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Molecular and Cellular Biology, August 1999, p. 5474-5485, Vol. 19, No. 8
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Osmotic Stress-Induced Gene Expression in Saccharomyces cerevisiae Requires Msn1p and the Novel Nuclear Factor Hot1p

Martijn Rep,1 Vladimír Reiser,2 Ulrike Gartner,2 Johan M. Thevelein,1 Stefan Hohmann,1,3,* Gustav Ammerer,2 and Helmut Ruis2

Laboratorium voor Moleculaire Celbiologie, Katholieke Universiteit Leuven, B-3001 Heverlee, Flanders, Belgium1; Institute of Biochemistry and Molecular Cell Biology and Ludwig Boltzmann-Forschungsstelle für Biochemie, University of Vienna, A-1030 Vienna, Austria2; and Department of Cell and Molecular Biology/Microbiology, Lundberg Laboratory, Göteborg University, S-405 30 Göteborg, Sweden3

Received 3 March 1999/Returned for modification 8 April 1999/Accepted 28 April 1999

After a sudden shift to high osmolarity, Saccharomyces cerevisiae cells respond by transiently inducing the expression of stress-protective genes. Msn2p and Msn4p have been described as two transcription factors that determine the extent of this response. In msn2 msn4 mutants, however, many promoters still show a distinct rise in transcriptional activity upon osmotic stress. Here we describe two structurally related nuclear factors, Msn1p and a newly identified protein, Hot1p (for high-osmolarity-induced transcription), which are also involved in osmotic stress-induced transcription. hot1 single mutants are specifically compromised in the transient induction of GPD1 and GPP2, which encode enzymes involved in glycerol biosynthesis, and exhibit delayed glycerol accumulation after stress exposure. Similar to a gpd1 mutation, a hot1 defect can rescue cells from inappropriately high HOG pathway activity. In contrast, Hot1p has little influence on the osmotic stress induction of CTT1, where Msn1p appears to play a more prominent role. Cells lacking Msn1p, Msn2p, Msn4p, and Hot1p are almost devoid of the short-term transcriptional response of the genes GPD1, GPP2, CTT1, and HSP12 to osmotic stress. Such cells also show a distinct reduction in the nuclear residence of the mitogen-activated protein kinase Hog1p upon osmotic stress. Thus, Hot1p and Msn1p may define an additional tier of transcriptional regulators that control responses to high-osmolarity stress.

* Corresponding author. Mailing address: Department of Cell and Molecular Biology/Microbiology, Göteborg University, Box 462, S-405 30 Göteborg, Sweden. Phone: 46-31-7732595. Fax: 46-31-7732599. E-mail: hohmann{at}gmm.gu.se.

Molecular and Cellular Biology, August 1999, p. 5474-5485, Vol. 19, No. 8
0270-7306/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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