The 70 kDa S6 Kinase Complexes with and Is Activated by the Rho Family G Proteins Cdc42 and Rac1

  title={The 70 kDa S6 Kinase Complexes with and Is Activated by the Rho Family G Proteins Cdc42 and Rac1},
  author={Margaret M. Chou and John Blenis},
The 70 kDa ribosomol S6 kinase (pp70S6k) plays an important role in the progression of cells through G1 phase of the cell cycle. However, little is known of the signaling molecules that mediate its activation. We demonstrate that Rho family G proteins regulate pp70S6k activity in vivo. Activated alleles of Cdc42 and Rac1, but not RhoA, stimulate pp70S6k activity in multiple cell types. Activation requires an intact effector domain and isoprenylation of Cdc42 and Rac1. Coexpression of Dbl, an… CONTINUE READING


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