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We demonstrate here that the E2F1 induced by DNA damage can bind to and promote the apoptotic function of p53 via the cyclin A binding site of E2F1. This function of E2F1 does not require its DP-1 binding, DNA binding, or transcriptional activity and is independent of mdm2. All the cyclin A binding E2F family members can interact and cooperate with p53 to induce apoptosis. This suggests a novel role for E2F in regulating apoptosis in response to DNA damage. Cyclin A, but not cyclin E, prevents E2F1 from interacting and cooperating with p53 to induce apoptosis. However, in response to DNA damage, cyclin A levels decrease, with a concomitant increase in E2F1-p53 complex formation. These results suggest that the binding of E2F1 to p53 can specifically stimulate the apoptotic function of p53 in response to DNA damage.

Type

Journal article

Journal

Mol Cell Biol

Publication Date

01/2002

Volume

22

Pages

78 - 93

Keywords

Apoptosis, Binding Sites, Cell Cycle Proteins, Cell Separation, Cyclin A, DNA Damage, DNA-Binding Proteins, E2F Transcription Factors, E2F1 Transcription Factor, Flow Cytometry, Humans, Neoplasm Proteins, Nuclear Proteins, Precipitin Tests, Protein Binding, Protein Structure, Tertiary, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-bcl-2, Proto-Oncogene Proteins c-mdm2, Transcription Factors, Tumor Cells, Cultured, Tumor Suppressor Protein p53, Ultraviolet Rays, bcl-2-Associated X Protein