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Journal of Bacteriology, April 2001, p. 2331-2334, Vol. 183, No. 7
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.7.2331-2334.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

TOR Modulates GCN4-Dependent Expression of Genes Turned on by Nitrogen Limitation

Lourdes Valenzuela, Cristina Aranda, and Alicia González*

Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, 04510 Mexico City, Mexico

Received 26 October 2000/Accepted 5 January 2001

In Saccharomyces cerevisiae, the rapamycin-sensitive TOR signaling pathway plays an essential role in up-regulating translation initiation and cell cycle progression in response to nutrient availability. One of the mechanisms by which TOR regulates cell proliferation is by excluding the GLN3 transcriptional activator from the nucleus and, in consequence, preventing its transcriptional activation therein. We examined the possibility that the TOR cascade could also control the transcriptional activity of Gcn4p, which is known to respond to amino acid availability. The results presented in this paper indicate that GCN4 plays a role in the rapamycin-sensitive signaling pathway, regulating the expression of genes involved in the utilization of poor nitrogen sources, a previously unrecognized role for Gcn4p, and that the TOR pathway controls GCN4 activity by regulating the translation of GCN4 mRNA. This constitutes an additional TOR-dependent mechanism which modulates the action of transcriptional activators.

* Corresponding author. Mailing address: Departamento de Genética Molecular, Instituto de Fisiología Celular, Universidad Nacional Autónoma de México, Apartado Postal 70-242, 04510, Mexico City, Mexico. Phone: 56225631. Fax: 56225630. E-mail: amanjarr{at}ifisiol.unam.mx.

Journal of Bacteriology, April 2001, p. 2331-2334, Vol. 183, No. 7
0021-9193/01/$04.00+0   DOI: 10.1128/JB.183.7.2331-2334.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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