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Rnd3-induced cell rounding requires interaction with Plexin-B2.

Brad McColl1, Ritu Garg1, Philippe Riou1

  • 1Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, UK.

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Summary

Rnd proteins reorganize the actin cytoskeleton. This study reveals plexin-B2 acts as a downstream target for Rnd3, mediating Rnd3-induced cell rounding and inhibiting cell invasion.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Rnd proteins, atypical Rho GTPases, induce actin reorganization and cell rounding.
  • Rnd proteins bind plexin receptors, but plexin involvement in Rnd-induced cell rounding is unclear.

Purpose of the Study:

  • To investigate the interaction between Rnd proteins and plexin-B receptors.
  • To determine if plexins contribute to Rnd-induced cell rounding and invasion.
  • To elucidate the role of plexin-B2 in Rnd3-mediated cellular functions.

Main Methods:

  • Immunoprecipitation to assess Rnd-plexin interactions.
  • Analysis of R-Ras and Rap1 activity in the presence of Rnd and plexin proteins.
  • Cell rounding assays, stress fiber analysis, and cell invasion assays using HeLa cells.
  • Site-directed mutagenesis to identify key amino acids for Rnd3-plexin-B2 interaction.

Main Results:

  • Rnd3 preferentially interacts with plexin-B2, while Rnd2 interacts with all plexin-B proteins.
  • Plexin-B proteins interact with R-Ras and Rap1, but Rnd proteins do not affect this interaction or activity.
  • Plexin-B2 significantly promotes Rnd3-induced cell rounding, stress fiber loss, and inhibits HeLa cell invasion.
  • Specific amino acid mutations in Rnd3 abolish plexin-B2 interaction and Rnd3-induced morphological changes.

Conclusions:

  • Plexin-B2 is a key mediator of Rnd3-induced cell rounding and invasion inhibition.
  • Plexin-B2 functions as a downstream target of Rnd3, contributing to its cellular effects.
  • Understanding Rnd-plexin interactions provides insights into Rho GTPase signaling and cytoskeletal regulation.