p300 provides a corepressor function by cooperating with YY1 and HDAC3 to repress c-Myc.

Abstract:

:We showed earlier that p300/CBP plays an important role in G1 progression by negatively regulating c-Myc and thereby preventing premature G1 exit. Here, we have studied the mechanism by which p300 represses c-Myc and show that in quiescent cells p300 cooperates with histone deacetylase 3 (HDAC3) to repress transcription. p300 and HDAC3 are recruited to the upstream YY1-binding site of the c-Myc promoter resulting in chromatin deacetylation and repression of c-Myc transcription. Consistent with this, ablation of p300, YY1 or HDAC3 expression results in chromatin acetylation and induction of c-Myc. These three proteins exist as a complex in vivo and form a multiprotein complex with the YY1-binding site in vitro. The C-terminal region of p300 is both necessary and sufficient for the repression of c-Myc. These and other results suggest that in quiescent cells the C-terminal region of p300 provides corepressor function and facilitates the recruitment of p300 and HDAC3 to the YY1-binding site and represses the c-Myc promoter. This corepressor function of p300 prevents the inappropriate induction of c-Myc and S phase.

journal_name

Oncogene

journal_title

Oncogene

authors

Sankar N,Baluchamy S,Kadeppagari RK,Singhal G,Weitzman S,Thimmapaya B

doi

10.1038/onc.2008.181

subject

Has Abstract

pub_date

2008-09-25 00:00:00

pages

5717-28

issue

43

eissn

0950-9232

issn

1476-5594

pii

onc2008181

journal_volume

27

pub_type

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