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Modulation of host cell nuclear proteins that bind to HIV-1 trans-activation-responsive element RNA by phorbol ester.

Abstract：

:The trans-activation-responsive (TAR) element located within the 5' untranslated region of HIV-1 mRNA is the cis-responsive element for Tat, the viral trans-activator protein. Several TAR RNA binding proteins (TRBPs) have been identified in the nuclear extract from HeLa cells as cellular factors required for a full Tat-mediated trans-activation. In this study, we have tried to identify TRBPs in human T cell line (MOLT-4) persistently infected with HIV-1. Nuclear extract from the infected MOLT-4 cells was analyzed by gel-retardation and uv cross-linking assays with radiolabeled TAR RNA probe. Two major complexes of TAR RNA with some cellular proteins were detected in the gel-retardation assay. As the components of these complexes, at least five TRBPs (p30, p37, p46, p50, and p56) showing specific binding to the TAR RNA were detected in the uv cross-linking assay. We also observed that the detectable levels of p37 and p50 in the infected MOLT-4 cells were greatly reduced after phorbol ester (TPA) treatment under the condition of which HIV-1 gene expression was increased by about fivefold. These results suggest that the modulation of TRBPs by some mitogenic stimuli such as TPA might have a role in the trans-activation of HIV-1 gene expression in vivo.

journal_name

Virology

journal_title

Virology

authors

Masuda T,Harada S

doi

10.1006/viro.1993.1091

subject

Has Abstract

pub_date

1993-02-01 00:00:00

pages

696-700

issue

2

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(83)71091-3

journal_volume

192

pub_type

杂志文章

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