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Related Experiment Videos

RhoE function is regulated by ROCK I-mediated phosphorylation.

Kirsi Riento1, Nick Totty, Priam Villalonga

  • 1Ludwig Institute for Cancer Research, Royal Free and University College School of Medicine, London, UK.

The EMBO Journal
|March 19, 2005
PubMed
Summary
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ROCK I phosphorylates RhoE, enhancing its stability and activity. This phosphorylation, occurring at serine 11, is crucial for regulating actin filaments and inhibiting cell transformation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • RhoE is a Rho GTPase family member that regulates actin filaments by inhibiting ROCK I, a kinase involved in actomyosin contractility.
  • ROCK I's role in RhoE regulation was previously unclear.

Purpose of the Study:

  • To investigate the effect of ROCK I phosphorylation on RhoE function and stability.
  • To identify the specific phosphorylation sites and regulatory pathways involved.

Main Methods:

  • In vitro kinase assays to determine ROCK I's phosphorylation of RhoE.
  • Cellular localization studies using phospho-specific antibodies.
  • Analysis of RhoE activity in stress fiber disruption and Ras-induced transformation.

Main Results:

Related Experiment Videos

  • ROCK I phosphorylates RhoE at multiple residues in vitro, increasing its protein stability.
  • Phosphorylated RhoE localizes to the cytosol, while unphosphorylated RhoE associates with membranes.
  • ROCK I phosphorylates endogenous RhoE at serine 11 in response to platelet-derived growth factor, dependent on protein kinase C signaling.
  • RhoE phosphorylation correlates with stress fiber disruption and inhibition of Ras-induced transformation.

Conclusions:

  • Phosphorylation is a key mechanism controlling the stability and function of the GTPase-deficient RhoE protein.
  • This study provides the first in vivo evidence of endogenous Rho family member phosphorylation.
  • Regulation of RhoE by ROCK I-mediated phosphorylation impacts cellular processes like actin dynamics and transformation.