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. 1990 Aug;10(8):4192–4201. doi: 10.1128/mcb.10.8.4192

A 36-kilodalton cellular transcription factor mediates an indirect interaction of human T-cell leukemia/lymphoma virus type I TAX1 with a responsive element in the viral long terminal repeat.

S J Marriott 1, P F Lindholm 1, K M Brown 1, S D Gitlin 1, J F Duvall 1, M F Radonovich 1, J N Brady 1
PMCID: PMC360951  PMID: 2370863

Abstract

The human T-cell leukemia/lymphoma virus type I (HTLV-I) trans activator, TAX1, interacts indirectly with a TAX1-responsive element, TRE-2, located at positions -117 to -163 in the viral long terminal repeat. This report describes the characterization of a 36-kilodalton (kDa) protein identified in HeLa nuclear extract which mediates the interaction of TAX1 with TRE-2. Purification of the protein was achieved by zinc chelate chromatography and preparative sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The renatured 36-kDa protein bound specifically to a TRE-2 oligonucleotide but not to nonfunctional base substitution mutant probes in a gel retardation assay. Renatured proteins of differing molecular weights were unable to form this complex. In addition, the 36-kDa protein specifically activated transcription from the HTLV-I promoter in vitro. Purified TAX1 protein formed a complex with the TRE-2 oligonucleotide in the presence of the 36-kDa protein, suggesting that indirect interaction of TAX1 with the viral long terminal repeat may be one of the mechanisms by which HTLV-I transcription is regulated.

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