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. 1990 Dec;10(12):6809–6812. doi: 10.1128/mcb.10.12.6809

The PRE and PQ box are functionally distinct yeast pheromone response elements.

P Sengupta 1, B H Cochran 1
PMCID: PMC362963  PMID: 2247085

Abstract

Saccharomyces cerevisiae mating pheromones function by binding to cell surface receptors and activating signal transduction processes which regulate gene expression. In this report, we have analyzed the minimum sequence requirements for conferring both a and alpha mating pheromone inducibilities onto a heterologous promoter. Here we show that the repetitive pheromone response element (PRE) which binds to STE12 protein is sufficient to confer pheromone responsiveness only when present in multiple copies. Moreover, by itself, it is preferentially responsive to alpha factor in a cells. In contrast, a single copy of the PQ box of the STE3 upstream activation sequence (UAS) is sufficient to confer a-factor responsiveness in alpha cells. The PQ box binds both MCM1 and MAT alpha 1 in a cooperative manner, and neither the P nor Q site alone is sufficient to confer a-factor responsiveness. In a cells, however, even multiple copies of the PQ box fail to confer alpha-factor responsiveness. Therefore, the PRE and the PQ box are functionally distinct pheromone-responsive elements with opposite cell type specificities. Moreover, these results indicate that the MCM1 protein functions in a signal transduction pathway in a manner analogous to that of its mammalian homolog, the serum response factor, which regulates the expression of the c-fos proto-oncogene in mammals.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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