Nucleic Acids Research, 2001, Vol. 29, No. 15 3131-3136
© 2001 Oxford University Press
The histone deacetylase HDAC3 targets RbAp48 to the retinoblastoma protein
Laboratoire de Biologie Moléculaire Eucaryote, UMR 5099 CNRS, 118 Route de Narbonne, F-31062 Toulouse Cedex, France and 1Institut André Lwoff, UPR 9079 CNRS, Villejuif, France
The product of the retinoblastoma susceptibility gene, the Rb protein, functions partly through transcriptional repression of E2F-regulated genes. Repression by Rb is mediated, at least in part, by a histone deacetylase complex, whose enzymatic activity relies on HDAC1, HDAC2 or HDAC3. Recently, we have shown that the Rb-associated histone deacetylase complex contains RbAp48 protein, which interacts with HDAC1 and HDAC2. RbAp48 could favour the deacetylation of histones since it binds directly to histone H4. In agreement with that, we show that transcriptional repression of E2F activity requires the presence of RbAp48. HDAC3 was thought not to interact with RbAp48. However, we found that it shared with HDAC1 the ability to favour the recruitment of RbAp48 to Rb. This latter effect was unlikely to be due to activation of Rb function, since HDAC3 did not increase Rb–E2F1 interaction. Rather, we found, surprisingly, that HDAC3 could physically interact with RbAp48 both in vitro and in living cells. Taken together, our data suggest a model in which Rb mediates the recruitment to E2F-regulating promoters of a repressive complex containing either HDAC1, HDAC2 or HDAC3 and the histone-binding protein RbAp48.
* To whom correspondence should be addressed. Tel: +33 5 61 33 59 15; Fax: +33 5 61 33 58 86; Email: trouche{at}ibcg.biotoul.fr
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