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A region in the steroid binding domain determines formation of the non-DNA-binding, 9 S glucocorticoid receptor complex


A region in the steroid binding domain determines formation of the non-DNA-binding, 9 S glucocorticoid receptor complex



Journal of Biological Chemistry 263(1): 267-273



ISSN/ISBN: 0021-9258

PMID: 3335498

This work was initiated to determine if a specific region of the glucocorticoid receptor determines the formation of the inactive (i.e. non-DNA-binding) 9 S form of the receptor recovered in cytosol preparations. It is known that the murine glucocorticoid receptor of the nti phenotype, which consists of only the carboxyl-terminal 40-kDa peptide containing the DNA-binding and steroid-binding domains separated by a short linker region, is recovered in hypotonic lysates as a 9 S heteromeric complex (Gehring, U., and Arndt, H. (1985) FEBS Lett. 179, 138-142). To further localize the domain required for formation of the 9 S complex, we have determined the sedimentation coefficients of receptors produced in COS-7 cells transfected with several mutants of the human glucocorticoid receptor gene. Deletion of the DNA-binding domain results in a 9 S complex that is somewhat less stable than the wild type receptor during sucrose gradient centrifugation. Deletion of the linker region yields a molybdate-stabilized 9 S complex, but deletion of the entire steroid-binding domain or internal deletion of the amino-terminal two-thirds of this domain yields receptors that are constitutive transcriptional activators and are present in cytosol only in the 4 S form. Taken together, these observations demonstrate that the steroid-binding domain contains the features required for formation of the 9 S heteromeric complex, and they are consistent with the proposal that the steroid-binding domain normally represses receptor function.

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Accession: 039108590

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