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. 1996 Oct 29;93(22):12376–12381. doi: 10.1073/pnas.93.22.12376

NF-kappa B homodimer binding within the HIV-1 initiator region and interactions with TFII-I.

M A Montano 1, K Kripke 1, C D Norina 1, P Achacoso 1, L A Herzenberg 1, A L Roy 1, G P Nolan 1
PMCID: PMC37999  PMID: 8901589

Abstract

We show that the binding of Rel p50 and p52 homodimers at sites within the transcriptional initiation region of HIV-1 provides for their ability to interact with other proteins that bind the initiator. The binding of one such protein, the initiator protein TFII-I, to the initiation region of HIV-1 is augmented in the presence of Rel p50 and Rel p52 homodimers. Consistent with this, in vitro Rel homodimers potentiate HIV-1 transcription in a manner dependent upon TFII-I. The findings suggest that Rel dimers may regulate HIV-1 transcription in two ways. First, through binding at the kappa B enhancer sites at (-104 to -80), NF-kappa B p50:p65 participates in classical transcriptional activation. Second, Rel dimers such as p50 or p52 might bind at initiator sequences to regulate the de novo binding of components of certain preinitiation complexes. These findings, and the existence of Rel binding sites at the initiators of other genes, suggest roles for Rel proteins in early events determining transcriptional control.

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