The tumor suppressor p53 associates with gene coding regions and co-traverses with elongating RNA polymerase II in an in vivo model.

Abstract:

:Sequence-specific transcriptional regulators function by stably binding cognate DNA sequences followed by recruitment of both general and specialized factors to target gene promoters. The tumor suppressor p53 mediates its anti-oncogenic effect on cells by functioning as a sequence-specific regulator. p53 employs a secondary mechanism to suppress tumor formation by permeabilizing the outer mitochondrial membrane, thereby releasing pro-apoptotic factors. Here, we report a potential third biological function of p53: as a transcriptional elongation factor. Using chromatin immunoprecipitation, we demonstrate that human p53 robustly associates with RNA polymerase II (Pol II), but neither Pol I- nor Pol III-transcribed regions in the budding yeast, Saccharomyces cerevisiae. p53's association with open reading frames is mediated by its physical interaction with elongating Pol II, with which p53 travels in vivo and co-immunoprecipitates in vitro. When similarly expressed, the potent acidic activator VP16 cannot be cross-linked to Pol II coding regions. p53 levels comparable to those found in induced mammalian cells confer synthetic sickness or lethality in combination with deletions in genes encoding transcription elongation factors; p53 likewise confers hypersensitivity to the anti-elongation drug 6-azauracil. Collectively, our results indicate that p53 can physically interact with the transcription elongation complex and influence transcription elongation, and open up new avenues of investigation in mammalian cells.

journal_name

Oncogene

journal_title

Oncogene

authors

Balakrishnan SK,Gross DS

doi

10.1038/sj.onc.1210935

subject

Has Abstract

pub_date

2008-04-24 00:00:00

pages

2661-72

issue

19

eissn

0950-9232

issn

1476-5594

pii

1210935

journal_volume

27

pub_type

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