Genetic analysis of the interface between Cdc42p and the CRIB domain of Ste20p in Saccharomyces cerevisiae

Genetics. 2003 Jan;163(1):9-20.


Mutagenesis was used to probe the interface between the small GTPase Cdc42p and the CRIB domain motif of Ste20p. Members of a cluster of hydrophobic residues of Cdc42p were changed to alanine and/or arginine. The interaction of the wild-type and mutant proteins was measured using the two-hybrid assay; many, but not all, changes reduced interaction between Cdc42p and the target CRIB domain. Mutations in conserved residues in the CRIB domain were also tested for their importance in the association with Cdc42p. Two conserved CRIB domain histidines were changed to aspartic acid. These mutants reduced mating, as well as responsiveness to pheromone-induced gene expression and cell cycle arrest, but did not reduce in vitro the kinase activity of Ste20p. GFP-tagged mutant proteins were unable to localize to sites of polarized growth. In addition, these point mutants were synthetically lethal with disruption of CLA4 and blocked the Ste20p-Cdc42p two-hybrid interaction. Compensatory mutations in Cdc42p that reestablished the two-hybrid association with the mutant Ste20p CRIB domain baits were identified. These mutations improved the pheromone responsiveness of cells containing the CRIB mutations, but did not rescue the lethality associated with the CRIB mutant CLA4 deletion interaction. These results suggest that the Ste20p-Cdc42p interaction plays a direct role in Ste20p kinase function and that this interaction is required for efficient activity of the pheromone response pathway.

MeSH terms

  • Intracellular Signaling Peptides and Proteins
  • MAP Kinase Kinase Kinases
  • Protein Binding
  • Protein Conformation
  • Protein Structure, Tertiary
  • Protein-Serine-Threonine Kinases / genetics*
  • Protein-Serine-Threonine Kinases / metabolism
  • Saccharomyces cerevisiae / genetics*
  • Saccharomyces cerevisiae / metabolism
  • Saccharomyces cerevisiae Proteins*
  • Two-Hybrid System Techniques
  • cdc42 GTP-Binding Protein, Saccharomyces cerevisiae / genetics*
  • cdc42 GTP-Binding Protein, Saccharomyces cerevisiae / metabolism


  • Intracellular Signaling Peptides and Proteins
  • Saccharomyces cerevisiae Proteins
  • Protein-Serine-Threonine Kinases
  • MAP Kinase Kinase Kinases
  • STE20 protein, S cerevisiae
  • cdc42 GTP-Binding Protein, Saccharomyces cerevisiae