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Related Concept Videos

The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Actin and Myosin in Muscle Contraction01:16

Actin and Myosin in Muscle Contraction

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Actin and myosin are contractile proteins that form the sarcomere found in skeletal muscle tissues for regulating muscle contraction. Actin, a globular contractile protein, interacts with myosin for muscle contraction. The skeletal tissue appears striped or striated under a microscope due to the repeated arrangement of contractile proteins actin and myosin along the length of myofibrils. Dark A bands and light I bands repeat along myofibrils, and the alignment of myofibrils in the cell causes...
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Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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Overview of Myosin Structure and Function01:15

Overview of Myosin Structure and Function

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Myosins are a family of molecular motor proteins, first identified in the skeletal muscles, where they are responsible for muscle contraction. Along with their role in muscle contraction, these proteins also play a role in the intracellular transport of molecules and vesicles. There are twenty-four classes of myosins based on their domain sequence and organization. Of the twenty-four, six classes (Myosin I, Myosin II, Myosin V, Myosin VI, Myosin VII, and Myosin X)  have been well...
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Role of Myosin in Cell Migration01:18

Role of Myosin in Cell Migration

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Myosins are multimeric motor proteins involved in various cellular processes such as migration, adhesion, and proliferation. Myosin II is the most common type in animal cells, which binds and cross-links actin filaments.
Myosin II  is a hexamer comprising two heavy chains with globular heads and coiled-coil tails, two regulatory light chains, and two essential light chains. The ATPase sites on the myosin heads hydrolyze ATP, and the released phosphate generates the force for contraction....
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Cell-matrix's Response to Mechanical Forces01:13

Cell-matrix's Response to Mechanical Forces

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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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Related Experiment Video

Updated: Aug 8, 2025

The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

Published on: March 10, 2023

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Bioinspired Membrane Interfaces: Controlling Actomyosin Architecture and Contractility.

Nils L Liebe1, Ingo Mey1, Loan Vuong1

  • 1Institut für Organische und Biomolekulare Chemie, Georg-August Universität, Tammannstr. 2, Göttingen 37077, Germany.

ACS Applied Materials & Interfaces
|February 27, 2023
PubMed
Summary

This study explores how artificial lipid bilayers with specific lipids influence the behavior of actin networks. The findings highlight the critical role of membrane lipid composition in controlling cellular mechanics and function.

Keywords:
ERM proteinsactinfluorescence microscopymyosinsupported lipid bilayers

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

Last Updated: Aug 8, 2025

The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton
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The Mechanics of Poro-Elastic Contractile Actomyosin Networks As a Model System of the Cell Cytoskeleton

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

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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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Area of Science:

  • Biophysics
  • Cell Biology
  • Materials Science

Background:

  • The plasma membrane's interaction with the filamentous (F)-actin network is crucial for cell shape, mechanics, and function.
  • Actin networks are assembled by actin-binding proteins and influenced by the membrane environment.
  • Supported planar lipid bilayers offer a controlled system to study membrane-protein interactions.

Purpose of the Study:

  • To investigate how lipid composition in artificial bilayers affects actomyosin network connectivity and contractility.
  • To understand the role of phosphatidylinositol-4,5-bisphosphate (PtdIns[4,5]P2) and phosphatidylserine (PS) in modulating membrane-actin interactions.
  • To establish a model system for studying membrane-confined biological processes.

Main Methods:

  • Development of phosphatidylinositol-4,5-bisphosphate (PtdIns[4,5]P2)-doped supported planar lipid bilayers.
  • Binding of contractile actomyosin networks to the bilayers via the ezrin linker.
  • High-resolution fluorescence microscopy to analyze network architecture and dynamics.

Main Results:

  • Actomyosin network architecture and dynamics are dependent on PtdIns[4,5]P2 concentration.
  • The presence of negatively charged phosphatidylserine (PS) significantly impacts network behavior.
  • Low, physiologically relevant PS concentrations promote strong actomyosin contractility due to specific membrane connectivity.

Conclusions:

  • Membrane lipid composition, particularly the interplay between PtdIns[4,5]P2 and PS, is a key determinant of actomyosin network contractility.
  • This study emphasizes the importance of the lipid interface in regulating cellular mechanical properties.
  • The developed artificial membrane system provides a valuable platform for future studies on membrane-confined processes.