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• W2009367000 abstract "To further define the structure and function of the domains in HIV-1 and SIV Tat proteins, chimeric Tat cDNA expression constructs were generated with crossover points at the carboxy-terminal end of the cysteine rich domain. The chimera containing the amino-terminal region of SIV and carboxy-terminal region of HIV exhibited activity similar to HIV-1 Tat and SIV Tat on both the HIV-1 and SIV LTRs. In contrast, the reciprocal chimera functioned poorly. As determined by the activity of carboxy-terminal truncation mutants, the region immediately downstream of the basic domain is critical for efficient transactivation by HIV-1 Tat, but not SIV Tat protein. In this report, we present a model for Tat domains based on NMR data and the known functional properties of Tat protein. According to our modeling two sites for protein :protein interactions are present in HIV-1 and SIV Tat proteins. Site I, which is presumably involved in cyclin T binding, is similar in both HIV-1 and SIV Tat proteins as well as in Tat chimeras. Site II, however appears structurally different in HIV-1 and SIV Tat models, although in both cases is comprised of amino and carboxy-terminal residues. Differences in Site II may thus account for the differential activities of HIV-1 and SIV Tat carboxy-terminal truncations. Site II in the poorly active chimera differs significantly from that found in HIV-1 and SIV Tat proteins. The two site structural model presented here may have important implications for the role of Tat in HIV pathogenesis and may provide insights for the design of Tat vaccines and targeted therapeutics." @default.
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• W2009367000 date "1998-12-01" @default.
• W2009367000 modified "2023-09-27" @default.
• W2009367000 title "Structure and function of HIV-1 and SIV Tat proteins based on carboxy-terminal truncations, chimeric Tat constructs, and NMR modeling" @default.
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• W2009367000 doi "https://doi.org/10.1016/s0753-3322(99)80019-5" @default.
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