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Eukaryotic Cell, April 2002, p. 163-173, Vol. 1, No. 2
1535-9778/02/$04.00+0     DOI: 10.1128/EC.1.2.163-173.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Heat Stress Activates the Yeast High-Osmolarity Glycerol Mitogen-Activated Protein Kinase Pathway, and Protein Tyrosine Phosphatases Are Essential under Heat Stress

Astrid Winkler, Christopher Arkind, Christopher P. Mattison, Anne Burkholder, Kathryn Knoche, and Irene Ota*

Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309

Received 10 August 2001/ Accepted 10 December 2001

The yeast high-osmolarity glycerol (HOG) mitogen-activated protein kinase (MAPK) pathway has been characterized as being activated solely by osmotic stress. In this work, we show that the Hog1 MAPK is also activated by heat stress and that Sho1, previously identified as a membrane-bound osmosensor, is required for heat stress activation of Hog1. The two-component signaling protein, Sln1, the second osmosensor in the HOG pathway, was not involved in heat stress activation of Hog1, suggesting that the Sho1 and Sln1 sensors discriminate between stresses. The possible function of Hog1 activation during heat stress was examined, and it was found that the hog1{Delta} strain does not recover as rapidly from heat stress as well as the wild type. It was also found that protein tyrosine phosphatases (PTPs) Ptp2 and Ptp3, which inactivate Hog1, have two functions during heat stress. First, they are essential for survival at elevated temperatures, preventing lethality due to Hog1 hyperactivation. Second, they block inappropriate cross talk between the HOG and the cell wall integrity MAPK pathways, suggesting that PTPs are important for maintaining specificity in MAPK signaling pathways.

* Corresponding author. Mailing address: Department of Chemistry and Biochemistry, Campus Box 215, University of Colorado, Boulder, CO 80309. Phone: (303) 492-0528. Fax: (303) 492-5894. E-mail: Irene.Ota{at}colorado.edu.

Eukaryotic Cell, April 2002, p. 163-173, Vol. 1, No. 2
1535-9778/02/$04.00+0     DOI: 10.1128/EC.1.2.163-173.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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