Co-operative binding of the glucocorticoid receptor DNA binding domain is one of at least two mechanisms for synergism
- PMID: 1960719
- DOI: 10.1016/0022-2836(91)90202-h
Co-operative binding of the glucocorticoid receptor DNA binding domain is one of at least two mechanisms for synergism
Abstract
Steroid induction of responsive genes functions through the synergistic activity of steroid receptor binding sequences with adjacent binding sites either for other transcription factors or for further steroid receptors. Analysis of the human glucocorticoid receptor revealed that the DNA-binding domain of the receptor is sufficient to mediate co-operative binding to adjacent receptor binding sites. This is a novel feature of the domain in addition to its DNA-binding, trans-activating and trans-repressing properties. Chimaeric proteins containing the N- or C-terminal receptor halves fused to the GAL4 DNA-binding domain do not co-operate in DNA-binding, however they do functionally synergize. Thus, at least two mechanisms contribute to the synergism of the human glucocorticoid receptor bound to two adjacent receptor binding sites.
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