Involvement of chromatin and histone deacetylation in SV40T antigen transcription regulation
- Ester Valls 1
- Noemí Blanco-García 1
- Naiara Aquizu 1
- David Piedra 2
- Conchi Estarás 1
- Xavier de la Cruz 2
- María Ángeles Martínez Balbás 1
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1
Instituto de Biología Molecular de Barcelona
info
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2
IRB Barcelona - Institute for Research in Biomedicine
info
IRB Barcelona - Institute for Research in Biomedicine
Barcelona, España
Año de publicación: 2007
Volumen: 6
Páginas: 1958-1968
Tipo: Artículo
Resumen
Simian Virus 40 (SV40) large T antigen (T Ag) is amultifunctional viral oncoprotein that regulatesviral and cellular transcriptional activity. However,the mechanisms by which such regulation occursremain unclear. Here we show that T antigenrepresses CBP-mediated transcriptional activity.This repression is concomitant with histone H3deacetylation and is TSA sensitive. Moreover,our results demonstrate that T antigen interactswith HDAC1 in vitro in an Rb-independent manner.In addition, the overexpression of HDAC1 cooperates with T antigen to antagonize CBP transactivation function and correlates with chromatindeacetylation of the TK promoter. Finally, decreasing HDAC1 levels with small interfering RNA (siRNA)partially abolishes T antigen-induced repression.These findings highlight the importance of thehistone acetylation/deacetylation balance in thecellular transformation mediated by oncoviralproteins.
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