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Molecular and Cellular Biology, January 2002, p. 78-93, Vol. 22, No. 1
0270-7306/01/$04.00+0     DOI: 10.1128/MCB.22.1.78-93.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Novel Function of the Cyclin A Binding Site of E2F in Regulating p53-Induced Apoptosis in Response to DNA Damage

Jung-Kuang Hsieh, Damian Yap, Daniel J. O’Connor, Valentina Fogal, Lynn Fallis, Florence Chan, Shan Zhong, and Xin Lu*

Ludwig Institute for Cancer Research, Imperial College School of Medicine, London W2 1PG, United Kingdom

Received 6 April 2001/ Returned for modification 16 May 2001/ Accepted 19 September 2001

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.

* Corresponding author. Mailing address: Ludwig Institute for Cancer Research, Imperial College School of Medicine, St. Mary’s Campus, Norfolk Place, London W2 1PG, United Kingdom. Phone: 44 2075 637710. Fax: 44 2077 248586. E-mail: x.lu{at}ic.ac.uk.

Molecular and Cellular Biology, January 2002, p. 78-93, Vol. 22, No. 1
0022-538X/01/$04.00+0     DOI: 10.1128/MCB.22.1.78-93.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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