PMID: 9168467May 1, 1997Paper

A role for HDJ-2/HSDJ in correcting subnuclear trafficking, transactivation, and transrepression defects of a glucocorticoid receptor zinc finger mutant

Molecular Biology of the Cell
Y TangD B DeFranco

Abstract

All steroid receptors possess a bipartite nuclear localization signal sequence (NLS) that localizes within the second zinc finger of their DNA-binding domain. Fine-structure mapping of the rat glucocorticoid receptor (rGS) NLS identified a composite signal composed of three distinct proto-NLSs that function effectively when present in unique pairs. At least one of the rGR proto-NLSs appears to influence receptor trafficking within the nucleus, as revealed by a unique nuclear staining pattern of receptors possessing a point mutation (i.e., arginine at position 496; R496), at proto-NLS, pNLS-2. Specifically, carboxyl-terminal-truncated rGRs possessing various point mutations at R496 localized within a limited number of large foci in nuclei of transiently transfected COS-1 cells. R496 mutations did not affect subnuclear targeting when present in full-length rGR, reflecting a protective effect of the receptor's ligand-binding domain that can be exerted in cis and in trans. The effects of rGR R496 mutations on subnuclear targeting were not autonomous because we also observed a coincident localization of hsp70, the 70-kDa heat shock protein, within nuclear foci that include r496 mutant receptors. The elimination of R496 mistargeting ...Continue Reading

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Apr 1, 1999·Cell Biochemistry and Biophysics·D B DeFranco
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