Journal
MOLECULAR AND CELLULAR BIOLOGY
Volume 25, Issue 16, Pages 7375-7385Publisher
AMER SOC MICROBIOLOGY
DOI: 10.1128/MCB.25.16.7375-7385.2005
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Funding
- NIEHS NIH HHS [T32 ES07075, T32 ES007075] Funding Source: Medline
- NIGMS NIH HHS [T32 GM007232, 5 T32 GM07232, R01 GM035827] Funding Source: Medline
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Genes encoding biosynthetic enzymes that make ergosterol, the major fungal membrane sterol, are regulated, in part, at the transcriptional level. Two transcription factors, Upc2p and Ecm22p, bind to the promoters of most ergosterol biosynthetic (ERG) genes, including ERG2 and ERG3, and activate these genes upon sterol depletion. We have identified the transcriptional activation domains of Upc2p and Ecm22p and found that UPC2-1, a mutation that allows cells to take up sterols aerobically, increased the potency of the activation domain. The equivalent mutation in ECM22 also greatly enhanced transcriptional activation. The C-terminal regions of Upc2p and Ecm22p, which contained activation domains, also conferred regulation in response to sterol levels. Hence, the activation and regulatory domains of these proteins overlapped. However, the two proteins differed markedly in how they respond to an increased need for sterols. Upon inducing conditions, Upc2p levels increased, and chromatin immunoprecipitation experiments revealed more Upc2p at promoters even when the activation/regulatory domains were tethered to a different DNA-binding domain. However, induction resulted in decreased Ecm22p levels and a corresponding decrease in the amount of Ecm22p bound to promoters. Thus, these two activators differ in their contributions to the regulation of their targets.
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