Abstract
The expression of human T-cell leukemia virus type 1 (HTLV-1) is activated by interaction of a viral transactivator protein, Tax, and cellular transcription factor, CREB (cyclic AMP response element binding protein), which bind to a 21-bp enhancer in the long terminal repeats (LTR). THP (Tax-helping protein) was previously determined to enhance the transactivation by Tax protein. Here we report novel forms of the human homolog of a member of the Gli oncogene family, Gli2 (also termed Gli2/THP), an extended form of a zinc finger protein, THP, which was described previously. Four possible isoforms (hGli2 alpha, beta, gamma, and delta) are formed by combinations of two independent alternative splicings, and all the isoforms could bind to a DNA motif, TRE2S, in the LTR. The longer isoforms, alpha and beta, were abundantly expressed in various cell lines including HTLV-1-infected T-cell lines. Fusion proteins of the hGli2 isoforms with the DNA-binding domain of Gal4 activated transcription when the reporter contained a Gal4-binding site and one copy of the 21-bp sequence, to which CREB binds. This activation was observed only in the presence of Tax. The 21-bp sequence in the reporter was also essential for the activation. These resu...Continue Reading
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