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Reference: Kim DH, et al. (2008) Functional conservation of the glutamine-rich domains of yeast Gal11 and human SRC-1 in the transactivation of glucocorticoid receptor Tau 1 in Saccharomyces cerevisiae. Mol Cell Biol 28(3):913-25

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Abstract

The yeast Gal11 protein, a component of the Mediator complex, is required for the transcriptional activation of many class II genes as a physiological target of various activator proteins in vivo. In this study, we identified the yeast Mediator complex as a novel coactivator of the transcriptional activity of the glucocorticoid receptor (GR) tau 1 (tau1), the major transcriptional activation domain of the GR. GR tau1 directly interacted with the Mediator complex in vivo and in vitro in a Gal11 module-dependent manner and the Gal11p subunit interacted directly with GR tau1. Specific amino acid residues within the glutamine rich (Qr) domain of Gal11p (residues 116-277) were essential for its interaction with GR tau1 and GR tau1 transactivity in yeast, as demonstrated by mutational analysis of Gal11 Qr domain which is highly conserved among human steroid receptor coactivator (SRC) proteins. A Gal11p variant, mini-Gal11p, comprised of the Mediator-association and Qr domains of Gal11p, or chimeric mini-Gal11p containing the Qr domain of SRC-1, could potentiate the GR tau1 transactivity in a gal11Delta yeast strain. These results suggest that there is functional conservation between Qr domains of yeast Gal11p and mammalian SRC proteins as direct targets of activator proteins in yeast.

Reference Type
Journal Article
Authors
Kim DH, Kim GS, Yun CH, Lee YC
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