Nucleic Acids Research, 2001, Vol. 29, No. 16 3424-3432
© 2001 Oxford University Press
Differential transcription of the orphan receptor RORß in nuclear extracts derived from Neuro2A and HeLa cells
Department of Molecular Biology, NCMLS, University of Nijmegen, Geert Grooteplein Zuid 26, 6525 GA Nijmegen, The Netherlands
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 RORß (NR1F2) and compared them with the retinoic acid receptor heterodimer RXR
RAR
(NR2B1NR1B1) and GalVP16 in vitro. Although RORß 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, RXR
RAR
and the acidic transcription factor GalVP16 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.
* To whom correspondence should be addressed. Tel: +31 24 36 10524; Fax: +31 24 36 10520; Email: stunnenb{at}sci.kun.nl
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