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Journal of Virology, August 1999, p. 6551-6558, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

The Epstein-Barr Virus BZLF1 Protein Interacts Physically and Functionally with the Histone Acetylase CREB-Binding Protein

Amy L. Adamson1 and Shannon Kenney1,2,*

Lineberger Comprehensive Cancer Center1 and Department of Medicine and Department of Microbiology,2 University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7295

Received 14 December 1998/Accepted 30 April 1999

The Epstein-Barr virus (EBV) immediate-early protein BZLF1 (Z) is a key regulator of the EBV latent-to-lytic switch. Z is a transcriptional activator which induces EBV early gene expression. We demonstrate here that Z interacts with CREB-binding protein (CBP), a histone acetylase and transcriptional coactivator. This interaction requires the amino-terminal region of CBP as well as the transactivation and leucine zipper domains of Z. We show that CBP enhances Z-mediated transactivation of EBV early promoters, in reporter gene assays and in the context of the endogenous genome. We also demonstrate that Z decreases CREB transactivation function and that this inhibitory effect is reversed by overexpression of CBP. We show that Z also interacts directly with CREB. However, mutational analysis indicates that Z inhibition of CREB activity requires the direct interaction between Z and CBP but not the direct interaction between Z and CREB. We propose that Z interacts with CBP to enhance viral early gene transcription. In addition, the Z-CBP interaction may control host cellular transcription factor activity through competition for limiting amounts of cellular CBP.

* Corresponding author. Mailing address: Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7295. Phone: (919) 966-1248. Fax: (919) 966-8212. E-mail: shann{at}med.unc.edu.

Journal of Virology, August 1999, p. 6551-6558, Vol. 73, No. 8
0022-538X/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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