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Science 1 July 1988:
Vol. 241. no. 4861, pp. 89 - 92
DOI: 10.1126/science.2838905
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Articles

Science, Vol 241, Issue 4861, 89-92
Copyright © 1988 by American Association for the Advancement of Science

articles

Cellular transcription factors and regulation of IL-2 receptor gene expression by HTLV-I tax gene product

S Ruben, H Poteat, TH Tan, K Kawakami, R Roeder, W Haseltine, and CA Rosen

Department of Molecular Oncology, Roche Institute of Molecular Biology, Nutley, NJ 07110.

Expression of the interleukin-2 receptor (IL-2R alpha) gene is activated by the transcriptional activator protein, Tax (previously referred to as the tat gene product), encoded by the human T-cell leukemia virus (HTLV-I). Multiple protein binding sites for specific DNA-protein interactions were identified over the upstream IL-2R alpha transcriptional regulatory sequences. However, only one region, which includes the sequence motif GGGGAATCTCCC, was required for activation by both the tax gene product and mitogenic stimulation. Remarkably, this sequence also bound the nuclear factor NF kappa B, which is important for induction of kappa-immunoglobulin gene expression. A model is presented whereby regulation of cellular gene expression by the HTLV-I tax gene product occurs via an indirect mechanism that may involve a post-translational modification of preexistent cellular transcription factors.


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