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Molecular and Cellular Biology, September 2003, p. 6279-6290, Vol. 23, No. 17
0270-7306/03/$08.00+0     DOI: 10.1128/MCB.23.17.6279-6290.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Transcription Initiation of the Yeast IMD2 Gene Is Abolished in Response to Nutrient Limitation through a Sequence in Its Coding Region

Mafalda Escobar-Henriques,1,2,{dagger} Martine A. Collart,2 and Bertrand Daignan-Fornier1*

Institut de Biochimie et Génétique Cellulaires, CNRS UMR 5095, F-33077 Bordeaux Cedex, France,1 Département de Biochimie Médicale, CMU, CH-1211 Geneva 4, Switzerland2

Received 9 April 2003/ Accepted 3 June 2003

The yeast IMD2 to IMD4 and GUA1 genes, involved in GMP synthesis, are highly expressed in exponentially growing cells but are shut off when cells cease to grow upon nutrient limitation. We show for the IMD2 gene that this effect is not specific to certain carbon sources or to growth rate. Strikingly, the cis elements responsible for this nutritional response are contained within a 23-nucleotide sequence in the coding region of the IMD2 gene. Despite its very unusual location, this regulatory sequence mediates the repression of transcription initiation. From our data, we conclude that GMP synthesis is downregulated upon nutrient limitation through an active mechanism. We show that this transcriptional shutoff abolishes any possibility of the induction of IMD2, even under drastic conditions of guanylic nucleotide limitation. Taken together, these results indicate that low levels of guanylic nucleotides could be required for proper entry into stationary phase.

* Corresponding author. Mailing address: Institut de Biochimie et Génétique Cellulaires, CNRS UMR 5095, 1 Rue Camille Saint-Saëns, F-33077 Bordeaux Cedex, France. Phone: 33 5 56 99 90 55. Fax: 33 5 56 99 90 59. E-mail: B.Daignan-Fornier{at}ibgc.u-bordeaux2.fr.

{dagger} Present address: Institute for Genetics, University of Cologne, D-50674 Cologne, Germany.

Molecular and Cellular Biology, September 2003, p. 6279-6290, Vol. 23, No. 17
0022-538X/03/$08.00+0     DOI: 10.1128/MCB.23.17.6279-6290.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



This article has been cited by other articles:

  • Koyama, H., Sumiya, E., Nagata, M., Ito, T., Sekimizu, K. (2008). Transcriptional repression of the IMD2 gene mediated by the transcriptional co-activator Sub1. GENES CELLS 13: 1113-1126 [Abstract] [Full Text]  


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