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Related Concept Videos

Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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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.
The high-order actin...
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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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Self-Help Support Groups01:28

Self-Help Support Groups

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Self-help support groups are voluntary, community-based organizations that provide a platform for individuals with shared concerns to exchange support, insights, and practical strategies for coping with life challenges. Typically led by group members or paraprofessionals, these groups form a cornerstone of mental health care, especially in reaching populations that are underserved by traditional healthcare systems.
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Introduction to Actin01:26

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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...
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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.
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Support Reactions01:30

Support Reactions

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A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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Related Experiment Video

Updated: Feb 7, 2026

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

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ERM proteins support perinuclear actin rim formation.

Yuval Hadad1, Andrea Fracchia1, Dagmawit Babele1

  • 1Department of Molecular Biology, Faculty of Life Sciences and Ariel Center for Applied Cancer Research, Ariel University, Ariel, Israel.

Frontiers in Cell and Developmental Biology
|February 6, 2026
PubMed
Summary

Ezrin-Radixin-Moesin (ERM) proteins link actin filaments to the nuclear envelope, crucial for cellular processes. These proteins are key to forming the perinuclear actin rim, impacting cell migration and nuclear positioning.

Keywords:
LINC complexcalciumcell migrationemerinezrinmoesinnuclear enveloperadixin

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Measuring Protein Binding to F-actin by Co-sedimentation
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Actin Co-Sedimentation Assay; for the Analysis of Protein Binding to F-Actin
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Measuring Protein Binding to F-actin by Co-sedimentation
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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Actin filament interaction with the nuclear envelope is vital for cell migration, nuclear positioning, and transcriptional control.
  • The Linker of Nucleoskeleton and Cytoskeleton (LINC) complex is the primary known link between F-actin and the nucleus.
  • A perinuclear actin rim forms in response to external forces or migration signals, dependent on Inverted formin 2 (INF2) activation by calcium influx.

Purpose of the Study:

  • To investigate the mechanism coupling the perinuclear actin rim to the nuclear envelope.
  • To determine the role of nuclear membrane protein Emerin in perinuclear actin rim formation.
  • To explore the involvement of Ezrin-Radixin-Moesin (ERM) proteins in linking actin filaments to the nuclear envelope.

Main Methods:

  • Immunofluorescence microscopy to visualize actin and protein localization.
  • CRISPR/Cas9 or siRNA for gene knockdown of ERM proteins.
  • Overexpression studies of ERM proteins and Ezrin.
  • Calcium ionophore treatment to induce actin rim formation.

Main Results:

  • The nuclear membrane protein Emerin is not required for perinuclear actin rim formation.
  • Ezrin-Radixin-Moesin (ERM) proteins localize to the nuclear envelope in melanoma cells.
  • Knockdown of ERM proteins reduced perinuclear actin rim levels; overexpression increased them.
  • Overexpression of Ezrin enhanced actin rim formation in HeLa cells.

Conclusions:

  • ERM proteins are involved in linking actin filaments to the nuclear envelope.
  • ERM proteins play a significant role in the formation and regulation of the perinuclear actin rim.
  • This finding suggests a novel mechanism for actin-nucleus interactions beyond the LINC complex.