Shtrichman, Ronit and Sharf, Rakefet and Barr, Haim and Dobner, Thomas and Kleinberger, Tamar (1999) Induction of apoptosis by adenovirus E4orf4 protein is specific to transformed cells and requires an interaction with protein phosphatase 2A. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, 96 (18). pp. 10080-10085. ISSN 0027-8424,
Full text not available from this repository. (Request a copy)Abstract
We previously have shown that adenovirus type 5 E4orf4 protein associates with protein phosphatase 2A (PP2A) and induces apoptosis in transformed cells in a p53-independent manner, Here me show that the interaction between E4orf4 and PP2A is required for induction of apoptosis by the viral protein. This conclusion is supported by a mutation analysis of E4orf4 protein, showing a correlation between the ability to bind PP2A and to induce apoptosis, and by the observation that transfection of an antisense construct of the PP2A-B55 subunit reduces expression of the PP2A-B55 subunit and inhibits induction of apoptosis by E4orf4, but not by p53. The mutant analysis also indicates that even a low level of interaction with PP2A is sufficient to initiate the E4orf4 apoptotic pathway, In addition, E4orf4 inhibits cellular transformation by various oncogenes, and this function is coupled to its ability to induce apoptosis, Furthermore, expression of oncogenes in primary cell cultures sensitizes these cells to induction of apoptosis by E4orf4. Our results suggest that E4orf4 is a potentially useful tool for cancer gene therapy.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | TRANSCRIPTION; DNA; PHOSPHORYLATION; SUBUNITS; TYPE-5; DEATH; LINE; TRANSACTIVATION; FEATURES; ANTIGENS; |
| Subjects: | 600 Technology > 610 Medical sciences Medicine |
| Divisions: | Medicine > Lehrstuhl für Medizinische Mikrobiologie und Hygiene |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 11 Jan 2023 07:09 |
| Last Modified: | 11 Jan 2023 07:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49061 |
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