Role of p120 Ras-GAP in directed cell movement

Sarang V. Kulkarni, Gerald Gish, Peter Van Der Geer, Mark Henkemeyer, Tony Pawson

Research output: Contribution to journalArticlepeer-review

135 Scopus citations


We have used cell lines deficient in p120 Ras GTPase activating protein (Ras-GAP) to investigate the roles of Ras-GAP and the associated p190 Rho-GAP (p190) in cell polarity and cell migration. Cell wounding assays showed that Ras-GAP-deficient cells were incapable of establishing complete cell polarity and migration into the wound. Stimulation of mutant cells with growth factor rescued defects in cell spreading, Golgi apparatus fragmentation, and polarized vesicular transport and partially rescued migration in a Ras- dependent manner. However, for directional movement, the turnover of stress fibers and focal adhesions to produce an elongate morphology was dependent on the constitutive association between Ras-GAP and p190, independent of Ras regulation. Disruption of the phosphotyrosine-mediated Ras-GAP/p190 complex by microinjecting synthetic peptides derived from p190 sequences in wild-type cells caused a suppression of actin filament reorientation and migration. From these observations we suggest that although Ras-GAP is not directly required for motility per se, it is important for cell polarization by regulating actin stress fiber and focal adhesion reorientation when complexed with 190. This observation suggests a specific function for Ras-GAP separate from Ras regulation in cell motility.

Original languageEnglish (US)
Pages (from-to)457-470
Number of pages14
JournalJournal of Cell Biology
Issue number2
StatePublished - Apr 17 2000


  • Actin
  • Cell polarity
  • Cytoskeleton
  • Migration
  • p190 Rho-GAP

ASJC Scopus subject areas

  • Cell Biology


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