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Function and regulation of RhoE.

K Riento1, P Villalonga, R Garg

  • 1Ludwig Institute for Cancer Research, Royal Free and University College School of Medicine, 91 Riding House Street, London W1W 7BS, UK.

Biochemical Society Transactions
|July 27, 2005
PubMed
Summary
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Rnd proteins, including RhoE, regulate cell structure and division by inhibiting RhoA signaling. Phosphorylation controls RhoE

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Rnd proteins (Rnd1, Rnd2, RhoE/Rnd3) are atypical Rho GTPases that bind GTP but do not hydrolyze it.
  • Unlike classical Rho GTPases, Rnd proteins are not regulated by GTP/GDP binding.
  • Rnd proteins antagonize RhoA, inhibiting stress fiber formation in cells.

Purpose of the Study:

  • To investigate the function and regulation of RhoE, a member of the Rnd protein family.
  • To elucidate the mechanisms by which RhoE influences cell structure, cell cycle, and transformation.

Main Methods:

  • Expression analysis of Rnd proteins in cultured fibroblasts and epithelial cells.
  • Investigation of RhoE localization and interactions using biochemical assays.
  • Analysis of RhoE phosphorylation by Rho-associated kinase I (ROCK I).

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Main Results:

  • Increased Rnd protein expression causes loss of stress fibers, opposing RhoA's effects.
  • RhoE inhibits RhoA signaling by binding to and inhibiting ROCK I.
  • RhoE phosphorylation by ROCK I enhances its stability and ability to induce stress fiber loss.
  • RhoE independently inhibits cell cycle progression and H-Ras-induced fibroblast transformation.

Conclusions:

  • RhoE is a multifunctional regulator of cell structure, cell cycle, and transformation.
  • RhoE's localization and activity are modulated by phosphorylation, primarily by ROCK I.
  • RhoE represents a novel target for understanding and potentially manipulating cell behavior.