title: Differential transcription of the orphan receptor RORbeta in nuclear extracts derived from Neuro2A and HeLa cells.
abstract: An important model system for studying the process leading to productive transcription is provided by the superfamily of nuclear receptors, which are for the most part ligand-controlled transcription factors. Over the past years several 'orphan' nuclear receptors have been isolated for which no ligand has yet been identified. Very little is known about how these 'orphan' receptors regulate transcription. In this study we have analysed the biochemical and transcriptional properties of the neuronally expressed orphan nuclear receptor RORbeta (NR1F2) and compared them with the retinoic acid receptor heterodimer RXRalpha-RARalpha (NR2B1-NR1B1) and Gal-VP16 in vitro. Although RORbeta binds to its DNA-binding sites with comparatively low affinity, it efficiently directs transcription in nuclear extracts derived from a neuronal cell line, Neuro2A, but not in nuclear extracts from non-neuronal HeLa cells. In contrast, RXRalpha-RARalpha and the acidic transcription factor Gal-VP16 support transcription in Neuro2A and HeLa nuclear extracts equally efficiently. These observations point to a different (co)factor requirement for transactivation by members of the NR1 subfamily of nuclear receptors.
authors.affiliation: Department of Molecular Biology, NCMLS, University of Nijmegen, Geert Grooteplein Zuid 26, 6525 GA Nijmegen, The Netherlands.
authors.forename: K
authors.initials: K
authors.lastname: Gawlas
authors.forename: H G
authors.initials: HG
authors.lastname: Stunnenberg
mesh_terms: D001483:Base Sequence; D001665:Binding Sites; D002457:Cell Extracts; D002467:Cell Nucleus / Q000378:metabolism*; D004247:DNA / Q000235:genetics / Q000378:metabolism; D019281:Dimerization; D005786:Gene Expression Regulation; D005822:Genetic Vectors / Q000235:genetics; D006367:HeLa Cells; D017405:Herpes Simplex Virus Protein Vmw65 / Q000378:metabolism; D006801:Humans; D009474:Neurons / Q000166:cytology / Q000378:metabolism*; D057095:Nuclear Receptor Subfamily 1, Group F, Member 2; D011485:Protein Binding; D011956:Receptors, Cell Surface / Q000235:genetics / Q000378:metabolism*; D018160:Receptors, Cytoplasmic and Nuclear; D018168:Receptors, Retinoic Acid / Q000378:metabolism; D020218:Response Elements / Q000235:genetics; D047488:Retinoid X Receptors; D013816:Thermodynamics; D014157:Transcription Factors / Q000378:metabolism; D014158:Transcription, Genetic / Q000235:genetics*; D015533:Transcriptional Activation; D014407:Tumor Cells, Cultured; D014616:Vaccinia virus / Q000235:genetics
chemical_list: D002457:Cell Extracts; D017405:Herpes Simplex Virus Protein Vmw65; D057095:Nuclear Receptor Subfamily 1, Group F, Member 2; C539740:RORB protein, human; D011956:Receptors, Cell Surface; D018160:Receptors, Cytoplasmic and Nuclear; D018168:Receptors, Retinoic Acid; D047488:Retinoid X Receptors; D014157:Transcription Factors; D004247:DNA