NDLI: Bromodomain analysis of Brd2-dependent transcriptional activation of cyclin A 1

Content Provider	PubMed Central
Author	Sinha, Anupama Faller, Douglas V. Denis, Gerald V.
Copyright Year	2005
Abstract	Cyclin A is regulated primarily through transcription control during the mammalian cell cycle. A dual mechanism of cyclin A transcriptional repression involves, on the one hand, promoter-bound inhibitory complexes of E2F transcription factors and RB (retinoblastoma) family proteins, and on the other, chromatin-directed histone deacetylase activity that is recruited to the cyclin A promoter early in the cell cycle in association with these RB proteins. This dual regulation maintains transcriptional silence of the cyclin A locus until its transcription is required in S-phase. At that time, RB family members dissociate from E2F proteins and nucleosomal restructuring of the locus takes place, to permit transcriptional activation and resultant S-phase progression to proceed. We have identified a double bromo-domain-containing protein Brd2, which exhibits apparent ‘scaffold’ or transcriptional adapter functions and mediates recruitment of both E2F transcription factors and chromatin-remodelling activity to the cyclin A promoter. We have shown previously that Brd2-containing nuclear, multiprotein complexes contain E2F-1 and -2. In the present study, we show that, in S-phase, they also contain histone H4-directed acetylase activity. Overexpression of Brd2 in fibroblasts accelerates the cell cycle through increased expression of cyclin A and its associated cyclin-dependent kinase activity. Chromatin immunoprecipitation studies show that Brd2 is physically present at the cyclin A promoter and its overexpression promotes increased histone H4 acetylation at the promoter as it becomes transcriptionally active, suggesting a new model for the dual regulation of cyclin A.
Related Links	http://dx.doi.org/10.1042/bj20041793
Ending Page	269
Page Count	13
Starting Page	257
File Format	PDF
ISSN	02646021
e-ISSN	14708728
Journal	Biochemical Journal
Issue Number	Pt 1
Volume Number	387
Language	English
Publisher	Portland Press Ltd.
Publisher Date	2005-04-01
Access Restriction	Open
Rights Holder	Portland Press Ltd.
Subject Keyword	Cell Biology Biochemistry Molecular Biology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Molecular Biology Biochemistry

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