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Mol. Cell. Biol., May 1996, 2101-2109, Vol 16, No. 5
Copyright © 1996, American Society for Microbiology

Adenovirus E1A proteins inhibit activation of transcription by p53

WT Steegenga, T van Laar, N Riteco, A Mandarino, A Shvarts, AJ van der Eb and AG Jochemsen
Laboratory of Molecular Carcinogenesis, Sylvius Laboratories, Leiden University, The Netherlands.

p53 stimulates the transcription of a number of genes, such as MDM2, Waf1, and GADD45. We and others have shown previously that this activity of p53 can be inhibited by adenovirus type 2 or 12 large E1B proteins. Here we show that the adenovirus E1A proteins also can repress the stimulation of transcription by p53, both in transient transfections and in stably transfected cell lines. The inhibition by E1A occurs without a significant effect on the DNA-binding capacity of p53. Furthermore, the activity of a fusion protein containing the N- terminal part of p53 linked to the GAL4 DNA-binding domain can be suppressed by E1A. This indicates that E1A affects the transcription activation domain of p53, although tryptic phosphopeptide mapping revealed that the level of phosphorylation of this domain does not change significantly in E1A-expressing cell lines. Gel filtration studies, however, showed p53 to be present in complexes of increased molecular weight as a result of E1A expression. Apparently, E1A can cause increased homo- or hetero-oligomerization of p53, which might result in the inactivation of the transcription activation domain of p53. Additionally, we found that transfectants stably expressing E1A have lost the ability to arrest in G1 after DNA damage, indicating that E1A can abolish the normal biological function of p53.


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