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Applied and Environmental Microbiology, May 1999, p. 2020-2024, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Accumulation of Trehalose by Overexpression of tps1, Coding for Trehalose-6-Phosphate Synthase, Causes Increased Resistance to Multiple Stresses in the Fission Yeast Schizosaccharomyces pombe

Teresa Soto, Juana Fernández, Jero Vicente-Soler, Jose Cansado, and Mariano Gacto*

Department of Genetics and Microbiology, Facultad de Biología, University of Murcia, 30071 Murcia, Spain

Received 5 October 1998/Accepted 21 February 1999

Recent studies have shown that heat shock proteins and trehalose synthesis are important factors in the thermotolerance of the fission yeast Schizosaccharomyces pombe. We examined the effects of trehalose-6-phosphate (trehalose-6P) synthase overexpression on resistance to several stresses in cells of S. pombe transformed with a plasmid bearing the tps1 gene, which codes for trehalose-6P synthase, under the control of the strong thiamine-repressible promoter. Upon induction of trehalose-6P synthase, the elevated levels of intracellular trehalose correlated not only with increased tolerance to heat shock but also with resistance to freezing and thawing, dehydration, osmostress, and toxic levels of ethanol, indicating that trehalose may be the stress metabolite underlying the overlap in induced tolerance to these stresses. Among the isogenic strains transformed with this construct, one in which the gene coding for the trehalose-hydrolyzing enzyme, neutral trehalase, was disrupted accumulated trehalose to a greater extent and was more resistant to the above stresses. Increased trehalose concentration is thus a major determinant of the general stress protection response in S. pombe.

* Corresponding author. Mailing address: Department of Genetics and Microbiology, Facultad de Biología, University of Murcia, 30071 Murcia, Spain. Phone: 34 68 367132. Fax: 34 68 363963. E-mail: maga{at}fcu.um.es.

Applied and Environmental Microbiology, May 1999, p. 2020-2024, Vol. 65, No. 5
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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