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. 1995 Oct 2;14(19):4758–4762. doi: 10.1002/j.1460-2075.1995.tb00157.x

CBP-induced stimulation of c-Fos activity is abrogated by E1A.

A J Bannister 1, T Kouzarides 1
PMCID: PMC394573  PMID: 7588605

Abstract

The CBP protein stimulates transcription of cAMP-responsive genes by binding to the phosphorylated activation domain of the CREB transcription factor. Here we show that CBP stimulates transcription of Fos/Jun activity in F9 cells and that this response of mediated, at least partly, via c-Fos. We show that CBP binds c-Fos in a phosphorylation-independent manner in vitro, using a domain distinct from that required to bind CREB. When this CBP domain is linked to the activation domain of VP16 it can stimulate GAL4-Fos activity in vivo. The domain of CBP that binds c-Fos is also used to contact the E1A protein. We therefore asked whether the documented repression of AP1 activity by E1A is due to sequestration of CBP from c-Fos. We show that E1A 12S can repress c-Fos activation functions. The use of E1A mutants indicates that binding of CBP, but not RB, to E1A is essential for E1A-mediated repression. These data support a model whereby E1A can modulate AP1 activity by directly competing for the CBP co-activator protein.

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