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Mol Biol Cell. 1996 Sep; 7(9): 1405–1417.
PMCID: PMC275990

CDC37 is required for p60v-src activity in yeast.


Mutations in genes encoding the molecular chaperones Hsp90 and Ydj1p suppress the toxicity of the protein tyrosine kinase p60v-src in yeast by reducing its levels or its kinase activity. We describe isolation and characterization of novel p60v-src-resistant, temperature-sensitive cdc37 mutants, cdc37-34 and cdc37-17, which produce less p60v-src than the parental wild-type strain at 23 degrees C. However, p60v-src levels are not low enough to account for the resistance of these strains. Asynchronously growing cdc37-34 and cdc37-17 mutants arrest in G1 and G2/M when shifted from permissive temperatures (23 degrees C) to the restrictive temperature (37 degrees C), but hydroxyurea-synchronized cdc37-34 and cdc37-17 mutants arrest in G2/M when released from the hydroxyurea block and shifted from 23 to 37 degrees C. The previously described temperature-sensitive cdc37-1 mutant is p60v-src-sensitive and produces wild-type amounts of p60v-src at permissive temperatures but becomes p60v-src-resistant at its restrictive temperature, 38 degrees C. In all three cdc37 mutants, inactivation of Cdc37p by incubation at 38 degrees C reduces p60v-src-dependent tyrosine phosphorylation of yeast proteins to low or undetectable levels. Also, p60v-src levels are enriched in urea-solubilized extracts and depleted in detergent-solubilized extracts of all three cdc37 mutants prepared from cells incubated at the restrictive temperature. These results suggest that Cdc37p is required for maintenance of p60v-src in a soluble, biologically active form.

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