Abstract：
:Steroid hormone receptors are a class of cell-specific trans-acting transcription regulatory factors whose activity is controlled by specific binding of the hormone. The hormone-receptor complex appears to associate with promoter/enhancer elements of specific target genes, resulting in activation of transcription (see refs 1 and 2 for reviews). Sequence comparison between the oestrogen, glucocorticoid and progesterone receptors (refs 7, 8 and unpublished results) and site-directed mutation analysis, has identified in each at least two functional domains important for steroid receptor function. Region E (Fig. 1a), is the hormone-binding domain; region C is a 66-amino-acid region (Figs 1a,b) that is more highly conserved than the hormone-binding domain and has the potential to form at least two zinc-stabilized 'DNA-binding fingers' analogous to those proposed for the Xenopus transcription factor TFIIIA. We and others have suggested that this region may be the receptor's DNA-binding domain. We show here that point mutations replacing two cysteines by two histidines in the first potential DNA-binding finger of the human oestrogen receptor (hER) prevent it from activating gene transcription. We further show that a chimaeric receptor formed by replacing this 66-amino-acid region of the hER with that of the human glucocorticoid receptor (hGR) activates expression of a glucocorticoid-inducible gene, but not of an oestrogen-inducible gene, in the presence of oestradiol. Thus, region C determines the receptor's specificity for target genes.
journal_name
Naturejournal_title
Natureauthors
Green S,Chambon Pdoi
10.1038/325075a0subject
Has Abstractpub_date
1987-01-01 00:00:00pages
75-8issue
6099eissn
0028-0836issn
1476-4687journal_volume
325pub_type
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