Abstract
HIV-1 gene expression is regulated by the interplay of transcription factors with multiple binding motifs present within the U3, R and U5 regions of the long terminal repeat (LTR). Here we report novel DNA binding complexes (termed 9a, 9b and 9c) between nuclear proteins from T-lymphoid and non-T-lymphoid cells and a region of the U3 LTR between nucleotides (nts) −320 to −281 in the HIV strain HXB2. Complex 9b bound a motif predicted to bind E-box or c-Myb proteins and a partially overlapping dyad symmetrical motif, and included basic helix-loop-helix proteins (E12, E47 or ITF-1) but surprisingly not c-Myb. Complex 9c, which bound to a pair of GATA sites, included GATA-3 and GATA-4 in Jurkat and MT-2 cells, respectively. We also demonstrate that the c-Myb/E-box and GATA sites form a bipartite motif required for the formation of complex 9a. Transient transfection experiments with T cells revealed that in the context of a minichromosome assembled full-length LTR, mutation of region −320 to −281 increased basal and PMA-stimulated LTR activity. These findings suggest that this region is an important component of the HIV-1 LTR required for response to different cellular transcription factors.
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Pereira, L.A., Churchill, M.J., Elefanty, A.G. et al. Characterization of interactions between transcription factors and a regulatory region spanning nt −320 to −281 of the HIV-1 LTR in T-lymphoid and non-T-lymphoid cells. J Biomed Sci 9, 68–81 (2002). https://doi.org/10.1007/BF02256580
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DOI: https://doi.org/10.1007/BF02256580