JVI Figure table search 04
Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrowReprints and Permissions
Right arrow Copyright Information
Right arrow Books from ASM Press
Right arrow MicrobeWorld
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Zhang, W.
Right arrow Articles by Lairmore, M. D.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Zhang, W.
Right arrow Articles by Lairmore, M. D.

 Previous Article  |  Next Article 

Journal of Virology, December 2000, p. 11270-11277, Vol. 74, No. 23
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Human T-Lymphotropic Virus Type 1 p30II Functions as a Transcription Factor and Differentially Modulates CREB-Responsive Promoters

Weiqing Zhang,1 John W. Nisbet,1 Joshua T. Bartoe,1 Wei Ding,1 and Michael D. Lairmore1,2,3,*

Center for Retrovirus Research and Department of Veterinary Biosciences,1 Comprehensive Cancer Center, The Arthur James Cancer Hospital and Research Institute,2 and Department of Molecular Virology, Immunology, and Medical Genetics,3 The Ohio State University, Columbus, Ohio 43210

Received 3 July 2000/Accepted 1 September 2000

Human T-lymphotropic virus type 1 (HTLV-1), a complex retrovirus, causes adult T-cell lymphoma/leukemia and is linked to a variety of immune-mediated disorders. The roles of proteins encoded in the pX open reading frame (ORF) II gene region in HTLV-1 replication or in mediating virus-associated diseases remain to be defined. A nucleus-localizing 30-kDa protein, p30II, encoded within pX ORF II has limited homology with the POU family of transcription factors. Recently, we reported that selected mutations in pX ORF II diminish the ability of HTLV-1 to maintain high viral loads in infected rabbits. Herein we have tested the transcriptional ability of p30II in mammalian cells by using yeast Gal4 fusion protein vectors and transfection of luciferase reporter genes driven by CREB-responsive promoters. p30II as a Gal4 DNA-binding domain (DBD) fusion protein transactivates Gal4-driven luciferase reporter gene activity up to 25-fold in 293 and HeLa-tat cells. We confirmed nuclear localization of p30II and demonstrate dose-dependent binding of p30II-Gal4(DBD) to Gal4 DNA-binding sites. The transcriptional activity of p30II-Gal4(DBD) was independent of TATA box flanking sequences, as shown by using two different Gal4 reporter systems. Studies of selected p30II mutants indicated that domains that mediate transcription are restricted to a central core region of the protein between amino acids 62 and 220. Transfection of a p30II-expressing plasmid repressed cellular CRE-driven reporter gene activity, with or without Tax expression. In contrast, p30II at lower concentrations enhanced HTLV-1 long terminal repeat-driven reporter gene activity independent of Tax expression. These data are the first to demonstrate a transcriptional function for p30II and suggest a mechanism by which this nuclear protein may influence HTLV-1 replication or cellular gene expression in vivo.

* Corresponding author. Mailing address: Department of Veterinary Biosciences, The Ohio State University, 1925 Coffey Rd., Columbus, OH 43210-1093. Phone: (614) 292-4819. Fax: (614) 292-6473. E-mail: lairmore.1{at}osu.edu.

Journal of Virology, December 2000, p. 11270-11277, Vol. 74, No. 23
0022-538X/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


This article has been cited by other articles:



Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
J. Bacteriol. Mol. Cell. Biol. Microbiol. Mol. Biol. Rev.
Clin. Vaccine Immunol. ALL ASM JOURNALS

Copyright © 2000 by the American Society for Microbiology. All rights reserved.