Expression of the human aryl hydrocarbon receptor complex in yeast. Activation of transcription by indole compounds - PubMed (original) (raw)
. 1997 Dec 26;272(52):32824-9.
doi: 10.1074/jbc.272.52.32824.
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- PMID: 9407059
- DOI: 10.1074/jbc.272.52.32824
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Expression of the human aryl hydrocarbon receptor complex in yeast. Activation of transcription by indole compounds
C A Miller 3rd. J Biol Chem. 1997.
Free article
Abstract
The human aryl hydrocarbon receptor (AHR) and aryl hydrocarbon receptor nuclear translocator protein (ARNT) were coexpressed in the yeast Saccharomyces cerevisiae to create a system for the study of this heterodimeric transcription factor. Specific transcriptional activation mediated by AHR/ARNT heterodimer, which is a functional indicator of receptor expression, was assessed by beta-galactosidase activity produced from a reporter plasmid. Yeast expressing AHR and ARNT displayed constitutive transcriptional activity that was not augmented by addition of AHR agonists in strains that required exogenous tryptophan for viability. In contrast, strains with an intact pathway for tryptophan biosynthesis responded to AHR agonists and had lower levels of background beta-galactosidase activity. Hexachlorobenzene, benzo(a)pyrene, and beta-naphthoflavone were effective AHR agonists in the yeast system, and had EC50 values of 200, 40, and 20 nM, respectively, for beta-galactosidase activity induction. Tryptophan, indole, indole acetic acid, and tryptamine activated transcription in yeast coexpressing AHR and ARNT (EC50 values approximately 300 microM). Indole-3-carbinol was an exceptionally potent AHR agonist (EC50 approximately 10 microM) in yeast. This yeast system is useful for the study of AHR/ARNT protein complexes, and may be generally applicable to the investigation of other multiprotein complexes.
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