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.
journal_name
Curr Genetjournal_title
Current geneticsauthors
Swinnen E,Rosseels J,Winderickx Jdoi
10.1007/s00294-005-0583-3subject
Has Abstractpub_date
2005-07-01 00:00:00pages
18-33issue
1eissn
0172-8083issn
1432-0983journal_volume
48pub_type
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