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Related Concept Videos

Actin Filament Depolymerization01:19

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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).
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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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Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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The Contractile Ring02:15

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Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
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Generation of Straight or Branched Actin Filaments01:14

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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.
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Disassembly of Intermediate Filaments01:35

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Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
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Related Experiment Video

Updated: Apr 24, 2026

Aip1p Dynamics Are Altered by the R256H Mutation in Actin
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Vinculin E29R mutation changes cellular mechanics.

Vera Auernheimer1, Wolfgang H Goldmann1

  • 1Department of Physics, Biophysics Group, Friedrich-Alexander-University of Erlangen-Nuremberg, 91052 Erlangen, Germany.

Biochemical and Biophysical Research Communications
|September 7, 2014
PubMed
Summary
This summary is machine-generated.

The E29R mutation in vinculin significantly increases cell stiffness and adhesion strength by enhancing F-actin binding. This molecular change strengthens focal adhesions and cellular contractility.

Keywords:
F-actinFocal adhesionMechanotransductionTalinVinculin

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Area of Science:

  • Cell Biology
  • Biophysics
  • Molecular Biology

Background:

  • Vinculin is a key protein in focal adhesions, regulating cell-matrix and cell-cell interactions.
  • Cellular mechanical properties are crucial for various biological processes, including cell migration and tissue development.

Purpose of the Study:

  • To investigate the impact of the E29R point mutation on vinculin's mechanical functions.
  • To determine how this mutation affects cellular stiffness, adhesion strength, and focal adhesion dynamics.

Main Methods:

  • Transfection of mouse embryonic fibroblast (MEF) vinculin knockout cells with wild-type or E29R mutant eGFP-vinculin.
  • Measurement of cellular stiffness and adhesion strength.
  • Analysis of cellular strain energy using 2D traction microscopy.
  • Assessment of vinculin dynamics via fluorescence recovery after photobleaching (FRAP).

Main Results:

  • Mutant E29R vinculin significantly increased cellular stiffness and adhesion strength compared to wild-type vinculin.
  • E29R mutant cells exhibited higher strain energy, indicating increased cellular contractility.
  • FRAP experiments revealed slower recovery times and a larger mobile fraction for E29R vinculin, suggesting altered dynamics.

Conclusions:

  • The E29R mutation may prime the vinculin head for enhanced F-actin binding.
  • This priming leads to increased cell stiffness, contractile force, and strengthened focal adhesions.
  • The findings provide insights into the mechanical regulation of cell adhesion by vinculin.