Proc Natl Acad Sci U S A. 1991 Dec 15;88(24):11445-9.

Interaction of the human T-cell lymphotrophic virus type I (HTLV-I) transcriptional activator Tax with cellular factors that bind specifically to the 21-base-pair repeats in the HTLV-I enhancer.

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Department of Medicine, Case Western Reserve University School of Medicine, Cleveland, OH 44106.

Abstract

The human T-cell lymphotrophic virus type I (HTLV-I) Tax protein activates transcription from three 21-base-pair (bp) repeat sequences in the viral enhancer. Using gel electrophoretic mobility-shift assays, we now show that Tax interacts directly with the nuclear proteins, Tax activation factors (TAFs), that bind the 21-bp repeats. This interaction is demonstrated by decreased electrophoretic mobilities of the TAFs-21-bp-repeats complexes upon supply of Tax exogenously. Formation of the TAFs-21-bp-repeats and Tax-TAFs-21-bp-repeats complexes correlates with in vivo transactivation by Tax. Furthermore, interaction of Tax with TAFs enhances their binding to the 21-bp repeats. These data indicate that trans-activation by Tax is most likely mediated by interaction of Tax with TAFs.

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PMCID:: PMC53152

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Proc Natl Acad Sci U S A. 1991 Dec 15 ;88(24):11445-9.

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Interaction of the human T-cell lymphotrophic virus type I (HTLV-I) transcriptional activator Tax with cellular factors that bind specifically to the 21-base-pair repeats in the HTLV-I enhancer.

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