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Journal of Virology, March 2000, p. 2169-2177, Vol. 74, No. 5
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Identification of Poly(ADP-Ribose) Polymerase as a Transcriptional Coactivator of the Human T-Cell Leukemia Virus Type 1 Tax Protein

Mark G. Anderson,1,* Kirsten E. S. Scoggin,1,dagger Cynthia M. Simbulan-Rosenthal,2 and Jennifer A. Steadman1

Institute of Molecular Medicine and Genetics, Program in Gene Regulation, Medical College of Georgia, Augusta, Georgia 30912,1 and Department of Biochemistry and Molecular Biology, Georgetown University School of Medicine, Washington, D.C. 200072

Received 24 June 1999/Accepted 3 December 1999

Human T-cell leukemia virus type 1 (HTLV-1) encodes a transcriptional activator, Tax, whose activity is believed to contribute significantly to cellular transformation. Tax stimulates transcription from the proviral promoter as well as from promoters for a variety of cellular genes. The mechanism through which Tax communicates to the general transcription factors and RNA polymerase II has not been completely determined. We investigated whether Tax could function directly through the general transcription factors and RNA polymerase II or if other intermediary factors or coactivators were required. Our results show that a system consisting of purified recombinant TFIIA, TFIIB, TFIIE, TFIIF, CREB, and Tax, along with highly purified RNA polymerase II, affinity-purified epitope-tagged TFIID, and semipurified TFIIH, supports basal transcription of the HTLV-1 promoter but is not responsive to Tax. Two additional activities were required for Tax to stimulate transcription. We demonstrate that one of these activities is poly(ADP-ribose) polymerase (PARP), a molecule that has been previously identified to be the transcriptional coactivator PC1. PARP functions as a coactivator in our assays at molar concentrations approximately equal to those of the DNA and equal to or less than those of the transcription factors in the assay. We further demonstrate that PARP stimulates Tax-activated transcription in vivo, demonstrating that this biochemical approach has functionally identified a novel target for the retroviral transcriptional activator Tax.

* Corresponding author. Mailing address: Institute of Molecular Medicine and Genetics, Medical College of Georgia, 1120 15th St., Augusta, GA 30912. Phone: (706) 721-8758. Fax: (706) 721-8752. E-mail: manderson{at}immag.mcg.edu.

dagger Present address: Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, CO 80523.

Journal of Virology, March 2000, p. 2169-2177, Vol. 74, No. 5
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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