Eukaryotic Cell doi:10.1128/EC.00165-07
Copyright (c) 2007, American Society for Microbiology and/or the Listed Authors/Institutions. All Rights Reserved.
Alteration of the Protein Kinase Binding Domain Enhances Function of the Yeast Molecular Chaperone Cdc37
Min Ren,
Arti Santhanam,
Paul Lee,
Avrom Caplan,
and
Stephen Garrett*
Graduate School of Biomedical Sciences, Department of Microbiology and Molecular Genetics, UMDNJ-New Jersey Medical School, Newark, NJ 07101, Department of Pharmacology and Systems Therapeutics, Mount Sinai School of Medicine, New York, NY 10029
* To whom correspondence should be addressed. Email:
garretst{at}umdnj.edu.
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Abstract |
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Cdc37 is a molecular chaperone that has a general function in the biogenesis of protein kinases. We identified mutations within the putative "protein kinase binding domain" of Cdc37 that alleviate the conditional growth defect of a strain containing a temperature-sensitive allele tpk2(Ts) of the cAMP-dependent protein kinase (PKA). These dominant mutations alleviate the temperature-sensitive growth defect by elevating PKA activity, as judged by their effects on PKA-regulated processes, localization and phosphorylation of the PKA effector Msn2, as well as in vitro PKA activity. Although the tpk2(Ts) growth defect is also alleviated by Cdc37 overproduction, the CDC37 dominant mutants contain wild-type Cdc37 protein levels. In addition, yeast Ste11 protein kinase has an elevated physical interaction with the altered Cdc37 protein. These results implicate specific amino terminal residues in the interaction between Cdc37 and client protein kinases, and provide further genetic and biochemical support for a model in which Cdc37 functions as molecular chaperone for protein kinases.
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