Dominant yeast and mammalian RAS mutants that interfere with the CDC25-dependent activation of wild-type RAS in Saccharomyces cerevisiae.
Two mutant alleles of RAS2 were discovered that dominantly interfere with wild-type RAS function in the yeast Saccharomyces cerevisiae. An amino acid substitution which caused the dominant interference was an alanine for glycine at position 22 or a proline for alanine at position 25. Analogous mutations in human H-ras also dominantly inhibited RAS function when expressed in yeast cells. The inhibitory effects of the mutant RAS2 or H-ras genes could be overcome by overexpression of CDC25, but only in the presence of wild-type RAS. These results suggest that these mutant RAS genes interfere with the normal interaction of RAS and CDC25 proteins and suggest that this interaction is direct and has evolutionarily conserved features.
Powers
S
S
Cold Spring Harbor Laboratory, New York 11724.
O'Neill
K
K
Wigler
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M
D000483:Alleles; D005075:Biological Evolution; D018797:Cell Cycle Proteins; D005656:Fungal Proteins / Q000235:genetics*; D005799:Genes, Dominant; D005800:Genes, Fungal; D011905:Genes, ras; D006801:Humans; D009154:Mutation; D012441:Saccharomyces cerevisiae / Q000235:genetics*; D029701:Saccharomyces cerevisiae Proteins; D013696:Temperature; D018631:ras Proteins; D020666:ras-GRF1
C542351:CDC25 protein, S cerevisiae; D018797:Cell Cycle Proteins; D005656:Fungal Proteins; D029701:Saccharomyces cerevisiae Proteins; D020666:ras-GRF1; C489015:RAS2 protein, S cerevisiae; D018631:ras Proteins