CBP/p300 integrates Raf/Rac-signaling pathways in the transcriptional induction of NF-ATc during T cell activation
- PMID: 10367897
- DOI: 10.1016/s1074-7613(00)80051-5
CBP/p300 integrates Raf/Rac-signaling pathways in the transcriptional induction of NF-ATc during T cell activation
Abstract
NF-ATc, an inducibly expressed transcription factor, controls gene expression in T lymphocytes and cardiomyocytes. We show here that the transcriptional co-activators CBP/p300 bind to and control the activity of the inducible N-terminal transactivation domain of NF-ATc, TAD-A. Similar to the N terminal transactivation domain of c-Jun, TAD-A is inducibly phosphorylated, but this phosphorylation is dispensable for the interaction with CBP/p300. Constitutive active versions of c-Raf and Rac synergistically enhance the CBP/p300-mediated increase of TAD-A activity, indicating the important role CBP/p300 plays in the integration of T cell activation signals. Since a mutation of CBP abolishing HAT activity is almost as active as wild-type CBP in T cells, functions of CBP/p300 other than histone acetylation appear to control the NF-AT-dependent transcription in T cells.
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