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First published online 27 July 2004
doi: 10.1242/jcs.01296

Journal of Cell Science 117, 4189-4197 (2004)
Published by The Company of Biologists 2004
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Research Article

Stress response in yeast mRNA export factor: reversible changes in Rat8p localization are caused by ethanol stress but not heat shock

Reiko Takemura, Yoshiharu Inoue and Shingo Izawa*

Laboratory of Molecular Microbiology, Graduate School of Agriculture, Kyoto University, Uji, Kyoto 611-0011, Japan

* Author for correspondence (e-mail: izawa{at}kais.kais.kyoto-u.ac.jp)

Accepted 28 April 2004

Ethanol stress (10% v/v) causes selective mRNA export in Saccharomyces cerevisiae in a similar manner to heat shock (42°C). Bulk poly(A)+ mRNA accumulates in the nucleus, whereas heat shock protein mRNA is exported under such conditions. Here we investigated the effects of stress on mRNA export factors. In cells treated with ethanol stress, the DEAD box protein Rat8p showed a rapid and reversible change in its localization, accumulating in the nucleus. This change correlated closely with the blocking of bulk poly(A)+ mRNA export caused by ethanol stress. We also found that the nuclear accumulation of Rat8p is caused by a defect in the Xpo1p/Crm1p exportin. Intriguingly, the localization of Rat8p did not change in heat shocked cells, suggesting that the mechanisms blocking bulk poly(A)+ mRNA export differ for heat shock and ethanol stress. These results suggest that changes in the localization of Rat8p contribute to the selective export of mRNA in ethanol stressed cells, and also indicate differences in mRNA export between the heat shock response and ethanol stress response.

Key words: Stress response, mRNA export, Rat8p/Dbp5p, Xpo1p/Crm1p, Ethanol


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© The Company of Biologists Ltd 2004