Binding of NF-kB to the HIV-1 LTR is not sufficient to induce HIV-1 LTR activity.

Abstract:

:Human immunodeficiency virus type 1 (HIV-1) spends a significant part of its life cycle as latent provirus in nonactivated cells. It induction requires mitogen stimulation. TPA treatment induces HIV-1 transcription by protein kinase C (PKC)-mediated activation of the cellular transcription factor NF-kB. PKC activation induces the dissociation of NF-kB from its inhibitor protein (IkB). The liberated NF-kB then binds to its proviral recognition sequence in the HIV-1 long terminal repeat (LTR) sequence. This step, however, is not sufficient to augment transcription. We demonstrate that NF-kB-mediated HIV-1 LTR activation is regulated by an additional event that is not dependent on IkB. A further phosphorylation event is proposed, since this step could be blocked by an inhibitor of a phospholipase C (PLC) type reaction. This inhibitor precludes the formation of diacylglycerols, which are required for activation of PKC isoenzymes. As an alternative pathway that is not dependent on PLC reactions, high-level transcription from the HIV-1 LTR is shown to require binding of both NF-kB and TAT.

authors

Doppler C,Schalasta G,Amtmann E,Sauer G

doi

10.1089/aid.1992.8.245

subject

Has Abstract

pub_date

1992-02-01 00:00:00

pages

245-52

issue

2

eissn

0889-2229

issn

1931-8405

journal_volume

8

pub_type

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