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Journal of Virology, October 2005, p. 13180-13185, Vol. 79, No. 20
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.20.13180-13185.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Kaposi's Sarcoma-Associated Herpesvirus Virion-Induced Transcription Activation of the ORF50 Immediate-Early Promoter

Fang Lu, Latasha Day, and Paul M. Lieberman*

The Wistar Institute, Philadelphia, Pennsylvania 19104

Received 25 February 2005/ Accepted 14 July 2005

Lytic cycle reactivation of Kaposi's sarcoma-associated herpesvirus (KSHV) can be initiated by transcription activation of the ORF50 immediate-early (IE) gene promoter (ORF50p). We provide evidence that KSHV virions stimulate transcription of ORF50p. Virion activation was resistant to UV inactivation and cycloheximide treatment. The virion-responsive element was mapped to core promoter region –150 to + 1 relative to the ORF50 initiation codon. Electrophoretic mobility shift assays and chromatin immunoprecipitation suggest that KSHV virions indirectly alter the protein composition and chromatin modifications at ORF50p. These data suggest that KSHV virions possess an IE trans-inducing function similar to that observed in alpha- and betaherpesviruses.

* Corresponding author. Mailing address: The Wistar Institute, 3601 Spruce St., Philadelphia, PA 19104. Phone: (215) 898-9491. Fax: (215) 989-0663. E-mail: Lieberman{at}wistar.upenn.edu.

Journal of Virology, October 2005, p. 13180-13185, Vol. 79, No. 20
0022-538X/05/$08.00+0     doi:10.1128/JVI.79.20.13180-13185.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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