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A CBP integrator complex mediates transcriptional activation and AP-1 inhibition by nuclear receptors.

Kamei Y., Xu L., Heinzel T., Torchia J., Kurokawa R., Gloss B., Lin S.-C., Heyman R.A., Rose D.W., Glass C.K., Rosenfeld M.G.

Nuclear receptors regulate gene expression by direct activation of target genes and inhibition of AP-1. Here we report that, unexpectedly, activation by nuclear receptors requires the actions of CREB-binding protein (CBP) and that inhibition of AP-1 activity is the apparent result of competition for limiting amounts of CBP/p300 in cells. Utilizing distinct domains, CBP directly interacts with the ligand-binding domain of multiple nuclear receptors and with the p160 nuclear receptor coactivators, which upon cloning have proven to be variants of the SRC-1 protein. Because CBP represents a common factor, required in addition to distinct coactivators for function of nuclear receptors, CREB, and AP-1, we suggest that CBP/p300 serves as an integrator of multiple signal transduction pathways within the nucleus.

Cell 85:403-414(1996) [PubMed] [Europe PMC]

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