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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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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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Mechanism of Lamellipodia Formation01:31

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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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Cell Polarization by Rho Proteins01:21

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Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...
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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).
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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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Related Experiment Video

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Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
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ARAP1 fine-tunes F-actin polymerization level in lymphocytes through RhoA inhibition.

Yoshihiro Ueda1, Naoyuki Kondo1, Yuji Kamioka1

  • 1Department of Molecular Genetics, Institute of Biomedical Science, Kansai Medical University, Hirakata, Osaka, Japan.

Frontiers in Immunology
|January 5, 2026
PubMed
Summary

Ankyrin repeat and PH domain 1 (ARAP1) fine-tunes cell migration by regulating RhoA activity. ARAP1 deficiency enhances cell motility, while its overexpression inhibits it, impacting F-actin polymerization.

Keywords:
ARAP1F-actin polymerizationRA-domainRhoARhoGAPchemokine

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Rho family GTPases are essential for cell functions like motility and adhesion.
  • The precise coordination of F-actin polymerization and actomyosin contractility is not fully understood.

Purpose of the Study:

  • To investigate the role of ankyrin repeat and PH domain 1 (ARAP1) in modulating RhoA activity.
  • To elucidate the spatiotemporal regulation of cell migration by ARAP1.

Main Methods:

  • Studied ARAP1's interaction with RhoA, Rac, and Rap1 using its Ras-association (RA) and RhoGAP domains.
  • Analyzed ARAP1 recruitment to cell protrusions upon chemokine stimulation.
  • Assessed cell migration, RhoA activation, and F-actin polymerization in ARAP1-deficient and overexpressing cells.

Main Results:

  • ARAP1 transiently localized to cell protrusions after chemokine stimulation.
  • ARAP1-deficient cells showed increased RhoA activation, F-actin polymerization, and enhanced migration.
  • ARAP1 overexpression inhibited cell migration, dependent on its RhoGAP domain, and required RA domain binding to Rap1 and Rac1.

Conclusions:

  • ARAP1 acts as a dual GTPase-activating protein (GAP) that modulates RhoA activity.
  • ARAP1 regulates RhoA at Rac/Rap1-rich protrusions, fine-tuning F-actin polymerization and cell motility.