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A GCN4 protein recognition element is not sufficient for GCN4-dependent regulation of transcription in the ARO7 promoter of Saccharomyces cerevisiae

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Summary

The gene AR07 encodes the monofunctional enzyme chorismate mutase, a branch point enzyme in the aromatic amino acid biosynthetic pathway in Saccharomyces cerevisiae. We investigated the transcription of the AR07 gene. Three 5′ ends at positions − 36, − 56 and − 73 and the 3′ end of the transcripts 146 bp downstream of the translational stop codon were mapped. As in the promoters of other aromatic amino acid biosynthetic genes, a recognition element for the GCN4 transcriptional activator of amino acid biosynthesis is located 425 base pairs (bp) upstream of the first transcriptional start point. This element binds GCN4 specifically in vitro. Northern analysis and determination of the specific enzyme activity reveals however, that the element is not sufficient to mediate transcriptional regulation by GCN4 in vivo. We thus suggest that in addition to a consensus sequence capable of binding the GCN4 protein other factors like, for example, chromatin structure, determine whether a recognition site for a transcription factor functions as an upstream activation sequence.

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Author notes

  1. Tobias Schmidheini

    Present address: Microsynth, Ankerstrasse 1, CH-5200, Windisch, Switzerland

Authors and Affiliations

  1. Mikrobiologisches Institut, Eidgenössische Technische Hochschule, ETH-Zentrum, Schmelzbergstrasse 7, CH-8092, Zürich, Switzerland

    Tobias Schmidheini, Hans-Ulrich Mösch, Roney Graf & Gerhard H. Braus

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  1. Tobias Schmidheini
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  2. Hans-Ulrich Mösch
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  3. Roney Graf
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  4. Gerhard H. Braus
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Communicated by H. Hennecke

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Schmidheini, T., Mösch, HU., Graf, R. et al. A GCN4 protein recognition element is not sufficient for GCN4-dependent regulation of transcription in the ARO7 promoter of Saccharomyces cerevisiae . Molec. Gen. Genet. 224, 57–64 (1990). https://doi.org/10.1007/BF00259451

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  • DOI: https://doi.org/10.1007/BF00259451

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