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The mammalian transcriptional repressor RBP (CBF1) targets TFIID and TFIIA to prevent activated transcription.

Abstract：

:RBP is a cellular protein that functions as a transcriptional repressor in mammalian cells. RBP has elicited great interest lately because of its established roles in regulating gene expression, in Drosophila and mouse development, and as a component of the Notch signal transduction pathway. This report focuses on the mechanism by which RBP represses transcription and thereby regulates expression of a relatively simple, but natural, promoter. The results show that, irrespective of the close proximity between RBP and other transcription factors bound to the promoter, RBP does not occlude binding by these other transcription factors. Instead, RBP interacts with two transcriptional coactivators: dTAFII110, a subunit of TFIID, and TFIIA to repress transcription. The domain of dTAFII110 targeted by RBP is the same domain that interacts with TFIIA, but is disparate from the domain that interacts with Sp1. Repression can be thwarted when stable transcription preinitiation complexes are formed before RBP addition, suggesting that RBP interaction with TFIIA and TFIID perturbs optimal interactions between these coactivators. Consistent with this, interaction between RBP and TFIIA precludes interaction with dTAFII110. This is the first report of a repressor specifically targeting these two coactivators to subvert activated transcription.

journal_name

Genes Dev

journal_title

Genes & development

authors

Olave I,Reinberg D,Vales LD

doi

10.1101/gad.12.11.1621

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

1621-37

issue

11

eissn

0890-9369

issn

1549-5477

journal_volume

12

pub_type

杂志文章

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