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. 1985 Aug;5(8):1901–1909. doi: 10.1128/mcb.5.8.1901

Suppressors of Saccharomyces cerevisiae his3 promoter mutations lacking the upstream element.

M A Oettinger, K Struhl
PMCID: PMC366906  PMID: 3018536

Abstract

Transcription of the Saccharomyces cerevisiae his3 gene requires an upstream promoter element and a TATA element. A strain containing his3-delta 13, an allele which deletes the upstream promoter element but contains the TATA box and intact structural gene, fails to express the gene and consequently is unable to grow in medium lacking histidine. In this paper we characterize His+ revertants of his3-delta 13 which are due to unlinked suppressor mutations. Recessive suppressors in three different ope genes allow his3-delta 13 to be expressed at wild-type levels. In all cases, the suppression is due to increased his3 transcription. However, unlike the wild-type his3 gene, whose transcripts are initiated about equally from two different sites (+1 and +12), transcription due to the ope mutations is initiated only from the +12 site, ope-mediated transcription is regulated in a novel manner; it is observed in minimal medium, but not in rich broth. Although ope mutations restore wild-type levels of transcription, his3 chromatin structure, as assayed by micrococcal nuclease sensitivity of the TATA box, resembles that found in the his3-delta 13 parent rather than in the wild-type strain. This provides further evidence that TATA box sensitivity is not correlated with transcriptional activation. ope mutations are pleiotropic in that cells have a crunchy colony morphology and lyse at 37 degrees C in conditions of normal osmolarity. ope mutations are allele specific because they fail to suppress five other his3 promoter mutations. We discuss implications concerning upstream promoter elements and propose some models for ope suppression.

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