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. 1991 Dec;11(12):5910–5918. doi: 10.1128/mcb.11.12.5910

Properties of the DNA-binding domain of the Saccharomyces cerevisiae STE12 protein.

Y L Yuan 1, S Fields 1
PMCID: PMC361741  PMID: 1944269

Abstract

The STE12 protein of the yeast Saccharomyces cerevisiae binds to the pheromone response element (PRE) present in the upstream region of genes whose transcription is induced by pheromone. Using DNase I footprinting assays with bacterially made STE12 fragments, we localized the DNA-binding domain to 164 amino acids near the amino terminus. Footprinting of oligonucleotide-derived sequences containing one PRE, or two PREs in head-to-tail or tail-to-tail orientation, showed that the N-terminal 215 amino acids of STE12 has similar binding affinity to either of the dimer sites and a binding affinity 5- to 10-fold lower for the monomer site. This binding cooperativity was also evident on a fragment from the MFA2 gene, which encodes the a-factor pheromone. On this fragment, the 215-amino-acid STE12 fragment protected both a consensus PRE as well as a degenerate PRE containing an additional residue. Mutation of the degenerate site led to a 5- to 10-fold decrease in binding; mutation of the consensus site led to a 25-fold decrease in binding. The ability of PREs to function as pheromone-inducible upstream activation sequences in yeast correlated with their ability to bind the STE12 domain in vitro. The sequence of the STE12 DNA-binding domain contains similarities to the homeodomain, although it is highly diverged from other known examples of this motif. Moreover, the alignment between STE12 and the homeodomain postulates loops after both the putative helix 1 and helix 2 of the STE12 sequence.

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Selected References

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