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Molecular and Cellular Biology, November 2000, p. 8093-8102, Vol. 20, No. 21
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Tryptophan Permease Gene TAT2 Confers High-Pressure Growth in Saccharomyces cerevisiae

Fumiyoshi Abe* and Koki Horikoshi

The DEEPSTAR Group, Japan Marine Science and Technology Center, Yokosuka 237-0061, Japan

Received 19 June 2000/Returned for modification 24 July 2000/Accepted 14 August 2000

Hydrostatic pressure in the range of 15 to 25 MPa was found to cause arrest of the cell cycle in G1 phase in an exponentially growing culture of Saccharomyces cerevisiae, whereas a pressure of 50 MPa did not. We found that a plasmid carrying the TAT2 gene, which encodes a high-affinity tryptophan permease, enabled the cells to grow under conditions of pressure in the range of 15 to 25 MPa. Additionally, cells expressing the Tat2 protein at high levels became endowed with the ability to grow under low-temperature conditions at 10 or 15°C as well as at high pressure. Hydrostatic pressure significantly inhibited tryptophan uptake into the cells, and the Tat2 protein level was down-regulated by high pressure. The activation volume associated with tryptophan uptake was found to be a large positive value, 46.2 ± 3.85 ml/mol, indicating that there was a net volume increase in a rate-limiting step in tryptophan import. The results showing cell cycle arrest in G1 phase and down-regulation of the Tat2 protein seem to be similar to those observed upon treatment of cells with the immunosuppressive drug rapamycin. Although rapamycin treatment elicited the rapid dephosphorylation of Npr1 and induction of Gap1 expression, hydrostatic pressure did not affect the phosphorylation state of Npr1 and it decreased the level of Gap1 protein, suggesting that the pressure-sensing pathway may be independent of Npr1 function. Here we describe high-pressure sensing in yeast in comparison with the TOR-signaling pathway and discuss an important factor involved in adaptation of organisms to high-pressure environments.

* Corresponding author. Mailing address: The DEEPSTAR Group, Japan Marine Science and Technology Center (JAMSTEC), 2-15 Natsushima-cho, Yokosuka 237-0061, Japan. Phone: 81-468-675542. Fax: 81-468-666364. E-mail: abef{at}jamstec.go.jp.

Molecular and Cellular Biology, November 2000, p. 8093-8102, Vol. 20, No. 21
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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