Arf6 regulates RhoB subcellular localization to control cancer cell invasion

Related Experiment Video

Updated: Jan 6, 2026

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells
10:27

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Published on: March 9, 2012

11.2K

Kossay Zaoui1,2, Charles V Rajadurai1,2, Stéphanie Duhamel3

  • 1Department of Biochemistry, McGill University, Montreal, Quebec, Canada.

The Journal of Cell Biology
|October 9, 2019
PubMed

Insights

ADP-ribosylation factor 6 (Arf6) regulates RhoB protein stability and localization. Arf6 depletion causes RhoB degradation, affecting cell migration and cytoskeletal dynamics.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • ADP-ribosylation factor 6 (Arf6) is a small GTPase involved in membrane trafficking and cytoskeletal organization.
  • The precise regulatory mechanisms governing Arf6 function remain incompletely understood.

Purpose of the Study:

  • To elucidate the interaction between Arf6 and RhoB.
  • To investigate the role of Arf6 in regulating RhoB localization, stability, and downstream cellular functions.

Main Methods:

  • Co-immunoprecipitation assays to detect Arf6-RhoB complex formation.
  • Confocal microscopy to visualize subcellular localization of Arf6 and RhoB.
  • Arf6 depletion studies using siRNA.
  • Analysis of actin and focal adhesion dynamics.
  • Assessment of 3D cell migration assays.

Main Results:

  • Arf6 forms a complex with RhoB, mediated by specific glycine, cysteine, and isoleucine residues in RhoB.
  • Arf6 targeting to specific membranes promotes RhoB recruitment.
  • Arf6 depletion leads to RhoB loss from endosomes and subsequent degradation via the endolysosomal pathway.
  • Arf6 depletion impairs actin and focal adhesion dynamics and enhances Met-activated 3D cell migration.

Conclusions:

  • Arf6 plays a critical role in the subcellular targeting and stability of RhoB.
  • Arf6 is essential for RhoB's biological functions, including regulation of cytoskeletal dynamics and cell migration.
  • This study reveals a novel regulatory axis between Arf6 and RhoB.

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