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- W2015773923 abstract "The human T-cell leukemia virus type-1 (HTLV-I)-encoded Tax protein enhances viral gene transcription through interaction with three repeated DNA elements located in the viral promoter. These elements, called viral CREs, are composed of an off-consensus eight base-pair cyclic AMP response element (CRE), immediately flanked by sequences that are rich in guanine and cytosine residues. Recent biochemical experiments have demonstrated that in the presence of the cellular protein CREB, Tax directly binds the viral CRE G+C-rich sequences via interaction with the minor groove. To determine the functional significance of the Tax-DNA interaction, we synthesized minor groove-binding pyrrole-imidazole polyamides which bind specifically to the G+C-rich sequences in the viral CREs. At concentrations where the polyamides specifically protect the G+C-rich sequences from MPE:Fe cleavage, the polyamides block the Tax-DNA interaction. At precisely these same concentrations, the polyamides specifically inhibit Tax transactivation in vitro, without altering CREB-activated transcription or basal transcription from the same promoter. Together, these data provide strong evidence that Tax-viral CRE interaction is essential for Tax function in vitro, and suggest that targeted disruption of the Tax-DNA minor groove interaction with polyamides may provide a novel approach for inhibiting viral replication in vivo." @default.
- W2015773923 created "2016-06-24" @default.
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- W2015773923 date "1999-08-01" @default.
- W2015773923 modified "2023-10-13" @default.
- W2015773923 title "The tax protein-DNA interaction is essential for HTLV-I transactivation in Vitro" @default.
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- W2015773923 doi "https://doi.org/10.1006/jmbi.1999.2969" @default.
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