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Related Concept Videos

Mechanism of Lamellipodia Formation01:31

Mechanism of Lamellipodia Formation

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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...
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Mechanism of Filopodia Formation01:39

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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.
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Assembly of the Lipid Bilayer in the ER01:28

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Biological membranes are more than just a barrier separating cell cytoplasm from the outside environment. They are highly dynamic and help maintain the integrity and physiological stability of the cells as well as membrane-bound organelles. Membranes also play vital roles in cell-to-cell and intracellular communication.
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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.
The high-order actin...
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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.
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...
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Assembly of Cytoskeletal Filaments01:18

Assembly of Cytoskeletal Filaments

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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Updated: May 5, 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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Actin assembly at model-supported lipid bilayers.

George R Heath1, Benjamin R G Johnson, Peter D Olmsted

  • 1School of Physics and Astronomy, University of Leeds, Leeds, United Kingdom.

Biophysical Journal
|November 26, 2013
PubMed
Summary
This summary is machine-generated.

Supported lipid bilayers control actin self-assembly. Varying lipid charge and mobility influences actin network formation, offering a practical method for creating stable lipid-actin systems.

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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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In Vitro Reconstitution of the Actin Cytoskeleton Inside Giant Unilamellar Vesicles
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Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Actin polymerization is fundamental to cellular processes.
  • Controlling actin self-assembly is crucial for biomaterials and nanotechnology.
  • Supported lipid bilayers offer a tunable platform for studying molecular interactions.

Purpose of the Study:

  • To investigate how supported lipid bilayers influence actin polymerization dynamics.
  • To explore the role of lipid properties (charge, mobility) in controlling actin self-assembly.
  • To develop a model describing actin adsorption and polymerization on lipid bilayers.

Main Methods:

  • Utilizing supported lipid bilayers with varying fractions of cationic phospholipids.
  • Manipulating lipid mobility (fluid vs. gel phase) and buffer conditions (pH).
  • Characterizing actin assembly using nanoscale imaging and developing a theoretical model.

Main Results:

  • Fluid-phase bilayers resulted in uniform 2D actin layers, while gel-phase bilayers formed random filament networks.
  • Lowering pH increased actin polymerization rate, nucleation events, and surface coverage.
  • A model confirmed polymerization arises from both surface-bound and solution monomers in fluid bilayers, and primarily solution monomers in gel bilayers.

Conclusions:

  • Supported lipid bilayers provide a versatile platform for controlling nanoscale actin self-assembly.
  • Lipid phase and charge dynamics are key factors in directing actin polymerization.
  • This approach enables the creation of stable, self-assembled lipid-actin systems.