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. 1994 Apr;14(4):2651–2663. doi: 10.1128/mcb.14.4.2651

Stimulation of polyomavirus DNA replication by wild-type p53 through the DNA-binding site.

T Kanda 1, K Segawa 1, N Ohuchi 1, S Mori 1, Y Ito 1
PMCID: PMC358632  PMID: 8139565

Abstract

The tumor suppressor p53 possesses characteristics of a transcription factor; it binds to specific DNA sequences and activates transcription from various promoters. Here we found that murine wild-type p53 stimulated not only transcription but also polyomavirus (Py) DNA replication in a sequence-dependent manner. Oncogenic mutant p53, lacking the DNA-binding activity, showed no stimulation of Py DNA replication. Deletion of the N-terminal acidic transactivation domain of wild-type p53, which completely eliminated the ability to stimulate transcription, only impaired the function to stimulate Py DNA replication. The replication-stimulating activity of wild-type p53 was impaired by the deletion of the C-terminal oligomerization domain as well, without affecting the ability to stimulate transcription. The region responsible for the sequence-specific DNA-binding activity mapped to the central portion of the p53 molecule has a minimal activity. The results indicate that both the N-terminal and the C-terminal regions significantly contribute to the p53-mediated stimulation of Py DNA replication.

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