Human T Cell Transcription Factor GATA-3 Stimulates HIV-1 Expression

Overview

Journal Nucleic Acids Res

Publisher Oxford University Press

Specialty Biochemistry

Date 1993 Jun 25

PMID 8332492

Citations 26

Authors

Z Yang

J D Engel

Affiliations

Soon will be listed here.

Abstract

A family of transcriptional activating proteins, the GATA factors, has been shown to bind to a consensus motif through a highly conserved C4 zinc finger DNA binding domain. One member of this multigene family, GATA-3, is most abundantly expressed in T lymphocytes, a cellular target for human immunodeficiency virus type 1 (HIV-1) infection and replication. In vitro DNase I footprinting analysis revealed six hGATA-3 binding sites in the U3 region (the transcriptional regulatory domain) of the HIV-1 LTR. Cotransfection of an hGATA-3 expression plasmid with a reporter plasmid whose transcription is directed by the HIV-1 LTR resulted in 6- to 10-fold stimulation of LTR-mediated transcription, whereas site specific mutation of these GATA sites resulted in virtual abrogation of the activation by hGATA-3. Further, deletion of the hGATA-3 transcriptional activation domain abolished GATA-dependent HIV-1 trans-activation, showing that the stimulation of viral transcription observed is a direct effect of cotransfected hGATA-3. Introduction of the HIV-1 plasmids in which the GATA sites have been mutated into human T lymphocytes also caused a significant reduction in LTR-mediated transcription at both the basal level and in (PHA- plus PMA-) stimulated T cells. These observations suggest that in addition to its normal role in T lymphocyte gene regulation, hGATA-3 may also play a significant role in HIV-1 transcriptional activation.

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