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A more recent version of this article appeared on April 1, 2004
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Submitted on July 9, 2003
Revised on December 15, 2003
Accepted on January 5, 2004
1 Department of Pharmacology and Biological Chemistry, Mount Sinai School of Medicine, New York, NY 10029
2 Department of Pharmacology and Biological Chemistry, and Department of Medicine, Mount Sinai School of Medicine, New York, NY 10029
3 Department of Pharmacology and Biological Chemistry, Box 1603, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029
* Corresponding author. E-mail address: avrom.caplan{at}mssm.edu.
Hsp90 functions in association with several cochaperones for folding of protein kinases and transcription factors, although the relative contribution of each to the overall reaction is unknown. We assayed the role of nine different cochaperones in the activation of Ste11, a S. cerevisiae mitogen activated protein kinase kinase kinase. Studies on signaling via this protein kinase pathway was measured by 
-factor-stimulated induction of FIG1 or lacZ, and repression of HHF1. All cochaperone mutants tested had reduced FIG1 induction or HHF1 repression, although to differing extents. The greatest defects were in cpr7
, sse1 and ydj1 mutants. Assays of Ste11 kinase activity revealed a pattern of defects in the cochaperone mutant strains that was similar to the gene expression studies. Overexpression of CDC37, a chaperone required for protein kinase folding, suppressed defects the sti1 mutant back to wild-type levels. CDC37 overexpression also restored stable Hsp90 binding to the Ste11 protein kinase domain in the sti1 mutant strain. These data suggest that Cdc37 and Sti1 have functional overlap in stabilizing Hsp90:client complexes. Finally, we show that Cns1 functions in MAP kinase signaling in association with Cpr7.
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