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Abstract
A computer search of the pBR322 DNA sequence identified five sites matching reported glucocorticoid regulatory element (GRE) DNA consensus sequences and three related sites. A pBR322 DNA fragment containing one GRE site was shown to bind immobilized HeLa S3 cell glucocorticoid receptor and to compete for receptor binding in a competitive binding assay. Conversely, a pBR322 DNA fragment devoid of GRE sites showed barely detectable interaction with glucocorticoid receptor in either of these assays. These results demonstrate the importance of GRE consensus sequences in glucocorticoid receptor interactions with DNA, and further identify a cause for high background binding observed when pBR322 DNA is used as a negative control in studies of glucocorticoid receptor-DNA interactions.
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