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Related Concept Videos

Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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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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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).
In F-actin, the ADF/cofilin proteins...
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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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Actin Polymerization01:42

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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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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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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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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Regulation of actin catch-slip bonds with a RhoA-formin module.

Cho-Yin Lee1,2,3, Jizhong Lou4, Kuo-Kuang Wen5

  • 1Wallace H Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory University, Atlanta, GA, USA.

Scientific Reports
|October 13, 2016
PubMed
Summary
This summary is machine-generated.

Biochemical signaling molecules like RhoA and formin regulate actin dynamics by switching actin catch bonds to slip-only bonds. This modulation is crucial for cell functions, highlighting the biological significance of actin catch bonds.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Biochemistry

Background:

  • Actin cytoskeleton dynamics are regulated by both mechanical forces and biochemical signals.
  • Previous work identified force-induced K113:E195 salt bridges governing actin depolymerization under force (catch-slip bonds).
  • The biochemical regulation and functional importance of actin catch bonds remained unclear.

Purpose of the Study:

  • To elucidate the biochemical regulation of actin catch bonds.
  • To determine the functional significance of actin catch bonds in cellular processes.
  • To investigate how RhoA and formin modulate actin mechanics.

Main Methods:

  • Atomic Force Microscopy (AFM) force-clamp experiments.
  • Simulations of Molecular Dynamics (SMD).
  • Site-directed mutagenesis of actin residues (K113E, E195K, and E/K double mutant).

Main Results:

  • Formin, regulated by RhoA, converts actin catch-slip bonds to slip-only bonds.
  • SMD simulations showed that formin binding disrupts the K113:E195 interaction under force.
  • Mutations K113E and E195K suppressed catch bonds, while the E/K double mutant rescued the interaction.
  • These findings align with observations of RhoA/formin-mediated actin alignment and yeast growth defects.

Conclusions:

  • Actin catch bonds are biologically significant and their mechano-regulation is modulated by biochemical signaling.
  • RhoA and formin play a key role in switching actin catch-slip bonds to slip-only bonds.
  • Actin catch bonds are likely important for various cellular functions, including cytoskeleton organization.