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Identification of a Ty1 regulatory sequence responsive to STE7 and STE12.

Department of Chemistry, University of North Carolina, Chapel Hill 27514.

ABSTRACT

Ty1 activation of gene expression observed in haploid cell types of Saccharomyces cerevisiae requires the STE7 and STE12 gene products. An activator sequence within Ty1 that is responsive to these two regulators has been defined. Complex formation between a factor in whole-cell extracts and the DNA regulatory element showed the same dependence on the STE7 and STE12 gene products as did reporter gene expression. Base pair substitutions within the binding site abolished the ability to form the factor-DNA complex and to activate gene expression. The correlation between complex formation and reporter gene expression indicates that factor binding to the cis-acting element is essential for gene activation. Because the predicted protein for the STE7 gene product is homologous to protein kinases, we suggest that protein phosphorylation may directly or indirectly regulate formation of this DNA-protein complex.

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