RGD Reference Report - Mechanistic principles in NR box-dependent interaction between nuclear hormone receptors and the coactivator TIF2. - Rat Genome Database

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Mechanistic principles in NR box-dependent interaction between nuclear hormone receptors and the coactivator TIF2.

Authors: Leers, J  Treuter, E  Gustafsson, JA 
Citation: Leers J, etal., Mol Cell Biol 1998 Oct;18(10):6001-13.
RGD ID: 633360
Pubmed: PMID:9742117   (View Abstract at PubMed)
PMCID: PMC109186   (View Article at PubMed Central)

Nuclear hormone receptors exert transcriptional activation of target genes upon hormone induction via interactions with the basal transcription machinery. This interaction is mediated by cofactors which physically bind to receptors, thereby acting as coactivators or corepressors leading to activation or repression, respectively. Here we report the screening for and cloning of a peroxisome proliferator receptor-interacting protein, the rat homolog of TIF2. By sequence comparison with the related coactivator SRC-1, we identified three short conserved motifs (NR boxes) in both proteins which are the putative binding sites of TIF2 to nuclear hormone receptors. We demonstrate here by generation of amino acid exchanges within the NR boxes that all three boxes located in the receptor interaction domain of TIF2 are necessary and sufficient for interaction. The three boxes individually can bind to hormone receptors but display preferences in binding for certain receptors. In addition, we show that the interaction domain of TIF2 can compete with other AF-2-dependent cofactors for binding to receptors. Finally, we demonstrate cooperative binding of two TIF2 molecules to a heterodimeric nuclear receptor complex even in the presence of only one cognate ligand, indicating an allosteric effect on the heterodimeric partner upon coactivator binding.

Gene Ontology Annotations    Click to see Annotation Detail View

Molecular Function

Objects Annotated

Genes (Rattus norvegicus)
Ncoa2  (nuclear receptor coactivator 2)
Rxra  (retinoid X receptor alpha)


Additional Information