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. 1998 Aug 1;26(15):3577–3583. doi: 10.1093/nar/26.15.3577

Assessment of aryl hydrocarbon receptor complex interactions using pBEVY plasmids: expressionvectors with bi-directional promoters for use in Saccharomyces cerevisiae.

C A Miller 3rd 1, M A Martinat 1, L E Hyman 1
PMCID: PMC147745  PMID: 9671822

Abstract

The pBEVY (bi-directional expression vectors for yeast) plasmids were designed with constitutive and galactose-induced bi-directional promoters to direct the expression of multiple proteins in Saccharomyces cerevisiae . Using human estrogen receptor as a test gene, relatively balanced expression levels from each side of a bi-directional promoter were observed. Expression of a functional heterodimeric transcription factor composed of human aryl hydrocarbon receptor (Ahr) and aryl hydrocarbon receptor nuclear translocator (Arnt) proteins was accomplished using a single pBEVY plasmid. Previous studies suggest that inhibitory cross-talk between the estrogen receptor and the Ahr/Arnt complex may occur and that Hsp90-Ahr complex formation is important for Ahr-mediated signal transduction. Evidence for functional interaction among these proteins was investigated using pBEVY plasmids in a yeast system. No inhibitory cross-talk was observed in signaling assays performed with yeast that co-expressed Ahr, Arnt and estrogen receptor. In contrast, Ahr/Arnt-mediated signal transduction was reduced by 80% in a temperature-sensitive Hsp90 strain grown under non-permissive conditions. We conclude that pBEVY plasmids facilitate the examination of multiple protein interactions in yeast model systems.

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