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. 1997 Mar;17(3):1407–1416. doi: 10.1128/mcb.17.3.1407

The transcriptional integrator CREB-binding protein mediates positive cross talk between nuclear hormone receptors and the hematopoietic bZip protein p45/NF-E2.

X Cheng 1, M J Reginato 1, N C Andrews 1, M A Lazar 1
PMCID: PMC231865  PMID: 9032267

Abstract

Thyroid hormone (T3) and retinoic acid (RA) play important roles in erythropoiesis. We found that the hematopoietic cell-specific bZip protein p45/NF-E2 interacts with T3 receptor (TR) and RA receptor (RAR) but not retinoid X receptor. The interaction is between the DNA-binding domain of the nuclear receptor and the leucine zipper region of p45/NF-E2 but is markedly enhanced by cognate ligand. Remarkably, ligand-dependent transactivation by TR and RAR is markedly potentiated by p45/NF-E2. This effect of p45/NF-E2 is prevented by maf-like protein p18, which functions positively as a heterodimer with p45/NF-E2 on DNA. Potentiation of hormone action by p45/NF-E2 requires its activation domain, which interacts strongly with the multifaceted coactivator cyclic AMP response element protein-binding protein (CBP). The region of CBP which interacts with p45/NF-E2 is the same interaction domain that mediates inhibition of hormone-stimulated transcription by AP1 transcription factors. Overexpression of the bZip interaction domain of CBP specifically abolishes the positive cross talk between TR and p45/NF-E2. Thus, positive cross talk between p45/NF-E2 and nuclear hormone receptors requires direct protein-protein interactions between these factors and with CBP, whose integration of positive signals from two transactivation domains provides a novel mechanism for potentiation of hormone action in hematopoietic cells.

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Selected References

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