediated versus clathrin-independent endocytosis.
  • To highlight the molecular players involved in actin recruitment and activation during endocytosis.

Main Methods:

  • Literature review of endocytosis research.
  • Analysis of actin cytoskeleton's role in various endocytic pathways.
  • Examination of molecular adaptors and signaling complexes involved in actin polymerization.

Main Results:

  • Clathrin-mediated endocytosis shows limited reliance on local actin polymerization.
  • Clathrin-independent endocytosis pathways (CLIC/GEEC, caveolae, FEME, macropinocytosis) are highly dependent on actin polymerization.
  • Actin polymerization is powered by Cdc42/N-WASP or Rac1/WAVE complexes engaging the Arp2/3 complex.

Conclusions:

  • Actin polymerization is essential for membrane deformation and budding in clathrin-independent endocytosis.
  • The precise mechanisms of RhoA and formin-mediated actin bundling in endocytic pit formation are not fully understood.
  • Further research is needed to elucidate the complete role of the actin cytoskeleton in diverse endocytic events.