Abstract
Ethanol stress (10% v/v) causes selective mRNA export in Saccharomyces cerevisiae in a similar manner to heat shock (42 degrees 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.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Active Transport, Cell Nucleus / drug effects
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Active Transport, Cell Nucleus / physiology*
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Cell Nucleus / drug effects
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Cell Nucleus / metabolism
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DEAD-box RNA Helicases
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Ethanol / pharmacology*
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Exportin 1 Protein
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Heat-Shock Response / physiology*
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Karyopherins / metabolism
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Nucleocytoplasmic Transport Proteins / drug effects
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Nucleocytoplasmic Transport Proteins / genetics
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Nucleocytoplasmic Transport Proteins / metabolism*
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Protein Transport / drug effects
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Protein Transport / physiology
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RNA Helicases / drug effects
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RNA Helicases / genetics
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RNA Helicases / metabolism*
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RNA, Fungal / metabolism
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RNA, Messenger / metabolism
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Receptors, Cytoplasmic and Nuclear / metabolism
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Saccharomyces cerevisiae / drug effects
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Saccharomyces cerevisiae / genetics
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Saccharomyces cerevisiae / metabolism*
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Saccharomyces cerevisiae Proteins / drug effects
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Saccharomyces cerevisiae Proteins / genetics
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Saccharomyces cerevisiae Proteins / metabolism*
Substances
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Karyopherins
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Nucleocytoplasmic Transport Proteins
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RNA, Fungal
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RNA, Messenger
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Receptors, Cytoplasmic and Nuclear
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Saccharomyces cerevisiae Proteins
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Ethanol
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DBP5 protein, S cerevisiae
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DEAD-box RNA Helicases
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RNA Helicases