Sequence Requirements for Estrogen Receptor Binding to Estrogen Response Elements*

The estrogen receptor (ER) is a transcription factor that binds to a specific DNA sequence found in the regulatory regions of estrogen-responsive genes, called the estrogen response element (ERE). Many genes that contain EREs have been identified, and most of these EREs contain one or more changes from the core consensus sequence, a 13-nucleotide segment with 10 nucleotides forming an inverted repeat. A number of genes have multiple copies of these imperfect EREs. In order to understand why natural EREs have developed in this manner, we have attempted to define the basic sequence requirements for ER binding. To this end, we measured the binding of homodimeric ER to a variety of nonconsensus EREs. We discovered that an ERE containing even a single change from the consensus may be unable to bind ER. However, an ERE with two changes from the consensus may be capable of binding avidly to ER in the context of certain flanking sequences. We found that changes in the sequences flanking a nonconsensus ERE can greatly alter ER-ERE affinity, either positively or negatively. Careful study of sequences flanking a series of EREs made it possible to develop rules that predict whether ER binds to a given natural ERE and also to predict the relative amounts of binding when comparing two EREs.

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