PMID- 8392705 OWN - NLM STAT- MEDLINE DCOM- 19930813 LR - 20190501 IS - 0305-1048 (Print) IS - 1362-4962 (Electronic) IS - 0305-1048 (Linking) VI - 21 IP - 11 DP - 1993 Jun 11 TI - The glucocorticoid receptor hormone binding domain mediates transcriptional activation in vitro in the absence of ligand. PG - 2673-81 AB - We show that recombinant rat glucocorticoid receptor (vvGR) expressed using vaccinia virus is indistinguishable from authentic GR with respect to DNA and hormone binding. In the absence of hormone, vvGR is mainly found in the cytoplasm in a complex with heat shock protein 90. Upon incubation with ligand, vvGR is released from this complex and translocated to the nucleus. Thus, the ligand binding domain displays the known biochemical properties. However, in vitro, transcription from a synthetic promoter and from the mouse mammary tumor virus (MMTV) promoter is enhanced by recombinant GR in a ligand independent manner. Both transactivation domains contribute to the transcriptional activity, additively on a synthetic promoter and cooperatively on the MMTV promoter. We thus provide the first evidence that in vitro the hormone binding domain has a transcriptional activity even in the absence of ligand. FAU - Schmitt, J AU - Schmitt J AD - European Molecular Biology Laboratory, Gene Expression Programme, Heidelberg, Germany. FAU - Stunnenberg, H G AU - Stunnenberg HG LA - eng PT - Journal Article PL - England TA - Nucleic Acids Res JT - Nucleic acids research JID - 0411011 RN - 0 (DNA-Binding Proteins) RN - 0 (Oligodeoxyribonucleotides) RN - 0 (Receptors, Glucocorticoid) RN - 0 (Recombinant Proteins) RN - F446C597KA (Triamcinolone Acetonide) SB - IM MH - Amino Acid Sequence MH - Animals MH - Base Sequence MH - DNA-Binding Proteins/isolation & purification/*metabolism MH - Gene Expression MH - HeLa Cells MH - Humans MH - Kinetics MH - Mammary Tumor Virus, Mouse/*genetics MH - Molecular Sequence Data MH - Oligodeoxyribonucleotides/*metabolism MH - *Promoter Regions, Genetic MH - Rats MH - Receptors, Glucocorticoid/isolation & purification/*metabolism MH - Recombinant Proteins/isolation & purification/metabolism MH - Templates, Genetic MH - *Transcription, Genetic MH - Transfection MH - Triamcinolone Acetonide/*metabolism MH - Vaccinia virus/genetics PMC - PMC309598 EDAT- 1993/06/11 00:00 MHDA- 1993/06/11 00:01 CRDT- 1993/06/11 00:00 PHST- 1993/06/11 00:00 [pubmed] PHST- 1993/06/11 00:01 [medline] PHST- 1993/06/11 00:00 [entrez] AID - 10.1093/nar/21.11.2673 [doi] PST - ppublish SO - Nucleic Acids Res. 1993 Jun 11;21(11):2673-81. doi: 10.1093/nar/21.11.2673.