The glucocorticoid receptor binds to defined nucleotide sequences near the promoter of mouse mammary tumour virus
- PMID: 6310405
- DOI: 10.1038/304749a0
The glucocorticoid receptor binds to defined nucleotide sequences near the promoter of mouse mammary tumour virus
Abstract
Glucocorticoids are known to induce the transcription of integrated proviral mouse mammary tumour virus (MMTV) genes in a variety of cell lines derived from mouse mammary tumours. Chimaeric genes in which selectable markers are linked to the long terminal repeat (LTR) region of MMTV can be induced by the synthetic glucocorticoid dexamethasone after introduction into mouse fibroblasts. This suggests that the regulatory elements required for hormonal induction are located within the cloned LTR fragments. The idea is supported by the observation that glucocorticoid receptors bind to certain cloned fragments of MMTV DNA in vitro. Using filter binding studies and monoclonal antibodies to the glucocorticoid receptor we have now delimited the receptor binding region to a DNA segment of 152 base pairs (bp) that has been shown to be relevant for hormonal induction. In nuclease protection experiments we have identified partially homologous receptor binding sequences located in this region, all of which share the hexanucleotide 5'-TGTTCT-3'.
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