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Molecular and Cellular Biology, July 2000, p. 4970-4978, Vol. 20, No. 14
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Histone Binding Protein RbAp48 Interacts with a Complex of CREB Binding Protein and Phosphorylated CREB

Qinghong Zhang, Ngan Vo, and Richard H. Goodman*

Vollum Institute, Oregon Health Sciences University, Portland, Oregon

Received 7 December 1999/Returned for modification 13 January 2000/Accepted 24 April 2000

A CREB-CREB binding protein (CBP) complex was used as bait to screen a mouse embryo cDNA library in yeast. One of the strongest interactions identified the histone binding protein RbAp48. RbAp48 also interacted weakly with CBP alone but did not interact with phosphorylated or nonphosphorylated CREB. CBP (or its homologue p300) from HeLa cell nuclear extracts coimmunoprecipitated with RbAp48 and its homologue RbAp46 and bound to a glutathione S-transferase-RbAp48 fusion protein. This interaction was stimulated by the addition of phosphorylated CREB and allowed the association of core histones and mononucleosomes in an acetylation-dependent manner. RbAp48 lowered the Km of CBP histone acetylase activity and facilitated p300-mediated in vitro transcription of a chromatinized template in the presence of acetylcoenzyme A. These data indicate that the association of phosphorylated CREB with CBP promotes the binding of RbAp48 and its homologue RbAp46, allowing the formation of a complex that facilitates histone acetylation during transcriptional activation.

* Corresponding author. Mailing address: Vollum Institute, Oregon Health Sciences University, 3181 S.W. Sam Jackson Park Rd., Portland, OR 97201. Phone: (503) 494-5078. Fax: (503) 494-4353. E-mail: goodmanr{at}ohsu.edu.

Molecular and Cellular Biology, July 2000, p. 4970-4978, Vol. 20, No. 14
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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