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The yeast co-activator GAL11 positively influences transcription of the phosphoglycerate kinase gene, but only when RAP1 is bound to its upstream activation sequence

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Abstract

Transcription of the yeast phosphoglycerate kinase gene (PGK) is activated by an array of nuclear factors including the multifunctional protein RAP1. We have demonstrated that the transcriptional co-activator GAL11, which was identified as an auxiliary factor to GAL4 and which is believed to interact with the zinc finger of the trans-activator, positively influences the level of PGK transcription on both fermentable and non-fermentable carbon sources. This positive effect is only observed when the RAP1 site in the upstream activation sequence (UAS) is present, implying that GAL11 acts through RAP1. Expression of the RAP1 gene is not reduced in the gal11 background, and in vivo footprinting shows that GAL11 does not influence RAP1 DNA-binding activity. Therefore the effect of GAL11 on PGK transcription must be mediated at the PGK UAS, presumably as part of the activation complex. It has been proposed that RAP1 may act as a facilitator of GCR1 binding at the PGK UAS and therefore it is conceivable that the target for GAL11 may in fact be GCR1. A further implication of this study is that GAL11 can interact with proteins such as RAP1 or GCR1 that are apparently structurally dissimilar from GAL4 and other zinc finger DNA-binding proteins.

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Authors and Affiliations

  1. Department of Plant Sciences, University of Oxford, OX1 3RB, South Parks Road, Oxford, UK

    Clive A. Stanway & Jennifer M. Gibbs

  2. Department of Zoology, University of Oxford, South Parks Road, OX1 3PS, Oxford, UK

    Stephen E. Kearsey

  3. Department of Immunology and Medical Microbiology, University of Florida, College of Medicine, 32610-0266, Gainesville, FL, USA

    M. Cecilia López & Henry V. Baker

Authors
  1. Clive A. Stanway
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  2. Jennifer M. Gibbs
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  3. Stephen E. Kearsey
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  4. M. Cecilia López
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  5. Henry V. Baker
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Communicated by D. Thomas

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Stanway, C.A., Gibbs, J.M., Kearsey, S.E. et al. The yeast co-activator GAL11 positively influences transcription of the phosphoglycerate kinase gene, but only when RAP1 is bound to its upstream activation sequence. Molec. Gen. Genet. 243, 207–214 (1994). https://doi.org/10.1007/BF00280318

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  • DOI: https://doi.org/10.1007/BF00280318

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