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Mol Cell Biol. 1993 January; 13(1): 57-62

MCM1 binds to a transcriptional control element in Ty1.

Department of Chemistry, University of North Carolina, Chapel Hill 27599.

ABSTRACT

Some Ty1 transposable-element insertion mutations of Saccharomyces cerevisiae activate adjacent-gene expression. These Ty1-activated genes are regulated similarly to certain mating genes. This report shows that the MCM1 protein, which binds to several mating genes, also binds to a transcriptional regulatory sequence in Ty1. The binding of MCM1 to Ty1 correlates with the ability of its binding site to function as a component of the Ty1 transcriptional activator. This correlation supports the idea that MCM1 is important for Ty1-activated gene expression. At mating-gene promoters, MCM1 binds with coactivators or repressors such as STE12, alpha 1, or alpha 2. In contrast, MCM1 binds without these associated DNA-binding proteins at its site in Ty1. This finding suggests that its role in Ty1-mediated transcription is different from that at mating genes.

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