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The minimum domain of Pho81 is not sufficient to control the Pho85–Rim15 effector branch involved in phosphate starvation-induced stress responses

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Abstract

The phosphate regulatory mechanism in yeast, known as the PHO pathway, is regulated by inorganic phosphate to control the expression of genes involved in the acquisition of phosphate from the medium. This pathway is also reported to contribute to other nutritional responses and as such it affects several phenotypic characteristics known also to be regulated by protein kinase A, including the transcription of genes involved in the general stress response and trehalose metabolism. We now demonstrate that transcription of post-diauxic shift (PDS)-controlled stress-responsive genes is solely regulated by the Pho85–Pho80 complex, whereas regulation of trehalose metabolism apparently involves several Pho85 cyclins. Interestingly, both read-outs depend on Pho81 but, while the previously described minimum domain of Pho81 is sufficient to sustain phosphate-regulated transcription of PHO genes, full-length Pho81 is required to control trehalose metabolism and the PDS targets. Consistently, neither the expression control of stress-regulated genes nor the trehalose metabolism relies directly on Pho4. Finally, we present data supporting that the PHO pathway functions in parallel to the fermentable growth medium- or Sch9-controlled pathway and that both pathways may share the protein kinase Rim15, which was previously reported to play a central role in the integration of glucose, nitrogen and amino acid availability.

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Acknowledgements

This work was supported by a fellowship from the Fund of Scientific Research in Flanders (FWO-Vlaanderen) to E.S. and by grants from FWO-Vlaanderen and the research fund of K.U. Leuven

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  1. Functional Biology, Katholieke Universiteit Leuven, Kasteelpark Arenberg 31, 3001, Heverlee, Belgium

    Erwin Swinnen, Joëlle Rosseels & Joris Winderickx

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  1. Erwin Swinnen
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  2. Joëlle Rosseels
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Correspondence to Joris Winderickx.

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Swinnen, E., Rosseels, J. & Winderickx, J. The minimum domain of Pho81 is not sufficient to control the Pho85–Rim15 effector branch involved in phosphate starvation-induced stress responses. Curr Genet 48, 18–33 (2005). https://doi.org/10.1007/s00294-005-0583-3

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