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J Virol, April 1998, p. 2975-2982, Vol. 72, No. 4
0022-538X/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Adenovirus Type 5 E4 Open Reading Frame 4 Protein Induces Apoptosis in Transformed Cells

Ronit Shtrichman and Tamar Kleinberger*

Unit of Molecular Microbiology, The B. Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel

Received 28 August 1997/Accepted 12 December 1997

Adenovirus type 5 E4 open reading frame 4 (E4orf4) protein has been previously shown to counteract transactivation of the junB and c-fos genes by cyclic AMP plus E1A protein and to interact with protein phosphatase 2A (PP2A). Here, we show that the wild-type E4orf4 protein induces apoptosis in the E1A-expressing 293 cells, in NIH 3T3 cells transformed with v-Ras, and in the lung carcinoma cell line H1299. The induction of apoptosis is not accompanied by enhanced levels of p53 in 293 cells and occurs in the absence of p53 in H1299 cells, indicating involvement of a p53-independent pathway. A mutant E4orf4 protein that had lost the ability to induce apoptosis also lost its ability to bind PP2A. We suggest that E4orf4 antagonizes continuous signals to proliferate, like those given by E1A or v-Ras, and that the conflicting signals lead to the induction of cell death.

* Corresponding author. Mailing address: Unit of Molecular Microbiology, The B. Rappaport Faculty of Medicine, Technion, Haifa 31096, Israel. Phone: 972-4-829-5257. Fax: 972-4-829-5225. E-mail: tamark{at}tx.technion.ac.il.




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