AlphaPIX and betaPIX and their role in focal adhesion formation

Eur J Cell Biol. 2006 Apr;85(3-4):265-74. doi: 10.1016/j.ejcb.2005.10.007. Epub 2005 Dec 5.


Alpha and betaPIX belong to the group of guanine nucleotide exchange factors (GEFs) that mediate activation of members of the Rho GTPase family, in particular Rac1 and Cdc42, by stimulating the exchange of GDP for GTP. Rho family proteins are well known as regulators of the actin cytoskeleton and have been implicated in the formation of various types of focal adhesion structures. However, the function of GEF proteins during focal adhesion formation is only beginning to emerge. Here, we highlight the recent findings on alpha and betaPIX and their involvement in integrin-dependent signaling and suggest models for the role of PIX proteins during focal adhesion turnover.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Actinin / metabolism
  • Animals
  • Binding Sites
  • Calpain / metabolism
  • Cell Cycle Proteins / genetics
  • Cell Cycle Proteins / metabolism
  • Cell Cycle Proteins / physiology*
  • Focal Adhesions / physiology*
  • G-Protein-Coupled Receptor Kinase 1 / genetics
  • G-Protein-Coupled Receptor Kinase 1 / metabolism
  • Guanine Nucleotide Exchange Factors / genetics
  • Guanine Nucleotide Exchange Factors / metabolism
  • Guanine Nucleotide Exchange Factors / physiology*
  • Humans
  • Models, Biological
  • Multienzyme Complexes / genetics
  • Multienzyme Complexes / metabolism
  • Protein Structure, Tertiary
  • Protein Subunits / metabolism
  • Protein-Serine-Threonine Kinases / genetics
  • Protein-Serine-Threonine Kinases / metabolism
  • Rho Guanine Nucleotide Exchange Factors
  • Signal Transduction
  • p21-Activated Kinases


  • Cell Cycle Proteins
  • Guanine Nucleotide Exchange Factors
  • Multienzyme Complexes
  • PARVB protein, human
  • Protein Subunits
  • Rho Guanine Nucleotide Exchange Factors
  • Actinin
  • Protein-Serine-Threonine Kinases
  • p21-Activated Kinases
  • G-Protein-Coupled Receptor Kinase 1
  • Calpain