Activated Cdc42 sequesters c-Cbl and prevents EGF receptor degradation

Cdc42 is a Ras-related protein that has been implicated in the control of normal cell growth, and when improperly regulated, in cellular transformation and invasiveness. A variety of extracellular stimuli, including epidermal growth factor (EGF), activate Cdc42. Here, we show that activation of Cdc42 protects the EGF receptor from the negative regulatory activity of the c-CbI ubiquitin ligase. Activated Cdc42 binds to p85Cool-1 (for cloned-out-of-library)/beta-Pix (for Pak-interactive exchange factor), a protein that directly associates with c-CbI. This inhibits the binding of CbI by the EGF receptor and thus prevents CbI from catalyzing receptor ubiquitination. The role played by Cdc42 in regulating the timing of EGIF receptor-CbI interactions is underscored by the fact that constitutively active Cdc42(F28L), by persistently blocking the binding of CbI to these receptors, leads to their aberrant accumulation and sustained EGF-stimulated ERK activation, thus resulting in cellular transformation.