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Journal of Virology, June 2001, p. 5391-5397, Vol. 75, No. 11
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.11.5391-5397.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Viral and Cellular Factors That Target the Promyelocytic Leukemia Oncogenic Domains Strongly Activate a Glucocorticoid-Responsive Promoter

Sandra Wienzek and Matthias Dobbelstein*

Institut für Virologie, Philipps-Universität Marburg, 35037 Marburg, Germany

Received 11 August 2000/Accepted 6 March 2001

Promyelocytic leukemia (PML) oncogenic domains (PODs) accumulate the transcriptional cofactor named CREB binding protein (CBP) and have been suggested to function as centers of transcription. Transcriptional activation by nuclear hormones, such as glucocorticoids, is augmented by the key constituent of PODs, the PML protein, and decreased by the POD-associated Tax protein of human T-cell leukemia virus type 1 (HTLV-1). This led to the hypothesis that intact PODs might play a positive role in the activation of these promoters. We report here that transiently expressed E4orf3 protein of adenovirus type 5, immediate-early protein 1 of human cytomegalovirus, and the PML-retinoic acid receptor fusion protein from leukemia cells each redistribute CBP within the nucleus. However, unlike the Tax protein of HTLV-1, these factors did not inhibit a glucocorticoid-inducible promoter but strongly enhanced its activity. Thus, at least glucocorticoid-induced transcription does not depend on POD integrity.

* Corresponding author. Mailing address: Institut für Virologie, Philipps-Universität, Robert Koch Str. 17, 35037 Marburg, Germany. Phone: 49 6421 28 64318. Fax: 49 6421 28 68962. E-mail: dobbelst{at}mailer.uni-marburg.de.

Journal of Virology, June 2001, p. 5391-5397, Vol. 75, No. 11
0022-538X/01/$04.00+0   DOI: 10.1128/JVI.75.11.5391-5397.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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