Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: UNIPROT:P51532 (transcriptional activator)
 6,546 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Overexpression of the YAP1 transcriptional activator renders yeast cells resistant to multiple metabolic inhibitors. In an effort to identify other gene products required for this phenotype we have isolated genomic mutations which neutralize this effect. One such mutation was further characterized and the affected gene was shown to be identical to TPS2 which encodes trehalose phosphate phosphatase, an enzyme catalysing the second step in trehalose biosynthesis. We have analysed the transcriptional regulation of the TPS2 gene and have shown that its transcription is induced by a variety of stressful conditions caused by metabolic inhibitors, osmotic shock and heat shock. This transcriptional activation is mediated by multiple stress promoter elements (C4T) and requires the function of Yap1p as well as reduced activity of the cAMP-regulated protein kinase. Using an appropriate reporter gene we have shown that Yap1p is generally required for transcriptional regulation through the C4T stress element. These results show that the YAP1 protein has a pivotal role in the metabolic stress response and the acquisition of stress tolerance.
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PMID:Yap1p, a yeast transcriptional activator that mediates multidrug resistance, regulates the metabolic stress response. 807 99

The stress response promoter element (STRE) confers increased transcription to a set of genes following environmental or metabolic stress in Saccharomyces cerevisiae. A lambda gt11 library was screened to isolate clones encoding STRE-binding proteins, and one such gene was identified as MSN2, which encoded a zinc-finger transcriptional activator. Disruption of the MSN2 gene abolished an STRE-binding activity in crude extracts as judged by both gel mobility-shift and Southwestern blot experiments, and overexpression of MSN2 intensified this binding activity. Northern blot analysis demonstrated that for the known or suspected STRE-regulated genes DDR2, CTT1, HSP12, and TPS2, transcript induction was impaired following heat shock or DNA damage treatment in the msn2-disrupted strain and was constitutively activated in a strain overexpressing MSN2. Furthermore, heat shock induction of a STRE-driven reporter gene was reduced more than 6-fold in the msn2 strain relative to wild-type cells. Taken together, these data indicate that Msn2p is the transcription factor that activates STRE-regulated genes in response to stress. Whereas nearly 85% of STRE-mediated heat shock induction was MSN2 dependent, there was significant MSN2-independent expression. We present evidence that the MSN2 homolog, MSN4, can partially replace MSN2 for transcriptional activation following stress. Moreover, our data provides evidence for the involvement of additional transcription factors in the yeast multistress response.
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PMID:Msn2p, a zinc finger DNA-binding protein, is the transcriptional activator of the multistress response in Saccharomyces cerevisiae. 865 Jan 68