A family of transcriptional adaptor proteins targeted by the E1A oncoprotein

Nature. 1995 Mar 2;374(6517):81-4. doi: 10.1038/374081a0.


The cellular protein p300 is a target of the adenoviral E1A oncoprotein and is thought to participate in preventing the G0/G1 transition in the cell cycle, activating certain enhancers and stimulating differentiation pathways. CBP is a protein that is associated with and coactivates the transcription factor CREB, mediating the induction by cyclic AMP of certain responsive promoters. The sequences of p300 and CBP are highly related. We show here that p300, like CBP2, can stimulate transcription. This activity is directly and specifically inhibited by E1A. We also find that CBP exists in a DNA-bound complex containing a member of the CREB family and that E1A and CBP interact with one another in vivo. In keeping with the idea that E1A functionally targets CBP, cAMP-dependent transcription is repressed by E1A. Thus, p300 and CBP define a family of transcriptional adaptor proteins that are specifically targeted by the E1A oncoprotein.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adenovirus E1A Proteins / metabolism*
  • CREB-Binding Protein
  • Cyclic AMP / metabolism
  • DNA / metabolism
  • Humans
  • Nuclear Proteins / metabolism*
  • Protein Binding
  • Recombinant Fusion Proteins / metabolism
  • Trans-Activators*
  • Transcription Factors / metabolism*
  • Transcriptional Activation*
  • Transfection
  • Tumor Cells, Cultured


  • Adenovirus E1A Proteins
  • Nuclear Proteins
  • Recombinant Fusion Proteins
  • Trans-Activators
  • Transcription Factors
  • DNA
  • Cyclic AMP
  • CREB-Binding Protein
  • CREBBP protein, human